JP2013005008A - Communication device, communication system and radio transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable supervision and control of a device on the receiving side, even when a radio transmission channel condition is deteriorated and information is selectively transmitted because of reduced transmission capacity due to the function of an adaptive modulation system in a radio transmission system performing adaptive modulation.SOLUTION: An extraction instruction information acquisition unit 109 acquires extraction instruction information, and according to the extraction instruction information, a multiplexer unit 105 generates a radio signal. A radio frame transmission unit 106 transmits the radio signal. By this, a radio transmission system 1 can preferentially transmits information desired by an operator, such as RSOH or a byte specified by the operator. Thus, even when a radio transmission channel condition is deteriorated and information is selectively transmitted because of reduced transmission capacity due to the function of an adaptive modulation system, a radio transmission device 500 can perform supervision and control of a device.

Description

The present invention relates to a communication device, a communication system, and a wireless transmission method.

  In wireless communication, an adaptive modulation method that automatically switches a modulation method according to the state of a wireless transmission path is known. Specifically, when the state of the wireless transmission path is good, the communication apparatus has a low tolerance to the deterioration of the wireless transmission path, but has a large transmission capacity (for example, a multiple modulation system with a large number of multiple values). When a wireless transmission path condition deteriorates, a modulation scheme that is small in transmission capacity but has a high tolerance to the degradation of the wireless transmission path condition (for example, a multiple modulation scheme with a small multi-value number) is used. To send.

  In addition, the wireless transmission device described in Patent Document 1 corresponds to an automatic transmission power control function for controlling the transmission power of the local station so that the reception power of the opposite station is maintained at a predetermined value, and the quality of the wireless transmission path. In a wireless transmission device with an adaptive modulation function that automatically switches the modulation method, the transmission power margin that is the difference between the maximum transmission power that can be transmitted received from the opposite station and the current transmission power is detected by the local station. In consideration of the received power received by the local station, a modulation scheme determining circuit for switching the modulation scheme based on the adaptive modulation scheme is included. For example, even if the received power falls below the modulation method switching threshold, if the received power can be recovered to the modulation method switching threshold or more by the ATPC of the opposite station, switching to a modulation method with a large variation tolerance but a small transmission capacity is suppressed. By doing so, it is possible to prevent unnecessary signal interruption.

  In addition, in a multiplex modulation system that performs adaptive modulation, a method is known in which priorities for communication target signals are set in advance. Specifically, the communication device stores the priority for each signal to be multiplexed in advance. When the state of the wireless transmission path is good, the communication apparatus multiplexes and transmits all signals to be multiplexed. On the other hand, when the state of the wireless transmission path deteriorates, a signal having a high priority is preferentially multiplexed, and a signal having a low priority is not multiplexed so that the transmission capacity is suppressed and transmitted. Thereby, even when the state of the wireless transmission path deteriorates, it is possible to maintain the transmission rate of a signal with high priority.

JP 2009-177459 A

However, in the applied modulation scheme, when the transmission capacity is reduced and information is selectively transmitted, information necessary for monitoring and control of the device is not transmitted, and the receiving side device (the receiving side communication device or the relevant device) In a device connected to a communication device), there is a possibility that monitoring and control of the device on the transmission side (the communication device on the transmission side or the device connected to the communication device) cannot be performed.
For example, if the state of a wireless transmission path deteriorates in a multiplex modulation system that performs adaptive modulation, and the communication device no longer multiplexes a low-priority signal, the receiving communication device is included in the signal that is no longer multiplexed. There is a possibility that the monitoring control information of the remote device cannot be acquired, and the remote device cannot be monitored or controlled.

  An object of this invention is to provide the communication apparatus, communication system, and radio | wireless transmission method which can solve the above-mentioned subject.

  The present invention has been made in order to solve the above-described problems. A communication device according to an aspect of the present invention includes a data acquisition unit that acquires data, and a radio signal that is specified by a modulation method designated among a plurality of modulation methods. For each of a transmission unit to transmit and a modulation scheme in which the transmission unit transmits a radio signal, acquisition instruction information for specifying a location to be included in the radio signal transmitted by the transmission unit is acquired from the data acquired by the data acquisition unit The extraction instruction information acquisition unit that performs the modulation scheme information acquisition that acquires the modulation scheme information that specifies the modulation scheme of the radio signal transmitted by the transmission unit, and the modulation scheme information that the modulation scheme information acquisition unit acquires. A transmission signal that extracts a location specified by the extraction instruction information in association with a modulation method from data acquired by the data acquisition unit and generates a transmission signal including the extracted data A transmission unit, and the transmission unit transmits the transmission signal generated by the transmission signal generation unit in a modulation scheme specified by the modulation scheme information acquired by the modulation scheme information acquisition unit. Features.

A communication system according to an aspect of the present invention is a communication system including a first communication device and a second communication device, wherein the first communication device includes a data acquisition unit that acquires data, and a plurality of modulations. For each of a transmission unit that transmits a radio signal using a specified modulation method among the methods and a modulation method in which the transmission unit transmits a radio signal, the radio that the transmission signal transmits among the data acquired by the data acquisition unit An extraction instruction information acquisition unit that acquires extraction instruction information that specifies a location to be included in a signal; a modulation scheme information acquisition unit that acquires modulation scheme information that specifies a modulation scheme of a radio signal transmitted by the transmission unit; and the modulation scheme The location specified in the extraction instruction information in association with the modulation method specified by the modulation method information acquired by the information acquisition unit is extracted from the data acquired by the data acquisition unit and extracted. A transmission signal generation unit that generates a transmission signal including a data, and the transmission unit includes the modulation scheme information acquired by the modulation scheme information acquisition unit for the transmission signal generated by the transmission signal generation unit. The second communication device transmits with a designated modulation method,
It is characterized by comprising: a receiving unit that receives a radio signal; and a data extracting unit that extracts each data included in the transmission signal generating unit from the radio signal received by the receiving unit.

