WO2010090205A1 - 無線伝送方法および無線伝送装置 - Google Patents
無線伝送方法および無線伝送装置 Download PDFInfo
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- WO2010090205A1 WO2010090205A1 PCT/JP2010/051482 JP2010051482W WO2010090205A1 WO 2010090205 A1 WO2010090205 A1 WO 2010090205A1 JP 2010051482 W JP2010051482 W JP 2010051482W WO 2010090205 A1 WO2010090205 A1 WO 2010090205A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
Definitions
- the present invention relates to a wireless transmission system for mutually transmitting a LAN (Local Area Network) signal received from a user network between two wireless transmission devices connected to the user network.
- LAN Local Area Network
- External LAN signal 100 (IEEE802.3-compliant MAC (Media Access Control) frame) from the user network 10 is input to the layer 2 switch (L2SW) 50.
- L2SW50 distributes external LAN signal 100 for each MAC frame and distributes as LAN signals 110-1, 110-2,..., 110-n, wireless transmission devices 60-1, 60-2,. To each output.
- the wireless transmission devices 60-1, 60-2,..., 60-n wirelessly modulate the input sorting LAN signals 110-1, 110-2,.
- the radio signals 201-1, 201-2,..., 201-n are output to the transmission devices 70-1, 70-2,.
- the wireless transmission devices 70-1, 70-2,..., 70-n demodulate the received wireless signals 201-1, 201-2,.
- Signals 510-1, 510-2,..., 510-n are output to L2SW80.
- the L2SW 80 bundles the distribution LAN signals 510-1, 510-2,..., 510-n and outputs them to the user network 40 as the external LAN signal 500.
- the wireless transmission devices 70-1, 70-2,..., 70-n wirelessly modulate the input sorting LAN signals 110-1, 110-2,. , 60-n are output as radio signals 601-1, 601-2,..., 601-n to the transmission devices 60-1, 60-2,.
- a LAN signal is transmitted in the same way from the user network 40 to the user network 10. Therefore, in the wireless transmission system shown in FIG. 1, the transfer capacity can be increased by increasing the number of wireless transmission devices between L2SW50 and L2SW80.
- L2SW50 and L2SW80 have a link aggregation function without LACP (Link Aggregation Control Protocol) as described in Patent Document 1.
- LACP Link Aggregation Control Protocol
- L2SW50 in FIG. 1 is L2SW50-1, L2SW50-2,..., L2SW50-n
- L2SW80 in FIG. 1 is L2SW80-1, L2SW80-2,.
- Each wireless transmission device 60-1, 60-2,..., 60-n, 70-1, 70-2,..., 70-n is connected, and each wireless transmission device is connected in a star shape.
- the LAN signal 100 from the user network 10 is L2SW50-1 of the first-stage wireless transmission device 60-1, and is distributed to n for each MAC frame, and one (110-1) goes to the wireless transmission device 60-1 side.
- n-1 (110-2 to 110-n) are output to the adjacent n-1 wireless transmission devices 60-2 to 60-n.
- L2SW80-1 of wireless transmission device 70-1.
- a wireless transmission device connected to a user network and a plurality of adjacent wireless transmission devices are connected in a star shape to connect to the user network.
- a plurality of wireless transmission paths can be aggregated by the wireless transmission device, and the transmission capacity can be increased by the number of adjacent wireless transmission devices.
- the wireless transmission device notifies the L2SW of the abnormality by linking down the internal LAN signal port that is a connection terminal between the L2SWs. Since the L2SW does not use a link-down port for signal transmission because of the link aggregation function, signal transmission using only a wireless transmission device of a normal wireless transmission path is possible.
- connections from a plurality of adjacent wireless transmission devices are concentrated on the wireless transmission device connected to the user network, so interfaces are required for the number of adjacent wireless transmission devices. Therefore, there is a problem that it is difficult to reduce the size and cost of the apparatus. Further, since the adjacent wireless transmission device is only connected to the wireless transmission device connected to the user network, the L2SW function is necessary, and it is difficult to reduce the cost of the device. Even if the L2SW function is omitted from adjacent wireless transmission devices, different types of wireless transmission devices are handled together, which causes a problem of complicated installation work and maintenance.
- the wireless transmission system of FIG. 3 shows a wireless transmission system having the same internal configuration as the wireless transmission system of FIG. That is, the wireless transmission system in FIG. 3 connects the wireless transmission device 60-1 connected to the user network 10 with the adjacent wireless transmission device 60-2, and the wireless transmission device 70-1 adjacent to the wireless transmission device 70-1. 2, wireless transmission device 60-2 and adjacent wireless transmission device 60-3 are connected, wireless transmission device 70-2 and adjacent wireless transmission device 70-3 are connected, and so on.
- a wireless transmission device is connected in cascade.
- adjacent wireless transmission devices are connected in cascade to bundle a plurality of wireless transmission paths and to increase the transmission capacity according to the number of wireless transmission devices.
