由於衛星通訊(Satellite Communication (SatCom))能提供無縫連接及高速傳輸的能力，3GPP建議5G系統與衛星系統互相合作形成5G地面-衛星系統，在5G規範中，使用者端設備(User Equipment, UE)在網路的覆蓋範圍內移動時，可以在地面系統cell和衛星系統cell相互切換以確保5G網路服務的連續性。近來國際間衛星公司爭相發射低軌道衛星以提供網路覆蓋的服務。然而低軌道衛星的高移動性、離地距離過遠帶來的長通訊延遲、低軌道衛星cell覆蓋範圍大、與地面網路共用傳輸頻道等特性為衛星網路支援地面5G網路帶來技術挑戰。本計畫針對上述重要議題提出三年期計畫。第一年主要處理高移動低軌道衛星的Handover機制，以及長通訊延遲下通訊狀況CSI預測。第二年考慮地面網路和衛星共用傳輸頻道的干擾問題。第三年考慮衛星網路安全機制。由於未來低軌道衛星可由民間單位大量發射到地球上空，不再像過去是由國家、軍事單位等發射與管理，而且衛星網路可連結地面網路和所有一般設備，因此衛星網路的安全也是重要議題。由於衛星網路被視為是解決物聯網軟韌體更新的解決方案，本計畫將網路傳輸層通訊安全機制與物聯網軟體更新機制實作於物聯網晶片(ARM)中。 ;Due to seamless connection and high-speed transmission capabilities of Satellite Communication (SatCom), 3GPP recommends that 5G terrestrial systems and satellite systems cooperate to ensure the continuity of 5G network services. Recently, international satellite companies are scrambling to launch low-orbit satellites (LEO) to provide network coverage services. However, satellite-terrestrial networks face tough challenges, including designing handover scheme of high-mobility LEO cells, channel state (CSI) reporting under long-communication-delay LEO networks, and reducing interference between satellite networks and terrestrial networks. This project proposed a three-year plan for the above-mentioned important issues. In the first year, we mainly deal with the handover mechanism and the channel state (CSI) prediction. In the second year, we aim to reduce interference between terrestrial networks and LEO networks. In the third year, we consider satellite network security mechanisms. As the satellite network is considered as a solution to the software and firmware update of the Internet of Things, we also implement the network transport layer communication security mechanism and software update mechanism in the ARM chip.
