Study on Soft Handoff Management Using MC-CDMA in Wireless ATM Networks

This book focuses on the characteristics of the wireless ATM networks based on multi-carrier code division multiple access (MC-CDMA) technique. MC-CDMA technique can use several pseudorandom noise codes (PN codes) to transmit in the same period to obtain higher throughput and support different traffic streams. Handoff management is an important issue in wireless ATM mobile communication systems. With soft handoff, a conditional decision is made on when to hand off, which depends on the changes in pilot signal strength from the two or more base stations involved. The main aimed of this thesis is to study on soft handoff management, which resolves two significant problems, hot-spot cell and resource management, to decrease handoff call dropping probability. We propose a complete traffic shedding algorithm (CTSA) for soft handoff efficiently to alleviate the overloaded traffic in a hot-spot cell by adjusting handoff parameters, which virtually reduces the service coverage of the heavy loaded BS without adjusting the transmission power. In addition, in resource management, we propose a dynamic resource allocation scheme (DRAS) to improve performance.