Discretionary bandwidth granting scheme for homogenous real-time applications
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RESEARCH
Open Access
Discretionary bandwidth granting scheme for homogenous real-time applications Kuokkwee Wee1*, Mardeni R2, S W Tan2 and S W Lee2
Abstract IEEE 802.16e is an advanced wireless access technology that provides high-speed data transmission in long distance and offers quality of service (QoS) to subscribers. The provisioning of QoS is one of the great features by IEEE 802.16 to support both real-time and non-real-time applications. In IEEE 802.16, the common part sublayer in the MAC layer is responsible for maintaining the QoS services. There are many functions in the common part sublayer; the most popular topics discussed by researchers are the uplink and downlink scheduling algorithms. Many discussions had been made and focused on these two classes of schedulers. Another equally important component but overlooked so far is the bandwidth request and grant module. Bandwidth request and grant module arbitrates the amount of bandwidth to be granted, besides handling the bandwidth requests. This bandwidth request and grant process has always been developed in a conventional way, and its importance has been underestimated. In addition, the bandwidth distribution within a same service class or category also attracted little attention thus far. Many algorithms for interclass scheduling have been studied and proposed but not as much for intraclass scheduling. However, in bandwidth request and grant process, constraints on the required knowledge by the schedulers limit the intraclass scheduling algorithms to be applied onto them. We view the bandwidth request and grant process as an important part of the QoS architecture. In this paper, we proposed a new bandwidth granting scheme for the bandwidth request and granting process, which enables bandwidth to be fairly granted based on the necessity to all the requests from the same service class or category. By applying our scheme, significant improvements have been observed and recorded. Experiment results have proven and confirmed the effectiveness of our proposed scheme as compared to the conventional scheme. Keywords: Broadband wireless access networks, Bandwidth control, IEEE 802.16, Quality of service, WiMAX, Scheduling, Bandwidth request and grant
1. Introduction IEEE 802.16 is a set of standards for broadband wireless access (BWA). It was established in 1999 with the aim to deploy broadband wireless metropolitan area networks (WMAN) worldwide. It is aimed to deliver high-speed data services with QoS and prominent security features in several large geographical areas. Today, IEEE 802.16e has been widely deployed to extend the network penetration and coverage where other wired technologies are not available or too costly to be installed. The WMAN specifications are defined in IEEE standard 802.16-2009 [1]. This new release supersedes the previous IEEE standard 802.16-2001 [2] which defines the * Correspondence: [email protected] 1 Faculty of Information Science & Technology, Multimedia University, Jalan Ayer Keroh Lama, Bukit Beruang, Melaka 7545
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