基于MR-ARQ协议的多业务QoS保证机制研究

针对无线通信中高误码率、高突发误帧、频谱资源紧张等特点,对多拒绝自动请求重传(MR-ARQ)协议相比于传统ARQ协议在提高系统吞吐量、降低系统平均传输时延和时延抖动等方面的优势性能进行了理论分析。在此基础上,针对不同业务传输时对误码率、传输时延和时延抖动的不同要求,研究了基于MR-ARQ协议的宽带无线接入系统(BWA)中多业务混合传输的服务质量保证(QoS)机制,提出了多速率重传策略、基于业务区分的多队列机制以及上行集中带宽分配等3种系统性能优化方案。最后对系统在采用上面3种方案前后的性能进行了仿真和比较分析,验证了方案的可行性和良好效果。

Multi-service QoS guarantee mechanism study based on multi-reject ARQ protocol

Taking into account of high bit error rate (BER) and limited spectrum resource in wireless communication, this paper theoretically analyses the predominance of Multi-Reject Auto Repeat request protocol(MR-ARQ)in comparison to the traditional ARQ in terms of data throughput, transmission latency and jitter. It then proposes the three implementation strategies to provide Quality of Service (QoS) guarantee of multi-service data transmission based on the multi-reject ARQ protocol for Broadband Wireless Access (BWA) systems: multi-rate retransmit, multi-queuing, and scheduled uplink bandwidth block allocation scheme. Finally, the paper presents the simulation results of system performance before and after the use of these strategies to validate their feasibility and effectiveness in improving overall system performances.