- the wireless transmission system of FIG. 3 detects an abnormality in the wireless transmission path and the wireless transmission device, and notifies the abnormality to the L2SW by linking down the internal LAN signal port that is connected to the L2SW. Since the L2SW does not use a link-down port for signal transmission because of the link aggregation function, signal transmission can be continued using only a wireless transmission device on a normal wireless transmission path.
- the wireless transmission system of FIGS. 2 and 3 is an integrated system, if an abnormality occurs in the wireless transmission path or the wireless transmission device, the internal LAN signal port link down to the L2SW block of the own wireless transmission device It is necessary to notify in the form. For this reason, it is difficult to increase the control speed compared to the method in which the LAN port outside the apparatus is directly linked down.
- An object of the present invention is to provide a radio transmission method and a radio transmission apparatus capable of easily expanding a transmission capacity without changing a radio modulation scheme or a radio band.
- the input signal is distributed by the first wireless transmission device, one signal is transmitted to the second wireless transmission device facing the first wireless transmission device, and the other signal is transmitted to the first wireless transmission device. Output to the adjacent third wireless transmission device. Further, the data is transmitted to the second wireless transmission device adjacent to the fourth wireless transmission device via the fourth wireless transmission device facing the third wireless transmission device. Signals received from each of the first and fourth wireless transmission devices are aggregated and output by the second wireless transmission device.
- the wireless transmission capacity according to the number of wireless transmission devices it is possible to expand the wireless transmission capacity according to the number of wireless transmission devices to be combined without changing the wireless modulation method or the wireless band.
- the reason is that the signals received from the user network are distributed and transmitted to the adjacent wireless transmission device using the wireless transmission path of the adjacent wireless transmission device of the own wireless transmission device group, and also in the adjacent wireless transmission device.
- By distributing the signals and transmitting the signals extracted from the received wireless signals to each wireless transmission device of the counterpart wireless transmission device group it is possible to aggregate the wireless transmission paths, and the transmission capacity according to the number of wireless transmission devices This is because it becomes possible to expand the number of
- the second effect is that, in each wireless transmission device group, all the wireless transmission devices can have the same configuration, and the wireless transmission device can be reduced in size and price.
- the reason is that, in the above-described wireless transmission device, a plurality of wireless transmission devices are connected in cascade, so that each device only needs to have a branch port for connecting to an adjacent device. This is because no interface is required for the number of devices.
- FIG. 1 is a block diagram of a conventional example of a wireless transmission system.
- FIG. 2 is a block diagram of another conventional example of a wireless transmission system.
- FIG. 3 is a block diagram of still another conventional example of the wireless transmission system.
- FIG. 4 is a block diagram of the wireless transmission system according to the first embodiment of this invention.
- FIG. 5 is a block diagram of a wireless transmission system according to the second embodiment of this invention.
- FIG. 6 is a table showing the control logic of the external LAN port link of the radio network controller.
- FIG. 7 is a table showing the control logic of the external LAN port link of the n-th stage wireless control device.
- FIG. 8 is a table showing the control logic of the branch LAN port link of the radio network controller.
- FIG. 9 is a block diagram of a wireless transmission system according to the third embodiment of this invention.
- FIG. 10 is a block diagram of a wireless transmission system according to the fourth embodiment of this invention.
- FIG. 4 is a block diagram of the wireless transmission system according to the first embodiment of the present invention.
- the wireless transmission system includes a cascade transmission wireless device 20-1 or 20-2 connected to the user network 10 on the own station side, and a cascade on the opposite station side connected to the user network 40. It consists of connected wireless transmission devices 30-1 and 30-2.
- the wireless transmission device 20-1 includes a distribution circuit 21, a transmission circuit 22, a reception circuit 23, a control circuit 24, an external LAN port 25, and a branch LAN port 26.
- the wireless transmission device 20-2 includes a distribution circuit 21, a transmission circuit 22, a reception circuit 23, a control circuit 24, and an external LAN port 25.
- the wireless transmission device 30-1 has the same configuration as the wireless transmission device 20-1, and includes a distribution circuit 31, a transmission circuit 32, a reception circuit 33, a control circuit 34, an external LAN port 35, and a branch LAN port 36.
- the wireless transmission device 30-2 has the same configuration as the wireless transmission device 20-2, and includes a distribution circuit 31, a transmission circuit 32, a reception circuit 33, a control circuit 34, and an external LAN port 35.
- the signals 500, 501, and 502 in the wireless transmission devices 30-1 and 30-2 correspond to the signals 100, 101, and 102 in the wireless transmission devices 20-1 and 20-2, respectively.
- the signal 601 in the wireless transmission devices 30-1 and 30-2 corresponds to the signal 201 in the wireless transmission devices 20-1 and 20-2.
- the signals 701 and 702 in the wireless transmission devices 30-1 and 30-2 correspond to the signals 301 and 302 in the wireless transmission devices 20-1 and 20-2, respectively.
