# US 2018/0027460 A1 · Cell selection method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027460 A1 - Document ID: US20180027460A1 - Status: Published application - Kind: A1 - Application number: 15/547,301 - Filed: 2015-01-29 - Published: 2018-01-25 - Earliest claimed: 2015-01-29 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Lili ZHANG - Web page: https://patentgrep.com/patent/US20180027460A1 ## CPC - H04W 36/0085: {Hand-off measurements} - H04W 36/008357: {Determination of target cell based on access point [AP] properties, e.g. AP service capabilities} - H04W 36/20: for optimising the interference level - H04W 48/16: Discovering, processing access restriction or access information - H04W 48/20: Selecting an access point - H04W 36/00838: {Resource reservation for handover} - H04W 84/045: {using private Base Stations, e.g. femto Base Stations, home Node B} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A cell selection method and an apparatus are provided. The method includes: performing, by a terminal, cell measurement; obtaining, by the terminal, cell selection auxiliary information; and performing, by the terminal, cell selection or cell reselection according to a cell measurement result and the cell selection auxiliary information. By using the method, the terminal can select a more suitable cell. ## Claims ### Claim at position 1 1-28. (canceled) ### Claim 29 A cell selection method, comprising: performing, by a terminal, cell measurement; obtaining, by the terminal, cell selection auxiliary information; and performing, by the terminal, cell selection according to a cell measurement result and the cell selection auxiliary information. ### Claim 30 (depends on 29) The method according to claim 29, wherein the performing, by the terminal, cell selection according to a cell measurement result and the cell selection auxiliary information comprises: determining, by the terminal, a candidate target set for the cell selection according to the cell measurement result, wherein the candidate target set comprises a candidate target cell or a candidate target base station; and selecting, by the terminal, a cell from the candidate target set according to the cell selection auxiliary information. ### Claim 31 (depends on 29) The method according to claim 29, wherein the cell selection auxiliary information comprises one type or any combination of the following content: a carrier that is configured to be used to avoid interference to a neighboring cell is used as a high-priority cell selection target or a preferred resident carrier when the terminal has no cell-specific reference signal CRS interference suppression capability or interference cancellation capability; and the carrier that is configured to be used to avoid interference to a neighboring cell is used as a low-priority cell selection target or a non-preferred resident carrier when the terminal has the CRS interference suppression capability or interference cancellation capability. ### Claim 32 (depends on 31) The method according to claim 31, wherein the selecting, by the terminal, a cell from the candidate target set according to the cell selection auxiliary information comprises: using a first carrier, configured on an interfered base station, as a high-priority cell selection target or a preferred resident carrier when the terminal has no CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises multiple carriers configured on the interfered base station, the multiple carriers have a highest priority, and the first carrier in the multiple carriers is configured by an interfering base station as a carrier used to avoid interference to a neighboring cell. ### Claim 33 (depends on 31) The method according to claim 31, wherein the selecting, by the terminal, a cell from the candidate target set according to the cell selection auxiliary information comprises: using the carrier, configured by an interfered base station, as a high-priority cell selection target or a preferred resident carrier when the terminal has no CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises a carrier configured on multiple mutually interfering base stations, and the carrier is configured by one or more interfering base stations in the multiple mutually interfering base stations as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 34 (depends on 31) The method according to claim 31, wherein the selecting, by the terminal, a cell from the candidate target set according to the cell selection auxiliary information comprises: using a first carrier, configured on an interfered base station, as a low-priority cell selection target or a non-preferred resident carrier when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises multiple carriers configured on the interfered base station, the multiple carriers have a highest priority, and the first carrier in the multiple carriers is configured by an interfering base station as a carrier used to avoid interference to a neighboring cell. ### Claim 35 (depends on 31) The method according to claim 31, wherein the selecting, by the terminal, a cell from the candidate target set according to the cell selection auxiliary information comprises: using the carrier, configured by an interfered base station, as a low-priority cell selection target or a non-preferred resident carrier when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises a carrier configured on multiple mutually interfering base stations, and the carrier is configured by one or more interfering base stations in the multiple mutually interfering base stations as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 36 (depends on 29) The method according to claim 29, further comprising: using a second carrier, configured by an interfered base station, as a high-priority cell selection target or a preferred resident carrier, wherein the second carrier is one of the N carriers, and a quantity of interfering base stations that configure the second carrier as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations is greater than a quantity of interfering base stations that configure another carrier in the N carriers as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 37 (depends on 29) The method according to claim 29, further comprising: using a second carrier, configured by an interfered base station, as a low-priority cell selection target or a non-preferred resident carrier, wherein the second carrier is one of the N carriers, and a quantity of interfering base stations that configure the second carrier as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations is greater than a quantity of interfering base stations that configure another carrier in the N carriers as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises N carriers configured on multiple mutually interfering base stations, N is an integer greater than 1, and the N carriers are configured by one or more interfering base stations in the multiple mutually interfering base stations as carriers used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 38 (depends on 29) The method according to claim 29, wherein the cell selection auxiliary information comprises one type or a combination of the following information: carrier configuration