JP2001203628A - Multi-place communication method and multi-place communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a multi-place communication method by which no collision takes place among data sent by respective stations when the data are sent between a base station and a plurality of terminal stations while using one radio frequency. SOLUTION: Data entered by an entry section of a terminal station and sent to a base station are stored once in a memory, and when terminal stations are in a calling inhibit state by a calling inhibit signal sent from the base station, the base station transmits data for all the terminal stations, each terminal station receiving the data transmits the data, to be sent to the base station, to the base station for a set time division processing time or when the terminal stations are in a calling inhibit release state by a calling inhibit release signal sent by the base station, each terminal transmits the data, which are stored in the memory and to be sent to the base station, to the base station for the set time division processing time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multipoint communication method and system for wirelessly transmitting data between a base station and a plurality of terminal stations.

[0002]

2. Description of the Related Art Conventionally, data transmission and transmission / reception control between a base station and a terminal station are performed using two frequencies or two channels, or a base station transmits a call prohibition signal. Later, data was transmitted to the first terminal station, a response signal from the first terminal station was confirmed, and then the data was sequentially transmitted to the second terminal station.

[0003]

The conventional transmission method requires twice the number of radios or the number of channels because of the above-described method, and completes data transmission from the base station to all terminal stations. There was a problem that it took time.

[0004] The present invention has been made to solve such a problem, and a terminal station that transmits a signal for prohibiting a call from a terminal station on the base station side and receives the prohibition signal from the base station is called a terminal station. Prohibit calling, then transmit data for all terminal stations from the base station at once, and after receiving data from the base station, the terminal station transmits a response signal and data by time-division processing assigned for a fixed time. When the base station receives a response signal from all the terminal stations and then transmits a signal for releasing the call from the terminal station, the terminal station receiving the release signal from the base station releases the call and allocates for a fixed time. It is an object of the present invention to obtain a multipoint communication method in which data is transmitted by division processing and data of a base station and transmission data of a plurality of terminal stations do not collide.

[0005]

According to a multi-point communication method according to the present invention, a base station includes a memory for storing data for a terminal station performing transmission, and transmits data to the terminal station before transmitting data from the base station. A calling prohibition signal for prohibiting calling is transmitted to prohibit calling of all terminal stations, and the data stored in the above memory is transmitted to all terminal stations at once. The data addressed to the station is taken out, stored in a memory, and a response signal notifying that the data has been correctly received is transmitted by performing a time-division process at a preset allocation time, and the terminal station stores data to be transmitted to the base station. When the transmission data to be transmitted to the base station is stored in the memory, the transmission data is transmitted following the response signal. After receiving the response signal from all the terminal stations, the base station transmits a call release signal that permits the call from the terminal station,
The terminal station reads out the transmission data if the transmission data to be transmitted to the base station after receiving the call release signal is stored in the memory, performs time division processing with a preset allocation time, and transmits the transmission data. Thereby, it is possible to prevent collision of signals between the base station and a plurality of terminal stations.

A multipoint communication system according to the present invention is a multipoint communication system for wirelessly transmitting data between a base station and a plurality of terminal stations. A terminal station transmission data memory storing an identification number and the plurality of terminal station identification numbers, and before transmitting the terminal station transmission data stored in the memory to the terminal station, the terminal station is in a call prohibited state. A base station having means for packetizing and transmitting data for all terminal stations stored in the first memory, and storing data to be transmitted to the base station. A base station transmission data memory, read data matching the data from the base station transmission data memory after receiving the transmission data from the base station, and assign a predetermined allocation following the response signal. A plurality of terminal stations having means for performing time-division processing and transmitting between the terminal stations, and when the base station receives response signals from all the terminal stations, the base station cancels the calling prohibited state of the terminal stations. Means for transmitting a call release signal, the terminal station releases the call inhibition state by the call release signal, reads data matching the received data from the base station transmission data memory, Means for transmitting data by performing time-division processing at a preset allocation time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing Embodiment 1 of the present invention. FIG. 1A is a block diagram of a base station, FIG. 1B is a block diagram of a terminal station,
FIG. 2 is a time chart showing the first embodiment of the present invention. In the figure, 11 and 31 are antennas, 12 and 32 are transmission / reception switches, 13 and 33 are reception units, 14 and 34 are decoder units, and 15 and 35. Is a control unit, 16, 18, 36, and 38 are memories, 17, 37 are display units, 19 and 39 are input units,
0 is a selection circuit, 21 and 41 are transmission units, 42 is a time division control unit, 51 is a call prohibition signal, 52 and 55 are base identification numbers,
53 and 56 are terminal identification signals, 54 is first data, 57
Is a response signal, 58 is a second data, 59 is a call release signal, T1 is a terminal calling prohibition period, T2 is a time division processing transition period, T3 is a first time division processing period, and T4 is a second time. This is a division processing period.

