Research Of TD-LTE Downlink Wireless Control Resource Management

With the commercialization of LTE, LTE technology has a rapid development. However LTE system in the downlink control resources management still has many aspects to improve. The existing LTE system in the process of the transmission of downlink control resources,produce a large amount of redundant information and more UE side processing delay,and delay-LTE system is a demanding system, and the wireless resources is very precious. Therefore, how to reduce the UE side processing delays and improve the system’s throughput become a hot research.This paper mainly focus on the blind detect in UE side, designed aggregation level priority selection algorithm(Aggregate Level Priority, ALP) and search spatial localization algorithm(Search Area Localization, SAL), respectively, from the aggregation level of preferences and resource mapping two aspects to reduce the number of blind detection UE side, thereby reducing system latency. On the basis of SAL algorithm arranged for control channel resources issues, the base station side designed a resource in descending order algorithm(Resources Sorted descend, RSD) to improve resource utilization.ALP algorithm in the process of aggregation level selection, combine the previous aggregation level and user blind detection results reported CQI information, make the UE side quickly find the user control information stored in the search space, and adapt to the channel change small scenes and dramatic changes in channel scenarios. Through simulation, the algorithm is relatively conventional blind algorithm reduces the UE side 10% of the number of blind detection.SAL algorithm in mapping the location of the search space to find information on the user’s control, take advantage of the uniqueness of the user RNTI value, and use the result of each user RNTI mod N as a user specific location in the search space, so UE can take advantage of user the RNTI value quickly locate the specific location of the user in a different search space, reducing the number of times a user PDCCH blind detection, thereby reducing the latency of the system. And through simulation, the algorithm is relatively conventional blind algorithm reduces the UE side 10% of the number of blind detection.RSD algorithm in terms of resource arrangement process, put the different control information in descending order according to the size of the control information, eliminating the need for redundant information therein. Therefore more resources can transmit data services. And arrange for the program, using the thought SAL resource to map algorithm, which not only improves the throughput of the system, but also reduces the delay. Through simulation, RSD algorithm can reduce the radio sub-frame control area 1-2 OFDM symbol, leaving the data portion of the multi-1-2 OFDM symbols for data transmission, the calculation, the algorithm can enhance the system throughput by 7% to 14%, and in terms relative to traditional UE side blind reduced by 10 percent.Based on the above, this paper has been greatly improved effect on blind for the LTE downlink control resources and the UE side arrangement. It also has a certain significance on research on Information Management of LTE downlink control.