Multicast in Multi-Channel Wireless Mesh Networks

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The authors study high-throughput multicast solutions for Wireless Mesh Networks (WMN). Two techniques in WMN design are considered for combating wireless bandwidth limitations and wireless interference, respectively: introducing multiple mesh gateways and exploiting the diversity of wireless channels. They target a cross-layer solution that jointly selects appropriate channels for each mesh node to use, at judiciously tuned power, and computes the optimal multicast flows associated with the channel assignment. Their solution is obtained by first formulating the WMN multicast problem into a mathematical program, and then designing an iterative primal-dual optimization framework for it based on Lagrange relaxation and primal problem decomposition.