Cross-layer traffic engineering for software-defined radio access networks
Cross-layer traffic engineering for software-defined radio access networks
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DOI：
10.1109/icc.2015.7248852
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
H. Farmanbar;Han Zhang
中科院分区：
文献类型：
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作者：
H. Farmanbar;Han Zhang
我们考虑的问题，流量工程（TE）的软件定义的无线电接入网络（SD-RAN）的回程和无线电接入部分组成。TE的作用是根据其对网络拓扑和链路容量的了解，将流量从源路由到网络中相应的目的地。与链路具有固定容量的有线网络不同，无线电接入网络中的无线链路的容量取决于资源量（例如，频率、时间等）由无线链路调度器分配给它。因此，用于SD-RAN的TE还涉及链路/用户调度的优化。我们提出了一个跨层的解决方案，通过解耦的SD-RAN TE问题成有线网络TE问题和用户调度问题，使用交替方向乘法器（ADMM）。如果SD-RAN TE问题的目标函数是凸的，则保证ADMM迭代收敛。仿真结果表明，我们提出的在线实现密切关注的最优解在一个动态设置，其中各个流独立加入/离开网络。
We consider the problem of traffic engineering (TE) in a software-defined radio access network (SD-RAN) consisting of backhaul and radio access parts. The role of TE is to route traffic from sources to their corresponding destinations in the network based on its knowledge of network topology and link capacities. Unlike wired networks, where links have fixed capacities, the capacity of a wireless link in a radio access network depends on the amount of resource (e.g., frequency, time, etc.) assigned to it by wireless link scheduler. Therefore, TE for SD-RAN also involves optimization of link/user scheduling. We propose a cross-layer solution by decoupling the SD-RAN TE problem into a wired network TE problem and a user scheduling problem using alternating direction method of multipliers (ADMM). The ADMM iterations are guaranteed to converge if the objective function of the SD-RAN TE problem is convex. The simulation results show that our proposed online implementation closely follows the optimal solution in a dynamic setting where individual flows independently join/leave the network.