JPH11122159A - Radio digital communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize efficient radio data communication by relieving troublesome connection control and improving immediacy in the case of communication between a base station and plural terminal stations through a time division multiplex radio channel, especially in the case of communication by the plural terminal stations. SOLUTION: A base station 1 provided with an assignment means 1a assigns the same speech channel in different unit multiplexed times in a time division multiplex radio channel to plural terminal stations 3 whose communication is requested by a terminal station 2 in response to a group communication connection request (A) designating the plural terminal stations 3 from the terminal station 2 and informs the terminal station 2 making the connection request of contents of the assignment. The terminal station 2 provided with a data collection means 2a receives the information of the contents of the assignment and uses the assigned speech channel to execute communication sequentially with each terminal station 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio digital communication system in which a base station and a plurality of terminal stations communicate via a time division multiplex radio line. In the wireless digital communication system, a plurality of communication paths (referred to as slots and channels) are formed on one wireless carrier and multiplexed (time division multiplexing:
TDMA) and realizes connection control of the wireless communication channel by transmitting and receiving a digitized connection control code between the terminal station and the base station. This is a method that can flexibly meet various needs of communication demand because information of data communication can be efficiently carried, and also enables effective use of frequency and expansion of the number of subscribers. For example, in recent years, the demand for PDC (Personal Digital Cellule) has been remarkably increasing.
r), a portable telephone system found in a PHS (Personal Handyphone System), that is, a digital mobile radio system is also realized by combining such wireless digital communication technologies.

[0002]

2. Description of the Related Art An outline of a conventional wireless digital communication system will be described below with reference to FIG. For example, as shown in FIG. 13A, a TDMA frame (time-division multiplexed radio channel) is used for transmitting a downlink carrier (1) used for transmission from a base station to a terminal station and for transmitting a signal from the terminal station to the base station. Each of the uplink carriers (2) is used, and the number of multiplexed slots is n (n = 4 in the illustrated example). For example, terminal station Y assigned slot 3
It receives data from the base station at the timing of slot 3 of the downlink carrier (1) and transmits data to the base station at the timing of slot 3 of the uplink carrier (2). The time of the multiplex number n is a unit multiplex time.

[0003] A communication mode in the case where the terminal stations A and B, the terminal stations C and D, and the like communicate is as shown in FIG. That is, for example, the communication between the terminal stations A and B is:
This is realized by the terminal station A transmitting and receiving to and from the base station at the timing of slot 1 and the terminal B transmitting and receiving to and from the base station at the timing of slot 2. As described above, the conventional wireless digital communication system has a configuration in which connection can be made only at 1: 1.

[0004]

Then, when one terminal station communicates with a plurality of terminal stations, and conversely, when data generated at a plurality of terminal stations is transmitted to a specific terminal station or a base station, Conventionally, connection control has to be repeated a plurality of times, which is very complicated and inefficient. Also,
In public communication (PDC, PHS), for example, FIG.
As shown in (1), data and messages are registered in a data bank 130 such as a base station from a certain terminal station A (), and the registered messages and the like are transferred to a plurality of other terminal stations B, C,.
n is referred to, the terminal station B, C,..., n has a configuration in which each of the terminal stations B, C,.
Even if the terminal requests immediacy, a time difference is required before the inquiry is completed, depending on the operation of the other terminal station.

SUMMARY OF THE INVENTION The present invention provides a wireless digital communication system capable of realizing an efficient wireless data communication by releasing the complexity of connection control when a plurality of terminal stations communicate and improving the immediacy thereof. It is to provide a method.

[0006]

FIG. 1 is a block diagram showing the principle of the first aspect of the present invention. According to a first aspect of the present invention, in a wireless digital communication system in which a base station and a plurality of terminal stations communicate via a time division multiplexed radio channel, the base station 1 designates a plurality of terminal stations from the terminal station 2. In response to the group communication connection request (a), the terminal station 2 sends a plurality of terminal stations 3 requesting communication to the same communication channel within different unit multiplex times on the time division multiplex radio line. And assigning means 1a for notifying the terminal station 2 that has issued the connection request (a) of the assignment contents. The terminal station 2 receives the notice of the assignment contents and uses the assigned communication channel. And each terminal station 3
And a data collection means 2a for sequentially performing communication.

That is, according to the first aspect of the present invention, a terminal station 2 that needs to transmit data to a plurality of terminal stations in a group communicates with a base station 1 in a group communication in which a plurality of terminal stations 3 are designated. Of the connection request (a). Then, in the base station 1, the allocating means 1a allocates the same communication channel in different unit multiplex times on the time-division multiplex radio line to the plurality of terminal stations 3 to which the terminal station 2 has made a communication request. Along with (b), the terminal station 2 that has issued the connection request (a) is notified of the assignment contents (c).

