中国邮电高校学报(英文) ›› 2007, Vol. 14 ›› Issue (1): 22-26.doi: 1005-8885 (2007) 01-0022-04

• Wireless • 上一篇    下一篇

Adaptive vertical handoff algorithm in heterogeneous networks

XIE Sheng-dong, WU Meng   

  1. Communication and Information Engineering Institute,
    Nanjing University of Posts and Telecommunications, Nanjing 210003, China
  • 收稿日期:2006-08-28 修回日期:1900-01-01 出版日期:2007-03-30
  • 通讯作者: XIE Sheng-dong

Adaptive vertical handoff algorithm in heterogeneous networks

XIE Sheng-dong, WU Meng   

  1. Communication and Information Engineering Institute,
    Nanjing University of Posts and Telecommunications, Nanjing 210003, China
  • Received:2006-08-28 Revised:1900-01-01 Online:2007-03-30
  • Contact: XIE Sheng-dong

摘要:

The integration of cellular network (CN) and wireless local area network (WLAN) is the trend of the next generation mobile communication systems, and nodes will handoff between the two kinds of networks. The received signal strength (RSS) is the dominant factor considered when handoff occurs. In order to improve the handoff efficiency, this study proposes an adaptive decision algorithm for vertical handoff on the basis of fast Fourier transform (FFT). The algorithm makes handoff decision after analyzing the signal strength fluctuation which is caused by slow fading through FFT. Simulations show that the algorithm reduces the number of handoff by 35%, shortens the areas influenced by slow fading, and enables the nodes to make full use of WLAN in communication compared with traditional algorithms.

关键词:

vertical;handoff,;signal;strength,;slow;fading,;fast;Fourier;transform

Abstract:

The integration of cellular network (CN) and wireless local area network (WLAN) is the trend of the next generation mobile communication systems, and nodes will handoff between the two kinds of networks. The received signal strength (RSS) is the dominant factor considered when handoff occurs. In order to improve the handoff efficiency, this study proposes an adaptive decision algorithm for vertical handoff on the basis of fast Fourier transform (FFT). The algorithm makes handoff decision after analyzing the signal strength fluctuation which is caused by slow fading through FFT. Simulations show that the algorithm reduces the number of handoff by 35%, shortens the areas influenced by slow fading, and enables the nodes to make full use of WLAN in communication compared with traditional algorithms.

Key words:

vertical handoff;signal strength;slow fading;fast Fourier transform

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