Yang, Y and Yum, TSP (2004) Maximally Flexible Assignment of Orthogonal Variable Spreading Factor Codes for Multi-Rate Traffic. IEEE Transactions on Wireless Communications , 3 (3) 781 - 792. 10.1109/TWC.2004.827765.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Maximally Flexible Assignment of Orthogonal Variable Spreading Factor Codes for Multi-Rate Traffic |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TWC.2004.827765 |
| Keywords: | Code assignment, orthogonal variable spreading factor (OVSF) code, universal terrestrial radio access (UTRA) |
| UCL classification: | UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering |
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