As a result, each of the plurality of terminal stations 3 having received the assignment (b) shifts to the transmission / reception state on the same communication channel within the designated unit multiplex time, and thus receives the notification (c) of the assignment contents. In the terminal station 2, the data collection means 2a can sequentially perform communication with each terminal station 3 using the allocated communication channel (d). Thus, data communication (group communication) with a plurality of terminal stations can be performed continuously without performing a connection control procedure with each base station.

FIG. 2 is a block diagram showing the principle of the second aspect of the present invention. According to a second aspect of the present invention, in a wireless digital communication system in which a base station and a plurality of terminal stations communicate via a time division multiplexed wireless channel, the base station 4 responds to an external connection request for simultaneous communication. Allocating means 1a for allocating the same communication channel within the same unit multiplex time on a time-division multiplex radio line to a plurality of terminal stations, and a simultaneous communication request for performing a simultaneous communication request to the plurality of terminal stations to the plurality of terminal stations. Means 4b and simultaneous data transmitting means 4 for simultaneously transmitting data to a plurality of terminal stations using the assigned communication channel.
7c.

In other words, according to the second aspect of the present invention, when simultaneous data transmission is required on the base station side, a connection request for requesting simultaneous communication from outside, such as an operation unit or a data terminal connected to the base station, is provided. Enter. Then, in the base station 4, the allocating means 1a allocates the same communication channel within the same unit multiplex time on the time-division multiplexed radio channel to the plurality of terminal stations, and the simultaneous communication requesting means 4b
Sends a communication request to a plurality of terminal stations to indicate that the communication is simultaneous communication, and the simultaneous data transmitting means 4c simultaneously transmits data to the plurality of terminal stations using the assigned communication channel.

[0011] Each of the plurality of terminal stations receives the notification of the simultaneous communication and shifts to the reception mode using the same communication channel within the same unit multiplex time on the allocated time division multiplex radio line. Can be reliably received. FIG. 3 is a principle block diagram of the third aspect of the present invention. According to a third aspect of the present invention, there is provided a wireless digital communication system in which a base station and a plurality of terminal stations are connected via a time division multiplex radio line.
Means for allocating the same communication channel within the same unit multiplex time on a time-division multiplex radio line to a plurality of terminal stations in response to a connection request for random communication from outside
a, a random communication requesting means 5b for making a communication request that random communication is possible to a plurality of terminal stations, and transmitting a line busy signal to other terminal stations in response to a communication request from the terminal station. And a line control means 5c for transmitting a line idle signal to another terminal station in response to the end of communication of the terminal station which has issued the communication request.

That is, according to the third aspect of the present invention, when it is desired to perform random communication with each terminal station on the base station side, random communication from the outside, such as an operation unit or a data terminal connected to the base station, is performed. Request a connection request to enter. Then, in the base station 5, the allocating means 1a allocates the same communication channel in the same unit multiplex time of the time division multiplex radio channel to the plurality of terminal stations, and the random communication requesting means 5b transmits the plurality of terminal stations to the plurality of terminal stations. A communication request that random communication is possible is made.

Next, when there is a communication request from a certain terminal station, the line control means 5c transmits a line busy signal to another terminal station other than the terminal station which has issued the communication request, Restrict transmission operation. As a result, the terminal station that has issued the communication request can smoothly perform data communication with the base station. Then, when the terminal station that has issued the communication request ends the communication, the terminal station receives a communication end notification from the terminal station, and the line control unit 5c transmits a line idle signal to the other terminal stations. As a result, the terminal station that has issued the transmission request while waiting can perform the transmission operation, and can perform data communication with the base station.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 4 and 5 show the configurations of the base station and the terminal station according to the first to third aspects of the present invention. The base station includes, as shown in FIG.
TDMA demultiplexer 11, radio receiver 12, communication request signal generator 13, radio carrier / slot allocator 14, connection request signal receiver 15, disconnection signal receiver 16, communication request signal receiver 17, end signal receiver 18, a simultaneous communication detection unit 19, a communication type identification unit 20, a connection request reception unit 21, a random communication detection unit 22, a disconnection detection unit 23, a busy / idle signal generation unit 24, and gate circuits 25 and 26.
The command device 27 is an operation unit operated by an operator in the base station or a data terminal connected to the base station.

The command device 27 and the wireless transmission unit 10 are connected by a data transmission path 28 with a gate circuit 25 interposed. Further, the command device 27 and the wireless receiving unit 12 are connected by a data receiving path 29 in which a gate circuit 26 is interposed. The command device 27 supplies one control output (connection request) to the connection request receiving unit 21 and supplies the other control output (disconnection) to the disconnection detection unit 23.

The connection request receiving unit 21 supplies one output (activation) to the wireless carrier / slot allocating unit 14 and the other output (communication type) to the communication type identifying unit 20. The communication type identification unit 20 provides one output (simultaneous) to the simultaneous communication detection unit 19 and the other output (random) to the random communication detection unit 21. The simultaneous communication detecting section 19 supplies one output to the gate circuits 25 and 26, and supplies the other output to the communication request signal generating section 13.

