# US 11,310,703 B2 · Communication apparatus, control method, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,703 B2 - Document ID: US11310703B2 - Status: Granted - Kind: B2 - Application number: 16/823,451 - Filed: 2020-03-19 - Published: 2020-10-01 - Granted: 2022-04-19 - Earliest claimed: 2019-03-26 - Assignees: Canon Kabushiki Kai sha - Applicants: Canon Kabushiki Kaisha - Inventors: Tatsuhiko Sakai - Web page: https://patentgrep.com/patent/US11310703B2 ## CPC - H04W 76/15: Setup of multiple wireless link connections - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - H04W 76/18: Management of setup rejection or failure - H04W 92/20: between access points - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A communication apparatus capable of executing concurrent communication with a first base station and a second base station based on Dual Connectivity (DC) defined in cellular communication standards of the Third Generation Partnership Project is provided. The first base station operates as a master node in the DC and the second base station operates as a secondary node in the DC. If the state of the communication apparatus has transitioned from an RRC_Inactive state to an RRC_Connected state in a state in which settings related to the DC are maintained, the communication apparatus controls the state of the communication apparatus to maintain the RRC_Connected state regardless of whether or not connection processing for establishing a connection to the second base station is successful. ## Claims ### Claim 1 A communication apparatus that executes concurrent communication with a first base station and a second base station based on Dual Connectivity (DC) defined in cellular communication standards, the first base station operating as a master node in the DC and the second base station operating as a secondary node in the DC, the communication apparatus comprising: one or more processors; and one or more memories that store computer-readable instructions that cause, when executed by the one or more processors, the communication apparatus to control a state of the communication apparatus such that, in a case where the state of the communication apparatus has transitioned from an RRC_Inactive state to an RRC_Connected state while settings related to the DC are maintained and connection processing to both the first base station and the second base station is performed, the RRC_Connected state is maintained in a case where connection processing for establishing a connection to the first base station is successful but connection processing for establishing a connection to the second base station is unsuccessful. ### Claim 2 (depends on 1) The communication apparatus according to claim 1, wherein, in the case where the communication apparatus has succeeded in connection processing for establishing a connection to the first base station in a state in which settings of the DC are maintained, the state of the communication apparatus is controlled to transition from the RRC_Inactive state to the RRC_Connected state. ### Claim 3 (depends on 1) The communication apparatus according to claim 1, wherein, in a case where the communication apparatus has failed in connection processing for establishing a connection to the first base station in a state in which settings of the DC are maintained, the state of the communication apparatus is controlled to transition from the RRC_Inactive state to an RRC_Idle state. ### Claim 4 (depends on 1) The communication apparatus according to claim 1, wherein, in the case where the state of the communication apparatus has transitioned to the RRC_Connected state and the communication apparatus has failed in the connection processing for establishing a connection to the second base station, the communication apparatus notifies the first base station of a failure of the connection processing. ### Claim 5 (depends on 4) The communication apparatus according to claim 4, wherein the communication apparatus receives a message that instructs the communication apparatus to change a configuration of the DC from the first base station, based on the notification, and changes settings of the DC based on the message. ### Claim 6 (depends on 1) The communication apparatus according to claim 1, wherein the connection processing is performed using a random access procedure. ### Claim 7 (depends on 1) The communication apparatus according to claim 1, wherein the computer-readable instruction causes, when executed by the one or more processors, the communication apparatus to notify a user that communication cannot be performed with the second base station. ### Claim 8 (depends on 1) The communication apparatus according to claim 1, wherein the first base station is a base station of Long Term Evolution (LTE) and the second base station is a base station of the Fifth Generation (5G). ### Claim 9 (depends on 1) The communication apparatus according to claim 1, wherein the communication apparatus is a digital camera. ### Claim 10 A control method to be executed by a communication apparatus that executes concurrent communication with a first base station and a second base station based on Dual Connectivity (DC) defined in cellular communication standards, the first base station operating as a master node in the DC and the second base station operating as a secondary node in the DC, the control method comprising: in a case where the state of the communication apparatus has transitioned from an RRC_Inactive state to an RRC_Connected state while settings related to the DC are maintained and connection processing to both the first base station and the second base station is performed, controlling the state of the communication apparatus to maintain the RRC_Connected state in a case where connection processing for establishing a connection to the first base station is successful but connection processing for establishing a connection to the second base station is unsuccessful. ### Claim 11 A non-transitory computer-readable storage medium storing therein a program for causing a computer that is included in a communication apparatus to control the state of the communication apparatus that is that executes concurrent communication with a first base station and a second base station based on Dual Connectivity (DC) defined in cellular communication standards of the Third Generation Partnership Project, the first base station operating as a master node in the DC and the second base station operating as a secondary node in the DC, wherein the state of the communication apparatus is controlled such that, in a case where the state of the communication apparatus has transitioned from an RRC_Inactive state to an RRC_Connected state while settings related to the DC are maintained and connection processing to both the first base station and the second base station is performed, the RRC_Connected state is maintained in a case where connection processing for establishing a connection to the first base station is successful but connection processing for establishing a connection to the second base station is unsuccessful.