JP2002344381A - Digital mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to fully exhibit various kinds of functions and performance required for business a communication. SOLUTION: In a digital mobile communication system in which a command station is connected to a plurality of radio terminal stations via a base station in a TDMA method, in response to a request of simultaneous communication from the command station 10a, a base station 10 pages each terminal station simultaneously and independently on the basis of a plurality of terminal numbers transmitted from the station 10a, and simultaneously transmits the signal from the station 10a to each terminal station whose call is established.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile communication system, and more particularly to a digital mobile communication system in which a command station is connected to a plurality of wireless terminal stations by a TDMA system via a base station.

[0002] This type of mobile communication system is suitable for application to a business (dedicated / private) digital mobile communication system. The mobile communication system for business is generally a closed system itself, and has functions suitable for each business. In particular, systems for public services (fire, electricity, gas, police, etc.) have special functions that are not found in other public mobile communication systems, such as broadcast (broadcast), command, and group communications. It is necessary that these functions be fully demonstrated in an emergency or disaster.

[0003]

2. Description of the Related Art Conventionally, when performing simultaneous communication by analog business mobile communication, it is necessary to sequentially group terminals with long analog paging signals (tone signals, PB signals, subcarrier signals). It took a long time (about several hundred ms to several seconds) for grouping. There is a method in which a plurality of terminals a, b, c, etc. are grouped (organized) in advance and called by a single group designation signal (group code signal). However, reorganization of groups is not easy. And lacked the flexibility of group formation.

Further, in the conventional business mobile communication, when an emergency communication occurs during communication on a certain channel, the priority is given to securing an emergency line, and the channel during the communication is forcibly disconnected. Therefore, the convenience of individual communication is sacrificed.

[0005] Further, in the conventional business mobile communication, voice and data cannot be transmitted on the same channel, and there has been a demand for a multimedia (a combination of voice and data, voice and image, etc.) of recent business communication. Was not flexible.

Further, in the conventional business mobile communication, since only one channel (time slot) is allocated to communication, a large amount of information cannot be transmitted at high speed.

[0007]

As described above, the conventional business mobile communication system cannot sufficiently exhibit various functions and performances required for business performance.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a mobile communication system capable of sufficiently exhibiting various functions and performance required for business communication. is there.

[0009]

The above-mentioned problem is solved, for example, by referring to FIG.
Is solved. That is, in the digital mobile communication system of the present invention (1), the command station transmits the TD
In a digital mobile communication system connected to a plurality of wireless terminal stations by the MA system, a base station 10
a) paging each terminal station individually and simultaneously according to a plurality of terminal numbers sent from the command station in accordance with a request for simultaneous communication from a, and simultaneously transmitting a signal from the command station to each terminal station connected to the call. It is.

In FIG. 1, for example, terminal stations 30a, 30
b is individually and simultaneously paged by each terminal number, grouped, and simultaneously communicated with them. Or terminal stations 30a, 30c
Are individually and simultaneously paged by each terminal number, grouped, and communicated simultaneously to them. In this case, paging by the terminal number (digital signal) is fast, so that any number of terminal stations can be easily organized / reorganized and broadcast simultaneously.

In the digital mobile communication system according to the present invention (2), in the digital mobile communication system based on the above-mentioned premise, the base station 10 performs paging of the terminal station 30 in accordance with a simultaneous communication request from the command station 10a. A call is connected by specifying a plurality of channels that do not overlap in time, data transmitted from the command station is mapped to each specified channel and transmitted, and the terminal station receives data of each specified channel in time series. , Are demapped to obtain received data.

FIG. 1A shows an example of a channel arrangement. Here, C-CH is a control channel, TCH11 to TCH11.
The TCH 34 is a communication (call) channel. For example, the base station 10 transmits the data sent from the command station 10a to each of the consecutive designated channels TCH12, TC
The terminal station 30 receives the data of each of the designated channels TCH12 and TCH13, and demaps them to obtain received data. Alternatively, the base station 10 transmits the data transmitted from the command station 10a to each of the discontinuous designated channels TCH2 in different radio carriers.
1, the terminal station 30
Receives the data of each of the designated channels TCH21 and TCH13 by switching the frequency, and demaps them to obtain received data. In any case, a large amount of data can be transmitted at high speed using a plurality of channels (time slots) per frame.

Preferably, in the present invention (3), in the above-mentioned present invention (2), the base station 10 designates communication type information corresponding to each of a plurality of designated channels and is transmitted from the command station 10a. The terminal station 30 maps the signal of each communication type to each corresponding designated channel and transmits the mapped signal.
Data of each designated channel is received in chronological order, and these are demapped to obtain received data.

