The Alliance System and the New Imperialism essays

The Alliance System and the New Imperialism expositions During the nineteenth and twentieth century a bounty of progress was happening inside the world regarding the holding and authoritative of union frameworks. France would rapidly interweave itself with various nations so as to structure unions to offer a type of security, quality, and riches for the nations in the partnership just as themselves. Simultaneously, there was a race for the realm, which would pick up fuel through expansionism of different realms. Also, significant colonialist exercises would happen. Through dread and worry for security, quality, and riches frontier property would increment. The blend of these components and the official of the nations through partnerships would in the long run help lead to the singular nations contribution in World War I (WWI) and the thinking France had a few distinct unions with different nations. France was a incredible partner and had the financial, political, and military qualities that demonstrated helpful in the fight against Germany and Austria-Hungary. France indeed, even had a mystery union with Italy that prompted Italy supporting France in the war against Germany and Austria-Hungary. There were different unions like the Franco-Russian Alliance of 1892 this understanding was framed with Russia. In the Franco-Russian understanding, if Germany or its partner Italy were to assault France, Russia would go to the guide and safeguard France. The equivalent thing applies to Russia if the situation happened for them. The following understanding was the Entente Cordiale of 1904, which assisted with closure struggle between Great Britain and France. This understanding not the slightest bit made Incredible Britain or France a coalition with one another, or power Great Britain to submit backing to Russia. This was a greater amount of an understanding than genuine formal partnership; in any case, the Triple Entente of 1907 changed the first union of the Entente Cordiale of 1904 and included Russia. Presently they were the Triple Understanding and remained in opposi... <!

Topman marketing mix free essay sample

The item as of late bought is a shirt from the retailer Topman; the shirt is of average quality for a mass-created thing the item doesn’t have a long life because of changes in style which is reflected in the cost. Topman have a wide range of extents inside stores to suit for their objective market. â€Å"Topman guarantee that there is stock that is regular and pattern drove, just as continually offering a nuts and bolts extend. With each scope of stock they discharge, they have a variety of various examples, hues and prints which again are seasonal† (scribd,2013) Topman offer moderate valuing procedures that suits their intended interest groups low dispensable financial plans, one principle crowd is understudies who have restricted spending plans. Contrasted with different brands Topman’s evaluating will in general be sensible for the things its sells by having the lower costs it permits its clients to get the appearance of high design houses for significantly less. We will compose a custom article test on Topman showcasing blend or on the other hand any comparative subject explicitly for you Don't WasteYour Time Recruit WRITER Just 13.90/page Topman likewise has more expensive things which are commonly sold on the web or in lead stores this permits them to differing in to different crowds who have increasingly dispensable spending plans. Topman sells through are scope of conveyance channels, including their own stores, either remain solitary or joined forces with Topshop. Topman likewise utilizes concession outlets in retail chain, for example, Debenhams and Selfridges Co. Topman is likewise accessible online through a global site, the webpage stocks a scope of item some of which are restrictive to the site. The utopia bunch have been growing to different pieces of the world and are presently accessible in numerous universal nations including America, Australia and across Europe. Topman offer various advancements regularly including the upto deals consistently. One fundamental advancement offered is understudy markdown which is for the most part increased when the new college term begins as understudy have quite recently gotten their advances. Different advancements offered are limits if a store card is opened alongside the buy. The battles run are appeared on enormous loads up coming up, flyers around the store, on apparel hanger’s, magazines and over the Internet. Topman depend vigorously via web-based networking media for advancements and publicizing as they don’t use TV crusades, different strategies used to show the advancements are through informal exchange particularly when understudy occasions are run.

Feildwork Example

Feildwork Example Feildwork â€" Assignment Example > Mid placement report (presentation script)Introduction: Women Shelter Armidale is for homeless women or at risk of homelessness, and for women who experience domestic violence or have housing difficulties. Women Shelter Armidale provide support services for women and children to find accommodation. And support them under any circumstances. WSA is non-government organization. It funded by NSW government. WSA conceived by local women. The Women Shelter Armidale support women with different services such as brokerage, food, transport, adult, and children support and short-term accommodation. The aim of Women Shelter Armidale is to support women who suffer from domestic violence by running educational program on domestic violence and raise the awareness about DV. Besides, Women Shelter running support groups for women who face domestic violence and isolation. The adult support workers also work with their clients to addressing the issues about domestic violence and making them aware o f behaviors surrounding domestic violence. Worked I have done: At the beginning of my placement, I learned about the way of work by shadowing other workers to get an idea of how they work in the organization and how they collaborate with other organizations. I have done some general work such as translating sign sheets, answering the phone, organize and tidying child support room, helping the workers with support groups. Then I joined some meetings with the support workers when they met the clients, and I learned about how they assess the clients by asking them several questions about their situation and how they are completing an assessment form, and I have seen the initial assessment process as well. Also, I have observed some of the support workers while addressing their clients’ needs, for example, how they help their clients to find a house, and how they are providing transport and assistant with food. I went to the food pantry with the support worker to take some food for free to provide it to the clients. I was not able to provide transport for clients because I do not have driving licenses, but I went with other workers while they provide it for their clients. Also, I attended training group with the organization members to train us about how to set car seat which can help us to ensure the safety of children like it is a part of organization duty of care. Besides, I discussed the safety in the workplace with the agency supervisor; she explained the policy and procedures in the organization. I engaged in several groups for women and children to help me to have an idea about how to planning and creating groups, and I observed their way of working with the group and their way of undertaken an assessment. There are several groups such as Creative Playing, Children Support Group and Young Women Support Group (Walcha). Creative Playing Group is for children who are under school age; it runs every Friday from 10-11:30 am. Children Support Group is for c hildren who are in school age, and it is run every Tuesday from 4-5:30 pm. Young Women Support Group is for school girls in Walcha; it is run every Tuesday from 2-3 pm. Sometimes I helped the support workers in the groups we run in the organization by organized the materials and prepared for morning or afternoon tea for the group members, also I participated in the group activities such as, playing with children, reading stories, coloring and making some craft.

The Spanish Armada Of King Philip II - 1413 Words

In 1588, King Philip II of Spain sent a fleet of one hundred and thirty ships to her majesty Elizabeth I’s England to ultimately eradicate Protestantism. His country, Spain, was fully Catholic, so being Protestant would have been considered an act of high treason. Already provoked by England’s their religious intent, he was pushed over the edge when they started pirating ships from the Spanish Netherlands (currently the Netherlands, formerly ruled by Spain) for goods. He sent over a mighty fleet commanded by Admiral Marquis of Santa Cruz and the Duke of Medina Sidonia to regain control of the North Sea and exterminate Protestantism. Despite being vastly outnumbered, due to ingenuity, skill, and luck, the English forces were able to†¦show more content†¦Galleons were the Spanish superpowers having three masts and heavy artillery onboard. Galleys were a bit smaller but mainly used to ram other ships with their pointy beaks. They were the fastest ships the S panish navy owned. During this building of the Armada, Lastly, there were the merchant vessels. These were like the militia in the Revolutionary War; weak and small, but highly necessary. While this armada was being built, Philip II decided to have his infantry set base in Flanders, Belgium. This army consisted of about thirty two thousand men commanded by the Duke of Parma, matchless in skill. Their mission was to wait until the Armada got close to London and then help lay siege by joining forces with the Armada. The English, on the other hand, were superior at more a more modern naval warfare style utilizing guns and artillery contrary to boarding enemy ships. Thankfully for the British, their coastal beacons informed them about the Armada soon after Spain decided to construct their own fleet. The English fleet consisted of only thirty four â€Å"race-built† warships and one hundred sixty three merchant vessels. These warships were much faster than any ships the Sp anish had, but also highly vulnerable to cannonfire. The English sailors were greatly more skillful than the Spaniards, though, so they were able to rely on ability rather than size. Charles Howard, Second Baron Howard of Effingham was nominated to command these English Forces. He wasShow MoreRelatedKing Philip II Of Spain1631 Words   |  7 Pagesthat King Philip II of Spain was a great King and the idea of The Spanish Armada was a good idea that he had come up with. The Spanish Armada is about a boat that set sail in July 1588 by the Spanish, and it was ordered by the catholic King Philip II of Spain to invade England and take down the protestant Queen Elizabeth I. Queen Elizabeth I, was catholic but then became protestant. The Church did not like her decision and they wanted her to become catholic again, so the Pope encouraged King PhilipRead MoreThe Spanish Armada By William Shakespeare1319 Words   |  6 PagesThe Spanish Armada is about a boat that set sail in July 1588 b y the Spanish, and it was ordered by the catholic King Philip ii of Spain to invade England and take down the protestant Queen Elizabeth i. Queen Elizabeth i, was catholic but then became protestant. The Church did not like her decision and they wanted her to become catholic again, so the Pope encouraged King Philip ii of Spain if he could try to make England catholic again. King Philip agreed to do what the Pope had asked of him. ForRead MoreElizabeth I and the Spanish Armada Essay1352 Words   |  6 PagesElizabeth I and the Spanish Armada The cold, stormy night was all too familiar to the English. A devious plan by Spains king, Philip II, was being formed to overthrow Queen Elizabeth I of England and rid the world of the English heretics.1 It was a story of deception, false judgments, and poor planning. What was one kings dream turned into his countrys nightmare. While the Spanish had bad leaders, the English had good ones. The Spanish had bigger, but slower ships, while the English hadRead MoreThe Armada Of The Spanish Armada1200 Words   |  5 Pages THE SPANISH ARMADA Armada Portrait Queen Elizabeth I The Armada Portrait Buy at Allposters.com The defeat of the Spanish Armada is one of the most famous events in English history. It was arguably Queen Elizabeth s finest hour. For years she had been hailed as the English Deborah, the saviour of the English people, and now it seemed that this is what she had really become. She was now Bellona, the goddess of war, and in triumph she had led her people to glory, defeating the greatest power inRead More The Spanish Armada Essay759 Words   |  4 Pages The Spanish Armada also called the Invincible Armada, and more correctly La Armada Grande. It was a fleet intended to invade England and to put an end to the English aggression against the Spanish Crown. However it was a fatal mistake and after a week’s fighting the Spanish Armada was shattered, this led to the gradual decline in maritime power of Spain. Spanish powers dominated and influence much of the â€Å"known world† during the 16th Century. Spanish leader King Phillip II had reasons to eliminateRead MoreEssay King Phillip II of Spain: The Battle of Lepanto in 1571616 Words   |  3 PagesSpain and Europe and in 1585. The Ottoman Empire signed a peace treaty and ended the war. Marriage Phillip’s father, Charles V, arranged Phillip’s marriage to Queen Mary I of England. In order to get Phillip to Mary’s level Charles made Phillip the king of Naples and of Jerusalem. They were married on July 25th, 1554 at Winchester Cathedral in Winchester, Hampshire, England. With their marriage Phillip obtained all of Mary’s titles and honors, also all Acts of Parliament had to have both Mary andRead MoreThe War Between Spain And England1723 Words   |  7 Pagesbattle between the massive Spanish Armada and the much smaller English fleet. With superior strategy, ships, and confidence, the English managed to not only fend off the Spanish but handily defeat them, preventing what could have been a huge invasion and disaster. Queen Elizabeth herself came to rally the troops, giving them the confidence to triumph over the Spanish (Kallen, 2013). It is apparent that this battle was a major battle and turning point in history. If the Spanish had won, history wouldRead MoreElizabethan Pirates Essay1092 Words   |  5 PagesSpain was Catholic, and King Philip II wanted all the other countries to be Catholic as well. These different beliefs led to major conflict between the two countries. King Philip also wanted England for his own so that he could control the English channel, which would allow access to lands in the north. These tensions actually led to the English war with Spain, which started around 1585-1587 (The Spanish Armada). All this led to one major problem for the English: if the Spanish came to conquer EnglandRead More Queen Elizabeth Essay examples1227 Words   |  5 Pageshad a baby girl, rather then a boy. However these parents were glad by the birth of their first child together. These proud parents were the king and queen of England, King Henry VIII and Anne Boleyn. The girl child was named Elizabeth. The only reason for the birth of Elizabeth had been that she would have been male so that he could have been the heir to King Henry the VIII. It wasnamp;#8217;t until two years later that Henry realized he wasnamp;#8217;t going to get a healthy male heir from AnneRead More Why the Spanish Armada Invaded Britain and Lost Essay1180 Words   |  5 PagesSpanish Armada Essay In this essay I am going to look at why the Spanish armada wanted to invade Britain and why they failed to do so, was it down to luck or were the British too smart for the Spanish. And was it all Englands glory? The Spanish wanted to invade England was mainly to turn England back into a catholic country, and to get Queen Elizabeth of the throne and to get a queen who was for the catholic monarch on the throne. However there are many other reasons: Firstly Philip II couldn

