Evaluation of starvation problem under saturated loads in IEEE 802.11e

摘要

In Recent times, real time applications are increasing gradually which have specific Quality of Service (QoS) requirements. IEEE 802.11e is aimed to provide such QoS. 802.11e uses traffics differentiation among flows using a parameter set. The flows are admitted using their priority. The voice and video flows are admitted in most of the times due to their higher priority. This causes the increase in delay of lower priority flows such as Best Effort (BE) and Back Ground (BK). In this paper we evaluated the performance of 802.11e for voice, video BE and BK under saturated loads. The QoS parameters throughput, transmission delay, jitter and number of sent packets is calculated. Less throughput, higher delay and jitter are observed for BE and BK. Number of sent packets are also less. From the results, it is observed that the traffics BE and BK are starved by voice and video. Simulations and experimental analysis have been conducted under saturated loads using ns2.35.