JPH1079715A - Burst signal relaying system for multi-directional multiplex communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent interruption of a relayed data communication signal, omission of a burst signal to be relayed, or generation of an erroneous burst signal or the like. SOLUTION: A data signal burst control signal is generated by a signal burst control circuit 21 based on time slot information for data communication sent in the case of line setting for data communication from a master station side detected by a timing information detection circuit 19. On the other hand, an incoming relay burst signal S1 received by a slave station detected by an incoming burst signal detection circuit 15 receives forward protection and backward protection only for a radio time slot for data communication of a data communication based on a transmission timing generated separately by a transmission timing generating circuit 14 at a forward/backward protection circuit 22. An incoming burst control circuit 23 controls relay transmission by the data signal burst control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demand assignment system for allocating a wireless communication channel between a slave station or a relay station and a master station only when a call is generated at the slave station or the relay station. The present invention relates to a burst signal relay system for relaying an upstream burst signal from a lower station to an upper station in a multi-way multiplex communication system that handles telephone communication and data communication in a mixed manner. The present invention relates to a burst signal relay system for a multi-way multiplex communication system that relays a stable data communication signal even when receiving a wave.

[0002]

2. Description of the Related Art In general, a multi-way multiplex communication system, as shown in FIG. 2, has one master station A and a plurality of slave stations B1,. B2,
, A time-division multiplexing radio communication system for performing 1: N communication with BN, one or a plurality of relay stations C− may be installed depending on the system scale, etc. Also communicates with the master station A.

In the example shown in FIG. 2, slave stations B1 and B2 are directly wirelessly connected to master station A, and slave stations B3 and B4 are wirelessly connected to master station A via relay station C.

In such a multi-way multiplex communication system,
For transmission of communication information in the downlink direction from the master station A to each of the slave stations B- and the relay station C, predetermined communication information is transmitted by a time division multiplexing (TDM) method. B- or the relay station C separates and selects the communication information targeted by the own station and extracts it. On the other hand, each slave station B- or relay station C
For transmission of upstream communication information from the
A transmission burst signal (a signal whose transmission time is intermittent) only within a predetermined transmission time range (hereinafter referred to as a radio time slot) assigned to each slave station B- or relay station C. Time division multiple access (TDM
A) transmitting predetermined communication information to the master station A using a method,
Bi-directional communication is performed by the master station A separating and extracting communication information from the slave station B- and the relay station C for each station.

FIG. 3 is a diagram showing the structure of a radio frame. As shown in the figure, one downstream frame from the master station A to the slave station B- is composed of a predetermined frame synchronization signal F followed by m time frames. On the other hand, one upstream frame in the direction of the master station A is composed of m time slots TS1, TS2 whose timing is set based on the frame synchronization signal F of the downstream frame. ,
, TSm, and the time slot TSm is
It is used by a burst signal originating from the slave station B- or the relay station C designated by the master station A.

Next, the relay station C of the burst signal relay system of the multi-directional multiplex communication system will be described with reference to FIGS.

Conventionally, a relay station C in a burst signal relay system of this kind of multi-directional multiplex communication system is shown in FIG. 4, and as described in, for example, Japanese Patent Laid-Open Publication No. An antenna 1 directed to a certain master station A, an antenna 2 directed to slave stations B3 and B4 as lower stations, a circulator 3 connected to the antenna 1, a circulator 4 connected to the antenna 2, and a receiver connected to the antenna 1 5, receiver 6 connected to antenna 2, antenna 1
, A transmitter 8 connected to the antenna 2,
And a time division multiplexing signal processing circuit 90. The time division multiplexing signal processing circuit 90 directly accommodates and connects the telephone set 11 and the data terminal 12 via the interface circuit 10 without passing through the slave station B-. .

In the time-division multiplexed signal processing circuit 90, the frame synchronization circuit 13 detects a frame synchronization signal F dependent on the received signal from the master station A demodulated by the receiver 5, and uses this frame synchronization signal F as a reference. A transmission timing signal is obtained by the transmission timing generation circuit 14. Also,
The timing information detecting circuit 19 detects the burst relay timing information of the data signal to be relayed from the received signal received from the master station A and stores it in the memory 20.