The Millennial Generation Must End Islam Phobia - 1259 Words

Amendment l. of the Constitution states, â€Å"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances† (US Cons. amend. I. Print). This right has been taken away from Muslims, Millennials need to work together to reach solidarity for the Muslim community. The Millennial Generation must end Islam phobia in the United States and around the world by organizing campaigns, protesting, and creating a politics of solidarity for freedom of religion against racism. The Millennial Generation must end Islam phobia in the United States and around the world by allowing them the freedom to practice their religion, preventing verbal abuse, and stopping stereotyping. Before the September 11, 2001, hatred towards Muslims in the United States started in 1923, when Muslims started migrating to the United States, an unlike increased presence. The hatred towards Muslims, also known as â€Å"Islam phobia†, was first featured in The Journal of Theological Studies. Many Muslims were targeted, the religion of Islam, Muslims, or any ethnic group perceived to be Muslim were characterized as having â€Å"bad faith and cruelty†, according to prejudice Americans. Ever since the start of September 11, 2001, Muslims around the world and in the United States have been targeted, taken to war, murdered,

Mercury Free Essays

Mercury International, Ltd is already at the forefront of the shoe manufacturing industry being in direct competition with the world’s biggest names in shoes manufacturing. These include Nike, Reebok and Puma. Thus, what they have to do is to sustain there marketing output, yet continue enhancing the way they compete with the present market. We will write a custom essay sample on Mercury or any similar topic only for you Order Now Relative to other leaders in the industry, they are very near behind, although Mercury shoes are unheard yet in other parts of the world. Having the same technological edge with other brands, there is a possibility that it can surpass others given the chance to maximize its potential using new marketing techniques. Several factors have contributed to Mercury International, Ltd’s performance. Although some of these are technological in nature, still the key factor to its growth is adhering to tested marketing principles. Some of these are; product innovations, making the most of market trend information, market expansion, and relying on concrete statistical data. But, to sustain the growth of a company, one has to remedy first the aspects or areas which keep the company grounded and not able to grow at the rate that it should be. Hence, an analysis on the factors prejudicial to the company and need to be improved is imperative. On the operational side of things, we cannot see much of a problem because it expanded its market to other countries, and having also product-development centers in China, Taiwan and Indonesia. The combined production capacity of these centers can very well meet consumer demands, at least in Asia alone. So there is a need to put up production centers in Europe and Latin American countries alone, so that Mercury’s products will be well distributed, and at the same time gain exposure to new markets. European and Latin American countries composed a very big share the shoe industry market, thus there’s a need for the company to capture these areas of the market. Its expenses can be further reduced by using technology. The fact that the company is at par with other company regarding the technology used in its production, it can reduced its expenses by mass-producing their products in a single period of time and later on put emphasis on its marketing, doing the production and marketing in phases. Eventually, all marketing processes could be covered, yet there would be no waste in effort and energy by doing different processes in a given time, thus big expenses can be avoided. On the financial side of its operations, an analysis on its financial and management reports gives a picture as to how the company is faring in the worldwide market. By the end of the year 2005, its total market share was only 9.1%; this information explains that there is still a huge chunk of the market that needs to be covered. Seeing this in the negative, it seems that the company is far from other companies in terms of market covered. But profitability cannot be measured by the size of the market covered alone, but through the actual profit made. A closer analysis of its income statement showed that there was a deficit of $10.13 million incurred during 2003 alone, and the succeeding combined income for the years 2004 and 2005 was barely able to compensate the 2003 deficit, the combined income being only $13.08 million. A growth of only $3.05 million was realized over the past three years. In essence, the company is not doing well financially. Â  Mercury Shoes, Ltd. can do much better that this. Yet, on the brighter side, we can glimpse from the financial reports that, at the least, there was a recorded growth between 2004 and 2005. This is enough for the management to persevere even harder to raise this notch to higher level. Perhaps, the company should put emphasis on the development of its operational system, because when its operations are exemplary, a good performance relating to its income will follow later. A complete operational overhaul is not needed. The company excels in other areas far better than other companies do. It has a technological edge over others, and its research and development is exemplary providing products to consumers with innovative technology. Almost 98% of human labor in the actual production of shoes and apparel has already been eliminated by robotic technology. Manufacturing is in an automated mode. These factors alone don’t justify the need to overhaul the operational system of the company completely. If changes are to be made, it should be done in the human resource and marketing divisions of the company. The brain of a particular organization lies in the management officials that lead the company. It is, therefore, logical to surmise that the failure of a company can be attributed to the leaders’ incapability. The marketing department also has the power to attract consumers to buy the company’s products, failure to do so justify their incompetence. The technological advantage, R D programs, and the manufacturing process of the company should be retained. The rest should be change and improved for the benefit of the whole company. Generally, Mercury International, Ltd. has a potential in being a leader of the shoe and apparel manufacturing industry. What is has to do is to align its operations and processes into a single output force looking at a single objective. Although, the company hasn’t yet reached this stage of organizational development, with patience, cooperation, and continuous development of its product with the use of cutting-edge technology, it will eventually. What the management has to do is to sustain the over-all output to maintain its position yet continue to strive and develop further. The backbone of the company’s product line, the Boost Technology, TrailStep, and the Sweatless Training Apparel should further be strengthened, so that the company will have security on where to get its money for expenses when changes are to be made in other areas of the company. With the managerial officers having already the skills to effectuate changes on the company, what they have to do only is to use their skills at the utmost and steer the company to where it grows the most. How to cite Mercury, Essay examples