- the signals 801 and 802 in the wireless transmission devices 30-1 and 30-2 correspond to the signals 401 and 402 in the wireless transmission devices 20-1 and 20-2, respectively.
- the distribution circuit 21 in the wireless transmission device 20-1 receives the external LAN signal 100 from the user network 10 from the external LAN port 25, distributes it in frame units, and transmits the transmission signal 101 to the transmission circuit 22 in the wireless direction. As a distributed LAN signal 101 to the adjacent wireless transmission device 20-2. Further, the distribution circuit 21 outputs the link state of the external LAN port 25 and the branch LAN port 26 to the control circuit 24 as the link state notification signal 103. In addition, the distribution circuit 21 performs link-down control of each port of the external LAN port 25 and the branch LAN port 26 according to the link control signal 401 input from the control circuit 24 and the transmission signal 101 that is output in the wireless direction. Stop. In addition, the distribution circuit 21 aggregates the reception signal 301 input from the reception circuit 23 and the distribution LAN signal 102 input from the adjacent wireless transmission device 20-2 and outputs the aggregated LAN signal 102 to the user network 10 as the external LAN signal 100.
- a method is used in which the frame is alternately distributed in the direction of the radio transmission device of the opposite station and the direction of the adjacent radio transmission device in units of frames.
- the IP header contains Using the result of applying a hash function to the IP address, it is also possible to classify into two directions: the direction of the radio transmission device of the opposite station and the direction of the adjacent radio transmission device.
- the distribution method is not particularly limited, and any distribution method can be applied.
- the transmission circuit 22 multiplexes the transmission signal 101 from the distribution circuit 21 and the alarm signal 402 from the control circuit 24, performs radio modulation, and outputs the radio signal 201 to the radio transmission apparatus 30-1 as the opposite station.
- the reception circuit 23 separates the reception signal 301 which is the main signal from the radio signal 601 from the radio transmission device 30-1 and outputs it to the distribution circuit 21.
- the reception circuit 23 also includes a signal indicating an abnormal state such as a decrease in the reception level of the wireless signal 601 from the wireless transmission device 30-1 or the occurrence of a signal error, and an alarm in the wireless transmission device 30-1 separated from the wireless signal 601.
- the signal 802 is multiplexed and output to the control circuit 24 as a transfer alarm signal 302.
- the control circuit 24 includes a link state notification signal 103 indicating the link state between the external LAN port 25 and the branch LAN port 26 from the distribution circuit 21, and a transfer alarm signal indicating deterioration in the quality of the radio signal 601 from the reception circuit 23. 302 is multiplexed and output to the transmission circuit 22 as an alarm signal 402.
- control circuit 24, based on the transfer alarm signal 302 from the receiving circuit 23, is notified by the own wireless transmission device and the wireless opposite wireless transmission device, the quality deterioration of the wireless signals 201, 601 and the external LAN ports 25, 35,
- link-down state of the branch LAN ports 26 and 36 is detected, and the link control of each port 25 and 26 and the abnormality of the radio signals 201 and 601 are detected according to the link control logic shown in FIGS.
- a link control signal 401 for stopping the transmission signal 201 that is output to the opposite station is output to the distribution circuit 21.
- the wireless transmission device 20-1 and the wireless transmission device 20-2 adjacent to the wireless transmission device 20-1 are connected to the branch LAN port 26 of the wireless transmission device 20-1 and the external LAN port 25 of the wireless transmission device 20-2 by the distribution LAN signal 102. Is done.
- the radio transmission device 30-1 that is the opposite station and the radio transmission device 30-2 adjacent thereto are similarly branched LAN port 36 of the radio transmission device 30-2 and external LAN port of the radio transmission device 30-2. 35 are connected by distribution LAN signal 502.
- the LAN signals are allocated and aggregated in units of frames within the own wireless transmission device, so that not only the wireless transmission path of the own wireless transmission device but also the wireless of the adjacent wireless transmission device
- the LAN signal can be transmitted using the transmission path, and the transmission capacity can be increased according to the number of wireless transmission apparatuses without changing the wireless modulation method or the wireless band.
- FIG. 5 is a block diagram of a wireless transmission system according to the second embodiment of the present invention.
- the wireless transmission system according to the present embodiment is connected to the user network 10 and connected to the user network 40 by the cascade-connected wireless transmission devices 20-1, 20-2,. , 30-n, which are cascade-connected radio transmission apparatuses 30-1, 30-2,.
- n is an integer of 3 or more.
- the wireless transmission devices 20-1,..., 20- (n-1) have the same configuration, and the wireless transmission device 20-n has the same configuration as the wireless transmission device 20-2 in FIG.
- the wireless transmission device 30-1, ..., 30- (n-1) has the same configuration as the wireless transmission device 20-1, ..., 20- (n-1), and the wireless transmission device 30-n
- the configuration is the same as that of the wireless transmission device 30-2 in FIG.
