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A Swarm Intelligence Based Channelization Code Manipulation in WCDMA Networks for Avoiding Code Blocking
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Abstract
CDMA is the access method adopted in the third generation wireless system. In this method, every users share the same bandwidth at the same time but with different codes. In turn to increase capacity of the system in Commercial Wideband Code Division Multiple Access (WCDMA), channelization codes are used to protect the orthogonality between physical channels. In WCDMA, channelization code is obtained by conveying OVSF codes to different users. WCDMA can offer multi-rate service through OVSF codes which can be produced in the form of tree like structure called OVSF-CDMA. OVSF-CDMA network which has some constraint in which the system have to sustain the mutually independent between the assigned codes. Code blocking is mainly due to the orthogonality among the assigned OVSF codes. To result in high efficiency of code usage and to increase the capacity of the system, an efficient channelization code direction system is to be proposed in better way through optimization technique. Efficient PSO algorithm is an optimization technique used in dynamic code assignment scheme which in turn results in better code utilization and increasing system capacity. Experimental results show that the performance of the static and the dynamic or active OVSF code assignment schemes of call blocking probability and number of required call reassignment.
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References
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