WO2014061198A1 - Système de distribution d'informations de trafic, système de communication cellulaire, terminal de communication et serveur d'informations de trafic - Google Patents

Système de distribution d'informations de trafic, système de communication cellulaire, terminal de communication et serveur d'informations de trafic Download PDF

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Publication number
WO2014061198A1
WO2014061198A1 PCT/JP2013/005445 JP2013005445W WO2014061198A1 WO 2014061198 A1 WO2014061198 A1 WO 2014061198A1 JP 2013005445 W JP2013005445 W JP 2013005445W WO 2014061198 A1 WO2014061198 A1 WO 2014061198A1
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WIPO (PCT)
Prior art keywords
traffic information
communication terminal
information
cellular communication
distribution
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PCT/JP2013/005445
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English (en)
Japanese (ja)
Inventor
孝法 岩井
健一 山岬
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日本電気株式会社
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Priority to JP2014541916A priority Critical patent/JP6344239B2/ja
Publication of WO2014061198A1 publication Critical patent/WO2014061198A1/fr

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Definitions

  • the present invention relates to a traffic information distribution system.
  • ITS Intelligent Transport Systems
  • the traffic information provided to the passenger is, for example, traffic jam information, accident information, and safe driving support information.
  • the safe driving support information is, for example, information indicating a dangerous location (e.g. sudden curve, tunnel, accident occurrence location), recommended traveling speed, road weather information, and the like.
  • the vehicle-mounted device typically receives traffic information by wireless communication with a roadside wireless device (hereinafter referred to as RSU (Road-Side Unit)) installed on the side of the road. Then, the vehicle-mounted device notifies the passenger of traffic information by voice, text, image, or a combination thereof.
  • RSU Roadside wireless device
  • ITS spot service using DSRC (Dedicated Short Range Communications) has been put into practical use.
  • DSRC uses an ISM (Industry-Science-Medical) band of 5.8 GHz band.
  • ISM Industry-Science-Medical
  • traffic information is sent from the RSU called ITS spot to the vehicle-mounted device.
  • a typical example of broadcast information is emergency information.
  • the emergency information includes, for example, an urgent message regarding disasters such as earthquakes and tsunamis.
  • 3GPP (3rd Generation Partnership Project) defines the architecture and protocol for broadcast distribution of emergency information as CBS (Cell Broadcast Service) and ETWS (Earthquake and Tsunami Warning System).
  • the emergency information delivery procedure in UMTS is defined in 3GPP TS 23.041 as CBS.
  • the emergency information delivery procedure in EPS is defined as “Warning message delivery” procedure in Chapter 5.12 of 3GPP TS 23.401.
  • FIG. 17 shows a configuration diagram of an emergency information distribution network in UMTS and EPS.
  • FIG. 18 is a sequence diagram showing a procedure for distributing emergency information in UMTS described in 3GPP TS 23.041.
  • FIG. 19 is a sequence diagram showing an emergency information delivery procedure in EPS described in 3GPP TS 23.401, chapter 5.12.
  • the CBE (Cell Broadband Entity) described in FIGS. 17 to 19 is a device / system that makes an emergency information transmission request.
  • a server of the Japan Meteorological Agency that transmits an earthquake early warning corresponds to CBE.
  • CBC Cell Broadcast Center
  • receives an emergency information transmission request from CBE determines a delivery area of emergency information, and determines the content of emergency information.
  • the distribution area is a sector unit, a cell unit, a location registration area (eg routing area, tracking area) unit, based on information for specifying a target area included in the emergency information transmission request received from the CBE, or It is determined in any other area unit determined by the carrier.
  • the CBC has an interface with RNC (Radio Network Controller) or SGSN (Serving GPRS Support Node).
  • RNC Radio Network Controller
  • SGSN Serving GPRS Support Node
  • the CBC is connected to the RNC.
  • the CBC sends a Write-Replace message to the RNC.
  • the Write-Replace message includes the contents of emergency information to be distributed to the mobile station and the designation of the distribution area.
  • the RNC determines a base station (NodeB) to which emergency information should be distributed, and requests the target base station (NodeB) to broadcast emergency information.
  • NodeB base station
  • the emergency information is called “CBS message” and is transmitted using a CTCH (Common Traffic Channel) which is a downlink logical channel.
  • CTCH Common Traffic Channel
  • FACH Forward (Access Channel) which is a transport channel
  • S-CCPCH Secondary Common Control Physical Channel
  • the base station (NodeB) transmits CTTH Indicator indicating transmission of the downlink CTTH as broadcast information.
  • CTTH Indicator is transmitted as one piece of broadcast information (BCCH (Broadcast Control Channel)) transmitted by P-CCPCH (Primary Common Control Physical Channel).
  • BCCH Broadcast Control Channel
  • P-CCPCH Primary Common Control Physical Channel
  • the base station (NodeB) transmits a paging message indicating that the broadcast information (BCCH) is changed on the S-CCPCH, thereby prompting the mobile station in a standby state to receive the broadcast information.
  • BCCH Broadcast Control Channel
  • a mobile station In UMTS / UTRAN (UMTS Terrestrial Radio Access Network), a mobile station (UE (User Equipment)) in a standby state (CELL_PCH state, URA_PCH state) receives CTTH included in broadcast information (BCCH) in response to reception of a paging message. Get Indicator. Then, when CTTH Indicator is set, the mobile station starts CTTH monitoring and receives emergency information.
  • BCCH broadcast information
  • ETWS Earthquake Tsunami Warning System
  • 3GPP 3GPP as an extension of CBS.