Next, the operation of the first embodiment will be described with reference to FIGS.
This will be described with reference to FIG. Here, a description will be given assuming that the base station communicates with three terminal stations from the terminal station 1 to the terminal station 3. In the multipoint communication method configured as described above, when data is transmitted from the base station to each terminal station, in order to prevent a collision between a signal from the base station and a signal caused by the calling of the terminal station. The control unit 15 outputs a call prohibition signal 51 to the transmission unit 21 before transmitting data to be transmitted to each terminal station stored in the memory 18. The transmission unit 21 transmits a call prohibition signal 51 modulated to a transmission frequency to the transmission / reception switch 12.
Is transmitted from the antenna 11 via the. Note that the call prohibition signal 51 does not include the base identification number 52 and the terminal identification number 53, and can be received simultaneously by all terminal stations.

After transmitting the call prohibition signal 51, the control unit 15 reads out the data to be transmitted to the transmission destination terminal station from the memory 18 via the selection circuit 20, and transmits the data to the terminal station 1 which transmits the data following the base identification number 52. Terminal identification number 53 and first data 5
4 into a packet, and then the terminal identification number 53 of the terminal station 2
And the first data 54 are packetized. Finally, the terminal identification number 53 of the terminal station 3 and the first data 54 are packetized and output to the transmitting unit 21. The data modulated to the transmission frequency by the transmitting unit 21 is transmitted and received by the transmission / reception switch. The signal is transmitted from the antenna 11 through the antenna 12.

Each terminal station receives and demodulates a signal from a base station via an antenna 31 and a transmission / reception switch 32 at a receiving section 33, and a decoding section 34 sets a call inhibiting signal 51, a base identification number 52, Terminal identification number 53 addressed to the terminal, first data 5
4. Identify whether it is a response signal 57 or a call release signal 59, and send the result to the control unit 35. When the control unit 35 receives the call prohibition signal 51, it sets the terminal call prohibition state, and prohibits data transmission from the terminal station during the terminal call prohibition period T1 until the call release signal 59 is received from the base station. I do.

When the control unit 35 receives the base identification number 52 and the terminal identification number 53 addressed to the own terminal, the control unit 35 stores the subsequent first data 54 addressed to the own terminal in the memory 36, and then checks whether there is an error in the received data. If the detection is normal and displayed on the display unit 37, the response signal 57 is packetized into the base identification number 55 and the terminal identification number 56. At this time, the second data 58 to be transmitted to the base station is set from the input unit 39. If the data is input and stored in the memory 38, the second data 58 is read from the memory 38 and packetized following the response signal 57, and the time division shift period T2 has elapsed since the transmission from the base station to all the terminal stations has been completed. The first time-division processing period T3, which is set in advance, is controlled later, and during the transmission period of the own terminal, data is output to the transmission unit 41 via the time-division control unit 42 and the transmission frequency is set. Transmitted to the base station from the antenna 31 via the the regulating duplexer 32. If there is an error in the received data, the response signal 57 is not transmitted to the base station.

