약 무인 항공기 시장이 증가하게 됨에 따라, 다수의 무인 항공기를 운용하기 위한 무인 항공기 네트워크 기술 표 준화 및 관련 연구가 진행 중에 있다. 하지만 무인 항공기 네트워크의 주파수 대역은 한정적이고, 이동성 등으로 인해 무선 링크 품질이 변화한다. 따라서, 한정된 자원 내에서 효율적이고 공평한 자원 할당을 위해서는 무인 항 공기 네트워크의 구조와 특징을 파악해야 하며, 이를 바탕으로 한 MAC (Medium Access Control) 프로토콜에 대 한 연구가 필요하다. 본 논문에서는 무인 항공기 네트워크에 구조와 특징들에 대해 분석하고, 무인 항공기 네트워 크에 반영된 MAC 프로토콜을 조사·분석한 뒤, 각 프로토콜의 특징을 비교한다. 또한 이들 프로토콜을 분석한 내 용을 바탕으로 무인 항공기 네트워크의 MAC 프로토콜의 개발 방향을 제시한다. ABSTRACTTechnical standardization and study of UAV (Unmanned Aerial Vehicles) networks are being carried out for operating multiple UAVs because of UAV markets expansions. In UAV networks, however, bandwidth is limited and wireless link quality is changed frequently by mobility. Therefore, it is necessary to understand the structure and characteristics of UAV network, and MAC protocol is required based on UAV network needed for efficient and equitable resource allocation mechanism within limited resources. In this paper, we analyze the structure and characteristics of the UAV network and MAC protocols for UAV network, compare the characteristics of each protocol. Finally we propose the development direction of MAC protocol for UAV network based on the previous analysis.※ 본 연구는 ㈜ 한화시스템의 지원으로 수행되었습니다.
traffic that can satisfy QoS requirement for application. In addition, it is necessary for traffic offloading using social context due to large traffic from SNS. Thus, we propose the LIPA/SIPTO offloading algorithm using social context. We define the application selection probability using social context, the application popularity.Then, we find the optimal offloading weighting factor to maximize the QoS(Quality of Service) of small cell users in term of effective data rate. Finally, we determine the offloading ratio by this application selection probability and optimal offloading weighting factor. By performance analysis, the effective data rate achievement ratio of the proposed algorithm is similar with the conventional one although the total offloading ratio of the proposed algorithm is about 46 percent of the conventional one.
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