Title

Truncated channel inversion power control to enable one-way URLLC with imperfect channel reciprocity

Document Type

Journal Article

Publication Title

IEEE Transactions on Communications

Publisher

IEEE

School

School of Science

Funders

Australian Research Council

Grant Number

ARC Number : DP180104062

Comments

Li, C., Yan, S., Yang, N., & Zhou, X. (2022). Truncated channel inversion power control to enable one-way URLLC with imperfect channel reciprocity. IEEE Transactions on Communications. Advance online publication.

https://doi.org/10.1109/TCOMM.2022.3151763

Abstract

We propose to use channel inversion power control (CIPC) to achieve one-way ultra-reliable and lowlatency communications (URLLC), where only the transmission in one direction requires ultra reliability and low latency. Based on channel reciprocity, our proposed CIPC schemes guarantee the power of received signal that is used to decode the information to be a constant value Q, by varying the transmit signal and power, which relaxes the assumption of knowing channel state information (CSI) at the user. Thus, the CIPC schemes eliminate the overhead of CSI feedback, reduce communication latency, and explore the benefits of multiple antennas to significantly improve transmission reliability. We derive analytical expressions for the packet loss probability of the proposed CIPC schemes, based on which we determine a closed interval and a convex set for optimizing Q in CIPC with imperfect and perfect channel reciprocity, respectively. Our results show that CIPC is an effective means to achieve one-way URLLC. The tradeoff among reliability, latency, and required resources (e.g., transmit antennas) is further revealed, which provides novel principles for designing one-way URLLC systems.

DOI

10.1109/TCOMM.2022.3151763

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