Improved Method of Contention-Based Random Access in LTE System  

作　　者：Han-Song Su Min Zhang Gao-Hua Liu 

机构地区：[1]School of Electronic and Information Engineering,Tianjin University,Tianjin 300072

出　　处：《Journal of Electronic Science and Technology》2018年第2期175-183,共9页电子科技学刊（英文版）

基　　金：partly supported by the Research of LTE Layer 2 and Smallcell Technology Tracking under Grant No.2013GFW-0005

摘　　要：Random access is the necessary process to establish the wireless link between the user equipment （UE） and network. The performance of the random access directly affects the performance of the network. In this work, we propose a method on the basis of the existing alternatives. In this method, we estimate the system load in advance to adjust the number of terminals. An access threshold is set to control the number of terminals which want to access the base station at an acceptable level. At the same time, we havean improvement on the existing power climbing strategy. We suppose that the power ramping is not always necessary for the re-access. And the selection ofpower ramping steps is studied in this paper. Simulations based on MATLAB are employed to evaluate the effectiveness of the proposed solution and to make comparisons with existing alternatives.Random access is the necessary process to establish the wireless link between the user equipment （UE） and network. The performance of the random access directly affects the performance of the network. In this work, we propose a method on the basis of the existing alternatives. In this method, we estimate the system load in advance to adjust the number of terminals. An access threshold is set to control the number of terminals which want to access the base station at an acceptable level. At the same time, we havean improvement on the existing power climbing strategy. We suppose that the power ramping is not always necessary for the re-access. And the selection ofpower ramping steps is studied in this paper. Simulations based on MATLAB are employed to evaluate the effectiveness of the proposed solution and to make comparisons with existing alternatives.

关 键 词：Access threshold long-term evolution(LTE) power ramping steps random access 

分 类 号：TN929.5[电子电信—通信与信息系统]