Cross-layer Packet Scheduling Framework with QoS Mapping for Real-time Video in CSMA/CA Based Networks  

作　　者：XIAO Hongjiang DAI Qionghai 

机构地区：[1]Department of Automation, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Journal of Electronics》2009年第2期285-290,共6页电子学报（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China （No.60432030, No.60721003, No.60772055） and 863 Program （No. 2007AA01Z332）.

摘　　要：This paper proposes a cross-layer packet scheduling framework with QoS （Quality of service） mapping to provide UEP （Unequal error protection） at both application and MAC （Medium access control） layers by investigating the CSMA/CA （Carrier sense multiple access with Collision avoidance） protocol from the queue theory. We take full advantage of the rate-adjustability of shortened-and-punctured RS （ReedSolomon） codes, and discuss three essential aspects of the framework： the packet loss probability under both FEC （Forward error correction） and delay constraint, the mapping mechanism from packets loss distortion to retransmission limit, and the congestion-aware scheduling algorithm. Besides, a reservation factor for queue space is introduced to restrain the negative effect of burst behavior of the parity packets. Simulation results indicate that the performance of our scheme is superior to the conventional methods.

关 键 词：CSMA/CA Cross-layer scheduling QoS mapping Delay constraint VIDEO 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] O189.11[自动化与计算机技术—计算机科学与技术]