For example, the base station 10 specifies communication type information (voice and data) corresponding to each of the plurality of designated channels TCH12 and TCH13, and also transmits a signal (voice and data) of each communication type transmitted from the command station 10a. ) Is mapped to each corresponding designated channel TCH12, TCH13 and transmitted, and the terminal station 30 transmits each designated channel TCH1
2, receive the data of the TCH 13 in time series, and demap them to obtain received data signals (voice and data). Therefore, it is possible to efficiently and flexibly cope with a request for multimedia communication such as voice + data and voice + image.

Further, in the digital mobile communication system according to the present invention (4), in the digital mobile communication system based on the above-mentioned premise, the base station 10 changes the channel to be used to another individual communication in response to a simultaneous communication request from the command station 10a. In this case, the communication channel is shifted to another vacant channel on the same or different frequency to continue the individual communication, and the vacant channel is allocated to the simultaneous communication.

For example, when the channel TCH13 to be used in the simultaneous communication is being used by another individual communication, the base station 10 shifts the communicating channel TCH13 to another free channel on the same or a different frequency, and The individual communication is continued, and the vacant channel TCH13 is allocated to the simultaneous communication. Therefore, priority / urgent communication can be executed without disconnecting individual communication. In addition, the wireless line (channel) is effectively used.

Further, in the digital mobile communication system according to the present invention (5), the input line of the communicating channel is switched in accordance with the communication type change request from the command station 10 in the digital mobile communication system based on the above-mentioned premise, and A base station 10 for notifying a communication type change request to a terminal station connected to the terminal, and a terminal station 30 for switching an output line of a communication channel according to the communication type change request notification from the base station. The communication type is changed without disconnecting the middle call.

The base station 10 communicates with the communicating channel TCH in accordance with the communication type change information (→ voice) from the command station 10a.
At the same time, the input line 22 is switched to the voice terminal side, and the communication type change information (→ voice) is notified to the terminal station 30 to which the call is connected. The terminal station 30 switches the output line of the communicating channel TCH22 to the voice terminal side in accordance with the communication type change information (→ voice) from the base station 10. In addition, the base station 10 switches the input line of the busy channel TCH22 to the data terminal side according to the communication type change information (→ data) from the command station 10a, and transmits the communication type to the terminal station 30 that connects the call. Notify the change information (→ data). The terminal station 30 receives the communication channel TC according to the communication type change information (→ data) from the base station 10.
The output line of H22 is switched to the data terminal side. Therefore, voice + data, voice +
It is possible to efficiently and flexibly cope with a request for multimedia communication such as an image.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the same reference numerals indicate the same or corresponding parts throughout the drawings. FIG. 2 is a diagram showing a configuration of the mobile communication system according to the embodiment, and shows an application example of the present invention to a business mobile communication system. This mobile communication system includes a command station 10a, one or more base stations 10 connected to the command station, and a plurality of wireless terminal stations 30 (semi-fixed stations 30) scattered under the base station.
A, portable station 30B, etc.).

There is also a system in which the command station 10a and the base station 10 are integrated. This communication system basically performs two-way communication.
A description will be mainly given of a case where communication is performed from 0a to the terminal station 30.

In the command station 10a, 11 is a voice terminal such as a telephone or a headset, 12 is a facsimile machine (FAX), 13 is a command board for business use, 14 is a personal computer (PC), and 15 is a plurality of voice terminals. A PBX device (PBX) that accommodates the FAX 11 and the FAX 12 and a router 16 that accommodates the command base 13 and the PC 14 in a LAN environment.

In the base station 10, reference numeral 17 denotes a radio channel controller, 17a denotes a mapping unit capable of mapping a transmission signal (voice and data) from the command station 10a to a plurality of communication channels, and 17b denotes a plurality of carriers (radio frequencies). And a wireless line having a plurality of channels (time slots), 17
c is a control unit for performing these controls, 18 is a wireless unit, and 19 is a transmitting and receiving antenna.

In the wireless terminal station 30, 31 is a voice terminal such as a telephone, 32 is a facsimile machine (FAX), 34
Is a personal computer (PC), 35 is a PBX device that accommodates a voice terminal or FAX (not shown), and 36 is a FAX
A digital adapter (DAD) accommodating digital terminals 32 and PC 34, a control unit 37 for controlling a data flow between each of these terminal devices and a radio unit 38 described later,
37a is a demapping unit capable of demapping received data of a plurality of communication channels, 38 is a radio unit 38a is TD
A synchronization control unit based on the MA system, TX is a transmission unit, RX is a reception unit, SY is a frequency synthesizer, C is a transmission / reception branching switch, and 39 is a transmission / reception antenna.