  A wireless transmission method according to an aspect of the present invention is a wireless transmission method performed by a communication apparatus, and includes transmitting a wireless signal using a data acquisition step of acquiring data and a specified modulation method among a plurality of modulation methods. For each of the transmission step and the modulation scheme for transmitting the radio signal in the transmission step, the extraction instruction information for specifying the location to be included in the radio signal transmitted in the transmission step is acquired from the data acquired in the data acquisition step. An extraction instruction information acquisition step, a modulation scheme information acquisition step for acquiring modulation scheme information for specifying a modulation scheme of a radio signal transmitted in the transmission step, and a modulation specified by the modulation scheme information acquired in the modulation scheme information acquisition step The location specified in the extraction instruction information in association with the method is determined from the data acquired in the data acquisition step. And a transmission signal generation step for generating a transmission signal including the extracted data. In the transmission step, the modulation signal acquired in the modulation scheme information acquisition step is used to acquire the transmission signal generated in the transmission signal generation step. It transmits by the modulation system which system information designates, It is characterized by the above-mentioned.

  According to the present invention, even when the state of the wireless transmission path deteriorates and the transmission capacity is reduced by the function of the adaptive modulation method and information is selectively transmitted, the receiving side device can monitor and control the device. Can be done.

It is a schematic block diagram which shows the structure of the wireless transmission system in one Embodiment of this invention. It is a data block diagram which shows the data structure of the extraction instruction | indication information in the embodiment. It is explanatory drawing which shows the example of the extraction instruction information in the embodiment. 5 is a flowchart illustrating a processing procedure in which a multiplexing control unit controls signal multiplexing in a wireless transmission device in the embodiment. In the embodiment, it is explanatory drawing which shows the example of the multiplexing process which a multiplexing part performs. In the embodiment, it is explanatory drawing which shows the example of the multiplexing information which a wireless OH production | generation part includes in wireless overhead information. 5 is a flowchart illustrating a processing procedure in which the wireless transmission device extracts data from a signal transmitted from the wireless transmission device and transmits an STM-1 signal in the embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic block diagram showing the configuration of a wireless transmission system according to an embodiment of the present invention. In the figure, a wireless transmission system (communication system) 1 includes a wireless transmission device (communication device, first communication device) 100, a wireless transmission device (second communication device) 500, and a monitoring terminal device 900. The wireless transmission device 100 includes STM receiving units 101-1 and 101-2, SOH extracting units 102-1 and 102-2, a non-multiplexed signal receiving unit 103, a wireless OH generating unit 104, a multiplexing unit (transmission signal) Generation unit) 105, radio frame transmission unit (transmission unit) 106, extraction instruction information acquisition unit 109, radio frame reception unit (modulation scheme information acquisition unit) 110, separation unit 111, modulation scheme control unit 112, And a multiplex control unit 113. The radio transmission apparatus 500 includes a multiplexing unit 505, a radio frame transmission unit 506, a radio frame reception unit (reception unit) 510, a separation unit (data extraction unit) 511, a modulation scheme control unit 512, and a signal quality monitoring unit. 519, a wireless OH termination unit 521, STM generation units 522-1 and 522-2, STM transmission units 523-1 and 523-2, and a non-multiplex signal transmission unit 524.

The wireless transmission device 100 receives and multiplexes a plurality of signals, and transmits the signals to the wireless transmission device 500 using wireless signals. In the present embodiment, the wireless transmission device 100 and the wireless transmission device 500 both have a transmission function and a reception function for signals of a multiplex transmission method. The transmission side of the multiplex transmission system is shown and described, and the wireless transmission apparatus 500 is shown and described as the multiplex transmission system signal reception side.
However, the application range of the present invention is not limited to a wireless transmission system capable of bidirectionally transmitting and receiving a multiplex transmission system signal. The present invention can be applied to various wireless transmission systems in which a data transmission-side wireless transmission device transmits data to a data reception-side wireless transmission device using a multiplexed or non-multiplexed transmission method signal.

The STM receiving unit 101-1 acquires data transmitted from an external communication device. Specifically, the STM receiving unit 101-1 acquires data transmitted from an external communication device using an STM-1 (Synchronous Transport Module-1) signal. Then, the STM receiving unit 101-1 outputs the received STM-1 signal to the SOH extracting unit 102-1 and the multiplexing unit 105.
Here, STM is an ITU-T G.264 standard defined by ITU-T (International Telecommunication Union Telecommunication Standardization Sector). This is a signal frame format of SDH (Synchronous Digital Hierarchy) standardized in 707.
Similarly, the STM receiving unit 101-2 acquires data transmitted from an external communication device. Specifically, the STM receiving unit 101-2 acquires data transmitted as an STM-1 signal from an external communication device. Then, the STM receiving unit 101-2 outputs the received STM-1 signal to the SOH extracting unit 102-2 and the multiplexing unit 105.
In the following description, the communication path through which the STM receiving unit 101-1 receives the STM-1 signal is indicated by “CH1” (channel 1), and the communication path through which the STM receiving unit 101-2 receives the STM-1 signal is indicated. This is indicated by “CH2” (channel 2).

