Acta Metallurgica Sinica(English letters) ›› 2007, Vol. 14 ›› Issue (1): 22-26.doi: 1005-8885 (2007) 01-0022-04

• Wireless • Previous Articles     Next Articles

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

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

CLC Number: