การตัดสินใจแฮนด์โอเวอร์แบบฟัซซีโดยใช้อัตราการเคลื่อนที่ของสถานีเคลื่อนที่ระยะทางจากสถานีฐานและความแรงสัญญาณที่รับได้ / วราทร เลิศวงศ์วีรชัย = Fuzzy handover decision using moving rate of mobile station, distance from base station and received signal strength / Waratorn Lertwongweerachai
This thesis proposes an efficient fuzzy handover decision algorithm (by including the moving rate of mobile telephone as decision parameter to the Received Signal Strength (RSS)) which can reduce the handover number as well as restrain the dropped call number within the accepted level. This also improves the overall system performance. The proposed method is compared with Conventional algorithm and fuzzy handover decision algorithm using RSS and distance from Base Tranceiver Station (BTS). The simulation model is based on GSM digital mobile telephone system. This method can be utilized by only changing handover control software in Base Station Controller (BSC). The simulation result shows that F-HYS, which uses inference type 1 is the best method. It is suitable for cell that has overlap ratio about 0.8-1.0 (overlap ratio between cell radius and distance between serving BTS and neighbor BTS). For drop system call is dropped when its RSS is lower than accepable threshold, it is found that handover number decreases 34-40% from that of conventional algorithm and 0-42% from that of fuzzy handover decision algorithm using RSS and distance from BTS, respectively.
