Authors: Vasilis Friderikos, A. Hamid Aghvami
Addresses: Centre for Telecommunications Research, King's College London, 26-29 Drury Lane, London WC2B 5RL, UK. ' Centre for Telecommunications Research, King's College London, 26-29 Drury Lane, London WC2B 5RL, UK
Abstract: A power and rate adaptation scheme for CDMA networks is proposed that uses information from the TCP-friendly (TFRC) transport protocol and the type of MPEG-4 frame (i.e. Intra, Predictive or Bidirectional) together with lower layer criteria in order to optimise packet transmission over the wireless link. A multiobjective optimisation problem is formulated based on the weighted sum of two competing objectives and is solved using derivative based optimisation techniques. The first objective expresses the absolute difference between the required transmission rate as defined by the TFRC and the allocated rate and the second is the total consumed power. Furthermore, in the proposed scheme, the allocated bit-energy-to-interferencepower-spectral-density ratio, Eb/I0, depends on the type of video frame being transmitted. Based on a derived condition for optimal allocation, heuristic allocation is performed. Finally, through simulation results the proposed scheme is evaluated and possible different ramifications of the scheme are discussed.
Keywords: MPEG-4; streaming video; TCP friendly rate control; power control; rate adaptation; CDMA networks; rate control; simulation; wireless networks.
International Journal of Wireless and Mobile Computing, 2007 Vol.2 No.2/3, pp.212 - 223
Published online: 09 Jul 2007 *Full-text access for editors Access for subscribers Purchase this article Comment on this article