JP2008141494A - Cross connect device, wireless transmission device, transmission control method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless transmission device which solves problems by transmitting/receiving a control signal by using a main signal bandwidth only when the change of cross connect setting is required. <P>SOLUTION: A radio transmission device which multiplexes a plurality of PDH signal lines into a single radio frame after a cross connect connection to an arbitrary radio channel, transmits the radio frame from a radio transmission line one on one to an opposed station, demultiplexes the frame into the PDH signal lines of an N channel again at the opposed station, and outputs the PDH signal lines into an arbitrary output channel after the cross connect connection. The radio transmission device transmits/receives a control signal by using a main signal transmission bandwidth only when a setting change is required, without preliminarily securing a transmission bandwidth of a control signal regarding a cross connect control in the radio transmission line. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, an N-channel (N is a natural number of 2 or more) PDH (please chronic digital hierarchy) signal sequence is cross-connected to an arbitrary radio channel, and then multiplexed into one radio frame to be transmitted via a radio transmission path. The present invention relates to a radio transmission technique in which data is transmitted to an opposite station on a one-to-one basis, separated into N-channel PDH signal sequences again at the opposite station, and output by cross-connecting to an arbitrary output channel.

  As the capacity of the network increases, the number of channels accommodated in the PDH wireless transmission device is also increasing. In addition, along with the increase in the number of accommodated channels, there is a demand for ease of line change and line extension. The cross-connect control that enables the signal connection route to be easily changed without a physical cable connection change is particularly effective as a measure for reducing maintenance work accompanying an increase in the number of accommodated channels.

  Various techniques related to cross-connect control have been proposed for SDH transmission line networks having a large capacity transmission band. For example, in Patent Document 1, a cross-connect control signal is transmitted using an overhead area of an SDH signal. In this way, cross-connect control between adjacent transmission devices is realized.

Here, the remote control data is not inserted into the overhead part, but inserted into the information part, and the routing function which is an essential function of the relay apparatus is used as the main signal function by using the SW function built in the apparatus. A technique has been proposed in which a function for inserting and extracting a specific bit in an overhead part and a routing function are unnecessary in each node device, and further, the communication time of remote control information can be shortened (for example, see Patent Document 2). ).
JP 2006-086572 A JP 2000-151600 A

  However, when a transmission apparatus that accommodates an SDH signal is used, it is necessary to always secure a transmission band defined by the SDH signal in the transmission line regardless of the transmission capacity of the accommodated signal sequence, as well as necessary for line control. Regardless of the capacity of the control signal, it is necessary to always ensure a certain path overhead area for the path signal string, and there is a problem that the use efficiency of the band is poor. In particular, a wireless transmission device is required to efficiently use a limited transmission band, and the above problem becomes a particularly important factor.

  The present invention has been made to solve the above-described problems. The object is to provide a wireless transmission apparatus that solves the above-described problems by transmitting and receiving a control signal using the main signal band only when a change in cross-connect setting is necessary.

  In order to solve the above-mentioned problem, the present invention sends control information to the station via the main signal path when the cross-connect control of the opposite station is necessary in updating the transmission path between the opposing cross-connect devices. A cross-connect device that outputs an AIS control signal to an AIS processing circuit of a target transmission line is provided.

In the present invention, a plurality of PDH signal trains are cross-connected to an arbitrary radio channel, and then multiplexed into one radio frame and sent one-to-one to the opposite station via the radio transmission path. A wireless transmission device that outputs again after being separated into N-channel PDH signal sequences and cross-connecting to an arbitrary output channel,
Provided is a wireless transmission device that transmits and receives a control signal using a main signal transmission band only when a setting change is required without securing a transmission band of a control signal related to cross-connect control in the wireless transmission path in advance.

  Further, according to the present invention, when the cross-connect control of the opposite station is necessary in the transmission path update between the opposing cross-connect devices, the control information is sent to the station by the main signal path, and the AIS process of the control target transmission path is performed. A transmission control method for outputting an AIS control signal to a circuit is provided.

In the present invention, a plurality of PDH signal trains are cross-connected to an arbitrary radio channel, and then multiplexed into one radio frame and sent one-to-one to the opposite station via the radio transmission path. It is a transmission control method in a wireless transmission device that outputs again after being separated into N-channel PDH signal sequences and cross-connecting to an arbitrary output channel,
There is provided a transmission control method for transmitting and receiving a control signal using a main signal transmission band only when a setting change is necessary without securing a transmission band of a control signal related to cross-connect control in the wireless transmission path in advance.

  According to the present invention, a dedicated transmission band for notifying the opposite station of a control signal related to the cross-connect setting is not secured in advance in the wireless transmission line, and between the PDH wireless transmission apparatuses facing each other through the wireless transmission line. A cross-connect control signal can be notified.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a PDH radio transmission apparatus according to an embodiment of the present invention. In the embodiment shown in FIG. 1, after N-channel PDH signal trains are cross-connected, they are sent one-to-one to the opposite station via a single radio transmission line, and are again converted to N-channel PDH signal trains by the opposite station. The PDH wireless transmission devices 1a and 1b that perform separation output face each other through a wireless transmission path.

  The wireless transmission device 1b has the same configuration as that of the wireless transmission device 1a. From 3b to 9b, 11b to 19b, and 41b to 46b respectively corresponding to 3a to 9a, 11a to 19a, and 41a to 46a constituting the wireless transmission device 1a. Become.

Here, the configuration of the PDH wireless transmission device 1a of FIG. 1 will be described in detail.
The PDH wireless transmission device 1a includes a cross-connect circuit 3a, control signal processing circuits 4a-1 to 4N, and a wireless transmission / reception circuit 5a. The user setting signal 18a is a cross-connect setting signal from the user, and when changing the cross-connect setting, the radio channel number, the local station PDH input / output channel number, and the opposite station PDH input / output channel to be cross-connected. The number is notified to the control signal processing circuits 4a-1 to 4N provided for each wireless channel.

  The control signal processing circuits 4a-1 to 4N are provided with a circuit for each radio channel, from the cross-connect setting signal extracted from the user setting signal 18a and the opposite station detected from the radio extraction signals 14a-1 to N described later. The connection setting signals 17a-1 to 17-N are generated based on the cross connection setting signal and output to the cross connection circuit 3a.

  The control signal processing circuit 4a-1 includes a connection setting circuit 6a-1, a signal switching circuit 7a-1, an AIS processing circuit 8a-1, and a connection request detection circuit 9a-1. The control signal processing circuits 4a-2 to 4-N have the same configuration as the control signal processing circuit 4a-1.

  The connection setting circuit 6a-1 receives the user setting signal 18a, and extracts the radio channel number, the local station PDH input / output channel number, and the opposite station PDH input / output channel number for performing the cross-connect connection. If the wireless channel number to which the connection setting circuit 6a-1 belongs and the wireless channel number extracted from the user setting signal 18a match, the local station PDH input / output channel number and wireless channel number extracted from the user setting signal 18a are set. A connection setting signal 17a-1 for connection is output to the cross-connect circuit 3a, and connection request channel information 41a indicating the opposite station PDH input / output channel number extracted from the user setting signal 18a to the signal switching circuit 7a-1. -1 and a switching signal 43a-1 indicating that the connection request channel information 41a-1 is selected as a signal to be transmitted to the wireless transmission path.

  Further, when the opposite request connection signal 44a-1 is received from the connection request detection circuit 9a-1 described later, the local station PDH input / output channel number and the wireless channel number are connected based on the opposite request connection signal 44a-1. The connection setting signal 17a-1 is output to the cross-connect circuit 3a, and the response information 42a-1 indicating that the control is performed in response to the switching request from the opposite station, and the response information 42a-1 are transmitted to the wireless transmission path. A switching signal 43a-1 indicating that the signal to be transmitted is selected is output to the signal switching circuit 7a-1.

  Based on the switching signal 43a-1 received from the connection setting circuit 6a-1, the signal switching circuit 7a-1 receives the wireless transmission channel signal 12a-1 received from the cross-connect circuit 3a and the connection request received from the connection setting circuit 6a-1. One of the signals is selected from the channel information 41a-1 and the response information 42a-1 to generate a radio multiplexed signal 13a-1, and outputs it to the radio transceiver circuit 5a.

  When the AIS processing circuit 8a-1 receives the AIS control signal 46a-1 from the connection request detection circuit 9a-1 to be described later, the cross-connect circuit 3a does not need a cross-connect control signal transmitted / received between the wireless transmission paths. In order to prevent output, an AIS (Alarm Indication Signal) signal is multiplexed on the radio reception channel signal 15a-1 and output to the cross-connect circuit 3a. When the AIS control signal 46a-1 is not received, the wireless extraction signal 14a-1 received from the wireless transmission / reception circuit 5a is connected to the wireless reception channel signal 15a-1 and output to the cross-connect circuit 3a.