- wireless transmission device 20-1 When wireless transmission device 20-1 is set as its own station, 1)) The external LAN port 35 of the wireless transmission device 30-1 that is the opposite station is in a link-down state (case 1 in FIG. 6), 2) The deterioration of the quality of the radio signal 201 of the local station is detected, and the branch LAN port 26 of the local station is in the link down state (case 2 in FIG. 6), 3) The quality deterioration of the radio signal 201 of the own station is detected, and the branch LAN port 36 of the radio transmission device 30-1 which is the opposite station is in the link down state (case 3 in FIG. 6).
- the branch LAN ports 26 and 36 are not used, the external LAN ports 25 and 35 are linked down if an error occurs in the received signal in both the local station and the opposite station.
- link-up control is performed on the external LAN ports 25 and 35.
- the control logic of the external LAN port link of the wireless transmission device 20-2, ..., 20- (n-1), 30-1, ..., 20- (n-1) is also the same as that of the wireless transmission device 20-1.
- the external LAN port 25 of the wireless transmission device 20-2 is linked down (see FIG. 7 case 1).
- an abnormality of the reception signal 601 is detected in the wireless transmission apparatus 20-2 of the own station (case 2 in FIG. 7), or when an abnormality of the reception signal 201 is activated in the wireless transmission apparatus 30-2 of the opposite station (FIG. 7).
- the external LAN ports 25 and 35 of the radio transmission apparatuses 20-2 and 30-2 of the own station and the opposite station are linked down.
- the external LAN ports 25 and 35 are linked up.
- the external LAN port link control logic of the wireless transmission device 30-2 is the same as that of the wireless transmission device 20-2.
- branch LAN port link control logic will be described with reference to FIG. 4 and FIG. In FIG. 8, “-” is “don't care”.
- the stop logic of the transmission signal 101 which is the output to the opposite station, is the same in all wireless transmission devices even in the n-stage configuration shown in FIG.
- the transfer alarm signal 302 Stop output of signal 101.
- the signal transmission operation of the wireless transmission system is performed normally, when a wireless signal abnormality occurs, when an external LAN port link down occurs, when a branch LAN port link down occurs, and when a radio signal abnormality and port link down occur This will be described separately when the two occur simultaneously.
- the wireless transmission device 20-1 transmits the external LAN signal 100 from the user network 10 in the direction of the wireless transmission device 30-1 that is the opposite station in the distribution circuit 21, and the adjacent wireless transmission device 20 -2 is distributed for each MAC frame in the direction of -2, and is transmitted as a transmission signal 101 in the wireless direction and as a distributed LAN signal 102 in the direction of the adjacent wireless transmission device.
- the transmission signal 101 in the wireless direction is input to the distribution circuit 31 as the reception signal 701 through the transmission circuit 22 and the reception circuit 33 of the wireless transmission device 30-1.
- the distribution LAN signal 102 is output as the transmission signal 101 in the distribution circuit 21 of the wireless transmission device 20-2, and is distributed as the reception signal 701 via the transmission circuit 22 and the reception circuit 33 of the wireless transmission device 30-2.
- the signal is input to the circuit 31 and input to the distribution circuit 31 in the wireless transmission device 30-1 as the distribution LAN signal 502.
- the distribution circuit 31 aggregates the reception signal 701 from the wireless direction and the distribution LAN signal 502 from the adjacent wireless transmission device 30-2, and outputs it to the user network 40 as the external LAN signal 500.
- the wireless transmission system of this embodiment can be easily expanded without changing the wireless modulation scheme and the wireless band by combining with the adjacent wireless transmission device.
- the control circuit 24 detects the above state by the transfer alarm signal 302 from the reception circuit 23 and controls the distribution circuit 21.
- the signal 401 is output and the output of the transmission signal 101 to the transmission circuit 22 is stopped.
- the control circuit 24 notifies the wireless transmission device 30-1 of the deterioration of the quality of the wireless signal 601 via the transmission circuit 22 by the alarm signal 402.
- the reception warning signal 702 is separated from the wireless signal 201 in the reception circuit 33 and input to the control circuit 34.
- the wireless transmission device 30-1 detects the occurrence of deterioration in the quality of the wireless signal 601, outputs the control signal 801 to the distribution circuit 31, and stops the output of the transmission signal 501 to the transmission circuit 32. Further, the distribution circuits 21 and 31 transfer all LAN signals from the external LAN ports 25 and 35 to the branch LAN ports 26 and 36, respectively. Thereby, it is possible to stop only signal transmission with an abnormal radio signal and continue signal transmission with a radio transmission apparatus of normal radio signals.
- the operation when the deterioration of the quality of the radio signal 201 is detected by the reception circuit 33 of the radio transmission device 30-1 is that the relationship between the radio transmission devices 20-1 and 30-1 is just opposite to the above, It is the same.
