Journal of Computer Applications

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Network coding traffic design using column generation techniques

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  • Received:2008-02-28 Revised:2008-03-30 Online:2008-08-01 Published:2008-08-01
  • Contact: Yun-Ji SONG

用column generation算法规划网络编码业务

宋运吉 王晟 王雄   

  1. 电子科技大学宽带光纤传输与通信网络技术重点实验室 电子科技大学宽带光纤传输与通信网络技术重点实验室 电子科技大学宽带光纤传输与通信网络技术重点实验室
  • 通讯作者: 宋运吉

Abstract: Network coding can reduce the cost of key links and improve the load balance of the network. But heuristic routing algorithms cannot find the global optimal solution for the network. We used column generation to solve the Network Coding based traffic programming problem. First, we relaxed the constraints of the problem by using Lagrange Relaxation, then defined the physical meaning of each relaxation variable. At last, used relaxation variables updating the multicast graph in iteration. Compared with the heuristic routing algorithm, column generation can improve the network throughput, compared with Integer Linear Programming (ILP). It can compute less inventory routings and accelerate convergence.

Key words: network coding, Integer Linear Programming, network throughput

摘要: 网络编码能够有效降低网络中关键边的资源消耗,改善网络的负载均衡。但是普通的启发式路由算法通常只能为单个业务寻找最优路由,无法优化网络的整体性能。运用column generation算法对网络编码业务进行规划,为松弛系数赋予具体的物理含义,并据此进行路径更新,有针对性地为每个业务寻找路由。与启发式算法相比,column generation从整体上提高了网络的吞吐量,改善了网络的负载均衡。同时,与普通ILP算法相比,column generation算法无需计算大量备选路径,且函数始终处于收敛状态,不会产生振荡,求解总时间缩短了23.5%,总代价优化2.5%。

关键词: 网络编码, 整数线形规划, 网络吞吐量