JP2012239110A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit and receive data using plural radio transmission paths with different frequencies.SOLUTION: The radio communication device comprises a wired side data processing part 101, plural multiplex parts 102, 103, transmission parts 104, 105 transmitting radio frames that have been multiplexed by the corresponding multiplex parts 102, 103 via different frequency signals, and a control part 110 for controlling an operation of the wired side data processing part 101. The control part 110 controls the operation of the wired side data processing part 101 to transmit the same data extracted from the data received from a wired transmission path to the respective multiplex parts 102, 103 when a bit error rate of a radio transmission path is not less than a threshold, and controls the operation of the wired side data processing part 101 to transmit the different data extracted from the data received from the wired transmission path to the respective multiplex parts 102, 103 when the bit error rate of the radio transmission path is less than the threshold.

Description

  The present invention relates to a wireless communication apparatus. In particular, the present invention relates to a wireless communication apparatus that transmits and receives data using a plurality of wireless transmission paths having different frequencies.

  A known wireless communication device that makes transmission data redundant transmits a signal using one of two different frequency wireless transmission lines as a main transmission line, and always simultaneously transmits it to the other transmission line. The same signal is transmitted. By adopting such a configuration, when any failure occurs in the main transmission line, the other transmission line can be switched as the main transmission line and transmission can be continued.

  Similarly, other known wireless communication devices that use wireless transmission paths of two frequency bands transmit data differently to each other by transmitting different signals to each other's transmission paths. Can be sent.

  Patent Document 1 describes a data transmission system that uses a module for transmitting and receiving digital data. The data transmission system described in Patent Document 1 connects a plurality of communication modules of the same format, and transmits using a plurality of communication modules according to data to be transmitted.

JP 2010-124163 A

  However, a known wireless communication device that makes transmission data redundant has a low frequency of using a protection line when a failure occurrence frequency of the main transmission path is low. Therefore, there is a problem that there is a high possibility that the frequency band serving as the protection line is wasted. In addition, known wireless communication devices that transmit different data simultaneously can cause data loss and significant transmission delay when a failure occurs in the wireless transmission path of one frequency band and transmission becomes impossible. is there.

  Further, the technique described in Patent Document 1 transmits different data to a plurality of frequencies regardless of the transmission line status when transmitting a large amount of data. May cause delay.

  In order to solve the above-described problem, according to the first aspect of the present invention, a wireless communication apparatus that transmits and receives data using a plurality of wireless transmission paths having different frequencies, the data being transmitted and received with respect to a wired transmission path A wired-side data processing unit for processing, a plurality of multiplexing units for multiplexing the payload data extracted by the wired-side data processing unit into a wireless frame, and a corresponding multiplexing unit A transmission unit that transmits the radio frame after being subjected to multiple processing on different frequency signals, and a control unit that controls the operation of the wired data processing unit. If the rate is equal to or greater than the threshold value, the operation of the wired data processing unit is controlled so that the same data extracted from the received data from the wired transmission channel is sent to each multiplexing unit, and the code error rate of the wireless transmission channel is reduced. Less than threshold If, in order to send different data extracted from the received data from the wired transmission path to the multiplexing section respectively, for controlling the operation of the wire-side data processing unit.

  In addition, as described above, the summary of the invention does not enumerate all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  As is apparent from the above description, when the code error rate of the wireless transmission path is low, the present invention can effectively use the frequency band to increase the output amount of data to be transmitted. In addition, according to the present invention, when the frequency of failure in a wireless transmission path is high, data loss and transmission delay can be reduced when one of the transmission paths is disconnected.

It is a figure showing an example of communications system 1 concerning one embodiment. FIG. 3 is a diagram illustrating an example of a configuration example of a radio frame that is transmitted and received by the radio communication device 100. 6 is a diagram illustrating an example of transmission method determination processing in a wireless circuit control unit 110. FIG.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the invention according to the scope of claims, and are combinations of features described in the embodiments. Not all are essential to the solution of the invention.

  FIG. 1 shows an example of a communication system 1 according to an embodiment. The communication system 1 includes two wireless communication devices 100a and 100b (hereinafter collectively referred to as the wireless communication device 100). The wireless communication device 100 transmits and receives data using wireless transmission paths of two different frequencies.

  The wireless communication device 100a includes a wired data processing unit 101a, two wireless circuit multiplexing units 102a and 103a, two wireless transmission units 104a and 105a, two wireless reception units 106a and 107a, and two wireless circuit extraction units 108a and 109a. , A wireless circuit control unit 110a, and four antennas 111a to 114a.

