Abstract:

This essay deals with a new selfadjusted speed rate control system LLAP（link layer adaptive pacing） in view of the  congestion problem in wireless Mesh network. The link layer queue scheduling mechanism at the gateway is responsible for packet scheduling and MAC circular. LLAP controls the transmission rate of wiredtowireless flows at the Mesh gateway to avoid serious interference among hops brought by excessive data transmission, and the control mechanism is realized at link layer without modifying  the existing transport and  routing protocols. We analyzed the performance of the Mesh network by NS2, and compared LLAP with  802.11 networks. Simulation results show that the network performance controlled by LLAP is superior to  802.11 networks greatly.

Key words: wireless Mesh network, congestion control, multihop