A novel interference avoidance technique on MAC protocol for Wireless LAN-WIMAX relay

To use WLAN (wireless LAN) terminals anywhere, mobile wireless routers (MWRs) that can connect WLAN terminals to the backbone network by using WLAN-WiMAX (Worldwide Interoperability for Microwave Access) relay are receiving a lot of attention. These MWRs have small chassises because of their mobility. Therefore, the WLAN device and WiMAX device are adjacent to each other in these MWRs. Moreover, the assigned frequency bands of WLAN (2.4GHz) and WiMAX (2.5GHz) are close. Under this situation, the two wireless devices suffer mutual system interference, which greatly degrades system throughput of the wireless relay. To suppress this interference, this paper proposes a novel interference avoidance technique for the MAC protocol of WLAN-WIMAX relays; it is comparatively easy to implement in small terminals. Simulations show that the proposed method outperforms the conventional methods.