{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T05:21:55Z","timestamp":1782969715850,"version":"3.54.5"},"reference-count":26,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2021,6,7]],"date-time":"2021-06-07T00:00:00Z","timestamp":1623024000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61971054"],"award-info":[{"award-number":["61971054"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Recently, many Low Earth Orbit (LEO) satellite networks are being implemented to provide seamless communication services for global users. Since the high mobility of LEO satellites, handover strategy has become one of the most important topics for LEO satellite systems. However, the limited on-board caching resource of satellites make it difficult to guarantee the handover performance. In this paper, we propose a multiple attributes decision handover strategy jointly considering three factors, which are caching capacity, remaining service time and the remaining idle channels of the satellites. Furthermore, a caching-aware intelligent handover strategy is given based on the deep reinforcement learning (DRL) to maximize the long-term benefits of the system. Compared with the traditional strategies, the proposed strategy reduces the handover failure rate by up to nearly 81% when the system caching occupancy reaches 90%, and it has a lower call blocking rate in high user arrival scenarios. Simulation results show that this strategy can effectively mitigate handover failure rate due to caching resource occupation, as well as flexibly allocate channel resources to reduce call blocking.<\/jats:p>","DOI":"10.3390\/rs13112230","type":"journal-article","created":{"date-parts":[[2021,6,7]],"date-time":"2021-06-07T22:23:00Z","timestamp":1623104580000},"page":"2230","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Caching-Aware Intelligent Handover Strategy for LEO Satellite Networks"],"prefix":"10.3390","volume":"13","author":[{"given":"Tao","family":"Leng","sequence":"first","affiliation":[{"name":"School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT), Beijing 100876, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2738-4078","authenticated-orcid":false,"given":"Yuanyuan","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT), Beijing 100876, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaofeng","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT), Beijing 100876, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weidong","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China"},{"name":"Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications(BUPT), Beijing 100876, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,7]]},"reference":[{"key":"ref_1","first-page":"1","article-title":"A survey of 5G network systems: Challenges and machine learning approaches","volume":"12","author":"Fourati","year":"2020","journal-title":"Int. J. Mach. Learn. Cybern."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1109\/MNET.2018.1800037","article-title":"Satellite-5G integration: A network perspective","volume":"32","author":"Giambene","year":"2018","journal-title":"IEEE Netw."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"156","DOI":"10.23919\/JCC.2020.12.011","article-title":"System integration of terrestrial mobile communication and satellite communication\u2014The trends, challenges and key technologies in B5G and 6G","volume":"17","author":"Chen","year":"2020","journal-title":"China Commun."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"70","DOI":"10.1109\/COMST.2020.3028247","article-title":"Satellite Communications in the New Space Era: A Survey and Future Challenges","volume":"23","author":"Kodheli","year":"2021","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s11432-020-2955-6","article-title":"Towards 6G wireless communication networks: Vision, enabling technologies, and new paradigm shifts","volume":"64","author":"You","year":"2021","journal-title":"Sci. China Inf. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/j.actaastro.2019.03.040","article-title":"A technical comparison of three low Earth orbit satellite constellation systems to provide global broadband","volume":"159","author":"Portillo","year":"2019","journal-title":"Acta Astronaut."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1109\/COMST.2016.2603518","article-title":"Optical communication in space: Challenges and mitigation techniques","volume":"19","author":"Kaushal","year":"2017","journal-title":"IEEE Commun. Surv. Tutor."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2213","DOI":"10.1109\/LCOMM.2016.2604311","article-title":"Performance analysis of correlated handover service in LEO mobile satellite systems","volume":"20","author":"Musumpuka","year":"2016","journal-title":"IEEE Commun. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1002\/sat.783","article-title":"Satellite handover techniques for LEO networks","volume":"22","author":"Papapetrou","year":"2004","journal-title":"Int. J. Satell. Commun. Netw."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1002\/sat.1250","article-title":"Velocity-aware handover prediction in LEO satellite communication networks","volume":"36","author":"Hu","year":"2018","journal-title":"Int. J. Satell. Commun. Netw."