The random communication detector 21 supplies the first output to the communication request signal generator 13, the second output to the gate circuits 25 and 26, and the third output to the busy / idle signal generator 24. give. Outputs of the communication request signal generator 13, the busy / idle signal generator 24, and the wireless carrier / slot allocator 14 are provided to the wireless transmitter 10.

The radio transmission unit 10 includes a TDMA demultiplexing unit 11
Each input signal is multiplexed according to one of the outputs (multiplexed signal), converted to a radio high-frequency signal, and transmitted to a transmitting antenna. The radio receiving unit 12 converts the radio high-frequency signal received by the receiving antenna into an intermediate frequency signal, demodulates it,
The multiplexed signal is separated according to the other output (separated signal) of the demultiplexer 11, and the connection request signal receiver 15, the disconnection signal receiver 16, the communication request signal receiver 17, and the end signal receiver 1
8 and the data reception path 29.

The output (activation) of the connection request signal receiving section 15 is given to the wireless carrier / slot allocating section 14. The output (stop) of the disconnection signal receiving section 16 is provided to the wireless carrier / slot allocating section 14 together with the output (stop) of the disconnection detecting section 23. The outputs of the communication request signal receiving unit 17 and the end signal receiving unit 18 are provided to a busy / idle signal generating unit 24.

As shown in FIG. 5, the terminal station includes a radio transmission unit 30, an antenna duplexer 31, a radio reception unit 32, a connection request signal generation unit 33, a termination signal generation unit 34, a call response signal generation unit 35, a disconnection Signal generator 36, communication request signal generator 3
7, radio carrier / slot allocation detecting section 38, calling terminal response detecting section 39, communication request signal receiving section 40, end signal receiving detecting section 41, random signal detecting section 42, busy / idle signal detecting section 43, gate circuit 44, 45, a connection request detection unit 46, a terminal call setting unit 47, and the like. A data terminal 48 is connected to this terminal station.

The data terminal 48 and the radio transmission unit 30 are connected by a data transmission path 49 with a gate circuit 44 interposed. Further, the data terminal 48 and the wireless receiving unit 32 are connected by a data receiving path 50 in which a gate circuit 45 is interposed. The data terminal 48 provides one control output (connection request) to the connection request detection unit 46 and the other control output (communication request) to the terminal call setting unit 47.

The connection request detecting section 46 supplies one output (start) to the connection request signal generating section 33 and the other output (stop) to the end signal generating section 34. Terminal call setting unit 4
7 supplies a first output (communication type of 1: 1 communication or 1: n communication) to the connection request detection unit 46 and a second output (call number or the like) to the call response signal generation unit 35; The third output (communication end) is given to the disconnection signal generator 36, and the fourth output (communication request) is given to the communication request signal generator 37.

The radio transmission unit 30 outputs the data transmission path 49, the connection request signal generation unit 33, the end signal generation unit 34, the call response signal generation unit 35, the disconnection signal generation unit 36, and the communication request signal generation unit 37. The signal is converted into a radio high-frequency signal and transmitted to the antenna via the antenna sharing device 31.

The radio receiving section 32 receives the radio high-frequency signal received by the antenna via the antenna duplexer 31, converts it into an intermediate frequency signal, demodulates the signal, and transmits it to the radio carrier / slot allocation detecting section 38. Paging terminal response detection unit 39
And a communication request signal receiving section 40, an end signal receiving detecting section 41, a random signal detecting section 42, a busy / idle signal detecting section 73, and an output corresponding to each of the data receiving path 50.

The output (assigned slot) of the wireless carrier / slot assignment detecting section 38 is provided to a communication request signal generating section 37. The output (activation) of the calling terminal response detection unit 39 is given to gate circuits 44 and 45. Communication request signal receiving unit 4
0 gives one output (activation) to the gate circuits 44 and 45, and outputs the other output (communication request) to the call response signal generator 35.
Give to. The output of the end signal reception detector 41 is provided to gate circuits 44 and 45. The output (startup) of the random signal detector 42 and the two outputs (stop, start) of the busy / idle signal generator 43 are respectively connected to gate circuits 44 and 45.
Given to.

The correspondence between the above configuration and the claims is as follows. The allocating means 1a includes a wireless carrier
The slot assignment unit 14 mainly corresponds. The data collection means 2a mainly corresponds to the terminal call setting section 46 and the communication request signal generating section 36. The simultaneous communication request unit 4b mainly corresponds to the simultaneous communication detection unit 19 and the communication request signal generation unit 13.

