窄带物联网覆盖类别更新机制性能分析与优化

doi:10.11959/j.issn.1000-436x.2018228

通信学报 ›› 2018, Vol. 39 ›› Issue (11): 70-79.doi: 10.11959/j.issn.1000-436x.2018228

窄带物联网覆盖类别更新机制性能分析与优化

简鑫,刘钰芩,韦一笑,宋健,王芳,付澍,谭晓衡

重庆大学微电子通信工程学院，重庆 400044

修回日期:2018-07-23 出版日期:2018-11-01 发布日期:2018-12-10
作者简介:简鑫（1987?），男，四川自贡人，博士，重庆大学副教授，主要研究方向为应用统计数学、物联网无线接入技术及应用等。|刘钰芩（1991?），女，四川南充人，重庆大学硕士生，主要研究方向为窄带物联网、群智感知技术等。|韦一笑（1993?），女，广西河池人，重庆大学硕士生，主要研究方向为窄带物联网、物联网超低功耗技术等。|宋健（1995?），男，江西宜春人，重庆大学硕士生，主要研究方向为智慧网络、群体智能等。|王芳（1995?），女，四川泸州人，重庆大学硕士生，主要研究方向为无线通信理论与技术、分布式队列随机接入等。|付澍（1985?），男，贵州贵阳人，博士，重庆大学讲师，主要研究方向为未来网络、边缘计算等。|谭晓衡（1976?），男，重庆人，博士，重庆大学教授、博士生导师，主要研究方向为下一代移动通信、通信信号处理等。
基金资助:
国家自然科学基金资助项目(61501065);国家自然科学基金资助项目(61571069);国家自然科学基金资助项目(61601067);国家自然科学基金资助项目(61701054);重庆市基础科学与前沿技术研究专项基金资助项目(cstc2016jcyjA0021);中央高校基本科研业务费基金资助项目(106112017CDJQJ168817);中央高校基本科研业务费基金资助项目(2018CDXYTX0009);中央高校基本科研业务费基金资助项目(2018CDYJSY0055)

Performance analysis and optimization for coverage classes updating mechanism of narrow-band internet of things

Xin JIAN,Yuqin LIU,Yixiao WEI,Jian SONG,Fang WANG,Shu FU,Xiaoheng TAN

College of Microelectronics and Communication Engineering,Chongqing University,Chongqing 400044,China

Revised:2018-07-23 Online:2018-11-01 Published:2018-12-10
Supported by:
The National Natural Science Foundation of China(61501065);The National Natural Science Foundation of China(61571069);The National Natural Science Foundation of China(61601067);The National Natural Science Foundation of China(61701054);Chongqing Research Program of Basic Research and Frontier Technology(cstc2016jcyjA0021);Fundamental Research Funds for the Central Universities(106112017CDJQJ168817);Fundamental Research Funds for the Central Universities(2018CDXYTX0009);Fundamental Research Funds for the Central Universities(2018CDYJSY0055)

摘要/Abstract

摘要：

以覆盖类别为状态变量建立了窄带物联网（NB-IoT,narrow-band internet of things）覆盖类别更新机制的马尔可夫链模型，给出了平均接入失败概率和平均功耗的优化模型及求解办法，分析了前导码重复次数、系统负载、全局最大传输次数对各覆盖类别最大传输次数最优取值的影响。数值分析表明：常规覆盖类别和扩展环境覆盖类别的最大传输次数对系统性能影响较大，最大传输次数取值范围应分别控制在[1,5]和[1,7]之间；极端环境覆盖类别的最大传输次数对系统性能影响不大，可取[1,10]之间的任意值，建议取值为1；所提的引入覆盖类别回退机制的覆盖类别更新机制的平均功耗比协议模型低约95%。

关键词: 窄带物联网, 随机接入, 覆盖增强, 覆盖类别, 马尔可夫链

Abstract:

A Markov chain model with coverage classes as state variables was established to describe the dynamics of the coverage classes updating mechanism of narrow-band internet of things (NB-IoT).An optimization model to minimize average probability of access failure as well as average power consumption was formulated,with which the effects of preamble repetition number,system load and global maximum transmission number on the optimal configuration of maximum transmission number of each coverage class was analyzed.Numerical analysis results show that the maximum transmission number of normal coverage and extended coverage have a great influence on the system performance and their value ranges should be set within[1,5]and[1,7]respectively.However,the maximum transmission number of extreme coverage has little influence on the system performance,its value could be any one in[1,10]but the recommended value is 1.In addition,the average power consumption of the model that introduced coverage classes’ rollback mechanism is about 95% lower than the model proposed by 3GPP.

Key words: NB-IoT, random access, coverage enhancement, coverage classes, Markov chain

中图分类号:

TN929.5

简鑫,刘钰芩,韦一笑,宋健,王芳,付澍,谭晓衡. 窄带物联网覆盖类别更新机制性能分析与优化[J]. 通信学报, 2018, 39(11): 70-79.

Xin JIAN,Yuqin LIU,Yixiao WEI,Jian SONG,Fang WANG,Shu FU,Xiaoheng TAN. Performance analysis and optimization for coverage classes updating mechanism of narrow-band internet of things[J]. Journal on Communications, 2018, 39(11): 70-79.

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随机接入参数	LTE	NB-IoT
带宽	1 080 kHz	180 kHz
子载波间隔	15 kHz	3.75 kHz/15 kHz
时隙长度	0.5 ms	2 ms/0.5 ms
接入方式	竞争/非竞争	竞争
前导码序列	Zadoff-Chu序列	辅以跳频的全1序列
前导码重复次数	1	{1,2,4,8,16,32,64,128}
全局最大传输次数	N∈[1,3~200]	N∈[1,3~200],N_i,max∈[1,10]
RA响应窗最大长度	10 ms	10 240 ms

参数说明	符号
第i个覆盖类别	C_i
第i个覆盖类别的前导码传输次数计数器	N_i
第i个覆盖类别的前导码最大传输次数	N_i,max
前导码的全局最大传输次数	N

参数说明	符号
第i个覆盖类别的前导码最大传输失败次数	N_f,i
第i个覆盖类别的前导码最大传输成功次数	N_s,i
终端在第i个覆盖类别的单次接入失败概率	P_f,i
前导码冲突概率	P_f
小区内随机接入用户数	M
可用前导码数	n
前导码多次重复累计功率后带来的接入失败概率减少量	P_?
前导码重复次数	R_i
终端在第i个覆盖类别接入成功后选择第个j覆盖类别作为当前覆盖类别的概率	β_ij
第i个覆盖类别的稳态概率	q_i

参数说明	符号
终端在第i个覆盖类别的接入失败概率	P_i
系统平均接入失败概率	P_c
终端发送一次前导码所需的功耗	E₀
终端在第i个覆盖类别的功耗	E_i
系统平均功耗	E
3个覆盖类别的前导码最大传输次数之和	N_∑
第i层目标函数的记号	L_i
系统负载	t
终端进行一次信道测量所需功耗	E_m

窄带物联网覆盖类别更新机制性能分析与优化

Performance analysis and optimization for coverage classes updating mechanism of narrow-band internet of things

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