JP2001358684A - Multi-directional time-sharing multiple radio data communication system and data communication method therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-directional time-sharing multiple radio data communication system for very effectively utilizing a radio time slot. SOLUTION: Only when a data terminal device 51 has transmission data, does a data subscriber interface part 41 make a request for allocation of a radio time slot at a base station device 8. A radio time slot control circuit 9 in the base station device 8 transmits radio time slot information to the data subscriber interface 41 and a data subscriber interface 21 to be communicated, thus deciding the radio time slot. When there is no transmission data in the data terminal devices 51 and 21, the radio time slot control circuit 9 opens the radio time slot, where data is being communicated according to the open request of the radio time slot from the data subscriber interfaces 41 and 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-way time-division multiplexing wireless data communication system and a data communication method in the system, and more particularly to a data terminal device connected to a subscriber station device and a data terminal connected to a base station device. The present invention relates to a multi-way time division multiplexed wireless data communication system for performing data communication with a terminal device and a data communication method in the system.

[0002]

2. Description of the Related Art Generally, in a radio system for performing multi-directional multiplex communication, one base station apparatus and a plurality of (integral N) subscriber station apparatuses facing the base station apparatus have a 1: N ratio.
, Ie, multi-directional time division multiplex wireless communication. In the above wireless system in which telephone communication and data communication are mixed, demand assignment for allocating a wireless time slot between the base station apparatus and the subscriber station apparatus only when a call is generated in the base station apparatus or the subscriber station apparatus with respect to the telephone communication. Channel allocation is controlled according to the method, and for data communication, a data terminal device (DTE) connected to a base station device and a data terminal device (DTE) connected to a subscriber station device facing the data terminal device. The channel assignment is controlled by a pre-assignment method in which a wireless time slot for performing data communication is fixedly assigned in advance. Hereinafter, this type of prior art will be described with reference to FIG. 1 which is a configuration diagram of a multi-way time division multiplexed wireless data communication system according to the present invention.

In FIG. 1, a multi-way time division multiplexed wireless data communication system includes a base station apparatus 8, a data subscriber interface accommodating section 10 connected to the base station apparatus 8, and a data subscriber interface accommodating section 10. Data subscriber interface units 11 to 13, data terminal devices (DTEs) 21 to 23 connected to the data subscriber interface units 11 to 13, respectively, and the base station device 8 via a wireless line (wireless section). A plurality of subscriber station devices 31 to 33 accommodating the opposing data subscriber interface units 41 to 43, and data terminal devices (DTs) connected to the data subscriber interface units 41 to 43, respectively.
E) 51-53. The downlink direction from the base station device 8 to the subscriber station devices 31 to 33 is a TDM (time division multiplexing) system, and the subscriber station device 3
In the upstream direction from 1 to 33 to the base station device 8, data communication is performed by the TDMA (Time Division Multiple Access) method.

[0004] Next, the operation in the case where the data terminal device 21 and the data terminal device 51, the data terminal device 22 and the data terminal device 52, and the data terminal device 23 and the data terminal device 53 perform data communication while facing each other will be described. .

In an example of the prior art, an appropriate radio time slot of a radio communication channel is fixedly allocated in advance to each of the opposing data terminal devices.
In this method, the resource management of all the radio time slots for the data communication is performed by the time slot management circuit 9 in the base station device 8. When the operator of the base station apparatus 8 operates the data terminal apparatus 51 on the subscriber station apparatus 31-33 side.
５３53 and the data terminal devices 21 to 23 on the base station device 8 side, the time slot management circuit 9 performs fixed allocation control of time slots. That is, a wireless time slot for the data terminal device 21 and the data terminal device 51, a wireless time slot for the data terminal device 22 and the data terminal device 52, and a wireless time slot for the data terminal device 23 and the data terminal device 53 Each is fixedly assigned. Now, the assigned wireless time slots are conveniently referred to as TS1, TS2 and T
Called S3. Each wireless time slot is assigned to a different position that does not overlap in time, and signals transmitted using the respective wireless time slots do not collide.

