# US 2020/0288390 A1 · Cell selection or access method, a user terminal, a maintenance method, and a base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0288390 A1 - Document ID: US20200288390A1 - Status: Published application - Kind: A1 - Application number: 16/648,911 - Filed: 2018-07-25 - Published: 2020-09-10 - Earliest claimed: 2017-09-26 - Assignees: Ntt Docomo, Inc. - Applicants: Ntt Docomo, Inc. - Inventors: Jing WANG; Hanning WANG; Liu LIU; Wuri A. HAPSARI - Web page: https://patentgrep.com/patent/US20200288390A1 ## CPC - H04W 48/20: Selecting an access point - H04B 7/185: Space-based or airborne stations; {Stations for satellite systems}(H04B7/204 takes precedence) - H04B 7/18506: {Communications with or from aircraft, i.e. aeronautical mobile service} - H04W 36/00835: {Determination of neighbour cell lists} - H04W 48/10: using broadcasted information - H04W 36/0083: {Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract Provided are a cell selection or access method performed by an aerial user terminal, an aerial user terminal, a neighbor relationship table maintaining method performed by a base station, and a base station. The cell selection or access method includes: receiving, from a base station, indication information for indicating support capability of at least one cell for aerial user terminals; and according to the indication information, selectively performing cell selection or access for one cell of the at least one cell. The maintaining method includes: receiving indication information indicating neighbor cells reported by a user terminal; and maintaining, according to whether the user terminal is an aerial user terminal, a neighbor relationship table selectively according to the indication information. ## Claims ### Claim 1 A method performed by an aerial user terminal, comprising: receiving, from a base station, indication information indicating support capability of at least one cell for aerial user terminals; performing cell selection or access for one of the at least one cell selectively according to the indication information. ### Claim 2 (depends on 1) The method according to claim 1, wherein the indication information is information indicating whether a cell managed by the base station supports aerial user terminals, and is included in a broadcast channel transmitted by the base station. ### Claim 3 (depends on 1) The method according to claim 1, wherein the indication information is a list indicating the at least one cell supporting aerial user terminals, and is included in system information transmitted by the base station. ### Claim 4 (depends on 2) The method according to claim 2, further comprising: receiving configuration information related to aerial user terminals from the base station through the system information. ### Claim 5 (depends on 1) The method according to claim 1, wherein the aerial user terminal is in a connected state, and the method further comprises: receiving configuration information related to aerial user terminals from the base station through radio resource control signaling. ### Claim 6 An aerial user terminal comprising: a receiving unit configured to receive, from a base station, indication information indicating support capability of at least one cell for aerial user terminals; a cell selecting/accessing unit configured to selectively perform cell selection or access for one of the at least one cell according to the indication information. ### Claim 7 (depends on 6) The aerial user terminal according to claim 6, wherein the indication information is information indicating whether a cell managed by the base station supports aerial user terminals, and is included in a broadcast channel transmitted by the base station. ### Claim 8 (depends on 6) The aerial user terminal according to claim 6, wherein the indication information is a list indicating the at least one cell supporting aerial user terminals, and is included in system information transmitted by the base station. ### Claim 9 (depends on 7) The aerial user terminal according to claim 7, wherein the receiving unit is further configured to receive configuration information related to aerial user terminals from the base station through the system information. ### Claim 10 (depends on 6) The aerial user terminal according to claim 6, wherein the aerial user terminal is in a connected state, and the receiving unit is further configured to receive configuration information related to aerial user terminals from the base station through radio resource control signaling. ### Claim at position 11 11-14. (cancelled) ### Claim 15 A base station comprising: a receiving unit configured to receive indication information indicating neighbor cells reported by a user terminal; a maintaining unit configured to selectively maintain, according to whether the user terminal is an aerial user terminal, a neighbor relationship table according to the indication information. ### Claim 16 (depends on 15) The base station according to claim 15, wherein when the user terminal is an aerial user terminal, the maintaining unit does not maintain the neighbor relationship table according to the neighbor cells indicated by the indication information. ### Claim 17 (depends on 15) The base station according to claim 15, wherein when the user terminal is an aerial user terminal, the maintaining unit maintains a neighbor relationship table dedicated to aerial user terminals, which is different from the neighbor relationship table according to the neighbor cells indicated by the indication information or neighbor cells that support aerial user terminals in the neighbor cells. ### Claim 18 (depends on 17) The base station according to claim 17, wherein when the user terminal is an aerial user terminal, the maintaining unit maintains the neighbor relationship table according to the neighbor cell indicated by the indication information or neighbor cells that support aerial user terminals in the neighbor cells, wherein in the neighbor relationship table, neighbor cells reported by aerial user terminals are distinguished from neighbor cells reported by user terminals that are not aerial user terminals.