Career Management for Social Learning Theory-myassignmenthelp

Question: Discuss about theCareer Management for Social Learning Theory. Answer: Introduction: The report aims at discussing career management. Therefore, the report commences with a discussion on three theories related to career construction and on the role of resilience, identity, adaptability and learning in the journey towards career success. Social Learning Theory: The social learning theory of career construction helps in explaining how the individuals make occupational choices (Leong, 2014). This theory attributes to the occupational placement to uncountable learning experiences some planned and others unplanned thereby influencing the path of occupational maze. Unlike the conventional models of career counseling, the social learning theory enables welcoming indecision as sensible approach towards an unpredictable and complex future. In addition, this theory also acknowledges the fact that there exist various events that remains out of the control of the clients from which the clients can not only recognize but also create and take advantage. In this context, let us draw in the example of Thomas, who developed an early interest in mathematics. He mastered the subject at the age of three and by the age of ten, he was ahead of the math class and found the class too boring. However, his fifth teacher realized the fact and asked him for tutoring few of his classmates. In the process, Thomas learned that he enjoyed helping the classmates in mastering the newer mathematics skills. Social Cognitive Career Theory The social cognitive theory represents a new theory that focuses on explaining the three aspects of career development that are interrelated (Conklin, Dahling Garcia, 2013). This includes the development of the basic career and academic interest, the process of making an educational and career choice and obtaining career and academic success. The theory incorporated concepts like abilities, values, interest and environmental factors that helped in influencing career development. For example, a person might be very confident in accomplishing tasks for the successful entry and performance in the scientific field but might not be confident about his/her abilities in enterprising or social fields like sales. The theory however focuses on the fact that a person will not only pursue and become interested but also perform better in activities where they possess strong beliefs related to self-efficacy. Career Construction Theory The career construction theory represents one of the theories related to career construction that helps in explaining the work adjustment and the occupational choice, where each questions a different aspect of the vocational behavior (Chan et al., 2015). For example, the career construction theory responds to the needs of present day mobile workers who might who might feel confused and fragmented as a result of restructuring of the occupations, multicultural imperatives and transformation of labor force. Role of Resilience, Identity, Adaptability and Learning in the Journey to Career Success Resiliencerefers to the ability of adjusting to the changes in the world. In the professional context, resiliency helped me to down the punches with a much greater ease (Ng Feldman, 2014). Identity is the belief that I possess about myself. Positive identity has helped me in pursuing more opportunities for growth that increased my chances of career success. Adaptability represented my psychological skills and capacity that helped me in managing transitions, tasks and the traumas related to the exploration of career. The process of leaning kept me up to date, enabled development of natural abilities and relationships, be productive and thereby achieve fulfillment. Conclusion: The report ends by giving an insight into how the different career construction theories help in career management. One is also able to see how resilience, identity, adaptability and learning help in path towards success. References: Chan, K. Y., Uy, M. A., Moon-ho, R. H., Sam, Y. L., Chernyshenko, O. S., Yu, K. Y. T. (2015). Comparing two career adaptability measures for career construction theory: Relations with boundaryless mindset and protean career attitudes.Journal of Vocational Behavior,87, 22-31. Conklin, A. M., Dahling, J. J., Garcia, P. A. (2013). Linking affective commitment, career self-efficacy, and outcome expectations: A test of social cognitive career theory.Journal of Career Development,40(1), 68-83. Leong, F. (Ed.). (2014).Career development and vocational behavior of racial and ethnic minorities. Routledge. Ng, T. W., Feldman, D. C. (2014). Subjective career success: A meta-analytic review.Journal of Vocational Behavior,85(2), 169-179.

Advantages And Disadvantages of Living in a Big City free essay sample

Big cities such as Jakarta, Melbourne or New York are great places where you can find many tall buildings, vehicles, recreational areas and various other things that cannot be found in small town or villages. (Bigcity, n. d. ) Most people prefer living in a big city because in a place where the economy is constantly growing and where anything is possible, it is significantly easier to find a good job with a better quality of life. However aside from the numerous advantages of living in a big city, there are also a few down points to living there. First of all, in a big city we can get what we cannot find in village or small town. For example, in a big city there are many malls, cinemas, nightclubs, restaurants and sport stations. Malls are really nice places to hang out with friends at because the buildings are designed in such a way that people feel comfortable spending large amounts of time in them. We will write a custom essay sample on Advantages And Disadvantages of Living in a Big City or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Customers are provided with a good service and they are able to find many products, not only the ones they need, but also the ones they want. Also people can taste a lot of different kinds of food from different provinces or countries. Secondly, schools in a big city is relatively more qualified and recognized than schools in small towns, and there are even schools with an international standard, which enable children to be more developed in different languages such as English, Chinese and many more. Thirdly, in a big city usually there are a lot of hospitals with advanced technology and better medical treatments because they recruit the doctors who are well-known in the country, and sometimes these hospitals even employ doctors from other countries. In short, patients are more likely to receive better care and treatments in a big city than in small towns. Next, travelling is much easier because in a big city there are good transportation systems such as airplanes, trains, buses, and others. Usually international flights are only available from major cities, as there would be bigger airports. The road systems would be better, hence the buses and trains would be able to service more people to greater distances, so it is relatively easier for residents to travel. Lastly, networking is not such a big problem in big cities, because a big city is where people from all over the world travel to and reside. It is more possible to socialize with and befriend people of different nationalities in a big city. (Shane62, 2010) However, living in a big city also has its disadvantages. For example, the high level of unemployment. As it is known, many people want to go to a big city to find a job but unfortunately it can be really hard because every year the population in these cities is increasing, which means there will be less jobs available. Next, the cost of living is very high. Land is very expensive as less land is available for building house or offices. Taxes are also higher. In small towns, people usually shop at traditional markets, which has fairly low prices. In big cities, the prices of foodstuffs are usually marked up, which means buying food is much more expensive in big cities than in small towns. Another major disadvantage is the terrible traffic conditions. Traffic jams usually happen in big cities, because big cities are often really crowded and nowadays people are more likely to use their private vehicles rather than using the public transportation. The more cars are out on the roads, the higher the possibility for congestions is. The next disadvantage is air pollution. The government keeps building high-rises and real estates that there is hardly any space left to plant trees and build parks. The large number of cars also contributes to the high level of pollution. As the emission from cars is not controlled, old vehicles produce a vast amount of smog that contain CO2 which in turn, causes global warming. (Shane26,2010) (Waxpoeticg,2013) To sum up, living in a big city has its advantages and disadvantages. However in my opinion, living in a big city is really good because one can get a good education, excellent healthcare, easy transportation and find many wonderful recreational facilities.

Meri Moken †Why Antibiotics Stop Working

Meri Moken – Why Antibiotics Stop Working Free Online Research Papers In 1993, when Meri Moken got recognized by various institutions for her research work on the effect of detergents on bacteria, a lot of her work was actually a reflection of a broader spectrum of research that had started as early as the 1960s. What Meri essentially discovered was the resistance of bacteria to household detergents and bleaches – a subset of the age-old capability by bacteria to adapt to harmful chemicals. Her discovery illuminated the ever-burgeoning problems that pathogens present: that, over time, they become harder to eradicate, as any chemicals used against them become ineffective. Pathogens present a huge problem in the medical world, because not only are they becoming more problematic despite advances in antibiotics, but also because the advances are actually making the problem worse. As an illustration, the Escherichia coli, an intestinal bacterium, grew resistant to all fluoroquinolone antibiotics administered against it within a decade. This high rate of adaptation presents a grave problem, since it implies that scientific advances would be hard-pressed to keep up with the bacteria. Then, in 1994, it was discovered that some strains of Streptococcus pneumonia were resistant to Penicillin, and that a full 25% of all people suffering from this Pneumonia were resistant to antibiotics. It was a further indication that the war against pathogen was slowly, but surely, being lost. There are several ways in which bacteria can gain mastery over any antibiotic thrown at them. Every new antibiotic essentially places a kind of selective pressure on them, and the most adapted amongst them survive down the generations. Sometimes, a spontaneous mutation in the bacterial DNA may result in an organism with a higher level of resistance. Other bacteria engage in a process called transformation – a microbial sex-like process in which DNAs are shuffled between two organisms. But most ominous of all adaptation methods is the one in which bacteria interchange a section of DNA called a plasmid amongst themselves. It is ominous since it presents a very efficient way of increasing the overall adaptability of bacteria, without incurring the unpredictability that mutation presents. The resistance that results from the DNA changes within the bacteria is expressed in several ways, at the molecular level. Some of the bacteria change the target molecule, essentially inactivating it and thus making it harmless. Others go a step further and decompose the molecule into its elements. Others simply sequester the offending drug, thus keeping it away from their warpaths. And finally, some bacteria keep the fatal chemicals out of the cells, and prevent their entrance to it. Since the bacterial problem is a serious menace, several solutions have been suggested to help keep bacteria in their rightful place within the biosphere. Firstly, antibiotics should only be used when absolutely necessary. Using them at any other time only increases chances of developing resistance in the microbes. Secondly, all antibiotics, once administered, should be taken until the entire dose is completed. Partially resistant bacteria are less likely to survive and multiply when doses are completed. Thirdly, narrow-spectrum antibiotics should be used, to avoid triggering adaptation mechanism in other bacteria within the vicinity. And finally, vaccines can be innovated to act on a preventative platform rather than a curative one. References Why files (1997) What doesn’t kill them makes them stronger Retrieved 21st January 2009 from Research Papers on Meri Moken - Why Antibiotics Stop WorkingGenetic EngineeringThe Effects of Illegal ImmigrationIncorporating Risk and Uncertainty Factor in CapitalResearch Process Part OneInfluences of Socio-Economic Status of Married MalesBionic Assembly System: A New Concept of Self19 Century Society: A Deeply Divided EraMarketing of Lifeboy Soap A Unilever ProductMind TravelOpen Architechture a white paper

Construction Health and Safety Essay Example | Topics and Well Written Essays - 2500 words