For downlink data transmission (communication), data signals (hereinafter, also referred to as transmission data) transmitted from each of the data terminal device 21, the data terminal device 22, and the data terminal device 23 are transmitted to the data subscriber interface. After being inputted to the data subscriber interface unit 12 and the data subscriber interface unit 13 and multiplexed by the data subscriber interface accommodating unit 10, respectively,
Via the base station device 8, the multiplexed data signals are transmitted to the subscriber station device 31, the subscriber station device 32, and the subscriber station device 33 using the TDM method. That is,
The data signal from the data terminal device 21 is multiplexed in the radio time slot TS1, the data signal from the data terminal device 22 is multiplexed in the radio time slot TS2, and the data signal from the data terminal device 23 is multiplexed in the radio time slot TS3. Is used to transmit a burst-like data signal multiplexed to each of the subscriber station devices 31-33. In addition, for each of the subscriber station devices 31 to 33,
In each case, exactly the same signal is transmitted.

Each of the subscriber station devices 31 to 33 separates and selects only the data signal addressed to itself and extracts it.
A data signal is transmitted to the connected data terminal device (any one of 51 to 53). That is, the data signal multiplexed in the radio time slot TS1 is separated by the data subscriber interface unit 41 in the subscriber station device 31 and is sent to the data terminal device 51. The data signal multiplexed in the radio time slot TS2 is sent to the subscriber station device. The data signal separated by the data subscriber interface unit 32 in the data terminal device 52 and the data signal multiplexed into the radio time slot TS3 are separated by the data subscriber interface unit 43 in the slave station device 33 and transmitted to the data terminal device 53. Sent out.

[0008] On the other hand, with respect to data transmission (communication) in the uplink direction, data signals from each of the data terminal devices 51 to 53 are respectively assigned to the radio signals allocated to each of the connected subscriber station devices 31 to 33. The signal is multiplexed into a time slot to be a burst signal and transmitted to the base station device 8 using the TDMA method. That is, the data signal from the data terminal device 51 is input to the subscriber station device 31, multiplexed by the data subscriber interface unit 41 into the radio time slot TS1, and transmitted to the base station device 8.
Similarly, the data signal from the data terminal device 52 is input to the subscriber station device 32 and multiplexed in the radio time slot TS2 by the data subscriber interface unit 42. The data signal from the data terminal device 53 is transmitted to the subscriber station device 33 Are multiplexed in the wireless time slot TS3 by the data subscriber interface unit 43 and transmitted to the base station device 8, respectively. A data signal from each of the subscriber station devices 31 to 33 is transmitted to the data subscriber interface unit 1 by the data subscriber interface unit 10 via the base station device 8.
1, a data subscriber interface unit 12 and a data subscriber interface unit 13, which are separated into a data subscriber interface unit 11 and a data subscriber interface unit 12.
And a data signal corresponding to each of the connected data terminal devices 21 to 23 is transmitted from each of the data subscriber interface units 13. That is, the data signal multiplexed in the radio time slot TS1 is transmitted to the data terminal device 21 and the data signal multiplexed in the radio time slot TS2 is transmitted to the data terminal device 22.
3 are transmitted to the data terminal device 23, respectively.

In the above-described multi-way time-division multiplexing wireless data communication system, since wireless time slots are fixedly allocated between opposing data terminal apparatuses regardless of the data communication state, even when data transmission (communication) is not performed. There has been a drawback that the wireless time slots are used and the efficiency of using the wireless time slots is poor.

[0010] Therefore, a technique for improving the use efficiency of the wireless time slot is disclosed in Japanese Patent Application Laid-Open No. 9-233302 (Title of Invention: Multidirectional time-division multiplex wireless data communication method). In the disclosed multi-way time division multiplexing wireless data communication method, when applied to FIG. 1, one data terminal device connected to the base station device 8 and a plurality of predetermined data terminal devices facing the base station device 8 In order to perform data communication with any one of the data terminal apparatuses 51 to 53, a common wireless time slot TS0 is fixedly assigned, and each of the plurality of predetermined data terminal apparatuses 51 to 53 requests transmission at a non-overlapping timing. The subscriber station apparatus (one of 31 to 33) that has transmitted the signal and received the transmission request signal transmitted from the data terminal apparatuses 51 to 53 uses the assigned common radio time slot TS0 to transmit the base station. When it is ready to send a data signal to the device 8, a transmission enable signal is sent to the data terminal device (51 to 51) that sent the transmission request signal.
53) to the subscriber station device (31-33).
The data device (any one of 51 to 53) that has received the transmission enable signal returned from any one of (1) to (3) transmits a data signal to the subscriber station device.

[0011]

The multi-way time-division multiplex wireless data communication method according to the present invention uses a common wireless time slot TS0 for performing data communication with a plurality of predetermined data terminals. Since they are fixedly allocated and commonly used, it is possible to improve the use efficiency of wireless time slots as compared with the described conventional technology. However, even when this method is used, the wireless time slot is fixedly occupied when data communication is not being performed, so that there is a drawback that the improvement of the wireless time slot utilization efficiency is limited.

