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WO2020009546A1 - Procédé et dispositif de relais de message - Google Patents

Procédé et dispositif de relais de message Download PDF

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Publication number
WO2020009546A1
WO2020009546A1 PCT/KR2019/008328 KR2019008328W WO2020009546A1 WO 2020009546 A1 WO2020009546 A1 WO 2020009546A1 KR 2019008328 W KR2019008328 W KR 2019008328W WO 2020009546 A1 WO2020009546 A1 WO 2020009546A1
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WO
WIPO (PCT)
Prior art keywords
terminal
message
relay
point
hipa
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2019/008328
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English (en)
Korean (ko)
Inventor
박승일
최성현
황선욱
윤호영
김병준
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SNU R&DB Foundation
Original Assignee
Seoul National University R&DB Foundation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seoul National University R&DB Foundation filed Critical Seoul National University R&DB Foundation
Publication of WO2020009546A1 publication Critical patent/WO2020009546A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/20—Communication route or path selection, e.g. power-based or shortest path routing based on geographic position or location
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to a message relay method and apparatus. More particularly, the present invention relates to a method and apparatus for relaying messages for communication in a non-line of sight communication environment.
  • Vehicle networks are one of the key technologies in Intelligent Transport Systems (ITS), and various services for safety services to prevent traffic accidents are being studied.
  • the IEEE standardized the wireless LAN standard IEEE802.11p WAVE to support vehicle communications, and the Federal Communications Commission (FCC) allocated frequencies of 5.850-5.925 GHz for vehicle communications.
  • FCC Federal Communications Commission
  • the vehicle communication does not have to consider battery efficiency significantly, and has the advantage of obtaining location information by mounting GPS equipment.
  • each vehicle transmits a message (including information on location information, acceleration, speed, etc.) every cycle (for example, 100 ms) in a broadcast manner. These messages allow the vehicles to determine the status of nearby vehicles.
  • This technology is the foundation technology that can be used in the future when autonomous vehicles are deployed or driving assistance technology is developed.
  • the transmitting terminal cannot confirm whether the receiving terminal receives the message.
  • message reception is poor in a non-line of sight (NLOS) environment. Therefore, the message of the vehicle in a certain position in the road situation may not be transmitted well to the surrounding vehicles. Therefore, there is a need for a method for solving the problems of the existing inter-vehicle communication.
  • NLOS non-line of sight
  • the object of the present invention is to solve all the above-mentioned problems.
  • the present invention discloses a method for increasing communication efficiency between terminals in a non-line of sight (NLOS) environment.
  • NLOS non-line of sight
  • the relay support terminal may be determined for communication between the terminals that are incapable of communication, and the relay support terminal may determine and relay the priority of the message to be transmitted first.
  • a message relay method may include determining whether a terminal is a relay supporting terminal and relaying a message received by the terminal from another terminal, wherein the relay supporting terminal is HiPA ( Hidden Pair Awareness) is determined based on the point, the HiPA point is determined based on at least one reference point information and at least one terminal location information, the at least one reference point information may be determined based on whether or not communication between terminals. have.
  • HiPA Hidden Pair Awareness
  • a terminal for relaying a message may include a radio frequency (RF) unit for receiving the message and a processor operatively connected to the RF unit. Determine whether or not the relay support terminal, and relay the message received from the other terminal, wherein the relay support terminal is determined based on the Hipair Pair Awareness (HiPA) point, the HiPA point is at least one reference point information and The at least one reference point information may be determined based on at least one terminal location information, and the at least one reference point information may be determined based on whether communication between terminals is possible.
  • RF radio frequency
  • the relay support terminal may be selected and the relay support terminal may select and relay the isolated message. Therefore, in communication with a non-line of sight (NLOS) environment, a message transmission rate and / or reception rate may be increased, and many terminals may share location information with each other. Therefore, when applied to the inter-vehicle communication, the performance of the autonomous vehicle and the driving assistance technology can be improved.
