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Link adaptation algorithms for improved delivery of delay- and error-sensitive packet-data services over wireless networks

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Abstract

Link Adaptation is a radio resource management technique that assesses the channel conditions and selects a transport mode, from a set of possible options, which is optimised for these conditions according to a predefined criterion. The optimum transport mode is commonly determined so as to maximise the throughput. Although this approach may be appropriate for best-effort services, its suitability for multimedia services, usually characterised by tight delay and error performance constraints, has been questioned. As a result, a number of alternative algorithms have been proposed in the literature. In this context, this paper presents and evaluates in a dynamic radio environment several Link Adaptation algorithms designed to enhance the provision of delay- and error-sensitive multimedia packet-data services over wireless systems. The obtained results demonstrate that significant improvements in terms of throughput, transmission delay, error performance and operation of Link Adaptation itself can be obtained with the proposed schemes.

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Notes

  1. Expression (3) assumes that transport modes with lower index i values (the minimum value is equal to 1) correspond to more robust transport modes.

  2. A RLC block is received with the optimal CS if the used CS selected by the LA algorithm in the previous updating period is equal to the optimal one according to the instantaneous channel quality conditions experienced during the RLC block reception.

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Acknowledgements

This work has been supported by the Ministry of Education and Science (Spain) and FEDER funds under the project TEC2005-08211-C02-02 and by the Generalitat Valenciana under the projects GV05/189 and ACOMP07/256.

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Authors and Affiliations

  1. Signal Theory and Communications Division, University Miguel Hernández, Avenida de la Universidad s/n, 03202, Elche, Spain

    Miguel López-Benítez & Javier Gozálvez

  2. Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, Campus Nord, C/Jordi Girona 1-3, 08034, Barcelona, Spain

    Miguel López-Benítez

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  1. Miguel López-Benítez
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  2. Javier Gozálvez
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Correspondence to Miguel López-Benítez or Javier Gozálvez.

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López-Benítez, M., Gozálvez, J. Link adaptation algorithms for improved delivery of delay- and error-sensitive packet-data services over wireless networks. Wireless Netw 16, 593–606 (2010). https://doi.org/10.1007/s11276-008-0156-8

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