Admission control for VoIP calls with heterogeneous codecs
WOCC'09 Proceedings of the 18th international conference on Wireless and Optical Communications Conference
Efficient downlink scheduling with power boosting in mobile IEEE 802.16 networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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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.