  • NLOS non-line of sight
  • FIG. 1 is a conceptual diagram showing a vehicle-to-vehicle communication relay method according to an embodiment of the present invention.
  • FIG. 2 is a conceptual diagram illustrating an inter-vehicle communication relay method according to an embodiment of the present invention.
  • FIG. 3 is a conceptual diagram illustrating a method of determining a relay support terminal according to an embodiment of the present invention.
  • FIG. 4 is a conceptual diagram illustrating a message relay method of a relay support terminal according to an embodiment of the present invention.
  • FIG. 5 is a conceptual diagram illustrating a method for relay support terminal to relay a message according to an embodiment of the present invention.
  • FIG. 6 is a conceptual diagram illustrating a relay message transmission method according to an embodiment of the present invention.
  • FIG. 7 is a graph showing the performance of the vehicle-to-vehicle relay method according to an embodiment of the present invention.
  • FIG. 8 is a block diagram illustrating a wireless device according to an embodiment of the present invention.
  • each vehicle transmits a vehicle-to-vehicle (V2V) message at a specific cycle (for example, 100 ms).
  • the existing V2V message may include vehicle location information, vehicle acceleration information, and vehicle speed information.
  • the V2V message may be a cooperative awareness message (CAM). Through the V2V message, the vehicle may obtain information about the status of nearby vehicles.
  • the V2V message can be utilized as one piece of information for driving assistance technology and future autonomous driving technology.
  • V2V message transmission and / or reception rates are reduced in a non-line of sight (NLOS) environment. That is, according to the road situation, the message of the vehicle at a specific location may not be transmitted well to the surrounding vehicles.
  • NLOS non-line of sight
  • a method of relaying a message (eg, a V2V message) through a relay support terminal for smooth communication between terminals in a terminal to terminal communication is disclosed.
  • a message eg, a V2V message
  • a decrease in the message reception rate / transmission rate occurs in the NLOS environment.
  • an inter-vehicle communication can be effectively performed by selecting a relay support terminal for relaying messages in inter-vehicle communication.
  • the message can be effectively shared on the network between vehicles.
  • the message transmitted by the terminal includes the location information of the terminal that transmitted the message.
  • the optimal relay support terminal is selected by using the location information of the terminal included in the message. Can be.
  • the terminal is represented as a terminal for convenience of description, but the terminal may be interpreted as an in-vehicle terminal (or vehicle).
  • the terminal is represented as a message for convenience of explanation in the embodiment of the present invention, but the message may be interpreted as a vehicle-based message such as a V2V message, a V2I message, a V2P message, a V2N message, or the like. It may be.
  • the description will be made based on a vehicle, but the message transmission method according to an embodiment of the present invention may be applied to a general terminal, and such an embodiment is also included in the scope of the present invention.
  • FIG. 1 is a conceptual diagram showing a vehicle-to-vehicle communication relay method according to an embodiment of the present invention.
  • FIG. 1 a communication method between vehicles under a non-line of sight (NLOS) environment is disclosed.
  • NLOS non-line of sight
  • inter-vehicle communication may first be possible at a communication distance A under an LOS environment in which no obstacle exists.
  • the transmission range of the message is the communication distance A
  • communication between the first terminal 110 and the second terminal may first occur at the communication distance A under the LOS environment.
  • the first terminal 110 and the second terminal may be impossible at the communication distance A due to an obstacle. If an obstacle (for example, a building) exists between the first terminal 110 and the second terminal, the message may be generated due to the obstacle even when the distance between the first terminal 110 and the second terminal is less than or equal to the communication distance A. May not be able to transmit and / or receive.
  • communication between the vehicle of the first terminal 110 and the second terminal may be performed for the first time at the communication distance B.
  • FIG. The communication distance B may be shorter than the communication distance A.
