Efficient OVSF Code Assignment and Reassignment Strategies in UMTS
IEEE Transactions on Mobile Computing
Multiple OVSF codes assignment with crowded branch first strategy in WCDMA systems
ICCOM'07 Proceedings of the 11th Conference on 11th WSEAS International Conference on Communications - Volume 11
Efficient integration OVSF code management strategies in UMTS
Computer Communications
Call elapsed time and reduction in code blocking for WCDMA networks
SoftCOM'09 Proceedings of the 17th international conference on Software, Telecommunications and Computer Networks
EURASIP Journal on Wireless Communications and Networking
Efficient OVSF code assignment strategy in UMTS with multiple codes
ACOS'06 Proceedings of the 5th WSEAS international conference on Applied computer science
Code scattering and reduction in OVSF code blocking for 3G and beyond mobile communication systems
WSEAS TRANSACTIONS on COMMUNICATIONS
Fair Single Code and Multi Code Designs for 3G and Beyond CDMA Systems
Wireless Personal Communications: An International Journal
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In universal terrestrial radio access (UTRA) systems, orthogonal variable spreading factor (OVSF) codes are used to support different transmission rates for different users. In this paper, we first define the flexibility index to measure the capability of an assignable code set in supporting multirate traffic classes. Based on this index, two single-code assignment schemes, nonrearrangeable and rearrangeable compact assignments, are proposed. Both schemes can offer maximal flexibility for the resulting code tree after each code assignment. We then present an analytical model and derive the call blocking probability, system throughput and fairness index. Analytical and simulation results show that the proposed schemes are efficient, stable and fair.