  • a Primary Notification message is transmitted using a paging message indicating that there is a change in broadcast information.
  • Primary Notification includes “Warning Type”.
  • the mobile station warns the user in response to receiving the paging message (Primary Notification) (eg pop-up display, warning sound Output) can be started quickly.
  • the mobile station in the communication state CELL_DCH state
  • the emergency information can also receive the emergency information.
  • the distribution of emergency information in the EPS shown in FIG. 19 is also performed with the same architecture as the UMTS CBS described above.
  • CBC is connected to MME (Mobility Management Entity), and emergency information is supplied to the base station (eNodeB) via MME.
  • the base station (eNodeB) transmits an ETWS Indication bit indicating that emergency information is distributed using a paging message.
  • the paging message is mapped to PCH (Paging Channel) and transmitted on PDSCH (Physical Downlink Shared Channel).
  • PDSCH Physical Downlink Shared Channel
  • the base station (eNodeB) transmits emergency information called “ETWS Message” included in broadcast information (SIB (System Information Block)).
  • SIB System Information Block
  • ETWS Message includes “Warning type” as PrimaryPrimNotification and “Warning message” as Secondary Notification.
  • “Warning type” is transmitted by SIB10
  • “Warning message” is transmitted by SIB11.
  • the base station (eNodeB) broadcasts emergency information (ETWS Message) in the cell using BCCH (Broadcast Control Channel) / DL-SCH (Downlink Shared Channel) / PDSCH (Physical Downlink Shared Channel).
  • BCCH Broadcast Control Channel
  • DL-SCH Downlink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the mobile station of EPS / E-UTRAN (Evolved UTRAN) tries to receive a paging message at least once in Default Paging Cycle, regardless of whether it is in a standby state (RRC_IDLE state) or a communication state (RRC_CONNECTED state). Then, the mobile station starts receiving broadcast information (SIB) including emergency information in response to receiving the paging message in which the ETWS ⁇ ⁇ ⁇ Indication bit is set.
  • SIB broadcast information
  • the emergency information may be broadcasted using the MBMS (Multimedia Broadcast Multicast Service) method, as disclosed in Patent Documents 1 and 2.
  • MBMS Multimedia Broadcast Multicast Service
  • JP 2011-61831 A International Publication No. 2006/066629
  • ⁇ RSUs for ITS spot service are installed about every 10-15 km on the intercity expressway and about 4 km on the expressway in the city.
  • the DSRC communication distance used in the ITS spot service is limited to about several to 30 m.
  • the RSU communicates with cars passing through the vicinity of the RSU one after another while traveling on the road.
  • the vehicle-mounted device that is, the communication terminal installed in the automobile can communicate with the RSU every time it travels about 4 km or 10 km.
  • ITS spot service using DSRC can provide traffic information specialized for the place where the car is located because the communication distance is short.
  • the vehicle-mounted device (communication terminal) installed in the automobile cannot communicate until it approaches the RSU and cannot obtain the latest information. For example, considering the case where RSUs are installed at intervals of 10 km, an automobile traveling at 100 km / h can communicate with the RSU only once every 6 minutes. In addition, when the traveling speed of the automobile is low due to traffic congestion or the like, the interval until the automobile can communicate with the next RSU after it communicates with the RSU is naturally long.
  • One of the objects of the present invention is to provide a traffic information distribution system, a cellular communication system, a communication terminal, a traffic information server, and a method and a program related thereto that can provide the latest traffic information to passengers without delay. That is.
  • the traffic information distribution system includes a cellular communication network, a traffic information server, and a communication terminal.
  • the cellular communication network is configured to broadcast broadcast information using a downlink physical channel that can be received by a plurality of mobile stations in a standby state.
  • the traffic information server is configured to request the cellular communication network for broadcast distribution of traffic information within a distribution area.
  • the communication terminal is arranged in an automobile and is configured to receive the traffic information distributed as the broadcast information via the cellular communication network.
  • the cellular communication system includes a distribution server and a network.
  • the distribution server receives a request for broadcast distribution of traffic information within the distribution area from the traffic information server.
  • the network communicates with the distribution server and uses the downlink physical channel that can be received by a plurality of standby mobile stations in a first cell group including at least one cell corresponding to the distribution area. Broadcast information.
  • the communication terminal includes a cellular communication unit and a control unit.
  • the cellular communication unit receives traffic information broadcast from a cellular communication network on a downlink physical channel that can be received by a plurality of mobile stations in a standby state.
  • the control unit controls to notify the user of the traffic information.
  • the traffic information server includes a determination unit and a communication unit.
  • the determination unit determines a traffic information distribution area.
  • the communication unit is configured to broadcast the traffic information using a downlink physical channel that can be received by a plurality of standby mobile stations in at least one cell corresponding to the distribution area. Communicate with the distribution server.
  • a communication terminal control method includes: (A) receiving traffic information broadcast from a cellular communication network in a downlink physical channel that can be received by a plurality of mobile stations in a standby state; and (b) notifying the user of the traffic information. including.
  • the traffic information server control method comprises: (A) determining a traffic information distribution area; and (b) using at least one cell corresponding to the distribution area, the traffic information using a downlink physical channel that can be received by a plurality of standby mobile stations. Communicate with a distribution server in a cellular communication network to broadcast including.
  • the program includes a group of instructions for causing a computer to perform the communication terminal control method according to the fifth aspect described above.
  • the program includes a group of instructions for causing a computer to perform the traffic information server control method according to the sixth aspect described above.
