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In wireless mesh access networks, ad hoc and infrastructure modes are both used to support multi-hop data transmission from mesh clients to a mesh router. Traffic will accumulate along the paths towards the mesh router. So the mesh clients close to the router will have more data to transmit and these packets are more likely to collide with each other. In , a random access MAC protocol, RSMA (receiver sense multiple access), is proposed dedicated for the final hop client to router communication to deal with the packet collision problem. In this paper, a rigorous mathematical model is developed for cross-layer performance analysis of RSMA. MAC layer random access model, physical layer radio channel model and the power capture model are combined for comprehensive analysis.