Construction Health and Safety - Essay Example For this reason, some insurance companies fear that handling these risky sites and vouching for the health and the lives of the employees involved in the job may cause them too much funds that may indeed jeopardize their financial stability. Hence, the establishment of the limit of the fund to be allotted for the said issue has already been passed and rather applied in business organizations today. There are certain standards that companies today need to abide with which gives them a chance to be accommodated by several insurance companies in support to the healthcare assurance that they need, however these provisions are guided by certain limitations that both employers and employees must carefully give attention to. This is especially true on the part of those who are involved in the construction industry. In this paper, the statement mentioned above with regards handling risks successfully as an employer, as an employee and as a team of people working together to establish a struc ture, shall be well discussed and assessed as to how much they should be recognized by the current construction project planners at present. Avionics Solution is a small business organization serving as one of the leaders in manufacturing avionics equipment. It started as a family-owned business that delivers quality products given to its regular clients. As of today, Avionics Solution is currently employing at least 48 personnels within its manufacturing facility. It is the main aim of the organization's administration to be of great help to its employees as well as with its clients. Through the establishment of a fine communication system that flows between the employers, the administrative sector and the rank and file employees, the organization's head officers try to bridge the gap existing between the said stakeholders of the organization. Clearly, the mission of the organization to serve the community with the best possible services it could offer have been understood by the organization's authorities to have been effectively sourced out from the establishment of fine camaraderie among the people making up the enti re company, including the employees as the primary actors within the organization's journey towards success. Certainly, Avionics Solution wants to make sure of its competitive status in the manufacturing industry by providing its employees a workplace that stimulates employee interaction and economic growth. However, with all the fine set of missions created by the administration for the entire organization to follow, it has been found out that most of the employees complained about the fact that there are several provisions not granted by the organization, which namely includes health insurance and retirement plan. It is then proposed in this plan paper that the said issue be addressed well. This is to help the company get assured that it would be able to stay in its status of competition within the industry, through its provision of the utmost important factors of consideration for its employees. The said plan proposal

The Philosophy of Epicurus Essay Example | Topics and Well Written Essays - 1250 words

The Philosophy of Epicurus - Essay Example The essay "The Philosophy of Epicurus" discusses the Epicurus's thoughts regarding the capability of everyone for seeking wisdom, the happiness to be the ultimate objective of studying philosophy and concerning religion. At the beginning of the first paragraph of his â€Å"†Letter to Menoeceus†, Epicurus says that everyone either young or old should study philosophy because â€Å"it is never too early nor too late to care for the well-being of the soul†. According to him, philosophy can bring happiness to the soul. One should study it for the happiness of mind. Again Epicurus says that the young people â€Å"can retain the happiness of youth in his pleasant memories of the past† when the old can enjoy the fearlessness of the youth even in their old age: â€Å"although he is old he may at the same time be young by virtue of his fearlessness of the future.† Again at the end of the paragraph, he comments that the ultimate objective of studying philosophy is â€Å"securing happiness†, and therefore â€Å"we do everything in order to gain it†. We can infer that Epicurus believed that happiness is the ultimate objective of studying philosophy. According to Epicurus, our â€Å"common sense† or â€Å"popular opinion† tells us that gods must be immortal and blessed. Indeed this â€Å"common sense† is man’s capability of reasoning or proving something by something by logic. The commonality of man’s perception of himself or others lies at the heart of these â€Å"reasons† or â€Å"common sense†.... Thus we can infer that Epicurus believed that happiness is the ultimate objective of studying philosophy. The Gods 3. Epicurus supposes that we know the gods to be immortal and blessed. Why does he suppose this? According to Epicurus, our â€Å"common sense† or â€Å"popular opinion† tells us that gods must be immortal and blessed. Indeed this â€Å"common sense† is man’s capability of reasoning or proving something by something by logic. In the first place, we must accept that man’s capability of reasoning or devising logic is very subjective. That is, the commonality of man’s perception about himself or others lies at the heart of these â€Å"reasons† or â€Å"common sense†. Man commonly perceives himself as a subject to ephemera and to death: â€Å"while we exist death is not present and when death is present we no longer exist† (Epicurus). Man reasons that gods exist even while â€Å"we no longer exist†. But si nce people popularly believe that gods send blessings and evils to men (though Epicurus assumes these popular beliefs, about gods to have concerns for men, as something wrong) ages after ages, man reasons that they must be immortal and blessed; otherwise, they would not be able to do so. Thus Epicurus supposes that â€Å"commonsense† provokes men to popularly accept that the gods are immortal and blessed. Again once Epicurus says that â€Å"Most men do not retain the picture of the gods that they first receive† (Epicurus 2). This sentence may refer to Epicurus’s belief that man’s knowledge about gods is inborn. This innate or inborn idea about gods’ immortality and blessedness provokes everyone to form a popular opinion that gods must be immortal and blessed. 4. Epicurus infers from the fact that the gods are the immortal and