The SOH extraction unit 102-1 extracts RSOH (Regenerator Section Overhead) information by synchronizing the frames of the STM-1 signal output from the STM reception unit 101-1. Then, the SOH extraction unit 102-1 outputs the extracted RSOH information to the multiplexing unit 105.
Similarly, the SOH extracting unit 102-2 extracts RSOH information by taking frame synchronization of the STM-1 signal output from the STM receiving unit 101-2. Then, the SOH extraction unit 102-2 outputs the extracted RSOH information to the multiplexing unit 105.

  The non-multiplexed signal receiving unit 103 acquires data transmitted from an external communication device using a non-multiplexed signal such as an Ethernet (registered trademark) signal. Then, the non-multiplexed signal receiving unit 103 outputs the received signal to the multiplexing unit 105.

  The radio frame receiving unit 110 receives and demodulates the radio signal and outputs the obtained radio frame to the separation unit 111. In particular, the radio frame reception unit 110 acquires modulation scheme information by receiving a multiplex transmission scheme signal transmitted by the radio frame transmission unit 106 of the radio transmission apparatus 500 including modulation scheme information in overhead. To do. The modulation scheme information here is information that designates the modulation scheme of the radio signal transmitted by the radio frame transmitting unit 106. This modulation scheme information is generated by a modulation scheme control unit 512, which will be described later, according to the quality of the received signal from the wireless transmission device 100.

Separating section 111 separates each multiplexed signal and overhead from the radio frame output from radio frame receiving section 110. Then, the separation unit 111 outputs the separated overhead to the modulation scheme control unit 112.
The modulation scheme control unit 112 extracts modulation scheme information from the overhead output from the separation unit 111, and outputs the extracted modulation scheme information to the multiplexing unit 105, the radio frame transmission unit 106, and the multiplexing control unit 113. The modulation scheme of the wireless transmission device 100 is controlled.

  The extraction instruction information acquisition unit 109 acquires extraction instruction information. The extraction instruction information here refers to the radio frame transmission unit 106 among the data acquired by the STM reception unit 101-1 and the STM reception unit 101-2 for each of the modulation schemes by which the radio frame transmission unit 106 transmits radio signals. Is information for specifying a location to be included in the radio signal transmitted. The extraction instruction information is generated by the monitoring terminal device 900, and the extraction instruction information acquisition unit 109 stores the extraction instruction information transmitted from the monitoring terminal device 900.

The multiplexing control unit 113 generates multiplexing information based on the extraction instruction information stored in the extraction instruction information acquiring unit 109 and the modulation scheme information output from the modulation scheme control unit 112, and the generated multiplexing information is And output to the wireless OH generation unit 104 and the multiplexing unit 105. The multiplexing information here is information indicating data to be multiplexed by the multiplexing unit 105. The multiplexing control unit 113 generates multiplexing information for each of the data acquired by the STM receiving unit 101-1 and the data acquired by the STM receiving unit 101-2. As will be described later, the multiplexing information generated by the multiplexing control unit 113 includes “STM-1”, “OH”, “REG”, “SEL (...)” (... It takes one of the values “AIS” (Alarm Indication Signal).
The wireless OH generation unit 104 generates wireless overhead information (the overhead of the signal transmitted by the wireless frame transmission unit 106) based on the multiplexed information output from the multiplexing control unit 113, and sends the generated wireless overhead information to the multiplexing unit 105. Output.

Multiplexer 105 determines the location specified by the extraction instruction information in association with the modulation scheme specified by the modulation scheme information acquired by radio frame receiver 110 as STM receiver 101-1 or SOH extractor 102-1. The STM receiving unit 101-2 or the SOH extracting unit 102-2 and the non-multiplexed signal receiving unit 103 extract the data acquired and generate a transmission signal including the extracted data.
Specifically, the multiplexing unit 105 first generates a radio frame format of the modulation scheme indicated by the modulation scheme information output from the modulation scheme control unit 112. Further, the multiplexing unit 105 extracts the data indicated by the multiplexed information for the signal from the STM-1 signal output from the STM receiving unit 101-1 or the RSOH information output from the SOH extracting unit 102-1. Further, the multiplexing unit 105 extracts the data indicated by the multiplexed information for the signal from the STM-1 signal output from the STM receiving unit 101-2 or the RSOH information output from the SOH extracting unit 102-1. Further, the multiplexing unit 105 extracts the entire signal output from the non-multiplexed signal receiving unit 103. Then, the multiplexing unit 105 multiplexes each extracted data into a radio frame format. Further, the multiplexing unit 105 multiplexes the wireless overhead information output from the wireless OH generation unit 104 as overhead information of a wireless frame, and generates a transmission signal (wireless frame). Multiplexer 105 then outputs the generated transmission signal to radio frame transmitter 106.

  The radio frame transmitting unit 106 modulates the transmission signal (radio frame) output from the multiplexing unit 105 according to the modulation scheme indicated by the modulation scheme information output from the modulation scheme control unit 112 and transmits the modulated signal. That is, the radio frame transmitting unit 106 transmits the transmission signal generated by the multiplexing unit 105 in the modulation scheme specified by the modulation scheme information acquired by the radio frame receiving unit 110 (specified modulation among a plurality of modulation schemes). To transmit radio signals in the same manner).

  When the wireless transmission device 500 receives the wireless signal transmitted from the wireless transmission device 100, the wireless transmission device 500 separates the wireless signal, extracts a plurality of signals, and transmits the extracted signals. Also, the wireless transmission device 500 determines the modulation method of the wireless signal transmitted by the wireless transmission device 100 based on the quality of the received signal from the wireless transmission device 100, and uses the determined modulation method as modulation method information. To 100.

