带冲突检测的两阶段无连接接入协议最优资源分配  

Optimal resource allocation for two-stage connectionless access with collision detection

作　　者：简鑫[1] 王芳[1] 宋健[1] 付澍 谭晓衡[1] 曾孝平[1] JIAN Xin;WANG Fang;SONG Jian;FU Shu;TAN Xiaoheng;ZENG Xiaoping(College of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China)

机构地区：[1]重庆大学微电子与通信工程学院,重庆400044

出　　处：《通信学报》2019年第5期117-124,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61501065;No.61571069;No.61601067;No.61701054);重庆市基础科学与前沿技术研究专项一般基金资助项目(No.cstc2016jcyjA0021);中央高校基本科研业务费专项基金资助项目(No.106112017CDJQJ168817;No.2018CDXYTX0009;No.2018CDYJSY0055;No.2019CDXYTX0023)~~

摘　　要：无连接接入协议允许机器类终端不需要建立无线承载就进行小数据传输,以降低系统信令开销与终端能耗。两阶段无连接接入协议可通过合理分配调度请求阶段和数据传输阶段的资源提高系统吞吐量,特别适合中高负载场景。基于此,完成了一类称作带冲突检测的两阶段无连接接入协议的性能极限与最优资源分配策略的理论分析,并设计了一种不需要用户数估计的动态资源分配算法。数值分析验证了上述理论分析的正确性,表明了所提动态资源分配算法与已知每个接入周期内用户数的理想算法的性能差异可控制在4%以内。上述结果可为面向海量机器类通信的无线接入协议的优化设计提供参考。Connectionless access allows massive machine type communication (mMTC) devices to transmit small pack- ets without establishment of radio bearers, significantly reducing device power consumption and control signaling over- head. Two-stage connectionless access (TSCLA) improves throughput and resource efficiency by optimally allocating resources between scheduling request (SR) phase and data transmission phase, which can be used for bigger packets and high traffic load. Based on this, a comprehensive theoretical analysis of one kind of TSCLA with collision detection was conducted to investigate its performance limit and devise its optimal resource allocation scheme. In addition, to avoid the complexity of user number estimation, a dynamic resource allocation algorithm with feedback control was proposed. Numerical results are provided to validate the effectiveness of aforementioned theoretical results and show that comparing with the genie aided algorithm known exactly the number of users, the performance loss of the proposed algorithm is within 4%. These works together provide good references for appropriate resource dimensioning for mMTC related protocols.

关 键 词：大规模机器类通信 无连接接入 性能极限 最优资源分配 

分 类 号：TN929.5[电子电信—通信与信息系统]