机器类通信中基于负载反馈的拥塞控制方法

doi:10.11959/j.issn.1000-0801.2016280

摘要/Abstract

摘要：

通过分析LTE-Advanced系统中机器类通信（MTC）设备的随机接入效率，提出一种负载反馈控制的改进方法。利用前导状态信息估计当前负载并预测下一接入时隙的负载，然后基于负载的变化调整MTC设备接入控制参数，减少了大量MTC 设备突发性接入对人与人（H2H）设备的影响，能有效降低重传次数，提升接入成功率。通过仿真分析说明所提方案有效可行，具有良好性能。

关键词: LTE-Advanced, 随机接入, 机器类通信, 负载反馈

Abstract:

Through analyzing the access efficiency of machine type communication（MTC）devices in LTE-Advanced system,a loading-feedback control method was proposed.The current access load was estimated and the load of next access slot were calculated using the preamble state information,and the access control parameters for MTC device were adjusted based on the load change dynamically.The good performance of the proposed solution was evaluated by computer simulations.The simulation result shows that the proposed scheme can reduce the impact of nearly simultaneous access of a large number of MTC devices on human-to-human（H2H）devices,decrease the number of retransmissions and improve the access success rate effectively.

Key words: LTE-Advanced, andom access, machine type communication, loading-feedback

段红光,卢松品,王利飞,谭丹,高江奇. 机器类通信中基于负载反馈的拥塞控制方法[J]. 电信科学, 2016, 32(11): 26-31.

Hongguang DUAN,Songpin LU,Lifei WANG,Dan TAN,Jiangqi GAO. A congestion control method based on loading-feedback in MTC[J]. Telecommunications Science, 2016, 32(11): 26-31.

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参考文献 12

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参数	含义	配置
M	MTC设备数量	5 000～35 000
M_h	H2H设备数量	2 000
T_ra/ms	随机接入时隙间隔	5
R	小区可用前导数	54
N_max	前导最大重传次数	5
N_rar	RAR容量	4
W_rar	RAR窗口长度	5
T_backoff/ms	退避指示	20
p_n	前导被检测到的概率	p_n=1-e^-n
p_harq	Msg3/Msg4 HARQ重传概率	0.1
t_pr/ms	Msg3/Msg4处理时间	5
T_barring/ms	ACB 禁止时间	20

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