A simulation study of service differentiation for the bandwidth request scheme in fixed IEEE 802.16 network |
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| Authors: | Yi Zhou Kai-yue Qi Jian-bo Chen Kai Chen Jian-hua He |
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| Institution: | (1) School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai, 200240, China;(2) School of Information Security Engineering, Shanghai Jiaotong University, Shanghai, 200240, China;(3) Institute of Advanced Telecommunications, Swansea University, Swansea, UK |
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| Abstract: | Various flexible mechanisms related to quality of service (QoS) provisioning have been specified for uplink traffic at the
medium access control (MAC) layer in the IEEE 802.16 standards. Among the mechanisms, contention based bandwidth request scheme
can be used to indicate bandwidth demands to the base station for the non-real-time polling and best-effort services. These
two services are used for most applications with unknown traffic characteristics. Due to the diverse QoS requirements of those
applications, service differentiation (SD) is anticipated over the contention based bandwidth request scheme. In this paper
we investigate the SD with the bandwidth request scheme by means of assigning different channel access parameters and bandwidth
allocation priorities at different packets arrival probability. The effectiveness of the differentiation schemes is evaluated
by simulations. It is observed that the initial backoff window can be efficient in SD, and if combined with the bandwidth
allocation priority, the SD performances will be better.
Foundation item: the National Basic Research Program (973) of China (No. 2005C13321804) |
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| Keywords: | IEEE 802 16 WiMAX medium access control (MAC) service differentiation |
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