  • a traffic information distribution system a cellular communication system, a communication terminal, a traffic information server, and a method and program related thereto that can provide the latest traffic information to passengers without delay.
  • FIG. 1 is a block diagram illustrating a configuration example of a traffic information distribution system 1 according to the present embodiment.
  • the traffic information distribution system 1 includes a cellular communication system 10, a communication terminal 200 disposed in an automobile 500, and a traffic information server 300.
  • the cellular communication system 10 is configured to broadcast broadcast information using a downlink physical channel that can be received by a plurality of mobile stations (including the communication terminal 200) in a standby state. Such broadcast delivery by the cellular communication system 10 may be referred to as cell broadcast below.
  • the cellular communication system 10 shown in FIG. 1 includes a broadcast distribution server 100, a control node 110, and a base station 120 as nodes related to cell broadcast.
  • the cellular communication system 10 is, for example, a UMTS, EPS, or CDMA2000 system.
  • the cellular communication system 10 may transmit broadcast information in units of sectors, cells, multiple cells, or location registration areas by, for example, CBS, ETWS, or BC-SMS (Broadcast Short Message Service).
  • BC-SMS is a broadcast delivery system standardized in CDMA2000 of 3GPP2 (Third Generation Partnership Project 2).
  • broadcast delivery of broadcast information by the cellular communication system 10 will be briefly described.
  • the broadcast distribution server 100 corresponds to a CBC (Cell Broadband Center) in UMTS or EPS. That is, the broadcast distribution server 100 determines a sector, a cell, a cell group, or a location registration area for distributing broadcast transmission information.
  • the control node 110 is a node having an interface with the broadcast distribution server 100 (CBC).
  • CBC Broadband Center
  • MME Mobility Management Entity
  • RNC Radio Network Controller
  • the control node 110 receives a broadcast information distribution request (e.g. Write-Replace message or Write-Replace Warning Request) from the broadcast delivery server 100.
  • the broadcast transmission information distribution request includes the content of the broadcast transmission information to be distributed to mobile stations (including the communication terminal 200) and designation of a distribution target sector, cell, cell group, or location registration area.
  • the control node 110 determines the base station 120 that should perform cell broadcast, and requests the target base station 120 to broadcast the broadcast information.
  • the base station 120 manages the cell 130 and can perform bidirectional wireless communication with the mobile station using the uplink physical channel and the downlink physical channel.
  • Cell 130 covers road 510.
  • the eNodeB corresponds to the base station 120
  • the NodeB corresponds to the base station 120.
  • the base station 120 performs cell broadcast of the broadcast information in response to reception of the broadcast information distribution request (e.g.gBroadcast Request or Write-Replace Warning Request) from the control node 110.
  • the base station 120 transmits the simultaneous transmission information (e.g. CBS message or ETWS Message) using the broadcast information and the paging message.
  • the broadcast information distribution request e.g.gBroadcast Request or Write-Replace Warning Request
  • Broadcast information including paging information and paging messages are downlink physical channels that can be received by mobile stations (including communication terminal 200) at least in a standby state (ie, RRC_IDLE state of E-UTRAN, CELL_PCH state or URA_PCH state of UTRAN) (Eg E-UTRAN PDSCH, UTRAN P-CCPCH and S-CCPCH).
  • a standby state ie, RRC_IDLE state of E-UTRAN, CELL_PCH state or URA_PCH state of UTRAN
  • the communication terminal 200 has the function of a mobile station that can communicate with the cellular communication system 10 and is configured to receive broadcast information distributed from the base station 120.
  • the communication terminal 200 receives broadcast information at least in a standby state (e.g. E-UTRAN RRC_IDLE state, UTRAN CELL_PCH state, or URA_PCH state).
  • the communication terminal 200 in the standby state cannot transmit and receive user data, and receives a paging channel including a paging message transmitted from the cellular communication system 10.
  • the communication terminal 200 may receive the broadcast information even in a communication state (e.g. E-UTRAN RRC_CONNECTED state or UTRAN CELL_DCH state).
  • EPS and UMTS mobile stations also receive paging signals in the communication state (e.g. E-UTRAN RRC_CONNECTED state or UTRAN CELL_DCH state). Therefore, when the communication terminal 200 has the function of an EPS or UMTS mobile station, the communication terminal 200 can receive broadcast information even in
  • the communication terminal 200 is disposed in an automobile 500 traveling on a road 510.
  • the communication terminal 200 may be an in-vehicle device (e.g. car navigation system) fixedly installed in the automobile 500.
  • Communication terminal 200 may be a portable terminal such as a smartphone or a mobile phone terminal.
  • the communication terminal 200 notifies the user (that is, the passenger of the car 500) of traffic information.
  • the notification of traffic information may be performed by voice, text, image, or a combination thereof. That is, the communication terminal 200 may output voice, text, images, and the like based on traffic information to an output device such as a display or a speaker.
  • the traffic information server 300 is combined with the cellular communication system 10 in order to distribute traffic information as broadcast information.
  • the traffic information server 300 is configured to request the cellular communication system 10 to broadcast a cell broadcast of traffic information into the distribution area.
  • the traffic information server 300 may transmit to the broadcast distribution server 100 indicating the content and distribution area of the traffic information.
  • the traffic information server 300 may determine the content and distribution area of the traffic information.
  • sensor information In order to determine the content and distribution area of the traffic information, sensor information, probe information collected from the automobile 500, or both may be used.