- the branch LAN ports 26 and 36 are not connected and are always in a link-down state. Therefore, using the wireless transmission devices 20-2 and 30-2 in FIG. 4, when quality deterioration occurs in the wireless signals 201 and 601 between the wireless transmission devices 20-2 and 30-2, wireless transmission is performed. The same method as the devices 20-1 and 30-1 detects the quality deterioration, stops the transmission signal, and notifies the radio transmission device of the opposite station. In addition, the external LAN ports 25 and 35 are linked down according to the external LAN port link control logic (cases 2 to 3) shown in FIG.
- the branch LAN ports 26 and 36 of the first-stage wireless transmission devices 20-1 and 30-1 are also in the link-down state, and the first-stage wireless transmission devices 20-1 and 30-1 Signal transmission between the second-stage radio transmission apparatuses 20-2 and 30-2 is stopped.
- the wireless transmission devices 20-1 to 20- (n ⁇ 1), 30-1 of the 1st to n ⁇ 1 stages are used.
- ⁇ 30- (n-1) the transmission signal in the wireless direction is stopped at the own station and the opposite station, and all the LAN signals from the external LAN ports 25 and 35 are transferred to the branch LAN port. Only the signal transmission by the signal is stopped, and the signal transmission can be continued by using the normal wireless signal wireless transmission device.
- wireless transmission devices 20-n and 30-n in addition to stopping transmission signals in the opposite station direction, link-down control is performed on the external LAN ports 25 and 35, so that the wireless transmission path / wireless transmission device It is possible to prevent the frame loss of the LAN signal from continuing to occur due to the abnormality, and to continue the signal transmission using the normal wireless signal wireless transmission device up to the previous stage.
- the 1st to n-th stage wireless transmission devices 20-1 to 20-n , 30-1 to 30-n all perform the same operation, and will be described with reference to the wireless transmission devices 20-1 and 30-1 in FIG.
- the control circuit 24 detects the link-down state from the link state notification signal 103 from the distribution circuit 21, and the branch LAN port in case 1 in FIG. A result of determining that the link is down according to the link control logic is output as a link control signal 401.
- the distribution circuit 21 links down the branch LAN port 26 based on the link control signal 401.
- the control circuit 24 notifies the radio transmission apparatus 30-1 of the opposite station of the link down state of the external LAN port 25 via the transmission circuit 22.
- the control circuit 34 detects the link-down state of the external LAN port 25 of the wireless transmission device 20-1 based on the transfer alarm signal 702 separated from the wireless signal 201 in the reception circuit 33.
- the link control determination result based on the link control logic of case 1 in FIG. 6, case 1 in FIG. 7, and case 2 in FIG. 8 is output to the distribution circuit 31 as a link control signal 801.
- the distribution circuit 31 links down the external LAN port 35 and the branch LAN port 36 based on the link control signal 801.
- the operation when the link down state occurs in the external LAN port 35 of the wireless transmission device 30-1 is the same as the above, except that the relationship between the wireless transmission devices 20-1 and 30-1 in the operation description is reversed. It is the same.
- the link down control of the external LAN port of the opposite station wireless transmission device and the wireless transmission device of the own station and the opposite station are performed.
- the link of the branch LAN port By stopping the link of the branch LAN port, the signal transmission with the wireless transmission device in the previous stage and the wireless transmission device in the subsequent stage is stopped, and the signal transmission is continued only with the wireless transmission device in which the link state up to the previous stage is normal It becomes possible to do.
- the control circuit 24 detects the link down state from the link state notification signal 103 in the same way as the external LAN port 25 described above, and the transmission circuit 22, This is notified to the control circuit 34 via the reception circuit 33 of the transmission device 30-1.
- the control circuit 34 detects the link-down state of the branch LAN port 26 of the wireless transmission device 20-1, and outputs the link control determination result as the link control signal 801 according to the branch LAN port link control logic of case 3 in FIG. Output to the divider circuit 31.
- the distribution circuit 31 performs link-down control of the branch LAN port 36 based on the link control signal 801.
- Radio signal quality deterioration and external LAN port link down Operation when an external LAN port link down occurs while wireless signal quality deterioration is detected is the same as the above-mentioned external LAN port link down. Therefore, explanation is omitted.
- the radio transmission device 20 is the same as the above-mentioned ⁇ Degradation of radio signal quality> or ⁇ Link down of the branch LAN port>.
- -1 detects the state, and outputs a result of link control determination according to the control logic of case 2 in FIG. 6 to the distribution circuit 21 as a link control signal 401.
- the distribution circuit 21 links down the external LAN port 25 based on the link control signal 401.
- the control circuit 24 notifies the control circuit 34 via the transmission circuit 22 and the reception circuit 33 of the wireless transmission device 30-1 of the deterioration of the quality of the wireless signal 201 and the link-down state of the branch LAN port 26.
- the control circuit 34 outputs the result of the link control determination according to the control logic of case 5 in FIG. 6 to the distribution circuit 31 as the link control signal 801.
- the distribution circuit 31 links down the external LAN port 35 and the branch LAN port 36 based on the link control signal 801.
