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本文介绍一种根据信道时分复用的概念建立的“复用发送-等待”(MSAW)数据链路控制规程。该规程通过把物理信道延迟分割成若干虚拟子信道,并在各子信道上分别执行简单的“发送-等待”规程,从而克服了卫星信道的大往返迟延、较高误码率特性对系统效率的严重影响。文章着重对MSAW规程以有限接收存贮为约束条件的系统数据通过率作了统计预测,并用计算机模拟方法验证了预测结果。分析和模拟结果表明:MSAW规程在性能上优于现有的任何标准的或修正的“面向比特型”规程。
This article describes a “multiplexed send-wait” (MSAW) data link control procedure that is based on the concept of channel time division multiplexing. This protocol overcomes the large round trip delay of satellite channels by dividing the physical channel delay into several virtual subchannels and performs simple “send-and-wait” procedures on each subchannel respectively. The higher bit error rate (BER) The serious impact. This article makes a statistical forecast on the data passing rate of MSAW under the constraint of limited receiving and storing, and verifies the prediction result by computer simulation. Analysis and simulation results show that the MSAW protocol outperforms any existing standard or modified “bit-oriented” protocol in performance.