WO2013179397A1 - 無線通信装置 - Google Patents
無線通信装置 Download PDFInfo
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- WO2013179397A1 WO2013179397A1 PCT/JP2012/063803 JP2012063803W WO2013179397A1 WO 2013179397 A1 WO2013179397 A1 WO 2013179397A1 JP 2012063803 W JP2012063803 W JP 2012063803W WO 2013179397 A1 WO2013179397 A1 WO 2013179397A1
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- WIPO (PCT)
- Prior art keywords
- wireless communication
- channel
- interference
- current position
- radar
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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
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
- H04W40/16—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality based on interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- 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]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
Definitions
- the present invention relates to a wireless communication device that is assumed to be used while moving.
- a wireless communication device used in an automobile there are a hands-free device, a music player, and the like that are wirelessly connected to a mobile phone by Bluetooth (registered trademark).
- Bluetooth registered trademark
- in-vehicle devices incorporating functions as hands-free devices and music player devices such as car navigation devices and in-vehicle audio devices are widespread (see Non-Patent Document 1).
- Wireless LAN Local Area Network
- Wi-Fi registered trademark
- a communication form using a wireless LAN is widely used as a communication between many devices such as a personal computer, a portable game machine, and a smart phone in the public, a company, a home, and the like.
- Wireless communication systems that employ wireless LANs have been developed on the premise that they are used in indoor and outdoor stationary environments. If a wireless communication system is introduced, it is possible to provide a wireless Internet connection service to a contractor or a user at a station or a store, and to communicate from anywhere in the home or at home. In particular, in the case of homes, the introduction of wireless communication relay stations such as wireless LAN routers tends to increase with the spread of personal computers, portable game machines, smartphones and the like equipped with wireless LAN communication functions.
- Patent Documents 1 and 2 disclose a method for setting a Bluetooth FH (frequency hopping) channel so as not to disturb each other's communication in consideration of the mutual channel quality of Bluetooth and wireless LAN. .
- Patent Document 3 discloses a technique for avoiding interference in the 2.4 GHz band, which is generally widespread.
- interference may occur at the timing determined based on the GPS function and position information.
- the wireless LAN channel to be used is changed.
- mutual interference may occur when a wireless LAN using the 2.4 GHz band and Bluetooth are used in combination.
- a radar system using the 5 GHz band as a system that is concerned about interference with the wireless LAN.
- a weather radar device observes the state of rain or clouds by emitting radio waves from an antenna and receiving radio waves reflected by rain or clouds, so it has a very sensitive receiver.
- aviation radars, military radars, and the like have highly sensitive receivers.
- a communication channel such as a wireless LAN system uses a communication channel including the frequency of a radar wave generated by the radar, interference with a radar device, particularly a receiver, can be considered.
- DFS Dynamic Frequency Selection
- TPC Transmitter Power Control
- pre-operation monitoring checks the presence of radar waves by monitoring the channel for 60 seconds without performing transmission before opening the network.
- radar waves are continuously monitored while communicating, and if a radar wave is detected, within the channel eviction time (Channel Move Time) (10 seconds)
- the transmission on the channel is completely stopped (communication is stopped), or the communication is continued by switching to another channel without interference. Note that communication cannot be performed for 30 minutes or more in the channel where the radar wave is detected.
- a search takes time because another frequency channel without interference is searched and moved.
- Bluetooth “Specification of Bluetooth System Covered Core Package Version: 3.0 + HS”, 21 April 2009. IEEE, “IEEE Std IEEE802.11-2012”
- the DFS function, the TPC function, and the method described in Patent Document 4 related to a wireless LAN using the 5 GHz band described above have been developed on the premise that they are used in an indoor and outdoor stationary environment. Therefore, a problem occurs when these functions and methods are applied to communication in a mobile environment. For example, when a 5 GHz band wireless LAN is used in a moving body such as an automobile, depending on the destination of the automobile, there is a possibility of causing interference with weather radar, military radar, aviation radar, etc. that use the same frequency band.
- the radio channel in the car and the radio channel transmitted and received by the airport radar station within the radio wave reach are If they match or if the channel widths partially overlap, both or one of the wireless communications is affected by interference.
- the same problem is likely to occur not only at airports, but also on hills that can see the airport, military bases, and places where weather radars are installed, when vehicles are approaching buildings and sites that use radar. Therefore, when the base station of the wireless LAN is fixed, by performing the DFS function at the time of setting up the base station, communication that avoids interference with radar waves is possible thereafter, but the base station moves.
