Optimal downlink scheduling schemes for CDMA networks

TitleOptimal downlink scheduling schemes for CDMA networks
Publication TypeConference Paper
Year of Publication2004
AuthorsKwan, R., and C. Leung
Conference NameWireless Communications and Networking Conference, 2004. WCNC. 2004 IEEE
Pagination2137 - 2142 Vol.4
Date Publishedmar.
KeywordsCDMA network, cellular radio, code division multiple access, integer programming, mixed-integer nonlinear programming optimization problem, mobile station traffic load, modulation coding, modulation coding scheme, multicodes, nonlinear programming, optimal downlink scheduling scheme, optimal scheduler, optimisation, radio resource allocation, resource allocation, scheduling, telecommunication traffic, total transmission bit rate, transmit power

The problem of allocating radio resources in the downlink of a CDMA network is studied. The modulation and coding schemes, numbers of multicodes, and transmit powers used for all mobile stations (MS's) are jointly chosen so as to maximize the total transmission bit rate, subject to certain constraints. Based on the discrete and nonlinear nature of the proposed model, a mixed-integer nonlinear programming optimization problem is formulated. It is shown that the nonlinear relationship between bit rate and transmit power due to the use of different modulation and coding schemes and the maximum number of multicodes which can be assigned to an MS generally result in an optimal allocation which involves simultaneous transmission to several MS's. In addition, it is shown that the optimal scheduler can yield a significant improvement in throughput by taking the MS traffic loads into account.


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