  • the sensor information is information collected by a sensor 520 (e.g. optical sensor for vehicle detection) installed around the road 510.
  • the probe information is information collected from the automobile 500, and includes, for example, position information, acceleration information, speed information, accelerator operation information, or any combination of these.
  • the probe information may be collected by the RSU 530 installed around the road 510 or may be collected via the cellular communication system 10.
  • the information collection system 310 illustrated in FIG. 1 collects sensor information, probe information, and the like from the sensor 520, the RSU 530, or the cellular communication system 10.
  • the traffic information is, for example, traffic jam information, accident information, and safe driving support information.
  • the traffic castle information may be information for guiding the automobile 500 so as to avoid or relieve the traffic jam when the occurrence of the traffic jam is predicted.
  • the traffic information server 300 determines an area including a change point from the downhill to the uphill of the road 510 as a distribution area, and determines the distribution of the traffic information including a message that prompts attention to speed reduction or speed maintenance. May be.
  • the traffic information server 300 determines a region including a junction (eg, interchange, junction) of the road 510 as a distribution area, and distributes traffic information including a message for guiding the car 500 traveling on the road 510 to the overtaking lane. May be determined.
  • the cellular communication system 10 cell-broadcasts traffic information as broadcast information.
  • the broadcast delivery server 100 may determine a sector, cell, cell group, or location registration area corresponding to the delivery area notified from the traffic information server 300 as a delivery destination of the broadcast transmission information (here, traffic information). .
  • FIG. 2 is a sequence diagram illustrating an example of a traffic information distribution procedure according to the present embodiment.
  • the traffic information server 300 determines the content of traffic information to be distributed and its distribution area.
  • the traffic information server 300 transmits a distribution request indicating the traffic information and its distribution area to the cellular communication system 10 (specifically, the broadcast distribution server 100).
  • the cellular communication system 10 determines a sector, a cell, a cell group, or a location registration area where the traffic information is to be distributed in response to the reception of the distribution request from the traffic information server 300.
  • step S104 the cellular communication system 10 broadcasts traffic information as broadcast information to the cell 130.
  • the broadcast delivery in step S104 may be the same as the delivery procedure such as CBS, ETWS, or BC-SMS described in the background art.
  • the cellular communication system 10 may transmit traffic information (e.g. CBS Message or ETWS Message) as broadcast information using broadcast information and a paging signal.
  • traffic information e.g. CBS Message or ETWS Message
  • step S105 the communication terminal 200 receives the traffic information and notifies the passenger of the car 500 of the traffic information.
  • FIG. 3 is a block diagram illustrating a configuration example of the communication terminal 200 according to the present embodiment.
  • the cellular communication unit 201 receives traffic information broadcast from the cellular communication network on a downlink physical channel that can be received by a mobile station in a standby state.
  • the control unit 202 notifies the traffic information to the user (that is, the passenger of the car 500).
  • FIG. 4 is a block diagram illustrating a configuration example of the traffic information server 300 according to the present embodiment.
  • the determination unit 301 determines a traffic information distribution area.
  • the determination part 301 should just determine the delivery area of traffic information based on sensor information or probe information, or both, for example. Furthermore, the determination part 301 may determine the content of traffic information.
  • the communication unit 302 communicates with the broadcast distribution server 100 and transmits a traffic information distribution request to the broadcast distribution server 100.
  • the traffic information distribution system 1 uses a broadcast transmission function for broadcast information included in the cellular communication system 10 (for example, UMTS, EPS, or CDMA2000) to a specific distribution area. Traffic information is distributed to the corresponding sector, cell, cell group, or location registration area.
  • the base station 120 (cell 130) of the cellular communication system 10 generally has a larger coverage than the RSU 530 used in the DSRC ITS spot service. For this reason, the traffic information distribution system 1 can transmit traffic information in a wide range all at once as compared with RSU or the like of ITS spot service.
  • the traffic information distribution system 1 uses a distribution method such as CBS, ETWS, or BC-SMS that can be received by the mobile station in a standby state. For this reason, the communication terminal 200 can receive traffic information without delay. Therefore, according to this embodiment, the latest traffic information can be provided to the passenger without delay.
  • FIG. 5 is a diagram illustrating a configuration example of the cellular communication system 10 according to the present embodiment.
  • the cellular communication system 10 In response to a traffic information distribution request from the traffic information server 300, the cellular communication system 10 according to the present embodiment broadcasts different broadcast transmission information to a plurality of cells or a plurality of cell groups.
  • cellular communication system 10 includes base stations 120A, 120B, and 120C.
  • Base stations 120A, 120B, and 120C manage cells 130A, 130B, and 130C, respectively.
  • the cells 130 ⁇ / b> A, 130 ⁇ / b> B, and 130 ⁇ / b> C are arranged along the road on the road 510 and cover the road 510.
  • the cellular communication system 10 broadcasts a first message (message A) based on traffic information in the cell 130A, and is different from the first message to the cells 130B located around the cell 130A. Broadcast the second message (message B). In addition, the cellular communication system 10 broadcasts a third message (message C) different from the first message to cells 130C located around the cell 130A. Note that the cells 130A, 130B, and 130C may be cell groups or location registration areas including a plurality of cells instead of one cell.
  • the first message may be the traffic information itself requested by the traffic information server 300 for distribution.
  • the second or third message may be urged not to notify the user of the first information corresponding to the traffic information received at the communication terminal 200 via the inter-vehicle communication.