On the other hand, the upstream burst signal S1 received by the receiver 6 from the slave station B- of the lower station is demodulated into an upstream relay burst signal by the receiver 6 and sent to the selection circuit 16 and the upstream burst signal detection circuit 15. The upstream burst signal detection circuit 15 adds the detection signal S30 corresponding to the radio time slot to be relayed from the slave station B- to the master station A based on the transmission timing signal obtained from the reception signal from the master station A. Output to

A signal burst control circuit 21 generates a data signal burst control signal based on burst relay timing information of a data signal to be relayed stored in a memory 20 and outputs the data signal burst control signal to an adder 25 together with the detection signal S30. Is done.

On the other hand, a telephone 1 connected to a subscriber line
1 and the insertion burst signal S2 transmitted from the own station corresponding to the data terminal 12 are sent to the selection circuit 16 and the insertion burst signal detection circuit 17 via the interface circuit 10.

The selection signal S31 output from the adder 25 is
The signal is output to the selection circuit 16 and the adder 18, and when at least one of the relaying upstream burst signal S1 and the data signal burst control signal is present, the signal goes high in response to the radio time slot. If not present, it goes low. When the selection signal S31 is at a high level, the up-burst signal S1 is selected by the selection circuit 16, while when it is at a low level, the insertion burst signal S2 is selected and sent to the transmitter 8.

The insertion burst signal detection circuit 17
It receives an insertion burst signal S2 transmitted from its own station corresponding to the telephone set 11 and the data terminal 12 via the interface face circuit 10 and transmits the insertion burst signal S2 based on the transmission timing signal obtained from the transmission timing generation circuit 14. Is output to the adder 18.

The adder 18 receives the selection signal of the adder 25 and the detection signal of the inserted burst signal S2, and outputs a burst control signal S4 to the transmitter 8. In response to the burst control signal S4, the transmitter 8 sends a relaying upstream burst signal S1 received from the slave station B- of the lower station to the upper station, and a data signal burst control signal generated based on the burst relay timing information. In the time slot of the corresponding data signal, a predetermined burst signal is transmitted, and when there is no such signal, the insertion burst signal S2 is generated based on a predetermined transmission timing outputted from the insertion burst signal detection circuit 17 as the slave station Bn. Is output.

With this configuration, a predetermined burst signal is transmitted in the time slot of the data signal generated based on the burst relay timing information even if there is no uplink burst signal S1 for relaying. The object to solve the following problem which occurs because the signal is sent to the master station A of the upper station only when detected by the uplink burst signal detection circuit 15 has been achieved.

That is, the problem solved is that the fading of the radio link has occurred and the input electric field of the received signal of the antenna has dropped below the threshold value. If an interfering wave unrelated to the path is input to the antenna, it may be erroneously determined to be an uplink burst signal, generate a burst signal that is not relevant, and collide with a normal burst signal generated by sending it to the host station of the upper station. It is.

[0017]

The above-described conventional burst signal relay system for a multi-way multiplex communication system uses a time slot of a data signal generated based on burst relay timing information even when there is no uplink burst signal to be relayed. In order to stably relay the data communication signal by transmitting a predetermined burst signal, the relay of the data communication signal for wireless data communication was interrupted, the burst signal to be relayed was lost, or an incorrect burst signal was transmitted. There is a problem such as signal generation.

An object of the present invention is to provide a burst signal relay system for a multi-way multiplex communication system which can prevent interruption of relaying of data communication signals, loss of burst signals to be relayed, or generation of erroneous burst signals. It is.

[0019]

SUMMARY OF THE INVENTION A burst signal relay method for a multi-way multiplex communication system according to the present invention is provided between a slave station or a relay station and a master station only when a call is generated in the slave station or the relay station. In a burst signal relay system for relaying an upstream burst signal from a lower station to an upper station in a multi-directional multiplex communication system in which communication control is performed by a demand assignment method for allocating a wireless communication channel and a telephone communication and a data communication are mixedly handled. The master station further comprises means for transmitting time slot information for data communication to the relay station in advance of starting communication when setting a line for data communication with the relay station. Means for operating forward protection and backward protection functions related to a relay operation for a time slot for data communication when setting a communication line. It is provided.

