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WO2013190672A1 - Système de communication sans fil, procédé, et dispositif - Google Patents

Système de communication sans fil, procédé, et dispositif Download PDF

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Publication number
WO2013190672A1
WO2013190672A1 PCT/JP2012/065790 JP2012065790W WO2013190672A1 WO 2013190672 A1 WO2013190672 A1 WO 2013190672A1 JP 2012065790 W JP2012065790 W JP 2012065790W WO 2013190672 A1 WO2013190672 A1 WO 2013190672A1
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WO
WIPO (PCT)
Prior art keywords
terminal
wireless communication
base station
base stations
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/065790
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English (en)
Japanese (ja)
Inventor
栄里子 武田
雄介 正村
玉木　諭
小野　豪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2014521160A priority Critical patent/JP5925310B2/ja
Priority to PCT/JP2012/065790 priority patent/WO2013190672A1/fr
Publication of WO2013190672A1 publication Critical patent/WO2013190672A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data

Definitions

  • the present invention relates to a radio communication technique in a radio communication system that performs communication between a mobile terminal and a plurality of base stations.
  • Patent Document 1 For communication with a mobile terminal that moves within a range that cannot be covered by one base station, it is necessary to change the base station to be connected according to the movement of the mobile terminal.
  • Patent Document 1 a pair of wireless communication devices installed at the uppermost part of the elevator hoistway and the upper part of the car, and at the lowermost part of the elevator hoistway and the lower part of the car.
  • the characteristics of the reception power level of the communication wave according to the car position are set as the threshold value of the car that intersects the two pairs of wireless communication apparatuses, and the two sets of wireless communication apparatuses are compared by comparing the car position information with the threshold value.
  • a method for switching received data in pairs is disclosed.
  • Patent Document 2 discloses a communication switching method between different wireless communication systems using software defined radios.
  • the software defined radio includes a plurality of CPUs (Central Processing Unit) and FPGA (Field Programmable Gate Array).
  • CPUs Central Processing Unit
  • FPGA Field Programmable Gate Array
  • Patent Document 3 in the communication method of the wireless communication system, when the wireless environment between the transmitting station that sends data and the node that receives the data is not good, the intercepting station retransmits the data, and delay time due to retransmission control is reduced. A method for suppressing the increase and reducing transmission errors is disclosed.
  • Patent Document 1 discloses a switching method that uses the position of a mobile terminal to switch between two sets of wireless systems that accompany the movement of the terminal. Further, Patent Document 2 discloses a method for performing high-speed switching seamlessly by mounting a plurality of CPUs and FPGAs. Patent Document 3 discloses a retransmission control method using an intercepting station other than a base station.
  • the system In order to provide a high-performance wireless communication system, even when the base station to which the terminal is connected changes, the system should be operated so that the packet error rate, etc. is less than the value required by the system. is required. In order to provide a low-cost wireless communication system, it is necessary to widen the communication range that can be covered by one base station and to cover the movement range of terminals with a small number of base stations.
  • An object of the present invention is to solve the above-described problems, and in a wireless communication system in which a terminal moves and communicates while changing a connected base station, a wireless communication system capable of reducing deterioration in communication performance due to a change of a connected base station It is in providing a method and an apparatus.
  • Another object of the present invention is to provide a radio communication system, method, and apparatus capable of widening the communication range that can be covered by one base station when a plurality of base stations are installed in accordance with the movement range of the terminal. There is.
  • a wireless communication system A terminal capable of communicating while moving within a predetermined range; a control device that performs operation control of the terminal; a plurality of base stations that perform wireless communication of signals between the control device and the terminal; and a plurality of base stations
  • a wireless communication control device that controls wireless communication between the base station and the terminal, the terminal is capable of communicating with at least a plurality of base stations, and the terminal and the plurality of base stations depending on the position of the terminal
  • a wireless communication system configured to change the operation of wireless communication with the mobile phone.
  • a wireless communication method for performing wireless communication between a terminal moving within a predetermined range and a base station, wherein the terminal communicates with at least a plurality of base stations.
  • Wireless communication is possible, and by controlling wireless communication between a plurality of base stations and terminals, signals are transmitted and received between the control device that controls the operation of the terminal and the terminal, and depending on the position of the terminal.
  • a wireless communication method for changing the operation of wireless communication between a terminal and a plurality of base stations is provided.
  • wireless communication control for controlling wireless communication between a plurality of base stations and a terminal that moves within a predetermined range and can communicate with the plurality of base stations.
  • An apparatus comprising: an interface unit connected to a plurality of base stations; and a control unit that controls wireless communication between the terminal and the plurality of base stations.
  • An operation instruction signal for instructing an operation of wireless communication with a base station is created, and the created operation instruction signal is transmitted to a plurality of base stations via an interface unit, so that the terminal and Provided is a wireless communication control device configured to change the operation of wireless communication with a plurality of base stations.
  • a highly reliable wireless communication system can be provided.
  • FIG. 1 is a diagram illustrating a configuration of a wireless communication system according to a first embodiment. It is a figure which shows the operation
  • FIG. 1 is a diagram illustrating a configuration of a control device in Embodiment 1.
  • FIG. 1 is a diagram illustrating a configuration of a control device in Embodiment 1.
  • FIG. 6 is a diagram showing an example of an operation number table in the first embodiment.
  • FIG. 3 is a diagram illustrating a configuration of a transmission signal control unit according to the first embodiment.
  • 1 is a diagram illustrating a configuration of a wireless communication control device in Embodiment 1.
  • FIG. 1 is a diagram illustrating a configuration of a wireless communication control device in Embodiment 1.
  • FIG. 6 is a diagram illustrating an example of a control table in the first embodiment. It is a figure which shows an example of the flowchart of operation
  • FIG. 2 is a diagram illustrating a configuration of a base station in Embodiment 1.
  • FIG. 3 is a diagram illustrating a configuration of a terminal according to the first embodiment.
  • FIG. 6 is a diagram illustrating an example of a flowchart of an operation of a wireless communication management unit according to the first embodiment.
  • FIG. 10 is a diagram illustrating a configuration of a transmission signal control unit according to a second embodiment.
  • FIG. 10 is a diagram illustrating a configuration of a wireless communication control device according to a third embodiment.
  • FIG. 10 is a diagram illustrating a configuration of a wireless communication control device according to a fourth embodiment.
  • FIG. 10 is a diagram illustrating an example of a performance management table in the fourth embodiment.
  • a terminal When communicating with the control device while moving between the cover areas of the base station B from the cover area, the range of movement can be achieved only by communication with the base station A or the base station B, and desired performance such as a packet error rate can be obtained.
  • the terminal In the case of moving from the coverage area of the base station A toward the coverage area of the base station B, it is composed of the obtained range, a range where desired performance is obtained by communication with both the base station A and the base station B, In a range where the desired performance can be obtained only by communication with the base station A, the terminal communicates only with the base station A, and in a range where the desired performance can be obtained by communication with both the base stations A and B, the terminal Of station A and base station B Communicating with people, and in a range where the desired performance is obtained for communication only with the base station B, so as to only communicate with base station B, and change its behavior. This change in operation is determined by the location of the terminal. Various examples will be described in detail below.
  • FIG. 1 shows a configuration of a wireless communication system according to the first embodiment.
  • the wireless communication system includes a terminal 7, a control device 1 that controls the terminal 7, and a plurality of base stations 3 to 6 that wirelessly communicate a signal for controlling the operation of the terminal that the control device 1 transmits to the terminal 7.
  • the wireless communication control device 2 is configured to control wireless communication between a plurality of base stations and terminals.
  • the terminal 7 is configured to move within a predetermined range and to be able to communicate with a plurality of base stations 3 to 6.
  • a configuration example of the terminal 7 a case will be described in which two sets of wireless transmission / reception units capable of communication with one base station are mounted so that wireless communication with two base stations can be performed.
  • control device 1 that controls the movement of the terminal 7
  • wireless communication control device 2 that controls the wireless communication between the plurality of base stations and the terminal will be described as independent components. It is also possible to configure as a single control device having both functions of terminal movement control and wireless communication control.
  • the movement of the terminal 7 is managed by the control device 1.
  • the terminal 7 is determined from the communication range covered by the base station A to the communication range covered by the base station B, next to the communication range covered by the base station C, and further toward the communication range covered by the base station D. It will move according to the route.
  • the range in which the terminal 7 moves includes a range (sometimes referred to as a first area) in which desired characteristics, for example, a desired packet error rate can be obtained by communication with a single base station, and a plurality of ranges.
  • TCP Transmission Congrol Protocol
  • FIG. 2 as wireless communication operations, wireless communication with base station A, wireless communication with base station A and base station B, and wireless communication with base station B, separated by the two dotted lines in FIG. Is illustrated.
  • the wireless communication operation is not limited to the case where the moving terminal 7 wirelessly communicates with a single base station and two base stations, but may also wirelessly communicate with three or more base stations.
  • the control device 1 that performs the movement control of the terminal periodically transmits the location information 101 of the terminal to the wireless communication control device 2 that controls the wireless communication.
  • the data signal 102 transmitted from the control apparatus 1 is converted into a radio signal by the base station A 3 via the radio communication control apparatus 2 and sent to the terminal 7. Then, it is received by a wireless transmission / reception unit A8 provided in the terminal 7, which will be described in detail later with reference to the drawings, and transmitted to the wireless communication management unit 10 provided in the terminal 7.
  • FIG. 2 shows an example in which a signal is transmitted to the wireless communication management unit 10, but the received signal is provided in the terminal 7 according to the content, and will be described later with reference to the drawings. Each function block is transmitted.
  • the wireless transmission / reception unit A8 When a signal is received by the wireless transmission / reception unit A8 provided in the terminal 7, whether the signal is correctly received or not correctly received at the media access control (Media Access: MAC) level is determined by the wireless transmission / reception unit A8. It is judged by. If the wireless transceiver A8 determines that the signal is correctly received at the MAC level, it transmits a signal to the upper layer, and if it is determined that the signal is also correctly received by the upper layer, the wireless communication manager 10 determines that the TCP level acknowledgment (Acknowledgement: ACK)) 103 is returned to the control device 1.
  • the wireless transmission / reception unit includes a wireless front end unit, a baseband unit, and a MAC unit.
  • the wireless communication control device 2 passes the terminal via the wireless transmission / reception unit A8 of the terminal 7
  • the wireless communication management unit 10 transmits a signal 104 instructing the wireless transmission / reception unit B9 to start connection with the base station B4.
  • the wireless communication management unit 10 transmits a response signal 105 to the signal, and the wireless communication management unit 10 instructs the wireless transmission / reception unit B9 to start connection with the base station B4.
  • the wireless transmission / reception unit B9 performs a connection 107 with the base station B4, and transmits a connection completion notification 108 to the wireless communication control apparatus 2 via the base station B4 after the connection is completed.
  • the wireless communication control device 2 is configured so that the operation up to this point is completed before the terminal 7 moves within a range where a desired packet error rate can be obtained by communicating with both the base station A3 and the base station B4. Transmits a signal 104 instructing the start of connection processing with the base station B4.
  • the data signal transmitted from the control device 1 is transmitted by the radio communication control device 2 to the base station A3.
  • the wireless transmission / reception unit A8 of the terminal 7 transmits from the wireless communication control device 2 via the base station B.
  • a signal 113 instructing to turn off the power is transmitted.
  • the wireless communication management unit 10 transmits ACK 114 to the wireless communication control device 2.
  • the base station A3 is set to disconnect 119 from the terminal 7 when communication with the terminal 7 does not occur for a certain period of time.
  • the control device 1 and the terminal 7 exchange the data signal 115 and the ACK 116 via the base station B4.
  • the operation sequence shown in FIG. 2 shows an example in which the terminal 7 can correctly receive a signal and returns an ACK.
  • the operation sequence shown in FIG. 2 when the terminal 7 moves to a range where a desired packet error rate can be obtained by communication with only the base station B4, the power of the wireless transmission / reception unit A8 of the terminal 7 from the wireless communication control device 2 The signal 113 for instructing to be turned off is transmitted. However, this operation may not be performed, and the power of the wireless transmission / reception unit A8 may be kept on.
  • the wireless transmission / reception unit A8 may be set to communicate with the base station C5.
  • FIG. 3A shows an example of a functional configuration of the control device 1
  • FIG. 3B shows an example of a hardware configuration of the control device 1.
  • the control device 1 includes an operation control unit 20 that controls the operation of the terminal, a movement control unit 21 that controls the movement of the terminal, a wired interface (IF) 22, and a bus 23. Consists of. 3B, the control device 1 can be realized by a normal computer configuration.
  • the control device 1 is a central processing unit (Central processing unit).
  • a processing unit (CPU) 201, a memory 202 as a storage unit, and an input / output unit 203 may be provided as necessary.
  • the CPU 201 executes an operation control program and a movement control program for realizing the operation control unit 20 and the movement control unit 21 described above.
  • These various programs, including the operation number table, are stored in the memory 202 and the like, and are executed by the CPU 201 as necessary, thereby realizing various functions described below.
  • the operation control unit 20 includes an operation determination unit 24, an operation number table holding unit 25, a signal creation unit 26, and a transmission signal control unit 27.
  • the operation determination unit 24 in the operation control unit 20 determines an operation to be performed by the terminal 7 and selects an operation number corresponding to the operation from the operation number table 250 held in the operation number table holding unit 25. .
  • Each functional block other than the operation number table holding unit 25 in the operation control unit 20 can be realized by executing the operation control program described above.
  • the operation number table held by the operation number table holding unit 25 is stored in the memory 202.
  • FIG. 4 shows an example of this operation number table.
  • the operation number table 250 describes an operation number 251 and an operation 252 to be performed by the terminal.
  • information about the possibility 253 related to other operations may be described in the table.
  • the operations corresponding to operation numbers 1 to 4 in FIG. 4 are operations that may be associated with at least one other operation. For example, as an operation for a transport vehicle used in a factory, the transport vehicle is moved to a predetermined position and stopped, or the movement is started after closing a door. There are operations 1 to 4 that do not become a desired operation when the order of operations is reversed. These are shown as possibly related to other actions.