- Patent Document 3 is for avoiding interference with other wireless LAN systems that use the same frequency band (2.4 GHz band), and receives a broadcast signal such as Beacon relatively easily, and is capable of mutual interference.
- the wireless LAN is detected.
- the present invention has been made in view of the above, and is a radio that can reduce interference with other systems such as radars that use the same frequency band when mounted on a moving body such as an automobile.
- An object is to obtain a communication device.
- the present invention provides communication means capable of wireless communication using at least a 5 GHz band, current position detection means for detecting the current position of the device itself, and the communication means. Detected by other system data, which is information about the reach of radio waves transmitted from other systems that transmit and receive radio waves in a stationary state, map data, and the current position detecting means when using the 5 GHz band Based on the current position determined, it is determined whether or not switching of the channel used by the communication means is necessary, and when switching of the channel is necessary, the switching destination channel is further selected by itself or Channel switching control means for causing the communication means to select.
- the wireless communication apparatus can realize interference avoidance and interference reduction with other systems, and shorten the communication interruption time when switching channels for avoiding interference.
- FIG. 1 is a diagram illustrating a configuration example of an in-vehicle terminal as a wireless communication device.
- FIG. 2 is a diagram illustrating an example of a communication environment of the in-vehicle terminal.
- FIG. 3A is a diagram illustrating an example of interference data.
- FIG. 3B is a diagram illustrating an example of interference data.
- FIG. 4 is a diagram illustrating an example of route guidance performed in cooperation between the in-vehicle terminal and the car navigation system.
- FIG. 5 is a diagram illustrating an operation example of the in-vehicle terminal.
- FIG. 6 is a flowchart illustrating an example of a channel switching operation procedure in the in-vehicle terminal.
- FIG. 1 is a diagram illustrating a configuration example of an in-vehicle terminal according to the present embodiment.
- the in-vehicle terminal 1 includes a current position detection unit 11, a vehicle speed detection unit 12 that detects a moving speed of the own terminal (the speed of the vehicle on which the in-vehicle terminal 1 is mounted), A wireless communication area prediction unit 15 that predicts the overlapping state of the wireless communication area of the terminal itself and the wireless communication area of the device of another system, a wireless communication unit 16 that uses at least the 5 GHz band, and a mobile phone (3G, LTE) or WiMax A wide area wireless communication unit 17 that performs wide area wireless communication using PHS or the like.
- the wireless communication area prediction unit 15 uses the interference data 13 held internally (in-vehicle terminal 1) or the interference data 13 held outside and the map data 14 held inside, Predict the system's radio range.
- the wireless communication area indicates an area where the power level of a radio wave transmitted from a communication device of another system is a certain value or more.
- the wireless communication area is an area where there is a high possibility of mutual interference with other systems when communication is performed within this area.
- Interference data 13 held in an external network that is, interference data 13 held, for example, in a database server 19 on the Internet 18 is acquired by the wide-area wireless communication unit 17 transmitting and receiving radio waves 5.
- the wide area wireless communication unit 17 is not limited to an interface such as 3G, LTE, WiMax, and PHS, but is connected to a mobile phone or the like via USB, a Bluetooth DUN (Dial-Up Network) profile, or a PAN (Personal Area).
- a networking) profile or the like may be used to connect to a wide area network, or a Wi-Fi tethering or the like may be used. This embodiment does not limit the realization method of the wide area wireless communication unit.
- the radio communication range prediction unit 15 that operates as a channel switching control unit has a current position, map data 14, and interference data 13 (details will be described later) detected by the current position detection unit 11 at a predetermined timing. ) To check whether there is a system that uses 5 GHz band radio waves in the vicinity, specifically, whether there is a system that receives interference when the wireless communication unit 16 transmits 5 GHz band radio waves. To do.
- the presence / absence of a system receiving interference is determined in consideration of the speed by the vehicle speed detection unit 12 and the traveling direction calculated based on the detection result history by the current position detection unit 11. You may make it do.
- the wireless communication unit 16 is instructed not to transmit radio waves that interfere with the detected system.
- the wireless communication unit 16 stops communication using the 5 GHz band (when receiving an instruction before starting communication, communication is not started).
- a frequency channel that does not interfere with the system detected by the wireless communication range prediction unit 15 can be used, such as when communication using a band other than the 5 GHz band is possible, the frequency channel that does not cause interference is switched to use.