In the above means, the relay station is provided with means for operating the functions of forward protection and backward protection relating to the relay operation with respect to the time slot for data communication when setting the line for data communication. This prevents loss of relay of a burst signal for data communication received from a slave station of a lower station or relay of an erroneous burst signal.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

The station configuration shown in FIG. 2 and the frame configuration shown in FIG. 3 according to the above description are the same as those in the prior art, and will be described with reference to them.

In the burst signal relay system of the multi-way multiplex communication system shown in FIG. 1, a relay station C has an antenna 1 directed to a master station A as an upper station, a slave station B3 as a lower station.
Antenna 2 in the direction to B4, circulator 3 connected to antenna 1, circulator 4 connected to antenna 2, receiver 5 connected to antenna 1, receiver 6 connected to antenna 2, transmitter 7 connected to antenna 1 , A transmitter 8 connected to the antenna 2 and a time division multiplex signal processing circuit 9.
However, the configuration in which the telephone 11 and the data terminal 12 are directly accommodated and connected via the interface circuit 10 without passing through the slave station B- is the same as the conventional one,
Are partially different from those of the related art.

That is, the time division multiplex signal processing circuit 9
A frame synchronization circuit 13, a transmission timing generation circuit 14,
Upward burst signal detection circuit 15, selection circuit 16, insertion burst signal detection circuit 17, adder 18, timing information detection circuit 19, memory 20, signal burst control circuit 2
1. It is assumed that a front and rear protection circuit 22 and an up burst control circuit 23 are provided.

The difference from the prior art is that a forward / backward protection circuit 22 is used instead of an adder for adding the outputs of the upstream burst signal detection circuit 15 and the signal burst control circuit 21.
And an upstream burst control circuit 23. An output signal from the upstream burst signal detection circuit 15 via the front / back protection circuit 22 and an output signal from the signal burst control circuit 21 are selected via the upstream burst control circuit 23. Signal S3
That is, the selection of the transmission signal of the selection circuit 16 and the transmitter 8 is controlled.

The antenna 1 in the direction to the master station A which is the upper station
Is received by the receiver 5 via the circulator 3, and the receiver 6 demodulates the received signal. The signal is demodulated and obtained as an uplink relay burst signal S1, and is supplied from the receivers 5 and 6 to the time division multiplexed signal processing circuit 9 respectively.

The frame synchronization circuit 13 of the time division multiplexed signal processing circuit 9 detects the frame synchronization signal F dependent on the received signal from the master station A demodulated by the receiver 5 and notifies the transmission timing generation circuit 14 of it. The transmission timing generation circuit 14 generates a transmission timing signal based on the received frame synchronization signal F and sends it to the interface circuit 10, the upstream burst signal detection circuit 15, and the insertion burst signal detection circuit 17.

The upstream burst signal detecting circuit 15 receives the upstream of the data communication signal among the relay burst signals S 1 demodulated by the receiver 6 and receives the upstream of the slave station B-B based on the transmission timing signal obtained from the transmission timing generation circuit 14. , An upstream relay burst signal S1 corresponding to a radio time slot to be relayed to the master station A is detected and output to the front / rear protection circuit 22.

The selection circuit 16 transmits the uplink relay burst signal S 1 demodulated by the receiver 6 and the self-station corresponding to the telephone set 11 and the data terminal 12 connected to the subscriber line via the interface face circuit 10. The burst signal is transmitted to the radio time slot allocated to the own station by the selection signal S3 output from the uplink burst control circuit 23, while the burst signal is transmitted to the radio time slot allocated to the other station. Shall prohibit the transmission of the burst signal.

