Fundamentals of queueing theory (2nd ed.).
Fundamentals of queueing theory (2nd ed.).
Exact and approximate algorithms for partially observable markov decision processes
Exact and approximate algorithms for partially observable markov decision processes
Planning and acting in partially observable stochastic domains
Artificial Intelligence
Modeling and analysis for proactive-decision spectrum handoff in cognitive radio networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
IEEE Journal on Selected Areas in Communications
Adaptive sensing scheduling for cognitive radio systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Managing Femto to Macro Interference without X2 Interface Support through POMDP
Mobile Networks and Applications
Optimal Channel Sensing Order for Various Applications in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
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Recent studies have been conducted to indicate the ineffective usage of licensed bands due to the static spectrum allocation. In order to improve the spectrum utilization, the cognitive radio (CR) is therefore suggested to dynamically exploit the opportunistic primary frequency spectrums. How to provide efficient spectrum handoff has been considered a crucial issue in the CR networks. Existing spectrum handoff algorithms assume that all the channels within the network can be correctly sensed by the CR users in order to perform appropriate spectrum hand-off process. However, this assumption is considered impracticable in realistic circumstances primarily due to the excessive time required for the CR user to sense the entire spectrum space. In this paper, the partially observable Markov decision process (POMDP) is exploited to estimate the network information by partially sensing the frequency spectrums. A POMDP-based spectrum handoff (POSH) scheme is proposed to determine the optimal target channel for spectrum handoff according to the partially observable channel state information. By adopting the policy resulted from the POSH algorithm for target channel selection, minimal waiting time at each occurrence of spectrum handoff can be achieved. Numerical results illustrate that the proposed POSH scheme can effectively minimize the required waiting time for spectrum handoff in the CR networks.