- the wireless communication unit 16 When receiving the above instruction, the wireless communication unit 16 first performs monitoring to check whether a system that receives interference from its own communication exists, and confirms that it exists. In addition, the communication may be stopped or the frequency channel may be switched. When monitoring is performed, communication may be stopped even if there is no system that receives interference, or frequency channels may be switched, etc., causing unnecessary throughput degradation or transmission delay. Can be prevented. Further, when communication is not performed, the wireless communication unit 16 monitors a system using the 5 GHz band at a predetermined timing (that is, monitors a 5 GHz band radio wave transmitted from another system). Monitoring is also performed when an instruction is received from the wireless communication area prediction unit 15.
- the wireless communication area prediction unit 15 receives the interference information from the wireless communication unit 16, the wireless communication range prediction unit 15 registers the interference information 13 together with the current position and current time information.
- the in-vehicle terminal 1 monitors whether there is another system that receives interference when communication is performed using the 5 GHz band based on the current position, the map data 14, the interference data 13, and the like. At the same time, monitoring is actually performed at a predetermined timing, and when another system using the 5 GHz band is detected, information on the detected system is collected and the interference data 13 is updated. Further, when there is another system that receives interference, communication using a frequency channel that causes interference is not performed. As a result, interference with other systems (such as weather radar, aviation radar, and military radar) using the 5 GHz band is reduced. The monitoring of other systems may be executed only during movement.
- other systems such as weather radar, aviation radar, and military radar
- the processing load and power consumption can be reduced.
- the frequency (cycle) of executing monitoring may be changed as appropriate according to the moving speed. For example, the execution frequency is increased during high-speed movement, and the execution frequency is decreased during low-speed movement. Even in this case, the processing load and power consumption can be reduced.
- FIG. 2 is a diagram illustrating an example of a communication environment of the in-vehicle terminal 1.
- the same components as those shown in FIG. the present embodiment assumes a case where the vehicle-mounted terminal 1 is mounted on the vehicle 3.
- the in-vehicle terminal 1 transmits / receives a radio wave 4 to / from other in-vehicle communication devices 2-1 and 2-2 and communicates with these terminals.
- the in-vehicle terminal 1 and other terminals (in-vehicle communication devices 2-1 and 2-2) communicate with each other using a wireless LAN of 5 GHz band.
- the current position detection unit 11 uses, for example, a GPS (Global Positioning System) receiver (not shown) mounted on the vehicle 3 or a GPS receiver (not shown) included in itself (the in-vehicle terminal 1). , Collect information on its current position (latitude and longitude coordinates and altitude). The collected current position information is passed to the wireless communication area prediction unit 15. In addition, you may substitute the position of the vehicle 3 as own position.
- the method of collecting the position information is not limited to this, and other methods such as a method of acquiring from the outside by communication may be used. In that case, you may acquire via the wide area radio
- the vehicle speed detection unit 12 detects the speed of the vehicle 3 as the moving speed of the in-vehicle terminal, and passes speed information indicating the detected speed to the wireless communication area prediction unit 15.
- the interference data 13 which is other system data, uses the 5 GHz band in the same manner as the wireless communication unit 16 of the in-vehicle terminal 1, and is another system (for example, weather radar, military, etc.) that receives interference when the wireless communication unit 16 performs communication. Radar, aviation radar, etc.) (see FIGS. 3A and 3B).
- the interference data 13 includes the radar position (including coordinates, height, elevation angle, etc.), time, and search direction of other systems. Information such as the radar search period (the time when the radar searches for an object, the direction in which the radar searches, the execution period), the frequency band, the frequency bandwidth, and the like are included.
- the interference data 13 may be stored in advance in a storage device in the in-vehicle terminal 1 or may be acquired from the outside by communication. When acquiring from the outside, you may acquire via the wide area radio
- the map data 14 is map information used in a car navigation device or the like.
- the map data 14 includes, for example, a building position (latitude / longitude coordinates), a building name, a building type, a building height, a building area, and the like.
- the map data 14 may be stored in advance in a storage device in the in-vehicle terminal 1 or may be acquired from the outside by communication. Furthermore, data stored in advance and data acquired from the outside may be used in combination.
- the map data 14 is used in the detection operation of another system by the wireless communication area prediction unit 15. In the detection operation of another system using the map data 14, for example, if keywords such as “airport” and “base” are included in the names of buildings around the current position, it is determined that radar is present in the vicinity.
- the in-vehicle terminal 1 and a device having a route guidance function such as a car navigation system it is necessary to stop using the 5 GHz band wireless LAN used in the vehicle in order to avoid interference with other systems. It is possible to set a route in advance so as not to be present (see FIG. 4). That is, the in-vehicle terminal 1 identifies an area where interference with surrounding radar occurs based on the interference data 13 and the like, and the route guidance function identifies the area identified by the in-vehicle terminal 1 (area where interference occurs). A guide route is determined so as to avoid traveling. Note that the in-vehicle terminal 1 identifies an area where interference with the radar occurs within a certain range with the current position as a reference. The route guidance performed so as to avoid the area specified based on the interference data 13 will be described separately.
