Indian Journal of Science and Technology

Abstract

Objectives: To enhance the performance of EDCF for the higher priority traffic under heavy load condition by providing higher throughput to provide desired QoS. To achieve this, we propose a method called Priority Station Based Queuing (PSBQ). An enhancement called as The IEEE 802.11e Enhanced Distributed Coordination Function (EDCF) has been developed to fulfill the growing need for the Quality of Service (QoS) in IEEE 802.11. Methods/Statistical Analysis: In EDCF standard the prioritization applies to the stations based on First in First Out approach (FIFO). Here, the size of the contention window size is reset according to the static equation after successful transmission for each traffic class, resulting in the degradation of the performance. So, we proposed our PSBQ which is the modified version of the already existing mechanism known as PRED, which applies the priority to the stations based on Random Early Detection (RED) instead of FIFO in EDCF Mechanism. Finding: In our approach to enhance the throughput of high priority traffic class, a priority is obtained by to the station based on Adaptive Random Early Detection (ARED), which is an Active Queuing mechanism and tuning was perform. On the parameter of the PSBQ, according to the network conditions and lastly the revision of the contention window adjustment is applied dynamically. Application/Improvements: Simulations was performed using the OpnetSimulator to evaluate its performance and found the results to be better in achieving prioritized, good service differentiation regarding throughput for higher priority traffic class under heavy load conditions to provide a desirable QoS.

Keywords: Collision, Enhanced Distributed Coordination Function, Priority Station based Queuing Algorithm, Quality of Service, Throughput, Wireless Network