  • This scheme is effective when inter-vehicle communication can be used between the automobiles 500. For example, by transmitting traffic information between vehicles 500 via inter-vehicle communication, the vehicle 500 that does not support the distribution of traffic information via the cellular communication system 10 can also use the traffic information. However, there is a possibility that traffic information may be transmitted to the automobile 500 located outside the cell 130A via inter-vehicle communication.
  • Notifying the passenger of the automobile 500 located outside the cell 130A of this traffic information is not an operation required by the traffic information server 300. Therefore, by requesting the communication terminal 200 located in the cell 130B (or 130C) to suppress notification of traffic information received via inter-vehicle communication, unnecessary traffic information is transmitted to the passenger. Can be prevented.
  • the second or third message may be urged not to transfer the first information corresponding to the traffic information received at the communication terminal 200 via the inter-vehicle communication to the other communication terminal 200. Thereby, it is possible to prevent the traffic information from being transmitted unnecessarily to the range exceeding the cell 130A via the inter-vehicle communication.
  • the first, second, and third messages may indicate different speed limit contents or different driving operations.
  • the first message may instruct the communication terminal 200 located in the cell 130A to run at a low speed (for example, 40 km / h).
  • the second message may instruct relatively high speed travel (for example, 60 km / h) to the communication terminal 200 in the cell 130B located in front of the traffic congestion occurrence point.
  • the third message may instruct normal travel (for example, 100 km / h) to the communication terminal 200 in the cell 130C that is past the place where the traffic congestion has occurred. In this way, it is possible to control in detail the travel of the automobile 500 in the vicinity of the traffic jam occurrence location. This control can be applied not only to traffic jams but also to other traffic obstacles.
  • a configuration example of the traffic information distribution system 1 in the present embodiment may be the same as that in FIG.
  • the communication terminal 200 after receiving the traffic information as the broadcast information, the communication terminal 200 suppresses repeatedly receiving the downlink physical channel for receiving the traffic information.
  • CBS, ETWS, or BC-SMS is used for the distribution of earthquake information
  • the cellular communication system typically needs to distribute the earthquake information only once.
  • the circumstances differ in the distribution of traffic information described in the first embodiment. That is, the cellular communication system 10 needs to continuously broadcast and distribute traffic information as broadcast information while traffic jams, obstacles, weather conditions, and the like notified by the traffic information continue.
  • a normal communication terminal When broadcast information is broadcast continuously, a normal communication terminal repeatedly receives downlink physical channels (eg E-UTRAN PDSCH, UTRAN P-CCPCH and S-CCPCH).
  • downlink physical channels eg E-UTRAN PDSCH, UTRAN P-CCPCH and S-CCPCH.
  • the communication terminal 200 of this embodiment suppresses repeatedly receiving a downlink physical channel for reception of traffic information, it does not repeatedly receive the same traffic information and can reduce power consumption.
  • the communication terminal 200 receives traffic information distributed by cell broadcast (step S201). And the communication terminal 200 suppresses repeatedly receiving a downlink physical channel for reception of traffic information in the same cell, the same cell group, or the same position registration area as the cell which received traffic information. (Step S202).
  • the communication terminal 200 receives traffic information distributed by cell broadcast (step S301). And the communication terminal 200 suppresses receiving a downlink physical channel repeatedly for reception of traffic information within a predetermined period after receiving traffic information (step S302).
  • FIG. 8 is a block diagram illustrating a configuration example of the communication terminal 200 according to the present embodiment.
  • the inter-vehicle communication unit 203 performs wireless communication with other communication terminals arranged in other automobiles 500.
  • the vehicle-to-vehicle communication unit 203 may transfer traffic information received from the cellular communication system 10 via the cellular communication unit 201 to another communication terminal.
  • the inter-vehicle communication unit 203 may receive traffic information from other communication terminals.
  • the traffic information received from the cellular communication system 10 is referred to as “traffic information X”
  • the traffic information transmitted or received via the inter-vehicle communication unit 203 is referred to as “traffic information Y”.
  • the flowchart of FIG. 9 shows an operation example of the communication terminal 200 according to the present embodiment.
  • the communication terminal 200 receives the traffic information Y from other communication terminals by inter-vehicle communication.
  • the communication terminal 200 determines whether or not the traffic information X corresponding to the traffic information Y has been received from the cellular communication system 10.
  • the fact that the traffic information X corresponds to the traffic information Y means, for example, that these two pieces of information have the same content, or belong to the same genre (for example, traffic jam, confluence notice, or weather conditions). If the traffic information X corresponding to the traffic information Y has not been received (NO in step S402), the communication terminal 200 transfers the received traffic information Y to another terminal (step S403). On the other hand, when the traffic information X corresponding to the traffic information Y has been received (YES in step S402), the communication terminal 200 suppresses the transfer of the traffic information Y (step S404).
  • the traffic information Y can prevent the traffic information Y from being propagated indefinitely.
  • the traffic information X received directly from the cellular communication system 10 by the communication terminal 200 may be more reliable than the traffic information Y received by inter-vehicle communication.
  • high-reliability information received via the cellular communication system 10 can be prioritized.
  • the communication terminal 200 may transfer the traffic information X instead of the traffic information Y to another communication terminal.
  • the communication terminal 200 changes the probe information reporting operation in response to receiving traffic information broadcast from the cellular communication system 10.
  • the probe information is information collected from the automobile 500 and includes, for example, position information, acceleration information, speed information, accelerator operation information, or any combination of these.
  • the probe information is collected by, for example, the broadcast distribution server 100, the traffic information server 300, the information collection system 310, or other devices.