The broadcast data transmitting means 4c mainly corresponds to the broadcast communication detecting section 18, the gate circuit 25, and the command device 27 as a whole. The random communication detecting unit 21 and the communication request signal generating unit 13 mainly correspond to the random communication request unit 5b. The busy / idle signal generator 23 mainly corresponds to the line controller 5c. Hereinafter, the operation of the embodiment corresponding to claims 1 to 3 will be described with reference to FIGS. This embodiment relates to multiple communication (group communication, simultaneous transmission, and random communication). Therefore, description of 1: 1 individual communication is omitted. The group communication is the communication mode of the embodiment according to claim 1, the simultaneous transmission is the communication mode of the embodiment according to claim 2, and the random communication is the communication mode of the embodiment according to claim 3.

FIG. 6 shows an example of radio carrier slot arrangement (4 multiplexing: CH1 allocation example). In the illustrated example, the wireless carriers are four of CH1 to CH4.
It is assumed that CH1 is allocated in the case of quadruple multiplexing composed of slots. The terminal transmission / reception timing of FIG. 6 (1), the transmission of (2), and the transmission / reception of (3) have been described above (FIG. 13), and therefore, the description thereof will not be repeated.

This wireless carrier slot allocation is performed by the wireless carrier / slot allocating section 14 by the connection request receiving section 21.
Alternatively, in response to a request from the connection request receiving unit 15, an empty slot is detected by a well-known procedure. In this embodiment, the same slot is allocated to all terminal stations to be communicated in a plurality of communications (group communication, simultaneous communication, and random communication) in this embodiment. Specifically, in the group communication, the same one slot in a different unit multiplex time is assigned to each terminal station. In the simultaneous communication and the random communication, the same one slot in the same unit multiplex time is allocated to each terminal station. In 1: 1 individual communication,
The fact that only two opposing terminal stations are targeted is the same as in the related art.

In the terminal station, the terminal call setting section 47 can designate either 1: 1 communication or 1: n communication. Therefore, slot allocation for 1: 1 individual communication and slot allocation for group communication are performed in response to a request from the terminal station, that is, upon receiving the output of the connection request signal receiving unit 15. FIG. 7 shows a wireless signal format. As shown in FIG. 7, a radio signal transmitted / received in each channel of the radio channel includes a control information section and a user information section. Various information elements are defined and set in the control information section, and user data for data communication is encoded and set in the user information section.

Of the information elements set in the control information section,
In particular, the information element according to this embodiment includes “communication identification”.
There are information elements of “calling terminal ID”, “signal type”, and “restriction”. The information element of “communication identification” is an identification code indicating one of individual communication for general communication, group communication for multiple communication, simultaneous communication, and random communication.
A terminal station sets an identification code for individual communication or group communication. The identification code for the simultaneous communication or the random communication is set by the base station.

The information element of "calling terminal ID" is an identification code indicating a calling number of an individual terminal or a plurality of terminals. The information element of the “signal type” includes a connection request (uplink) for receiving assignment from the base station, a wireless carrier slot assignment (downlink) for the base station to assign a wireless slot to each terminal station, A communication request (uplink) in which a terminal station requests terminal-to-terminal communication after allocating a wireless carrier slot to the station
Alternatively, the identification code indicates a communication request (downlink) from the base station to the terminal station, a response (downlink) of another terminal station, termination of communication (uplink), and disconnection (uplink) from the terminal station.

The information element of "restriction" is an identification code of each signal of busy (line busy signal) / idle (line free signal) for transmission restriction when the terminal station performs random access. FIG. 8 shows a communication link establishment / disconnection sequence. This sequence shows a case where a calling operation is performed at the terminal station A.

In the terminal station A, a call status report and a call setting request are transmitted to the base station via the control channel (1). Upon receiving the call setting request, the base station notifies the terminal station A of the fact (2) and notifies the receiving terminal station (B / n) of the communication mode (3). Thereafter, the base station performs synchronization setting (SB1) with each terminal station (4), performs radio channel setting and call setting (5), and requests each terminal station to activate a TCH (communication channel). In this procedure (5), slot allocation, communication type notification of individual communication or multiple communication, call setting, and the like of this embodiment are performed.

Thus, in each terminal station, the frequency is switched from the control channel to the communication channel. Then
The base station performs synchronization setting (SB1) with each terminal station (6).
At the same time, TCH is sent to each terminal station (7). Then
The state of radio wave propagation and the like is confirmed between the terminal station A and the base station, and the transmission terminal station A is instructed to switch the TCH signal (8).

The terminal station A transmits data to the receiving terminal station (B / n) (9), and when finished, notifies the base station of the release of the transmission right (10). Thereafter, the base station checks the state of radio wave propagation with another terminal station (B / n), and instructs the terminal station (B / n) to switch the signal of the TCH (11). As a result, the terminal station (B / n) becomes the terminal station A
Then, data transmission is performed to the base station (12). When the transmission is completed, the base station is notified of transmission right release (13).