  Radio frame receiving section 510 receives a radio signal, demodulates the received radio signal according to a modulation scheme indicated by modulation scheme information output from modulation scheme control section 512, and a signal (radio frame) obtained by the demodulation. The data is output to the separation unit 511 and the signal quality monitoring unit 519.

The signal quality monitoring unit 519 determines the quality of the radio signal (the signal output from the radio frame receiving unit 510) transmitted from the radio transmission device 100, that is, between the radio transmission device 100 and the radio transmission device 500. The state of the wireless transmission path is determined, quality information indicating the determination result is generated and output to the modulation scheme control unit 512.
The modulation scheme control unit 512 determines the modulation scheme of the radio signal transmitted by the radio transmission apparatus 100 (radio frame transmission unit 106) according to the quality information output from the signal quality monitoring unit 519, and generates modulation scheme information. The generated modulation scheme information is output to multiplexing section 505, radio frame receiving section 510, and demultiplexing section 511.

Multiplexer 505 generates a multiplex transmission method signal (radio frame) to be transmitted to radio transmission apparatus 100. At that time, the multiplexing unit 505 includes the modulation scheme information output from the modulation scheme control unit 512 in the overhead of the signal to be generated. Then, multiplexing section 505 outputs the generated signal to radio frame transmission section 506.
Radio frame transmission section 506 modulates and transmits the signal output from multiplexing section 505.

Separating section 511 separates each multiplexed signal and overhead (radio overhead information) from the radio frame output from radio frame receiving section 510. Then, the separation unit 511 outputs the separated signal to the STM generation unit 522-1, the STM generation unit 522-2, and the non-multiplex signal transmission unit 524. Here, the STM transmission unit 523-1 is connected to the transmission destination of the STM-1 signal received by the STM reception unit 101-1, and the STM transmission unit 523-2 is received by the STM reception unit 101-2. The non-multiplexed signal transmission unit 524 is connected to the transmission destination of the non-multiplexed signal received by the non-multiplexed signal receiving unit 103. Therefore, the separation unit 511 outputs, to the STM generation unit 522-1, a signal corresponding to the signal received by the STM reception unit 101-1, among the separated signals, and corresponds to the signal received by the STM reception unit 101-2. A signal corresponding to the signal received by the non-multiplexed signal receiving unit 103 is output to the non-multiplexed signal transmitting unit 524.
In addition, the separation unit 511 outputs the separated overhead to the wireless OH termination unit 521.

  The wireless OH termination unit 521 terminates the overhead output from the separation unit 511, extracts control information, and extracts the extracted control information as STM generation units 522-1 and 522-2 and STM transmission units 523-1 and 523. 2 and the non-multiplexed signal transmission unit 524. In particular, the wireless OH termination unit 521 extracts the multiplex information from the overhead, outputs the multiplex information for the data acquired by the STM reception unit 101-1, to the STM generation unit 522-1, which is acquired by the STM reception unit 101-2. Multiplex information for the data is output to the STM generation unit 522-2.

The STM generation unit 522-1 outputs the STM-1 signal to the STM transmission unit 523-1 based on the signal output from the separation unit 511 and the multiplexed information output from the wireless OH termination unit 521.
Specifically, when the STM-1 signal is output from the separation unit 511, the STM generation unit 522-1 transmits the STM-1 signal and outputs it to the STM transmission unit 523-1. On the other hand, when a part of the STM-1 signal is output from the separation unit 511, an STM-1 signal including the signal is generated and output to the STM transmission unit 523-1. When the value of the multiplexed information output from the wireless OH termination unit 521 is “AIS”, the separation unit 511 generates an AIS signal according to the SDH regulations and outputs the AIS signal to the STM transmission unit 523-1.
Similarly, the STM generation unit 522-2 outputs the STM-1 signal to the STM transmission unit 523-2 based on the signal output from the separation unit 511.

STM transmission unit 523-1 transmits the STM-1 signal output from STM generation unit 522-1 to the transmission destination of the signal received by STM reception unit 101-1. Similarly, the STM transmission unit 523-2 transmits the STM-1 signal output from the STM generation unit 522-2 to the transmission destination of the signal received by the STM reception unit 101-2.
Further, the non-multiplex signal transmission unit 524 transmits the signal output from the separation unit 511 to the transmission destination of the signal received by the non-multiplex signal reception unit 103.

  The monitoring terminal device 900 has operation input means such as a keyboard and a mouse, for example, and accepts an operation input for setting extraction instruction information using the input means. Then, the monitoring terminal device 900 generates extraction instruction information according to the received operation input and transmits it to the wireless transmission device 100 (extraction instruction information acquisition unit 109).

  Here, the STM receiving unit 101-1, the STM receiving unit 101-2, and the non-multiplexed signal receiving unit 103 are examples of the data acquisition unit in the present invention. The number of data acquired by the data acquisition unit in the present invention is not limited to three in the present embodiment, but may be one or more. Further, the data acquired by the data acquisition unit in the present invention is not limited to that shown in the present embodiment, and data of various standards can be adopted. For example, the data acquisition unit may acquire STM signals other than STM-1, such as STM-4 and STM-16. Further, the monitoring terminal device 900 generates extraction instruction information including multiplexing information for the non-multiplexed signal acquired by the data acquisition unit, and the wireless transmission system 1 transmits a part of the non-multiplexed signal according to the multiplexing information. It may be.

