Code Placement and Replacement Strategies for Wideband CDMA OVSF Code Tree Management
IEEE Transactions on Mobile Computing
Dynamic bandwidth allocation with fair scheduling for WCDMA systems
IEEE Wireless Communications
Dynamic assignment of orthogonal variable-spreading-factor codes in W-CDMA
IEEE Journal on Selected Areas in Communications
Supporting rate guarantee and fair access for bursty data traffic in W-CDMA
IEEE Journal on Selected Areas in Communications
Dynamic bandwidth allocation for 3G wireless systems-A fuzzy approach
Applied Soft Computing
A Cross Layer Scheduling Framework for Supporting Bursty Data Applications in WCDMA Networks
Wireless Personal Communications: An International Journal
EURASIP Journal on Wireless Communications and Networking
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Packet scheduling in a WCDMA system poses a new challenge due to its nature of variable bit rates and location-dependent, time-varying channel conditions. In this work, two new downlink scheduling algorithms for a WCDMA base station are proposed to support multimedia transmissions. With a credit management and a compensation mechanism, our algorithms provide rate guarantee and fair access to the channel. In particular, we propose to allow a user to simultaneously use multiple OVSF codes in a time-sharing manner. Using multiple codes allows us to compensate those users suffering from communication interferences or even errors. Simulation results are presented to verify that the proposed schemes do achieve higher bandwidth utilization while keeping transmission delay low.