Accordingly, it is an object of the present invention to provide a multi-way time division multiplexed wireless data communication system and a data communication method in this system, which can further improve the use efficiency of wireless time slots.

[0013]

SUMMARY OF THE INVENTION A multi-way time division multiplexed wireless data communication system according to the present invention comprises one base station apparatus, a plurality of subscriber station apparatuses, and first and second stations connected thereto.
A first data terminal device connected to the base station device and a second data terminal device connected to the subscriber station device facing the first terminal device. In a multi-way time-division multiplexed wireless data communication system capable of performing data communication between the subscriber station and the base station, data communication is performed by the TDMA method from the subscriber station to the base station. Performs data communication by the TDM system, and a time slot management circuit in the base station apparatus transmits a radio time slot request signal from one of the data terminal apparatuses which requires the data communication. It is characterized in that a time slot is allocated, and when the end of the data communication is confirmed, the wireless time slot is released.

In one of the multi-way time division multiplexing wireless data communication systems, a first data subscriber interface unit is connected between the base station apparatus and the first data terminal apparatus connected thereto. And a second data subscriber interface unit connected to the second data terminal device is connected in the subscriber station device, and the data subscriber interface to which the data terminal device is connected is connected. When a data transmission request is sent to the time slot management unit, the data subscriber interface unit can request the time slot management circuit to allocate a wireless time slot.

The multi-way time-division multiplexing wireless data communication system transmits the transmission permission to the data terminal device which has issued the transmission request by the data subscriber interface unit which has been allocated the radio time slot from the time slot management circuit. The data subscriber interface unit, which has received the allocation of the wireless time slot from the time slot management circuit, notifies the data terminal device of the presence of a data channel reception carrier, thereby enabling data communication between the data terminal devices. It can take a configuration to be started.

Another one of the multi-way time-division multiplexing wireless data communication systems is that each of the opposing data terminal apparatuses notifies the connected data subscriber interface unit of the end of transmission of the transmission data together. The notified data subscriber interface unit may request the time slot management circuit to release the wireless time slot used for transmitting the transmission data.

One of the multi-way time-division multiplexed wireless data communication systems receives release information of the wireless time slot from the time slot management circuit, and a data subscriber interface unit that transmits the transmission permission transmits the transmission request. The data terminal apparatus that has performed transmission is notified that transmission is not possible, and the data subscriber interface unit that has received the release information of the wireless time slot from the time slot management circuit notifies the data terminal apparatus that there is no data channel reception carrier. The data communication between the data terminal devices may be stopped.

Another one of the multi-way time-division multiplexed wireless data communication systems is characterized in that the data subscriber interface unit transmits the transmission data, a control line signal indicating the transmission request, and the wireless time slot allocation request. A multiplexing circuit for multiplexing a time slot on the baseband frame corresponding to the wireless time slot, and receiving data, a control line signal, and allocation / release information of the wireless time slot from the basebanded time slot. A configuration including a signal separation circuit for separation can be employed.

A data communication method in a multi-way time division multiplexed wireless data communication system according to the present invention comprises a base station apparatus, a plurality of subscriber station apparatuses, and first and second data terminal apparatuses connected thereto. Data communication is possible between a first data terminal connected to the base station and a second data terminal connected to the subscriber station opposite to the first terminal. In a data communication method in a multi-way time division multiplexed wireless data communication system, a TDMA is transmitted from the subscriber station to the base station.
Data communication is performed by the system, the data communication is performed from the base station side to the subscriber station device side by the TDM method, and the data terminal device needing the data communication is requested by one of the wireless time slot requests, A time slot management circuit in the base station device allocates a wireless time slot for the data communication, and when confirming the end of the data communication, the time slot management circuit releases the wireless time slot.

[0020] In the data communication method in the multi-way time division multiplexing wireless data communication system, a first data subscriber interface section is provided between the base station apparatus and the first data terminal apparatus connected thereto. And a second terminal connected to the second data terminal device within the subscriber station device.
When the data subscriber interface unit is connected to the data terminal device and the data terminal device makes a transmission request to the connected data subscriber interface unit, the data subscriber interface unit requests the time slot management circuit to allocate a wireless time slot. The data subscriber interface unit having received the allocation of the wireless time slot from the time slot management circuit informs the data terminal device that has made the transmission request that transmission is possible, and the time slot management circuit The data subscriber interface unit, which has been assigned the above, notifies the data terminal apparatus of the presence of a data channel reception carrier,
A method in which data communication is started between the data terminal devices can be adopted.

