Integrated rate and error control in variable spreading gain WCDMA systems

TitleIntegrated rate and error control in variable spreading gain WCDMA systems
Publication TypeConference Paper
Year of Publication2001
AuthorsKim, D. I., E. Hossain, and V. K. Bhargava
Conference NameCommunications, 2001. ICC 2001. IEEE International Conference on
Pagination1362 -1366 vol.5
Keywordsbroadband networks, cellular radio, cellular wireless network, channel models, code division multiple access, computational complexity, heterogeneous traffic load, integrated rate/error control, inter-cell interference, mean-sense approach, mobile stations, multiuser channels, NP-complete problem, optimal dynamic rate allocation, optimisation, packet radio networks, packet-switched cellular CDMA network, radio links, radiofrequency interference, sub-optimal dynamic rate selection, telecommunication traffic, two-step rate selection, uplink packet data transmission, variable rate packet data transmission, variable spreading gain, WCDMA systems, wideband code division multiple access

Optimal dynamic rate allocation among mobile stations for variable rate packet data transmission in a cellular wireless network is an NP-complete problem; therefore, sub-optimal solutions to this problem are sought. Again, interference calculation is non-trivial in the case of a packet-switched cellular CDMA network with heterogeneous traffic load in different cells. In this paper, a sub-optimal two-step dynamic rate selection procedure is proposed for uplink packet data transmission in cellular WCDMA (wideband code division multiple access) networks. A novel `mean-sense' approach for inter-cell interference calculation is employed assuming homogeneous traffic load in the different cells. Two different error control alternatives for this variable rate packet transmission environment are presented and their performances are analyzed for three different channel models. The performance of the proposed two-step rate selection procedure is fairly close to that of the optimal rate allocation found through exhaustive search


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