# US 9,882,791 B2 · Reducing received data in a V2X network based on received signal strength > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,791 B2 - Document ID: US9882791B2 - Status: Granted - Kind: B2 - Application number: 14/911,801 - Filed: 2014-08-22 - Published: 2016-07-07 - Granted: 2018-01-30 - Earliest claimed: 2013-08-22 - Assignees: Continental Teves AG & Co. oHG - Applicants: Continental Teves AG & Co. oHG - Inventors: Thomas Grotendorst; Marc Menzel; Richard Scherping; Ulrich Stählin - Web page: https://patentgrep.com/patent/US9882791B2 ## CPC - H04L 43/028: by filtering - G08G 1/093: {Data selection, e.g. prioritizing information, managing message queues, selecting the information to be output} - G08G 1/162: {event-triggered} - G08G 1/163: {involving continuous checking} - H04B 17/318: Received signal strength - H04L 47/27: Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets - 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 - H04L 67/5651: Reducing the amount or size of exchanged application data - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - G08G 1/09675: {where a selection from the received information takes place in the vehicle} - G08G 1/096791: {where the origin of the information is another vehicle} - G08G 1/166: {for active traffic, e.g. moving vehicles, pedestrians, bikes} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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}) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method for filtering a transmission signal transmitted in a vehicular ad hoc network, the signal carrying at least position data of participants in data packets. The method includes the following steps: receiving the transmission signal; filtering the data packets from the transmission signal based on a receive filter having a predetermined receive filter specification for demodulating the data packets from the transmission signal, and an additional predetermined condition; and distributing the filtered data packets to a data processing unit superordinate to the receive filter. ## Claims ### Claim 1 A method for filtering a transmission signal transmitted in a vehicular ad hoc network, which signal carries in data packets at least position data about participants, the method comprising: receiving a transmission signal; filtering the data packets from the transmission signal on the basis of a receive filter that has a predetermined receive filter specification for demodulating the data packets from the transmission signal and an additional predetermined condition; and outputting the filtered data packets to a data processing unit at a higher level than the receive filter, wherein the predetermined condition comprises a minimum signal strength that the transmission signal must possess at the position of a specific data packet, and wherein the minimum signal strength is dependent on a processing load of the receive filter and/or of the data processing unit. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the minimum signal strength depends on at least one normalized value for the transmission signal in a predetermined time window. ### Claim 3 (depends on 2) The method as claimed in claim 2, wherein the minimum signal strength is selected such that in the predetermined time window, a number of data packets that are transmitted by the transmission signal in the time window with the highest signal strengths are selected from the transmission signal. ### Claim 4 (depends on 2) The method as claimed in claim 2, wherein the data packets are filtered first on the basis of the minimum signal strength, which is dependent on the processing load, and then on the basis of an additional minimum signal strength, which is referred to the normalized value. ### Claim 5 (depends on 4) The method as claimed in claim 4, wherein the additional minimum signal strength is greater than the minimum signal strength. ### Claim 6 (depends on 2) The method as claimed in claim 2, wherein the data packets are filtered first on the basis of the minimum signal strength, which is dependent on the processing load, and then on the basis of an additional minimum signal strength, which is referred to the normalized value. ### Claim 7 (depends on 1) The method as claimed in claim 1, wherein the value of the minimum signal strength has an absolute maximum. ### Claim 8 (depends on 1) A filter device for implementing a method as claimed in claim 1. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein the minimum signal strength depends on at least one normalized value for the transmission signal in a predetermined time window. ### Claim 10 A receiver for a vehicle for the purpose of receiving messages packaged in data packets using a transmission signal in a vehicular ad hoc network comprises: an antenna for receiving the transmission signal; a filter device filtering the data packets from the transmission signal on the basis of a predetermined filter specification for demodulating the data packets from the transmission signal and an additional predetermined condition, and outputting the filtered data packets to a data processing unit at a higher level than the filter device, wherein the predetermined condition comprises a minimum signal strength that the transmission signal must possess at the position of a specific data packet, and wherein the minimum signal strength is dependent on a processing load of the receive filter and/or of the data processing unit; and a display device for extracting the messages from the filtered data packets.