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Frequency Band and Time Slot Selection Scheme for Downlink Packet Communications in Cellular Band Division MC-CDM Systems
Kazuo MORI Hideo KOBAYASHI
IEICE TRANSACTIONS on Communications
Publication Date: 2004/05/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Mobile Multimedia Communications)
Category: Mobile Radio
MC-CDMA, band division, radio resource allocation, frequency band, time slot, packet communication, cellular system, mobile multimedia,
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Band Division MC-CDM (BD-MC-CDM) has been proposed for high quality wireless communications and has been investigated in terms of link level performance. In this paper, we investigate frequency band and time slot selection technique from the viewpoint of system level performance in order to realize the efficient BD-MC-CDM system under cellular environments. Then a downlink frequency band and time slot selection scheme is proposed for cellular BD-MC-CDM systems. The proposed scheme selects transmission frequency band according to the signal-to-interference ratio (SIR) estimated by using the pilot signal at mobile stations and also selects transmission time slot by using the SIR threshold. Simulation results show that the proposed scheme improves the downlink throughput but degrades delay performance and it has a trade off between throughput and delay performance. By selecting suitable control parameters, the proposed scheme achieves the throughput improvement without sacrificing the delay performance.