[Operation] In the multi-way time division multiplexing wireless data communication system and the data communication method in this system according to the present invention, a wireless time slot is allocated only when data communication is performed, and the wireless time slot is allocated when data communication is not performed. The first feature is that the use efficiency can be improved by releasing the time slots. In FIG. 1, when the data subscriber interface unit 41 in the subscriber station apparatus 31 recognizes that there is transmission data in the data terminal apparatus 51, the data subscriber interface unit 41 requests the base station apparatus 8 to allocate a wireless time slot. Perform Then, the data subscriber interface unit 41 receives the wireless time slot information secured by the wireless time slot management circuit 9 in the base station device 8 and holds the wireless time slot information.
After the wireless time slot is determined, the data terminal 51
Is multiplexed by the data subscriber interface unit 41 in a time slot on a baseband frame corresponding to the wireless time slot. The received data received by the subscriber station device 31 from the base station device 8 is separated from the time slot converted into the baseband by the data subscriber interface unit 41 and transmitted to the data terminal device 51.

On the other hand, it is assumed that both the RTS (data transmission request) signal input from the data terminal device 51 and the DCD (data channel reception carrier) signal transmitted from the opposing data subscriber interface unit 11 disappear. Upon recognition, the data subscriber interface unit 41 sends a release request for the allocated wireless time slot to the base station device 8.

[0023]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a multi-way time division multiplexed wireless data communication system according to the present invention.

This configuration diagram is the same as the configuration diagram described in the section of the prior art, but will be described a little again for the description of the embodiment of the present invention. The base station device 8 includes a time slot management circuit 9 that manages resources of wireless time slots of the data communication system.
The data subscriber interface accommodating unit 10 is connected to the base station device 8, and includes the data subscriber interface units 11 to 1.
3 are accommodated. Data subscriber interface unit 11
To 13 are connected to data terminal devices (DTEs) 21 to 23, respectively. Also, the base station device 8 and each of the subscriber station devices 31 to 33 face each other via a wireless line (section). Each of the subscriber station devices 31 to 33 accommodates a data subscriber interface unit 41 to 43, respectively. Data terminal devices (DTE) 51 to 53 are connected to the data subscriber interface units 41 to 43, respectively. The down direction from the base station device 8 to the subscriber station devices 31 to 33 is TD.
In the M system, data communication is performed by the TDMA system in the upstream direction from the subscriber station devices 31 to 33 to the base station device 8. In the embodiment according to the present invention, a wireless time slot is not fixedly allocated between the data terminal devices 21 to 23 and the data terminal devices 51 to 53 for data communication.
This will be described later in detail.

FIG. 2 is a block diagram of a data subscriber interface unit used in one embodiment of the present invention. FIG.
Have data subscriber interface units 41, 42 and 4
Although 3 is shown, these are all the same configuration, so that the data subscriber interface unit 41 will be described as a representative for convenience of explanation. As the interface between the data subscriber interface unit 41 and the data terminal device 51, standards RS-232 and RS-449 are generally adopted.

First, the data subscriber interface unit 4
The configuration and function (operation) of the first transmission side device will be described. The need for data communication arises, that is, the transmission data (S
D signal or SD) from the data terminal device 51,
First, a transmission request signal (ON or RTS of an RTS signal), which is one of the control line signals, is sent to the control line signal detection circuit 1 of the data subscriber interface unit 41 to notify it. In the control line signal detection circuit 1, the data terminal device 51
When it is detected that the transmission request signal has been turned ON (ON means presence or activation), the detection result (RTS signal ON) is transmitted to the time slot request circuit 2. In the time slot request circuit 2, the RTS signal is turned on.
Upon receiving the message, it generates a message (a message signal, that is, a time slot allocation request signal) for requesting the base station apparatus 8 to allocate a wireless time slot, and sends the message to the multiplexing circuit 4. The multiplexing circuit 4 multiplexes the message, which is a time slot allocation request signal, into an appropriate time slot on the frame. The data subscriber interface unit 41 and the data terminal device 51
Operate on digital baseband signals.

