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

Author

Dell´Amico, Matteo ; Maffioli, Francesco ; Merani, Maria Luisa

Author_Institution

DISMI, Univ. of Modena & Reggio Emilia, Italy

Volume

3

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

1013

Lastpage

1017

Abstract

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.

Keywords

3G mobile communication; broadband networks; code division multiple access; codes; probability; trees (mathematics); UMTS/IMT-2000; Universal Mobile Telecommmunication Systems; call blocking probability; code division multiple access; dynamic code reassignment algorithm; dynamic tree partitioning policy; multicode assignment; orthogonal variable spreading factor code; static code assignment strategy; wideband CDMA; wireless system; 3G mobile communication; Downlink; Error correction; Error correction codes; Heuristic algorithms; Land mobile radio; Multiaccess communication; Multimedia systems; Partitioning algorithms; Wideband; CDMA; Hybrid multicode-variable spreading factor code assignments; OVSF; codes; multirate services; orthogonal variable spreading factor; wideband code-division multiple-access;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2004.827768

Filename

1310290