Title :
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
fDate :
7/1/2004 12:00:00 AM
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;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2004.827768