  • FIG. Communication distance A may be expressed in terms of LOS initial communication distance
  • communication distance B is NLOS initial communication distance
  • the LOS initial communication distance may be expressed in terms of a criterion range 100.
  • the first terminal 110 may first receive a message transmitted by the second terminal 120 at a shorter distance than the reference range 100.
  • the location of the second terminal 120 may be a criterion point (PCP). Due to the characteristics of the short periodic message, the position of the corresponding transmitting terminal at the time when the message of the first transmitting terminal is received may be regarded as the reference point because it is similar to the reference point in view of the receiving terminal.
  • PCP criterion point
  • the second terminal 120 periodically transmits a message including the location information of the second terminal 120.
  • the first terminal 110 When the first terminal 110 first receives the message transmitted by the second terminal 120 for the first time, the first terminal 110 is a reference point based on the location information of the second terminal 120 included in the original message. 130 can be set.
  • the first terminal 110 may transmit a message including the reference point information (PCP) and the location information (PUE) of the first terminal 110 on a broadcast basis and share it with the neighboring terminals.
  • PCP reference point information
  • PUE location information
  • the reference point is determined based on the location of the terminal included in the initial message, but the reference point may be set in consideration of the location information of the terminal received in a communication range other than the initial message. Examples are also included within the scope of the present invention.
  • FIG. 2 is a conceptual diagram illustrating an inter-vehicle communication relay method according to an embodiment of the present invention.
  • FIG. 2 a method for determining a Hidden Pair Awareness (HiPA) point 200 based on reference point information P CP and terminal location information P UE is disclosed.
  • HiPA Hidden Pair Awareness
  • a plurality of terminals may share reference point information and terminal location information in a specific road environment.
  • a plurality of straight lines may be drawn based on the plurality of reference point information and the plurality of terminal position information, and the HiPA point 200 may be determined based on a plurality of intersection points between the plurality of straight lines. For example, when a plurality of intersections are generated by a plurality of straight lines, the average point of the plurality of intersections may be the HiPA point 200.
  • various methods besides the average point may be used, and such embodiments are also included in the scope of the present invention.
  • each terminal may know road information, and each road may be assumed to be one straight line (or lane).
  • each road may be assumed to be one straight line (or lane).
  • it may be determined whether communication between vehicles is possible without considering the separate HiPA point 200. Even when the advancing directions of the terminals are different from each other, it is possible to determine whether communication between vehicles is possible on the same straight line without considering a separate HiPA point 200.
  • the two terminals When the two terminals exist on different straight lines, it may be determined whether communication between vehicles is possible in consideration of the HiPA point 200. When roads of different directions (or different angles) meet and a left turn or a right turn is required to move on the same road, the two terminals may be on different straight lines. In this case, it may be determined whether communication between vehicles is possible in consideration of the HiPA point 200.
  • the two terminals may be represented by the term hidden pair 240.
  • the two terminals In order for the two terminals to be the exposed pair 220, the length of the line segment connecting the two terminals ( ), An extension line connecting the HiPA point 200 is connected to a straight line corresponding to the road (or lane) in which the other terminal is located in one of the two terminals on a specific road (or lane). When the length of that segment is If) is longer, the two terminals may be an exposed pair 220.
  • the two terminals may be hidden pairs 240.
  • each terminal may operate as a relay support terminal based on the HiPA point 200.
  • the terminal may determine whether it can operate as a relay support terminal at the location P UE of the terminal based on the straight line information corresponding to the road information and the HiPA point 200.
  • the HiPA point 200 may be determined by the terminal itself by communication between terminals, or information about the HiPA point 200 in the environment may be transmitted to the terminal through a separate server.
  • the server may receive information about the HiPA point 200 or information for determining the HiPA point 200 from the terminal, determine the HiPA point 200 based on this information, or 200 may be accumulated continuously.
