{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T02:42:32Z","timestamp":1747190552771,"version":"3.40.5"},"reference-count":24,"publisher":"Wiley","license":[{"start":{"date-parts":[[2021,10,19]],"date-time":"2021-10-19T00:00:00Z","timestamp":1634601600000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Mobile Information Systems"],"published-print":{"date-parts":[[2021,10,19]]},"abstract":"<jats:p>Compared with the stable states of the ground networks, the space-ground integrated networks (SGIN) have limited resources, high transmission delay, and vulnerable topology, which make traditional caching strategies unable to adapt to the complex space network environment. An intelligent and efficient caching strategy is required to improve the edge service capabilities of satellites. Therefore, we investigate these problems in this paper and make the following contributions. First, the content value evaluation model based on classification and regression tree is proposed to solve the problem of \u201cwhat to cache\u201d by describing the cache value of content, which considers the multidimensional content characteristics. Second, we propose a cache decision strategy based on the node caching cost model to answer \u201cwhere to cache.\u201d This strategy modified the genetic algorithm to adapt the 0-1 knapsack problem under SDN architecture, which greatly improved the cache hit rate and the network service quality. Finally, we propose a cache replacement strategy by establishing an effective service time model between the satellite and ground transmission link, which solves the problem of \u201cwhen to replace.\u201d Numerical results demonstrate that the proposed strategy in SGIN can improve the nodes\u2019 cache hit rate and reduce the network transmission delay and transmission hops.<\/jats:p>","DOI":"10.1155\/2021\/7844929","type":"journal-article","created":{"date-parts":[[2021,10,19]],"date-time":"2021-10-19T23:03:17Z","timestamp":1634684597000},"page":"1-13","source":"Crossref","is-referenced-by-count":3,"title":["An Intelligent Caching and Replacement Strategy Based on Cache Profit Model for Space-Ground Integrated Network"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8152-7642","authenticated-orcid":true,"given":"Li","family":"Yang","sequence":"first","affiliation":[{"name":"Automation College, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9678-4000","authenticated-orcid":true,"given":"Cheng","family":"Chi","sequence":"additional","affiliation":[{"name":"Key Laboratory of Communication Network and Information Processing, Dalian University, Dalian 116000, China"},{"name":"College of Information Engineering, Dalian University, Dalian 116000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7457-4902","authenticated-orcid":true,"given":"Chengsheng","family":"Pan","sequence":"additional","affiliation":[{"name":"Nanjing University of Information Science & Technology, Nanjing 210094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0104-3219","authenticated-orcid":true,"given":"Yaowen","family":"Qi","sequence":"additional","affiliation":[{"name":"Automation College, Nanjing University of Science and Technology, Nanjing 210094, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"volume-title":"Cisco Annual Internet Report (2018\u20132023)","year":"2020","author":"Cisco","key":"1"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1109\/surv.2013.070813.00063"},{"article-title":"A data-oriented (and beyond) network architecture","author":"T. 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