  • the communication terminal 200 may transmit probe information via the cellular communication system 10, or may transmit probe information via an RSU such as an ITS spot installed in the vicinity of the road 510.
  • the change of the probe information reporting operation by the communication terminal 200 includes, for example, (a) starting the reporting of probe information, (b) stopping the reporting of probe information, and (c) changing the reporting period of probe information. Including at least one of the following.
  • the communication terminal 200 starts the probe information reporting operation or shortens the reporting cycle, so that the traffic information server 300 or the information collection system 310 notifies the traffic information. It is possible to verify the effect of avoiding or mitigating traffic jams.
  • the traffic information server 300 monitors the probe information, and when the traffic information notification effect is not sufficient, the traffic information content is changed, or the traffic information notification method is changed by the communication terminal 200 (for example, a warning sound is changed). May be performed.
  • FIG. 10 is a block diagram illustrating a configuration example of the communication terminal 200 according to the present embodiment.
  • the probe information report unit 204 shown in FIG. 10 transmits probe information via the cellular communication system 10.
  • the control unit 202 controls the probe information reporting operation by the probe information reporting unit 204 in response to reception of traffic information.
  • the flowchart of FIG. 11 shows an operation example of the communication terminal 200 according to the present embodiment.
  • the communication terminal 200 receives traffic information distributed by cell broadcast.
  • the communication terminal 200 changes the probe information reporting operation in response to receiving the traffic information.
  • a configuration example of the traffic information distribution system 1 in the present embodiment may be the same as that in FIG.
  • the communication terminal 200 has traffic information (referred to as traffic information X) via the cellular communication system 10 and other traffic information (referred to as traffic information Z) via the RSU 530 installed around the road 510.
  • traffic information X traffic information
  • traffic information Z traffic information
  • the communication terminal 200 may notify the passenger of only one of the two pieces of traffic information X and Z having a higher priority. If a plurality of similar traffic information is notified or different traffic information is notified, it becomes a factor to confuse the passenger. According to the priority control of the present embodiment, these situations that cause confusion to the passenger can be avoided.
  • the communication terminal 200 when high reliability is set for the traffic information Z via RSU, the communication terminal 200 notifies the user of the traffic information Z preferentially when both the traffic information X and Z are received. May be.
  • the communication terminal 200 when high reliability is set for the traffic information X via the cellular communication system 10, the communication terminal 200 gives priority to the traffic information X when both the traffic information X and Z are received. The user may be notified.
  • FIG. 12 is a block diagram illustrating a configuration example of the communication terminal 200 according to the present embodiment.
  • the DSRC communication unit 205 shown in FIG. 12 communicates with the RSU 530 by the DSRC method.
  • the DSRC communication unit 205 sends the traffic information Z received from the RSU 530 to the control unit 202.
  • the control unit 202 shown in FIG. 12 prioritizes the two pieces of traffic information X and Z, and controls traffic information notification to the passenger.
  • FIG. 13 is a diagram illustrating a configuration example of the cellular communication system 10 according to the present embodiment.
  • the communication terminal 200 is configured to transmit an acknowledgment indicating the reception status of traffic information broadcasted by the cell to the cellular communication system 10. More preferably, the communication terminal 200 is in a standby state (eg RRC_IDLE state of the ERC-UTRAN or UTRAN CELL_DCH state) (e.g.
  • RRC_IDLE state of the ETRAN-UTRAN), UTRAN The CELL_PCH state or the URA_PCH state) can be transmitted to the cellular communication system 10 with an acknowledgment indicating the traffic information reception status.
  • the cellular communication system 10 is configured to receive confirmation responses indicating the traffic information reception status from a plurality of communication terminals 200.
  • the communication terminal 200 sends a confirmation response using a signaling message terminated in the access layer (Access Stratum).
  • the signaling message terminated in the access layer (Access Stratum) is a signaling message used in the Access Stratum protocol.
  • the Access Stratum protocol is a protocol that handles signals terminated by nodes in a radio access network (i.e. UTRAN or E-UTRAN), i.e., eNodeB, NodeB, or RNC.
  • the Access-Stratum protocol includes RRC (Radio Resource Control), RLC (Radio Link Control), and MAC (Medium Access Control).
  • the communication terminal 200 may transmit an acknowledgment using an RRC signaling message (RRC message) that is a layer 3 control plane (C plane) protocol.
  • RRC message an RRC signaling message
  • C plane control plane
  • the acknowledgment is received by the node that terminates the RRC in the cellular communication system 10. That is, in the case of E-UTRAN, the base station (eNodeB) 120 receives the confirmation response transmitted using the RRC message.
  • the control node (RNC) 110 receives the confirmation response transmitted using the RRC message.
  • the UTRAN base station (NodeB) 120 may receive an acknowledgment by monitoring the RRC message.
  • the standby state corresponds to the RRC_IDLE state.
  • the communication terminal 200 in the RRC_IDLE state transmits an acknowledgment without changing to the communication state (RRC_CONNECTED state), in other words, without setting an RRC (Radio Resource Control) connection with the cellular communication system 10.
  • the communication terminal 200 transmits the transport channel UL-SCH (Uplink Shared Channel) transmitted in the physical channel PUSCH (Physical Uplink Shared Channel) in the same manner as the RRC Connection Request message sent to request the RRC connection.
  • the confirmation response may be transmitted to the base station (eNodeB) 120 using the logical channel CCCH (Common Control Channel).
  • the standby state corresponds to the CELL_DCH state or the CELL_FACH state.
