# US 2021/0345083 A1 · Emergency Call Method and Apparatus, and System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345083 A1 - Document ID: US20210345083A1 - Status: Published application - Kind: A1 - Application number: 17/343,319 - Filed: 2021-06-09 - Published: 2021-11-04 - Earliest claimed: 2019-12-16 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Xuehuan Wang; Chao Li; Xiujiang Ma - Web page: https://patentgrep.com/patent/US20210345083A1 ## CPC - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04L 12/12: Arrangements for remote connection or disconnection of substations or of equipment thereof - H04W 4/44: for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] - H04W 24/04: Arrangements for maintaining operational condition - H04W 72/51: based on terminal or device properties - H04W 76/50: for emergency connections - H04W 84/20: Leader-follower arrangements - 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 An emergency call method applied to a vehicle-mounted communications system and the method includes a telematics box that activates a host function. The host function includes controlling a first transmission node and a peripheral connected to the first transmission node. The telematics box is coupled to the first transmission node, and the telematics box may perform data transmission with the first transmission node using the host function. The first transmission node is in a master node mode. ## Claims ### Claim 1 A communication method comprising: activating, by a telematics box, a host function comprising a function of controlling a first transmission node coupled to the telematics box and a peripheral coupled to the first transmission node; detecting, by the telematics box, that the first transmission node has switched from a slave node mode to a master node mode: and performing, by the telematics box after determining that the first transmission node has switched from the slave node mode to the master node, mode, data transmission with the first transmission node. ### Claim 2 (depends on 1) The communication method of claim 1, wherein before performing the data transmission, the communication method further comprises sending, by the telematics box to the first transmission node, a first instruction instructing the first transmission node to switch from the slave node mode to the master node mode. ### Claim 3 (depends on 1) The communication method of claim 1, wherein before performing the data transmission, the communication method further comprises: receiving, by the telematics box from the first transmission node, a second instruction instructing the telematics box to implement synchronization between the telematics box and the first transmission node; or sending, by the telematics box to the first transmission node, a third instruction is instructing the first transmission node to implement the synchronization. ### Claim 4 (depends on 1) The communication method of claim 1, wherein before activating the host function, the communication method further comprises: detecting, by the telematics box, a signal for triggering an emergency call; detecting, by the telematics box, that a transmission path between the first transmission node and a primary transmission node in a data communication system has been interrupted wherein the first transmission node belongs to the data communication system; or receiving, by the telematics box from the first transmission node, fourth instruction instructing the telematics box to activate the host function. ### Claim 5 (depends on 1) The communication method of claim 1, wherein the first transmission node a second transmission node that is a lower-level transmission node of the first transmission node, and wherein after activating the host function, the communication method further comprises: allocating, by the telematics box, a transmission resource to the second transmission node; and sending, by the telematics box, to the first transmission node, resource allocation information indicating the transmission resource corresponding to the second transmission node. ### Claim 6 (depends on 1) The communication method of claim 1, further comprising switching, by the telematics box, from being powered by the first transmission node to being powered by a local power supply. ### Claim 7 A communication method comprising: switching, by a first transmission node, from a slave node mode to a master node mode; performing, by the first transmission node, data transmission with a telematics box; and undergoing, by the first transmission node, control through a host function of the telematics box. ### Claim 8 (depends on 7) The communication method of claim 7, wherein before switching from the slave node mode to the master node mode, the communication method further comprises receiving, by the first transmission node from the telematics box, a first instruction instructing the first transmission node to switch from the slave node mode to the master node mode. ### Claim 9 (depends on 7) The communication method of claim 7, wherein before performing the data transmission, the communication method further comprises: sending, by the first transmission node to the telematics box, a second instruction instructing the telematics box to implement synchronization between the first transmission node and the telematics box; or receiving, by the first transmission node from the telematics box, the second instruction instructing the first transmission node to implement the synchronization between the first transmission node and the telematics box. ### Claim 10 (depends on 7) The communication method of claim 7, wherein before performing, the data transmission box, the communication method further comprises: detecting, by the first transmission node, a signal for triggering an emergency call or detecting that a transmission path between the first transmission node and a primary transmission node in a data communication system has been interrupted, wherein the first transmission node belongs to the data communication system; and sending, by the first transmission node to the telematics box, a third instruction instructing the telematics box to activate the host function. ### Claim 11 (depends on 7) The communication method of claim 7, wherein the first transmission node belongs to a data communication system, wherein the data communication system further, comprises a second transmission node that is a lower-level transmission node of the first transmission node, and wherein after switching from the slave node mode to the master node mode, the communication method further comprises: receiving, by the first transmission node, from the telematics box, resource allocation information indicating a transmission resource of the second transmission node; and sending, by the first transmission node to the second transmission node, configuration information indicating the transmission resource corresponding to the second transmission node. ### Claim 12 (depends on 7) The communication method of claim 7, further comprising switching, by the first transmission node, from being powered by a data communication system to being powered by the telematics box, wherein the first transmission, node the data communication system. ### Claim 13 (depends on 7) The communication method of claim 7, wherein the first transmission node belongs to a data communication system, wherein the data communication system further comprises a third transmission node, wherein the third transmission node is is a primary transmission node in the data communication system and wherein at least two transmission paths exist between the first transmission node and the third transmission node. ### Claim 14 An apparatus comprising: memory configured to store program instructions; and a processor coupled to the memory, wherein the program instructions cause the processor to be configured to: activate a host function comprising a function of controlling a first transmission node coupled to a telematics box and a peripheral coupled to the first transmission nodes; detecting that the first transmission note has switched from a slave node mode to a master node mode; and perform, after determining that the first transmission node has switched from the slave node mode to the master nod mode, data transmission with the first transmission node. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the program instructions further cause the processor to be configured to send, to the first transmission node, a first instruction instructing the first transmission node to switch from the slave node mode to the master node mode. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein before performing the data transmission, the program instructions further cause the processor to be configured to: receive, from the first transmission node, a second instruction instructing the telematics box to implement synchronization between the apparatus and the first transmission node; or send, to the first transmission node, a third instruction instructing the transmission node to implement the synchronization node. ### Claim 17 (depends on 14) The apparatus of claim 14, wherein before activating the host function, the program instructions further cause the processor to be configured to: detect a signal for triggering an emergency call; detect that a transmission path between the first transmission node and a primary transmission node in a data communication system has been interrupted, wherein the first transmission node belongs to the data communication system; or receive, from the first transmission node, fourth instruction instructing the apparatus to activate the host function. ### Claim 18 (depends on 14) The apparatus of claim 14, wherein the first transmission node belongs to a data communication system, wherein the data communication system further comprises a second transmission node, that is a lower-level transmission node of the first transmission node, and wherein after activating the host function, the program instructions further cause the processor to be configured to: allocate a transmission resource to the second transmission node; and send, to the first transmission node, resource allocation information indicating the transmission resource corresponding to the second transmission node. ### Claim 19 (depends on 14) The apparatus of claim 14, wherein the program instructions further cause the processor to be configured to switch from being powered by the first transmission node to being powered by a local power supply. ### Claim 20 (depends on 14) The apparatus of claim 14, wherein the first transmission node belongs to a data communication system and, wherein the data communication system further comprises a third transmission node and, wherein the third transmission node is a primary transmission node in the data communication system and wherein at least two transmission paths exist between the first transmission node and the third transmission node.