  • the vehicle passing the environment may receive the information on the HiPA point 200 by the server without additional determination, or may determine the HiPA point 200 by additionally considering the current situation information on the HiPA point information transmitted by the server.
  • FIG. 3 is a conceptual diagram illustrating a method of determining a relay support terminal according to an embodiment of the present invention.
  • FIG. 3 a method for determining a relay support terminal based on road information, HiPA point information, and terminal location information is disclosed.
  • a first straight line 330 corresponding to another road that meets a straight line that is not a straight line corresponding to the road corresponding to the current terminal location connects the current terminal location and the HiPA point 300.
  • the point where the second straight line 320 meets may be defined as a relay determination point (I LH ) 340.
  • the relay determination point 340 is a straight line 330 corresponding to the lane meeting the lane corresponding to the current terminal location 310, the terminal location (P UE ) 310, and the HiPA point (P H ) 300. It may be an intersection point between the straight lines 320 connecting the.
  • the terminal may be determined as a relay support terminal.
  • the current terminal location (P UE ) 310 If satisfied, the terminal may be determined to be a relay support terminal.
  • the terminal determined as the relay support terminal may re-broadcast the message received from another terminal based on the relay.
  • the vehicle When there are a plurality of HiPA points, when a straight line generated based on each of the plurality of HiPA points satisfies the above condition, the vehicle may be determined as a relay support vehicle.
  • the first relay determination point I LH1 390 may be determined based on the first HiPA point (P H1 ) 360 and the current terminal location (P UE ) 350.
  • the second relay determination point I LH2 380 may be determined based on the second HiPA point (P H2 ) 370 and the current terminal location (P UE ) 350.
  • HiPA points When a plurality of HiPA points exist within a communication range of the vehicle, it may be determined whether the conditions for operating as the relay support terminal described above are satisfied at the top of FIG. 3 based on each of the plurality of HiPA points.
  • the distance between the current terminal location (P UE ) 350 and the first relay determination point (I LH1 ) 390 is the first relay determination point (I LH1 ) 390 and the first HiPA point (P). It may be determined whether it is smaller than the distance between H1 ) 360.
  • the distance between the current terminal location (P UE ) 350 and the second relay determination point (I LH2 ) 380 is equal to the second relay determination point (I LH2 ) 380 and the second HiPA point (P). It may be determined whether it is smaller than the distance between H2 ) 370.
  • the terminal may operate as a relay support terminal.
  • FIG. 4 is a conceptual diagram illustrating a message relay method of a relay support terminal according to an embodiment of the present invention.
  • a terminal determined as a relay support terminal may perform relay on a message received from another terminal.
  • the relay support terminal may be performed in consideration of a transmission priority.
  • the black dot corresponds to the location of each terminal capable of successfully receiving (or receiving) a message by the relay support terminal (R-UE).
  • the rectangular shape may be an obstacle in a communication environment that creates an NLOS environment such as a building.
  • the relay support terminal may determine whether to relay the message transmitted by each terminal as follows.
  • the messages may be selected and transmitted in the order of high priority.
  • the priority of message i is It can be defined as.
  • H i represents the ratio of the hidden pairs (hidden pair) between the neighboring terminals in the location of a terminal transmitting the message.
  • H i is the ratio of the hidden pairs among all possible communication pairs in the reference range (criterion range).
  • N i is the number of retransmissions of the message.
  • the terminal 2 420 may perform inter-vehicle communication with the terminal 1 410 and the terminal 3 430 in an LOS environment. However, the terminal 2 420 should communicate with the terminal 4 440 and the terminal 5 450 in the NLOS environment.
  • a straight line connecting the terminal 2 420 and the terminal 4 440 is shorter than a straight line connecting the relay determination point through the terminal 2 420 and the HiPA point. Accordingly, the terminal 2 420 and the terminal 4 440 can communicate as an exposed pair.
