This website uses cookies to ensure you have the best experience. Learn more

Improving The Obss Problem Essay

1932 words - 8 pages

Wireless LANs have expanded greatly and rapidly in recent years. The expansio¬¬¬¬¬n has caused many benefits to the end users but at the same time it has introduced problem of overlapping BSS (Basic Service Set) where BSS (i.e. WLAN cells) is fundamental block of IEEE 802.11 WLAN architecture. OBSS occurs due to two or more unrelated BSSs are used at the same place, at the same time and with the same frequency channel. With the expansion of channel bandwidth to 80 MHz (may be, 160 MHz) in upcoming standards, the OBSS problem is likely to be very severe in the future. This paper examines how OBSS can be harmful to the networks and how it can be avoided using beam forming, distributed coordination across different APs, and power management. At the end, this text explores the effectiveness of the proposed solutions.
Wireless Local Area Network (WLAN) is one of the most successful technologies in IEEE 802.XX standards family. WLAN provides free connectivity, mobility, and flexibility with a relatively low cost for users. The widespread use of WLAN technology in streaming videos and voice applications stimulated high bandwidth capacity for WLANs. Recently IEEE has announced latest WLAN standard 802.11ac. For 802.11ac to be effective, it requires minimum 80 MHz wide channel with optionally up to 160 MHz. The increase in bandwidth leads to problems like OBSS. OBSS problem occur when two or more BSSs operate in same channel and are close to hear each other. This is an undesirable situation where two or more BSSs compete for channel access and increase contention which ultimately degrades performance/efficiency of the WLAN system [1]. The problem was not critical with 802.11a/b/g/n where the channel bandwidth was reasonable. OBSS problem will grow bigger with increase in channel bandwidth in latest standards, expansion of devices, and lack of available spectrum.
The objective of intentional OBSS is to facilitate sharing of the medium between BSSs so that they can hear each other’s beacons. But due to large channel bandwidths and lack of spectrum, many a times OBSS have to use the same channel as their neighbors. The problem becomes intense when there are many OBSS using the same channel. The wide range WLAN usage has caused “tragedy of commons” problem especially at public places. OBSS cause problems such as low efficiency, higher congestion and low data rate. OBSS is a problem for 802.11 when it is intended to use for applications which require QoS. EDCA does not solve this problem as it does not require other BSSs to coordinate. Admission control only solves bandwidth allocation problem within a single network and does not address OBSS [2].
A number of solutions have been recommended in the past up to today to reduce potential interference due to OBSS problem. Frequency channel assignment can be a solution where BSS, during initial setup, scans the area to avoid channels that are already being used at other...

Find Another Essay On Improving the OBSS problem

English as a Universal Language Essay

1327 words - 6 pages factors influencing their success or failure in learning the language.” When studying English, youth might face a lot of different problems like environment problem, financial problem and so on. Motivation can help one to keep going despite the problems. If one keeps the motivation high and their eyes on the goal, no problem will seem insuperable. Besides that, attitude of youth towards improving English language also important. Youth must keep a clear

Analytical Skills: The Secret to a Lawyer's Success

668 words - 3 pages , or coherence between pieces of information. The helps eliminate the problem of irrelevance and discussing moot topics. Every legal advocate faces the challenges of creating order out of chaos. Lawyers should approach cases with logic and always question relevance. Students pursuing law careers who neglect improving their analytical skills are setting themselves up for failure. Such failures include issues with improperly interpreting laws

Assignment # 1

681 words - 3 pages , the easier the conflict can be resolved. The next step is to think outside the box in regard to the problem or to look beyond the incident. This involves establishing the origin of the conflict, it could be a small issue that happened years before, but the stress level has developed to the point where the parties involved have begun to attack one another individually rather than dealing with the real issue. The third step request solutions from the

Kurdistan's biggest problem?