- the wireless communication area prediction unit 15 determines whether the wireless communication area of the other system overlaps with its own wireless communication area based on the current position, moving direction, interference data 13 and the like of itself (the in-vehicle terminal 1 or the vehicle 3) (interference Whether or not there is a possibility of occurrence of
- radar wave detection / search is performed. Radar wave detection / search is performed using the wireless communication unit 16. Radar wave detection is performed over a certain period of time. For example, it is assumed that the execution period of the operation in which the radar radiates radio waves to search for an object is multiplied by a certain value (an integer greater than or equal to 1). The execution cycle is one piece of information registered in the interference data 13.
- the wireless communication unit 16 detects information (interference data) related to the detected radar wireless communication area. 13). The collected information is transferred to the wireless communication area prediction unit 15, and the wireless communication area prediction unit 15 registers the information collected by the wireless communication unit 16 in the interference data 13. At this time, the radar position calculated based on the map data 14 and the current position is also registered. It is also desirable to register information on the shielding such as buildings existing around the current position. For example, when traveling in a tunnel or when a large-scale commercial facility exists between the radar and itself, even if it is within the radar wave reach, its communication will not interfere with the radar.
- the wireless communication area prediction unit 15 determines whether or not it is within the operation time of the radar based on the presence / absence of overlap of the wireless communication areas, based on the current time, the radar search period held in the interference data 13, and the like. Also good. In this case, for example, for a radar used in a low cycle, if it is outside the radar operation time, a radar wave search is performed to confirm that the radar is not operated, and then 5 GHz by the wireless communication unit 16 Communication using a band can be performed.
- the wireless communication unit 16 is a wireless LAN communication device using a 5 GHz band such as IEEE802.11a / n / ac, and performs wireless communication with the wireless communication terminals 2-1 and 2-2 in the vehicle 3.
- a 5 GHz band such as IEEE802.11a / n / ac
- Interference detection processing is performed to investigate whether communication is interfering.
- the radio communication unit 16 detects interference
- the radio communication unit 16 notifies the radio communication area prediction unit 15 of information such as the interfered frequency channel information and the received power value from the interference source as interference information.
- the wireless communication area prediction unit 15 registers the interference information acquired from the wireless communication unit 16 in the interference data 13.
- the acquired interference information is stored in the interference data 13 when the installation position of the radar that may cause interference is known in advance or when a new interference source that is not registered in the interference data 13 is detected. Since registration is performed, it is possible to determine whether or not the own wireless communication interferes with another system at the current position.
- the wireless communication unit 16 periodically checks whether other systems using the same frequency band exist in the vicinity even during communication using the 5 GHz band. As a result of the confirmation, if another radio communication system (radar) is detected, the communication on the current frequency channel is stopped according to the procedure of the conventional DFS function, and the frequency channel without the interference is moved or the destination frequency is If there is no channel, communication is stopped. At this time, referring to the interference data 13, if clear channel data exists, the frequency channel indicated by the clear channel data is selected as the movement destination. Even in the destination frequency channel, the operation of confirming whether or not another system using the same frequency band exists in the vicinity is continued.
- radar radio communication system
- 3A and 3B are diagrams illustrating an example of the interference data 13.
- information included in the interference data 13 includes, for example, “installation position”, “detection position / detection coordinates”, “type”, “detection / update date / time”, “frequency band”, and “allowable signal strength”. , “Received power value”, “signal output”, “reach distance”, “cycle / direction”, “clear channel list / priority”.
- the information included in the interference data 13 is not limited to these. Any information may be included as long as it is possible to determine whether or not there is a possibility of interference with another system using the 5 GHz band at the current position of the in-vehicle terminal 1. It is sufficient that at least information capable of specifying the radio communication area of the radar of another system is included.
- “Installation position” indicates the installation position of the radar station that is the interference source. This information is acquired and held in advance by a predetermined method. For example, the radar installation position is acquired based on the map data 14. “Detected position / detected coordinate” indicates a position where the vehicle 3 (own vehicle) or another vehicle detects the radar station. “Type” indicates the type of radar (aviation radar, military radar, weather radar, etc.).
- Detection / update date and time is the date and time when a radar station was newly detected and information related to the radar station was registered, or a radar station that was detected in the past (a radar station that has already registered information in the interference data 13) Is detected, and the date and time when the registered information related to the re-detected radar station is updated is shown.