The base station transmits a signal from the terminal station to the antenna 1
1. The signal is received and demodulated by the receiving unit 13 via the transmission / reception switch 12, and the base unit identification number 55 and the terminal identification number 5 are decoded by the decoder unit 14.
6. Identify whether the response signal 57 is the second data 58 addressed to the base station, and send the result to the control unit 15. The control unit 15 receives the base identification number 55 and the terminal identification number 56 and, when receiving the subsequent response signal 57, receives the first data 5 from the base station.
4 displays on the display unit 17 that transmission to the terminal station was successful. When the second data 58 from the terminal station is received following the response signal 57, the data is stored in the memory 16 and then the received data is detected for an error. If the data is normal, the data is displayed on the display unit 17 and A terminal that transmits a response signal 57 in a time-division manner in a time-division process, and transmits a second data 58 to the terminal station that transmitted the second data 58 after the time when all terminal stations complete transmission, following the base identification number 52 The terminal identification number 53 of the station and the response signal 57 are packetized and output to the transmission unit 21, and the data modulated to the transmission frequency by the transmission unit 21 is transmitted from the antenna 11 via the transmission / reception switch 12. When the base station cannot receive the response signal 57 from the terminal station within a predetermined time, that is, when the first data 5
When an error is detected in the terminal station No. 4, the terminal station again transmits the first message.
Is transmitted. If there is an error in the received data, the response signal 57 is not transmitted to the terminal station.

Each terminal station receives and demodulates a signal from a base station via an antenna 31 and a transmission / reception switch 32 at a receiving unit 33, and a decoder unit 34 provides a base identification number 52 and a terminal identification number addressed to the terminal itself. 53, identifying whether it is a response signal 57, and sending the result to the control unit 35; The control unit 35 outputs a response signal 57
Is received, the display unit 37 displays that the second data 58 from the terminal station has been correctly transmitted to the base station. When the terminal station cannot receive the response signal 57 from the base station within a predetermined time, that is, when an error is detected in the second data 58 received by the base station, the terminal station performs the following second time division processing period T4. The second information 5 to the base station again
Send 8.

When data has been transmitted from the base station to all terminal stations, the control unit 15 sends a call release signal 59 to the transmission unit 21.
Is output and transmitted from the antenna 11 in the same manner. Note that the call release signal 59 is also data that does not include the base identification number 52 and the terminal identification number 53, like the call inhibition signal 51.

Each terminal station receives the signal from the base station in the same manner as described above, and the decoder unit 34 identifies whether or not it is the call release signal 59, and sends the result to the control unit 35. Upon receiving the call release signal 59, the control unit 35 releases the terminal call prohibition state to enable transmission from the terminal station, and sets a second time division processing period T4 set in advance after the time division processing transition time T2 has elapsed. Control.

The second data transmitted from the terminal station to the base station
Is set and input from the input unit 39 and stored in the memory 38. When the data is stored in the memory 38, the control unit 35 of the terminal station that has released the terminal call prohibition state transmits the data via the time division control unit 42 when the second time division processing period T4 is the period of the own terminal. The second data 58 is read out from the base identification number 55, the terminal identification number 56, and the memory 38, packetized, output to the transmission unit 41, and transmitted from the antenna 31.

The base station transmits a signal from the terminal station to an antenna 1
1. The signal is received and demodulated by the receiving unit 13 via the transmission / reception switch 12, and the base unit identification number 55 and the terminal identification number 5 are decoded by the decoder unit 14.
6. Identify whether the data is the second data 58 addressed to the base station and send the result to the control unit 15. The control unit 15 has the base identification number 5
5. When the terminal identification number 56 is received and the second data 58 from the subsequent terminal station is received, the data is stored in the memory 16 and then the received data is detected for errors. And the terminal identification number 53 and the response signal 57 of the terminal station to be transmitted to the terminal station following the base identification number 52 are packetized and output to the transmission unit 21, and the data modulated to the transmission frequency by the transmission unit 21. Is transmitted from the antenna 11 via the transmission / reception switch 12.

Each terminal station receives and demodulates a signal from the base station via an antenna 31 and a transmission / reception switch 32 by a receiving section 33, and a base station identification number 52 and a terminal identification number addressed to its own terminal by a decoder section 34. 53, identifying whether it is a response signal 57, and sending the result to the control unit 35; The control unit 35 outputs a response signal 57
Is received, the display unit 37 displays that the second data 58 from the terminal station has been correctly transmitted to the base station. When transmitting data to the base station after releasing the call from the terminal station, if the response signal 57 from the base station cannot be received within a predetermined time, that is, the second data 58 received by the base station
When an error is detected in the base station,
When the time division processing period T4 is the period of the own terminal, the base identification number 55 and the terminal identification number 5 are transmitted via the time division control unit 42.
6 and the second data 58 are read out from the memory 38, packetized, output to the transmitting unit 41, and transmitted again from the antenna 31.

