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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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Performance of link adaptation in GPRS networks

Dunlop, J. and Gozalvez, J. (2003) Performance of link adaptation in GPRS networks. Electronics Letters, 39 (1). pp. 139-140. ISSN 0013-5194

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Abstract

In GPRS four coding schemes have been defined with different degrees of data protection. The selection of a fixed one for a certain packet transmission would lead to a throughput loss if the channel quality conditions vary during the connection, therefore, a link adaptation algorithm based on a block error rate (BLER) estimation is proposed and analyzed. The BLER is calculated from the acknowledgement messages reported by the receiver; so the acknowledgement frequency impacts the link adaptation, and therefore, is studied in the present article. The resulting link adaptation algorithm has been analyzed with a dynamic network simulator, under different frequency reuse patterns and frequency hopping strategies. Furthermore, the mean user throughput for the fixed coding schemes and for link adaptation has been estimated from GSM network reported measurements, and a network operator planning tool.