Next, the extraction instruction information will be described with reference to FIGS.
FIG. 2 is a data configuration diagram showing a data configuration of the extraction instruction information. As shown in the figure, the extraction instruction information is configured in a table format, and the modulation scheme that can be taken when the radio transmission apparatus 100 (radio frame transmission unit 106) transmits a radio signal, and the row of the extraction instruction information. There is a one-to-one correspondence. In each row of the extraction instruction information, information indicating the modulation scheme associated with the row is stored in the modulation scheme column. In the column of CH1, multiplex information for the channel 1 signal (the signal received by the STM receiving unit 101-1) in the case of the modulation scheme associated with the row is stored. Similarly, in the column of CH2, multiplex information for the channel 2 signal (the signal received by the STM receiving unit 101-2) in the case of the modulation scheme associated with the row is stored.

  Here, the value “STM-1” of the multiplex information is a value indicating an instruction to include the entire STM-1 signal in the transmission signal transmitted by the radio frame transmission unit 106. The multiplexed information value “OH” is a value indicating an instruction to include the overhead (RSOH) of the STM-1 signal in the transmission signal transmitted by the radio frame transmission unit 106.

The value “REG” of the multiplexed information is an instruction to include the portion used in the STM-1 standard in the overhead (RSOH) of the STM-1 signal in the transmission signal transmitted by the radio frame transmitting unit 106. This is the value shown. In other words, the overhead of STM-1 defined by SDH is open to the bytes allocated for a specific application by definition and to the user of the radio transmission system (hereinafter referred to as “operator”) undefined. There are some bytes. The value “REG” of the multiplex information indicates an instruction to include, in the transmission signal, all of the bytes of these overheads that are assigned to a specific application according to the regulations.
For example, the overhead of STM-1 includes bytes useful for monitoring the status of other devices, such as the B1 byte allocated for error monitoring of the relay section. Therefore, the wireless transmission system 1 can monitor the state of the wireless transmission device 100 side on the wireless transmission device 500 side by transmitting the part used in the standard in the overhead of the STM-1 signal. As described above, the wireless transmission system 1 can transmit various useful information by transmitting the portion used in the STM-1 standard in the overhead of the STM-1 signal.

In addition, the value “SEL (...)” Of the multiplexed information is a value indicating the designation of the part to be included in the transmission signal transmitted by the radio frame transmission unit 106 in the STM-1 signal.
For example, as described above, the STM-1 signal includes a defined and undefined byte, and the operator can include arbitrary information in the byte. By specifying the byte used by this operator with the value “SEL (...)” Of the multiplexed information, even if the entire STM-1 signal cannot be transmitted, the information included in the byte can be transmitted.

  Further, the value “AIS” of the multiplex information is a value indicating an instruction not to include any part of the STM-1 signal in the transmission signal transmitted by the radio frame transmission unit 106.

FIG. 3 is an explanatory diagram illustrating an example of the extraction instruction information. In the example of FIG. 4, four modulation schemes A, B, C, and D are set as modulation schemes by which the radio frame transmission unit 106 transmits radio signals.
Among them, the modulation system A is a modulation system that has a small transmission capacity of 30 megabits per second (Mbps), but has a high tolerance to deterioration of the state of the wireless transmission path. Modulation B is a modulation scheme having a transmission capacity larger than that of modulation scheme A and 100 megabits per second, and a resistance to deterioration of the state of the wireless transmission path is smaller than that of modulation scheme A. Modulation C has a larger transmission capacity than modulation method B and is 300 megabits per second, and is a modulation method that has a lower tolerance for deterioration of the state of the wireless transmission path than modulation method B. Modulation D has a transmission capacity larger than that of modulation method C and is 400 megabits per second, and is a modulation method whose resistance to deterioration of the state of the wireless transmission path is smaller than that of modulation method C.

And as a signal extraction location in case the radio | wireless frame transmission part 106 transmits a radio signal by the modulation system A, overhead among STM-1 signals output from the STM receiving part 101-1, and STM receiving part 101-2. D1 byte to D3 byte are designated in the STM-1 signal output from.
In addition, as a signal extraction part when the radio frame transmission unit 106 transmits a radio signal by the modulation method B, the STM-1 signal output from the STM reception unit 101-1 and the STM reception unit 101-2 are output. Each overhead of the STM-1 signal is specified.

Further, as a signal extraction location when the radio frame transmission unit 106 transmits a radio signal by the modulation scheme C, the entire STM-1 signal output from the STM reception unit 101-1 and the output from the STM reception unit 101-2 are output. Among the STM-1 signals to be transmitted, overhead is designated.
Further, as the signal extraction location when the radio frame transmission unit 106 transmits a radio signal by the modulation method D, the entire STM-1 signal output from the STM reception unit 101-1 and the output from the STM reception unit 101-2 are output. The entire STM-1 signal to be transmitted is designated.

As described above, in the extraction instruction information shown in FIG. 3, the transmission data amount (the amount of data to be extracted) is small when the transmission capacity is small so that the radio frame transmission unit 106 fits within the transmission capacity of the modulation scheme for transmitting the radio signal. When the transmission capacity is large and the transmission capacity is large, the transmission data amount is large.
The extraction instruction information shown in FIG. 3 is set to transmit overhead or D1 to D3 bytes even when the entire STM-1 signal cannot be transmitted. As a result, the wireless transmission system 1 can continue to transmit useful information even when the entire STM-1 signal cannot be transmitted.

Next, the operation of the wireless transmission system 1 will be described with reference to FIGS.
FIG. 4 is a flowchart illustrating a processing procedure in which the multiplexing control unit 113 controls signal multiplexing in the wireless transmission device 100. When the wireless transmission device 100 transmits a wireless signal, the multiplex control unit 113 repeatedly performs the process shown in FIG.

