Resource allocation algorithm with cross-layer design for DiffServ-based OFDM systems  

作　　者：LI Xiao-hui HAN Ming YI Ke-chu TIAN Bin 

机构地区：[1]Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2007年第2期45-50,共6页中国邮电高校学报（英文版）

摘　　要：According to the quality of service （QoS） requirements of differentiated service （DiffServ）, a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing （OFDM） systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued （WFQ） algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.According to the quality of service （QoS） requirements of differentiated service （DiffServ）, a cross-layer resource allocation algorithm for multi-user orthogonal frequency division multiplexing （OFDM） systems is presented. The constant rate is maintained by adjusting the power dynamically for the voice traffics with high priority, whereas the fairness amongst the data traffics is guaranteed by weighted fairness queued （WFQ） algorithm. The two above-mentioned strategies are used for video traffics to realize variable data rate with the constraint of the minimum rate. Combing all these methods, both the throughput and the fairness are ensured when there are multiple users in the OFDM system. Simulation results indicate the validity of the proposed algorithm, which can work well even if the SNR is less than 0 dB.

关 键 词：OFDM CROSS-LAYER QOS DIFFSERV 

分 类 号：TN925[电子电信—通信与信息系统]