  • the straight line connecting the terminal 2 (420) and the terminal 5 (450) is longer than the straight line connecting the relay determination point through the terminal 2 (420) and HiPA point. Accordingly, the terminal 2 420 and the terminal 5 450 are hidden pairs and cannot communicate without the relay support terminal.
  • H 1 based on the terminal 2 420 has a value of 1/4.
  • the terminal 3 430 may perform communication between vehicles with the terminal 1 410 and the terminal 2 420 in an LOS environment. However, terminal 3 430 should communicate with terminal 4 440 and terminal 5 450 in an NLOS environment.
  • the straight line connecting the terminal 3 430 and the terminal 4 440 is shorter than the straight line connecting the relay determination point through the terminal 2 420 and the HiPA point. Accordingly, the terminal 3 430 and the terminal 4 440 can communicate as an exposed pair.
  • the straight line connecting the terminal 3 (430) and the terminal 5 (450) is shorter than the straight line connecting the relay determination point passing through the terminal 3 (430) and HiPA point. Accordingly, the terminal 3 430 and the terminal 5 450 can communicate as an exposed pair.
  • H 2 based on the terminal 3 430 has a value of 0/4.
  • the terminal 1 410 may perform communication between vehicles with the terminal 2 420 and the terminal 3 430 in an LOS environment. However, terminal 1 410 must communicate with terminal 4 440 in an NLOS environment.
  • the terminal 5 450 may be located at a position out of a communication range with the terminal 1 410.
  • the straight line connecting the terminal 1 410 and the terminal 4 440 is shorter than the straight line connecting the relay determination point through the terminal 1 410 and the HiPA point. Accordingly, the terminal 1 410 and the terminal 4 440 can communicate as an exposed pair.
  • H 3 based on the terminal 1 410 has a value of 1/3.
  • FIG. 5 is a conceptual diagram illustrating a method for relay support terminal to relay a message according to an embodiment of the present invention.
  • FIG. 5 a situation in which a relay support terminal relays a message is disclosed.
  • the relay support terminal 500 may satisfy the above-described condition of FIG. 3. As described above, the distance between the current terminal position P UE and the first relay determination point I LH1 is the distance between the first relay determination point I LH1 and the first HiPA point P H1 under the first condition. It may be determined whether it is shorter.
  • the terminal may operate as the relay support terminal 500.
  • the relay support terminal 500 may broadcast a message received from the first terminal 510 and / or the second terminal 520.
  • FIG. 6 is a conceptual diagram illustrating a relay message transmission method according to an embodiment of the present invention.
  • FIG. 6 a method for determining the priority of relayed (or relayed) messages is disclosed.
  • the higher the ratio of the hidden pair the more terminals that do not receive the message sent by the corresponding terminal.
  • the need for relaying can be relatively higher.
  • messages may be selected and transmitted in order of high priority.
  • the priority of message 3 600 may be 1/8, which is the largest value. Therefore, message 3 600 may be transmitted in preference to other messages.
  • the transmission priority of the message 3 600 is determined by the above-described formula (FIG. 4). ) Will be lowered to 1/16. That is, the probability of repeated retransmission may be lowered, and the priority of message transmission may be determined so that retransmission of a message that has not been retransmitted occurs.
  • FIG. 7 is a graph showing the performance of the vehicle-to-vehicle relay method according to an embodiment of the present invention.
  • FIG. 7 the performance of the inter-vehicle relay method and other communication methods according to the embodiment of the present invention in the LOS environment and the NLOS environment is disclosed.
  • HiPA-CAM selection 700 is a case where communication is performed through a method of setting a HiPA point and a message priority setting according to an embodiment of the present invention.
  • BuildingEdge-CAM selection (710) determines the exposed pair, the hidden pair based on the geographic point of the obstacle, such as the building edge, without determining a separate HiPA point, relaying, but through the message priority setting method This is the case when communication is performed.
  • HiPA-CAM Random 720 is a case of transmitting a message on a random basis without using the method of setting the HiPA point and the message priority setting according to an embodiment of the present invention.