Radio Resource Management in OFDMA Networks

Radio Resource Management in OFDMA Networks 1 Introduction The convenience and popularity of wireless technology has now extended into multimedia communications, where it poses a unique challenge for transmitting high rate voice, image, and data signals simultaneously, synchronously, and virtually error-free. That challenge is currently being met through Orthogonal Frequency Division Multiplexing (OFDM), an interface protocol that divides incoming data streams into sub-streams with overlapping frequencies that can then be transmitted in parallel over orthogonal subcarriers [2,3]. To allow multiple accesses in OFDM , Orthogonal Frequency Division Multiple Access (OFDMA) was introduced. Relaying techniques, along with OFDMA, are used to achieve high data rate and high spectral efficiency. 1.1 Orthogonal Frequency Division Multiple Access OFDMA, an interface protocol combining features of OFDM and frequency division multiple access (FDMA)., was developed to move OFDM technology from a fixed-access wireless system to a true cellular system with mobility with same underlying technology, but more flexibility was defined in the operation of the system [1,8]. In OFDMA, subcarriers are grouped into larger units, referred to as sub-channels, and these sub-channels are further grouped into bursts which can be allocated to wireless users [4]. 1.2 Relay-Enhanced Networks In cellular systems, a way to achieve remarkable increase in data rate, but without claiming for more bandwidth, is to shrink cell sizes, however, with smaller cells more base stations (BSs) are needed to cover a same area due to which deployment and networking of new BSs acquire significant costs [5]. An alternative solution to this problem is to deploy smart relay stations (RSs), which can communication with each other and with BSs through wireless connections reducing systems cost. A relay station (RS), also called repeater or multi-hop station, is a radio system that helps to improve coverage and capacity of a base station (BS) and the resulting networks employing relay stations are sometimes called cooperative networks [6]. 1.3 Technological Requirement The continuously evolving wireless multimedia services push the telecommunication industries to set a very high data rate requirement for next generation mobile communication systems. As spectrum resource becomes very scarce and expensive, how to utilize this resource wisely to fulfil high quality user experiences is a very challenging research topic. Orthogonal frequency-division multiple access (OFDMA)-based RRM schemes together with relaying techniques allocate different portions of radio resources to different users in both the frequency and time domains and offers a promising technology for providing ubiquitous high-data-rate coverage with comparatively low cost than deploying multiple base stations [5]. Although wireless services are the demand of future due to their mobility and low cost infrastructure but along with this they suffer serious channel impairments. In particular, the channel suffers from frequency selective fading and distance dependent fading (i.e., large-scale fading) [1, 8]. While frequency selective fading results in inter-symbol-interference (ISI), large-scale fading attenuates the transmitted signal below a level at which it can be correctly decoded. Orthogonal Frequency-Division Multiple Access (OFDMA) relay-enhanced cellular network, the integration of multi-hop relaying with OFDMA infrastructure, has become one of the most promising solutions for next-generation wireless communications. 1.3.1 Frequency Selective Fading In wireless communications, the transmitted signal is typically reaching the receiver through multiple propagation paths (reflections from buildings, etc.), each having a different relative delay and amplitude. This is called multipath propagation and causes different parts of the transmitted signal spectrum to be attenuated differently, which is known as frequency-selective fading. In addition to this, due to the mobility of transmitter and/or receiver or some other time-varying characteristics of the transmission environment, the principal characteristics of the wireless channel change in time which results in time-varying fading of the received signal [9]. 1.3.2 Large Scale Fading Large scale fading is explained by the gradual loss of received signal power (since it propagates in all directions) with transmitter-receiver (T-R) separation distance. These phenomenonss cause attenuation in the signal and decrease in its power. To overcome this we use diversity and multi-hop relaying. 1.3.3 Diversity Diversity refers to a method for improving the reliability of a message signal by using two or morecommunication channelswith different characteristics. Diversity plays an important role in combatingfadingandco-channel interferenceand avoidingerror bursts. It is based on the fact that individual channels experience different levels of fading and interference. Multiple versions of the same signal may be transmitted and/or received and combined in the receiver [10]. 1.4 Proposed Simulation Model We developed a simulation model in which each user-pair is allocated dynamically a pair of relay and subcarrier in order to maximize its achievable sum-rate while satisfying the minimum rate requirement. The algorithm and the results of the simulation model are given in chapter 4. 1.5 Objectives The objective of our project is to have a detail overview of the literature regarding Orthogonal Frequency Division Multiple Access (OFDMA), Radio Resource Management (RRM) and Relaying techniques. After literature review we developed a simulation framework in which we will try to use minimum resources to get maximum throughput by using dynamic resource allocation. 1.6 Tools For the design and implementation of proposed Algorithm, we have used the following tools MATLAB Smart Draw Corel Draw 1.7 Overview Chapter 2 contains the literature review. It explains the basic principles of OFDMA, Radio Resource Management (RRM) and the relaying techniques. Chapter 3 explains the implementation of OFDM generation and reception that how an OFDM signal is generated and transmitted through the channel and how it is recovered at the receiver. Chapter 4 could be considered as the main part of thesis. It focuses on the simulation framework and the code. We have followed the paper â€Å"Subcarrier Allocation for multiuser two-way OFDMA Relay networks with Fairness Constraints†. In this section we have tried to implement the Dynamic Resource Allocation algorithm in order to achieve the maximum sum rate. Results are also discussed at the end of the end of the chapter. 2 Literature Review Introduction: First section of this Chapter gives a brief overview about OFDMA.OFDMA basically is the combination of Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Division Multiplexing Access (FDMA).OFDMA provides high data rates even through multipath fading channels. In order to understand OFDMA, we must have brief introduction to Modulation, Multiple Access, Propagation mechanisms, its effects and its impairments while using OFDMA. 2.1 Modulation Modulation is the method of mapping data with change in carrier phase, amplitude, frequency or the combination [11]. There are two types of modulation techniques named as Single Carrier Modulation (SCM) Transmission Technique or Multicarrier Modulation (MCM) Transmission Technique. [12] Single Carrier Modulation (SCM) In single carrier transmission modulation (SCM) transmission, information is modulated using adjustment of frequency, phase and amplitude of a single carrier [12]. Multi Carrier Modulation (MCM) In multicarrier modulation transmission, input bit stream is split into several parallel bit streams then each bit stream simultaneously modulates with several sub-carriers (SCs) [12]. 2.2 Multiplexing Multiplexing is the method of sharing bandwidth and resources with other data channels. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end [13]. 2.2.1 Analog Transmission In analog transmission, signals are multiplexed using frequency division multiplexing (FDM), in which the carrier bandwidth is divided into sub channels of different frequency widths,and each signal is carried at the same time in parallel. 2.2.2 Digital Transmission In digital transmission, signals are commonly multiplexed using time-division multiplexing (TDM), in which the multiple signals are carried over the same channel in alternating time slots. 2.2.3 Need for OFDMA General wireless cellular systems are multi-users systems. We have limited radio resources as limited bandwidth and limited number of channels. The radio resources must be shared among multiple users. So OFDM is a better choice in this case. OFDM is the combination of modulation and multiplexing. It may be a modulation technique if we analyze the relation between input and output signals. It may be a multiplexing technique if we analyze the output signal which is the linear sum of modulated signal. In OFDM the signal is firstly split into sub channels, modulated and then re-multiplexed to create OFDM carrier. The spacing between carriers is such that they are orthogonal to one another. Therefore there is no need of guard band between carriers. In this way we are saving the bandwidth and utilizing our resources efficiently. 2.3 Radio Propagation Mechanisms There are 3 propagation mechanisms: Reflection, Diffraction and Scattering. These 3 phenomenon cause distortion in radio signal which give rise to propagation losses and fading in signals [14]. 2.3.1 Reflection Reflection occurs when a propagating Electro-Magnetic (EM) wave impinges upon an object which has very large dimensions as compared to the wavelength of the propagating wave. Reflections occur from the surface of the earth and from buildings and walls. 2.3.2 Diffraction When the radio path between the transmitter and receiver is obstructed by a surface that has sharp irregularities (edges), diffraction occurs. The secondary waves resulting from the obstructing surface are present throughout the space and even behind the obstacle, giving rise to a bending of waves around the obstacle, even when a line-of-sight path does not exist between transmitter and receiver. At high frequencies, diffraction, like reflection, depends on the geometry of the object, as well as the amplitude, phase and polarization of the incident wave at the point of diffraction. 2.3.3 Scattering When the medium through which the wave travels consists of objects with dimensions that are small compared to the wavelength, and where the number of obstacles per unit volume is large. Scattered waves are produced by rough surfaces, small objects or by other irregularities in the channel. In practice, foliage, street signs and lamp posts produce scattering in a mobile radio communications system. 2.4 Effects of Radio Propagation Mechanisms The three basic propagation mechanisms namely reflection, diffraction and scattering as we have explained above affect on the signal as it passes through the channel. These three radio propagation phenomena can usually be distinguished as large-scale path loss, shadowing and multipath fading [14][15]. 2.4.1 Path Loss Path Lossis the attenuation occurring by an electromagnetic wave in transit from a transmitter to a receiver in a telecommunication system. In simple words, it governs the deterministic attenuation power depending only upon the distance between two communicating entities. It is considered as large scale fading because it does not change rapidly. 2.4.2 Shadowing Shadowingis the result of movement of transmitter, receiver or any channel component referred to as (obstacles). Shadowing is a statistical parameter. Shadowing follows a log-normal distribution about the values governed by path loss. Although shadowing depends heavily upon the channel conditions and density of obstacles in the channel, it is also normally considered a large scale fading component alongside path loss. 2.4.3 Multipath Fading Multipath Fadingis the result of multiple propagation paths which are created by reflection, diffraction and scattering. When channel has multiple paths. Each of the paths created due to these mechanisms may have its characteristic power, delay and phase. So receiver will be receiving a large number of replicas of initially transmitted signal at each instant of time. The summation of these signals at receiver may cause constructive or destructive interferences depending upon the delays and phases of multiple signals. Due to its fast characteristic nature, multipath fading is called small scale fading. 2.5 Orthogonal Frequency Division Multiplexing (OFDM) Orthogonal Frequency Division Multiplexing (OFDM) is an efficient multicarrier modulation that is robust to multi-path radio channel impairments [15]. Now-a-days it is widely accepted that OFDM is the most promising scheme in future high data-rate broadband wireless communication systems. OFDM is a special case of MCM transmission. In OFDM, high data rate input bit stream or data is first converted into several parallel bit stream, than each low rate bit stream is modulated with subcarrier. The several subcarriers are closely spaced. However being orthogonal they do not interfere with each other. 2.5.1 Orthognality Signals are orthogonal if they are mutually independent of each other. Orthogonality is a property that allows multiple information signals to be transmitted perfectly over a common channel and detected, without interference. Loss of orthogonality results in blurring between these information signals and degradation in communications. Many common multiplexing schemes are inherently orthogonal. The term OFDM has been reserved for a special form of FDM. The subcarriers in an OFDM signal are spaced as close as is theoretically possible while maintain orthogonality between them.In FDM there needs a guard band between channels to avoid interference between channels. The addition of guard band between channels greatly reduces the spectral efficiency. In OFDM, it was required to arrange sub carriers in such a way that the side band of each sub carrier overlap and signal is received without interference. The sub-carriers (SCs) must be orthogonal to each other, which eliminates the guard band and improves the spectral efficiency . 