Title :
On the energy delay tradeoff of HARQ-IR in wireless multiuser systems
Author_Institution :
College of Engineering, Swansea University
Abstract :
Energy delay tradeoff (EDT) is a fundamental tradeoff that can play a crucial role in understanding the energy efficiency of various transmission schemes. For hybrid automatic repeat request (HARQ) protocols, EDT can be well defined. In this paper, in order to understand the EDT for wireless multiuser systems, we consider downlink channels where the HARQ with incremental redundancy (HARQ-IR) protocol is employed for reliable transmissions to users. For a given total power, the power allocation is studied and its impact on EDT is investigated. It is shown that the multiuser diversity (MD)-based power allocation becomes preferable when a long effective delay is allowed.
Keywords :
automatic repeat request; delays; radio networks; redundancy; wireless channels; EDT; HARQ with incremental redundancy protocol; HARQ-IR protocol; MD-based power allocation; downlink channels; energy delay tradeoff; energy efficiency; hybrid automatic repeat request protocols; long effective delay; multiuser diversity based power allocation; wireless multiuser systems; Delay; Downlink; Fading; Protocols; Resource management; Signal to noise ratio; Wireless communication; energy efficiency; hybrid automatic repeat request (HARQ); power allocation;
Conference_Titel :
Communications (ICC), 2012 IEEE International Conference on
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4577-2052-9
Electronic_ISBN :
1550-3607
DOI :
10.1109/ICC.2012.6363694