  In the process of FIG. 9, first, the multiplexing control unit 113 acquires modulation scheme information output from the modulation scheme control unit 112 (step S101). Further, the multiplex control unit 113 acquires the extraction location information stored in the extraction instruction information acquisition unit 109 (step S102). Then, the multiplexing control unit 113 starts a loop L11 for performing processing for each channel, that is, for each of the STM receiving unit 101-1 and the STM receiving unit 101-2 (step S103).

  In the loop L11, the multiplexing control unit 113 first reads out the corresponding part of the extracted part information. That is, the multiplex control unit 113 reads out the data stored in the column corresponding to the modulation scheme indicated by the modulation scheme information and the column of the channel to be processed among the extracted location information (step S104). Then, the multiplex control unit 113 branches the process based on the read data (step S105).

When it is determined that the data read in step S104 is “AIS” (step S105: AIS), the multiplex control unit 113 generates multiplex information whose value is “AIS” (step S151). Then, the multiplex control unit 113 outputs the generated multiplex information to each unit. In particular, the multiplexing control unit 113 outputs the multiplexing information to the multiplexing unit 105, thereby controlling the multiplexing unit 105 so as not to multiplex the signal of the channel to be processed (step S152).
Then, the multiplex control unit 113 determines whether or not the processing of the loop L11 has been performed for all channels, that is, both the STM receiving unit 101-1 and the STM receiving unit 101-2 (step S161). If it is determined that there is an unprocessed channel, the process returns to step S103 to perform processing on the unprocessed channel. On the other hand, if it is determined that the process of the loop L11 has been performed for all channels, the process of FIG.

On the other hand, when it is determined in step S105 that the data read in step S104 is “SEL (...)” (Step S105: SEL (...)), The multiplexing control unit 113 sets the value “SEL (. (...) "is generated (step S141). Then, the multiplex control unit 113 outputs the generated multiplex information to each unit. In particular, the multiplex control unit 113 outputs the multiplex information to the multiplex unit 105, thereby controlling the multiplex unit 105 so as to multiplex the part designated by “...” Of the STM-1 signal of the channel to be processed. (Step S142).
Thereafter, the process proceeds to step S161.

On the other hand, when it is determined in step S105 that the data read in step S104 is “REG” (step S105: REG), the multiplexing control unit 113 generates multiplexing information having a value of “REG” (step S131). . Then, the multiplex control unit 113 outputs the generated multiplex information to each unit. In particular, the multiplex control unit 113 outputs the multiplex information to the multiplex unit 105, so that each byte used in the STM-1 standard among the overhead (RSOH) of the STM-1 signal of the channel to be processed is output. The multiplexing unit 105 is controlled to perform multiplexing (step S132).
Thereafter, the process proceeds to step S161.

On the other hand, when it is determined in step S105 that the data read in step S104 is “OH” (step S105: OH), the multiplexing control unit 113 generates multiplexing information having a value “OH” (step S121). . Then, the multiplex control unit 113 outputs the generated multiplex information to each unit. In particular, the multiplexing control unit 113 outputs the multiplexing information to the multiplexing unit 105, thereby controlling the multiplexing unit 105 to multiplex the overhead (RSOH) in the STM-1 signal of the channel to be processed (step S122).
Thereafter, the process proceeds to step S161.

On the other hand, when it is determined in step S105 that the data read in step S104 is “STM-1” (step S105: STM-1), the multiplexing control unit 113 sets the multiplexing information whose value is “STM-1”. Generate (step S111). Then, the multiplex control unit 113 outputs the generated multiplex information to each unit. In particular, the multiplexing control unit 113 outputs the multiplexing information to the multiplexing unit 105, thereby controlling the multiplexing unit 105 to multiplex the entire STM-1 signal of the channel to be processed (step S112).
Thereafter, the process proceeds to step S161.

FIG. 5 is an explanatory diagram illustrating an example of the multiplexing process performed by the multiplexing unit 105. This figure shows signals included in the transmission signal by the multiplexing unit 105 when the multiplexing control unit 113 performs the processing described in FIG. 4 using the extraction instruction method described in FIG.
For example, when the radio frame transmission unit 106 transmits a radio signal using the modulation scheme A, the multiplexing unit 105 acquires the RSOH information output from the SOH extraction unit 102-1, and from the SOH extraction unit 102-2. D1 to D3 bytes are extracted from the output RSOH information, and these signals and the signal output from the non-multiplexed signal receiving unit 103 are multiplexed to generate a transmission signal.

  Further, when the radio frame transmission unit 106 transmits a radio signal using the modulation scheme B, the multiplexing unit 105 acquires RSOH information output from the SOH extraction units 102-1 and 102-2, and receives these signals. And a signal output from the non-multiplexed signal receiving unit 103 are multiplexed to generate a transmission signal.

  When the radio frame transmission unit 106 transmits a radio signal using the modulation scheme C, the multiplexing unit 105 extracts (transmits) the entire STM-1 signal output from the STM reception unit 101-1, and also performs SOH. The RSOH information output from the extraction unit 102-2 is acquired, and these signals and the signal output from the non-multiplexed signal receiving unit 103 are multiplexed to generate a transmission signal.

  When the radio frame transmission unit 106 transmits a radio signal using the modulation method D, the multiplexing unit 105 transmits the entire STM-1 signal output from the STM reception unit 101-1 and the STM reception unit 101-2. The entire output STM-1 signal is extracted (transmitted), and these signals and the signal output from the non-multiplexed signal receiving unit 103 are multiplexed to generate a transmission signal.