- the signal in the subsequent wireless transmission device connected to the wireless transmission device and the branch LAN port Judging that transmission is impossible, link down the external LAN port at the local station and the opposite station, stop signal transmission between the wireless transmission device and the subsequent devices, and use only normal wireless transmission devices before the wireless transmission device. Signal transmission can be continued.
- the wireless transmission system of the first embodiment of FIG. 4 and the wireless transmission device of the wireless transmission system of the embodiment of FIG. 5 each have one system of transmission circuit and reception circuit.
- the wireless transmission device 20-1 in the wireless transmission system of this embodiment shown in FIG. 9 includes two transmission circuits 22a and 22b, two reception circuits 23a and 23b (the same applies to other wireless transmission devices). Have. Thereby, redundancy of the wireless transmission path is realized.
- the distribution circuit 21 of the wireless transmission device 20-1 distributes the external LAN signal 100 from the user network 20 to the transmission signal 101, which is a distribution signal of the opposite station, and the distribution of the adjacent wireless transmission device.
- the signal is distributed to the distribution LAN signal 102, which is a signal, and the transmission signal 101 is output to the transmission circuits 22a and 22b.
- the transmission circuits 22a and 22b multiplex the input transmission signal 101 and the alarm signal 402 from the control circuit 24, perform radio modulation, and output the radio signal 201 from one transmission circuit.
- the redundant system of the transmission circuit can be configured by switching to the other transmission circuit.
- the receiving circuits 23a and 23b receive the radio signal 601 from the opposite station, respectively, and after the radio demodulation, separate the transfer alarm signal 302 and the received signal 301.
- the separated signal is output from one receiving circuit. If a deterioration in the quality of a radio signal is detected by one receiving circuit due to an abnormality in a wireless transmission path or a wireless transmission device, the transfer alarm 302 is switched to the other receiving circuit that is receiving a normal received signal. By outputting the reception signal 301, a redundant system of the reception circuit can be configured.
- the redundancy of the wireless transmission path is merely an example, and there are many existing systems.
- the existing system and the wireless transmission apparatus of the present invention can be combined with any redundancy system of the wireless transmission path. It is.
- the distribution circuit 21 in the wireless transmission device 20-1 in FIG. 10 connects to the user network 10 through two external LAN ports 25 and 27.
- the control circuit 24 links down one of the external LAN ports based on the control signal 401, and performs signal transmission using only the other external LAN port. If a port that is transmitting signals due to a failure in the user network or cable and connector goes into a link down state, an abnormality is detected from the link state notification signal 103, and the link down of the other port is canceled. It is possible to restart signal transmission using a port other than the port that has been linked down due to an external factor.
