CAJ | 학술논문

层间等级网络编码是一种联合利用信源分层编码与组播间线性网络编码优势的多速率线性网络编码技术。与分层组播网络编码相比，层间等级网络编码能够进一步提高异构信宿网络的资源利用效率。然而，网络中各链路上进行的编码类型，是影响层间等级网络编码多速率传输性能的决定性因素。本文面向单信源异构信宿网络，研究层间等级网络编码的优化；基于微分进化算法，提出了一种最优编码类型配置的快速搜索方案。该方案充分体现了信源输出链路上进行的层间等级网络编码对整个网络传输性能的影响；具体设计了符合层间等级网络编码本质特性的微分进化操作。实验结果表明，与现有的启发式算法相比，本文提出的基于微分进化算法的层间等级网络编码优化方案，能够为单信源异构信宿网络获得更高的网络总吞吐量。
층간등급망락편마시일충연합이용신원분층편마여조파간선성망락편마우세적다속솔선성망락편마기술。여분층조파망락편마상비，층간등급망락편마능구진일보제고이구신숙망락적자원이용효솔。연이，망락중각련로상진행적편마류형，시영향층간등급망락편마다속솔전수성능적결정성인소。본문면향단신원이구신숙망락，연구층간등급망락편마적우화；기우미분진화산법，제출료일충최우편마류형배치적쾌속수색방안。해방안충분체현료신원수출련로상진행적층간등급망락편마대정개망락전수성능적영향；구체설계료부합층간등급망락편마본질특성적미분진화조작。실험결과표명，여현유적계발식산법상비，본문제출적기우미분진화산법적층간등급망락편마우화방안，능구위단신원이구신숙망락획득경고적망락총탄토량。
Inter-layer hierarchical network code is a special type of multi-rate linear network code, which combines the advantages of layered source code and inter-session linear network code. Compared to the layered multicast network code, inter-layer hierar-chical network code can take higher utilities of the network resources. The optimization of the code types' allocation for the inter-layer hierarchical network code in the single-source heterogeneous-receivers network is investigate in this paper. Based on the dif-ferential evolution algorithm, a fast searching strategy is proposed. This strategy emphasizes the optimization of the code types on the outgoing links of the source node. All evolutional processes are designed according to the special characteristics of inter-layer hierarchical network code. Simulation results show that higher network throughputs can be achieved by the inter-layer hierarchical network code with the optimization strategy proposed in this paper, compared to the existing heuristic method.