A novel vertical handoff algorithm based on fuzzy logic in aid of grey prediction theory in wireless heterogeneous networks

To coordinate the various access technologies in the 4G communication system, intelligent vertical handoff algorithms are required. This paper mainly deals with a novel vertical handoff decision algorithm based on fuzzy logic with the aid of grey theory and dynamic weights adaptation. The grey prediction theory (GPT) takes 4 sampled received signal strengths as input parameters, and calculates the predicted received signal strength in order to reduce the call dropping probability. The fuzzy logic theory based quantitative decision algorithm takes 3 quality of service (QoS) metric, received signal strength (RSS), available bandwidth (BW), and monetary cost (MC) of candidate networks as input parameters. The weight of each QoS metrics is adjusted along with the networks changing to trace the network condition. The final optimized vertical handoff decision is made by comparing the quantitative decision values of the candidate networks. Simulation results demonstrate that the proposed algorithm provides high performance in heterogeneous as well as homogeneous network environments.

[1]  Randy H. Katz,et al.  Vertical handoffs in wireless overlay networks , 1998, Mob. Networks Appl..

[2]  Muhammed Salamah,et al.  On the vertical handoff decision for wireless overlay networks , 2006, 2006 International Symposium on Computer Networks.

[3]  Babak Hossein Khalaj,et al.  Grey Prediction Based Handoff Algorithm , 2007 .

[4]  Ian F. Akyildiz,et al.  Mobility Management in Next Generation Wireless Systems , 1999, ICCCN.

[5]  Janise McNair,et al.  Vertical handoffs in fourth-generation multinetwork environments , 2004, IEEE Wireless Communications.

[6]  Shiann-Tsong Sheu,et al.  Using grey prediction theory to reduce handoff overhead in cellular communication systems , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[7]  Upkar Varshney,et al.  Issues in Emerging 4G Wireless Networks , 2001, Computer.

[8]  Babak Hossein Khalaj,et al.  An adaptive fuzzy logic based handoff algorithm for interworking between WLANs and mobile networks , 2002, The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications.

[9]  Chen He,et al.  A Novel Fuzzy Logic Vertical Handoff Algorithm with Aid of Differential Prediction and Pre-Decision Method , 2007, 2007 IEEE International Conference on Communications.

[10]  Cheng-Jian Lin,et al.  An adaptive fuzzy predictor based handoff algorithm for heterogeneous network , 2004, IEEE Annual Meeting of the Fuzzy Information, 2004. Processing NAFIPS '04..

[11]  He Chen,et al.  Intelligent signal processing of mobility management for heterogeneous networks , 2003, International Conference on Neural Networks and Signal Processing, 2003. Proceedings of the 2003.