天地一体化智能网络节点静态处理与缓存策略  

Node Static Processing and Caching Strategy in Space-Ground Integrated Intelligent Network

作　　者：石怀峰[1,2] 王成功 蔡睿妍 魏德宾[1,2] SHI Huaifeng;WANG Chenggong;CAI Ruiyan;WEI Debin(Key Laboratory of Communication and Network,Dalian University,Dalian,Liaoning 116622,China;College of Automation,Nanjing University of Technology,Nanjing 210094,China)

机构地区：[1]大连大学通信与网络重点实验室,辽宁大连116622 [2]南京理工大学自动化学院,南京210094

出　　处：《计算机工程》2021年第1期30-36,共7页Computer Engineering

基　　金：国家自然科学基金(61722105,61801073)。

摘　　要：天地一体化智能网络中的卫星节点具有计算、存储和传输能力,将内容副本缓存至传输路径上的卫星节点可提高网络缓存收益。针对卫星节点移动导致的路径改变问题,设计基于虚拟位置的卫星节点静态处理机制,先设定卫星的虚拟位置节点,再将内容副本提前向虚拟位置节点同一轨道的后方卫星节点进行缓存。在此基础上,提出基于ProbCache的轻量级分组缓存策略PBP,对路径节点进行分组并划分组内缓存区域,同时按照内容副本流行度阈值实现缓存位置迁移,使得流行度高的内容副本缓存至离请求节点近的区域。实验结果表明,与ProbCache、LCE和LCD等策略相比,PBP策略能有效降低缓存开销及提高内容副本的缓存命中率,具有更好的卫星网络传输性能。The satellite nodes in space-ground integrated intelligent network have computing,storage and transmission capabilities,so network caching can be improved by storing the content copies on the satellite nodes in the transmission path.To address the path changes caused by the moving satellite nodes,this paper proposes a static processing mechanism for satellite nodes based on virtual location.The mechanism sets the virtual location nodes of satellites,and then caches the content copies to the rear satellite nodes in the same orbit of the virtual location nodes in advance.On this basis,a lightweight grouped caching strategy,PBP,is proposed based on ProbCache to group the nodes in the transmission path and divide the storage area in a group.At the same time,the migration of the storage location are determined according to the threshold of the content copies popularity to make the content copies with high popularity cached to the area nearer to the request node.Experimental results show that compared with ProbCache,LCE,LCD and other strategies,the proposed PBP strategy can effectively reduce the caching cost and increase the cache hit rate of content copies,improving the transmission performance of satellite network.

关 键 词：天地一体化智能网络 节点静态处理 内容缓存 缓存策略 缓存性能 

分 类 号：TN915.41[电子电信—通信与信息系统]