# US 11,310,862 B2 · Method and apparatus for operating method when terminal receives RRC reconfiguration message including configuration of secondary cell group in next-generation 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 11,310,862 B2 - Document ID: US11310862B2 - Status: Granted - Kind: B2 - Application number: 16/790,500 - Filed: 2020-02-13 - Published: 2020-08-13 - Granted: 2022-04-19 - Earliest claimed: 2019-02-13 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Seungri Jin; Soenghun Kim; Suyoung Park - Web page: https://patentgrep.com/patent/US11310862B2 ## CPC - H04W 76/27: Transitions between radio resource control [RRC] states - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/15: Setup of multiple wireless link connections - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - 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 The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides an operating method when a terminal receives an RRC reconfiguration message including configuration of a secondary cell group in a next-generation mobile communication system, and an apparatus therefor. ## Claims ### Claim 1 A method performed by a terminal in a wireless communication system, the method comprising: receiving a first radio resource control (RRC) message including RRC reconfiguration information; identifying whether the first RRC message is received via a first signaling radio bearer (SRB) or a second SRB; identifying whether the first RRC message includes a field for a secondary cell group (SCG) configuration in multi-radio dual connectivity (MR-DC); in case that the field for the SCG configuration in MR-DC is included in the first RRC message, identifying whether the RRC reconfiguration information is received within a first field associated with a new radio (NR) SCG or a second field associated with an evolved universal terrestrial radio access (EUTRA) SCG, wherein the first field and the second field are included in the field for the SCG configuration in MR-DC; in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, performing an RRC reconfiguration on the NR SCG; in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the second field, performing an RRC reconfiguration on the EUTRA SCG; and in case that the first RRC message is received via the second SRB, performing an RRC reconfiguration on the NR SCG and transmitting a second RRC message via the second SRB to a lower layer. ### Claim 2 (depends on 1) The method of claim 1, wherein the first SRB is SRB1, and the second SRB is SRB3. ### Claim 3 (depends on 1) The method of claim 1, further comprising: in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, and information for synchronous reconfiguration is included in the RRC reconfiguration information, triggering a random access procedure on the NR SCG, and wherein the random access procedure is triggered by an RRC layer. ### Claim 4 (depends on 1) The method of claim 1, further comprising: in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the second field and information for synchronous reconfiguration is included in the RRC reconfiguration information, triggering a random access procedure on the EUTRA SCG. ### Claim 5 (depends on 1) The method of claim 1, further comprising: identifying whether the DC SCG configuration information includes information on a counter associated with a key; and updating the key based on the information on the counter associated with the key, in case that the DC SCG configuration information includes the information on the counter associated with the key. ### Claim 6 A method performed by a master cell group (MCG) in a wireless communication system, the method comprising: transmitting, to a terminal, a first radio resource control (RRC) message including RRC reconfiguration information; in case that the first RRC message is received via a first signaling radio bearer (SRB) and the RRC reconfiguration information is received within a first field associated with a new radio (NR) SCG, receiving, from the terminal, a second RRC message associated with the NR SCG; and in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within a second field associated with an evolved universal terrestrial radio access (EUTRA) SCG, receiving, from the terminal, a third RRC message associated with the EUTRA SCG, wherein the first field and the second field are included in the field for the SCG configuration in multi-radio dual connectivity (MR-DC), wherein whether the first RRC message is received via the first SRB is identified by the terminal, and wherein whether the first RRC message includes a field for a secondary cell group (SCG) configuration in MR-DC is identified by the terminal. ### Claim 7 (depends on 6) The method of claim 6, wherein: a random access procedure on the NR SCG is triggered by the terminal in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, and information for synchronous reconfiguration is included in the RRC reconfiguration information, and the random access procedure is triggered by an RRC layer. ### Claim 8 (depends on 6) The method of claim 6, wherein the first SRB is SRB 1. ### Claim 9 A method performed by a secondary cell group (SCG) in a wireless communication system, the method comprising: transmitting, to a terminal, a first radio resource control (RRC) message including