| Summary: | 碩士 === 國立交通大學 === 電信工程系 === 91 === Third generation mobile radio systems are designed for multimedia services, such as high quality and high data rate real-time voice and video for personal communication. Therefore, in order to satisfy the requirement of multimedia services, efficient and flexible channel allocation strategies would be necessary to enhance the system performance.
In this thesis, a fast DCA for high-rate services algorithm (HR-DCA) is proposed for WCDMA/TDD systems. The high rate services are transmitted by higher BS power and are occupied a time slot, namely HRTS. The location dependent HR-DCA is designed for enhanced HR-DCA. The peak rate of mobiles supported by one HRTS for each user is location dependent in the wireless environment. In order to fully exploit the bandwidth of HRTS, it should carefully consider the condition to initiate a HRTS, such as other-to-home cell interference ratio and the number of code channels in one time slot.
In the simulation results, the overall throughput can be enhanced about 10% and the mean delay time can be reduced about 50% by the location dependent HR-DCA in micro cell environment. The WCDMA/TDD system is widely used in micro cell environment. Therefore, it is said that the location HR-DCA algorithm can realize the ability higher data rate transmission and lower delay bound so that achieve the criterion of the multimedia services in the WCDMA/TDD system.
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