  The connection request detection circuit 9a-1 monitors the wireless extraction signal 14a-1 received from the wireless transmission / reception circuit 5a, and when detecting a signal indicating a change request for the local station cross-connect setting from the opposite station, the connection setting circuit 6a. 1 outputs the opposite request connection signal 44a-1 and outputs an AIS control signal 46a-1 to the AIS processing circuit 8a-1. When a signal indicating response information indicating that the cross-connect setting change has been performed from the opposite station is detected with respect to the connection request information transmitted from the own station to the opposite station, the opposite response information signal is sent to the connection setting circuit 6a-1. 45a-1 is output and an AIS control signal 46a-1 is output to the AIS processing circuit 8a-1. Further, when it is detected that the PDH signal string is transmitted to the radio extraction signal 14a-1, the output of the AIS control signal 46a-1 is stopped.

  The cross-connect circuit 3a converts the PDH input signals 11a-1 to N to arbitrary radio transmission channel signals 12a-1 to N in accordance with the connection setting signals 17a-1 to 17N received from the control signal processing circuits 4a-1 to 4N. The radio reception channel signals 15a-1 to 15N are connected to arbitrary PDH output signals 16a-1 to 16N in units of channels.

  The PDH input signals 11a-1 to N and the PDH output signals 16a-1 to N are defined as PDH channel signals 19a-1 to 19N for each channel. Also, the radio transmission channel signals 12a-1 to N and the radio reception channel signals 15a-1 to N are defined as radio channel signals 20a-1 to N for each channel.

  The wireless transmission / reception circuit 5a multiplexes the wireless multiplexed signals 13a-1 to 13-N received from the control signal processing circuits 4a-1 to 4N into one wireless frame signal, and then sends the multiplexed signal to the PDH wireless transmission device 1b via the wireless transmission path. To do. In addition, the wireless extraction signals 14a-1 to 14a-1 to N are extracted from the wireless frame signals received from the PDH wireless transmission device 1b via the wireless transmission path, and are output to the control signal processing circuits 4a-1 to 4N.

Next, the operation in the present embodiment will be described in detail with reference to FIG.
PDH channel signals 19a-1 to 19-N connected to the PDH wireless transmission device 1a shown in FIG. 1 and PDH channel signals 19b-1 to 19b-1 to N connected to the PDH wireless transmission device 1b facing each other through the wireless transmission path are Assume that the same channel numbers are cross-connected in a one-to-one relationship.

  Here, the PDH channel signal 19a-2 connected to the PDH radio transmission device 1a is changed to the radio channel signal 20a-1 via the user setting signal 18a of the PDH radio transmission device 1a, and the radio of the PDH radio transmission device 1b (not shown). The operation when the setting is changed so that the channel signal 20b-1 and the PDH channel signal 19b-1 are cross-connected, respectively, will be described in detail with reference to FIG.

  At this time, the user setting signal 18a includes channel number 1 as the wireless channel number, channel number 2 as the local station PDH channel number, and setting information indicating channel number 1 as the opposite station PDH channel number. N is notified.

  The control signal processing circuit 4a-1 belonging to the radio channel number designated by the user setting signal 18a extracts its own PDH input / output channel number from the user setting signal 18a to obtain the PDH channel signal 19a-2 and the radio channel signal 20a-. 1 is generated and output to the cross-connect circuit 3a. Based on the connection setting signal 17a-1, the cross-connect circuit 3a performs a cross-connect connection process on the PDH input signal 11a-2 to the wireless transmission channel signal 12a-1 and the wireless reception channel signal 15a-1 to the PDH output signal 16a-2. I do.

  The control signal processing circuit 4a-1 extracts the opposite station PDH channel number extracted from the user setting signal 18a to generate connection request channel information 41a-1, and wirelessly multiplexes the connection request channel information 41a-1. A switching signal 43a-1 indicating selection as the signal 13a-1 is generated and output to the signal switching circuit 7a-1.

  The signal switching circuit 7a-1 selects the connection request channel information 41a-1 based on the switching signal 43a-1 to generate a wireless multiplexed signal 13a-1, and generates a wireless transmission / reception circuit 5a, a wireless transmission path, and a PDH wireless transmission device 1b. Is sent to the control signal processing circuit 4b-1 via the wireless transmission / reception circuit 5b (not shown) and the wireless extraction signal 14b-1.

