Optimizing resource allocation in URLLC for real-time wireless control systems

Chang, B., Zhang, L. , Li, L., Zhao, G. and Chen, Z. (2019) Optimizing resource allocation in URLLC for real-time wireless control systems. IEEE Transactions on Vehicular Technology, 68(9), pp. 8916-8927. (doi:10.1109/TVT.2019.2930153)

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Abstract

As one of the three main scenarios in the fifth-generation (5G) cellular networks, ultra-reliable and low-latency communication (URLLC) can be served as an enabler for real-time wireless control systems. In such a system, the communication resource consumption in URLLC and the control subsystem performance are mutually dependent. To optimize the overall system performance, it is critical to integrate URLLC and control subsystems together by formulating a co-design problem. In this paper, based on uplink transmission, we study the resource allocation problem for URLLC in real-time wireless control systems. The problem is conducted by optimizing bandwidth and transmission power allocation in URLLC and control convergence rate subject to the constraints on communication and control. To formulate and solve the problem, we first convert the control convergence rate requirement into a communication reliability constraint. Then, the co-design problem can be replaced by a regular wireless resource allocation problem. By proving the converted problem is concave, an iteration algorithm is proposed to find the optimal communication resource allocation. Based on that, the optimal control convergence rate can be obtained to optimize overall system performance. Simulation results show remarkable performance gain in terms of spectral efficiency and control cost. Compared with the scheme of satisfying fixed quality-of-service in traditional URLLC design, our method can adjust optimal spectrum allocation to maximize the communication spectral efficiency and maintain the actual control requirement.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Zhao, Dr Guodong and Li, Dr Liying and Chang, Bo and Zhang, Dr Lei
Authors: Chang, B., Zhang, L., Li, L., Zhao, G., and Chen, Z.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:IEEE Transactions on Vehicular Technology
Publisher:IEEE
ISSN:0018-9545
ISSN (Online):1939-9359
Published Online:22 July 2019
Copyright Holders:Copyright © 2019 IEEE
First Published:First published in IEEE Transactions on Vehicular Technology 68(9): 8916-8927
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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