AN INTEGRATED COGNITIVE RADIO SYSTEM AND METHOD FOR QUALITY OF SERVICE GUARANTEED VOICE OVER IP COMMUNICATION WITH ENHANCED SPECTRUM UTILIZATION

摘要

The present invention develops an integrated Cognitive Radio (CR) system and method for Quality of Service (QoS) guaranteed Voice over IP (VoIP) communication to support higher number of users with increased spectrum utilization using CR technology and cost- effective IP-based VoIP communication for wireless networks. Challenges of this invention include parameterization in VoIP and CR domain and development of robust CR methods in dynamic environment CR methods are formulated and implemented to develop and characterize individual QoS guaranteed CR Users, including determination of critical system parameters. A real- time performance evaluating system is also developed to monitor Primary and CR users traffic (throughput, packet-loss ratio) and QoS (delay, jitter, Mean Opinion Score) metrics. This invention of VoIP over CR system is applicable for implementing VoIP as a service to emerging IP based social networking, gaming, interactive multimedia and streaming services with the ultimate aim of reducing spectrum congestion in existing wireless networks.