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With growing demand for wireless multimedia services and continuing emergence of new multimedia applications, it is necessary for the network to provide various levels of QoS while maximising the utilization of channel resources. This paper presents an adaptive queueing model and a novel cross-layer packet scheduling algorithm for providing differentiated QoS and effective channel utilization in a SDMA/TDMA system. At the MAC layer, we take consideration of the heterogeneous and busty nature of multimedia traffic and provide for QoS requirements. At the PHY layer, we exploit the randomness of the physical channel by incorporating opportunistic scheduling and adopting adaptive modulation and coding (AMC). Performance results obtained by simulations show that by employing the proposed queueing model and packet scheduling algorithm, the system is able to provide for diverse QoS and achieve high throughput.
Mobile communication systems, Algorithm/protocol design and analysis, Architectures, Mobile environments, Support services

J. T. Ho, "QoS-, Queue-, and Channel-Aware Packet Scheduling for Multimedia Services in Multiuser SDMA/TDMA Wireless Systems," in IEEE Transactions on Mobile Computing, vol. 7, no. , pp. 751-763, 2007.
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