In wireless communication networks, several technologies have been developed to satisfy various of needs when transmitting data. The IEEE 802.16e standard is one of the most popular issues being discussed in recent years. Handover is an essential issue when we talk about mobile communications. In the handover decision procedure of the IEEE 802.16e standard, how to select the best target BS from neighbor BSs for the MSS further handover is an open issue. In general way the serving BS always chose the BS with the strongest RSSI as the MSS’s target BS. However, the most RSSI doesn’t mean the BS have the most resource or have the best quality. There are still other indicators to assist decision, such as CINR, relative delay, and available bandwidth. We design a fuzzy decision system and utilize these useful parameters as inputs to select the target BS which can best serve the MSS. What we propose is a service-oriented handover scheme and design different criteria according to different service type. Then we simulate the handover process in NS-2 and verify our scheme.
