Abstract: This paper did some researches on the ARQ mechanisms which provides the probability of involving the relay nodes into the mechanisms for ultra-wideband multi-hop wireless network,and based on the researches designed a RLC sublayer combining PWMA and Relay ARQ, which can perform as both of the end node and the relay node. Follow this,this paper made a academic analysis of the ultra wideband wireless channel models and simulated the network model under ordinary circumstances and the network model which used ARQ mechanism designed in this paper for representative two-hop wireless network,Compared the simulation results,got the conclusion that using ARQ mechanism designed for ultra-wideband multi-hop network in this paper significantly enhances the throughput and time delay characteristic of the system.

Key words: UWB, Multi-hop, Relay, ARQ