# US 12,184,395 B2 · Satellite communication system and method for managing radio resource of non-terrestrial network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,395 B2 - Document ID: US12184395B2 - Status: Granted - Kind: B2 - Application number: 17/562,030 - Filed: 2021-12-27 - Published: 2023-06-01 - Granted: 2024-12-31 - Earliest claimed: 2021-11-30 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: Shao-Yu Lien; Bai-Chuan Chang; Ching-Chun Chou; Hua-Lung Tsai - Web page: https://patentgrep.com/patent/US12184395B2 ## CPC - H04B 7/1851: {Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576)} - H04B 7/18521: {Systems of inter linked satellites, i.e. inter satellite service (for optical links between satellites H04B10/118)} - H04B 7/18539: {Arrangements for managing radio, resources, i.e. for establishing or releasing a connection} - H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows - H04W 72/56: based on priority criteria - H04W 84/06: Airborne or Satellite Networks (space-based or airborne stations H04B7/185) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A satellite communication system and a method for managing radio resource of a non-terrestrial network are provided. The method includes: transmitting, by a first satellite, a first resource scheduling assignment when leaving a service area of the non-terrestrial network; receiving, by a second satellite, a second resource scheduling assignment corresponding to the first scheduling assignment when entering the service area; and accessing, by the second satellite, the radio resource according to the second resource scheduling assignment. ## Claims ### Claim 1 A method for managing radio resources of a non-terrestrial network, adaptable for satellites, wherein the method comprises: receiving a first resource scheduling assignment from a second satellite in response to entering a service area of the non-terrestrial network; and accessing the radio resources according to the first resource scheduling assignment. ### Claim 2 (depends on 1) The method according to claim 1, wherein the step of receiving the first resource scheduling assignment from the second satellite in response to entering the service area of the non-terrestrial network comprises: receiving the first resource scheduling assignment from the second satellite through a ground station. ### Claim 3 (depends on 1) The method according to claim 1, wherein the step of receiving the first resource scheduling assignment from the second satellite in response to entering the service area of the non-terrestrial network comprises: detecting whether an inter-satellite link (ISL) is present; and receiving the first resource scheduling assignment directly from the second satellite in response to a presence of the ISL. ### Claim 4 (depends on 2) The method according to claim 2, wherein the step of receiving the first resource scheduling assignment from the second satellite in response to entering the service area of the non-terrestrial network further comprises: detecting whether an ISL is present; and receiving the first resource scheduling assignment through the ground station in response to an absence of the ISL. ### Claim 5 (depends on 1) The method according to claim 1, further comprising: transmitting a second resource scheduling assignment to a third satellite in response to leaving the service area. ### Claim 6 (depends on 5) The method according to claim 5, further comprising: determining the second resource scheduling assignment according to the first resource scheduling assignment. ### Claim 7 (depends on 5) The method according to claim 5, wherein the step of transmitting the second resource scheduling assignment to the third satellite in response to leaving the service area comprises: detecting whether an ISL is present; and transmitting the second resource scheduling assignment directly to the third satellite in response to a presence of the ISL. ### Claim 8 (depends on 7) The method according to claim 7, wherein the step of transmitting the second resource scheduling assignment to the third satellite in response to leaving the service area further comprises: transmitting the second resource scheduling assignment to the third satellite through a ground station in response to an absence of the ISL. ### Claim 9 (depends on 1) The method according to claim 1, wherein the step of accessing the radio resources according to the first resource scheduling assignment comprises: determining a first priority of the first resource scheduling assignment and at least one priority of at least one resource scheduling assignment; and selecting the first resource scheduling assignment to access the radio resources in response to the first priority being higher than the at least one priority. ### Claim 10 (depends on 9) The method according to claim 9, wherein the first priority is associated with at least one of the following: satellite specifications, measurement results of service quality, radio resource scheduling in a time domain, radio resource scheduling in a frequency domain, or radio resource scheduling in a space domain. ### Claim 11 (depends on 9) The method according to claim 9, further comprising: measuring network parameters corresponding to the service area; and generating the at least one resource scheduling assignment according to the network parameters. ### Claim 12 (depends on 1) The method according to claim 1, wherein the first resource scheduling assignment comprises at least one of the following: radio resource scheduling, traffic scheduling, or service resource control. ### Claim 13 A method for managing radio resources of a non-terrestrial network, adaptable for a ground station, wherein the method comprises: receiving a first resource scheduling assignment from a first satellite which leaves a service area of the non-terrestrial network; and transmitting a second resource scheduling assignment to a second satellite which enters the service area according to the first resource scheduling assignment. ### Claim 14 (depends on 13) The method according to claim 13, wherein the second resource scheduling assignment is the same as the first resource scheduling assignment, and the step of transmitting the second resource scheduling assignment to the second satellite which enters the service area according to the first resource scheduling assignment comprises: determining a first priority of the second resource scheduling assignment and at least one priority of at least one resource scheduling assignment; and selecting to transmit the second resource scheduling assignment to the second satellite in response to the first priority being higher than the at least one priority. ### Claim 15 (depends on 13) The method according to claim 13, wherein the second resource scheduling assignment is different from the first resource scheduling assignment, and the step of transmitting the second resource scheduling assignment to the second satellite which enters the service area according to the first resource scheduling assignment comprises: determining a first priority of the second resource scheduling assignment and at least one priority of the at least one resource scheduling assignment, wherein the at least one resource scheduling assignment comprises the first resource scheduling assignment; and selecting to transmit the second resource scheduling assignment to the second satellite in response to the first priority being higher than the at least one priority. ### Claim 16 (depends on 14) The method according to claim 14, wherein the