RRC reconfiguration information; and receiving, from the terminal, a second RRC message in case that the first RRC message is transmitted via a second signaling radio bearer (SRB) to a lower layer, wherein whether the first RRC message is received via the second SRB is identified by the terminal. ### Claim 10 (depends on 9) The method of claim 9, wherein the second SRB is SRB3. ### Claim 11 A terminal comprising: a transceiver configured to be capable of transmitting or receiving at least one signal; and a controller configured to be connected to the transceiver, the controller is configured to: receive a first radio resource control (RRC) message including RRC reconfiguration information, identify whether the first RRC message is received via a first signaling radio bearer (SRB) or a second SRB, identify whether the first RRC message includes a field for a secondary cell group (SCG) configuration in multi-radio dual connectivity (MR-DC), in case that the field for the SCG configuration in MR-DC is included in the first RRC message, identify whether the RRC reconfiguration information is received within a first field associated with a new radio (NR) SCG or a second field associated with an evolved universal terrestrial radio access (EUTRA) SCG, wherein the first field and the second field are included in the field for the SCG configuration in MR-DC, in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, perform an RRC reconfiguration on the NR SCG, in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the second field, perform an RRC reconfiguration on the EUTRA SCG, and in case that the first RRC message is received via the second SRB, perform an RRC reconfiguration on the NR SCG and transmitting a second RRC message via the second SRB to a lower layer. ### Claim 12 (depends on 11) The terminal of claim 11, wherein the first SRB is SRB1, and the second SRB is SRB3. ### Claim 13 (depends on 11) The terminal of claim 11, the controller is further configured to: in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, and information for synchronous reconfiguration is included in the RRC reconfiguration information, trigger a random access procedure on the NR SCG, wherein the random access procedure is triggered by an RRC layer. ### Claim 14 (depends on 11) The terminal of claim 11, further comprising: in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the second field and information for synchronous reconfiguration is included in the RRC reconfiguration information, triggering a random access procedure on the EUTRA SCG. ### Claim 15 (depends on 11) The terminal of claim 11, the controller is further configured to: identify whether the DC SCG configuration information includes information on a counter associated with a key, and update the key based on the information on the counter associated with the key, in case that the DC SCG configuration information includes the information on the counter associated with the key. ### Claim 16 A master cell group (MCG) comprising: a transceiver configured to be capable of transmitting or receiving at least one signal; and a controller configured to be connected to the transceiver, the controller is configured to: transmit, to a terminal, a first radio resource control (RRC) message including RRC reconfiguration information, in case that the first RRC message is received via a first signaling radio bearer (SRB) and the RRC reconfiguration information is received within a first field associated with a new radio (NR) SCG, and in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within a second field associated with an evolved universal terrestrial radio access (EUTRA) SCG, receiving, from the terminal, a third RRC message associated with the EUTRA SCG, wherein the first field and the second field are included in the field for the SCG configuration in multi-radio dual connectivity (MR-DC), wherein whether the first RRC message is received via the first SRB is identified by the terminal, and wherein whether the first RRC message includes a field for a secondary cell group (SCG) configuration in MR-DC is identified by the terminal. ### Claim 17 (depends on 16) The MCG of claim 16, wherein: a random access procedure on the NR SCG is triggered by the terminal in case that the first RRC message is received via the first SRB and the RRC reconfiguration information is received within the first field, and information for synchronous reconfiguration is included in the RRC reconfiguration information, and the random access procedure is triggered by an RRC layer. ### Claim 18 (depends on 16) The MCG of claim 16, wherein the first SRB is SRB1. ### Claim 19 A secondary cell group (SCG) comprising: a transceiver configured to be capable of transmitting or receiving at least one signal; and a controller configured to be connected to the transceiver, wherein the controller is configured to: transmit, to a terminal, a first radio resource control (RRC) message including RRC reconfiguration information, and receive, from the terminal, a second RRC message in case that the first RRC message is transmitted via a second signaling radio bearer (SRB) to a lower layer, wherein whether the first RRC message is received via the second SRB is identified by the terminal. ### Claim 20 (depends on 19) The SCG of claim 19, wherein the second SRB is SRB3.