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An Efficient Context-aware Opportunistic Routing Protocol
Dong Yeong Seo(서동영),Yun Won Chung(정윤원) 대한전기학회 2016 전기학회논문지 Vol.65 No.12
Opportunistic routing is designed for an environment where there is no stable end-to-end routing path between source node and destination node, and messages are forwarded via intermittent contacts between nodes and routed using a store-carry-forward mechanism. In this paper, we consider PRoPHET(Probabilistic Routing Protocol using History of Encounters and Transitivity) protocol as a base opportunistic routing protocol and propose an efficient context-aware opportunistic routing protocol by using the context information of delivery predictability and node type, e.g., pedestrian, car, and tram. In the proposed protocol, the node types of sending node and receiving node are checked. Then, if either sending node or receiving node is tram, messages are forwarded by comparing the delivery predictability of receiving node with predefined delivery predictability thresholds depending on the combination of sending node and receiving node types. Otherwise, messages are forwarded if the delivery predictability of receiving node is higher than that of sending node, as defined in PRoPHET protocol. Finally, we analyze the performance of the proposed protocol from the aspect of delivery ratio, overhead ratio, and delivery latency. Simulation results show that the proposed protocol has better delivery ratio, overhead ratio, and delivery latency than PRoPHET protocol in most of the considered simulation environments.
전달 노드의 특성을 이용한 효과적인 지연 허용 네트워크 라우팅 프로토콜
서동영(Dong-Yeong Seo),정윤원(Yun-Won Chung) 한국정보기술학회 2019 한국정보기술학회논문지 Vol.17 No.11
In Delay Tolerant Networks (DTN), messages are delivered through the opportunistic contacts between neighboring nodes, even though there is no stable end-to-end routing path between a source node and a destination node. In this paper, an efficient DTN routing protocol is proposed by considering the different characteristics of message forwarding nodes. To this end, the proposed protocol with message forwarding nodes like pedestrian, car, and tram, uses the characteristics of car with more buffer storage, higher speed, and wider coverage area than pedestrian efficiently. Performance analysis results through simulation show that the proposed protocol has maximum 2.4% higher delivery ratio, maximum 17.5% lower overhead ratio, and maximum 4.9% lower delivery latency than conventional protocol.
목적지 노드로의 메시지 전달 횟수를 이용한 향상된 PRoPHET 프로토콜
박순호(Soon Ho Park),서동영(Dong Yeong Seo),정윤원(Yun Won Chung) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.6
In delay tolerant network environment, communication infrastructure does not exist and connectivity between a source node and a destination node is not guaranteed, and thus, messages are delivered using a store-carry-forward way. In PRoPHET (probabilistic routing protocol for intermittently connected networks) protocol, which is a representative delay network protocol, each node calculates delivery predictability to a node using contact information with other nodes, and forwards a message to a node with higher delivery predictability to a destination node. In this paper, we propose an improved PRoPHET protocol considering message delivery count to destination nodes as well as delivery predictability to forward a message. Performance analysis results show that the proposed protocol has better delivery ratio and overhead ratio than conventional PRoPHET protocol.
메시지 복사 제한을 통한 향상된 PRoPHET 라우팅 프로토콜
임현호(Hyeon Ho Lim),서동영(Dong Yeong Seo),정윤원(Yun Won Chung) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.6
Delay tolerant network is a network where messages are delivered using a store-carry-forward way in an environment that end-to-end connectivity between source node and destination node is not guaranteed. In PRoPHET(Probabilistic Routing Protocol using History of Encounters and Transitivity) protocol, which is a representative delay tolerant network protocol, a message is forwarded after duplication to a node with a higher delivery predictability to a destination node of the message. In this paper, an improved PRoPHET routing protocol through the restriction of message duplication is proposed, where the number of forwarding of a message is counted and restricted by a threshold value. Performance analysis results show that the proposed protocol has better delivery ratio and delivery latency for most of threshold values and better overhead ratio for all threshold values than PRoPHET protocol.