MIMO-Based Reliable Grant-Free Massive Access With QoS Differentiation for 5G and Beyond
| Autor: | Chung G. Kang, Ameha T. Abebe |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Computer Networks and Communications
Computer science business.industry Quality of service ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS MIMO 020206 networking & telecommunications 02 engineering and technology Interference (wave propagation) Preamble Base station Transmission (telecommunications) 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering business Random access 5G Computer network |
| Zdroj: | IEEE Journal on Selected Areas in Communications. 39:773-787 |
| ISSN: | 1558-0008 0733-8716 |
| Popis: | Grant-free (GF) access has been one of the enablers for the various use cases in 5th generation (5G) mobile system, especially for time-critical massive machine-type communication (mMTC). However, these use cases have diverse quality of service (QoS) requirements, which can be measured in terms of an access success rate from a GF random access perspective. Consequently, a GF scheme that enables supporting of diverse QoS is highly sought. This article proposes a GF access scheme in which high-QoS users superpose multiple preambles to improve their access success rate as a result of the diversity in access collision and multiple access interference seen by multiple preambles. We further show that in the presence of multiple antennas in the base station (BS), a low-complexity receiver can correctly detect active preambles with a significantly high probability, even under severe multiple access interference caused by non-orthogonal preamble transmission. A theoritical performance analysis is conducted by modeling the preamble reception as a multiple measurement vector-based compressive sensing problem. The preamble misdetection probability is shown to decrease exponentially as the number antennas at BS increases. Numerical results demonstrate multiple-order improvement in terms of the access success rate for critical-QoS users, even under severe noise and multiple access contamination. |
| Databáze: | OpenAIRE |
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