CAJ | 학술논문

由于DTN低节点密度和网络拓扑结构的不断变化等特性，DTN网络中一般不存在端到端的连接，因此，DT N网络中采取“储存-携带-转发”的方式传输报文。同时为了提高DT N网络中报文的递交率，一个报文在网络中通常存在多个拷贝。当网络节点的缓存有限时，缓存策略就在很大程度上影响了DT N网络路由算法效率。文章提出了一种基于区域的缓存区管理策略，其对网络区域进行划分，通过估计报文在各个区域中数目以及对节点的运动特性进行分析来决定丢弃报文的顺序。仿真实验结果显示，与其他缓存区管理策略相比，所提出的策略可以明显地提高递交率和降低网络开销。
유우DTN저절점밀도화망락탁복결구적불단변화등특성，DTN망락중일반불존재단도단적련접，인차，DT N망락중채취“저존-휴대-전발”적방식전수보문。동시위료제고DT N망락중보문적체교솔，일개보문재망락중통상존재다개고패。당망락절점적완존유한시，완존책략취재흔대정도상영향료DT N망락로유산법효솔。문장제출료일충기우구역적완존구관리책략，기대망락구역진행화분，통과고계보문재각개구역중수목이급대절점적운동특성진행분석래결정주기보문적순서。방진실험결과현시，여기타완존구관리책략상비，소제출적책략가이명현지제고체교솔화강저망락개소。
Due to the low node density and unpredictable network topology ,the end-to-end paths can hardly be maintained in delay-tolerant networks(DTN) ,so the storage-carry-forward paradigm is a-dopted to deliver messages in DTN .Meanwhile ,In order to improve the delivery ratio of the mes-sage ,there is more than one copy of a message in the network .The buffer management scheme large-ly affects the efficiency of the routing algorithm w hen the nodes have finite buffers .In this paper ,an area-based buffer management policy is proposed .T his scheme determines the order of discarded mes-sages by estimating the number of messages in different divided areas and analyzing the motion charac-teristics of the node .The simulation results show that the proposed scheme can apparently improve the delivery ratio and decrease the overhead ratio compared with other buffer management schemes .