Abstract: Multi-radio multi channel technology can efficiently improve the multi-hop wireless networks' bandwidth and throughput, so that it has been becoming the researching hot spot. Among the so many researching key issues about the multi-radio multi channel technology, wireless channel assignment and management arc more important and difficult. hhis paper proposed a new dual-radio multi-channel MAC protocol using the standard 802. 11 WiFi MC, named as DIM Dua1-Interface Management MAC protocol). DllVI can optimize the channel assignment by applying the channel conflict model,and take full use of the available IEEE802. 11 wireless channels with little command on hardwire configuration. The simulation results show that DIM has more network throughput and less latency of packets delivery.

Key words: Multi-radio multi-channcl,Channcl conflict model, WiFi,Nctwork interface card