characteristic information; a carrier with a specified characteristic; and resident carrier preference information of the terminal. ### Claim 39 (depends on 38) The method according to claim 38, wherein the resident carrier preference information of the terminal comprises: an identifier of a carrier that is configured to be used to avoid interference to a neighboring cell and a list of a first terminal type and a list of a second terminal type that is corresponding to the identifier of the carrier, wherein a terminal indicated by the first terminal type has no CRS interference suppression capability or interference cancellation capability, and uses a carrier that is configured to be used to avoid interference to a neighboring cell as a high-priority cell selection target; and a terminal indicated by the second terminal type has the CRS interference suppression capability or interference cancellation capability, and uses a carrier that is configured to be used to avoid interference to a neighboring cell as a low-priority cell selection target. ### Claim 40 A terminal, comprising a processor, a memory, a transceiver, and a bus interface, wherein the processor, the memory, and the transceiver are connected by using the bus interface, the memory stores data used when the processor performs an operation, the transceiver is configured to receive and transmit data under control of the processor, and the processor is configured to read a program in the memory, to execute the following process: performing cell measurement; obtaining cell selection auxiliary information; and performing cell selection according to a cell measurement result and the cell selection auxiliary information. ### Claim 41 (depends on 40) The terminal according to claim 40, wherein the processor is specifically configured to: determine a candidate target set for the cell selection according to the cell measurement result, wherein the candidate target set comprises a candidate target cell or a candidate target base station; and select a cell from the candidate target set according to the cell selection auxiliary information. ### Claim 42 (depends on 40) The terminal according to claim 40, wherein the cell selection auxiliary information comprises one type or any combination of the following content: a carrier that is configured to be used to avoid interference to a neighboring cell is used as a high-priority cell selection target or a preferred resident carrier when the terminal has no cell-specific reference signal CRS interference suppression capability or interference cancellation capability; and the carrier that is configured to be used to avoid interference to a neighboring cell is used as a low-priority cell selection target or a non-preferred resident carrier when the terminal has one of the CRS interference suppression capability and interference cancellation capability. ### Claim 43 (depends on 42) The terminal according to claim 42, wherein the processor is configured to: use the first carrier, configured on the interfered base station, as a high-priority cell selection target or a preferred resident carrier when the terminal has no CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises multiple carriers configured on an interfered base station, the multiple carriers have a highest priority, and a first carrier in the multiple carriers is configured by an interfering base station as a carrier used to avoid interference to a neighboring cell. ### Claim 44 (depends on 42) The terminal according to claim 42, wherein the processor is configured to: use the carrier, configured by the interfered base station, as a high-priority cell selection or target or a preferred resident carrier when the terminal has no CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises a carrier configured on multiple mutually interfering base stations, and the carrier is configured by one or more interfering base stations in the multiple mutually interfering base stations as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 45 (depends on 42) The terminal according to claim 42, wherein the processor is configured to: use the first carrier, configured on the interfered base station, as a low-priority cell selection target or a non-preferred resident carrier when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises multiple carriers configured on an interfered base station, the multiple carriers have a highest priority, and a first carrier in the multiple carriers is configured by an interfering base station as a carrier used to avoid interference to a neighboring cell. ### Claim 46 (depends on 42) The terminal according to claim 42, wherein the processor is configured to: use the carrier, configured by the interfered base station, as a low-priority cell selection target or a non-preferred resident carrier when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises a carrier configured on multiple mutually interfering base stations, and the carrier is configured by one or more interfering base stations in the multiple mutually interfering base stations as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 47 (depends on 40) The terminal according to claim 40, wherein the processor is further configured to: use a second carrier, configured by the interfered base station, as a high-priority cell selection target or a preferred resident carrier, wherein the second carrier is one of the N carriers, and a quantity of interfering base stations that configure the second carrier as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations is greater than a quantity of interfering base stations that configure another carrier in the N carriers as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations when the terminal has no CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises N carriers configured on multiple mutually interfering base stations, N is an integer greater than 1, and the N carriers are configured by one or more interfering base stations in the multiple mutually interfering base stations as carriers used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations. ### Claim 48 (depends on 40) The terminal according to claim 40, wherein the processor is further configured to: use a second carrier, configured by the interfered base station, as a low-priority cell selection target or a non-preferred resident carrier, wherein the second carrier is one of the N carriers, and a quantity of interfering base stations that configure the second carrier as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations is greater than a quantity of interfering base stations that configure another carrier in the N carriers as a carrier used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations when the terminal has the CRS interference suppression capability or interference cancellation capability, the candidate target set determined by the terminal comprises N carriers configured on multiple mutually interfering base stations, N is an integer greater than 1, and the N carriers are configured by one or more interfering base stations in the multiple mutually interfering base stations as carriers used to avoid interference to one or more interfered neighboring cells of the multiple mutually interfering base stations.