  • the operation number 0 is returned to the initial state, the loading amount of the loading platform of the operation number 5 is reported, and the temperature in the loading platform of the operation number 6 is not related to other operations, and the operation is completed by itself. Is. These are shown as having no possibility of being related to other operations.
  • the operation number table 250 is shared and held by at least the control device 1 and the terminal 7, and the operation of the terminal 7 is controlled by exchanging the operation number 251. .
  • the operation determination unit 24 in the operation control unit 20 determines an operation to be performed by the terminal 7, selects a number corresponding to the operation in the operation number table 25, and transmits the number to the signal creation unit 26.
  • the signal creation unit 26 creates a signal for transmitting the signal to the terminal 7.
  • the signal is transmitted to the terminal 7 via the transmission signal control unit 27, the wired interface 22, the wireless communication control device 2, and the base station. In this embodiment, it is assumed that the signal is transferred by packet.
  • the movement control unit 21 in the control device 1 in FIG. 3A performs control related to the movement of the terminal 7.
  • the function of the movement control unit 21 can be realized by executing a program by the CPU 201.
  • the movement determining unit 28 determines the moving speed and moving direction of the terminal 7, the position of the terminal at time t, or the position after T seconds based on a certain time.
  • the information related to the movement of the terminal is transmitted to the position information signal creation / transmission unit 29, and a signal is created and transmitted as position information to be transmitted to the wireless communication control device 2.
  • the operation control unit 20 and the movement control unit 21 are stored in the control device 1, but the operation control unit 20 and the movement control unit 21 are different from each other, such as two computers. It may exist as a device.
  • the transmission signal control unit 27 includes a response signal collection unit 271, a retransmission determination unit 272, an output designation unit 273, and a signal holding unit 274.
  • the signal holding unit 274 includes a transmission scheduled signal holding unit 275 and a transmitted signal holding unit 276.
  • the signal holding unit 274 can be configured by a buffer in the CPU 201, and can also be configured by a predetermined storage area in the memory 202.
  • the response signal collection unit 271 receives the response signal from the terminal 7 and holds the result.
  • the retransmission determination unit 272 accesses the response signal collection unit 271, determines whether the result is correctly received or whether it is not received correctly and needs to be retransmitted, and transmits the determination result to the output designation unit 273.
  • the signal holding unit 274 includes a transmission-scheduled signal holding unit 275 that holds a signal that is transmitted from the signal creation unit 26 and is to be transmitted, and a transmission signal holding unit 276 that holds a signal that has already been transmitted. If ACK is returned from the terminal 7 within a predetermined time, the output specifying unit 273 reads and transmits the data held in the transmission scheduled signal holding unit 275. If no ACK is returned from the terminal 7 within a predetermined time, it is determined that the terminal 7 has not received the signal correctly, and the data held in the already-transmitted signal holding unit 276 is read and retransmitted. If an ACK is returned within a certain period of time, there is no need to hold the already transmitted signal. Therefore, after transmitting the scheduled transmission signal, the information is written in the already transmitted signal holding unit 276. Further, the next transmission scheduled signal from the signal creating unit 26 is written in the transmission scheduled signal holding unit 275.
  • the transmission signal control unit 27 is provided with the signal holding unit 274 and the buffer in the CPU 201 is used.
  • the buffer in the wired interface 22 is used as the signal holding unit 274.
  • the output designation unit 273 may designate the output to the buffer of the wired interface 22.
  • the wireless communication control device 2 includes a wired interface 30 on the control device 1 side, a wired interface 31 and a bus 32 on the base station side, and a connection control unit 33.
  • the wireless communication control device 2 can be configured by a normal computer including a CPU and a memory, such as by realizing the connection control unit 33 described in detail below by program processing, like the control device 1 described above. The description of the configuration is omitted.
  • connection control unit 33 controls connections between the plurality of base stations 3 to 6 and the plurality of wireless transmission / reception units 8 and 9 provided in the terminal 7. As shown in FIG. 6, the connection control unit 33 includes a position calculation unit 34, an operation determination unit 35, a control table holding unit 36, and an operation instruction signal creation unit 37.
  • the position calculation unit 34 calculates the position of the terminal 7 at time t based on the position information from the control device 1. If the position information transmitted from the control device 1 is the position of the terminal 7 at the time t, the information is used, and the movement speed and movement direction of the terminal 7 or position information after T seconds based on a certain time. If there is, the position of the terminal at the time t is calculated using the information, and for example, a table 340 indicating the relationship between the time 341 and the terminal position 342 as shown in FIG. Hold.
  • the operation determination unit 35 determines and manages operations of the radio communication control device, the base station, and the radio transmission / reception unit of the terminal.
  • the operation instruction signal creation unit 37 creates an operation instruction signal according to the determination of the operation determination unit 35 and transmits it to a predetermined device.
  • the control table holding unit 36 held in a memory or the like holds a control table 360 shown in FIG.
