Mobility

Management Scheme and Optimal MAP Detection Threshold of Packet-Based Cognitive Radio System

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Executive Summary

A Cognitive Radio System (CRS) senses the radio spectrum environment and adaptively use unoccupied spectrum resource. The CRS should optimize between two conflicting goals for different applications. One is the minimization of interference to primary users and the other is the maximization of usage of spectrum opportunities of the secondary users. In this paper, the authors propose a dual-level management scheme that performs spectrum analysis and access decision making at both network level and terminal level. Using this scheme, secondary users obtain the distribution of the silent period and control their sensing performance. A closed-form optimal threshold is obtained using the Maximum A Posteriori (MAP) rule based on the distribution of the silent period of primary users.

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