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Virtual carrier sensing-based random access in massive MIMO systems

Version 2 2024-06-13, 13:29
Version 1 2019-12-11, 14:51
journal contribution
posted on 2024-06-13, 13:29 authored by J Ding, D Qu, H Jiang, T Jiang
© 2002-2012 IEEE. Fifth-generation mobile communication systems aim to support massive access for future wireless applications. Unfortunately, wireless resource scarcity in random access (RA) is a fundamental bottleneck for enabling massive access. To address this problem, we propose a virtual carrier sensing (VCS)-based RA scheme in massive MIMO systems. The essence of the proposed scheme lies in exploiting wireless spatial resources of uplink channels occupied by assigned user equipments (UEs) to increase channel resources for RA. With the proposed scheme, RA UEs are able to exploit the spatial resources that are approximately orthogonal to those of assigned UEs, thus sharing the uplink channel resource with assigned UEs without causing significant interference to them. Specifically, to ensure RA UEs avoid serious interference with assigned UEs, a base station (BS) sends tailored virtual carriers to RA UEs on behalf of assigned UEs. The RA UEs then conduct VCS to determine whether or not the uplink channel resource is available for RA. The closed-form approximations for probability of channel availability and uplink achievable rate with the proposed scheme are derived. Theoretical analysis and simulation results show that the proposed scheme is able to significantly increase channel resources of RA for massive access.

History

Journal

IEEE Transactions on Wireless Communications

Volume

17

Pagination

6590-6600

Location

Piscataway, N.J.

ISSN

1536-1276

eISSN

1558-2248

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

10

Publisher

IEEE