Abstract
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.
Highlights
IEEE 802.16 is a set of standards for broadband wireless access (BWA)
Our objective is to propose an efficient algorithm in bandwidth request and grant process which is often overlooked by many researchers
Scenario 2: mixture of 16 quadrature amplitude modulations (QAM) and 64 QAM modulated subscriber station (SS) We evaluate the performance of SDBG scheme, round robin (RR) scheduling scheme, and unregulated bandwidth control (URBC) approach in a scenario where the SSs are stationed in a combination of different modulation schemes
Summary
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. WCC microengine does not provide any factor point to bandwidth request and grant manager, but it assists in maintaining the network hierarchy and QoS structure from the channel condition perspective. BW microengine does not reserve bandwidth for a SS based on the information gathered from its submodules, but it calculates the factor points which is needed by bandwidth request and grant manager in bandwidth granting process. In order to maintain the network hierarchy structure and provision of QoS, our bandwidth request and grant manager always tend to allocate maximum bandwidth for the better channel conditioned SSs. By doing this, the maximum throughput of a network could be retained. Our proposed SDBG scheme is targeting on homogenous real-time traffic with bandwidth request mechanism and the bandwidth resource management for the same service class or category. All SSs are located close to the BS with 64 QAM 3/4
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