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

Abstract

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

CLC Number:

TN929.5

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.

Figures/Tables 11

References 31

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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

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

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