Random Access Preamble Assignment Algorithm of TD-LTE

Random access is the necessary process in the establishment wireless link between the UE and the network, the performance of the random access directly affects the performance the network. According to the analysis of the random access process and the disadvantage of current random access preamble choice and assignment plan of TD-LTE system, this article proposed one kind of preamble assignment algorithm which is based on the users’ priority and the user load situation of Base Station. This algorithm increases a preamble part which is based on priority of users, all the preambles are divided into three cases and different cases will trigger according to different user load threshold. This preamble assignment plan compensates the disadvantage of traditional preamble assignment plan; and the simulation result indicates that this algorithm can raise the access success ratio in different situation of user load.