- Frequency band indicates the frequency band and bandwidth used by the radar station.
- Allowable signal strength indicates the amount of signal power that the radar station determines as mutual interference. When the radar station receives a signal exceeding the allowable signal strength, it determines that mutual interference has occurred.
- Receiveived power value indicates the received power amount of the radar wave.
- Signal output indicates the transmission output of a radar wave.
- “Reach distance” indicates the reach distance of the radar wave. By using this reachable distance and the above-described installation position information, it is possible to grasp the radio communication area that is the reach of the radar wave.
- “Period / Direction” indicates a radar operation cycle (cycle in which radar waves are transmitted) and directivity during operation (direction in which radar waves are transmitted).
- “Clear channel list / priority” indicates a radio frequency band that does not interfere with radar waves from a radar station (a list of clear channels that are non-interfering channels) and the use priority of each clear channel. For example, the usage priority is determined such that the lower the noise power received by the channel (frequency), the higher the usage priority. Note that the interference data 13 may include other information.
- FIG. 3A shows an example of interference data 13 in which only information created in advance based on the establishment status of the wireless station is registered.
- FIG. 3B shows an example of interference data 13 in which information created in advance based on the establishment status of the wireless station and the information collected by the in-vehicle terminal 1 are registered.
- the interference data 13 shown in FIG. 3B is obtained by collecting and additionally registering information on the detected radar station each time the in-vehicle terminal 1 detects the radar station.
- the wireless communication unit 16 receives a radar station detection operation execution instruction from the wireless communication area prediction unit 15 or uses the radar station autonomously at a predetermined timing. Explore.
- the radio communication unit 16 detects a radar station
- the radio communication unit 16 further collects information about the detected radar station (information registered in the interference data 13).
- the collected information is passed to the wireless communication area prediction unit 15.
- the wireless communication area prediction unit 15 registers the received information in the interference data 13.
- the received information is the latest information on the radar station detected in the past at the same position. In this case, the information registered when the radar station is detected in the past is overwritten and registered.
- the radio communication unit 16 when collecting information on the detected radar station, a channel that does not cause mutual interference is also searched, and if a channel that does not cause mutual interference is detected, the detected channel is cleared. It may be registered in the channel list.
- a plurality of radar stations are detected in the search by the wireless communication unit 16, they may be registered as one record or may be registered as individual records.
- the interference data 13 is stored in the database server 19 on the Internet 18 via the broadband wireless communication unit 17 or the wireless communication unit 16 of the in-vehicle terminal 1, and another vehicle (an in-vehicle terminal of another vehicle). May be made available.
- unregistered radar station detection information is information on a newly detected radar station.
- FIG. 4 is a diagram illustrating an example of route guidance performed in cooperation between the in-vehicle terminal 1 and a car navigation system.
- a route guidance result 56 that minimizes distance, time, fuel consumption and the like while avoiding mutual interference between the wireless communication areas 54A, 54B and 55C and the wireless communication area 57 is shown.
- the conventional route guidance result 55 takes into account the route guidance result performed without cooperation with the in-vehicle terminal 1, that is, the interference between the radio wave transmitted by the wireless communication unit 16 of the in-vehicle terminal 1 and the radio wave transmitted by another system. It is the route guidance result that went without.
- the radar station passes through the wireless communication areas 54A and 54B, and the in-vehicle terminal 1 provided in the vehicle 3
- the communication area 57 and the wireless communication areas of the other systems overlap, it is necessary to cancel communication.
- the in-vehicle terminal 1 performs wireless communication area prediction (prediction of the wireless communication area of another system based on the interference data 13) and wireless communication of each radar station.
- the zones 54A, 54B and 54C are detected, and the route guidance result 56 is derived in consideration of the detection results. Therefore, by traveling according to the route guidance result 56, it becomes possible to continuously use the wireless LAN that operates in the 5 GHz band of the vehicle 3.
- the route guidance to which this embodiment is applied when the travel distance and travel time are extremely long, the travel distance and travel time are extremely low so that the frequency of occurrence of interference with other systems is as low as possible. You may make it perform the guidance considered so that it may not become long. The user may be able to select conventional route guidance that does not consider interference and route guidance according to the present embodiment that considers interference.
- FIG. 5 is a diagram illustrating an operation example of the in-vehicle terminal 1.
- FIG. 5 shows the vehicle 3 on which the in-vehicle terminal 1 is mounted, the radar station 31, the wireless communication area 54 indicating the reach of radio waves transmitted from the radar station 31, and the reach of radio waves transmitted from the in-vehicle terminal 1.
