인지무선 네트워크에서 그룹 기반 VoIP 서비스 제공 방법
Group-based VoIP Service Provision in Cognitive Radio Networks
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초록
인지무선 네트워크 (Cognitive Radio Network, CRN)는 주 사용자(Primary User, PU)의 동적인 활동성 변화에 따라, 부 사용자(Secondary User, SU)에게 가용한 자원의 양이 변하게 되고 제한적이다. CRN에서 실시간성을 요구하는 서비스를 지원하기 위한 많은 연구가 수행되었으나, 여전히 해결하여야 할 문제들이 존재한다. 본 논문에서는 CRN 환경에서 SU들을 그룹화하여 운영하는 것을 기반으로 하는 GPO-MAC (Group-based Preemptive Opportunistic Medium Access Control) 프로토콜을 제안한다. 제안하는 GPO-MAC은 다중의 PU 채널들과 공통제어채널 (Common Control Channel, CCC)을 사용하며, VoIP (Voice over IP) 서비스의 요구 품질을 충족시키면서 CRN 자원의 가용성을 증대시킬 수 있다. 또한, 제안하는 GPO-MAC 프로토콜의 효과적인 동작을 위한 설계 방법을 제시한다. 실험을 통하여 그룹화를 수행함이 VoIP 서비스의 CRN 대역폭 이용률을 크게 높이고, QoS 성능 향상을 이룰 수 있음을 보였다.
Abstract
In Cognitive Radio Networks (CRNs), the amount of resources available to secondary users (SUs) changes and is limited according to the dynamic activities of the primary users (PUs). Though numerous studies have been conducted to support real-time services in CRNs, problems still exist to be solved. This paper proposes a GPO-MAC (Group-based Preemptive Opportunistic Medium Access Control) protocol based on grouping SUs in CRN environments. The proposed GPO-MAC utilizes a common control channel (CCC) and multiple PU channels, and can improve the resource availabilities while the requirements on the quality of services (QoS) for VoIP (Voice over IP) services are met. Besides, a method for designing the effective operations of the proposed GPO-MAC protocol is also presented. Through experiments, it was shown that with the group-based operation, we can achieve the QoS performance improvement by greatly increasing the CRN bandwidth utilization rate for VoIP services.
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