first priority is associated with at least one of the following: satellite specifications, measurement results of service quality, radio resource scheduling in a time domain, radio resource scheduling in a frequency domain, or radio resource scheduling in a space domain. ### Claim 17 (depends on 14) The method according to claim 14, further comprising: measuring network parameters corresponding to the service area; and generating the at least one resource scheduling assignment according to the network parameters. ### Claim 18 (depends on 13) The method according to claim 13, wherein the second resource scheduling assignment comprises at least one of the following: radio resource scheduling, traffic scheduling, or service resource control. ### Claim 19 A method for managing radio resources of a non-terrestrial network, adaptable for a satellite communication system, wherein the satellite communication system comprises a first satellite and a second satellite, and the method comprises: transmitting a first resource scheduling assignment by the first satellite when leaving a service area of the non-terrestrial network; receiving a second resource scheduling assignment corresponding to the first resource scheduling assignment when the second satellite enters the service area; and accessing the radio resources by the second satellite according to the second resource scheduling assignment. ### Claim 20 (depends on 19) The method according to claim 19, wherein the step of receiving the second resource scheduling assignment corresponding to the first resource scheduling assignment by the second satellite when entering the service area comprises: detecting whether an ISL is present by the second satellite; and receiving the second resource scheduling assignment directly from the first satellite by the second satellite in response to a presence of the ISL, wherein the second resource scheduling assignment is the same as the first resource scheduling assignment. ### Claim 21 (depends on 20) The method according to claim 20, wherein the step of receiving the second resource scheduling assignment corresponding to the first resource scheduling assignment by the second satellite when entering the service area further comprises: receiving the second resource scheduling assignment from a ground station by the second satellite in response to an absence of the ISL. ### Claim 22 (depends on 19) The method according to claim 19, wherein the step of accessing the radio resources by the second satellite according to the second resource scheduling assignment comprises: determining, by the second satellite, a first priority of the second resource scheduling assignment and at least one priority of at least one resource scheduling assignment; and selecting, by the second satellite, the second resource scheduling assignment to access the radio resources in response to the first priority being higher than the at least one priority. ### Claim 23 (depends on 22) The method according to claim 22, wherein the first priority is associated with at least one of the following: satellite specifications, measurement results of service quality, radio resource scheduling in a time domain, radio resource scheduling in a frequency domain, or radio resource scheduling in a space domain. ### Claim 24 (depends on 22) The method according to claim 22, further comprising: measuring network parameters of the service area by the second satellite; and generating the at least one resource scheduling assignment by the second satellite according to the network parameters. ### Claim 25 (depends on 19) The method according to claim 19, further comprising: receiving the first resource scheduling assignment from the first satellite by a ground station; and transmitting the second resource scheduling assignment to the second satellite by the ground station in response to receiving the first resource scheduling assignment. ### Claim 26 (depends on 25) The method according to claim 25, wherein the second resource scheduling assignment is the same as the first resource scheduling assignment, and the step of transmitting the second resource scheduling assignment to the second satellite by the ground station in response to receiving the first resource scheduling assignment comprises: determining, by the ground station, a first priority of the second resource scheduling assignment and at least one priority of at least one resource scheduling assignment; and selecting, by the ground station, to transmit the second resource scheduling assignment to the second satellite in response to the first priority being higher than the at least one priority. ### Claim 27 (depends on 25) The method according to claim 25, wherein the second resource scheduling assignment is different from the first resource scheduling assignment, and the step of transmitting, by the ground station, the second resource scheduling assignment to the second satellite in response to receiving the first resource scheduling assignment comprises: determining, by the ground station, a first priority of the second resource scheduling assignment and at least one priority of at least one resource scheduling assignment, wherein the at least one resource scheduling assignment comprises the first resource scheduling assignment; and selecting, by the ground station, to transmit the second resource scheduling assignment to the second satellite in response to the first priority being higher than the at least one priority. ### Claim 28 (depends on 26) The method according to claim 26, further comprising: measuring network parameters of the service area by the ground station; and generating the at least one resource scheduling assignment by the ground station according to the network parameters. ### Claim 29 (depends on 19) The method according to claim 19, wherein the second resource scheduling assignment comprises at least one of the following: radio resource scheduling, traffic scheduling, or service resource control. ### Claim 30 A satellite for managing radio resources of a non-terrestrial network, comprising: a transceiver; and a processor, coupled to the transceiver, wherein the processor is configured to: receive a first resource scheduling assignment from a second satellite through the transceiver in response to entering a service area of the non-terrestrial network; and access the radio resources through the transceiver according to the first resource scheduling assignment. ### Claim 31 A ground station for managing radio resources of a non-terrestrial network, comprising: a transceiver; and a processor, coupled to the transceiver, wherein the processor is configured to: receive, through the transceiver, a first resource scheduling assignment from a first satellite which leaves a service area of the non-terrestrial network; and transmit, through the transceiver, a second resource scheduling assignment to a second satellite which enters the service area according to the first resource scheduling assignment. ### Claim 32 A satellite communication system for managing radio resources of a non-terrestrial network, comprising: a first satellite, transmitting a first resource scheduling assignment when leaving a service area of the non-terrestrial network; and a second satellite, communicatively connected to the first satellite, wherein the second satellite receives a second resource scheduling assignment corresponding to the first resource scheduling assignment when entering the service area, and accesses the radio resources according to the second resource scheduling assignment.