An OVSF code tree partition policy for WCDMA systems based on the multi-code approach

H. W. Ferng; Hao Lun Chin; D. Shiung; Ying Tsung Chen

doi:10.1109/VETECF.2005.1558120

An OVSF code tree partition policy for WCDMA systems based on the multi-code approach

H. W. Ferng, Hao Lun Chin, D. Shiung, Ying Tsung Chen

Graduate Institute of Communication Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

15 Citations (Scopus)

Abstract

Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.

Original language	English
Title of host publication	VTC 2005-Fall
Subtitle of host publication	Mid Way Through the Decade - Technology Past, Present and Future
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1212-1216
Number of pages	5
ISBN (Electronic)	0780391527
DOIs	https://doi.org/10.1109/VETECF.2005.1558120
Publication status	Published - 2005 Jan 1
Event	62nd Vehicular Technology Conference, VTC 2005 - Dallas, United States Duration: 2005 Sep 25 → 2005 Sep 28

Publication series

Name	IEEE Vehicular Technology Conference
Volume	2
ISSN (Print)	1550-2252

Other

Other	62nd Vehicular Technology Conference, VTC 2005
Country	United States
City	Dallas
Period	05-09-25 → 05-09-28

All Science Journal Classification (ASJC) codes

Computer Science Applications
Electrical and Electronic Engineering
Applied Mathematics

Access to Document

10.1109/VETECF.2005.1558120

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Ferng, H. W., Chin, H. L., Shiung, D., & Chen, Y. T. (2005). An OVSF code tree partition policy for WCDMA systems based on the multi-code approach. In VTC 2005-Fall: Mid Way Through the Decade - Technology Past, Present and Future (pp. 1212-1216). [1558120] (IEEE Vehicular Technology Conference; Vol. 2). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/VETECF.2005.1558120

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abstract = "Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.",

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Ferng, HW, Chin, HL, Shiung, D & Chen, YT 2005, An OVSF code tree partition policy for WCDMA systems based on the multi-code approach. in VTC 2005-Fall: Mid Way Through the Decade - Technology Past, Present and Future., 1558120, IEEE Vehicular Technology Conference, vol. 2, Institute of Electrical and Electronics Engineers Inc., pp. 1212-1216, 62nd Vehicular Technology Conference, VTC 2005, Dallas, United States, 05-09-25. https://doi.org/10.1109/VETECF.2005.1558120

An OVSF code tree partition policy for WCDMA systems based on the multi-code approach. / Ferng, H. W.; Chin, Hao Lun; Shiung, D.; Chen, Ying Tsung.

VTC 2005-Fall: Mid Way Through the Decade - Technology Past, Present and Future. Institute of Electrical and Electronics Engineers Inc., 2005. p. 1212-1216 1558120 (IEEE Vehicular Technology Conference; Vol. 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - Orthogonal variable spreading factor (OVSF) codes for wide-band CDMA (WCDMA) systems have been proposed in the third generation (3G) mobile communications' standard to support services of variable rates. To assign OVSF codes, there are single-code and multi-code approaches. In this paper, the multi-code placement and replacement issue is addressed. We propose a tree partition policy for managing the OVSF code tree to reduce code fragments and the number of code reassignments. Besides, we adjust the multi-code rate according to a unit-based method, which is capable of decreasing the number of code fragments because fewer low-rate codes are utilized. Through extensive simulations, it turns out that the tree partition policy and the unit-based multi-code method jointly perform better than the left-most and crowded-first schemes.

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Ferng HW, Chin HL, Shiung D, Chen YT. An OVSF code tree partition policy for WCDMA systems based on the multi-code approach. In VTC 2005-Fall: Mid Way Through the Decade - Technology Past, Present and Future. Institute of Electrical and Electronics Engineers Inc. 2005. p. 1212-1216. 1558120. (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VETECF.2005.1558120