有限反馈中继系统基于业务速率的跨层调度算法
doi: 10.3724/SP.J.1146.2011.00163
A Novel Method of Feedback Reducing and Cross-layer Scheduling Based on Traffic Rate for Relay System
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摘要: 针对正交频分复用(OFDM)中继系统中用户不同业务速率需求的应用场景，该文提出了一种基于用户业务速率的反馈机制(Considering Traffic Rate Feedback, CTRF)。CTRF根据业务速率动态调整用户的反馈效用函数值，并与反馈门限比较判决用户是否反馈，从而减少系统的反馈量。同时，提出了一种基于业务队列公平性(Traffic Queue Proportional Fair, TQPF)的跨层调度准则。在此基础上，给出了一种联合CTRF与TQPF的支持不同业务速率的减少反馈调度算法(CTRF-TQPF)。理论和仿真结果表明，CTRF可以有效地减少反馈量，CTRF-TQPF算法可以有效保障用户的不同业务需求，降低系统的丢包率。Abstract: Considering Traffic Rate Feedback (CTRF) is proposed for Orthogonal Frequency Division Multiple (OFDM) relay system with different user traffic rate. According to user traffic rate and channel gain, CTRF adjusts dynamically the value of feedback utility function and then compares it with feedback threshold to decide feedback, which can reduce the feedback quality of the system. Meanwhile, a cross-layer scheduling criterion based on user Traffic Queue Proportional Fair (TQPF) is proposed. Finally, a feedback reducing and scheduling algorithm combining CTRF and TQPF (CTRF-TQPF) is proposed to support different traffic rate. Theoretical and simulation results show that CTRF can reduce feedback and CTRF-TQPF can meet user traffic need and reduce packet loss rate of the system.
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