- a radio communication area 57, a building 58 that shields radio waves transmitted from the radar station 31, and a non-radio communication area 33 that indicates a range in which radio waves transmitted from the radar station 31 are shielded by the building 58 and no interference occurs are shown. ing.
- the radar station 31 is a radar station that operates while periodically rotating the object search direction (the transmission direction of the radar wave). It is assumed that no radar station other than the illustrated radar station 31 exists around the vehicle 3.
- the vehicle-mounted terminal 1 is located far from the radar station 31 at time t1 and is located outside the ⁇ 1> interference area, which is an area where interference does not occur (the radio communication areas 54 and 57 do not overlap).
- the wireless communication unit 16 of the in-vehicle terminal 1 uses the frequency band (CH c — 20) and communicates with the in-vehicle communication devices 2-1 and 2-2 illustrated in FIG.
- the vehicle 3 travels east, and reaches the boundary of the wireless communication area 54 where the radio wave from the radar station 31 reaches at the time t2.
- the wireless communication area prediction unit 15 of the in-vehicle terminal 1 Based on the map data 14, the positional relationship between the radar station 31 and the building 58 and the wireless communication area 54 of the radar station 31 are specified, and further, based on the current position notified from the current position detection unit 11 (in-vehicle It is understood that the terminal 1) is located in the non-wireless communication area 33 ( ⁇ 2> located in the interference avoidance area). Therefore, it is determined that there is no problem even if the frequency band (CH c — 20) is continuously used. As a result, the wireless communication unit 16 continues communication without switching the use frequency band.
- the frequency band CH c — 20
- the non-wireless communication area 33 ends and the wireless communication area 54 ( ⁇ 3> interference) Entering the area is detected based on the current position, interference data 13 and map data 14 notified from the current position detection unit 11.
- the wireless communication area prediction unit 15 instructs the wireless communication unit 16 to change the used frequency band.
- the radio communication range prediction unit 15 selects one of the clear channels. The wireless communication unit 16 is instructed to select according to the priority and switch to the selected channel.
- the wireless communication area prediction unit 15 instructs the wireless communication unit 16 to switch to the frequency band (CH c — 1) that is one of the clear channels, and the wireless communication unit 16 follows the instruction. Communication is continued by switching the frequency band used.
- the wireless communication unit 16 searches for a channel in which interference does not occur after entering the ⁇ 3> interference area. Continue communication using the channel. Also, the discovered channel is notified to the wireless communication area prediction unit 15 as a clear channel, and the wireless communication area prediction unit 15 that has received the notification registers the clear channel information in the interference data 13 together with the current position information and the like.
- the radio communication range prediction unit 15 uses the frequency band (CH It is determined that there is no problem even if c_20) is continuously used.
- the vehicle 3 When the vehicle 3 further moves, the vehicle 3 enters the tunnel at time t4, so that although the vehicle 3 is traveling in the radio communication area 54 of the radar station 31, no mutual interference occurs. Therefore, it is possible to use the frequency band (CH c_20) that the radar station 31 is using. If the clear channel information does not include that the interference data 13 does not interfere with the radar station 31 through the tunnel, the frequency band (CH c_20) is additionally registered in the interference data 13 as the clear channel information at this position. . Further, when the interference data 13 is managed by the database server 19 on the Internet 18 and shared with other communication devices, the wireless communication area prediction unit 15 is configured by the wide area wireless communication unit 17 or the wireless communication unit 16. The clear channel information is registered in the database server 19 via.
- FIG. 6 is a flowchart showing an example of a channel switching operation procedure in the in-vehicle terminal 1.
- the wireless communication unit 16 of the in-vehicle terminal 1 communicates with the wireless communication terminals 2-1 and 2-2 using the 5 GHz band (step S10).
- the wireless communication unit 16 detects another system (such as a radar station) that uses the same frequency band as itself, it collects information about the detected system and notifies the wireless communication range prediction unit 15 of it. .
- the wireless communication area prediction unit 15 confirms the received information, and determines that another system (new interference source) not registered in the interference data 13 is detected (step S11), confirms the interference data. In the current position, it is confirmed whether or not there is a clear channel that does not cause interference with other systems (step S12).
- step S12 When the clear channel exists (step S12: Yes), the radio communication area prediction unit 15 instructs the radio communication unit 16 to switch to the clear channel, and the radio communication unit 16 The operation of switching the channel used for communication with 1 and 2-2 to the instructed clear channel is started (step S13).
