Channel-based downlink scheduling schemes for CDMA networks [3G wireless networks]

In this paper, 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 (MSs) can be jointly chosen so as to maximize the total transmission bit rate, subject to certain constraints. Since this joint optimization problem can be computationally complex, a sub-optimal sequential optimization procedure is proposed, in which the resources for each MS are optimized sequentially. Numerical results show that the joint optimization outperforms the sequential optimization substantially when the channel conditions are good. However, under poor channel conditions, the performance improvement is marginal.