518 words - 2 pages Soma SardarApril 11, 2014What do you think is Kurdistan's biggest problem?Just like any other country, Kurdistan faces many problems. These problems include poverty, starvation, illiteracy, terrorism, job crisis, and many more. In this essay, I will discuss 3 major problems Kurdistan is home to; the first of which is illiteracy/lack of education, the fact that everyone is able to run for parliament, and shortage of income.The first problem I

Kurdistan's biggest problem

518 words - 2 pages Soma SardarApril 11, 2014What do you think is Kurdistan's biggest problem?Just like any other country, Kurdistan faces many problems. These problems include poverty, starvation, illiteracy, terrorism, job crisis, and many more. In this essay, I will discuss 3 major problems Kurdistan is home to; the first of which is illiteracy/lack of education, the fact that everyone is able to run for parliament, and shortage of income.The first problem I

Solving the Worlds Water Problem

759 words - 4 pages improved?” One problem to improving such systems is that the cost is exorbitant. Even though improving is expensive, China has managed to get enough donations for 200 plus projects in progress on improving desalination. Because of this, the amount of water desalinated per day is multiplying greatly. The main research facility is a water purification plant called “El Paso”. It is located in Texas and is the largest inland water purification plant

Nature of Line Balancing

518 words - 2 pages performed in a feasible sequence and approximately equal amounts of time are required at each of the work stations. This study focuses on improving overall efficiency of assembly line by reducing the non-value added activities, cycle time and distribution of work load at each work station by line balancing.Line balancing is the problem of assigning operation to workstation along an assembly line, in such a way that assignment is optimal in some sense

Malaysian Airlines report

1825 words - 7 pages few hours in order not to get the problem again.Call the ambulance if the condition is not improving. First Aid Tips on Poisoning:A poison is the substance which leads to the body damage. General examples of poisoning include taking sleeping pills in large amounts, industrial products like pesticides, using the sprays and the household cleaning products.Signs and Symptoms of Poisoning:Going into unconscious state.Burns around or in the

Total Mgt

288 words - 2 pages is a major element for our project as to empower employees by provide training specialist thus improving the quality of the services and quicker service time; continuous improvement, out banks customer specialist are use for continuous good performance, as every specialists needs understanding of their customers, so that next time when customers comes in we know what they may looking for (not repeating introducing the service that existing

Urban Planning

607 words - 3 pages Which urban planning strategies would be most effective in improving health in developing countries? Provide explanations, relevant evidence and specific examples to support your reasoning. Urbanization is now increasing in the world especially in developing countries. This causes lots of effect on citizens’ health which is the heart of the ‘standard of living’ in the 19th century (Leon, 2007). Moreover, different strategies are required to


1580 words - 7 pages with the family by identifying the problems and improving the behavior with and strategic therapy works with changing the client behavior to improve the problem. Both, structural and strategic therapy has goals toward assisting the clients. Structural approach goals is to “alter the dysfunctional structure to promote problem solving and to facilitate the growth of the system to resolve symptoms and encourage growth in individuals, while also

Similar Essays

Shell's Communication Plan Essay

3396 words - 14 pages example, a high price may symbolize and communicate quality to customers, as may various other aspects of the marketing program such as the shape or design of a product, its packaging, brand name, or the image of the stores in which it is sold. Problem Definition Like we have mentioned above Shell is about to introduce to the market its "New Improved" petrol. What we have to do, as an advertising agency is to create a message by creating and

Effective Team Essay

332 words - 2 pages tend to lead or direct the group hence improving our leading skill. Involvement in team creates different innovative approach to solve a problem, analysis of an aspect from various mindsets and introduction of more amount of information which is essential for organizational effectiveness.We know a team is effective whenMembers become more effective working in together than alone.Team members clearly understand the leadership authority and decision

Proble Solving: Obtain System Essay

1375 words - 6 pages management team could focus on the internal and externals factors impacting the organization. The decline in sales external influences are the clients, the organizations competition and possible the economy. The internal focuses are on improving the staff and staff product knowledge. Test the Hypothesis The third step in the OBTAIN problem solving process is to test the hypothesis. This process is broken apart into four phases. These phases are

Solving Problem Essay

3061 words - 12 pages -proofing (Poka-yoke) 1. Introduction Quality now plays an important role the strategy of organization. Increasing the customers' satisfaction has proved the target of TQM. Most of the organizations are seeking the way to achieve the target. And recent years, the people in TQM have been recognized as the key factor of success to improve the organization performance. The structure problem solving is most useful way to continuant improving the performance