A tree partitioning dynamic policy for OVSF codes assignment in wideband CDMA

This paper proposes some novel techniques to accommodate users with different rate requirements in a wideband code-division multiple-access system employing orthogonal variable spreading factor codes. Two simple static code assignment strategies are first considered, and an improvement based on mult...

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Veröffentlicht in:	IEEE transactions on wireless communications 2004-07, Vol.3 (4), p.1013-1017
Hauptverfasser:	Dell'Amico, M., Maffioli, F., Merani, M.L.
Format:	Artikel
Sprache:	eng
Schlagworte:	3G mobile communication Access methods and protocols, osi model Applied sciences Downlink Dynamical systems Dynamics Error correction Error correction codes Exact sciences and technology Heuristic algorithms Land mobile radio Multiaccess communication Multimedia systems Partitioning Partitioning algorithms Spreading Strategy Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Teleprocessing networks. Isdn Teletraffic Trees Wideband Wireless communication
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Beschreibung
Zusammenfassung:	This paper proposes some novel techniques to accommodate users with different rate requirements in a wideband code-division multiple-access system employing orthogonal variable spreading factor codes. Two simple static code assignment strategies are first considered, and an improvement based on multicode assignment. Then the new idea of tree partitioning is introduced and used to devise a dynamic code reassignment algorithm. The behavior of these different techniques is experimentally investigated, in terms of call blocking probability and number of required reassignments. The tree partitioning method exhibits very good performances.
ISSN:	1536-1276 1558-2248
DOI:	10.1109/TWC.2004.827768