향후 이동/무선통신 시스템 환경은 다양한 액세스 네트워크가 서로 연동하여 동작하는 형태로 진화할 것이며, 이동단말은 여러 형태의 액세스 네트워크에서 동작할 수 있는 다중모드 단말로 진화할 것으로 예상된다. 이를 위해서 네트워크 측면에서는 다양한 액세스 네트워크를 연동하여 자원을 효율적으로 사용할 수 있는 기술이 요구되고 있으며, 이동단말의 경우 서비스 및 사용자의 요구사항에 적합한 액세스 네트워크를 선택하여 서비스를 받기 위한 기술들이 요구되었다[1]. 또, 액세스 네트워크를 구성하는 각각의 기능 노드들은 지속적으로 환경을 인지하고 각각의 기능 노드가 이를 기반으로 최적의 파라메터를 설정하여 동작하는 CR(Cognitive Radio)에 대한 개념이 도입되어 이동 및 무선통신 시스템의 지능화가 진행 중에 있다.
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