},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Duan, C., Jing, F., Chang, H., Song, B., and Xu, Z. (2018, January 21\u201325). A novel handover control strategy combined with multi-hop routing in LEO Satellite Networks. Proceedings of the 2018 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW), Vancouver, BC, Canada.","DOI":"10.1109\/IPDPSW.2018.00132"},{"key":"ref_12","unstructured":"Seyedi, Y., and Wu, Z. (2015, January 19\u201321). A simple real-time handover management in the mobile satellite communication networks. Proceedings of the IEEE 2015 17th Asia-Pacific Network Operations and Management Symposium, Busan, Korea."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/JSEE.2015.00001","article-title":"Dynamic channel reservation scheme based on priorities in LEO satellite systems","volume":"26","author":"Zhou","year":"2015","journal-title":"J. Syst. Eng. Electr."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1547","DOI":"10.1109\/LCOMM.2016.2569099","article-title":"A graph-based satellite handover framework for LEO satellite communication networks","volume":"20","author":"Wu","year":"2016","journal-title":"IEEE Commun. Lett."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"42768","DOI":"10.1109\/ACCESS.2020.2977831","article-title":"Forecast based handover in an extensible multi-layer LEO mobile satellite system","volume":"8","author":"Li","year":"2020","journal-title":"IEEE Access"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1904","DOI":"10.1109\/LWC.2020.3007818","article-title":"A user-centric handover scheme for ultra-dense LEO satellite networks","volume":"9","author":"Li","year":"2020","journal-title":"IEEE Wireless Commun. Lett."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"133641","DOI":"10.1109\/ACCESS.2019.2941217","article-title":"A satellite handover strategy based on the potential game in LEO satellite networks","volume":"7","author":"Wu","year":"2019","journal-title":"IEEE Access"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"He, S., Wang, T., and Wang, S. (2020, January 7\u201311). Load-Aware satellite handover strategy based on multi-Agent reinforcement learning. Proceedings of the 2020 IEEE Global Communications Conference, Taipei, Taiwan.","DOI":"10.1109\/GLOBECOM42002.2020.9322449"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Miao, J., Wang, P., Yin, H., Chen, N., and Wang, X. (2019, January 6\u20139). A multi-attribute decision handover acheme for LEO mobile satellite networks. Proceedings of the IEEE 5th International Conference on Computer and Communications, Chengdu, China.","DOI":"10.1109\/ICCC47050.2019.9064377"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Zhang, S.B., Liu, A.J., and Liang, X.H. (2020, January 11\u201314). A multi-objective satellite handover strategy based on entropy in LEO satellite communications. Proceedings of the IEEE 6th International Conference on Computer and Communications, Chengdu, China.","DOI":"10.1109\/ICCC51575.2020.9344916"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"10127","DOI":"10.1109\/TVT.2020.3000908","article-title":"QoE-driven intelligent handover for user-centric mobile satellite networks","volume":"69","author":"Xu","year":"2020","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"6757","DOI":"10.1109\/ACCESS.2017.2685434","article-title":"A survey on mobile edge networks: Convergence of computing, caching and communications","volume":"5","author":"Wang","year":"2017","journal-title":"IEEE Access"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"300","DOI":"10.1109\/LCOMM.2017.2771434","article-title":"Distributed caching based on matching game in LEO satellite constellation networks","volume":"22","author":"Liu","year":"2018","journal-title":"IEEE Commun. Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"5871","DOI":"10.1109\/TVT.2019.2907682","article-title":"Deep Q-learning aided networking, caching, and computing resources allocation in software-defined satellite-terrestrial networks","volume":"68","author":"Qiu","year":"2019","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_25","first-page":"189","article-title":"Joint optimization of satisfaction index and spectrum efficiency with cache restricted for resource allocation in multi-beam satellite systems","volume":"16","author":"Zhang","year":"2019","journal-title":"China Commun."},{"key":"ref_26","unstructured":"Hasselt, H.V., Guez, A., and Silver, D. (2016, January 12\u201317). Deep Reinforcement Learning with Double Q-learning. Proceedings of the Thirtieth AAAI Conference on Artificial Intelligence, Phoenix, AZ, USA."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/11\/2230\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T06:11:42Z","timestamp":1760163102000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/11\/2230"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,6,7]]},"references-count":26,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2021,6]]}},"alternative-id":["rs13112230"],"URL":"https:\/\/doi.org\/10.3390\/rs13112230","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,6,7]]}}}