- a pre-operation search is performed in order to confirm whether there is no problem even if the operation on the clear channel is started (step S14).
- a usable channel a channel that does not cause interference with another system detected in step S11
- the wireless communication area prediction unit 15 registers the notified channel as interference channel 13 in association with the current position information as a newly detected clear channel (step S15).
- the wireless communication unit 16 switches to the clear channel operation and continues communication (step S16). If it is detected in the pre-operation search that the clear channel notified from the wireless communication area prediction unit 15 is actually a channel that causes interference, if there is another channel that does not cause interference, Switch to channel operation. If there is no other channel that does not cause interference, the communication is terminated.
- the wireless communication unit 16 is assumed to be capable of at least 5 GHz band wireless LAN communication.
- the wireless communication unit 16 and the wireless communication terminals 2-1 and 2-2 have 5 GHz band.
- the wireless communication unit 16 and the wireless communication terminals 2-1 and 2-2 have 5 GHz band.
- the 2.4 GHz band and the 60 GHz band are targeted. It is also possible to execute the search as well.
- the search for the 2.4 GHz band and the 60 GHz band is performed when a usable channel (a channel that does not cause interference with other detected systems) cannot be found in the search in the 5 GHz band. May be performed only.
- Steps S14 and S15 may be omitted if it is clear that interference with other systems does not occur when the designated clear channel is used. For example, when another system that has been detected in the past is re-detected and the elapsed time from the previous detection is short (for example, within a few days), step S14 and subsequent step S15 Is omitted. If these steps are omitted, the communication interruption time at the time of channel switching can be shortened.
- step S12 when there is no clear channel (step S12: No), the wireless communication area prediction unit 15 instructs the wireless communication unit 16 to switch to another channel without notifying the clear channel. Receiving this instruction, the wireless communication unit 16 performs a free channel search and checks whether there is a free channel that does not cause interference with another system detected in step S11 (step S17). In the empty channel search, usable frequency bands other than the 5 GHz band (2.4 GHz band and 60 GHz band) may be added to the target. When an empty channel is found (step S18: Yes), the wireless communication area prediction unit 15 is notified of the found empty channel (may be plural).
- the wireless communication area prediction unit 15 registers the notified empty channel as the clear channel at the current position in association with the current position information and the like in the interference data 13 (step S19). Further, the wireless communication unit 16 selects one of the free channels found in step S17, switches to the operation of the selected channel, and continues communication (step S20).
- step S17 If a free channel is not found as a result of the free channel search in step S17 (step S18: No), the wireless communication unit 16 notifies the wireless communication area prediction unit 15 of the information obtained by the search as interference channel information. Then, the wireless communication area prediction unit 15 registers the notified interference channel information in the interference data 13 (step S21). A search is performed for all channels including a usable frequency band other than the 5 GHz band. As a result, if no empty channel is found, the operation is stopped and communication is terminated (step S22: Yes, Step S23). After the communication is completed, the search for an empty channel may be performed again at a predetermined timing, and if an empty channel can be found, the communication may be resumed.
- the wireless communication area prediction unit 15 obtains the current position information and vehicle speed detection unit acquired from the current position detection unit 11. Based on the moving speed information acquired from 12, the interference data 13 and the map data 14, it is monitored whether or not an already detected interference source (radio communication area of another system) is approached.
- an approach of another system to the wireless communication area is detected (step S30)
- step S31 Yes
- operation communication
- step S32 On the other hand, when continuous use is impossible (step S31: No) step S12 mentioned above and the process following this are performed.
- the wireless communication apparatus acquires interference data, map data, and the like that are information on other systems in which interference occurs, acquired and held by a predetermined method. Based on the current position and speed of movement, it is determined whether there is a possibility of communication interference with other systems, and if there is a possibility of interference, switching to no interference is performed. It was decided to. In addition, if a channel that does not cause interference is found in a channel search that is performed at the time of channel switching, etc., it can be used as a usable channel (clear channel) that does not cause interference at that point (position where the channel search is executed).
- the interference information collected by performing channel search (various information related to other systems discovered by channel search) is registered in the database on the external network and shared with other wireless communication devices, Necessary information can be efficiently collected by determining whether there is a possibility of communication interference with the other system. Furthermore, even when traveling on a route that has not traveled in the past, that is, a route on which the user has not collected interference information, interference information collected by other wireless communication devices that have traveled the route It can be used to determine if there is a possibility of communication interference with other systems. Further, when there is a possibility that interference occurs in the channel being used, it is possible to know a channel in which no interference occurs.