  Here, the internal structures of the wireless communication device 100a and the wireless communication device 100b in FIG. 1 are the same.

  The wired data processing unit 101 transmits and receives wired signals. The radio circuit multiplexing units 102 and 103 multiplex signals from the wired side. Radio transmission sections 104 and 105 modulate baseband signals into radio signals. Radio receiving sections 106 and 107 demodulate radio signals into baseband signals. Radio circuit extraction sections 108 and 109 extract multiplexed signals. The wireless circuit control unit 110 transmits a control signal or overhead data to the wired data processing unit 101 and the wireless circuit multiplexing units 102 and 103. The antennas 111 and 112 transmit radio signals. The antennas 113 and 114 receive radio signals.

  Here, the configuration of a radio frame for transmitting and receiving with the facing radio communication apparatus 100 will be described with reference to FIG. Both the transmission frame and the reception frame have the same configuration, and can be broadly divided into an overhead part that is a control information part and a data part that is a data part to be transmitted and received. As shown in FIG. 2, the overhead section is composed of transmission method information and transmission line information. The transmission method information is information indicating the transmission method of the wireless communication apparatus on the transmission side, that is, a transmission method (hereinafter referred to as 1 + 1) that transmits two identical data using wireless transmission paths of two different frequencies. )) Or a transmission method (hereinafter referred to as 2 + 0) that transmits two different data using wireless transmission paths of two different frequencies.

  The transmission line information is code error rate (BER) information of the transmission line of the radio communication apparatus 100 facing the transmission line information.

  LAN data received from the wired side is processed by the wired side data processing unit 101, and payload data is extracted and transmitted to the wireless circuit multiplexing units 102 and 103. At this time, the wired-side data processing unit 101 selects which of 2 + 0 and 1 + 1 is used according to the transmission control signal from the wireless circuit control unit 110. In the case of the 2 + 0 configuration, the payload data transmitted to the radio circuit multiplexing units 102 and 103 is the same data, and in the case of the 1 + 1 configuration, the data is different. The radio circuit multiplexing units 102 and 103 multiplex the payload data transmitted from the wired-side data processing unit 101 into the data unit of the radio frame, and transmit the transmission line information and transmission method information received from the radio circuit control unit 110 as an overhead unit. The wireless signals are output to the wireless transmission units 104 and 105 as wireless frame data, and the wireless signals modulated by the wireless transmission units 104 and 105 are transmitted from the antennas 111 and 112 to the opposite wireless communication apparatus 100. The radio circuit multiplexing units 102 and 103 and subsequent processes are performed by two separate circuits.

  Two-line radio signals transmitted from the antennas 111 and 112 of the opposite radio communication apparatus 100 are received from the antennas 113 and 114 of the local station and transmitted to the radio reception units 106 and 107. The radio frame data demodulated by the radio reception units 106 and 107 is transmitted to the radio circuit extraction units 108 and 109. The radio circuit extraction units 108 and 109 first separate the overhead of the radio frame added by the opposite radio communication apparatus 100 and detect the error code of the radio frame data, and the radio circuit control unit 110 as overhead data and error code information. Send to. In addition, the wireless circuit extraction units 108 and 109 extract data multiplexed in the data part of the wireless frame and transmit it to the wired data processing unit 101. The wired-side data processing unit 101 multiplexes one of the data transmitted from the wireless circuit extraction units 108 and 109 into a wireless frame in the case of a 1 + 1 configuration in accordance with the reception data control signal from the wireless circuit control unit 110 and transmits it as LAN data on the wired side. In the case of the 2 + 0 configuration, both data are multiplexed into a wireless frame and transmitted as LAN data to the wired side.

  The radio circuit control unit 110 calculates the code error rate (BER) of the transmission line of the radio communication apparatus 100 from the error code information transmitted from the radio circuit extraction units 108 and 109, and transmits it to the radio circuit multiplexing unit 102 as transmission line information. It is transmitted and multiplexed on the overhead of the radio frame to be transmitted to the opposite radio communication apparatus 100. The transmission line information multiplexed on the overhead of the radio frame is extracted by the radio circuit control unit 110 of the opposite radio communication apparatus 100. When the transmission method of the wireless communication apparatus 100 is determined based on the transmission line information and the transmission method is changed, the transmission control signal is transmitted to the wired data processing unit 101 and the wireless line multiplexing units 102 and 103. The radio circuit control unit 110 also transmits transmission method information indicating the transmission method to the radio circuit multiplexing units 102 and 103 in order to transmit the current transmission method to the radio communication apparatus 100 that is opposed to the wireless communication apparatus 100. Multiplex. The transmission method information multiplexed on the radio frame overhead is extracted by the radio circuit control unit 110. Based on the transmission method information, it is determined whether the wireless frame data has a 1 + 1 configuration or a 2 + 0 configuration, and a reception data control signal is transmitted to the wired-side data processing unit 101.

