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Scheduling for Network Coded Multicast: A Distributed Approach

We address the problem of maximizing the through- put for network coded multicast traffic in a wireless network in the bandwidth limited regime. For the joint scheduling and subgraph selection problem, we model valid network configu- rations as stable sets in an appropriately defined conflict graph. The problem formulation separates the combinatorial difficulty of scheduling from the arising optimization problem and facilitates the application of less complex scheduling policies. Lagrangian relaxation gives rise to two subproblems, a multiple shortest path, and a maximum weight stable set (MWSS) problem. For the latter we propose a greedy approach which can be computed in a distributed fashion, thus yielding a fully decentralized algorithm. Simulation results show that our technique is nearly optimal and outperforms heuristics such as orthogonal scheduling by a large margin.