- the branch LAN port for connection to the adjacent wireless transmission device is also made redundant with the branch LAN ports 26 and 28 in the same manner as the external LAN ports 25 and 27.
- an abnormality is notified to an adjacent wireless transmission device by performing link-down control on both branch LAN ports 26 and 28.
- the failure of the connection with the user network itself or the user network and the connection between adjacent wireless transmission devices It becomes possible to increase the tolerance to obstacles.
- 9 and 10 may be combined to make all the connections between the wireless transmission path, the user network, and the wireless transmission device redundant.
- the signal for wireless transmission may be other than LAN signals.
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Abstract
Description
20-1~20-n、30-1~30-n 無線伝送装置
21、31 振分回路
22、22a、22b、32 送信回路
23、23a、23b、33 受信回路
24、34 制御回路
25、27、35 外部LANポート
26、28、36 分岐LANポート
100、500 外部LAN信号
101、501 送信信号
102、502 振り分けLAN信号
103、503 リンク状態通知信号
201、601 無線信号
301、701 受信信号
302、702 転送警報信号
401、801 リンク制御信号
402、802 警報信号
図4は本発明の第1の実施形態による無線伝送システムのブロック図である。
図5は本発明の第2の実施形態による無線伝送システムのブロック図である。
1))対向局である無線伝送装置30-1の外部LANポート35がリンクダウン状態(図6のケース1)、
2)自局の無線信号201の品質悪化を検出し、かつ自局の分岐LANポート26がリンクダウン状態(図6のケース2)、
3)自局の無線信号201の品質悪化を検出し、かつ対向局である無線伝送装置30-1の分岐LANポート36がリンクダウン状態(図6のケース3)、
4)対向局である無線伝送装置30-1の無線信号601の品質悪化を検出し、かつ自局の分岐LANポート26がリンクダウン状態(図6のケース4)、
5)対向局である無線伝送装置30-1の無線信号601の品質悪化を検出し、かつ分岐LANポート36がリンクダウン状態(図6のケース5)の場合には、無線伝送装置20-1の外部LANポート25をリンクダウン制御する。
正常時には、無線伝送装置20-1は、ユーザーネットワーク10からの外部LAN信号100を振分回路21において対向局である無線伝送装置30-1の方向、および隣接する無線伝送装置20-2の方向へMACフレームごとに振り分け、無線方向へは送信信号101として、隣接する無線伝送装置方向へは振り分けLAN信号102として出力する。無線方向の送信信号101は送信回路22、無線伝送装置30-1の受信回路33を経て受信信号701として振分回路31に入力される。また、振り分けLAN信号102は、無線伝送装置20-2の振分回路21おいて送信信号101として出力され、送信回路22、無線伝送装置30-2の受信回路33を経て受信信号701として振分回路31へ入力され、振り分けLAN信号502として無線伝送装置30-1内の振分回路31へ入力される。振分回路31は、無線方向からの受信信号701と隣接の無線伝送装置30-2からの振り分けLAN信号502を集約し、ユーザーネットワーク40へ外部LAN信号500として出力する。
図5の無線伝送システムおいて、無線伝送路の品質悪化、もしくは対向局の無線伝送装置の機器障害により、受信した無線信号の品質悪化を検出した場合には、1~n-1段目の無線伝送装置20-1~20-(n-1)、30-1~30-(n-1)と、n段目の無線伝送装置20-n、30-nで動作が異なるため、分けて説明する。
ユーザーネットワークの障害や装置間接続ケーブルの異常により外部LANポートがリンクダウン状態となった場合には1~n段目の無線伝送装置20-1~20-n、30-1~30-n全てが同一の動作となるため、図4の無線伝送装置20-1、30-1を参照して説明する。
後段の無線伝送装置の外部LANポートのリンクダウンや装置間の接続ケーブルの異常発生により、分岐LANポートにリンクダウン状態が発生した場合、1~n-1段目の無線伝送装置20-1~20-(n-1)、30-1~30-(n-1)の動作は同一のため、図4における無線伝送装置20-1、30-1を参照して説明する。なお、n段目の無線伝送装置20-n、30-nは、分岐LANポート26、36は未使用のため常時リンクダウン状態であるため説明は省略する。
無線信号の品質悪化を検出した状態で、外部LANポートのリンクダウンが発生した場合の動作は、前述した外部LANポートのリンクダウン時と同様のため説明は省略する。
無線信号の品質悪化を検出した状態で、分岐LANポートのリンクダウンが発生した場合には、1~n段まで全ての無線伝送装置20-1~20-n、30-1~30-nの動作は同じため、図4における無線伝送装置20-1、30-1を参照して動作を説明する。
図4の第1の実施形態の無線伝送システム、図5の実施形態の無線伝送システムにおける無線伝送装置は、送信回路、受信回路をそれぞれ1系統有している。これに対し、図9に示す本実施形態の無線伝送システムにおける無線伝送装置20-1は2系統の送信回路22a、22b、2系統の受信回路23a、23b(他の無線伝送装置も同様)を有している。これにより、無線伝送路の冗長化を実現している。
また、第1から第3の実施形態では、ユーザーネットワークとの接続端子である外部LANポート、および隣接する無線伝送装置との接続端子である分岐LANポートが、それぞれ1系統のみである。これに対し、図10に示す本実施形態は、外部LANポートおよび分岐LANポートを2重化したものである。
