Downlink scheduling optimization in CDMA networks

TitleDownlink scheduling optimization in CDMA networks
Publication TypeJournal Article
Year of Publication2004
AuthorsKwan, R., and C. Leung
JournalCommunications Letters, IEEE
Pagination611 - 613
Date Publishedoct.
Keywords3G mobile communication, bandwidth allocation, CDMA networks, code division multiple access, code-division multiple access, coding, discrete nonlinear model, downlink scheduling optimization, integer programming, mixed-integer nonlinear programming, mobile stations, modulation, modulation coding, multicodes, nonlinear programming, optimal allocation, radio resource allocation, scheduling, simultaneous transmissions, telecommunication traffic, throughput, traffic loads, transmission bit rate maximization, transmit powers

The problem of allocating radio resources in the downlink of a code-division multiple access (CDMA) network is studied. The modulation and coding schemes, numbers of multicodes, and transmit powers used for all mobile stations (MS) 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 optimal allocation generally involves simultaneous transmissions to several MS. A scheduler which uses knowledge of MS traffic loads is also proposed and shown to yield a significant improvement in throughput.


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