FIG. 6 is an explanatory diagram illustrating an example of multiplexed information included in the wireless overhead information by the wireless OH generation unit 104. This figure shows the multiplexed information that the wireless OH generator 104 includes in the wireless overhead information when the multiplexing control unit 113 performs the process described in FIG. 4 using the extraction instruction method described in FIG.
For example, when the radio frame transmission unit 106 transmits a radio signal using the modulation method A, the radio OH generation unit 104 uses the multiplexed information “OH” for channel 1 (the STM-1 signal output from the STM reception unit 101-1). ”And multiple information“ SEL (D1 to D3) ”for channel 2 (the STM-1 signal output from the STM receiving unit 101-2) is generated.
When the radio frame transmitting unit 106 transmits a radio signal using the modulation method B, the radio OH generating unit 104 includes a radio overhead including multiplexed information “OH” for channel 1 and multiplexed information “OH” for channel 2. Generate information.

When the radio frame transmission unit 106 transmits a radio signal using the modulation scheme C, the radio OH generation unit 104 includes multiplexed information “STM-1” for channel 1 and multiplexed information “OH” for channel 2. Generate radio overhead information.
Further, when the radio frame transmission unit 106 transmits a radio signal by the modulation method D, the radio OH generation unit 104 receives the multiplex information “STM-1” for the channel 1 and the multiplex information “STM-1” for the channel 2. Wireless overhead information including is generated.

  The radio frame transmission unit 106 outputs the generated radio overhead information to the multiplexing unit 105, and the multiplexing unit 105 transmits the radio overhead information included in the transmission signal as overhead. As described above, the wireless transmission device 100 transmits the wireless signal including the multiplexing information, so that the wireless transmission device 500 receives the STM-1 from the signal transmitted from the multiplexing unit 105 as described later with reference to FIG. A signal can be generated.

FIG. 7 is a flowchart illustrating a processing procedure in which the wireless transmission device 500 extracts data from a signal transmitted from the wireless transmission device 100 and transmits an STM-1 signal. Each time the wireless transmission device 500 receives a signal from the wireless transmission device 100, the wireless transmission device 500 repeats the process of FIG.
Note that the flowchart of FIG. 7 shows the procedure of processing for one channel (processing for channel 1). Radio transmission apparatus 500 performs the same processing for each channel (channel 1 and channel 2), and further extracts a non-multiplexed signal and transmits it from non-multiplexed signal transmission section 524.

  In the process of the figure, first, the radio frame reception unit 510 receives a signal transmitted from the radio transmission apparatus 100 (radio frame transmission unit 106), and the separation unit 511 separates each signal and radio overhead information from the signal. To do. Then, the wireless OH termination unit 521 terminates the wireless overhead information and obtains multiplexed information (step S201).

Then, the STM generating unit 522-1 branches the process based on the multiplexed information for the channel 1 among the multiplexed information acquired by the wireless OH terminating unit 521 (step S202).
When it is determined that the value of the multiplexed information for channel 1 is “AIS” (step S202: AIS), the STM generation unit 522-1 generates an STM-1 frame based on the device clock of the wireless transmission device 500 ( Step S251). Then, the STM generation unit 522-1 maps the A1 byte and A2 byte, which are the bytes for frame synchronization, to the generated frame (step S252), and sets all bit values to 1 for the other bytes ( Step S253). Then, the STM generation unit 522-1 outputs the obtained frame as an STM-1 signal to the STM transmission unit 523-1, and the STM transmission unit 523-1 transmits the STM-1 signal (step S254).
Thereafter, the process of FIG.

On the other hand, when it is determined in step S202 that the value of the multiplexed information for channel 1 is “REG” (step S202: REG), the STM generating unit 522-1 transmits the STM-1 frame in the same manner as in step S251. Generate (step S241). Then, the STM generation unit 522-1 reads the value of each byte used in the STM-1 standard from the channel 1 signal separated by the separation unit 511 in step S201, and the frame generated in step S241. Insert into the corresponding part (step S242).
Then, the STM generating unit 522-1 re-calculates the B1 byte, which is the error monitoring byte of the relay section, and inserts it into the frame (step S243). Then, the STM generation unit 522-1 outputs the obtained frame as an STM-1 signal to the STM transmission unit 523-1, and the STM transmission unit 523-1 transmits the STM-1 signal (step S244).
Thereafter, the process of FIG.

On the other hand, when it is determined in step S202 that the value of the multiplexed information for channel 1 is “SEL (...)” (Step S202: SEL (...)), The STM generating unit 522-1 performs step S251. The STM-1 frame is generated in the same manner as in (Step S231). Then, the STM generation unit 522-1 reads out the data of the portion specified by the multiplexing information from the signal of the channel 1 separated by the separation unit 511 in step S201, and inserts it in the corresponding portion of the frame generated in step S231. (Step S232).
Steps S233 to S234 are the same as steps S243 to S244.
Thereafter, the process of FIG.

On the other hand, when it is determined in step S202 that the value of the multiplexed information for channel 1 is “OH” (step S202: OH), the STM generating unit 522-1 selects the STM-1 frame in the same manner as in step S251. Generate (step S221). Then, the STM generation unit 522-1 reads the overhead (RSOH) from the channel 1 signal separated by the separation unit 511 in step S201, and inserts the overhead (RSOH) into the corresponding portion of the frame generated in step S221 (step S222).
Steps S223 to S224 are the same as steps S243 to S244.
Thereafter, the process of FIG.