The multiplexed message signal is converted by the subscriber station apparatus 31 into a signal on a radio time slot of an appropriate carrier, and this radio time slot is sent to the base station apparatus 8 via a radio line. The transmission of the transmission data (CTS signal) including the allocation of the radio time slot from the base station apparatus 8 to the receiving apparatus of the data subscriber interface unit 41 through the subscriber station apparatus 31 in response to the transmission of the message signal. Will be returned. As a result, the opposing data terminal device 51 and data terminal device 2
1 can be transmitted (communicated).

The subscriber station device 3 that has become capable of data transmission
On the side 1, transmission data (SD), which is a continuous signal, is transmitted from the data terminal device 51 to the data subscriber interface unit 41.
To the continuous / burst signal conversion circuit 3. The continuous / burst signal conversion circuit 3 converts the transmission data into a burst signal and sends the burst signal to the multiplexing circuit 4. The multiplexing circuit 4 is a radio slot to which a burst signal output from the continuous / burst signal conversion circuit 3 and a control line signal (RTS) input from the data terminal device 51 and output from the control line signal detection circuit 1 are assigned. Are multiplexed into a time slot on a baseband frame corresponding to. The control line signal and the burst signal are often accommodated in one time slot as a pair,
When the signal amount of the burst signal is large, a plurality of time slots can be used.

The multiplexed time slots are converted by the subscriber station device 31 into radio time slots of an appropriate carrier. The wireless time slot is transmitted to the base station device 8 via a wireless line, and is converted by the base station device 8 into a time slot of a baseband signal. This time slot is stored in the data subscriber interface storage unit 1.
0 is sent to the data subscriber interface unit 11. The data subscriber interface unit 11 separates and reproduces the transmission data in the time slot, and sends the reproduced transmission data to the data terminal device 21 facing the data terminal device 51.

Next, the data subscriber interface unit 4
The configuration and function (operation) of one receiving device will be described. From the base station device 8 to the subscriber station device 3 via a wireless line
The wireless time slot similar to the above sent to 1 is converted by the subscriber station device 31 into a time slot of a baseband frame. This time slot corresponds to the allocated wireless time slot, and is input to the burst / continuous signal conversion circuit 5, setting information holding circuit 6, and control line signal separation circuit 7 of the data subscriber interface unit 41, respectively. A burst / continuous signal conversion circuit 5, a setting information holding circuit 6, and a control line signal separation circuit 7 separate the received data, time slot information, and control line signals from the time slots.

The burst / continuous signal conversion circuit 5 converts received data, which is a burst signal multiplexed in a time slot on a baseband frame, into continuous signal reception data (RD
Signal or RD), and outputs the received data to the data terminal device 51. The setting information holding circuit 6 separates and holds the time slot information transmitted as a message signal allocated or released by the time slot management circuit 9 of the base station apparatus 8, and converts the continuous / burst signal conversion circuit 3 And notifies the burst / continuous signal conversion circuit 5 of this time slot information (the value or position of the assigned wireless time slot). The control line signal separating circuit 7 includes a data subscriber interface 11
From the baseband frame, and separates the control line signal information from the data terminal device 51 as a data channel reception carrier detection signal (DCD signal or DCD).
Output to

The control line signal detection circuit 1 turns off both the RTS signal input from the data terminal device 51 and the DCD signal sent from the opposing data subscriber interface unit 11 (no OFF or no deactivation). Is detected, the OFF of the RTS signal is transmitted to the time slot request circuit 2 as a result of the detection, and the time slot request circuit 2 secures the base station 8 for transmitting the transmission data. The request for releasing the wireless time slot is executed in the same manner as in the case of the time slot allocation request.

FIG. 3 is a sequence chart of a multi-way time division multiplexed wireless data communication method according to one embodiment of the present invention. The control (operation) sequence of the data communication method in the multi-way time division multiplexed wireless data communication system described above with reference to FIGS. 1 and 2 will be described in further detail with reference to FIG. Here, for convenience of explanation, a case will be described in which data communication is performed upon transmission of the RTS signal ON from the data terminal device 51 connected to the subscriber station device 31.

Generally, the data terminal equipment (DTE) 51
When performing data transmission, first, the data line terminating device (D
CE), an ON of the RTS signal is transmitted, and when a transmission enable signal (CTS signal ON) is returned from the data line terminating device, transmission of a data signal (transmission data) is started. When the transmission of the data signal is completed, the RTS signal is turned off, and the CTS signal output from the data line terminating device is also turned off accordingly. When performing data reception, first, after receiving a data channel reception carrier detection signal (DCD signal ON) from the data line terminating device, reception of a data signal is started.

