Power Allocation for HARQ-IR Systems Under QoS Constraints and Limited Feedback

• Published in: IEEE transactions on wireless communications Vol. 14; no. 3; pp. 1581 - 1594
• Main Authors: Duc To, Nguyen, Huan X., Quoc-Tuan Vien, Li-Ke Huang
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.03.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive algorithms; Algorithms; Allocations; Automatic repeat request; Bandwidth; Buffers; Channels; Delays; effective capacity; hybrid automatic repeat request (HARQ); Optimization; Protocols; Quality of service; quality of service (QoS); Resource allocation; Resource management; Throughput; Wireless communication; effective capacity; hybrid automatic repeat request (HARQ); quality of service (QoS); Resource allocation
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2014.2370049

This paper investigates power allocation for reliable downlink transmission in cellular networks subject to quality-of-service (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.