NDLI: Efficient selection of OVSF codes for the downlink DCH in WCDMA

Content Provider	IEEE Xplore Digital Library
Author	Skoutas, D.N. Rouskas, A.N.
Copyright Year	2004
Description	Author affiliation: Dept. of Inf. & Commun. Syst. Eng., Univ. of the Aegean, Samos, Greece (Skoutas, D.N.; Rouskas, A.N.)
Abstract	We examine the problem of unmovable dedicated channels (DCH) at the forward link in 3G mobile communications systems employing WCDMA. An unmovable DCH is defined as one which cannot be reallocated to another OVSF (orthogonal variable spreading factor) code because it is related to some service with very strict delay requirements. The relatively high total signaling delay for a single OVSF code reassignment makes the reallocation of such channels impractical. Therefore, a reassignment procedure that involves unmovable DCH channels cannot be performed. This is a very significant problem, since the complete elimination of code blocking is accomplished only if a code reassignment procedure can always be performed. We introduce a code selection scheme, named selective fewer codes blocked (S-FCB), which takes into account the different delay requirements of incoming calls during the assignment process and avoids the scattering of unmovable DCHs across the OVSF code tree. Thus the effectiveness of the code reassignment procedure is increased and code blocking is significantly decreased.
Starting Page	1954
Ending Page	1958
File Size	332608
Page Count	5
File Format	PDF
ISBN	0780382552
ISSN	15502252
DOI	10.1109/VETECS.2004.1390615
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-05-17
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Downlink Multiaccess communication Delay Scattering Systems engineering and theory 3G mobile communication Binary trees
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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