| Summary: | 碩士 === 國立交通大學 === 電機學院碩士在職專班電子與光電組 === 97 === WiMAX (802.16e) is technically capable of offering city-wide broadband connections to a high number of mobile terminals and provides high speed transmission over large area. The technology has strong industrial support, however a number of challenges remain to be resolved. Major concerns include battery life for mobile terminals, balancing support for high velocity and high data-rate, and increasing area coverage. Relay Station technology is a promising approach to address these challenges. The two major benefits of Relay Station employment are coverage extension and throughput enhancement. As the number of Relay Stations increases, the handover scenarios happen much more often than that of non-RS system. The Ping-Pong effect increases the system loading and may not enhance the system throughput. Some unnecessary handovers also may result in the waste of resource and decreases the efficiency. In this thesis, a path reselection mechanism will be introduced to resolve the Ping-Pong effect and throughput issues. This method is implemented in the simulation whose result shows the Ping-Pong handover reduction and higher SINR improvement after handover by using this proposed path reselection mechanism.
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