Cross-Layer MAC Protocol and Holistic Opportunistic Scheduling with Adaptive Power Control for QoS in WiMAX |
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Authors: | Jinchang Lu Maode Ma |
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Affiliation: | (1) Signal Theory and Communications Department, Technical University of Catalonia (UPC), Barcelona, Spain;(2) Telecommunications Technological Centre of Catalonia (CTTC), Barcelona, Spain |
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Abstract: | Providing quality of service (QoS) to different service classes with integrated real-time and non-real-time traffic is an
important issue in broadband wireless access networks. Opportunistic MAC (OMAC) is a novel view of communication over spatiotemporally
varying wireless link whereby the multi-user diversity is exploited rather than combated to maximize bandwidth efficiency
or system throughput. It combines cross-layer design features and opportunistic scheduling scheme to achieve high utilization
while providing QoS support to various applications. Channel characteristics, traffic characteristics and queue characteristics
are the essential factors in the design of opportunistic scheduling algorithms. In this paper, we propose a cross-layer MAC
scheduling framework in WiMAX point-to-multipoint (PMP) systems and a corresponding opportunistic scheduling algorithm with
an adaptive power control scheme to provide QoS support to the heterogeneous traffic. Extensive simulation experiments have
been carried out to evaluate the performance of our proposal. The simulation results show that our proposed solution can improve
the performance of the WiMAX PMP systems in terms of packet loss rate, packet delay and system throughput. |
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Keywords: | |
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