Claims (18)
- 対向する無線伝送装置間で信号を互いに送受信する無線伝送方法であって、
入力された信号を、第1の無線伝送装置で振り分け、
一方の信号を該第1の無線伝送装置に対向する第2の無線伝送装置へ送信するとともに、
他方の信号を前記第1の無線伝送装置に隣接する第3の無線伝送装置へ出力し、さらに該第3の無線伝送装置に対向する第4の無線伝送装置を経由して、該第4の無線伝送装置に隣接する前記第2の無線伝送装置へ送信し、
前記第1および前記第4の無線伝送装置のそれぞれから受信した信号を前記第2の無線伝送装置で集約して出力する、無線伝送方法。 - 入力された信号を、前記第2の無線伝送装置で振り分け、
一方の分岐信号を前記第1の無線伝送装置へ送信するとともに、
他方の分岐信号を前記第4の無線伝送装置および前記第3の無線伝送装置を経由して、前記第1の無線伝送装置へ送信し、
前記第2および前記第3の無線伝送装置のそれぞれから受信した信号を前記第1の無線伝送装置で集約して出力する、請求項1に記載の無線伝送方法。 - 前記第1の無線伝送装置は、前記第2の無線伝送装置から受信した無線信号から該無線信号の異常を検出した場合には、前記第2の無線伝送装置への無線伝送路への信号の伝送を停止する、請求項1または請求項2に記載の無線伝送方法。
- 前記第1の無線伝送装置は、該第1の無線伝送装置の外部ポートのリンクダウン状態を検出した場合、該第1の無線伝送装置の分岐ポートをリンクダウンさせ、前記第3の無線伝送装置との信号伝送を停止する、請求項1から3のいずれか1項に記載の無線伝送方法。
- 前記第1の無線伝送装置は、該第1の無線伝送装置の分岐ポートのリンクダウン状態を検出した場合、前記2の無線伝送装置の分岐ポートをリンクダウンさせ、前記第4の無線伝送装置との信号伝送を停止する、請求項1から4のいずれか1項に記載の無線伝送方法。
- 前記第1の無線伝送装置は、該第1の無線伝送装置の無線信号または前記第2の無線伝送装置の無線信号の品質悪化と、前記第1の無線伝送装置の分岐ポートのリンクダウン状態とを検出した場合には、前記第2の無線伝送装置の外部ポートと分岐ポートをリンクダウンさせる、請求項1から5のいずれか1項に記載の無線伝送方法。
- 無線伝送路、無線伝送装置、無線伝送装置間の接続に異常が発生した場合、信号の送信停止またはポートのリンクダウン制御により、異常が発生している無線伝送装置と無線伝送路をシステムから切り離し、正常な無線伝送装置で信号伝送を継続する、請求項1から6のいずれか1項に記載の無線伝送方法。
- 無線信号を互いに送受信する無線伝送装置であって、
対向する無線伝送装置に無線信号を送信する送信回路と、
対向する無線伝送装置から無線信号を受信する受信回路と、
入力された信号の振り分けと、信号の集約を行う振分回路と、
を有し、
前記振分回路は、入力された信号を振り分け、一方の信号を前記対向する無線伝送装置へ送信するとともに、他方の信号を前記隣接する無線伝送装置へ出力し、また該隣接する無線伝送装置および前記対向する無線伝送装置のそれぞれから受信した信号を集約して出力する、
無線伝送装置。 - 信号を入力するための外部ポートと、前記隣接する無線伝送装置へ信号を出力するための分岐ポートと、をさらに有する、請求項8に記載の無線伝送装置。
- 前記振分回路から各ポートのリンク状態を示すリンク状態信号を受け取る一方、各ポートのリンク制御を行うためのリンク制御信号を前記振分回路に出力する制御回路をさらに有する、請求項9に記載の無線伝送装置。
- 前記振分回路は、前記制御回路から入力したリンク制御信号に従い、各ポートのリンクダウン制御を行う、請求項10に記載の無線伝送装置。
- 前記振分回路は、前記制御回路から入力したリンク制御信号に従い、前記送信回路への信号の出力を停止する、請求項10または11に記載の無線伝送装置。
- 前記振分回路は、前記制御回路が、前記対向する無線伝送装置から受信した無線信号から該無線信号の異常を検出した場合には、該対向する無線伝送装置との無線伝送路への信号の伝送を停止する、請求項12に記載の無線伝送装置。
- 前記振分回路は、前記制御回路が、前記外部ポートのリンクダウン状態を検出し、リンク制御信号を出力した場合には、前記分岐ポートをリンクダウンさせることで、前記隣接する無線伝送装置との信号伝送を停止する、請求項11から13のいずれか1項に記載の無線伝送装置。
- 前記制御回路は、前記分岐ポートのリンクダウン状態を検出した場合、前記対向する無線伝送装置の分岐ポートをリンクダウンさせ、前記対向する無線伝送装置に隣接する無線伝送装置との信号伝送を停止する、請求項11から14のいずれか1項に記載の無線伝送装置。
- 前記制御回路は、該無線伝送装置の無線信号または前記対向する無線伝送装置の無線信号の品質悪化と、該無線伝送装置の前記分岐ポートのリンクダウン状態とを検出した場合には、前記対向する無線伝送装置の外部ポートと分岐ポートをリンクダウンさせる、請求項11から15のいずれか1項に記載の無線伝送装置。
- 前記送信回路と前記受信回路は冗長化されている、請求項8から16のいずれか1項に記載の無線伝送装置。
- 前記外部ポートと前記分岐ポートは冗長化されている、請求項8から17のいずれか1項に記載の無線伝送装置。
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| EP10738536.1A EP2395789A4 (en) | 2009-02-03 | 2010-02-03 | WIRELESS TRANSMISSION METHOD AND WIRELESS TRANSMISSION DEVICE |
| JP2010549486A JP5387589B2 (ja) | 2009-02-03 | 2010-02-03 | 無線伝送装置 |
| US13/141,364 US8923111B2 (en) | 2009-02-03 | 2010-02-03 | Wireless transmission method and wireless transmission device |
| CN2010800061471A CN102301781A (zh) | 2009-02-03 | 2010-02-03 | 无线传送方法和无线传送设备 |
| RU2011131771/07A RU2480951C2 (ru) | 2009-02-03 | 2010-02-03 | Способ и устройство беспроводной передачи данных |
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| JP5387589B2 (ja) | 2014-01-15 |
| RU2011131771A (ru) | 2013-03-10 |
| US20120020289A1 (en) | 2012-01-26 |
| EP2395789A1 (en) | 2011-12-14 |
| EP2395789A4 (en) | 2015-09-30 |
| US8923111B2 (en) | 2014-12-30 |
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