The insertion burst signal detection circuit 17 receives the insertion burst signal S 2 transmitted from the own station corresponding to the telephone set 11 and the data terminal 12 via the interface face circuit 10, and receives the transmission timing obtained from the transmission timing generation circuit 14. The burst signal S2 is inserted based on the signal.
Is output to the adder 18.

The adder 18 adds the output of the insertion burst signal detection circuit 17 and the selection signal S3 output from the upstream burst control circuit 23 and outputs the result to the transmitter 8 as a burst control signal S4.

The timing information detecting circuit 19 detects the burst relay timing information of the data signal to be relayed from the received signal received from the master station A and stores it in the memory 20. It is also assumed that the signal burst control circuit 21 generates a data signal burst control signal based on the burst relay timing information of the data signal to be relayed stored in the memory 20 and outputs it to the upstream burst control circuit 23.

The forward / backward protection circuit 22 receives the output of the upstream burst signal detection circuit 15 and receives the output of the upstream burst signal based on information such as the presence / absence of a received electric field and the result of unique word detection. Is determined and output to the upstream burst control circuit 23.

The upstream burst control circuit 23 enables the function of the front / rear protection circuit 22 only for the data communication signal corresponding to the radio time slot for the data signal based on the data signal burst control signal received from the signal burst control circuit 21. The selection signal S3 to be output to the selection circuit 16 and the adder 18.

Next, with reference to FIG. 1, a description will be given of a process of relaying a burst signal transmitted to the master station A via the transmitter 8 on the downlink in the time division multiplex signal processing circuit 9.

First, a frame synchronizing signal F dependent on the received signal is detected by the frame synchronizing circuit 13 from the received signal demodulated by the receiver 5 and received from the master station A, and the detected frame synchronizing signal F is used as a reference. The transmission timing signal is obtained by the transmission timing generation circuit 14. Also, from the demodulated received signal received from master station A,
The burst information of the data signal to be relayed is detected by the timing information detecting circuit 19, and the detected burst relay timing information is stored in the memory 20.

On the other hand, the upstream burst signal S1 received by the time division multiplexing signal processing circuit 9 from the slave station B- of the lower station is demodulated by the receiver 6 into an upstream relay burst signal S1 and sent to the selection circuit 16. Also, an insertion burst signal S2 transmitted from the own station corresponding to the telephone set 11 and the data terminal 12 connected to the subscriber line is supplied to the selection circuit 16 through the interface circuit 10.

The upstream relay burst signal S1 is sent to the upstream burst signal detection circuit 15, and from the slave station B- based on the transmission timing signal obtained from the reception signal from the master station A by the upstream burst signal detection circuit 15. The signal is transmitted to the front / rear protection circuit 22 as a signal corresponding to a radio time slot to be relayed to the master station A.

The front / rear protection circuit 22 receives the output signal of the upstream burst signal detection circuit 15 and receives the output signal of the receiver 6 based on information such as the presence or absence of a received electric field and the result of unique word detection.
, And outputs it to the upstream burst control circuit 23. On the other hand, the up-burst control circuit 23 selects, based on the data signal burst control signal received from the signal burst control circuit 21, only the data communication signal corresponding to the radio time slot related to the data signal to enable the function of the front-back protection circuit 22. The signal S3 is output.

The selection circuit 16 receives the high-level selection signal S3 designating only the data communication signal to which the forward protection and the rearward protection have been applied, selects the uplink relay burst signal S1 and outputs it to the transmitter 8, while outputting the low level. When the level selection signal is received, the signal of the telephone communication of the uplink relay burst signal S1, or the telephone communication from the own station included in the insertion burst signal S2, or the signal of the data communication communication is selected and output to the transmitter 8. I do. The transmitter 8 can transmit a communication signal from the selection circuit 16 under the control of the output of the adder 18.

On the other hand, the adder 18 receives the transmission timing of the insertion burst signal S 2 transmitted from its own station based on the transmission timing signal obtained by the transmission timing generation circuit 14 from the insertion burst signal detection circuit 17.
Relay upstream burst signal S received from slave station B- of the lower station
A selection signal S3 designating only the data communication signal from 1 is input from the up burst control circuit 23.