  • the control table 360 includes the location 361 of the terminal and the operation classification 362 corresponding thereto, that is, the classification of whether communication is performed by one set of the base station and the radio transmission / reception unit, or communication by plural sets of the base station and the radio transmission / reception unit, connection It is the table
  • the operation determination unit 35 of the connection control unit 33 reads the position of the terminal 7 at the time t from the position calculation unit 34 by periodically accessing the position calculation unit 34 and the control table holding unit 36, and the control table holding unit By referring to the control table 36, it is determined which base station and which radio transmission / reception unit of the terminal are to be connected. Based on this, it is determined in which wired IF 31 buffer the signal sent from the control device 1 is stored.
  • the operation determination unit 35 instructs the terminal 7 to start connection with the base station, instructs the base station that is the communication partner to use the radio frequency, An operation relating to wireless communication between the terminal and a plurality of base stations, such as a power-off instruction, is determined.
  • the wireless communication system of the present embodiment when a plurality of base stations 3 to 6 communicate with the terminal 7, these base stations communicate using at least different frequencies from the adjacent base stations. Configure as follows. Therefore, you may comprise so that the frequency which a base station uses may be notified to the terminal 7 using the signal which instruct
  • the wireless transmission / reception units 8 and 9 of the terminal 7 upon receiving an instruction to start connection with the base station, start connection processing with the base station. If the wireless transceivers 8 and 9 do not know the frequency used by the base station that is the connection partner, the wireless transceivers 8 and 9 sequentially select the frequencies that the base station may use until receiving a connection response signal from the base station. However, if the frequency used by the base station to be connected is notified in advance as in this embodiment, the terminal 7 sends the connection request signal only at that frequency. Since it is sufficient to transmit, the time required for connection can be shortened.
  • a plurality of radio transceiver units of the terminal and a plurality of base stations communicating with the plurality of radio transceiver units are synchronized, and each base station communicates with the radio transceiver unit of the terminal. It is good also as a structure which communicates between a base station and a terminal by dividing time. In this case, the terminal may be notified of the timing at which communication with the connected base station is possible.
  • the operation determination for the radio communication control device, the base station, and the terminal, and the signal generation unit for instructing the operation are shown as one operation determination unit 35 and one operation instruction signal generation unit 37.
  • a configuration may be adopted in which a plurality of computers are used, and an operation determination unit and an operation instruction signal generation unit are individually provided for each apparatus.
  • FIG. 9 shows an operation flowchart of the operation determining unit 35 of the wireless communication control device 2.
  • the operation determining unit 35 periodically accesses the position calculating unit 34 and the control table holding unit 36, and is there a single base station currently communicating with the terminal? (350) is determined. If there is a single connected base station, is the transmission of the instruction signal for starting connection with the other base station to the terminal in time for the subsequent transmission timings? (351) is determined. If the determination result is yes, the operation is continued as it is (355), and if it is no, a signal instructing the terminal to start connection with a predetermined base station is created and transmitted (352). Is there a single base station currently communicating with the terminal?
  • the determination result for (350) is no, then, is the terminal position at the next transmission timing within a range that allows communication with a single base station? (353) is determined. If the determination result is yes, a signal is generated and transmitted (354) instructing the terminal to turn off the power of the wireless transmission / reception unit that does not require communication with the base station. If the determination result is no, the operation is continued (355).
  • the operation determination unit also gives an instruction to hold a signal addressed to the terminal from the control device received via the wired interface 30 in a buffer in the predetermined wired interface 31.
  • the signal is transmitted only to the buffer of the predetermined wired interface as described above.
  • the signal is stored in the buffers of all the priority interfaces 31 and the signal is transmitted only from the predetermined wired interface 31 to the base. Needless to say, it may be transmitted to a station.
  • the base station A3 includes a wired interface 400, a base station wireless transmission / reception unit 401, a bus 402, an antenna 403, and a base station operation control unit 404.
  • the wired interface 400 exchanges signals with the wireless communication control device 2.
  • the base station wireless transmission / reception unit 401 performs wireless communication with the terminal via the antenna 403.
  • the digital signal received by the wired interface 400 is converted into a radio signal by the base station radio transmission / reception unit.
  • a radio signal received via the antenna 403 is converted into a digital signal by the base station radio transmission / reception unit 401.
  • the base station radio transmission / reception unit 401 includes a high-frequency front end unit, a baseband unit, and a MAC unit.
  • the base station operation control unit controls the operation of the base station, for example, by disconnecting from the terminal when communication does not occur between the base station and the terminal for a certain period of time.
  • the control device 1 can be configured by a CPU and a memory.
  • the terminal 7 includes a plurality of antennas 700 and 701, a plurality of wireless transmission / reception units 702 and 703, a wireless communication management unit 704, a communication quality management unit 705, an operation response unit 706, and a bus 707.