However, in the multi-way time division multiplexing wireless data communication system and method according to the present embodiment, the fact that the RTS signal input from the data terminal device 51 has been turned on indicates that the control line signal of the data subscriber interface unit 41 has been turned on. When the detection circuit 1 detects, the control line signal detection circuit 1 transmits the detection result to the time slot request circuit 2. Upon receiving the detection result of the ON of the RTS signal, the time slot request circuit 2 sends a message signal (that is, a time slot allocation request signal) requesting the time slot management circuit 9 in the base station device 8 to allocate a wireless time slot. It is generated and transmitted to a wireless line via the multiplexing circuit 4 and the subscriber station device 31. Time slot management circuit 9 in base station apparatus 8
Receives a time slot allocation request signal from the subscriber station device 31, allocates an appropriate wireless time slot,
Data subscriber interface unit 41 of subscriber station device 31
A wireless time slot (value: position) is allocated to the data subscriber interface unit 41 and the data subscriber interface unit 11 in the data subscriber interface accommodating unit 10 of the base station device 8 which faces the data subscriber interface unit 41 via a wireless line. Is transmitted.

In the data subscriber interface unit 41,
The setting information holding circuit 6 receives the time slot allocation information. The setting information holding circuit 6 holds the received time slot allocation information and notifies the continuous / burst signal conversion circuit 3 and the burst / continuous signal conversion circuit 5 of the position of the assigned wireless time slot. At this point, the data subscriber interface unit 41 of the subscriber station device 31 and the data subscriber interface unit 1 of the base station device 8
This means that a line has been set up with 1. A control line signal (RTS) is transmitted from the data subscriber interface unit 41 of the subscriber station device 31 to the data subscriber interface unit 11 of the base station device 8 through the set wireless time slot, and as a result, the data subscriber interface Part 1
1 outputs the ON of the DCD signal to the data terminal device 21. In addition, the data subscriber interface unit 41 of the subscriber station device 31 transmits a data transmission enable signal (OTS of the CTS signal).
N) is the data terminal device 51 which has inputted the ON of the RTS signal.
Return to. The data terminal device 51 that has received the ON of the CTS signal can transmit the data signal (transmission data), and the data terminal device 51 connected to the subscriber station device 31
Data communication is performed between the terminal and the data terminal device 21 connected to the base station device 8.

That is, the data signal transmitted from the data terminal unit 51 is multiplexed into the set time slot by the continuous / burst signal conversion circuit 3 of the data subscriber interface unit 41, and this time signal is transmitted by the subscriber station unit 31. It is converted to a wireless time slot corresponding to the slot. This wireless time slot is sent to the base station device 8 via a wireless line and converted into a baseband time slot. The data signal is separated from the time slot by the data subscriber interface unit 11 and sent to the data terminal 21. The data signal in the radio time slot received by the subscriber station apparatus 31 from the base station 8 via the radio line is separated from the time slot set by the burst / continuous signal conversion circuit 5 of the data subscriber interface unit 41. At the same time, it is converted into a continuous signal (RD) and transmitted to the data terminal device 51.

Next, the operation of the present embodiment in the case where the transmission data (SD) transmitted from the data terminal device 51 is lost and the data communication is terminated will be described.

When there is no more transmission data to be transmitted from the data terminal device 21 of the base station device 8, the data terminal device 21 transmits an RTS signal OFF to the data subscriber interface unit 11 through the set time slot. The data subscriber interface unit 11 having received the notification transmits the control line signal to the data subscriber interface unit 41 of the subscriber station device 31 by placing the control line signal on a baseband time slot and a radio time slot. . Then, the control line signal separation circuit 7 of the data subscriber interface unit 41 separates the control line signal from the baseband time slot, and outputs the DCD signal OFF to the control line signal detection circuit 1 and the data terminal device 51.

When there is no more transmission data to be transmitted from the data terminal device 51 of the subscriber station device 31, the data terminal device 51 sends an RTS signal to the control line signal detection circuit 1 of the data subscriber interface unit 41. Is sent off. The control line signal detection circuit 1, which has detected both the OFF of the DCD signal and the OFF of the RTS signal at the same time, notifies the detection result time slot request circuit 2 of the result. Then
The time slot request circuit 2 generates a message signal requesting release of a wireless time slot addressed to the time slot management circuit 9 in the base station device 8. This message signal is transmitted to the wireless line via the multiplexing circuit 4 and the subscriber station device 31, and is transmitted to the base station device 8.

