一种基于随机接入时机动态分配的接入方案

doi:10.11959/j.issn.2096-3750.2022.00266

物联网学报 ›› 2022, Vol. 6 ›› Issue (2): 88-94.doi: 10.11959/j.issn.2096-3750.2022.00266

一种基于随机接入时机动态分配的接入方案

景少雄, 袁悦, 熊家炜, 王军选

西安邮电大学通信与信息工程学院，陕西西安 710121

修回日期:2022-02-22 出版日期:2022-06-30 发布日期:2022-06-01
作者简介:景少雄（1998− ），男，西安邮电大学通信与信息工程学院硕士生，主要研究方向为5G接入网、无线通信、物联网等
袁悦（1996− ），女，西安邮电大学通信与信息工程学院硕士生，主要研究方向为无线通信、物联网等
熊家炜（1997− ），男，西安邮电大学通信与信息工程学院硕士生，主要研究方向为5G接入网、物联网等
王军选（1970− ），男，西安邮电大学教授、硕士生导师，主要研究方向为宽带无线通信、物联网等

An access scheme based on the random access occasion dynamic allocation

Shaoxiong JING, Yue YUAN, Jiawei XIONG, Junxuan WANG

School of Communications and Information Engineering, Xi'an University of Posts ＆Telecommunications, Xi’an 710121, China

Revised:2022-02-22 Online:2022-06-30 Published:2022-06-01

摘要/Abstract

摘要：

随着物联网（IoT, internet of things）的快速发展，机器类型通信（MTC, machine type communication）在生活中的应用大幅增长，机器类设备（MTD, machine type device）的部署也越来越密集。在这种情况下，如果发生断电断网等突发情况，在设备通电的瞬间将会有大规模的MTD同时向基站发起接入，设备接入基站需要完成下行同步、接收系统消息和随机接入（RA, random access）等过程。然而基站所能分配的前导资源是有限的，无法满足如此庞大的接入需求，从而造成网络阻塞，影响设备的接入概率和接入时延。为了减轻RA的接入冲突，提出了一种基于上下行子帧和物理随机接入信道（PRACH, physical random access channel）配置的动态随机接入时机（RO, random access occasion）调整方案，以及针对时延要求高的部分MTD分配特定的前导资源，仿真结果表明该方案能够有效提高系统的吞吐量，降低设备的接入时延。

关键词: 机器类型通信, 随机接入, RO动态分配, 接入时延

Abstract:

With the rapid development of the internet of things (IoT), the application of machine type communication (MTC) in life has grown substantially, and the deployment of machine type devices (MTD) has become more and more intensive.In this case, if there is an unexpected situation such as a power outage and a network failure, a large-scale MTD will initiate access to the base station at the same time when the device is powered on.When the device accesses the base station, it needs to complete the downlink synchronization, system message receiving, random access (RA) and other processes.However, the preamble resources that can be allocated by the base station are limited and cannot meet such a huge access demand, which causes network congestion and affects the access probability and access delay of the device.In order to alleviate the access conflict of RA, a dynamic random access occasion (RO) adjustment scheme was proposed based on the uplink and downlink subframes and physical random access channel (PRACH) configuration, and time-based part of the MTD with high delay requirements allocates specific preamble resources.The simulation results show that this scheme can effectively improve the throughput of the system and reduce the access delay of the device.

Key words: MTC, random access, RO dynamic allocation, access delay

中图分类号:

TN929.5

景少雄, 袁悦, 熊家炜, 王军选. 一种基于随机接入时机动态分配的接入方案[J]. 物联网学报, 2022, 6(2): 88-94.

Shaoxiong JING, Yue YUAN, Jiawei XIONG, Junxuan WANG. An access scheme based on the random access occasion dynamic allocation[J]. Chinese Journal on Internet of Things, 2022, 6(2): 88-94.

