# US 12,225,453 B2 · Serving cell rat acquisition and indication methods and apparatuses, and devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,453 B2 - Document ID: US12225453B2 - Status: Granted - Kind: B2 - Application number: 17/793,821 - Filed: 2021-03-18 - Published: 2023-02-16 - Granted: 2025-02-11 - Earliest claimed: 2020-01-19 - Assignees: Spreadtrum Communications (Shanghai) Co., Ltd. - Applicants: Spreadtrum Communications (Shanghai) Co., Ltd. - Inventors: Xing Liu - Web page: https://patentgrep.com/patent/US12225453B2 ## CPC - H04W 48/16: Discovering, processing access restriction or access information - H04W 88/04: adapted for relaying to or from another terminal or user - H04W 8/08: Mobility data transfer - H04W 48/12: using downlink control channel - H04W 76/20: Manipulation of established connections - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 48/18: Selecting a network or a communication service - H04W 76/15: Setup of multiple wireless link connections - H04W 76/23: Manipulation of direct-mode connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method and apparatus for acquiring a Radio Access Technology (RAT) of a serving cell, a method and apparatus for indicating a RAT of a serving cell, and devices are provided. The method for acquiring a RAT of a serving cell includes: receiving RAT indication information from the relay device, wherein the RAT indication information indicates RAT information of the serving cell where the relay device is located; determining, based on the RAT indication information, a RAT type adopted by a base station to which the serving cell belongs; and communicating with the base station using the RAT appropriate to the RAT type adopted by the base station. ## Claims ### Claim 1 A method for acquiring a Radio Access Technology (RAT) of a serving cell where a relay device is located, comprising: receiving RAT indication information from the relay device, wherein the RAT indication information indicates RAT information of the serving cell where the relay device is located; determining, based on the RAT indication information, a RAT type adopted by a base station to which the serving cell belongs; and communicating with the base station using the RAT appropriate to the RAT type adopted by the base station; wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs: comparing system information of the base station with various types of preset standard system information to obtain a comparison result, and determining the RAT type of the serving cell based on the comparison result; and determining the RAT type adopted by the base station based on the RAT type of the serving cell. ### Claim 2 (depends on 1) The method according to claim 1, wherein the RAT indication information is included in any of following information: direct link system information, discovery message, and Sidelink Radio Resource Control (SL-RRC) signaling, wherein the direct link system information comprises Sidelink Master Information Block (SL-MIB) or Sidelink System Information Block (SL-SIB). ### Claim 3 (depends on 1) The method according to claim 1, wherein the RAT indication information is included in the system information of the base station. ### Claim 4 (depends on 3) The method according to claim 3, wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs further comprises: determining, based on content of the system information of the base station, the RAT type adopted by the base station to which the serving cell belongs. ### Claim 5 (depends on 1) The method according to claim 1, wherein said comparing the system information of the base station with various types of preset standard system information to obtain the comparison result, and determining the RAT type of the serving cell based on the comparison result comprises any of following: the various types of standard system information comprising standard Long Term Evolution (LTE) MIB and standard New Radio (NR) MIB, the system information of the base station being encapsulated as MIB, comparing the MIB of the base station with the standard LTE MIB and the standard NR MIB, respectively, determining that the serving cell is an LTE cell based on a size of the MIB of the base station being the same as that of the standard LTE MIB, and determining that the serving cell is an NR cell based on the size of the MIB of the base station being the same as that of the standard NR MIB; or the various types of standard system information comprising standard LTE SIB and standard NR SIB, the system information of the base station being encapsulated as SIB, comparing the SIB of the base station with the standard LTE SIB and the standard NR SIB, respectively, determining that the serving cell is an LTE cell based on a size of the SIB of the base station being the same as that of the standard LTE SIB, and determining that the serving cell is an NR cell based on the size of the SIB of the base station being the same as that of the standard NR SIB. ### Claim 6 A method for indicating a Radio Access Technology (RAT) of a serving cell where a relay device is located, comprising: acquiring RAT information of the serving cell where the relay device is located; and sending RAT indication information which indicates the RAT information of the serving cell, so that a User Equipment (UE) determines, based on the RAT indication information, a RAT type adopted by a base station to which the serving cell belongs, and communicates with the base station using the RAT appropriate to the RAT type adopted by the base station; wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs: comparing system information of the base station with various types of preset standard system information to obtain a comparison result, and determining the RAT type of the serving cell based on the comparison result; and determining the RAT type adopted by the base station based on the RAT type of the serving cell. ### Claim 7 (depends on 6) The method