- the wireless communication device according to the present invention is useful as a wireless communication device that is used while moving by being mounted on a mobile body, and in particular, other systems that use a unified frequency band. This is suitable for a wireless communication system capable of reducing interference on the mobile phone.
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Abstract
Description
本実施の形態では、本発明にかかる無線通信装置として、自動車に搭載された状態で無線通信を行う車載端末を例に説明する。図1は、本実施の形態の車載端末の構成例を示す図である。
2-1,2-2 車載通信装置
3 車両
4,5 電波
11 現在位置検出部
12 車速検出部
13 干渉データ
14 地図データ
15 無線通信圏予測部
16 無線通信部
17 広域無線通信部
18 インターネット(外部ネットワーク)
19 データベースサーバ
31 レーダー局
33 非無線通信圏
51 出発地
52 到着地
53,58 建物
54,54A,54B,54C,57 無線通信圏
55,56 ルート案内結果
Claims (7)
- 少なくとも5GHz帯を使用した無線通信が可能な通信手段と、
自装置の現在位置を検出する現在位置検出手段と、
前記通信手段が通信中の場合に、5GHz帯を使用しかつ静止状態で電波を送受信する他システムから送信された電波の到達範囲に関する情報である他システムデータと、地図データと、前記現在位置検出手段により検出された現在位置とに基づいて、前記通信手段が使用しているチャネルの切り替えが必要か否かを判定し、チャネルの切り替えが必要な場合には、さらに、切り替え先チャネルを自ら選択するまたは前記通信手段に選択させるチャネル切り替え制御手段と、
を備えることを特徴とする無線通信装置。 - 自装置の移動速度を検出する速度検出手段、
をさらに備え、
前記チャネル切り替え制御手段は、移動速度、現在位置、前記地図データおよび前記他システムデータに基づいて、前記通信手段が使用中のチャネルにおいて干渉が発生するかどうかを予測し、干渉発生が予測される場合には、前記通信手段に対して使用チャネルの切り替えを指示することを特徴とする請求項1に記載の無線通信装置。 - 前記通信手段は、5GHz帯を使用している他システムからの電波を所定のタイミングでモニタリングし、他システムからの電波を検出した場合には、さらに、検出した他システムの情報を収集し、
前記チャネル切り替え制御手段は、前記収集された情報と前記現在位置検出手段により検出された現在位置とに基づいて前記他システムデータを更新することを特徴とする請求項1または2に記載の無線通信装置。 - 前記通信手段は、他システムからの電波を検出した場合、検出した他システムの情報を収集するとともに、当該他システムとの間で相互干渉が発生しないチャネルであるクリアチャネルを検索し、
前記チャネル切り替え制御手段は、前記収集された情報と前記現在位置検出手段により検出された現在位置とに基づいて前記他システムデータを更新し、さらに、前記クリアチャネルが発見された場合には、当該クリアチャネルの情報を前記他システムデータに登録することを特徴とする請求項3に記載の無線通信装置。 - 前記チャネル切り替え制御手段は、前記通信手段が使用しているチャネルの切り替えが必要な場合、現在位置に対応するクリアチャネルが存在するかどうかを確認し、クリアチャネルが存在する場合には、クリアチャネルへの変更を前記通信手段に対して指示し、クリアチャネルが存在しない場合には、検出した他システムとの間で相互干渉が発生しないチャネルを検索してチャネルを切り替えるよう前記通信手段に対して指示することを特徴とする請求項4に記載の無線通信装置。
- 外部ネットワークへの接続手段、
をさらに備え、
前記外部ネットワーク上のデータサーバに前記他システムデータを登録し、他の無線通信装置との間で前記他システムデータを共有することを特徴とする請求項1~5のいずれか一つに記載の無線通信装置。 - ルート案内装置を備えた自動車に搭載され、
前記チャネル切り替え制御手段は、移動速度、現在位置、前記地図データおよび前記他システムデータに基づいて、現在位置を含む一定範囲内に存在している5GHz帯を使用した他システムを検出し、当該検出結果を考慮して案内ルートを決定するよう前記ルート案内装置に指示することを特徴とする請求項1~6のいずれか一つに記載の無線通信装置。
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DE112012006444T5 (de) | 2015-02-26 |
US9258760B2 (en) | 2016-02-09 |
US20140378179A1 (en) | 2014-12-25 |
DE112012006444B4 (de) | 2023-01-26 |
JP5769882B2 (ja) | 2015-08-26 |
CN104170429B (zh) | 2018-06-19 |
CN104170429A (zh) | 2014-11-26 |
JPWO2013179397A1 (ja) | 2016-01-14 |
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