Power allocation for HARQ-IR systems under QoS constraints and limited feedback

To, Duc, Nguyen, Huan X. ORCID: https://orcid.org/0000-0002-4105-2558, Vien, Quoc-Tuan ORCID: https://orcid.org/0000-0001-5490-904X and Huang, Li-Ke (2015) Power allocation for HARQ-IR systems under QoS constraints and limited feedback. IEEE Transactions on Wireless Communications, 14 (3) . pp. 1581-1594. ISSN 1536-1276 [Article] (doi:10.1109/TWC.2014.2370049)

Abstract

This paper investigates power allocation for reliable downlink transmission in cellular networks subject to quality-ofservice (QoS) constraints. The reliability of data transmissions is assured by hybrid automatic repeat request protocol with incremental redundancy (HARQ-IR). By developing and evaluating the effective throughput of the HARQ-IR protocol for the downlink transmission under buffer-limited QoS constraints, we propose a novel adaptive power allocation algorithm to efficiently exploit the available resources when only limited channel state information (CSI) is available. The proposed algorithm, based on monotonic optimisation, allows near-optimal performance to be achieved with reasonably low complexity.

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