Dynamic Channel Allocation Under B3G System

With the rapid growth of wireless communication traffic, more requirements for wireless communication system have been put forward, such as high speed data transmission, high spectrum efficiency, high motion and asymmetry traffic. It is importance of dynamic channel allocation(DCA) how to guarantee the asymmetry channel resource, delay and Quality of Service. Dynamic channel allocation (DCA) takes full advantage of flexible characteristic of time division duplex (TDD) system. The system can achieve high frequency utilization and system capacity in symmetry or asymmetry traffic communications when dynamic channel allocation (DCA) technology is used.Firstly B3G system structure and the progress of dynamic channel allocation at present are briefly introduced. On its basis, a strategy of dynamic channel allocation adapting to TDD mode of B3G system is put forward. Generally DCA can be divided into Slow-DCA and Fast-DCA. The Slow-DCA is intended for resource allocation to cells, fast DCA is used for resource allocation to bearer services. The slow DCA algorithm designed in this thesis reduces the inter-cell interference and is suitable for asymmetrical traffic. The fast DCA further minimizes the interference and maximizes the system capacities, frequency spectrum. This dissertation recommends the model analysis of time slot interference and strategy of channel allocation in TDD mode of B3G system. By referring to the resource allocation on data link layer, the feature is especially suitable for differentiated services transmitted. A creativity algorithm for eliminating the interference between the cells is introduced, which effectively minimizes the crossed timeslot interference. In addition, a simulation of the algorithm on computer is shown, adding the quantitative analysis on its performance.