2.5.2 Conditions of orthogonality 2.5.2.1 Orthogonal Vectors Vectors A and B are two different vectors, they are said to be orthogonal if their dot product is zero 2.6 OFDM GENERATION AND RECEPTION OFDM signals are typically generated digitally due to the complexity of implementation in the analog domain. The transmission side is used to transmit digital data by mapping the subcarrier amplitude and phase. It then transforms this spectral representation of the data into the time domain using an Inverse Discrete Fourier Transform (IDFT) but due to much more computational efficiency in Inverse Fast Fourier Transform (IFFT), IFFT is used in all practical systems. The receiver side performs the reverse operations of the transmission side, mixing the RF signal to base band for processing, and then a Fast Fourier Transform (FFT) is employed to analyze the signal in the frequency domain. The demodulation of the frequency domain signal is then performed in order to obtain the transmitted digital data. The IFFT and the FFT are complementary function and the most suitable term depends on whether the signal is being recovered or transmitted but the cases where the signal is independent of this distinction then these terms can be used interchangeably [15]. 2.6.1 OFDM Block Diagram 2.6.2 Implementation of OFDM Block Diagram 2.6.2.1 Serial to Parallel Conversion: In an OFDM system, each channel can be broken down into number of sub-carriers. The use of sub-carriers can help to increase the spectral efficiency but requires additional processing by the transmitter and receiver which is necessary to convert a serial bit stream into several parallel bit streams to be divided among the individual carriers. This makes the processing faster as well as is used for mapping symbols on sub-carriers. 2.6.2.2 Modulation of Data: Once the bit stream has been divided among the individual sub-carriers by the use of serial to parallel converter, each sub-carrier is modulated using 16 QAM scheme as if it was an individual channel before all channels are combined back together and transmitted as a whole. 2.6.2.3 Inverse Fourier Transform: The role of the IFFT is to modulate each sub-channel onto the appropriate carrier thus after the required spectrum is worked out, an inverse Fourier transform is used to find the corresponding time domain waveform. 2.6.2.4 Parallel to Serial Conversion: Once the inverse Fourier transform has been done each symbol must be combined together and then transmitted as one signal. Thus, the parallel to serial conversion stage is the process of summing all sub-carriers and combining them into one signal 2.6.2.5 Channel: The OFDM signal is then transmitted over a channel with AWGN having SNR of 10 dB. 2.6.2.6 Receiver: The receiver basically does the reverse operations to the transmitter. The FFT of each symbol is taken to find the original transmitted spectrum. The phase angle of each transmission carrier is then evaluated and converted back to the data word by demodulating the received phase. The data words are then combined back to the same word size as the original data. 2.7 OFDMA in a broader perspective OFDM is a modulation scheme that allows digital data to be efficiently and reliably transmitted over a radio channel, even in multipath environments [17]. OFDM transmits data by using a large number of narrow bandwidth carriers. These carriers are regularly spaced in frequency, forming a block of spectrum. The frequency spacing and time synchronization of the carriers is chosen in such a way that the carriers are orthogonal, meaning that they do not interfere with each other. This is despite the carriers overlapping each other in the frequency domain [18]. The name ‘OFDM is derived from the fact that the digital data is sent using many carriers, each of a different frequency (Frequency Division Multiplexing) and these carriers are orthogonal to each other [19]. 2.7.1 History of OFDMA The origins of OFDM development started in the late 1950s with the introduction of Frequency Division Multiplexing (FDM) for data communications. In 1966 Chang patented the structure of OFDM and published the concept of using orthogonal overlapping multi-tone signals for data communications. In 1971 Weinstein introduced the idea of using a Discrete Fourier Transform (DFT) for Implementation of the generation and reception of OFDM signals, eliminating the requirement for banks of analog subcarrier oscillators. This presented an opportunity for an easy implementation of OFDM, especially with the use of Fast Fourier Transforms (FFT), which are an efficient implementation of the DFT. This suggested that the easiest implementation of OFDM is with the use of Digital Signal Processing (DSP), which can implement FFT algorithms. It is only recently that the advances in integrated circuit technology have made the implementation of OFDM cost effective. The reliance on DSP prevented the wide spread use of OFDM during the early development of OFDM. It wasnt until the late 1980s that work began on the development of OFDM for commercial use, with the introduction of the Digital Audio Broadcasting (DAB) system. 2.7.2 Advantages using OFDMA There are some advantages using OFDMA. OFDM is a highly bandwidth efficient scheme because different sub-carriers are orthogonal but they are overlapping. Flexible and can be made adaptive; different modulation schemes for subcarriers, bit loading, adaptable bandwidth/data rates possible. Has excellent ICI performance because of addition of cyclic prefix. In OFDM equalization is performed in frequency domain which becomes very easy as compared to the time domain equalization. Very good at mitigating the effects of delay spread. Due to the use of many sub-carriers, the symbol duration on the sub-carriers is increased, relative to delay spread. ISI is avoided through the use of guard interval. Resistant to frequency selective fading as compared to single carrier system. Used for high data rate transmission. OFDMA provides flexibility of deployment across a variety of frequency bands with little need for modification is of paramount importance. A single frequency network can be used to provide excellent coverage and good frequency re-use. OFDMA offers frequency diversity by spreading the carriers all over the used spectrum. 2.7.3 Challenges using OFDMA These are the difficulties we have to face while using OFDMA [20][21][22], The OFDM signal suffers from a very high peak to average power ratio (PAPR) therefore it requires transmitter RF power amplifiers to be sufficiently linear in the range of high input power. Sensitive to carrier frequency offset, needs frequency offset correction in the receiver. Sensitive to oscillator phase noise, clean and stable oscillator required. The use of guard interval to mitigate ISI affects the bandwidth efficiency. OFDM is sensitive to Doppler shift frequency errors offset the receiver and if not corrected the orthogonality between the carriers is degraded. If only a few carriers are assigned to each user the resistance to selective fading will be degraded or lost. It has a relatively high sensitivity to frequency offsets as this degrades the orthogonality between the carriers. It is sensitive to phase noise on the oscillators as this degrades the orthogonaility between the carriers. 2.7.4 Comparison with CDMA in terms of benefits 2.7.4.2 CDMA Advantages: CDMA has some advantages over OFDMA [22], Not as complicated to implement as OFDM based systems. As CDMA has a wide bandwidth, it is difficult to equalise the overall spectrum significant levels of processing would be needed for this as it consists of a continuous signal and not discrete carriers. Not as easy to aggregate spectrum as for OFDM. 2.7.5 OFDMA in the Real World: UMTS, the European standard for the 3G cellular mobile communications, and IEEE 802.16, a broadband wireless access standard for metropolitan area networks (MAN), are two live examples for industrial support of OFDMA. Table 1 shows the basic parameters of these two systems. Table 1. OFDMA system parameters in the UMTS and IEEE 802.16 standards 2.8 Radio Resource Management In second section of this chapter we will discuss radio resource management schemes, why we need them and how they improve the efficiency of the network. Radio resource management is the system level control of co-channel interference and other radio transmission characteristics in wireless communication systems. Radio resource management involves algorithms and strategies for controlling parameters such as Transmit power Sub carrier allocation Data rates Handover criteria Modulation scheme Error coding scheme, etc 2.8.1 Study of Radio Resource Management End-to-end reconfigurability has a strong impact on all aspects of the system, ranging from the terminal, to the air interface, up to the network side. Future network architectures must be flexible enough to support scalability as well as reconfigurable network elements, in order to provide the best possible resource management solutions in hand with cost effective network deployment. The ultimate aim is to increase spectrum efficiency through the use of more flexible spectrum allocation and radio resource management schemes, although suitable load balancing mechanisms are also desirable to maximize system capacity, to optimize QoS provision, and to increase spectrum efficiency. Once in place, mobile users will benefit from this by being able to access required services when and where needed, at an affordable cost. From an engineering point of view, the best possible solution can only be achieved when elements of the radio network are properly configured and suitable radio resource m anagement approaches/algorithms are applied. In other words, the efficient management of the whole reconfiguration decision process is necessary, in order to exploit the advantages provided by reconfigurability. For this purpose, future mobile radio networks must meet the challenge of providing higher quality of service through supporting increased mobility and throughput of multimedia services, even considering scarcity of spectrum resources. Although the size of frequency spectrum physically limits the capacity of radio networks, effective solutions to increase spectrum efficiency can optimize usage of available capacity. Through inspecting the needs of relevant participants in a mobile communication system, i.e., the Terminal, User, Service and Network, effective solutions can be used to define the communication configuration between the Terminal and Network, dependent on the requirements of Services demanded by Users. In other words, it is necessary to identify proper communications mechanisms between communications apparatus, based on the characteristics of users and their services. This raises further questions about how to manage traffic in heterogeneous networks in an efficient way. 2.8.2 Methods of RRM 2.8.2.1 Network based functions Admission control (AC) Load control (LC) Packet scheduler (PS) Resource Manager (RM) Admission control In the decision procedure AC will use threshold form network planning and from Interference measurements. The new connection should not impact the planned coverage and quality of existing Connections. (During the whole connection time.) AC estimates the UL and DL load increase which new connection would produce. AC uses load information from LC and PC. Load change depends on attributes of RAB: traffic and quality parameters. If UL or DL limit threshold is exceeded the RAB is not admitted. AC derives the transmitted bit rate, processing gain, Radio link initial quality parameters, target BER, BLER, Eb/No, SIR target. AC manages the bearer mapping The L1 parameters to be used during the call. AC initiates the forced call release, forced inter-frequency or intersystem handover. Load control Reason of load control Optimize the capacity of a cell and prevent overload The interference main resource criteria. LC measures continuously UL and DL interference. RRM acts based on the measurements and parameters from planning Preventive load control In normal conditions LC takes care that the network is not overloaded and remains Stable. Overload condition . LC is responsible for reducing the load and bringing the network back into operating area. Fast LC actions in BTS Lower SIR target for the uplink inner-loop PC. LC actions located in the RNC. Interact with PS and throttle back packet data traffic. Lower bit rates of RT users.(speech service or CS data). WCDMA interfrequency or GSM intersystem handover. Drop single calls in a controlled manner. 2.8.2.3 Connection based functions Handover Control (HC) Power Control (PC) Power control Uplink open loop power control. Downlink open loop power control. Power in downlink common channels. Uplink inner (closed) loop power control. Downlink inner (closed) loop power control. Outer loop power control. Power control in compressed mode. Handover Intersystem handover. Intrafrequency handover. Interfrequency handover. Intersystem handover. Hard handover (HHO). All the old radio links of an MS are released before the new radio links are established. Soft handover (SHO) SMS is simultaneously controlled by two or more cells belonging to different BTS of the same RNC or to different RNC. MS is controlled by at least two cells under one BTS. Mobile evaluated handover (MEHO) The UE mai Radio Resource Management in OFDMA Networks Radio Resource Management in OFDMA Networks 1 Introduction The convenience and popularity of wireless technology has now extended into multimedia communications, where it poses a unique challenge for transmitting high rate voice, image, and data signals simultaneously, synchronously, and virtually error-free. That challenge is currently being met through Orthogonal Frequency Division Multiplexing (OFDM), an interface protocol that divides incoming data streams into sub-streams with overlapping frequencies that can then be transmitted in parallel over orthogonal subcarriers [2,3]. To allow multiple accesses in OFDM , Orthogonal Frequency Division Multiple Access (OFDMA) was introduced. Relaying techniques, along with OFDMA, are used to achieve high data rate and high spectral efficiency. 