# US 12,120,565 B2 · Base station apparatus, terminal apparatus, control method, and computer-readable storage medium for efficient tracking > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,565 B2 - Document ID: US12120565B2 - Status: Granted - Kind: B2 - Application number: 18/169,997 - Filed: 2023-02-16 - Published: 2023-06-22 - Granted: 2024-10-15 - Earliest claimed: 2021-01-06 - Assignees: Kddi Corporation - Applicants: Kddi Corporation - Inventors: Hiroki Takeda; Yanwei Li - Web page: https://patentgrep.com/patent/US12120565B2 ## CPC - H04W 36/00835: {Determination of neighbour cell lists} - H04W 36/008357: {Determination of target cell based on access point [AP] properties, e.g. AP service capabilities} - H04W 24/02: Arrangements for optimising operational condition - H04W 36/0061: {of neighbour cell information} - H04W 36/32: by location or mobility data, e.g. speed data - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/20: Selecting an access point - H04W 36/13: {Cell handover without a predetermined boundary, e.g. virtual cells} - H04W 60/002: {Registration for requesting network slices} - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Abase station apparatus acquires, for a cell formed by the base station apparatus, a list of area identifiers belonging to a tracking area the same as that of the cell and information of an area identifier of a neighbor cell adjacent to the cell, determines whether or not the area identifier of the neighbor cell is included in the list, and notifies a terminal apparatus of information in which information of the neighbor cell and a result of the determining are associated together. ## Claims ### Claim 1 A base station apparatus, comprising: one or more processors; and one or more memories that store a computer-readable instruction for causing, when executed by the one or more processors, the one or more processors to function as: an acquiring unit configured to acquire information of a tracking area identifier (TAI) of a neighbor cell adjacent to a cell formed by the base station apparatus and a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which the cell formed by the base station apparatus belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; a providing unit configured to provide, when performing registration of a position of a terminal apparatus, the terminal apparatus with TAIs belonging to the TAI list; and a transmission unit configured to transmit, after providing the TAIs belonging to the TAI list to the terminal apparatus, a broadcast signal including the TAI of the neighbor cell and a cell identifier of the neighbor cell. ### Claim 2 (depends on 1) The base station apparatus according to claim 1, wherein the broadcast signal includes information indicating a frequency used in the neighbor cell. ### Claim 3 (depends on 1) The base station apparatus according to claim 1, wherein the acquiring unit acquires the information of the TAI of the neighbor cell from another base station apparatus forming the neighbor cell. ### Claim 4 (depends on 3) The base station apparatus according to claim 3, wherein the acquiring unit acquires the TAI of the neighbor cell via an XN SETUP REQUEST message, an XN SETUP RESPONSE message, an NG-RAN NODE CONFIGURATION UPDATE message, or an NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE message. ### Claim 5 (depends on 1) The base station apparatus according to claim 1, wherein the broadcast signal is System Information Block (SIB). ### Claim 6 A terminal apparatus, comprising: one or more processors; and one or more memories that store a computer-readable instruction for causing, when executed by the one or more processors, the one or more processors to function as: an acquisition unit configured to acquire, when performing registration of a position of the terminal apparatus, tracking area identifiers (TAIs) belonging to a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which a residing cell where the terminal apparatus is in standby belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; a receiving unit configured to receive, after acquisition of the TAIs belonging to the TAI list from a base station apparatus forming the residing cell, a broadcast signal including a TAI of a neighbor cell adjacent to the residing cell and a cell identifier of the neighbor cell; a determining unit configured to determine whether or not the TAI of the neighbor cell is included in the acquired TAIs belonging to the TAI list; and a setting unit configured to set a priority for selecting the neighbor cell on a basis of a result of the determining. ### Claim 7 A terminal apparatus, comprising: one or more processors; and one or more memories that store a computer-readable instruction for causing, when executed by the one or more processors, the one or more processors to function as: an acquisition unit configured to acquire, when performing registration of a position of the terminal apparatus, tracking area identifiers (TAIs) belonging to a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which a residing cell