according to claim 6, wherein said sending RAT indication information comprises any of following: including the RAT indication information in direct link system information, encapsulating the direct link system information into Sidelink Master Information Block (SL-MIB) or Sidelink System Information Block (SL-SIB), and sending the SL-MIB or SL-SIB; including the RAT indication information in a discovery message, and sending the discovery message; including the RAT indication information in Sidelink Radio Resource Control (SL-RRC) signaling, and sending the SL-RCC signaling; or including the RAT indication information in system information of the base station, and sending the system information. ### Claim 8 (depends on 1) A User Equipment (UE) comprising a memory and a processor, wherein the memory stores one or more programs, the one or more programs comprising computer instructions, which, when executed by the processor, cause the processor to perform the method of claim 1. ### Claim 9 (depends on 6) A relay device comprising a memory and a processor, wherein the memory stores one or more programs, the one or more programs comprising computer instructions, which, when executed by the processor, cause the processor to perform the method of claim 6. ### Claim 10 A non-volatile or non-transitory computer-readable storage medium storing one or more programs, the one or more programs comprising computer instructions, which, when executed by a processor, cause the processor to: receive Radio Access Technology (RAT) indication information from a relay device, wherein the RAT indication information indicates RAT information of a serving cell where the relay device is located; determine, based on the RAT indication information, a RAT type adopted by a base station to which the serving cell belongs; and communicate with the base station using the RAT appropriate to the RAT type adopted by the base station; wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs: comparing system information of the base station with various types of preset standard system information to obtain a comparison result, and determining the RAT type of the serving cell based on the comparison result; and determining the RAT type adopted by the base station based on the RAT type of the serving cell. ### Claim 11 (depends on 10) The non-volatile or non-transitory computer-readable storage medium according to claim 10, wherein the RAT indication information is included in any of following information: direct link system information, discovery message, and Sidelink Radio Resource Control (SL-RRC) signaling, wherein the direct link system information comprises Sidelink Master Information Block (SL-MIB) or Sidelink System Information Block (SL-SIB). ### Claim 12 (depends on 10) The non-volatile or non-transitory computer-readable storage medium according to claim 10, wherein the RAT indication information is included in the system information of the base station. ### Claim 13 (depends on 12) The non-volatile or non-transitory computer-readable storage medium according to claim 12, wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs further comprises: determining, based on content of the system information of the base station, the RAT type adopted by the base station to which the serving cell belongs. ### Claim 14 (depends on 10) The non-volatile or non-transitory computer-readable storage medium according to claim 10, wherein said comparing the system information of the base station with various types of preset standard system information to obtain the comparison result, and determining the RAT type of the serving cell based on the comparison result comprises any of following: the various types of standard system information comprising standard Long Term Evolution (LTE) MIB and standard New Radio (NR) MIB, the system information of the base station being encapsulated as MIB, comparing the MIB of the base station with the standard LTE MIB and the standard NR MIB, respectively, determining that the serving cell is an LTE cell based on a size of the MIB of the base station being the same as that of the standard LTE MIB, and determining that the serving cell is an NR cell based on the size of the MIB of the base station being the same as that of the standard NR MIB; or the various types of standard system information comprising standard LTE SIB and standard NR SIB, the system information of the base station being encapsulated as SIB, comparing the SIB of the base station with the standard LTE SIB and the standard NR SIB, respectively, determining that the serving cell is an LTE cell based on a size of the SIB of the base station being the same as that of the standard LTE SIB, and determining that the serving cell is an NR cell based on the size of the SIB of the base station being the same as that of the standard NR SIB. ### Claim 15 A non-volatile or non-transitory computer-readable storage medium storing one or more programs, the one or more programs comprising computer instructions, which, when executed by a processor, cause the processor to: acquiring RAT information of the serving cell where the relay device is located; and sending RAT indication information which indicates the RAT information of the serving cell, so that a User Equipment (UE) determines, based on the RAT indication information, a RAT type adopted by a base station to which the serving cell belongs, and communicates with the base station using the RAT appropriate to the RAT type adopted by the base station; wherein said determining, based on the RAT indication information, the RAT type adopted by the base station to which the serving cell belongs: comparing system information of the base station with various types of preset standard system information to obtain a comparison result, and determining the RAT type of the serving cell based on the comparison result; and determining the RAT type adopted by the base station based on the RAT type of the serving cell.