  • the plurality of wireless transmission / reception units 702 and 703 and the wireless communication management unit 704 correspond to the wireless transmission / reception units A8 and B9 and the wireless communication management unit 10 illustrated in FIG.
  • Each functional block of the wireless communication management unit 704, the communication quality management unit 705, and the operation response unit 706 connected to the bus 707 can be configured with a CPU, a memory, and the like as in the control device 1 described above.
  • the terminal is provided with two antennas. However, if the antenna can be shared for communication with a plurality of base stations, the number of antennas may be singular.
  • the operation response unit 706 of the terminal holds the same operation number table as the operation number table shown in FIG. 4 in the operation response unit 706, and performs the operation of the terminal 7 according to the operation number transmitted by the signal from the control device 1. Do. For example, when the signal sent from the control device 1 is the operation number 5, the operation of reporting the loading amount of the loading platform to the control device 1 is performed.
  • the communication quality management unit 705 collects, manages, and holds the radio communication quality between the radio transmission / reception units 8 and 9 and the base stations 3 to 6, for example, received power.
  • the information on the received power is the value of the received power of the signal between which radio transceiver and which base station, and the time when the signal is received, or when the terminal itself can grasp the position of the terminal The information is held in combination with the position of the terminal when the signal is received.
  • the collected / held information can be used when determining a failure of the base station or the wireless transmission / reception unit, or when updating the control table 360 stored in the control table holding unit 36 of the wireless communication control device 2. If there is no need to collect information for failure determination and control table update by another method, or for other purposes, it is necessary to collect wireless communication quality between the terminal and the base station on the terminal side.
  • the quality management unit 705 is not necessarily provided.
  • the wireless communication management unit 704 manages wireless communication between the base station and the wireless transmission / reception unit of the terminal. For example, as indicated by an instruction 105 in FIG. 2, the wireless transmission / reception unit is instructed to start connection with the base station.
  • the wireless transmission / reception unit A 702 and the wireless transmission / reception unit B 703 receive an instruction from the wireless communication management unit 704 and connect to the base station.
  • the wireless communication management unit 704 transmits a connection completion notification 108 to the wireless communication control device 2 after the connection is completed, an instruction 106 for starting connection with the base station according to an instruction from the wireless communication control device 2, Power off 118 is performed.
  • the wireless transmission / reception units 702 and 703 are composed of a wireless front end unit, a baseband unit, and a MAC unit.
  • each MAC unit of the wireless transmission / reception unit determines whether the signal received via the base station has been correctly received, and transmits the result to the wireless communication management unit 704.
  • a plurality of wireless transmission / reception units may receive the same signal, so the wireless communication management 704 determines the reception results at the plurality of wireless transmission / reception units in an integrated manner.
  • ACK is transmitted to the control device.
  • the signal sent from the control device 1 is sent with a sequence number attached at the TCP level.
  • the radio communication control apparatus 2 transmits a signal to the base stations 3 to 6, information indicating whether it is a signal sent from a single base station or a signal sent from a plurality of base stations
  • the configuration is such that the header is added to the base station.
  • the base stations 3 to 6 are configured to be able to determine whether a signal is transmitted from only one base station or a plurality of base stations by reading this information.
  • the operation of wireless communication between a base station and a terminal will be described when a single base station and a single wireless transmission / reception unit are communicating, in other words, when the terminal is in the first area.
  • the wireless transmission / reception unit correctly receives the signal from the base station, the wireless transmission / reception unit returns an ACK at the MAC level. If the base station cannot receive ACK for a certain period of time, it determines that the terminal has not received the ACK correctly, and performs retransmission.
  • the wireless communication management unit When the wireless transmission / reception unit receives a signal correctly, the wireless communication management unit notifies the wireless communication management unit that the signal has been received correctly, and the wireless communication management unit returns an ACK to the control device.
  • the wireless transmission / reception unit may be configured to discard signals that could not be received correctly.
  • the base station When the same signal is transmitted from a plurality of base stations, the base station is configured not to perform retransmission even if the ACK signal at the MAC level is not received for a certain period of time.
  • the terminal If the terminal can receive a signal for notifying that the signal of a certain sequence number has been correctly transmitted at the MAC level even from one of a plurality of wireless transmission / reception units, the terminal transmits an ACK to the control device. Return it.
  • FIG. 12 shows a flowchart of the operation of wireless communication by the wireless communication management unit 704 of the terminal 7 described above.
  • the terminal corresponds to the case where the operation classification 362 of the control table 360 shown in FIG.
  • two wireless transmission / reception units receive signals of the same sequence number, one radio transmission / reception unit can receive correctly, and the other wireless transmission / reception unit cannot receive correctly, Since the terminal 7 has correctly received the signal from the control device 1, an ACK can be returned to the control device 1.
  • sequence number information may be added to the ACK sent from the terminal to the control device.
  • the controller sends the signals shown in Fig. 4 that may be related to other operations and the ones whose order is important are sent continuously, the sequence number is added according to the sequence of the operations.
