# US 11,308,807 B2 · Roadside device, communication system, and danger detection method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,308,807 B2 - Document ID: US11308807B2 - Status: Granted - Kind: B2 - Application number: 16/753,566 - Filed: 2018-08-06 - Published: 2020-11-05 - Granted: 2022-04-19 - Earliest claimed: 2017-10-04 - Assignees: Panasonic Corporation - Applicants: Panasonic Corporation - Inventors: Weijie Liu; Tsuyoshi Ueno - Web page: https://patentgrep.com/patent/US11308807B2 ## CPC - G08G 1/164: {Centralised systems, e.g. external to vehicles} - B60R 21/00: Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks (safety belts or body harnesses in vehicles B60R22/00; seats constructed to protect the occupant from the effect of abnormal g-forces, e.g. crash or safety seats, B60N2/42; energy-absorbing arrangements for hand wheels for steering vehicles B62D1/11; energy-absorbing arrangements for vehicle steering columns B62D1/19) - G01S 7/003: {Transmission of data between radar, sonar or lidar systems and remote stations} - G01S 7/415: {Identification of targets based on measurements of movement associated with the target} - G01S 13/931: of land vehicles - G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) - G01S 17/931: of land vehicles - G08G 1/005: including pedestrian guidance indicator - G08G 1/0116: {from roadside infrastructure, e.g. beacons} - G08G 1/04: using optical or ultrasonic detectors - G08G 1/095: Traffic lights - G08G 1/166: {for active traffic, e.g. moving vehicles, pedestrians, bikes} - H04W 4/02: Services making use of location information - H04W 4/025: {using location based information parameters} - H04W 4/44: for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] - G01S 2013/9316: {combined with communication equipment with other vehicles or with base stations} - G01S 2013/9323: {Alternative operation using light waves} - H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks - 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}) - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - 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 To enable a risk of collision between moving objects such as a pedestrian and a vehicle to be quickly and accurately determined in a roadside device, when the roadside device receives a message including state information indicating that a pedestrian is in a risky state from a pedestrian terminal, the roadside device acquires position information of a vehicle present around the pedestrian in the risky state based on a result of detecting vehicles on roads by a radar, determines a risk of collision between the pedestrian in the risky state and the vehicle based on the position information of the vehicle, and when the risk of collision exists, transmits a message including alarm information indicating that the risk of collision exists to the terminal. ## Claims ### Claim 1 A roadside device disposed on or near a road, comprising: an object detector configured to detect moving objects on roads; a communication device configured to communicate with a terminal device carried by a moving object; and a controller that, when a message including state information indicating that the moving object is in a risky state is received by the communication device from the terminal device, acquires position information of another moving object present around the moving object in the risky state based on a detection result of the object detector, and determines a risk of collision between the moving objects based on the position information of the other moving object, wherein the controller is configured to control a detection area of the object detector based on position information of the terminal device included in the message received by the communication device such that a predetermined area around the moving object in the risky state is contained in the detection area. ### Claim 2 (depends on 1) The roadside device according to claim 1, wherein when the risk of collision exists, the controller transmits a message including alarm information indicating that the risk of collision exists from the communication device to the terminal device. ### Claim 3 (depends on 1) The roadside device according to claim 1, wherein when the risk of collision exists, the controller controls an alarm device disposed on or near a road to notify that the risk of collision exists. ### Claim 4 (depends on 1) The roadside device according to claim 1, wherein the controller is configured to determine position information of the moving object based on position information of the moving object included in the message received by the communication device and position information of the moving object obtained from the detection result of the object detector. ### Claim 5 (depends on 1) The roadside device according to claim 1 wherein the controller is configured to change a detection angle of the object detector depending on a distance between the terminal device and the roadside device. ### Claim 6 A communication system including a terminal device configured to be carded by a moving object and a roadside device disposed on or near a road, wherein the terminal device comprises; a state detector configured to detect a state of the moving object; a first communication device configured to perform Intelligent Transport System (ITS) communication; and a first controller that, when detecting a risky action of the moving object based on a detection result of the state detector, transmits a message including state information indicating that the moving object is in a risky state from the first communication device, wherein the roadside device comprises: an object detector configured to detect moving objects on roads; a second communication device configured to perform Intelligent Transport System (ITS) communication; and a second controller that, when the message including the state information is received by the second communication device from the terminal device, acquires position information of another moving object present around the moving object in the risky state based on a detection result of the object detector, and determines a risk of collision between the moving objects based on the position information of the other moving object, and wherein the second controller is configured to control a detection area of the object detector based on position information of the terminal device included in the message received by the second communication device such that a predetermined area around the moving object in the risky state is contained in the detection area. ### Claim 7 A risk detection method for detecting, in a roadside device disposed on or near a road, a risk of collision between moving objects present around the roadside device, the method comprising: when a message including state information indicating that a moving object is in a risky state is received from a terminal device carried by the moving object, acquiring position information of another moving object present around the moving object in the risky state based on a result of detecting moving objects on roads by object detection; determining a risk of collision between the moving objects based on the position information of the other moving object; and controlling a detection area of the object detection based on position information of the terminal device included in the message received from the terminal device such that a predetermined area around the moving object in the risky state is contained in the detection area.