为了降低在绿色路由条件下SDN控制器的信令开销,在SDN单控制器域中研究能量效率和信令开销之间的权衡.首先构建一个整型线性规划,在考虑整个网络能量消耗的基础上建立最小化控制器开销的目标函数;其次设计两种启发式算法来寻求该问题的近似最优解.仿真结果表明,在活跃链路数相同条件下,两种算法的控制器信令开销更小,故设计的启发式方法在绿色路由条件下可以减少控制器处理初始请求的信令开销.%In order to reduce signaling overhead of SDN controller in green routing,this paper introduced a trade-off between energy efficiency and signaling overhead in a SDN domain with a single controller.First it formulated an integer linear programming (ILP) problem,whose objective function was minimizing the control overhead by taking into account the total energy consumptionof the network.Then it proposed two heuristic algorithms to find near-optimal solutions.Simulink results show that the algorithms cost less in the condition of the same amount of active links,so the heuristic algorithms can reduce controller signaling overhead of green route in initial demand processing.
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