The existing TCP mechanisms can not effectively distinguish the cause of packet loss in wireless networks whether it is triggered by congestion or deafness. In order to solve the problem, this paper proposes a Cross-layer Explicit Deafness Notification(CLEDN) in wireless Mesh network. It adopts Media Access Control(MAC) based on busy tones when system uses directional antennas, and an explicit notification frame is designed between IP and TCP, which is passed to source node through the user-defined multi-hop forwarding rule. The mechanism is applied to theoretical deduction and analysis in linear wireless Mesh networks, and numerical analysis verifies its feasibility and validity.
wireless Mesh networks,
packet loss notification mechanism,
packet loss by congestion,
Media Access Control(MAC)