  • the control device can send the signal again from the lost signal, the order in which the terminal is operated can be maintained.
  • the wireless communication management unit determines that the wireless transmission / reception unit has not been able to receive correctly when it has not received a signal from the wireless transmission / reception unit for a certain period of time. However, it is also possible to transmit a signal notifying that the radio transmission / reception unit has not been correctly received.
  • the wireless communication management unit when the wireless communication management unit receives a signal notifying that a signal with a certain sequence number has been correctly received from the wireless transmission / reception unit, it is sent from the other wireless transmission / reception unit thereafter. For the same sequence number, a signal notifying that the reception has been correctly performed may be discarded.
  • the moving range of the terminal is a range (first area) in which a desired packet error rate can be obtained even in communication with one base station, and a plurality of base stations.
  • first area one base station and a terminal communicate with each other
  • second area a plurality of base stations and terminals communicate with each other.
  • the change in operation is determined by the location of the terminal.
  • the location information of the terminal is set so that it can already communicate with a plurality of base stations. Based on the above, the base station is connected in advance. For this reason, even if the terminal moves, communication between the terminal suitable for the position and the base station can be performed, so that a wireless system having a desired packet error rate can be provided.
  • two types of communication ranges of the first area and the second area as in this embodiment.
  • the range that can be covered by one base station can be increased.
  • the control apparatus can determine whether or not the terminal has correctly received the signal by adopting the configuration shown in this embodiment.
  • a wireless communication method related to transmission control when signals having different allowable delay times are transmitted will be described.
  • a signal type determination unit 277 is provided as a component of the transmission signal control unit 27 of the operation control unit 20 of the control device 1 instead of the retransmission determination unit 272 shown in FIG. It has been.
  • the signal type determination unit 277 determines the transmission order by determining the allowable delay time for the signal transmitted from the control device.
  • the operation number to be transmitted to the terminal and its allowable delay time are transmitted from the operation determination unit 24 to the signal type determination unit 277.
  • the signal type determination unit 277 determines which signal is to be transmitted next according to the operation flowchart shown in FIG. 14 and transmits the result to the output designation unit 273.
  • the packet error is reduced by controlling the transmission order according to the situation. be able to.
  • the system configured such that the control device 1 receives the response signal from the terminal has been described.
  • the wireless communication control device 2 of the wireless communication system is used. An embodiment for receiving the response signal will be described.
  • FIG. 15 shows the configuration of the wireless communication control device 2 according to the third embodiment.
  • the transmission signal control unit 27 is provided in the control device 1, but in the third embodiment, the transmission signal control unit 370 is provided in the wireless communication control device 2.
  • response signals from the wireless communication management unit 704 of the terminal are collected in the response signal collection unit 371 of the wireless communication control device 2.
  • the retransmission determining unit 372 periodically accesses the response signal collecting unit 371, and if the ACK is received, notifies the operation determining unit of the control device that the transmission has been correctly performed.
  • the output designation unit 373 accesses the transmission signal holding unit 376 and retransmits the signal. If ACK is not received even if retransmission is repeated within a certain time for the same signal, retransmission determining section 372 notifies the operation determining section of the control device that the signal transmission has not been performed correctly. That is, in the present embodiment, the control device 1 is configured to transmit a transmission signal to the wireless communication control device 2 and be notified that the wireless communication control device 2 has been able to transmit correctly or has not been transmitted correctly. ing.
  • the terminal 7 communicates with one base station or a plurality of base stations so as to obtain a desired performance. In the fourth embodiment, however, the terminal 7 is initially set due to a change in the surrounding environment. When the desired performance cannot be obtained by communication between the base station and the terminal, the control table is updated.
  • the response signals from the terminals are collected by the wireless communication control device 2.
  • the response signal collection unit 371 includes a performance determination unit 380, a performance management table holding unit 381, and a control table update determination unit 382.
  • the performance determination unit 380 collects response signals, determines whether desired performance is achieved from the result, and notifies the performance management table holding unit 381 of the result. As shown in FIG. 17, the performance management table holding unit 381 has a performance management table 390 that indicates whether the desired performance has been achieved or has not been achieved 392 based on the terminal position 391 and the result of the response signal at that position. Create and hold it.
  • the control table update determining unit 382 periodically accesses the performance management table holding unit 381. When a location that has not been achieved occurs, the control table update determination unit 382 determines to update the control table, and determines the location that has not been achieved to the connection control unit 33. This is transmitted to a certain control table management unit 383.
  • the control table management unit 383 refers to the current control content for the location where performance is not achieved, determines how to update, and rewrites the control table held in the control table holding unit 36 based on the result. For example, as shown in FIG. 17, if the desired performance cannot be achieved when the terminal position is between 35 m and 40 m, the base station A and the terminal position between 0 and 35 m in the control table 360 The communication table is communicated by one set of the wireless transmission / reception unit A, and the control table is set so that communication is performed by two sets of the base station A and the wireless transmission / reception unit A and the base station B and the wireless transmission / reception unit B when the position of the terminal is 35 to 80 m Update.
