A vertical handoff algorithm based on context information in CDMA-WLAN integrated networks

  • Authors:

  • Jang-Sub Kim;Min-Young Chung;Dong-Ryeol Shin

  • Affiliations:

  • School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea;School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea;School of Information and Communication Engineering, Sungkyunkwan University, Suwon, Korea

  • Venue:
  • ICCSA'05 Proceedings of the 2005 international conference on Computational Science and its Applications - Volume Part I
  • Year:
  • 2005

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Abstract

The integration of CDMA cellular network and wireless LAN (WLAN) has drawn much attention recently. In this integrated architecture, it is required to support a vertical handoff from the WLAN to the CDMA system when a user moves out of the WLAN coverage area and vice versa. We propose a context based handoff procedure and the corresponding mechanism from WLAN to CDMA system, and vice versa, based on wireless channel assignment. In other words, this paper focuses on the handoff decision which uses context information such as dropping probability, blocking probability, GOS, the number of handoff attempts and velocity. As a decision criterion, velocity threshold is determined to optimize the system performance. The optimal velocity threshold is adjusted to assign available channels to the mobile stations with various handoff strategies. The proposed scheme is validated using computer simulation. Also, the overflow traffic with take-back technique is evaluated and compared with non-overflow traffics in terms of GOS.