Throughput-Guaranteed Resource-Allocation Algorithms for Relay-Aided Cellular OFDMA System

• Published in: IEEE transactions on vehicular technology Vol. 58; no. 4; pp. 1951 - 1964
• Main Authors: Kaneko, M., Popovski, P., Hayashi, K.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive algorithms; Algorithm design and analysis; Algorithms; Applied sciences; Base stations; Cellular; Connection and protection apparatus; Design engineering; Downlink; Electrical engineering. Electrical power engineering; Equipments and installations; Exact sciences and technology; Frame relay; Frequency diversity; Information, signal and communications theory; Mobile radiocommunication systems; Multicarrier system; Multiple access; Multiplexing; multiuser diversity; OFDM; orthogonal frequency-division multiple access (OFDMA); Physical layer; radio resource allocation; Radio spectrum management; Radiocommunications; relay system; Relay systems; Resource allocation; Resource management; Signal and communications theory; Stations; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Transmission and modulation (techniques and equipments); Wireless networks; Parameter estimation; Relay; Base station; Wireless telecommunication; Resource allocation; Frequency division multiple access; Information rate; Power system stability; Downlink; Cell network; radio resource allocation; relay system; Channel estimation; Algorithm complexity; Cell system; Mobile radiocommunication; Multiple access; Multicarrier system; Outage; multiuser diversity; Multicarrier; Algorithm; Information transmission; orthogonal frequency-division multiple access (OFDMA); Orthogonal frequency division multiplexing; System simulation; Resource management
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2008.2005058

Radio resource allocation for downlink transmissions in a cellular system based on orthogonal frequency-division multiple access (OFDMA) has been the subject of many research studies over the past few years. Nowadays, increasing attention has turned to cellular systems with relays, but only a few algorithms have been designed for OFDMA-based relay systems. In this paper, resource-allocation schemes are proposed for the cases of one relay station (RS) and multiple RSs in the cell. Due to the specific design of these algorithms, which operate in an RS-aided base station centralized manner, the amount of required channel-state information and algorithm complexity are minimized, making them suited for practical use. The idea of adaptive RS activation is introduced, where the frame structure is adapted depending on the active RS. Different numbers of relays are considered, and the corresponding algorithms are accordingly adapted. Simulation results show that our algorithms achieve a very good throughput/outage tradeoff.