Research on priority backoff algorithm of TD-SCDMA trunking system
TD-SCDMA集群系统中优先级退避算法研究*

In order to make the priority users be able to set up a call quickly in TD-SCDMA trunking system,this paper proposed a random access technology which was based on priority backoff algorithm.By defining different priority users according to the allocation of the corresponding uplink synchronous code(SYNC_UL)resources and taking priority backoff methods for priority users to make them access fast by class.The simulation results on MATLAB software show that the improved priority exponential backoff algorithm in random access process could perform better for ensuring the successful access rate of high priority users than the priority BEB algorithm.And the successful access rate of medium and low priority users can be obviously increased.What’s more,when the number of access users become large,its average access delay could be declined effectively.