FIG. 2 shows the control signal processing circuit 4b-1 of the wireless transmission device 1b.
Referring to FIG. 2, in the connection request detection circuit 9b-1 of the control signal processing circuit 4b-1, connection request channel information 41a-1 multiplexed by the radio transmission apparatus 1a is multiplexed on the radio extraction signal 14b-1. When this is detected, an AIS control signal 46b-1 is generated and output to the AIS processing circuit 8b-1 so that the control signal is not output to the cross-connect circuit 3b, and a wireless channel is generated based on the connection request channel information 41a-1. An opposite request connection signal 44b-1 indicating that the signal 20b-1 and the PDH channel signal 19b-1 are to be connected is generated and output to the connection setting circuit 6b-1.

  The connection setting circuit 6b-1 generates a connection setting signal 17b-1 indicating that the radio channel signal 20b-1 and the PDH channel signal 19b-1 are connected based on the facing request connection signal 44b-1, and the cross-connect circuit 3b. Receives the connection setting signal 17b-1 and changes the connection. Further, response information 42b-1 for notifying the PDH radio transmission apparatus 1a that cross-connect setting control has been performed according to the connection request channel information 41a-1 is generated, and the response information 42b-1 is selected. The signal is output together with the switching signal 43b-1 to the signal switching circuit 7b-1.

  The signal switching circuit 7b-1 selects the response information 42b-1 according to the switching signal 43b-1 to generate a wireless multiplexed signal 13b-1, and generates a wireless transmission / reception circuit 5b, a wireless transmission path, and a PDH (not shown) in FIG. The data is output to the control signal processing circuit 4a-1 via the wireless transmission / reception circuit 5a of the wireless transmission device 1a.

  When the connection request detection circuit 9a-1 of the control signal processing circuit 4a-1 detects that the response information 42b-1 is multiplexed on the wireless extraction signal 14a-1, no control signal is output to the cross-connect circuit 3a. Thus, the AIS control signal 46a-1 is generated and output to the AIS processing circuit 8a-1, and the opposite response information 45a-1 indicating that the opposite station has completed the cross-connect connection based on the request from the own station is generated. Generate and notify the connection setting circuit 6a-1.

  Since the connection setting circuit 6a-1 has received the opposite response information signal 45a-1, it is determined that the cross-connect setting change has been performed in both the PDH radio transmission apparatuses 1a and 1b, and the signal switching circuit 7a- 1 outputs a switching signal 43a-1 to select the wireless transmission channel signal 12a-1 from the cross-connect circuit 3a, and the signal switching circuit 7a-1 selects the wireless transmission channel signal 12a-1 and wirelessly It outputs to the multiplexed signal 13a-1.

  The connection request detection circuit 9b-1 of the PDH wireless transmission device 1b detects that the wireless extraction signal 14b-1 has switched back to the normal PDH main signal sequence and stops outputting the AIS control signal 46b-1. The output of the opposite request connection signal 44b-1 output to the connection setting circuit 6b-1 is stopped.

  When the connection setting circuit 6b-1 of the PDH wireless transmission device 1b detects that the reception of the opposite request connection signal 44b-1 is stopped, the wireless transmission channel signal from the cross-connect circuit 3b is transmitted to the signal switching circuit 7b-1. The switching signal 43b-1 for selecting 12b-1 is output, and the signal switching circuit 7b-1 selects the wireless transmission channel signal 12b-1 and outputs it to the wireless multiplexed signal 13b-1.

  The connection request detection circuit 9a-1 of the PDH wireless transmission device 1a detects that the wireless extraction signal 14a-1 has switched back to the normal PDH main signal sequence and stops outputting the AIS control signal 46a-1. The output of the opposite response information signal 45a-1 output to the connection setting circuit 6a-1 is stopped.

  As described above, the PDH channel signal 19a-2 of the PDH wireless transmission device 1a is cross-connected to the PDH channel signal 19b-1 of the PDH wireless transmission device 1b via the wireless channel signal 20a-1, and the conduction of the main signal is completed. To do.

  According to the above-described embodiment, the PDH radio that is opposed via the radio transmission path without preliminarily securing the dedicated transmission band for notifying the opposite station of the control signal related to the cross-connect setting in the radio transmission path. A cross-connect control signal can be notified between transmission apparatuses. This is because the band for transmitting the PDH signal sequence is used instead of the cross-connect control signal notification only when the cross-connect setting is necessary.

  In addition, it is possible to prevent signal transmission to an erroneous transmission route due to a mismatch in the cross-connect setting between the wireless opposite stations. The reason is that the cross-connect setting of the own station and the opposite station can be performed simultaneously with the setting from either one of the stations. Also, during the setting, an AIS signal is sent to the external device, and a notification of the opposite station setting completion is received and then switched back to the main signal.