The communication between the terminal stations is performed as described above, and the communication link is disconnected in response to the request from the terminal station A. That is, when receiving the disconnection request signal from the terminal station A (14), the base station notifies all the terminal stations of the disconnection of the wireless channel (15) and transmits an idle signal (idle signal) (16). . Thereby, the terminal station A and the terminal station B / n
The communication link between is disconnected.

(Group Communication) FIG. 9 shows a sequence of group communication. In this embodiment, a group communication for all terminal stations in the group is assumed, but it is naturally possible to selectively specify a part of the terminal stations. Here, the “group” is, for example, a home delivery vehicle group in the home delivery radio system, a fire truck group in the firefighting radio system,
It is a group of ambulances in the police radio system, and there are various types depending on the type of business.

FIG. 9A: Connection request detecting section 46 of terminal station A
Detects a connection request generated by the data terminal 48,
The connection request signal generator 33 is activated with reference to the output of the terminal call setting unit 47 (request for group communication). The connection request signal generation unit 33 generates a connection request signal in which “signal request” is set to “signal type” and “group communication” is set to “communication type” in the control information unit shown in FIG. Output to the transmission unit 30. Thereby, the connection request signal for the purpose of group communication is transmitted from terminal station A to the base station.

FIG. 9 (2): In the base station, the connection request signal receiving section 15 detects the connection request signal for the purpose of group communication demodulated by the radio receiving section 12 and sets the radio carrier / slot allocating section 14. to start. The radio carrier / slot allocating unit 14 sets “communication type” of the control information unit to “group communication”, sets “wireless carrier slot” allocated to “signal type”, and sets “grouping” to “calling terminal ID”. The call number of the corresponding terminal station is set and output to the wireless transmission unit 10. As a result, the base station broadcasts a “wireless carrier slot” to each terminal station in the group including the terminal station A in which the same slot is allocated within different unit multiplex times.

As a result, the terminal station A acquires the content of the slot assignment from the received 'wireless carrier slot'. On the other hand, each terminal station in the group specified by the “calling terminal ID” in the “wireless carrier slot” recognizes that the own station is a target station for group communication, and
The state shifts to the transmission / reception state in the same slot within the specified unit multiplex time, and communication with the terminal station A is performed at the timing shown in FIG. 10, for example.

FIG. 10 shows a communication mode when the second slot is allocated within four different unit multiplex times different from each other. The terminal station A is, for example, as shown in FIG.
As shown in (5), communication with each terminal station is performed in the order of terminal stations B, C,..., N.

FIG. 9 (3): In the terminal station A, the radio carrier
When the slot assignment detecting section 38 detects the assignment of the wireless carrier slot, the communication request signal generating section 37 is activated. On the other hand, when the transmission request is input from the data terminal, the terminal call setting unit 47 first sets the terminal station B as the terminal station to be called.
Is given to the communication request signal generator 37. Therefore, the communication request signal generating unit 37 sets “communication request” to “signal type” of the control information unit, and refers to the output (setting contents) of the calling terminal setting unit 47 to set “terminal station ID” to “terminal station”. A communication request signal in which B 'is set is generated, and the wireless transmission unit 29
Output to This communication request signal is transmitted to the terminal station B.

In the terminal station B, the communication request signal receiving section 40
Detects the communication request signal, the call response signal generator 3
5 is started. The call response signal generation unit 35 sets “response” to “signal type” in the control information unit, and sets the call terminal setting unit 4
7, a call response signal in which “terminal station B” is set as the “call terminal ID” with reference to the output (setting contents) is output to the wireless transmission unit 30. This call response signal is transmitted to terminal station A.

At the same time, in the terminal station B, when the communication request signal receiving section 40 detects the communication request signal, the gate circuit 4
4, 45 are opened (activated), and the data communication path (49, 50) between the wireless receiving unit 32 and the data terminal 48 is set to a conductive state, in preparation for data communication with the terminal station A. on the other hand,
In the terminal station A, when the call terminal response detection unit 39 detects the call response signal from the terminal station B, the gate circuits 44 and 45
Is established (activated), and the data communication path (49, 50) between the wireless receiving unit 32 and the data terminal 48 is set to a conductive state, thereby enabling the data transmission of the data terminal 48.

Thus, data communication between the terminal stations A and B is executed. Then, when the data terminal 47 of the terminal station A finishes the data transmission, the connection request detecting unit 46 notifies the end signal generating unit 34 of the communication end (stop). The end signal generating unit 34 is provided with a “signal type” in the control information unit.
Is set to “end”, and an end signal in which “terminal station B” is set to “calling terminal ID” is generated and output to the wireless transmission unit 30. This end signal is transmitted to the terminal station B.