  • the communication terminal 200 in the CELL_DCH state or the CELL_FACH state does not change to the communication state (CELL_DCH state), in other words, assigns uplink dedicated physical channels (DPDCH (Dedicated Physical Data Channel)) and DPCCH (Dedicated Physical Control Channel). Send an acknowledgment without receiving it.
  • the communication terminal 200 uses a transport channel RACH (Random Access Channel) and a logical channel CCCH (Common Control Channel) transmitted in the physical channel PRACH (Physical Random Access Channel) to establish a base station (Node B) 120.
  • the confirmation response may be transmitted to the control node (RNC) 110 via the route.
  • RACH Random Access Channel
  • CCCH Common Control Channel
  • the node (base station 120 or control node 110) in the cellular communication system 10 that has received the confirmation response from the communication terminal 200 is a higher-order node (control node 110 or broadcast distribution server 100) on the traffic information distribution route.
  • a confirmation response from the communication terminal 200 may be transferred.
  • the confirmation responses from the communication terminal 200 may be transferred individually as they are, or may be transferred as appropriate at each node.
  • each communication terminal 200 receives cell-traffic traffic information while in a standby state (eg, E-UTRAN RRC_IDLE state, UTRAN CELL_PCH state, or URA_PCH state).
  • a standby state eg, E-UTRAN RRC_IDLE state, UTRAN CELL_PCH state, or URA_PCH state.
  • An acknowledgment indicating the situation is transmitted to the cellular communication system 10.
  • the cellular communication system 10 receives confirmation responses indicating the traffic information reception status from the plurality of communication terminals 200 in the standby state. Therefore, the communication terminal 200 does not need to transition to a communication state in which user data can be transmitted / received.
  • signaling for state transition of the communication terminal 200 does not occur frequently between the nodes (base station, MME, RNC, S-GW, SGSN, etc.) arranged in the cellular communication system 10 and the communication terminal 200. .
  • the preferable example of this embodiment can perform efficiently transmission of the confirmation response by the communication terminal 200 with respect to the traffic information cell-broadcasted from the cellular communication system 10, suppressing the load increase of the cellular communication system 10. .
  • FIG. 14 is a sequence diagram showing a specific example when the cellular communication system 10 is an EPS.
  • the communication terminal 200 is in a standby state (RRC_IDLE state), and periodically and intermittently receives a paging signal.
  • traffic information (ETWS Message) is broadcast from the cellular communication system to the communication terminal 200.
  • the broadcast delivery in step S602 may be the same as the delivery procedure described in the background art (FIG. 19).
  • emergency information (ETWS) is used by using broadcast information and a paging signal. Message) may be transmitted. Therefore, the detailed description regarding the broadcast distribution procedure of traffic information is omitted here.
  • the communication terminal 200 transmits a confirmation response (Ack send Request) regarding the reception status of the traffic information to the base station (eNodeB) 120 while remaining in the standby state.
  • the confirmation response is transmitted using the RRC message.
  • the example of FIG. 14 illustrates a case where the confirmation response is ACK indicating normal reception of traffic information.
  • the confirmation response (Ack send Request) includes an identifier (message ID) that can identify the traffic information received by the communication terminal 200, an identifier of the communication terminal 200 of the transmission source (for example, IMSI (International Mobile Subscriber Identity), IMEI ( International Mobile Equipment Identity), TMSI (Temporary Mobile Subscriber Identity), or M-TMSI (MME-TMSI)).
  • IMSI International Mobile Subscriber Identity
  • IMEI International Mobile Equipment Identity
  • TMSI Temporary Mobile Subscriber Identity
  • MME-TMSI MME-TMSI
  • step S604 a response indicating that the base station 120 has received the confirmation response is transmitted to the communication terminal 200.
  • the response transmission in step S604 may be omitted.
  • step S605 the base station 120 aggregates the plurality of confirmation responses received from the plurality of communication terminals 200, and displays the confirmation response report (Ack Report) edited so as to integrate the confirmation responses from the plurality of communication terminals 200. create.
  • step S606 the base station 120 transmits an acknowledgment report to the control node (MME) 110.
  • the confirmation response report includes an identifier (message ID) that can specify traffic information and an identifier list (for example, a TMSI list) of a plurality of communication terminals 200 that are transmission sources of the confirmation response corresponding to the message ID.
  • the transmission of the confirmation report in step S606 may be performed using a control interface (e.g. S1-MME interface) that can be used between the base station (eNodeB) 120 and the control node (MME) 110.
  • a control interface e.g. S1-MME interface
  • step S607 the control node (MME) 110 receives an acknowledgment report from each of the plurality of base stations 120. Then, the control node 110 further aggregates the received plurality of confirmation response reports, creates an acknowledgment report edited so as to integrate the reports from the plurality of base stations 120, and transmits the confirmation response report to the broadcast distribution server (CBC). ) 100 (step S608).
  • CBC broadcast distribution server
  • FIG. 15 is a sequence diagram showing an example of a procedure for collecting confirmation responses when the cellular communication system 10 is UMTS.
  • the communication terminal 200 is in a standby state (CELL_PCH state or URA_PCH state), and periodically and intermittently receives a paging signal.
  • traffic information (CBS message) is broadcast from the cellular communication system 10 to the communication terminal 200.
  • the broadcast delivery in step S702 may be performed in the same manner as the delivery procedure described in the background art (FIG. 18), and traffic information (CBS ⁇ Message using the broadcast information and the paging signal as described in the first embodiment). ). Therefore, the detailed description regarding the broadcast distribution procedure of traffic information is omitted here.