When the time slot management circuit 9 in the base station apparatus 8 receives the time slot release request information (the message signal) from the subscriber station apparatus 31, the data subscriber interface section 41 of the subscriber station apparatus 31 and The time slot release information is transmitted to the data subscriber interface unit 41 and the data subscriber interface unit 11 of the opposing base station device 8 via the wireless line.
Upon receiving the time slot release information, the setting information holding circuit 6 of the data subscriber interface unit 41 receives the time slot release information and outputs the continuous / burst signal conversion circuit 3 and the burst / continuous signal conversion circuit 5.
Release the time slot assigned to the wireless communication, that is, the wireless time slot. At this point, the line between the data subscriber interface unit 41 of the subscriber station device 31 and the data subscriber interface unit 11 of the base station device 8 has been released.

When the line is released, the data subscriber interface section 11 of the base station apparatus 8 sends the DCD signal OFF to the data terminal apparatus 21. On the other hand, in the data subscriber interface unit 41 of the subscriber station device 31, when the line is released, the control line signal detection circuit 1
When the S signal is turned off (data transmission is disabled), the data terminal device 5
1 is output. Thus, the data communication between the data terminal device 51 and the data terminal device 21 facing each other ends.

The multi-way time-division multiplexing wireless data communication system and the data communication method in this system described in detail above according to the present embodiment are opposed to the data terminal device connected to the subscriber station device. A wireless time slot is allocated only when data transmission (data communication) is performed with a data terminal device connected to the base station apparatus 8, so that a fixed wireless time slot is fixed even when data transmission is not performed. There is the advantage that all the radio time slots can be used much more effectively than the occupied conventional communication system and method.

It should be noted that, in the above description of the embodiment, the specific opposing data terminal device 51 and data terminal device 21
Although only the data communication with the data terminal device 52 has been described, it is clear that the description can be applied to the data communication between the data terminal device 52 and the data terminal device 22 and between the data terminal device 53 and the data terminal device 23.

In the embodiment shown in FIG. 1, the number of subscriber station devices connected to one base station device 8 is three, and one data subscriber is connected to each of the subscriber station devices 31 to 33. Although the case where the interface unit is accommodated has been described, the present invention is not limited to the above embodiment, and the number of subscriber station devices is other than three, and a plurality of subscriber station devices may be provided. It is apparent that the same effect can be obtained also in the case where the data subscriber interface unit is accommodated by defining the opposing data terminal device.

Further, in the description of the embodiment, a case has been described where data communication is started when the RTS signal from the data terminal device is turned on, but the RTS signal from the data terminal device of the base station is turned on. When data communication is started at the opportunity, it is obvious that the same effect can be obtained by using the same configuration and the same procedure as those in FIGS.

In addition, in the description of the embodiments, it has been described on the assumption that the data terminal device is a DTE, but the data terminal device is connected to a data line terminal (DC).
Also in the case of changing to E), the data communication can be started when the DCD signal is sent from the data terminal device as an opportunity, and it is clear that the same effect as in the above embodiment can be obtained. .

For convenience of explanation, the base station device 8 and the subscriber station device of the multi-way time division multiplexing wireless data communication system require other important circuits such as a modulator and a demodulator. Circuits and signal lines which are not particularly important in the present invention are omitted.

[0049]

As described above, according to the present invention, the time slot management circuit in the base station apparatus is provided in the data terminal apparatus connected to the base station or the subscriber station in which the data communication is required. According to the wireless time slot request,
A wireless time slot for data communication is allocated, and when the end of the data communication is confirmed, the wireless time slot is released. Therefore, when no data transmission is performed, the wireless time slot is not fixedly occupied, and particularly, data is not transmitted. In a system in which a large number of communication subscribers are accommodated, there is a great effect that wireless time slots can be used very effectively.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a multi-way time division multiplexed wireless data communication system according to the present invention.

FIG. 2 is a block diagram of a data subscriber interface unit used in an embodiment of the present invention.