Thereafter, in the same procedure, the terminal station A sequentially performs data communication with the terminal stations C,..., And the terminal station n, and executes data collection. FIG. 9 (6): In the terminal station A, the terminal call setting unit 47 monitors the end of the data communication with the terminal stations in the group, and when the end is detected, notifies the disconnection signal generating unit 35 of the communication end. . The disconnection signal generating unit 35 generates a disconnection signal in which “disconnection” is set in the “signal type” of the control information unit, and outputs the signal to the wireless transmission unit 30. Thereby, the disconnection signal is transmitted to the base station.

FIG. 9 (7): In the base station, the disconnection signal receiving unit 1
6 detects the disconnection signal, and gives a release (stop) command of the allocated slot to the wireless carrier / slot allocation unit 14. As a result, the assignment of the radio carrier slot from the base station to each terminal station is released, and information indicating the release is broadcast. (Simultaneous Data Transmission) FIG. 11 is a sequence of the simultaneous data communication.

FIG. 11A: The command device 27 of the base station, etc.
When data to be transmitted at the same time occurs, a connection request whose communication type is simultaneous communication is output to the connection request receiving unit 21. The connection request receiving unit 21 gives the input connection request to the communication type identification unit 20 and
Start 4 The wireless carrier / slot allocating unit 14
The "wireless carrier slot" assigned to the "signal type" of the control information section is set, and the "calling number of all terminal stations in the group" is set to the "calling terminal ID".
Output to As a result, the base station broadcasts a “wireless carrier slot” containing the same slot allocation within the same unit multiplex time to each terminal station in the group, and the same slot allocation is performed for each terminal station.

FIG. 11 (2): The communication type identification unit 20
When the communication type of the input connection request is identified as simultaneous communication, the communication request is notified to the simultaneous communication detection unit 19 and the communication request signal generation unit 13 is activated. The communication request signal generation unit 13 generates a communication request signal in which “communication request” is set in “signal type” of the control information unit, and “broadcast” is set in “communication type”, and is output to the wireless transmission unit 10. I do. As a result, a communication request to start simultaneous communication is broadcast from the base station to each terminal station, and each terminal station shifts to a receiving state in the same assigned slot.

FIG. 11 (3): Simultaneously, the simultaneous communication detecting section 19
Recognizes that it is a simultaneous communication, the gate circuit 25
Is established, and the data transmission path 28 between the command device 27 or the like and the wireless transmission unit 10 is set to a conductive state. This allows
Simultaneous transmission data of the command device 27 is simultaneously transmitted to each terminal station. FIG. 11D: The command device 27 outputs a disconnection signal to the disconnection detection unit 23 when the data transmission ends.

FIG. 11 (5): The disconnection detecting section 23 releases (stops) the slot allocated to the radio carrier / slot allocating section 14 in response to the disconnection signal. As a result, the assignment of the radio carrier slot from the base station to each terminal station is released, and information indicating the release is broadcast. (Random Communication) FIG. 12 shows a sequence of the random communication.

FIG. 12A: The command device 27 of the base station
When random communication of each terminal station is permitted, a connection request whose communication type is random communication is output to the connection request receiving unit 21. The connection request receiving unit 21 gives the input connection request to the communication type identification unit 20, and activates the wireless carrier / slot allocating unit 14. The wireless carrier / slot allocating unit 14 sets the “wireless carrier slot” assigned to the “signal type” of the control information unit, and sets the “calling terminal ID”
To 'call numbers of all terminal stations in the group'
Output to the wireless transmission unit 10. As a result, the base station broadcasts a “wireless carrier slot” containing the same slot allocation within the same unit multiplex time to each terminal station in the group, and the same slot allocation is performed for each terminal station.

FIG. 12 (2): The communication type identification unit 20
When the communication type of the input connection request is identified as random communication, information indicating that the communication type is random communication is provided to the random communication detection unit 21 and the communication request signal generation unit 13 is activated. The communication request signal generating unit 13 generates a communication request signal in which “communication request” is set in “signal type” of the control information unit and “random communication” is set in “communication type”, and outputs the generated signal to the wireless transmission unit 10. . Accordingly, the base station broadcasts a communication request for permitting random communication to each terminal station, and each terminal station shifts to a transmission / reception state in the same assigned slot.

At the same time, when the random communication detecting section 22 recognizes that the communication is a random communication, the gate circuits 25, 2
6 and the command device 27 and the wireless transmission / reception unit (10, 1
The data communication path (28, 29) to 2) is set to the conductive state. Thereby, random communication between the data terminal 48 of the terminal station and the command device 27 of the base station becomes possible.

When the random communication detecting section 22 recognizes that the communication is the random communication, the busy / idle signal generating section 24 causes the radio transmitting section 10 to output an idle signal. As a result, each terminal station can freely transmit. In the random communication in this embodiment, the transmission right is given to the terminal station that first receives the transmission request, the other terminal stations are given a busy signal to perform contention control, and the terminal station having the transmission right receives the transmission right. Is completed, an idle signal is given, and transmission of invitation to another terminal station, such as waiting for transmission, is repeated.

