基于多功率电平-多前导的mMTC免授权随机接入方案

doi:10.12305/j.issn.1001-506X.2023.08.36

Abstract

Abstract:

Traditional grant-free random access schme has a serious problem on preamble collision, which greatly limits the random access performance of the end side. In order to reduce the preamble collision and improve the probability of grant-free random access, a multi-power level and multi-slot joint grant-free random access scheme based on multiple input multiple output(MIMO) is proposed. In the proposed scheme, the active user randomly selects multiple preamble sequences from the preamble pool to form a combined preamble and selects a sending power level according to its own position to transmit the combined preamble and signal to the base station in sequence according corresponding level. The base station uses sequential interference cancellation(SIC) technology to separate signal of different power levels, and then identifies competing users and estimates random access conflicts through preamble detection. The simulation results show that compared with the single non-orthogonal multiple access(NOMA) scheme and the single multi-preamble scheme, the proposed scheme can effectively improve the access success probability of users, and has a better adaptability to massive random access scenarios.

Key words: random access, multi-power level, combined preamble, sequential interference cancellation(SIC)

CLC Number:

TN929.53

Jingwen WANG, Jing ZHANG, Chulong LIANG. Grant-free random access scheme for mMTC based on multi-power level and multi-preamble[J]. Systems Engineering and Electronics, 2023, 45(8): 2606-2614.

Figures/Tables 8

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References 31

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变量名称(符号)	变量取值
蜂窝小区覆盖半径R/m	100
基站天线数量M	128
用户数量N	[0~100]
前导序列数量K	8
前导序列长度J	8
前导子时隙数量T	[1~3]
功率电平级数L	[1~9]
上行接收灵敏度$\bar{\varGamma} / \mathrm{dB} $	2
路径损失因子α	4

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Grant-free random access scheme for mMTC based on multi-power level and multi-preamble

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