In the above configuration, since the burst information of the data signal to be relayed is detected by the timing information detecting circuit, the burst signal is transmitted to the radio time slot for the data communication signal designated by the upper station. In addition, by applying forward protection and backward protection to the data communication signal of the uplink relay burst signal wirelessly received from the antenna, even if fading or interference occurs on the wireless line, the relay of the burst signal is interrupted and transmitted. It is possible to prevent a burst signal to be lost or a burst signal from colliding due to transmission of an erroneous burst signal.

In the above description, the functions are illustrated in the block diagram. However, the distribution of the functions by separating and merging the functions is free as long as the above functions are satisfied, and the above description does not limit the present invention.

[0045]

As described above, according to the present invention, before performing communication, the time slot information for data communication sent from the master station side of the upper station when setting the line for data communication is used as the timing information detecting circuit. A selection signal is formed by a signal detected by the front and rear protection circuits by a front and rear protection circuit only for a data communication radio time slot with respect to a data communication signal received from a slave station of a lower station. An upstream burst control circuit is formed to control the relay of data communication signals.

With this configuration, for data communication requiring stricter line quality than that for telephone communication, loss of a burst signal, transmission of an erroneous burst signal, and the like can be performed even when fading or interference of a wireless line occurs. Thus, it is possible to stably relay the data communication signal.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a station configuration diagram showing one embodiment of a multi-way multiplex communication system.

FIG. 3 is a frame configuration diagram showing one form of a radio frame in a multi-way multiplex communication system.

FIG. 4 is a functional block diagram showing an example of the related art.

[Explanation of symbols]

 1, 2 Antenna 3, 4 Circulator 5, 6 Receiver 7, 8 Transmitter 9 Time-Division Multiplexed Signal Processing Circuit 10 Interface Circuit 11 Telephone 12 Data Terminal 13 Frame Synchronization Circuit 14 Transmission Timing Generation Circuit 15 Upstream Burst Signal Detection Circuit 16 Selection Circuit 17 Insertion burst signal detection circuit 18 Adder 19 Timing information detection circuit 20 Memory 21 Signal burst control circuit 22 Forward / backward protection circuit 23 Up burst control circuit

Claims (2)

[Claims] A communication control is performed by a demand assignment method in which a wireless communication channel is allocated between a slave station or a relay station and a master station only when a call is generated in the slave station or the relay station, and telephone communication and data communication are performed. In a burst signal relay system for relaying an up-burst signal from a lower station to an upper station in a multi-way multiplex communication system that treats both in a mixed manner, the master station, when setting a line for data communication with the relay station, Prior to the start of communication, comprising means for transmitting time slot information for data communication to the relay station in advance,
The multi-directional multiplex communication system further comprising means for operating, at the time of setting a line for data communication, a forward protection function and a rear protection function for a relay operation with respect to a time slot for data communication in the relay station. Burst signal relay method. 2. The relay station according to claim 1, wherein the relay station generates transmission timing from a frame configuration received from the master station, and detects burst relay timing information of a data signal from information received from the master station. Signal burst control means for outputting a data signal burst control signal for controlling the burst output of the data communication signal, and receiving the uplink of the data communication signal among the relay burst signals demodulated by the receiver, and transmitting the signal to the transmission timing signal. An uplink burst signal detection circuit for detecting and outputting an uplink relay burst signal corresponding to a radio time slot to be relayed based on the received uplink relay burst signal, and based on information such as the presence or absence of a received electric field and a unique word detection result. Forward and backward protection to determine and output the upstream burst signal based on the received data signal An upstream burst receiving a circuit and a data signal burst control signal, and outputting a selection signal for enabling the function of the front and rear protection circuit only to a data communication signal corresponding to a radio time slot related to the data signal based on the signal; The control circuit transmits the burst signal to the radio time slot allocated to the own station by the selection signal, and prohibits the transmission of the burst signal to the radio time slot allocated to another station. A burst signal relaying method for a multi-directional multiplex communication system.