標題: Highest Urgency First (HUF): A latency and modulation aware bandwidth allocation algorithm for WiMAX base stations
作者: Lin, Yi-Neng
Lin, Ying-Dar
Lai, Yuan-Cheng
Wu, Che-Wen
交大名義發表
National Chiao Tung University
關鍵字: WiMAX;Bandwidth allocation;Algorithm;Latency;Modulation
公開日期: 12-Feb-2009
摘要: The mobile WiMAX systems based on IEEE 802.16e-2005 provide high data rate for mobile wireless networks. However, the link quality is frequently unstable owing to mobility and air interference and therefore impacts the latency requirement of real-time applications. In the WiMAX standard, the modulation/coding scheme and the boundary of uplink/downlink sub-frames could be adjusted subject to channel quality and the traffic volume, respectively. This provides us a chance to design a MAC-layer uplink/downlink bandwidth allocation algorithm that is QoS/PHY-aware. This work takes into account the adaptive modulation and coding scheme (MCS), uplink and downlink traffic volume, and QoS parameters of all five defined service classes to design a bandwidth allocation algorithm that calculates the slot allocation in two phases. The first phase decides the boundary of uplink and downlink sub-frames by satisfying requests with pending latency violation and proportionating according to traffic volume, while the second phase allocates slots to mobile stations considering urgency, priority and fairness. Simulation results show our algorithm achieves zero latency violation and higher system throughput compared to existing non-QoS/PHY-aware or less-QOS/PHY-aware approaches. (C) 2008 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.comcom.2008.11.003
http://hdl.handle.net/11536/7635
ISSN: 0140-3664
DOI: 10.1016/j.comcom.2008.11.003
期刊: COMPUTER COMMUNICATIONS
Volume: 32
Issue: 2
起始頁: 332
結束頁: 342
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