1.1 Orthogonal Frequency Division Multiple Access OFDMA, an interface protocol combining features of OFDM and frequency division multiple access (FDMA)., was developed to move OFDM technology from a fixed-access wireless system to a true cellular system with mobility with same underlying technology, but more flexibility was defined in the operation of the system [1,8]. In OFDMA, subcarriers are grouped into larger units, referred to as sub-channels, and these sub-channels are further grouped into bursts which can be allocated to wireless users [4]. 1.2 Relay-Enhanced Networks In cellular systems, a way to achieve remarkable increase in data rate, but without claiming for more bandwidth, is to shrink cell sizes, however, with smaller cells more base stations (BSs) are needed to cover a same area due to which deployment and networking of new BSs acquire significant costs [5]. An alternative solution to this problem is to deploy smart relay stations (RSs), which can communication with each other and with BSs through wireless connections reducing systems cost. A relay station (RS), also called repeater or multi-hop station, is a radio system that helps to improve coverage and capacity of a base station (BS) and the resulting networks employing relay stations are sometimes called cooperative networks [6]. 1.3 Technological Requirement The continuously evolving wireless multimedia services push the telecommunication industries to set a very high data rate requirement for next generation mobile communication systems. As spectrum resource becomes very scarce and expensive, how to utilize this resource wisely to fulfil high quality user experiences is a very challenging research topic. Orthogonal frequency-division multiple access (OFDMA)-based RRM schemes together with relaying techniques allocate different portions of radio resources to different users in both the frequency and time domains and offers a promising technology for providing ubiquitous high-data-rate coverage with comparatively low cost than deploying multiple base stations [5]. Although wireless services are the demand of future due to their mobility and low cost infrastructure but along with this they suffer serious channel impairments. In particular, the channel suffers from frequency selective fading and distance dependent fading (i.e., large-scale fading) [1, 8]. While frequency selective fading results in inter-symbol-interference (ISI), large-scale fading attenuates the transmitted signal below a level at which it can be correctly decoded. Orthogonal Frequency-Division Multiple Access (OFDMA) relay-enhanced cellular network, the integration of multi-hop relaying with OFDMA infrastructure, has become one of the most promising solutions for next-generation wireless communications. 1.3.1 Frequency Selective Fading In wireless communications, the transmitted signal is typically reaching the receiver through multiple propagation paths (reflections from buildings, etc.), each having a different relative delay and amplitude. This is called multipath propagation and causes different parts of the transmitted signal spectrum to be attenuated differently, which is known as frequency-selective fading. In addition to this, due to the mobility of transmitter and/or receiver or some other time-varying characteristics of the transmission environment, the principal characteristics of the wireless channel change in time which results in time-varying fading of the received signal [9]. 1.3.2 Large Scale Fading Large scale fading is explained by the gradual loss of received signal power (since it propagates in all directions) with transmitter-receiver (T-R) separation distance. These phenomenonss cause attenuation in the signal and decrease in its power. To overcome this we use diversity and multi-hop relaying. 1.3.3 Diversity Diversity refers to a method for improving the reliability of a message signal by using two or morecommunication channelswith different characteristics. Diversity plays an important role in combatingfadingandco-channel interferenceand avoidingerror bursts. It is based on the fact that individual channels experience different levels of fading and interference. Multiple versions of the same signal may be transmitted and/or received and combined in the receiver [10]. 1.4 Proposed Simulation Model We developed a simulation model in which each user-pair is allocated dynamically a pair of relay and subcarrier in order to maximize its achievable sum-rate while satisfying the minimum rate requirement. The algorithm and the results of the simulation model are given in chapter 4. 1.5 Objectives The objective of our project is to have a detail overview of the literature regarding Orthogonal Frequency Division Multiple Access (OFDMA), Radio Resource Management (RRM) and Relaying techniques. After literature review we developed a simulation framework in which we will try to use minimum resources to get maximum throughput by using dynamic resource allocation. 1.6 Tools For the design and implementation of proposed Algorithm, we have used the following tools MATLAB Smart Draw Corel Draw 1.7 Overview Chapter 2 contains the literature review. It explains the basic principles of OFDMA, Radio Resource Management (RRM) and the relaying techniques. Chapter 3 explains the implementation of OFDM generation and reception that how an OFDM signal is generated and transmitted through the channel and how it is recovered at the receiver. Chapter 4 could be considered as the main part of thesis. It focuses on the simulation framework and the code. We have followed the paper â€Å"Subcarrier Allocation for multiuser two-way OFDMA Relay networks with Fairness Constraints†. In this section we have tried to implement the Dynamic Resource Allocation algorithm in order to achieve the maximum sum rate. Results are also discussed at the end of the end of the chapter. 2 Literature Review Introduction: First section of this Chapter gives a brief overview about OFDMA.OFDMA basically is the combination of Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Division Multiplexing Access (FDMA).OFDMA provides high data rates even through multipath fading channels. In order to understand OFDMA, we must have brief introduction to Modulation, Multiple Access, Propagation mechanisms, its effects and its impairments while using OFDMA. 2.1 Modulation Modulation is the method of mapping data with change in carrier phase, amplitude, frequency or the combination [11]. There are two types of modulation techniques named as Single Carrier Modulation (SCM) Transmission Technique or Multicarrier Modulation (MCM) Transmission Technique. [12] Single Carrier Modulation (SCM) In single carrier transmission modulation (SCM) transmission, information is modulated using adjustment of frequency, phase and amplitude of a single carrier [12]. Multi Carrier Modulation (MCM) In multicarrier modulation transmission, input bit stream is split into several parallel bit streams then each bit stream simultaneously modulates with several sub-carriers (SCs) [12]. 2.2 Multiplexing Multiplexing is the method of sharing bandwidth and resources with other data channels. Multiplexing is sending multiple signals or streams of information on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end [13]. 2.2.1 Analog Transmission In analog transmission, signals are multiplexed using frequency division multiplexing (FDM), in which the carrier bandwidth is divided into sub channels of different frequency widths,and each signal is carried at the same time in parallel. 2.2.2 Digital Transmission In digital transmission, signals are commonly multiplexed using time-division multiplexing (TDM), in which the multiple signals are carried over the same channel in alternating time slots. 2.2.3 Need for OFDMA General wireless cellular systems are multi-users systems. We have limited radio resources as limited bandwidth and limited number of channels. The radio resources must be shared among multiple users. So OFDM is a better choice in this case. OFDM is the combination of modulation and multiplexing. It may be a modulation technique if we analyze the relation between input and output signals. It may be a multiplexing technique if we analyze the output signal which is the linear sum of modulated signal. In OFDM the signal is firstly split into sub channels, modulated and then re-multiplexed to create OFDM carrier. The spacing between carriers is such that they are orthogonal to one another. Therefore there is no need of guard band between carriers. In this way we are saving the bandwidth and utilizing our resources efficiently. 2.3 Radio Propagation Mechanisms There are 3 propagation mechanisms: Reflection, Diffraction and Scattering. These 3 phenomenon cause distortion in radio signal which give rise to propagation losses and fading in signals [14]. 2.3.1 Reflection Reflection occurs when a propagating Electro-Magnetic (EM) wave impinges upon an object which has very large dimensions as compared to the wavelength of the propagating wave. Reflections occur from the surface of the earth and from buildings and walls. 2.3.2 Diffraction When the radio path between the transmitter and receiver is obstructed by a surface that has sharp irregularities (edges), diffraction occurs. The secondary waves resulting from the obstructing surface are present throughout the space and even behind the obstacle, giving rise to a bending of waves around the obstacle, even when a line-of-sight path does not exist between transmitter and receiver. At high frequencies, diffraction, like reflection, depends on the geometry of the object, as well as the amplitude, phase and polarization of the incident wave at the point of diffraction. 2.3.3 Scattering When the medium through which the wave travels consists of objects with dimensions that are small compared to the wavelength, and where the number of obstacles per unit volume is large. Scattered waves are produced by rough surfaces, small objects or by other irregularities in the channel. In practice, foliage, street signs and lamp posts produce scattering in a mobile radio communications system. 2.4 Effects of Radio Propagation Mechanisms The three basic propagation mechanisms namely reflection, diffraction and scattering as we have explained above affect on the signal as it passes through the channel. These three radio propagation phenomena can usually be distinguished as large-scale path loss, shadowing and multipath fading [14][15]. 2.4.1 Path Loss Path Lossis the attenuation occurring by an electromagnetic wave in transit from a transmitter to a receiver in a telecommunication system. In simple words, it governs the deterministic attenuation power depending only upon the distance between two communicating entities. It is considered as large scale fading because it does not change rapidly. 2.4.2 Shadowing Shadowingis the result of movement of transmitter, receiver or any channel component referred to as (obstacles). Shadowing is a statistical parameter. Shadowing follows a log-normal distribution about the values governed by path loss. Although shadowing depends heavily upon the channel conditions and density of obstacles in the channel, it is also normally considered a large scale fading component alongside path loss. 2.4.3 Multipath Fading Multipath Fadingis the result of multiple propagation paths which are created by reflection, diffraction and scattering. When channel has multiple paths. Each of the paths created due to these mechanisms may have its characteristic power, delay and phase. So receiver will be receiving a large number of replicas of initially transmitted signal at each instant of time. The summation of these signals at receiver may cause constructive or destructive interferences depending upon the delays and phases of multiple signals. Due to its fast characteristic nature, multipath fading is called small scale fading. 2.5 Orthogonal Frequency Division Multiplexing (OFDM) Orthogonal Frequency Division Multiplexing (OFDM) is an efficient multicarrier modulation that is robust to multi-path radio channel impairments [15]. Now-a-days it is widely accepted that OFDM is the most promising scheme in future high data-rate broadband wireless communication systems. OFDM is a special case of MCM transmission. In OFDM, high data rate input bit stream or data is first converted into several parallel bit stream, than each low rate bit stream is modulated with subcarrier. The several subcarriers are closely spaced. However being orthogonal they do not interfere with each other. 2.5.1 Orthognality Signals are orthogonal if they are mutually independent of each other. Orthogonality is a property that allows multiple information signals to be transmitted perfectly over a common channel and detected, without interference. Loss of orthogonality results in blurring between these information signals and degradation in communications. Many common multiplexing schemes are inherently orthogonal. The term OFDM has been reserved for a special form of FDM. The subcarriers in an OFDM signal are spaced as close as is theoretically possible while maintain orthogonality between them.In FDM there needs a guard band between channels to avoid interference between channels. The addition of guard band between channels greatly reduces the spectral efficiency. In OFDM, it was required to arrange sub carriers in such a way that the side band of each sub carrier overlap and signal is received without interference. The sub-carriers (SCs) must be orthogonal to each other, which eliminates the guard band and improves the spectral efficiency . 