  In the above, the switching method of the wireless transmission method of the facing wireless communication device 100 according to the state of the transmission line of the facing wireless communication device 100 has been shown, but the configurations of the wireless communication device 100a and the wireless communication device 100b are the same. The method of switching the wireless transmission method of the wireless communication device 100a according to the transmission line status of the wireless communication device 100a is the same as described above.

  With reference to FIG. 3, a method of determining a transmission method in the radio circuit controller 110 will be described. FIG. 3 is a flowchart for explaining transmission method determination processing in the radio circuit controller 110.

  When the current transmission method in the wireless communication apparatus 100 is 2 + 0 (S101: different data transmission), the transmission method is determined as follows.

  The radio circuit control unit 110 determines whether or not the code error rate (BER) value included in the overhead data transmitted from the radio circuit extraction units 108 and 109 is equal to or greater than a preset transmission method switching threshold ( S102).

  If the value of the transmission line BER is equal to or greater than the transmission method switching threshold (S102: Yes), it is determined whether or not the transmission line BER has continued for a preset protection time (S103).

  If it continues for more than the protection time (S103: Yes), the transmission method 1 + 1 is selected (S104). In addition, a transmission control signal for switching the transmission method is transmitted to the wired side data processing unit 101 and the wireless line multiplexing units 102 and 103 (S108).

  If the determinations in steps S101 and S102 are NO, the current transmission method is maintained, and switching to 1 + 1 is not performed.

  When the current transmission method in the wireless communication apparatus 100 is 1 + 1 (S101: same data transmission), the transmission method is determined as follows.

  Radio circuit control section 110 determines whether or not the value of code error rate BER included in the overhead data transmitted from radio circuit extraction sections 108 and 109 is less than a preset transmission method switching threshold ( S105).

  It is determined whether or not the value of the transmission line BER is less than the transmission method switching threshold value (S105: Yes) and it has continued for a preset protection time (S106).

  If it continues for the protection time or longer (S106: Yes), the transmission method 2 + 0 is selected (S107). In addition, a transmission control signal for switching the transmission method is transmitted to the wired side data processing unit 101 and the wireless line multiplexing units 102 and 103 (S108).

  If the determination in steps S105 and S106 is NO, the current transmission method is maintained, and switching to 2 + 0 is not performed.

  In the present invention, when the failure occurrence frequency of the wireless transmission path is low, the frequency band can be used effectively and the output amount of data can be increased. In addition, when the frequency of failure in the wireless transmission path is high, it is possible to reduce data loss and transmission delay when one of the transmission paths is disconnected.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Communication system 100 Wireless communication apparatus 101 Wired side data processing part 102 Wireless circuit multiplexing part 103 Wireless circuit multiplexing part 104 Wireless transmission part 105 Wireless transmission part 106 Wireless reception part 107 Wireless reception part 108 Radio circuit extraction part 109 Wireless circuit extraction part 110 Radio circuit controller 111 Antenna 112 Antenna 113 Antenna 114 Antenna

Claims (3)

A wireless communication device that transmits and receives data using wireless transmission paths of different frequencies,
A wired-side data processing unit that processes data to be transmitted to and received from the wired transmission path;
A plurality of multiplexing units for multiplexing the payload data extracted by the wired side data processing unit into a radio frame;
A transmission unit provided in one-to-one correspondence with each of the multiplexing units and transmitting the radio frame after the corresponding multiplexing unit performs a multiplexing process on different frequency signals;
A control unit for controlling the operation of the wired data processing unit,
When the code error rate of the wireless transmission path is equal to or greater than a threshold value, the control section is configured to send the same data extracted from the received data from the wired transmission path to each multiplexing section. When the code error rate of the wireless transmission path is less than a threshold value, the wired-side data is sent to each of the multiplexing units to send different data extracted from the received data from the wired transmission path. A wireless communication apparatus that controls an operation of a processing unit. An extraction unit for extracting data from the received data from the wireless transmission path;
The radio communication apparatus according to claim 1, wherein the control unit compares a code error rate indicated by the data extracted by the extraction unit with a threshold value. The control unit, when controlling the operation of the wired data processing unit to change the way of sending data to each multiplexing unit, controls after a preset time has elapsed. The wireless communication device according to 1 or 2.

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