Each terminal station repeats the above operation until the next call transmission signal 51 is transmitted from the base station, and transmits sequentially input data to the base station by time division processing.

[0020]

According to the present invention, the data of the base station and the data of the terminal station do not collide using one frequency of the radio, and the data of the terminal station do not collide with the data of the terminal station. It can be transmitted quickly and reliably.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a multipoint communication method according to the present invention.
FIG.

FIG. 2 is a diagram showing a time chart of the implementation of the multi-point communication method according to the present invention.

[Explanation of symbols]

11 antenna, 12 duplexer, 13 receiver, 1
4 decoder unit, 15 control unit, 16 memory, 17 display unit, 18 memory, 19 input unit, 20 selection circuit, 2
1 transmitting unit, 31 antenna, 32 transmission / reception switch, 33
Receiving section, 34 decoder section, 35 control section, 36 memory, 37, display section, 38 memory, 39 input section, 4
1 transmission unit, 42 time division control unit, 51 call prohibition signal, 52 base identification number, 53 terminal identification number, 54
First data, 55 base identification number, 56 terminal identification number, 57 response signal, 58 second data, 59 call release signal, T1 terminal call inhibition period, T2 time division processing transition period, T3 first time Division processing period, T4 Second time division processing period.

Claims (2)

[Claims] 1. A method for transmitting data between a base station and a plurality of terminal stations using radio, wherein the base station includes a memory for storing transmission data for the transmitting terminal station and a reception signal from the terminal station. It has a memory for storing data, transmits a call prohibition signal before transmitting data, and sets the terminal station that has received the call prohibition signal from the base station to a call prohibition state, and the base station is stored in the memory. The transmission data to be sent to the first terminal station is read and transmitted, and then the transmission data stored in the memory is similarly transmitted from the second to the last terminal station to the terminal station. And a memory for storing transmission data to be transmitted to the base station, extracting data addressed to the own station from the received data and storing it in the above memory to notify that the data from the base station has been correctly received. When a response signal is time-division-processed for a preset allocation time and transmitted, and data is received, if data to be transmitted to the base station is stored in the memory, the transmission data is read from the memory following the response signal. The base station transmits a response signal indicating that the data received from the terminal station is correctly stored in the above memory if there is received data following the response signal from the terminal station, if any, following the response signal from the terminal station. Transmitting a call release signal for releasing the call from the terminal station after receiving the response signal of
The terminal station releases the call prohibition state after receiving the call release signal and, if the data to be transmitted to the base station is stored in the memory, reads out the transmission data from the memory and performs time division processing with a preset allocation time. And transmitting data by using a single frequency between the base station and the plurality of terminal stations. 2. A multi-point communication system for wirelessly transmitting data between a base station and a plurality of terminal stations, terminal station transmission data to be transmitted to the plurality of terminal stations, a base station identification number, and the plurality of terminal stations. A terminal station transmission data memory that stores an identification number, and transmits a call prohibition signal that places the terminal station in a call prohibition state before transmitting the terminal station transmission data stored in the memory to the terminal station. And a base station having means for packetizing and transmitting data for all terminal stations stored in the first memory, and a base station transmission data memory storing data to be transmitted to the base station. Means for reading out data corresponding to the data from the base station transmission data memory after receiving the transmission data from the base station, and performing time division processing for a predetermined assigned time following the response signal and transmitting the data. And a plurality of terminal stations having, and the base station further comprises means for transmitting a call release signal for releasing the call prohibition state of the terminal stations when receiving response signals from all terminal stations. Further, the terminal station releases the call prohibition state by the call release signal, reads data matching the received data from the base station transmission data memory, and stores the data at a preset allocation time. Means for performing a division process and transmitting the divided data.