  • control table update determining unit 382 periodically accesses the performance management table holding unit 381. However, when the performance management table holding unit 381 has an unachieved portion in the performance management table. Alternatively, an instruction to update may be issued to the control table management unit 383.
  • the communication between the base station and the wireless transmission / reception unit is one set or two sets.
  • the terminal has a function capable of wireless communication with three or more base stations.
  • a change in communication operation a change in which a range that has been communicated with two base stations until now can be communicated with three base stations.
  • the transmission power of the base station can be changed, a change that changes the transmission power may be used.
  • the update method of the control table shown in the present embodiment is an example, and as other update methods, for example, the communication quality management unit 705 provided in the terminal, the position of the terminal or the time when the signal is received, It is good also as a structure which manages the reception result in the radio
  • the position of the terminal where the desired performance is not achieved is determined by calculating the position of the terminal from that time, and the control table is based on that. What is necessary is just to set it as the structure updated.
  • the wireless communication control device grasps the position of the terminal based on the position of the terminal at time t, that is, based on time, and controls the operation of the wireless communication system.
  • the wireless communication control device instructs the terminal to perform a predetermined operation when it comes to the predetermined position. You may make it output the signal which instruct
  • the terminal when the terminal movement is controlled by the terminal instead of the control apparatus, the terminal may be configured to notify the wireless communication control apparatus of information regarding the movement of the terminal.
  • the terminal of the wireless communication system of the present invention only needs to be configured to be able to communicate with two or more base stations.
  • a wireless transmission / reception unit having the ability to communicate with one base station is provided.
  • Two sets are provided, and each wireless transmission / reception unit includes a wireless front-end unit, a baseband unit, and a MAC unit.
  • the configuration is not limited to the configuration shown in the first embodiment as long as the configuration is a terminal capable of communicating with a plurality of base stations, which is the gist of the present invention.
  • the terminal may be configured to stop the operation of functions other than those required for communication with the base station according to the position of the terminal.
  • the communication area is further divided into areas where the terminal communicates with one base station, an area where the terminal communicates with two base stations, an area where the terminal communicates with three base stations, and the like. May be.
  • the terminal by setting the terminal to be a terminal capable of communicating with a plurality of base stations, a communication range for obtaining desired performance can be provided by communicating with the plurality of base stations. Therefore, the base station arrangement interval can be widened compared with the case where the base station arrangement is performed so as to obtain a desired performance in communication with one base station, so that the coverage of one base station is increased. Therefore, it is possible to provide a low-cost wireless system.
  • the present invention disclosed in this specification is not limited to the invention of the wireless communication system, the wireless communication method, and the wireless communication control device described in the claims, and includes various other inventions.
  • the invention of the terminal device as an example is as follows.
  • a terminal apparatus that moves within a predetermined range and performs radio communication with a plurality of base stations, an antenna, a radio transmission / reception unit capable of communicating with the plurality of base stations, and the plurality of bases via the antenna
  • a wireless communication management unit for managing wireless transmission / reception by a wireless transmission / reception unit capable of communicating with a station, wherein the wireless communication management unit is one or more of the plurality of base stations depending on the position of the terminal.
  • a terminal device that returns an acknowledgment when a signal from at least one of the base stations is correctly received.
  • control device 2 wireless communication control devices 3, 4, 5, 6: base station 7: terminal 8, 9: wireless transmission / reception unit 10: wireless communication management unit 20: operation control unit 21: movement control units 22, 30, 31, 400: Wired interfaces 23, 32, 402, 707: Bus 24: Operation determination unit 25: Operation number table holding unit 26: Signal generation unit 27: Transmission signal control unit 28: Movement determination unit 29: Position information signal generation Transmitter 271: Response signal collection unit 272: Retransmission determination unit 273: Output designation unit 274: Signal holding unit 275: Transmission scheduled signal holding unit 276: Already transmitted signal holding unit 33: Connection control unit 34: Position calculation unit 35: Operation determination unit 36: Control table holding unit 37: Operation instruction signal generation unit 401: base station wireless transmission / reception units 403, 700, 701: antennas 702, 703: wireless transmission / reception unit 704: wireless communication management unit 705: communication quality management unit 706: operation response unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2012/065790 2012-06-20 2012-06-20 Système de communication sans fil, procédé, et dispositif Ceased WO2013190672A1 (fr)

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JP2014521160A JP5925310B2 (ja) 2012-06-20 2012-06-20 無線通信システム、方法、及び装置
PCT/JP2012/065790 WO2013190672A1 (fr) 2012-06-20 2012-06-20 Système de communication sans fil, procédé, et dispositif

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