# US 2021/0345295 A1 · Ran paging and ran area identifier exchange between base stations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345295 A1 - Document ID: US20210345295A1 - Status: Published application - Kind: A1 - Application number: 17/371,588 - Filed: 2021-07-09 - Published: 2021-11-04 - Earliest claimed: 2017-03-17 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Kyungmin Park; Esmael Hejazi Dinan - Web page: https://patentgrep.com/patent/US20210345295A1 ## CPC - H04W 68/025: {Indirect paging} - H04W 8/24: Transfer of terminal data - H04W 68/04: multi-step notification using statistical or historical mobility data - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 76/11: Allocation or use of connection identifiers - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A first base station receives from a second base station: a cell identifier of a cell of the second base station; and a second radio access network (RAN) area identifier of the cell. A packet for a wireless device in a radio resource control (RRC) inactive state is received. A RAN paging message is sent to the second base station in response to receiving the packet. The RAN paging message is based on a first RAN area identifier of the first base station being identical to the second RAN area identifier. ## Claims ### Claim 1 A method by a first base station comprising: receiving, from a second base station, cell related information including one or more second cell identifiers of one or more cells supported by the second base station; identifying a packet for a wireless device in a radio resource control (RRC) inactive state supporting a radio access network (RAN) paging; and transmitting, to the second base station, in response to identifying the packet, a RAN paging message based on a first RAN area identifier of one or more cells supported by the first base station and a second RAN area identifier of the one or more cells supported by the second base station. ### Claim 2 (depends on 1) The method of claim 1, wherein the RAN paging message comprises an identifier of the wireless device for the RAN paging, paging discontinuous reception (DRX) information and RAN paging area information of a RAN paging area for the RAN paging. ### Claim 3 (depends on 2) The method of claim 2, wherein the RAN paging area information comprises the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station. ### Claim 4 (depends on 1) The method of claim 1, wherein the second RAN area identifier is included in the cell related information. ### Claim 5 (depends on 1) The method of claim 1, further comprising transmitting, to the second base station, at least one of: one or more first cell identifiers of the one or more cells supported by the first base station; or the first RAN area identifier. ### Claim 6 (depends on 1) The method of claim 1, further comprising: transmitting, to the wireless device, at least one RRC release message comprising the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station, wherein the at least one RRC release message indicates a state transition of the wireless device to the RRC inactive state. ### Claim 7 (depends on 1) The method of claim 1, wherein the transmitting the RAN paging message is further based on the wireless device being in the RRC inactive state. ### Claim 8 A method by a second base station comprising: transmitting, to a first base station, cell related information including one or more second cell identifiers of one or more cells supported by the second base station; and receiving, from the first base station, a radio access network (RAN) paging message for a wireless device based on a first RAN area identifier of one or more cells supported by the first base station and a second RAN area identifier of the one or more cells supported by the second base station, wherein the wireless device is in a radio resource control (RRC) inactive state supporting a RAN paging. ### Claim 9 (depends on 8) The method of claim 8, wherein the RAN paging message indicates a state transition of the wireless device from the RRC inactivate state to at least one of: an RRC idle state; or an RRC connected state. ### Claim 10 (depends on 8) The method of claim 8, further comprising transmitting, to the wireless device, one or more paging messages based on the RAN paging message. ### Claim 11 (depends on 8) The method of claim 8, wherein the RAN paging message comprises an identifier of the wireless device for the RAN paging, paging discontinuous reception (DRX) information and RAN paging area information of a RAN paging area for the RAN paging. ### Claim 12 (depends on 11) The method of claim 11, wherein the RAN paging area information comprises the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station. ### Claim 13 (depends on 8) The method of claim 8, wherein the second RAN area identifier is included in the cell related information. ### Claim 14 (depends on 8) The method of claim 8, further comprising: receiving, by the second base station from the first base station, at least one of: one or more first cell identifiers of the one or more cells supported by the first base station; or the first RAN area identifier. ### Claim 15 (depends on 8) The method of claim 8, wherein the wireless device is in the RRC inactive state based on the wireless device receiving at least one RRC release message that indicates a state transition of the wireless device to the RRC inactive state, and wherein the at least one RRC release message comprises the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station. ### Claim 16 (depends on 8) The method of claim 8, wherein the receiving the RAN paging message is further based on the wireless device being in the RRC inactive state. ### Claim 17 An apparatus by a first base station in a communication, the apparatus comprising: a transceiver configured to transmit and receive data; and at least one processor configured to: control to the transceiver to receive, from a second base station, cell related information including one or more second cell identifiers of one or more cells supported by the second base station, identify a packet for a wireless device in a radio resource control (RRC) inactive state supporting a radio access network (RAN) paging, and control to the transceiver to transmit, to the second base station, in response to identifying the packet, a RAN paging message based on a first RAN area identifier of one or more cells supported by the first base station and a second RAN area identifier of the one or more cells supported by the second base station. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the RAN paging message comprises an identifier of the wireless device for the RAN paging, paging discontinuous reception (DRX) information and RAN paging area information of a RAN paging area for the RAN paging, wherein the RAN paging area information comprises the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station, and wherein the second RAN area identifier is included in the cell related information. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the at least one processor is further configured to: control to the transceiver to transmit, to the second base station, at least one of: one or more first cell identifiers of the one or more cells supported by the first base station, or the first RAN area identifier. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the at least one processor is further configured to: control to the transceiver to transmit, to the wireless device, at least one RRC release message comprising the first RAN area identifier, the second RAN area identifier, the one or more second cell identifiers, and one or more first cell identifiers of the one or more cells supported by the first base station, wherein the at least one RRC release message indicates a state transition of the wireless device to the RRC inactive state, and wherein the transmitting the RAN paging message is further based on the wireless device being in the RRC inactive state.