# US 8,543,319 B2 · Communication equipment, inter-vehicle communication control method and inter-vehicle communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,319 B2 - Document ID: US8543319B2 - Status: Granted - Kind: B2 - Application number: 13/105,886 - Filed: 2011-05-11 - Published: 2011-11-17 - Granted: 2013-09-24 - Earliest claimed: 2010-05-12 - Assignees: Renesas Electronics Corporation - Applicants: Takashi Kawauchi; Yuki Horita; Tatsuaki Osafune - Inventors: Takashi Kawauchi; Yuki Horita; Tatsuaki Osafune - Web page: https://patentgrep.com/patent/US8543319B2 ## CPC - H04W 4/46: for vehicle-to-vehicle communication [V2V] - G08G 1/093: {Data selection, e.g. prioritizing information, managing message queues, selecting the information to be output} - G08G 1/0965: responding to signals from another vehicle, e.g. emergency vehicle - G08G 1/161: {Decentralised systems, e.g. inter-vehicle communication} - G08G 1/162: {event-triggered} - H04W 4/90: Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS] - H04W 40/20: based on geographic position or location - H04W 76/50: for emergency connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93}) ## Abstract Communication equipment that received transfer data including data to be transferred, position information of a destination of the data to be transferred, position information of relay points used to determine a route to the destination, and position information of a last transferring vehicle determines a standby time that becomes shorter as a distance between the position of the last transferring vehicle and the position of a host vehicle becomes longer in the case where the host vehicle is not located in a predetermined range on the basis of the relay points. In addition, the communication equipment determines the standby time that becomes longer as a distance between the position of the host vehicle and the position of the relay point becomes longer in the case where the host vehicle is located in the predetermined range, and performs a process of transmitting the transfer data after the standby time passes. ## Claims ### Claim 1 A communication device comprising: a transmission/reception unit that receives transfer data for indicating vehicle running conditions, and performs a process of transmitting the transfer data after passage of a standby time following receipt of the transfer data; and a data processing unit that performs a process of calculating the standby time on the basis of the position of a host vehicle and the received transfer data, wherein the transfer data for indicating the vehicle running conditions comprise data to be transferred, position information of a destination of the data to be transferred, position information of relay points used to determine a route to the destination, and position information of a last transferring vehicle, and wherein, in the case where the host vehicle is not located in a predetermined range on the basis of the relay points, the data processing unit sets a first time as the standby time that becomes shorter as a distance between the position of the last transferring vehicle and the position of the host vehicle becomes longer, and in the case where the host vehicle is located in the predetermined range, the data processing unit sets a second time as the standby time that becomes longer as a distance between the position of the host vehicle and the position of a relay point becomes longer. ### Claim 2 (depends on 1) The communication device according to claim 1, wherein the data processing unit calculates a first distance between the position of the last transferring vehicle and the position of the destination through the relay points and a second distance between the position of the host vehicle and the position of the destination through the relay points, and if the second distance is longer than the first distance, the data processing unit stops the process of transmission. ### Claim 3 (depends on 2) The communication device according to claim 2, wherein the second time is set shorter than the first time. ### Claim 4 (depends on 2) The communication device according to claim 2, wherein in the case where another piece of transfer data comprising the same data as the data to be transferred comprised in the transfer data is received during waiting for the process of transmission of the transfer data, the transmission/reception unit stops the process of transmission. ### Claim 5 (depends on 2) The communication device according to claim 2, wherein the data processing unit further generates host-vehicle information comprising position information of the host vehicle, and sets, as new transfer data, data to which the host-vehicle information is added in place of the position information of the last transferring vehicle in the received transfer data. ### Claim 6 (depends on 2) The communication device according to claim 2, wherein the data to be transferred comprise position information of an emergency vehicle, position information of a general vehicle, or position information of a broken vehicle. ### Claim 7 (depends on 2) The communication device according to claim 2, wherein the position information of the last transferring vehicle further comprises information for indicating the travelling direction of the last transferring vehicle, and wherein the data processing unit determines whether or not to execute the process of transmission on the basis of the travelling direction of the last transferring vehicle and the travelling direction of the host vehicle. ### Claim 8 An inter-vehicle communication control method for transmitting and receiving, using communication control equipment, data for indicating vehicle running conditions comprising data to be transferred, position information of a destination of the data to be transferred, position information of relay points used to determine a route to the destination, and position information of the last transferring vehicle, the method comprising: a first step of receiving the data for indicating the vehicle running conditions transferred by another vehicle; a second step of calculating, after the first step, a first distance between the position of the last transferring vehicle that transferred the received data and the position of the destination through the relay points and a second distance between the position of the host vehicle and the position of the destination through the relay points; a third step of calculating a standby time following receipt of the received data to the transfer of the received data for indicating the vehicle running conditions on the basis of the position of the host vehicle and the data received in the first step, if the first distance calculated in the second step is shorter than the second distance; and a fourth step of transferring the data for indicating the vehicle running conditions to another vehicle after the standby time calculated in the third step passes, wherein in the case where the host vehicle is not located in a predetermined range on the basis of the relay points, a first time is set as the standby time in the third step that becomes shorter as a distance between the position of the last transferring vehicle and the position of the host vehicle becomes longer, and in the case where the host vehicle is located in the predetermined range, a second time is set as the standby time in the third step that becomes longer as a distance between the position of the host vehicle and the position of the relay point becomes longer. ### Claim 9 (depends on 8) The inter-vehicle communication control method according to claim 8, wherein in the case where data comprising the same data as the data to be transferred are received from another vehicle before the standby time used to perform the fourth step passes, the fourth step is stopped.