FIG. 3 is a sequence chart of a multi-way time division multiplexed wireless data communication method according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 control line signal detection circuit 2 time slot request circuit 3 continuous / burst signal conversion circuit 4 multiplex circuit 5 burst / continuous signal conversion circuit 6 setting information holding circuit 7 control line signal separation circuit 8 base station apparatus 9 time slot management circuit 10 data Subscriber interface accommodating sections 11, 12, 13 Data subscriber interface sections 21, 22, 23 Data terminal equipment (DTE) 31, 32, 33 Subscriber station apparatuses 41, 42, 43 Data subscriber interface sections 51, 52, 53 Data terminal equipment (DTE)

Claims (8)

[Claims] 1. A first data terminal having one base station device, a plurality of subscriber station devices, and first and second data terminal devices connected thereto, wherein the first data terminal is connected to the base station device. A multi-way time-division multiplexed wireless data communication system capable of data communication between a device and a second data terminal device connected to said subscriber station device facing said first terminal device; A data communication is performed from the device side to the base station side by the TDMA system, a data communication is performed from the base station side to the subscriber station side by the TDM system, and a time slot management circuit in the base station device includes: A wireless time slot for the data communication is allocated according to a wireless time slot request of any of the data terminal devices in which the need for the data communication has occurred, and when the end of the data communication is confirmed, the wireless A multi-way time division multiplexed wireless data communication system characterized by releasing a time slot. 2. A first data subscriber interface unit is connected between the base station device and the first data terminal device connected to the base station device. A second data subscriber interface unit connected to a second data terminal device is connected, and when the data terminal device makes a transmission request to the connected data subscriber interface unit, the data subscriber interface unit 2. The multi-way time-division multiplexed wireless data communication system according to claim 1, wherein the unit makes a request for allocating a wireless time slot to the time slot management circuit. 3. The data subscriber interface unit to which the wireless time slot is allocated from the time slot management circuit informs the data terminal device that has made the transmission request that transmission is possible, and the time slot management circuit transmits the wireless time slot to the data terminal device. The data communication between the data terminal devices is started when the data subscriber interface unit to which the time slot is allocated notifies the data terminal device of the presence of a data channel reception carrier. 3. The multi-way time division multiplexed wireless data communication system according to 2. 4. When each of the opposing data terminal devices notifies the connected data subscriber interface unit that transmission of the transmission data has been completed, the notified data subscriber interface unit transmits the transmission data. 3. The multi-way time division multiplexed wireless data communication system according to claim 2, wherein a request to release said wireless time slot used for transmission is sent to said time slot management circuit. 5. The data subscriber interface unit which receives the release information of the wireless time slot from the time slot management circuit and informs the transmission permission to the data terminal device which has issued the transmission request, informs the data terminal device which has requested the transmission, The data subscriber interface unit receiving the wireless time slot release information from the slot management circuit notifies the data terminal device that there is no data channel reception carrier, so that data communication between the data terminal devices is stopped. The multi-way time division multiplexed wireless data communication system according to claim 4, wherein: 6. The data subscriber interface unit,
A multiplexing circuit that multiplexes the transmission data, the control line signal indicating the transmission request, and the radio time slot allocation request into a time slot on the baseband frame corresponding to the radio time slot; 5. A signal separation circuit for separating received data, a control line signal, and allocation / release information of the radio time slot from each of the time slots.
Or the multi-way time-division multiplexed wireless data communication system according to 5. 7. A first data terminal having one base station device, a plurality of subscriber station devices, and first and second data terminal devices connected thereto, wherein the first data terminal is connected to the base station device. A data communication method in a multidirectional time-division multiplexed wireless data communication system capable of performing data communication between a device and a second data terminal device connected to the subscriber station device facing the first terminal device, Data communication is performed from the subscriber station device side to the base station by the TDMA method, data communication is performed from the base station side to the subscriber station device by the TDM method, and the necessity of the data communication arises. A time slot management circuit in the base station device allocates a wireless time slot for the data communication in response to any of the wireless time slot requests of the data terminal device, Data communication method in a multi-way time division multiplex radio communication systems the time slot management circuit and to check which is characterized in that opening the radio timeslots completion. 8. A first data subscriber interface section is connected between the base station apparatus and the first data terminal apparatus connected thereto, and the second data subscriber interface section is provided in the subscriber station apparatus. When a second data subscriber interface unit connected to the data terminal device is connected and a transmission request is made to the data subscriber interface unit to which the data terminal device is connected, the data subscriber interface unit transmits the time. A wireless time slot allocation request is sent to a slot management circuit, and the data subscriber interface unit, which has received the wireless time slot allocation from the time slot management circuit, notifies the data terminal device that has made the transmission request that transmission is possible, The data subscriber interface unit, which has been allocated the wireless time slot from the time slot management circuit, The data communication in the multi-way time division multiplexed wireless data communication system according to claim 7, wherein data communication is started between the data terminal devices by notifying the data terminal device of the presence of the data channel reception carrier. Communication method.