  • step S703 the communication terminal 200 transmits a confirmation response (Ack send Request) regarding the reception status of the traffic information to the control node (RNC) 110 while remaining in the standby state.
  • the confirmation response is transmitted using the RRC message.
  • the example of FIG. 15 shows a case where the confirmation response is ACK indicating normal reception of traffic information.
  • the acknowledgment (Ack send Request) includes an identifier (message ID) that can identify traffic information and an identifier of the communication terminal 200 of the transmission source (for example, IMSI, IMEI, TMSI, or P-TMSI (Packet TMSI)). .
  • step S704 a response indicating that the control node 110 has received the confirmation response is transmitted to the communication terminal 200.
  • the response transmission in step S704 may be omitted.
  • step S705 the control node 110 aggregates the plurality of confirmation responses received from the plurality of communication terminals 200, and outputs the confirmation response report (Ack Report) edited so as to integrate the confirmation responses from the plurality of communication terminals 200. create.
  • step S706 the control node 110 transmits an acknowledgment report to the broadcast distribution server (CBC) 100.
  • the confirmation response report includes an identifier (message ID) that can specify traffic information and an identifier list (for example, a TMSI list) of a plurality of communication terminals 200 that are transmission sources of the confirmation response corresponding to the message ID.
  • the cellular communication system 10 or the traffic information server 300 changes the traffic information distribution method according to the reception status of confirmation responses from the plurality of communication terminals 200. For example, (a) distribution of traffic information using an intelligent transportation system (ITS) including an RSU 530 installed around the road 510, and (b) inter-vehicle communication of the communication terminal 200. Transferring traffic information to other communication terminals using the function, and (c) changing the upper limit of the number of hops when transferring traffic information to other communication terminals by the inter-vehicle communication function of the communication terminal 200, Including at least one.
  • ITS intelligent transportation system
  • RSU 530 installed around the road 510
  • inter-vehicle communication of the communication terminal 200 Transferring traffic information to other communication terminals using the function, and (c) changing the upper limit of the number of hops when transferring traffic information to other communication terminals by the inter-vehicle communication function of the communication terminal 200, Including at least one.
  • the cellular communication system 10 or the traffic information server 300 when the number of confirmation responses received is equal to or less than the threshold, other distribution methods, for example, distribution from the RSU 530 or other distribution using the inter-vehicle communication function , May be used.
  • the cellular communication system 10 or the traffic information server 300 may increase the upper limit of the number of hops in the inter-vehicle communication when the number of confirmation responses received is equal to or less than the threshold. According to these methods, traffic information can be transmitted to the automobile 500 (communication terminal 200) using other communication means in a situation where distribution of traffic information by cell broadcast is not sufficiently functioning.
  • FIG. 16 is a block diagram showing a configuration example of the traffic information server 300 that can change the traffic information distribution method.
  • the determination unit 301 illustrated in FIG. 16 receives the confirmation response report collected by the cellular communication system 10 via the communication unit 302.
  • the confirmation response report indicates the reception status of the traffic information subjected to cellular communication by the plurality of communication terminals 200.
  • the determination unit 301 changes the traffic information distribution method as necessary based on the confirmation response report.
  • the cellular communication system 10 is EPS, UMTS, or CDMA2000.
  • the application destinations of the first to seventh embodiments are not limited to EPS, UMTS, and CDMA2000 cellular communication systems. That is, the first to seventh embodiments can be widely applied to cellular communication systems in which traffic information is distributed by cell broadcast to a plurality of mobile stations.
  • the broadcast distribution server 100, the control node 110, the base station 120, the communication terminal 200, or the traffic information server 300 related to the broadcast distribution of traffic information described in the first to seventh embodiments includes at least one process. It may be realized by causing a computer system including a processor (eg, microprocessor, MPU (Micro Processing Unit), DSP (Digital Signal Processor)) to execute a program. Specifically, one or a plurality of programs including an instruction group for causing a computer system to execute an algorithm described using a flowchart, a sequence diagram, and the like may be created, and the programs may be supplied to the computer.
  • a processor eg, microprocessor, MPU (Micro Processing Unit), DSP (Digital Signal Processor)
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
  • the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • Traffic information delivery system 10 Cellular communication system 100 Broadcast delivery server 110 Control node 120 Base station 130 Cell 200 Communication terminal 300 Traffic information server 310 Information collection system 500 Car 510 Road 520 Roadside sensor 530 RSU (Road-Side Unit)

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)

Abstract

L'invention concerne un réseau de communication cellulaire (10) qui est configuré pour réaliser une distribution de diffusion d'informations de transmission simultanée à l'aide d'un canal physique de liaison descendante, lesquelles informations peuvent être reçues par une pluralité de stations mobiles dans un état de veille. Un serveur d'informations de trafic (300) demande au réseau de communication cellulaire (10) de réaliser une distribution de diffusion d'informations de trafic vers une zone de distribution. Un terminal de communication (200) monté dans une automobile (500) reçoit, par l'intermédiaire du réseau de communication cellulaire (10), des informations de trafic distribuées en tant qu'informations de transmission simultanée. Ceci permet, par exemple, de fournir les dernières informations de trafic au passager de l'automobile (500) sans retard.
PCT/JP2013/005445 2012-10-15 2013-09-13 Système de distribution d'informations de trafic, système de communication cellulaire, terminal de communication et serveur d'informations de trafic WO2014061198A1 (fr)

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