# US 10,455,562 B2 · Method for acquiring system frame number by terminal, terminal, and mobile communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,562 B2 - Document ID: US10455562B2 - Status: Granted - Kind: B2 - Application number: 16/422,314 - Filed: 2019-05-24 - Published: 2019-09-12 - Granted: 2019-10-22 - Earliest claimed: 2013-11-01 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Sangbum Kim; Soenghun Kim; Kyeongin Jeong; Gert Jan Van Lieshout; Himke Van Der Velde - Web page: https://patentgrep.com/patent/US10455562B2 ## CPC - H04W 72/0413 - H04L 5/0058: {Allocation criteria} - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 4/08: User group management - H04W 16/32: Hierarchical cell structures - H04W 36/0069: {in case of dual connectivity, e.g. decoupled uplink/downlink} - H04W 36/0088: {Scheduling hand-off measurements} - H04W 48/02: Access restriction performed under specific conditions - H04W 48/20: Selecting an access point - H04W 56/001: {Synchronization between nodes} - H04W 72/042 - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W 84/045: {using private Base Stations, e.g. femto Base Stations, home Node B} - H04W 88/12: Access point controller devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A System Frame Number (SFN) acquisition method is provided. The System Frame Number (SFN) acquisition method of a terminal according to the present invention includes receiving a first message for adding a secondary cell of a secondary base station from a primary cell of a primary base station, receiving a Master Information Block (MIB) broadcast in the secondary cell, and acquiring a SFN information for the secondary cell from the MIB, and applying the SFN information to at least one cell of the secondary base station. ## Claims ### Claim 1 A method by a terminal in a wireless communication system, the method comprising: receiving, from a first base station, a radio resource control (RRC) message for adding at least one secondary cell of a second base station; receiving, on a primary secondary cell (PSCell) of the second base station, master information block (MIB) or physical broadcast channel (PBCH); identifying a system frame number (SFN) based on the MIB or the PBCH; and applying the identified SFN to communicate with the at least one secondary cell of the second base station, wherein the RRC message includes information for the at least one secondary cell except for the SFN, and wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource. ### Claim 2 (depends on 1) The method of claim 1, wherein a master cell group (MCG) is controlled by the first base station, and wherein a secondary cell group (SCG) is controlled by the second base station. ### Claim 3 (depends on 1) The method of claim 1, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station. ### Claim 4 A method by a second base station in a wireless communication system, the method comprising: determining to add at least one secondary cell including a primary secondary cell (PSCell) having a physical uplink control channel (PUCCH) resource, of the second base station; and transmitting, on the PSCell to a terminal, master information block (MIB) or physical broadcast channel (PBCH), the MIB or the PBCH includes a system frame number (SFN) which is applied to communicate with the at least one secondary cell of the second base station, wherein a radio resource control (RRC) message which is transmitted from a first base station to the terminal for adding the at least one secondary cell to the terminal includes information for the at least one secondary cell except for the SFN. ### Claim 5 (depends on 4) The method of claim 4, wherein a secondary cell group (SCG) is controlled by the second base station, and wherein a master cell group (MCG) is controlled by the first base station. ### Claim 6 (depends on 4) The method of claim 4, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station. ### Claim 7 A method by a first base station in a wireless communication system, the method comprising: determining to add at least one secondary cell of a second base station to a terminal; and transmitting, to the terminal, a radio resource control (RRC) message for adding the at least one secondary cell of the second base station, wherein the RRC message includes information for the at least one secondary cell except for a system frame number (SFN), wherein the SFN which is applied to the at least one secondary cell of the second base station is transmitted to the terminal on master information block (MIB) or physical broadcast channel (PBCH) of a primary secondary cell (PSCell) of the second base station, and wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource. ### Claim 8 (depends on 7) The method of claim 7, wherein a master cell group (MCG) is controlled by the first base station, and wherein a secondary cell group (SCG) is controlled by the second base station. ### Claim 9 (depends on 7) The method of claim 7, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station. ### Claim 10 A terminal in a wireless communication system, the terminal comprising: a transceiver; and a controller coupled with the transceiver and configured to control to: receive, from a first base station, a radio resource control (RRC) message for adding at least one secondary cell of a second base station, receive, on a primary secondary cell (PSCell) of the second base station, master information block (MIB) or physical broadcast channel (PBCH), identify a system frame number (SFN) based on the MIB or the PBCH, and apply the identified SFN to communicate with the at least one secondary cell of the second base station, wherein the RRC message includes information for the at least one secondary cell except for the SFN, and wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource. ### Claim 11 (depends on 10) The terminal of claim 10, wherein a master cell group (MCG) is controlled by the first base station, and wherein a secondary cell group (SCG) is controlled by the second base station. ### Claim 12 (depends on 10) The terminal of claim 10, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station. ### Claim 13 A second base station in a wireless communication system, the second base station comprising: a transceiver; and a controller coupled with the transceiver and configured to control to: determine to add at least one secondary cell including a primary secondary cell (PSCell) having a physical uplink control channel (PUCCH) resource, of the second base station, and transmit, on the PSCell to a terminal, master information block (MIB) or physical broadcast channel (PBCH), the MIB or the PBCH includes a system frame number (SFN) which is applied to communicate with the at least one secondary cell of the second base station, wherein a radio resource control (RRC) message which is transmitted from a first base station to the terminal for adding the at least one secondary cell to the terminal includes information for the at least one secondary cell except for the SFN. ### Claim 14 (depends on 13) The second base station of claim 13, wherein a secondary cell group (SCG) is controlled by the second base station, and wherein a master cell group (MCG) is controlled by the first base station. ### Claim 15 (depends on 13) The second base station of claim 13, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station. ### Claim 16 A first base station in a wireless communication system, the base station comprising: a transceiver; and a controller coupled with the transceiver and configured to control to: determine to add at least one secondary cell of a second base station to a terminal, and transmit, to the terminal, a radio resource control (RRC) message for adding the at least one secondary cell of the second base station, wherein the RRC message includes information for the at least one secondary cell except for a system frame number (SFN), wherein the SFN which is applied to the at least one secondary cell of the second base station is transmitted to the terminal on master information block (MIB) or physical broadcast channel (PBCH) of a primary secondary cell (PSCell) of the second base station, and wherein the PSCell is configured with a physical uplink control channel (PUCCH) resource. ### Claim 17 (depends on 16) The first base station of claim 16, wherein a master cell group (MCG) is controlled by the first base station, and a secondary cell group (SCG) is controlled by the second base station. ### Claim 18 (depends on 16) The first base station of claim 16, wherein a timing of the SFN associated with the at least one secondary cell of the second base station is different from a time of an SFN associated with at least one cell of the first base station.