FIG. 12 (3): In each terminal station, when the random signal detecting section 41 recognizes the communication request from the base station to permit the random communication, the gate circuits 44 and 45 are opened (activated). It is prepared for data transmission of the data terminal 48 and data reception from the base station.

When data terminals 48 of some terminal stations generate transmission requests, in each terminal station, the connection request detection unit 46 detects the transmission request and activates the connection request signal generation unit 33, and the base station Outputs a transmission request to. FIG. 12 (4): In the illustrated example, the case where the base station first accepts the transmission request is the transmission request of terminal station A,
In the base station, when the communication request signal receiving unit 17 receives a communication request from one terminal station (A), the communication request signal
The idle signal generation unit 24 is activated, and a busy signal is given to the radio transmission unit 10 to transmit a busy signal to all terminal stations other than the terminal station A.

Thus, in all the terminal stations other than the terminal station A, the busy / idle signal detecting section 42 detects the busy signal, closes (stops) the gate circuits 44 and 45, and sets the data communication path (49, Since 50) is set to the non-conducting state, even if a transmission request is issued from those data terminals 47, the transmission operation cannot be performed. That is, the transmission right is given only to the terminal station A, and the other terminal stations are set in a state of waiting for a free line.

FIG. 12 (5): The terminal station A transmits and receives data to and from the base station. FIG. 12 (6): When the connection request detector 46 detects the end of data transmission, the terminal station A generates an end signal to the end signal generator 34 and directs the end signal from the wireless transmitter 30 to the base station. To send. FIG. 12 (7): In the base station, when the end signal receiving section 18 receives the end signal of the terminal station A, it activates the busy / idle signal generating section 24, gives an idle signal to the radio transmitting section 10, and outputs An idle signal is transmitted to all terminal stations other than A.

12 (8), (9) and (10): In this case, in each terminal station, the busy / idle signal detection section 43 detects an idle signal and opens (starts) the gate circuits 45 and 46. Each terminal station other than the terminal station A that has been in the transmission waiting state is in a state where transmission is freely possible, and data communication between each terminal station and the base station is performed in the same procedure as the procedure for acquiring the transmission right of the terminal station A. Performed separately for each.

FIG. 12 (11): In the base station, when the random communication with each terminal station is completed, the command device 27 outputs a disconnection signal to the disconnection detecting section 23. Disconnection detector 24
Receives the disconnection signal,
The slot allocated to No. 4 is released (stopped). As a result, the assignment of the radio carrier slot from the base station to each terminal station is released, and information indicating the release is broadcast.

This random communication can be applied, for example, when a certain terminal station registers with the base station and a plurality of other terminal stations inquire about it. Then, since the dependence on the operation can be reduced, a time delay between the registration operation and the inquiry operation can be eliminated.

[0064]

As described above, according to the first aspect of the present invention, a terminal station which needs to transmit data to a plurality of terminal stations in a group designates a plurality of terminal stations to the base station. When the base station transmits the connection request for the group communication, the base station allocates the same communication channel in different unit multiplex times on the time division multiplexed radio channel to the plurality of terminal stations requesting the communication, and Then, the terminal station that issued the connection request is notified of the assignment contents. Therefore, the terminal station that has issued the connection request performs communication with each terminal station in turn using the assigned communication channel without performing the connection control procedure one by one with the base station,
Data collection from a plurality of terminal stations can be performed continuously as a series of data collection processes.

According to the second aspect of the present invention, when simultaneous data transmission needs to be performed on the base station side, the base station responds to a plurality of terminal stations in response to an external connection request for simultaneous communication. The same communication channel within the same unit multiplex time on the division multiplex radio line is allocated, and a communication request for simultaneous communication is made to a plurality of terminal stations. As a result, each of the plurality of terminal stations shifts to the reception mode on the same assigned communication channel, so that the base station transmits data to the plurality of terminal stations simultaneously using the assigned communication channel. Thus, each terminal station can reliably receive broadcast data on the same communication channel.

According to the third aspect of the present invention, when it is desired that the base station performs communication with each terminal station, the base station transmits a plurality of terminals in response to an external connection request for random communication. The same communication channel within the same unit multiplex time on the time-division multiplex radio line is allocated to the stations, and a communication request is made to a plurality of terminal stations that random communication is possible, and there is a communication request from the terminal stations. And transmit a line busy signal to regulate the transmission operation of other terminal stations,
When the terminal station that has issued the communication request terminates the communication, it transmits a line idle signal and permits the terminal station that has been waiting and has issued the transmission request to perform the transmission operation.

