基于分组合并的多信道停等ARQ性能

从信道数、合并方式、分组丢失率、传输延迟等方面,分析了在Rayleigh衰落信道下具有分组合并的多信道停等ARQ性能.分析结果表明:对于多信道停等ARQ,需根据分组传输时间和往返延迟时间合理安排停等ARQ的信道数,以使ARQ系统性能达到最佳;根据信道质量,采用合适的分组合并方式可减少接收处理延迟;为获得恒定分组传输延迟和系统吞吐率,可根据分组丢失率要求和信道质量调整最大传输次数.

Performance Evaluation of Multi-channel Stop-and-Wait ARQ with Packet Combining

Detailed performance evaluation was presented with respect to the channel number,combining mode,packet loss ratio and transmission delay of multi-channel stop-and-wait ARQ associated with packet combining over a Rayleigh fading channel.The analysis results show that,to achieve optimal system performance,the number of parallel ARQ channels should be planned according to the packet transmission time and round trip feedback delay etc.;the processing delay in the receiver could be decreased by choosing an appropriate combining scheme according to channel quality;and steady transmission delay and throughput could be achieved by adjusting the maximum number of ARQ retransmissions according to the packet loss ratio and channel quality.