On the other hand, when it is determined in step S202 that the value of the multiplexed information for channel 1 is “STM-1” (step S202: STM-1), the STM generation unit 522-1 separates the separation unit 511 in step S201. The obtained STM-1 signal of channel 1 is acquired and output to the STM transmission unit 523-1, and the STM transmission unit 523-1 transmits the STM-1 signal (step S211).
Thereafter, the process of FIG.

As described above, the extraction instruction information acquisition unit 109 acquires the extraction instruction information, the multiplexing unit 105 generates a radio signal according to the extraction instruction information, and the radio frame transmission unit 106 transmits the radio signal. Thereby, the transmission path state between the wireless transmission device 100 and the wireless transmission device 500 deteriorates, and all the signals received by the STM reception unit 101-1, the STM reception unit 101-2, and the non-multiplex signal reception unit 103 are all received. Even if the wireless transmission device 100 cannot transmit, the wireless transmission device 100 can preferentially transmit the information indicated in the extraction instruction information. Thus, the wireless transmission system 1 can preferentially transmit information desired by the operator, such as RSOH or bytes specified by the operator. Therefore, even when the state of the wireless transmission path is deteriorated and the transmission capacity is reduced by the function of the adaptive modulation method and information is selectively transmitted, the wireless transmission device 500 or the network connected to the end thereof is used. In a device (a device to which a signal from the wireless transmission device 500 is transmitted directly or indirectly), the device can be monitored and controlled.
In the present embodiment, the case where the wireless transmission system 1 transmits RSOH or bytes specified by an operator of the RSOH has been described as an example. However, the scope of application of the present invention is not limited to this, and various portions are included. The present invention can be used for transmission. For example, the wireless transmission system 1 may transmit MSOH (Multiplex Section Overhead) or bytes designated by the operator in the MSOH.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Wireless transmission system 100 Wireless transmission apparatus 101-1, 101-2 STM receiving part 102-1, 102-2 SOH extraction part 103 Non-multiplex signal receiving part 104 Wireless OH generation part 105 Multiplexing part 106 Radio frame transmission part 109 Extraction instruction Information acquisition unit 110 Radio frame reception unit 111 Separation unit 112 Modulation method control unit 113 Multiplexing control unit 500 Wireless transmission device 505 Multiplexing unit 506 Radio frame transmission unit 510 Radio frame reception unit 511 Separation unit 512 Modulation method control unit 519 Signal quality monitoring unit 521 Wireless OH termination unit 522-1, 522-2 STM generation unit 523-1, 523-2 STM transmission unit 524 Non-multiplexed signal transmission unit 900 Monitoring terminal device

Claims (3)

A data acquisition unit for acquiring data;
A transmitter that transmits a radio signal by a designated modulation method among a plurality of modulation methods;
An extraction instruction information acquisition unit that acquires, for each of the modulation schemes in which the transmission unit transmits a radio signal, extraction instruction information that specifies a location to be included in the radio signal transmitted by the transmission unit, of the data acquired by the data acquisition unit When,
A modulation scheme information acquisition unit that acquires modulation scheme information that specifies a modulation scheme of a radio signal transmitted by the transmission unit;
The portion specified by the extraction instruction information in association with the modulation method specified by the modulation method information acquired by the modulation method information acquisition unit is extracted from the data acquired by the data acquisition unit, and includes the extracted data A transmission signal generator for generating a transmission signal;
Comprising
The transmission unit transmits the transmission signal generated by the transmission signal generation unit in a modulation scheme specified by the modulation scheme information acquired by the modulation scheme information acquisition unit.
A communication device. A communication system comprising a first communication device and a second communication device,
The first communication device is
A data acquisition unit for acquiring data;
A transmitter that transmits a radio signal by a designated modulation method among a plurality of modulation methods;
An extraction instruction information acquisition unit that acquires, for each of the modulation schemes in which the transmission unit transmits a radio signal, extraction instruction information that specifies a location to be included in the radio signal transmitted by the transmission unit, of the data acquired by the data acquisition unit When,
A modulation scheme information acquisition unit that acquires modulation scheme information that specifies a modulation scheme of a radio signal transmitted by the transmission unit;
The portion specified by the extraction instruction information in association with the modulation method specified by the modulation method information acquired by the modulation method information acquisition unit is extracted from the data acquired by the data acquisition unit, and includes the extracted data A transmission signal generator for generating a transmission signal;
Comprising
The transmission unit transmits the transmission signal generated by the transmission signal generation unit in a modulation scheme specified by the modulation scheme information acquired by the modulation scheme information acquisition unit,
The second communication device is
A receiver for receiving a radio signal;
A data extraction unit that extracts each data included in the transmission signal generation unit from a radio signal received by the reception unit;
A communication system comprising: A wireless transmission method performed by a communication device,
A data acquisition step for acquiring data;
A transmission step of transmitting a radio signal by a designated modulation method among a plurality of modulation methods;
For each of the modulation schemes for transmitting a radio signal in the transmission step, extraction instruction information acquisition for acquiring extraction instruction information for designating a location to be included in the radio signal transmitted in the transmission step among the data acquired in the data acquisition step Steps,
A modulation scheme information acquisition step for acquiring modulation scheme information for designating a modulation scheme of a radio signal transmitted in the transmission step;
The location specified in the extraction instruction information in association with the modulation method specified by the modulation method information acquired in the modulation method information acquisition step is extracted from the data acquired in the data acquisition step, and includes the extracted data A transmission signal generating step for generating a transmission signal;
Comprising
In the transmission step, the transmission signal generated in the transmission signal generation step is transmitted in a modulation scheme specified by the modulation scheme information acquired in the modulation scheme information acquisition step.
And a wireless transmission method.

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