  In the embodiment shown in FIG. 1, the PDH signal sequences accommodated by the PDH radio transmission apparatuses 1a and 1b are both N channels, but the number of channels N accommodated by the PDH radio transmission apparatus 1a as shown in FIG. The number of channels M accommodated by the PDH wireless transmission device 1b (M is a natural number of 2 or more and N ≠ M) may be different from each other.

  Further, in the embodiment shown in FIG. 1, the connection channel information on the local station side, the wireless channel information to be connected, and the connection channel information on the opposite side are set as the settings related to the cross-connect, but the identification for identifying the PDH transmission apparatus By setting the ID together, the present invention can also be applied when a plurality of wireless transmission devices are connected as shown in FIG.

  Each of the above-described embodiments is a preferred embodiment of the present invention, and various modifications can be made without departing from the scope of the present invention. For example, the processing for realizing the function of the device may be performed by causing the device to read and execute a program for realizing the function of the PDH wireless transmission device. Further, the program is transmitted to another computer system by a transmission wave via a computer-readable recording medium such as a CD-ROM or a magneto-optical disk, or via a transmission medium such as the Internet or a telephone line. Also good.

It is a block diagram of the PDH radio transmission apparatus of an embodiment of the invention. It is a figure which shows the control signal processing circuit of the wireless transmission apparatus 1b of embodiment of this invention. It is a figure which shows the structure of other embodiment of this invention. It is a figure which shows the structure of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 PDH radio | wireless transmission apparatus 2 PDH radio | wireless transmission apparatus 3 Cross-connect circuit 4 Control signal multiplexing circuit 5 Wireless transmission / reception circuit 6 Connection setting circuit 7 Signal switching circuit 8 AIS processing circuit 9 Connection request detection circuit 11-x PDH input signal 12-x radio Transmission channel signal 13-x Radio multiplexed signal 14-x Radio extraction signal 15-x Radio reception channel signal 16-x PDH output signal 17-x Connection setup signal 18 User setup signal 19-x PDH channel signal 20-x Radio channel signal 41 Connection Request Channel Information 42 Response Information 43 Switching Signal 44 Opposite Request Connection Signal 45 Opposite Response Information Signal 46 AIS Control Signal

Claims (9)

  When updating the transmission path between opposing cross-connect devices, if cross-connect control of the opposite station is required, control information is sent to the station via the main signal path, and an AIS control signal is sent to the AIS processing circuit of the control target transmission path. A cross-connect device characterized by output. After a plurality of PDH signal trains are cross-connected to an arbitrary radio channel, they are multiplexed into one radio frame and sent one-to-one to the opposite station via the radio transmission path, and the N-channel PDH signal is again transmitted to the opposite station. A wireless transmission device that outputs a signal after being separated into a row and cross-connect connected to an arbitrary output channel,
A radio transmission apparatus that transmits and receives a control signal using a main signal transmission band only when a setting change is necessary without securing a transmission band of a control signal related to cross-connect control in advance in the wireless transmission path.   The radio transmission apparatus according to claim 2, wherein transmission / reception is performed using only a main signal transmission band corresponding to a radio channel with a change in a transmission band of a control signal related to cross-connect control.   4. An external output signal connected to a radio channel transmitting / receiving a control signal is controlled by AIS when a control signal related to cross-connect control is transmitted / received by a radio transmission path. The wireless transmission device described.   When updating the transmission path between opposing cross-connect devices, if cross-connect control of the opposite station is required, control information is sent to the station via the main signal path, and an AIS control signal is sent to the AIS processing circuit of the control target transmission path. A transmission control method characterized by outputting. After a plurality of PDH signal trains are cross-connected to an arbitrary radio channel, they are multiplexed into one radio frame and sent one-to-one to the opposite station via the radio transmission path, and the N-channel PDH signal is again transmitted to the opposite station. A transmission control method in a wireless transmission device that outputs data after being separated into a row and cross-connect connected to an arbitrary output channel,
A transmission control method characterized in that a control signal is transmitted and received using a main signal transmission band only when a setting change is necessary without securing a transmission band of a control signal related to cross-connect control in the wireless transmission path in advance.   7. The transmission control method according to claim 6, wherein transmission / reception is performed using only a main signal transmission band corresponding to a radio channel with a change in a transmission band of a control signal related to cross-connect control.   8. The control apparatus according to claim 6, wherein when a control signal related to cross-connect control is transmitted / received through a wireless transmission path, an external output signal connected to a wireless channel transmitting / receiving the control signal is controlled by AIS. The transmission control method described.   A program for causing a computer system to realize the function according to any one of claims 1 to 4.

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