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针对当前基于网络编码的代表性无线广播重传(NCWBR)策略中,如果一个编码组合包包含了不止一个在某一接收节点丢失的信息包,就会导致编码包解码失败而丢弃编码包,从而引起分组重传次数增加、网络时延增大等问题.通过不丢弃解码失败的编码包,从多个这样的编码包中解码出信息包的思路,提出了广播重传中基于多包解码的高效快速网络编码(MDNCBR)策略,并通过增加“打破交叉关系就重传”的机制进一步提出了MDNCBR的改进方案(IMDNCBR).理论分析和仿真结果表明:MDNCBR及IMDNCBR策略能有效提高接收节点的解码效率,快速地确定须要重传的信息包,与NCWBR策略相比能够有效地减少丢失包的重传次数,降低传输时延和网络开销,提高传输性能.
In the current NCWBR strategy based on network coding, if an encoded combination packet contains more than one packet lost at a receiving node, the decoding of the encoded packet will fail and the encoded packet will be dropped The number of packet retransmission increases and the network delay increases.Aiming at the problem of decoding packets from many such packets without discarding the decoding packets which have failed to be decoded, (MDNCBR) strategy, an improved scheme of MDNCBR (IMDNCBR) is proposed by adding the mechanism of “breaking the cross-relationship retransmission.” The theoretical analysis and simulation results show that the MDNCBR and IMDNCBR strategies can effectively improve the receiving Node decoding efficiency, quickly determine the need to retransmit the packet, compared with the NCWBR strategy can effectively reduce the number of retransmission packet loss, reduce transmission delay and network overhead and improve transmission performance.