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基于前向纠错编码理论,在光突发交换网络中提出一种丢包恢复机制来降低突发丢失率.构造了一种能对突发包进行在线编解码的低密度奇偶校验码.入口边缘节点通过对信息突发包进行在线编码产生冗余突发包,出口边缘节点利用译码算法从接收到的突发包中恢复出丢失的突发数据.另外,为信息突发包增加一个额外的偏置时间以减少冗余突发与信息突发竞争信道资源.通过OPNET仿真软件对不同丢包恢复机制的性能进行仿真,结果表明,与奇偶校验码提出的丢包恢复机制相比,具有更低的突发丢失率和良好的丢包恢复能力.
Based on the theory of forward error correction coding, a packet loss recovery mechanism is proposed to reduce the burst loss rate in optical burst-switching networks. A low-density parity-check code for on-line codec burst packets is constructed. The ingress edge node generates redundancy burst by in-line coding the information burst, and the egress edge node recovers the missing burst data from the received burst using the decoding algorithm. In addition, for the information burst An additional offset time to reduce the redundant burst and information burst channel resources competition.Through OPNET simulation software to simulate the performance of different packet loss recovery mechanism, the results show that, with the packet loss recovery mechanism proposed by the parity-check code phase Ratio, with a lower burst loss rate and good packet loss recovery capability.