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参考文献 12

[1]	GHAVIMI F , CHEN H H . M2M communications in 3GPP LTE/LTE-A networks:architectures,service requirements,challenges,and applications[J]. IEEE Communications Surveys ＆ Tutorials, 2015,17(2): 525-549.
[2]	3GPP. Service requirements for machine-type communications:TS 22.368 V16.0.0[S]. 2020.
[3]	DAWY Z , SAAD W , GHOSH A ,et al. Toward massive machine type cellular communications[J]. IEEE Wireless Communications, 2017,24(1): 120-128.
[4]	U Y W , ZHANG J M , ZHANG Y ,et al. Research on access network overload control of mixed service for LTE network[C]// Proceedings of 2016 2nd IEEE International Conference on Computer and Communications. Piscataway:IEEE Press, 2016: 2955-2959.
[5]	3GPP. Study on RAN improvements for machine-type communications:TR 37.868 V11.0.0[R]. 2011.
[6]	孙君, 万聪, 闵宝成 ,等. 基于退避预测的ACB动态接入新方案[J]. 电子学报, 2019,47(12): 2544-2549.
	SUN J , WAN C , MIN B C ,et al. Anovel dynamic ACB accessing scheme based on back-off prediction[J]. ActaElectronica Sinica, 2019,47(12): 2544-2549.
[7]	TALEB ALI K , BEN REJEB S , CHOUKAIR Z . A dynamic access control scheme to balance massive access requests of differentiated M2M services in 5G/HetNets[C]// Proceedings of 2017 Sixth International Conference on Communications and Networking (ComNet). Piscataway:IEEE Press, 2017: 1-6.
[8]	3GPP. Evolved universal terrestrial radio access(E-UTRA); physical layer procedures:TS 36.213 V16.5.0[S]. 2021.
[9]	3GPP. Evolved universal terrestrial radio access(E-UTRA); medium access control (MAC) protocol specification:TS 36.321 V16.4.0[S]. 2021.
[10]	3GPP. Evolved universal ierrestrial radio access(E-UTRA); physical channels and modulation:TS 36.211 V16.5.0[S]. 2021.
[11]	3GPP. Evolved universal terrestrial radio access(E-UTRA); base station (BS) radio transmission and reception:TS 36.104 V17.1.0[S]. 2021.
[12]	3GPP. Evolved universal terrestrial radio access(E-UTRA); User equipment (UE) radio transmission and reception:TS 36.101 V17.1.0[S]. 2021.

物理随机接入信道配置索引	前导码格式	系统帧号	子帧号
0	0	偶数帧	1
1	0	偶数帧	4
2	0	偶数帧	7
3	0	所有帧	1
4	0	所有帧	4
5	0	所有帧	7
6	0	所有帧	1,6
7	0	所有帧	2,7
…	…	…	…

上行-下行配置	上下行子帧切换周期/ms	子帧号
上行-下行配置	上下行子帧切换周期/ms	0	1	2	3	4	5	6	7	8	9
0	5	D	S	U	U	U	D	S	U	U	U
1	5	D	S	U	U	D	D	S	U	U	D
2	5	D	S	U	D	D	D	S	U	D	D
3	10	D	S	U	U	U	D	D	D	D	D
4	10	D	S	U	U	D	D	D	D	D	D
5	10	D	S	U	D	D	D	D	D	D	D
6	5	D	S	U	U	U	D	S	U	U	D

BI指数	退避参数/ms	MTD数
0	0	0～250
1	250	250～1 000
2	500	1 000～2 000
3	1 000	2 000～3 000
4	2 000	3 000～4 000

符号	名称	数值
M	可用preamble总数	64
m	用于时延敏感的preamble	6
N	发起随机接入的MTD总数	500～4 000
n	时延敏感MTD总数	10%×N
w₁	时延敏感设备权值	0.8
w₁	非时延敏感设备权值	0.2

一种基于随机接入时机动态分配的接入方案

An access scheme based on the random access occasion dynamic allocation

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