  • HiPA-CAM Worst 730 is a case of transmitting a message with the worst selection in setting and random-based transmission of a HiPA point according to an embodiment of the present invention.
  • No relaying 740 is a case in which the relay support terminal does not perform relaying (or relaying) of a message.
  • the MRR may not differ in each situation.
  • the transmission MRR may have a value of 3/4.
  • the MRR may be reduced in the order of HiPA-CAM selection 700, Building Edge-CAM selection 710, HiPA-CAM Random 720, HiPA-CAM Worst 730, and no relaying 740.
  • the message relay method in order to improve the problem of the existing message transmission, a relay support terminal is determined in communication, and the relay support terminal may relay (or relay) a message. Therefore, the message reception rate is high in communication in the NLOS environment, and many vehicles can share each other's location information. Therefore, vehicle driving performance can be improved when communication with a vehicle such as autonomous driving is required.
  • FIG. 8 is a block diagram illustrating a wireless device according to an embodiment of the present invention.
  • the wireless device may be a transmitter or a receiver capable of implementing the above-described embodiment.
  • the transmitter 800 includes a processor 810, a memory 820, and a radio frequency unit 830.
  • the RF unit 830 may be operatively connected to the processor 810 to transmit / receive a radio signal.
  • the processor 810 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 810 may perform an operation of the transmitter disclosed in the embodiment of FIGS. 1 to 7.
  • the processor 810 may be implemented to determine whether the terminal is a relay support terminal and to relay the message received from another terminal.
  • the relay support terminal is determined based on a Hipair Pair Awareness (HiPA) point
  • HiPA point is determined based on at least one reference point information and location information of at least one terminal, and at least one reference point information is capable of communication between terminals. It can be determined based on.
  • HiPA Hipair Pair Awareness
  • the at least one reference point information is a location of each of the at least one first communication terminal that initially communicated with each of the at least one terminal
  • the HiPA point is a location of each of the at least one terminal and each of the at least one first communication terminal. It can be determined based on.
  • the relay support terminal may be determined based on the relay determination point, and the relay determination point may be determined based on the position of the terminal and the HiPA point.
  • the message may be relayed based on priority, and the priority may be determined based on a ratio of a hidden pair between the transmitting terminal transmitting the message and the neighboring terminal and the number of retransmissions of the message.
  • the receiver 850 includes a processor 860, a memory 870, and a radio frequency unit 880.
  • the RF unit 880 may be connected to the processor 860 to transmit / receive a radio signal.
  • the processor 860 may implement the functions, processes, and / or methods proposed in the present invention.
  • the processor 860 may be implemented to perform an operation of a receiver (terminal, relay support terminal) according to the above-described embodiment of the present invention.
  • the processor 860 may receive a relayed message, relay the received message, or determine a HiPA point based on the received message.
  • Processors 810 and 860 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memories 820 and 870 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
  • the RF unit 830, 880 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memory 820, 870 and executed by the processor 810, 860.
  • the memories 820 and 870 may be inside or outside the processors 810 and 860, and may be connected to the processors 810 and 860 by various well-known means.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de relais de message. Le procédé de relais de message peut comprendre les étapes consistant : à déterminer si un terminal est un terminal de support de relais ; et à permettre au terminal de relayer un message reçu d'un autre terminal, le terminal de prise en charge de relais étant déterminé sur la base d'un point de conscience de paire cachée (HiPA), le point HiPA étant déterminé sur la base d'au moins un élément d'informations de point de référence et d'au moins un élément d'informations d'emplacement de terminal, et le ou les éléments d'informations de point de référence pouvant être déterminés sur la base du fait que la communication est possible ou pas entre les terminaux.
PCT/KR2019/008328 2018-07-06 2019-07-05 Procédé et dispositif de relais de message Ceased WO2020009546A1 (fr)

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