Exploiting correlation between wideband and differential CQIs for adaptation and feedback

Kumar, V and Mehta, NB (2020) Exploiting correlation between wideband and differential CQIs for adaptation and feedback. In: 2020 IEEE Global Communications Conference, GLOBECOM 2020, 7-11 Dec-2020, Virtual, Taipei; Taiwan.

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Abstract

Differential channel quality indicator (CQI) and wideband CQI are key components of the 4G and 5G standards. They enable a base station (BS) to acquire channel state information that is essential for rate adaptation and scheduling without overwhelming the uplink. We present a novel throughput-optimal rate adaptation rule, which exploits the correlation between the differential and wideband CQIs to improve throughput without any additional feedback, and a computationally efficient approach to evaluate it. We then propose a novel flexible-overhead differential CQI feedback scheme, in which the number of feedback bits can be subband-specific. The combination of the two approaches provides a new flexibility to the BS to control the feedback overhead and achieves a throughput comparable to conventional approaches with much less feedback. © 2020 IEEE.

Item Type:	Conference Paper
Publication:	2020 IEEE Global Communications Conference, GLOBECOM 2020 - Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Channel state information, Computationally efficient; Conventional approach; CQI feedbacks; Differential channels; Feedback bits; Feedback overhead; Rate adaptation; Throughput-optimal, Feedback
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	23 Apr 2021 07:02
Last Modified:	23 Apr 2021 07:02
URI:	http://eprints.iisc.ac.in/id/eprint/68246

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