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Journal of Information Science and Engineering, Vol. 25 No. 3, pp. 717-731 (May 2009)

Modeling and Analysis of Code-based Call Admission Control for QoS Management in W-CDMA Systems

Sheng-Tzong Cheng and Ming-Tzung Hsieh*
 Department of Computer Science and Information Engineering
National Cheng Kung University
Tainan, 700 Taiwan
*Department of International Business
Kao Yuan University
Kaohsiung, 821 Taiwan

Efficient resource allocation for multi-class traffic with QoS guarantee is an important issue in integrated multimedia mobile communication networks. In the third generation mobile communication systems, the Orthogonal Variable Spreading Factor (OVSF) codes are used as spreading codes. The use of OVSF codes allows the spreading factors to be changed for variable bit-rate requirements. In this paper, we presented the code- based guard channel schemes and analytical models for QoS management in W-CDMA systems. Compared with traditional channel-based schemes, the proposed schemes and analytical models exactly reflect the restrictions of OVSF code tree characteristics and are suitable for W-CDMA systems. From the illustrations and numerical results, we find that the proposed model is easy to construct and to analyze QoS management schemes in W-CDMA systems. It can also be extended to more complicated multi-class traffic types systems.

Keywords: call admission control, code allocation, guard channel, OVSF, QoS, W-CDMA

Full Text (¥þ¤åÀÉ) Retrieve PDF document (200905_04.pdf)

Received February 1, 2008; accepted November 28, 2008.
Communicated by Yau-Hwang Kuo, Pau-Choo Chung and Jar-Ferr Yang.