LTE-A中基于时隙接入的接入拥塞控制优化算法  

Access congestion control optimization mechanism based on slot access in LTE-A

作　　者：段红光[1] 何功成 Duan Hongguang;He Gongcheng(College of Communication & Information Engineering, Chongqing University of Posts & Telecommunications, Chongqing 400065, China)

机构地区：[1]重庆邮电大学通信与信息工程学院

出　　处：《计算机应用研究》2019年第6期1836-1838,1857,共4页Application Research of Computers

基　　金：国家科技重大专项资助项目(2016ZX03002010-003)

摘　　要：在LTE-A中,由于物理随机接入信道(physical random access channel,PRACH)资源有限,当大量的设备几乎同时向基站发起随机接入请求时,可能会导致接入网拥塞,接入时延增大,无法满足用户的服务质量需求。通过分析时隙接入模型,提出了一种自适应调整时隙接入周期的接入控制优化方案。与基于时隙接入的信道接入控制协议(SCACP)相比,该方案首先通过实时接入负载的估计,优化时隙接入周期的选择,均衡了接入时隙的接入请求,既保障了设备的接入成功率,又减少了不必要的前导重传,降低了接入时延。最后,仿真结果验证了所提接入控制优化方案的有效性。In LTE-A, it may result in congestion when massive devices initiate almost simultaneously a random access request to the base station, and then the access delay will be increased and the quality of service will be not satisfied. By analyzing the random access model of slotted access, this paper proposed an access congestion control mechanism based on slot access cycle decision adaptively with the estimation of access load. Compared with the slotted-access-based channel access control protocol (SCACP), this paper optimized the choice of slot access cycle to counterbalance the timeslot access load for the sake of access success probability and access delay. Finally, the simulation results demonstrate the effectiveness of the access congestion control mechanism.

关 键 词：LTE-A 随机接入 时隙接入 基于时隙接入的信道接入控制协议 

分 类 号：TN929.5[电子电信—通信与信息系统]