2.5.2 Conditions of orthogonality 2.5.2.1 Orthogonal Vectors Vectors A and B are two different vectors, they are said to be orthogonal if their dot product is zero 2.6 OFDM GENERATION AND RECEPTION OFDM signals are typically generated digitally due to the complexity of implementation in the analog domain. The transmission side is used to transmit digital data by mapping the subcarrier amplitude and phase. It then transforms this spectral representation of the data into the time domain using an Inverse Discrete Fourier Transform (IDFT) but due to much more computational efficiency in Inverse Fast Fourier Transform (IFFT), IFFT is used in all practical systems. The receiver side performs the reverse operations of the transmission side, mixing the RF signal to base band for processing, and then a Fast Fourier Transform (FFT) is employed to analyze the signal in the frequency domain. The demodulation of the frequency domain signal is then performed in order to obtain the transmitted digital data. The IFFT and the FFT are complementary function and the most suitable term depends on whether the signal is being recovered or transmitted but the cases where the signal is independent of this distinction then these terms can be used interchangeably [15]. 2.6.1 OFDM Block Diagram 2.6.2 Implementation of OFDM Block Diagram 2.6.2.1 Serial to Parallel Conversion: In an OFDM system, each channel can be broken down into number of sub-carriers. The use of sub-carriers can help to increase the spectral efficiency but requires additional processing by the transmitter and receiver which is necessary to convert a serial bit stream into several parallel bit streams to be divided among the individual carriers. This makes the processing faster as well as is used for mapping symbols on sub-carriers. 2.6.2.2 Modulation of Data: Once the bit stream has been divided among the individual sub-carriers by the use of serial to parallel converter, each sub-carrier is modulated using 16 QAM scheme as if it was an individual channel before all channels are combined back together and transmitted as a whole. 2.6.2.3 Inverse Fourier Transform: The role of the IFFT is to modulate each sub-channel onto the appropriate carrier thus after the required spectrum is worked out, an inverse Fourier transform is used to find the corresponding time domain waveform. 2.6.2.4 Parallel to Serial Conversion: Once the inverse Fourier transform has been done each symbol must be combined together and then transmitted as one signal. Thus, the parallel to serial conversion stage is the process of summing all sub-carriers and combining them into one signal 2.6.2.5 Channel: The OFDM signal is then transmitted over a channel with AWGN having SNR of 10 dB. 2.6.2.6 Receiver: The receiver basically does the reverse operations to the transmitter. The FFT of each symbol is taken to find the original transmitted spectrum. The phase angle of each transmission carrier is then evaluated and converted back to the data word by demodulating the received phase. The data words are then combined back to the same word size as the original data. 2.7 OFDMA in a broader perspective OFDM is a modulation scheme that allows digital data to be efficiently and reliably transmitted over a radio channel, even in multipath environments [17]. OFDM transmits data by using a large number of narrow bandwidth carriers. These carriers are regularly spaced in frequency, forming a block of spectrum. The frequency spacing and time synchronization of the carriers is chosen in such a way that the carriers are orthogonal, meaning that they do not interfere with each other. This is despite the carriers overlapping each other in the frequency domain [18]. The name ‘OFDM is derived from the fact that the digital data is sent using many carriers, each of a different frequency (Frequency Division Multiplexing) and these carriers are orthogonal to each other [19]. 2.7.1 History of OFDMA The origins of OFDM development started in the late 1950s with the introduction of Frequency Division Multiplexing (FDM) for data communications. In 1966 Chang patented the structure of OFDM and published the concept of using orthogonal overlapping multi-tone signals for data communications. In 1971 Weinstein introduced the idea of using a Discrete Fourier Transform (DFT) for Implementation of the generation and reception of OFDM signals, eliminating the requirement for banks of analog subcarrier oscillators. This presented an opportunity for an easy implementation of OFDM, especially with the use of Fast Fourier Transforms (FFT), which are an efficient implementation of the DFT. This suggested that the easiest implementation of OFDM is with the use of Digital Signal Processing (DSP), which can implement FFT algorithms. It is only recently that the advances in integrated circuit technology have made the implementation of OFDM cost effective. The reliance on DSP prevented the wide spread use of OFDM during the early development of OFDM. It wasnt until the late 1980s that work began on the development of OFDM for commercial use, with the introduction of the Digital Audio Broadcasting (DAB) system. 2.7.2 Advantages using OFDMA There are some advantages using OFDMA. OFDM is a highly bandwidth efficient scheme because different sub-carriers are orthogonal but they are overlapping. Flexible and can be made adaptive; different modulation schemes for subcarriers, bit loading, adaptable bandwidth/data rates possible. Has excellent ICI performance because of addition of cyclic prefix. In OFDM equalization is performed in frequency domain which becomes very easy as compared to the time domain equalization. Very good at mitigating the effects of delay spread. Due to the use of many sub-carriers, the symbol duration on the sub-carriers is increased, relative to delay spread. ISI is avoided through the use of guard interval. Resistant to frequency selective fading as compared to single carrier system. Used for high data rate transmission. OFDMA provides flexibility of deployment across a variety of frequency bands with little need for modification is of paramount importance. A single frequency network can be used to provide excellent coverage and good frequency re-use. OFDMA offers frequency diversity by spreading the carriers all over the used spectrum. 2.7.3 Challenges using OFDMA These are the difficulties we have to face while using OFDMA [20][21][22], The OFDM signal suffers from a very high peak to average power ratio (PAPR) therefore it requires transmitter RF power amplifiers to be sufficiently linear in the range of high input power. Sensitive to carrier frequency offset, needs frequency offset correction in the receiver. Sensitive to oscillator phase noise, clean and stable oscillator required. The use of guard interval to mitigate ISI affects the bandwidth efficiency. OFDM is sensitive to Doppler shift frequency errors offset the receiver and if not corrected the orthogonality between the carriers is degraded. If only a few carriers are assigned to each user the resistance to selective fading will be degraded or lost. It has a relatively high sensitivity to frequency offsets as this degrades the orthogonality between the carriers. It is sensitive to phase noise on the oscillators as this degrades the orthogonaility between the carriers. 2.7.4 Comparison with CDMA in terms of benefits 2.7.4.2 CDMA Advantages: CDMA has some advantages over OFDMA [22], Not as complicated to implement as OFDM based systems. As CDMA has a wide bandwidth, it is difficult to equalise the overall spectrum significant levels of processing would be needed for this as it consists of a continuous signal and not discrete carriers. Not as easy to aggregate spectrum as for OFDM. 2.7.5 OFDMA in the Real World: UMTS, the European standard for the 3G cellular mobile communications, and IEEE 802.16, a broadband wireless access standard for metropolitan area networks (MAN), are two live examples for industrial support of OFDMA. Table 1 shows the basic parameters of these two systems. Table 1. OFDMA system parameters in the UMTS and IEEE 802.16 standards 2.8 Radio Resource Management In second section of this chapter we will discuss radio resource management schemes, why we need them and how they improve the efficiency of the network. Radio resource management is the system level control of co-channel interference and other radio transmission characteristics in wireless communication systems. Radio resource management involves algorithms and strategies for controlling parameters such as Transmit power Sub carrier allocation Data rates Handover criteria Modulation scheme Error coding scheme, etc 2.8.1 Study of Radio Resource Management End-to-end reconfigurability has a strong impact on all aspects of the system, ranging from the terminal, to the air interface, up to the network side. Future network architectures must be flexible enough to support scalability as well as reconfigurable network elements, in order to provide the best possible resource management solutions in hand with cost effective network deployment. The ultimate aim is to increase spectrum efficiency through the use of more flexible spectrum allocation and radio resource management schemes, although suitable load balancing mechanisms are also desirable to maximize system capacity, to optimize QoS provision, and to increase spectrum efficiency. Once in place, mobile users will benefit from this by being able to access required services when and where needed, at an affordable cost. From an engineering point of view, the best possible solution can only be achieved when elements of the radio network are properly configured and suitable radio resource m anagement approaches/algorithms are applied. In other words, the efficient management of the whole reconfiguration decision process is necessary, in order to exploit the advantages provided by reconfigurability. For this purpose, future mobile radio networks must meet the challenge of providing higher quality of service through supporting increased mobility and throughput of multimedia services, even considering scarcity of spectrum resources. Although the size of frequency spectrum physically limits the capacity of radio networks, effective solutions to increase spectrum efficiency can optimize usage of available capacity. Through inspecting the needs of relevant participants in a mobile communication system, i.e., the Terminal, User, Service and Network, effective solutions can be used to define the communication configuration between the Terminal and Network, dependent on the requirements of Services demanded by Users. In other words, it is necessary to identify proper communications mechanisms between communications apparatus, based on the characteristics of users and their services. This raises further questions about how to manage traffic in heterogeneous networks in an efficient way. 2.8.2 Methods of RRM 2.8.2.1 Network based functions Admission control (AC) Load control (LC) Packet scheduler (PS) Resource Manager (RM) Admission control In the decision procedure AC will use threshold form network planning and from Interference measurements. The new connection should not impact the planned coverage and quality of existing Connections. (During the whole connection time.) AC estimates the UL and DL load increase which new connection would produce. AC uses load information from LC and PC. Load change depends on attributes of RAB: traffic and quality parameters. If UL or DL limit threshold is exceeded the RAB is not admitted. AC derives the transmitted bit rate, processing gain, Radio link initial quality parameters, target BER, BLER, Eb/No, SIR target. AC manages the bearer mapping The L1 parameters to be used during the call. AC initiates the forced call release, forced inter-frequency or intersystem handover. Load control Reason of load control Optimize the capacity of a cell and prevent overload The interference main resource criteria. LC measures continuously UL and DL interference. RRM acts based on the measurements and parameters from planning Preventive load control In normal conditions LC takes care that the network is not overloaded and remains Stable. Overload condition . LC is responsible for reducing the load and bringing the network back into operating area. Fast LC actions in BTS Lower SIR target for the uplink inner-loop PC. LC actions located in the RNC. Interact with PS and throttle back packet data traffic. Lower bit rates of RT users.(speech service or CS data). WCDMA interfrequency or GSM intersystem handover. Drop single calls in a controlled manner. 2.8.2.3 Connection based functions Handover Control (HC) Power Control (PC) Power control Uplink open loop power control. Downlink open loop power control. Power in downlink common channels. Uplink inner (closed) loop power control. Downlink inner (closed) loop power control. Outer loop power control. Power control in compressed mode. Handover Intersystem handover. Intrafrequency handover. Interfrequency handover. Intersystem handover. Hard handover (HHO). All the old radio links of an MS are released before the new radio links are established. Soft handover (SHO) SMS is simultaneously controlled by two or more cells belonging to different BTS of the same RNC or to different RNC. MS is controlled by at least two cells under one BTS. Mobile evaluated handover (MEHO) The UE mai