Abstract
In recent years, there has been an increase in the transmission of multimedia services due to the emergence of wireless broadband (WiBB) technologies such as WiMAX. WiMAX supports multiple QoS classes for transmission of different multimedia applications. However, satisfying the requirements of these applications with the often-limited resources has been a major challenge, which requires an efficient scheduling scheme such as PLAS. PLAS is a variant of LAWRR designed to reduce queuing delay of real-time traffics in WiBB networks. Several simulation experiments were conducted to evaluate the performance of PLAS against the LAWRR algorithm. The results revealed that PLAS outperforms the other scheme in terms of average delay for low input traffic. However, the metric (delay) used and the traffics generated for the simulation are not adequate to realistically evaluate the performance of a scheduling algorithm in a typical metropolitan area network. In this study, we further evaluated the performance of PLAS and LAWRR under varying higher input traffics, and an additional performance metric, using discrete event simulation. The results demonstrated that the PLAS achieved better results in terms of queuing delay and throughput compared to LAWRR. The improved performance will lead to better user experience, which will increase the number of subscribers and consequently increase revenue for service providers.
Highlights
Wireless broadband (WiBB) technology have undergone tremendous advancement which has led to increased demand for high speed transmission of multimedia services over long distances
The performance of the Priority Load-Aware Scheduling (PLAS) algorithm was evaluated against load-aware weighted round-robin (LAWRR) only in terms of average delay under varying network sizes of 5,10,15,20,25,30 and 35 Subscriber Stations (SSs), and the results revealed that PLAS outperforms LAWRR
PLAS reduces delay by about 69.6% for UGS and about 74.5 % for rtPS
Summary
Wireless broadband (WiBB) technology have undergone tremendous advancement which has led to increased demand for high speed transmission of multimedia services over long distances. The applications supported by this service are delay tolerant, require minimum bandwidth and consists of variable-sized data packets. BE class supports for applications such as Hypertext Transport Protocol (HTTP) and electronic mail (e-mail), that do not require QoS guarantee These applications are defined by their need for maximum sustained traffic rate, traffic priority and request/transmission policy [3][6 - 8]. Each of these classes has unique QoS requirement in terms of delay, jitter, throughput and packet loss. We present performance evaluation of PLAS against LAWRR in terms of average delay and throughput under more bursty traffics environment.
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