Quality of service constrained throughput optimisation for joint adaptive transmission with automatic repeat request over block-fading channels

• Published in: IET communications Vol. 3; no. 6; pp. 1030 - 1040
• Main Authors: Harsini, J.S., Lahouti, F.
• Format: Journal Article
• Language: English
• Published: Stevenage Institution of Engineering and Technology 01.06.2009; John Wiley & Sons, Inc
• Subjects: Adaptation; Applied sciences; Automatic repeat request; Blocking; Channels; Constraints; Delay; Exact sciences and technology; Information, signal and communications theory; Links; Modulation, demodulation; Operation, maintenance, reliability; Optimization; Signal and communications theory; Switching and signalling; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Performance evaluation; Quadrature amplitude modulation; Wireless telecommunication; Information rate; Loss rate; Data transmission; Packet error rate; Adaptive method; M ary modulation; Traffic control; Delay time; Fading channels; Packet switching; Flow rate regulation; Teletraffic; Algorithm; Information transmission; Constrained optimization; Traffic management; Numerical simulation; Metric; Transmission rate; Transmission loss; Automatic repeat request; Service quality
• ISSN: 1751-8628; 1751-8636
• DOI: 10.1049/iet-com.2008.0305

An optimisation framework for wireless link adaptation which maximises the system throughput subject to a packet-level quality of service (QoS) constraint is presented. The authors consider joint adaptive variation of the transmitted power level, transmission data rate and packet-error-rate (PER) at the physical layer to improve the throughput performance of the selective-repeat automatic repeat request (SR-ARQ) protocol over block-fading channels. Specifically, for discrete-rate coded M-QAM schemes, the authors present a power and rate adaptation algorithm that guarantees a target PER constraint. The proposed framework also facilitates optimising the throughput performance for delay constrained wireless applications, which imposes a limit on the number of retransmissions for the ARQ. In particular, a link adaptation scheme is presented, which guarantees a target packet-loss rate (PLR) when a truncated SR ARQ protocol at the data-link layer is employed. Numerical results indicate that the proposed adaptation schemes compared with other adaptive schemes noticeably enhance the system throughput. Also, in the case of truncated ARQ, the results illustrate a fundamental trade-off between the delay and PLR QoS metrics achieved at the maximum throughput performance.