An Efficient Transmission Slot Selection Scheme for MC-CDMA Systems with Packet Loss and Delay Bound Constraints

Ji-Bum KIM  Kyung-Ho SOHN  Chung-Ha KOH  Young-Yong KIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B   No.9   pp.3779-3783
Publication Date: 2005/09/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.9.3779
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
Keyword: 
MC-CDMA,  scheduling algorithm,  wireless QoS,  multimedia,  

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Summary: 
In this letter, we propose an efficient transmission slot selection scheme for Band Division Multi-Carrier-CDMA (BD-MC-CDMA) systems under the constraints of packet loss and delay bound for each individual session. By utilizing channel dynamics together with the delay deadline and loss history, one can determine whether to transmit or not during each time slot, based on the prediction of future channel variations. To validate the efficiency of the proposed algorithm, we model each sub-band as a discrete time Markov Chain using a finite state Markov channel (FSMC) and derive the criteria required for transmission decision. Simulation results show that our proposed scheme can satisfy quality of service (QoS) requirements for real-time traffic with minimum use of resources, while increasing throughput of non-real-time traffic with the resources saved from real-time traffic.