Accordingly, the base station can ensure that only the terminal station that has issued the communication request can perform data communication with the base station by effectively using the line busy signal and the line idle signal. The contention control when the station randomly transmits data to the base station can be easily and reliably performed. In short, according to the present invention, in the case of multiple communication (group communication, simultaneous communication, random communication), the base station does not perform individual slot assignment for each terminal station, Within a different unit multiplex time on a time division multiplex radio line (for group communication)
Alternatively, since the same communication channel is allocated within the same unit multiplexing time (in the case of simultaneous communication and random communication), there is no need to repeat line connection control for each terminal station, which is sufficient for communication requiring immediacy. It can respond and perform efficient communication.

Also, since the carrier capacity of the radio line is fixed in the system, a hold time of a plurality of carriers is generated in connection processing of a plurality of communications, particularly in a time period when traffic is congested. According to this, since the same communication channel is used, the holding time of a plurality of carriers can be reduced, traffic can be alleviated, and the effective use of radio frequency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the invention according to claim 1;

FIG. 2 is a principle block diagram of the invention according to claim 2;

FIG. 3 is a principle block diagram of the invention according to claim 3;

FIG. 4 shows a configuration of a base station according to an embodiment corresponding to claims 1 to 3;

FIG. 5 is a configuration of a terminal station according to an embodiment corresponding to claims 1 to 3;

FIG. 6 shows an example of radio carrier slot arrangement (4 multiplex: CH
Example of one assignment).

FIG. 7 shows a wireless signal format.

FIG. 8 is a communication link establishment / disconnection sequence.

FIG. 9 is a sequence of a group communication.

FIG. 10 is a diagram showing a communication mode on an assigned slot (for example, a second slot).

FIG. 11 is a sequence of simultaneous data communication.

FIG. 12 is a sequence of a random communication.

FIG. 13 is a diagram illustrating an outline of a conventional wireless digital communication system.

[Explanation of symbols]

 1, 4, 5 Base station 1a Assigning means 2, 3 Terminal station 4b Simultaneous communication requesting means 4c Simultaneous data transmitting means 5b Requesting means 5c Line control means 10 Radio transmitting unit 11 TDMA demultiplexing unit 12 Radio receiving unit 13 Generation of communication request signal Unit 14 wireless carrier / slot allocating unit 15 connection request signal receiving unit 16 disconnection signal receiving unit 17 communication request signal receiving unit 18 end signal receiving unit 19 broadcast communication detecting unit 20 communication type identifying unit 21 connection request receiving unit 22 random communication detecting unit 23 Disconnection detection unit 24 Busy / idle signal generation unit 25, 26 Gate circuit 27 Command device, etc. 28 Data transmission path 29 Data reception path 30 Wireless transmission unit 31 Antenna duplexer 32 Wireless reception unit 33 Connection request signal generation unit 34 Termination signal generation Unit 35 call response signal generation unit 36 disconnection signal generation unit 37 communication request Signal generator 38 Radio carrier / slot allocation detector 39 Paging terminal response detector 40 Communication request signal receiver 41 End signal reception detector 42 Random signal detector 43 Busy / idle signal detector 44, 45 Gate circuit 46 Connection request detection Unit 47 terminal call setting unit 48 data terminal 47 49 data transmission path 50 data reception path

Claims (3)

[Claims] 1. A wireless digital communication system in which a base station and a plurality of terminal stations communicate via a time-division multiplexed radio channel, wherein the base station connects a group communication from the terminal station with a plurality of terminal stations specified. In response to the request, the terminal station assigns the same communication channel in different unit multiplex times on the time division multiplex radio line to each of the plurality of terminal stations requesting communication and issues a connection request. Allocating means for notifying the terminal station of the allocation content, wherein the terminal station receives the notification of the allocation content and sequentially communicates with each terminal station using the allocated communication channel. A wireless digital communication system comprising data collection means. 2. In a wireless digital communication system in which a base station and a plurality of terminal stations communicate via a time division multiplexed radio line, the base station includes a plurality of terminals in response to an external connection request for simultaneous communication. Assigning means for assigning the same communication channel within the same unit multiplex time on the time-division multiplexed radio line to the station; and simultaneous communication requesting means for issuing a communication request to the plurality of terminal stations to indicate simultaneous communication; A simultaneous data transmitting means for simultaneously transmitting data to a plurality of terminal stations using a communication channel. 3. A wireless digital communication system in which a base station and a plurality of terminal stations communicate via a time-division multiplexed radio channel, wherein the base station comprises a plurality of terminals in response to an external random communication connection request. Allocating means for allocating the same communication channel within the same unit multiplex time on the time-division multiplexing radio line to the station; and random communication requesting means for making a communication request to the plurality of terminal stations that random communication is possible. Receiving a communication request from the terminal station, transmitting a line busy signal to another terminal station, and transmitting a line idle signal to the other terminal station in response to communication termination of the terminal station which has issued the communication request. A wireless digital communication system comprising: line control means.