where the terminal apparatus is in standby belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; a receiving unit configured to receive, after acquisition of the TAIs belonging to the TAI list from a base station apparatus forming the residing cell, a broadcast signal including a TAI of a neighbor cell adjacent to the residing cell and a cell identifier of the neighbor cell; a first determining unit configured to determine whether or not the TAI of the neighbor cell is included in the acquired TAIs belonging to the TAI list; a second determining unit configured to determine, on a basis of a result of the determining of the first determining unit, whether a predetermined network slice can be provided in the neighbor cell; and a setting unit configured to set, on a basis of a result of the determining of the second determining unit, a priority for selection of the neighbor cell. ### Claim 8 (depends on 6) The terminal apparatus according to claim 6, wherein the broadcast signal includes information indicating a frequency used in the neighbor cell. ### Claim 9 (depends on 6) The terminal apparatus according to claim 6, wherein the broadcast signal is System Information Block (SIB). ### Claim 10 (depends on 6) The terminal apparatus according to claim 6, wherein the setting unit sets a priority for when the TAI of the neighbor cell is included in the list higher than a priority for when the TAI of the neighbor cell is not included in the list. ### Claim 11 (depends on 6) The terminal apparatus according to claim 6, wherein on a basis of a set priority, the setting unit sets a condition relating to starting a search for a cell corresponding to the priority or a condition relating to movement to a cell corresponding to the priority. ### Claim 12 A control method executed by a base station apparatus, comprising: acquiring information of a tracking area identifier (TAI) of a neighbor cell adjacent to a cell formed by the base station apparatus and a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which the cell formed by the base station apparatus belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; providing, when performing registration of a position of a terminal apparatus, the terminal apparatus with TAIs belonging to the TAI list; and transmitting, after providing the TAIs belonging to the TAI list to the terminal apparatus, a broadcast signal including the TAI of the neighbor cell and cell identifier of the neighbor cell. ### Claim 13 A control method executed by a terminal apparatus, comprising: acquiring, when performing registration of a position of the terminal apparatus, tracking area identifiers (TAIs) belonging to a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which a residing cell where the terminal apparatus is in standby belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; receiving, after acquisition of the TAIs belonging to the TAI list from a base station apparatus forming the residing cell, a broadcast signal including a TAI of a neighbor cell adjacent to the residing cell and a cell identifier of the neighbor cell; determining whether or not the TAI of the neighbor cell is included in the acquired TAIs belonging to the TAI list; and setting a priority for selecting the neighbor cell on a basis of a result of the determining. ### Claim 14 A non-transitory computer-readable storage medium that stores a program for causing a computer included in a base station apparatus to: acquire information of a tracking area identifier (TAI) of a neighbor cell adjacent to a cell formed by the base station apparatus and a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which the cell formed by the base station apparatus belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; provide, when performing registration of a position of a terminal apparatus, the terminal apparatus with TAIs belonging to the TAI list; and transmit, after providing the TAI belonging to the TAI list to the terminal apparatus, a broadcast signal including the TAI of the neighbor cell and a cell identifier of the neighbor cell. ### Claim 15 A non-transitory computer-readable storage medium that stores a program for causing a computer included in a terminal apparatus to: acquire, when performing registration of a position of the terminal apparatus, tracking area identifiers (TAIs) belonging to a TAI list that comprises a plurality of TAIs belonging to a same tracking area to which a residing cell where the terminal apparatus is in standby belongs, wherein the plurality of TAIs indicate tracking areas that can provide an identical network slice; receive, after acquisition of the TAIs belonging to the TAI list from a base station apparatus forming the residing cell, a broadcast signal including a TAI of a neighbor cell adjacent to the residing cell and a cell identifier of the neighbor cell; perform determination of whether or not the TAI of the neighbor cell is included in the acquired TAIs belonging to the TAI list; and set a priority for selecting the neighbor cell on a basis of a result of the determination.