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Maximally Flexible Assignment of Orthogonal Variable Spreading Factor Codes for Multi-Rate Traffic

Yang, Y; Yum, TSP; (2004) Maximally Flexible Assignment of Orthogonal Variable Spreading Factor Codes for Multi-Rate Traffic. IEEE Transactions on Wireless Communications , 3 (3) pp. 781-792. 10.1109/TWC.2004.827765. Green open access

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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
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: https://discovery.ucl.ac.uk/id/eprint/13307
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