The base station 10 and the terminal station 30 are connected by a time division multiple access (TDMA) system. Under the multiple access (MA) scheme, the base station 10 allocates an empty channel for each call. Further, under the time division (TD) method, a single radio frequency (carrier) is time-divided into a plurality of communication channels (time slots) for use.

FIG. 3A shows an example of a communication channel arrangement. Here, C-CH is a control channel, and T-CH is an individual communication channel. The communication channel T-CH can be increased by adding radio frequencies (carriers), and the total number of channels required for the system depends on the number of terminal stations and traffic (traffic volume).
Is determined according to.

FIG. 3B shows a basic communication procedure of the system. The terminal station 30 is usually waiting on the control channel C-CH, and acquires various information (communication environment, communication state information, and the like) using broadcast information. When a call is generated in the terminal station 30, the terminal station 30 notifies the base station 10 of a connection request via the control channel C-CH. The base station 10 having received the request searches for and extracts an empty channel and designates a channel to the terminal station 30 via the control channel C-CH. Upon receiving this, the terminal station 30 shifts to the designated channel and performs communication. On the other hand, when performing simultaneous communication from the command station 10a to all stations / each group station, the voice terminal of the command table 13, the PC 14, and the like are connected to the communication channel of the base station 10 to transmit voice, data, and FA.
X simultaneous communication is performed. Hereinafter, the simultaneous communication from the command station 10a will be described in detail.

FIG. 4 is a sequence diagram of the simultaneous communication according to the embodiment, and shows a communication sequence in the case where the command station (base station) performs the simultaneous communication by voice / data / FAX to all stations / group stations to be arbitrarily formed. ing. In the figure,
CAC is a common access channel, which includes a broadcast channel BCCH, a paging channel PCH, an individual cell signaling channel SCCH, and the like. USC
Reference numerals 1 and 2 denote time-division call (communication) channels. The illustration of the command station 10a is omitted. The simultaneous command communication includes all-station simultaneous communication in which all stations are to be communicated, and group simultaneous communication in which an arbitrary terminal station is selected (grouped).

Normally, each of the terminal stations 1 to n transmits a broadcast channel B
CCH is being received. When there is simultaneous transmission from the command station 10a, transmission control is performed based on the broadcast information from the base station 10, and transmission from each of the terminal stations 1 to n is restricted. Next, the base station 10 performs paging for all stations or group stations arbitrarily formed by specifying each terminal number via the CAC.

FIG. 6 shows the number system of the terminal station. FIG.
(A) shows a numbering system for individual / grouping selection, for example, bit 19 of a call code composed of all 20 bits.
(Identifier) = "1" indicates that the following 19 bits are terminal numbers to be individually or arbitrarily grouped. If this is represented by a system code, "80000h"
To "FFFFFh" (h is hexadecimal display).

FIG. 6B shows a numbering system for selecting a group formed in advance, where bit 19 (identifier) =
"0" indicates that the following 19 bits are a group selection number. When this is represented by a system code, "00
000h ”to“ 7FFFFh ”. However, the code “7FFFFh” always indicates designation of all terminal stations.

Returning to FIG. 4, in the step, paging of the terminal station is performed. For example, system code "80001h"
, The terminal having the terminal number “0001h” is individually specified. At this time, if another system code "80003h" is continuously designated, the terminal number "0003
h "is grouped into the terminal having the terminal number" 0001h ". In this way, a plurality of terminal stations can be flexibly grouped at once. Therefore, it is possible to flexibly perform reassignment of operations, reorganization due to an emergency or disaster, or reassignment of a group due to support for another group.

Alternatively, for example, the system code “000”
01h ", the group number" 000
A plurality of terminal stations organized in "1h" are designated at once. Alternatively, by specifying the system code “7FFFFh”, all terminal stations are specified at once.

Next, the base station 10 transmits a synchronization signal SB1 to each terminal station 30 via the USC1 (and if necessary, the USC2), and specifies a radio channel via the CAC in this step. Each terminal station 30 receiving this switches the radio frequency to the designated channel, and subsequently establishes synchronization with the base station 10 by exchanging BS2 to BS4 (not shown).

In the present embodiment, a command of a newly provided activation channel is transmitted together with the designation of the wireless channel, and the control unit 37 of the terminal station 30 receiving the command transmits a communication medium (voice / data / FAX). Recognize and connect the output line to the corresponding device (telephone / PC / FAX). Therefore, the setting and change of the communication medium can be easily performed by the simple control of transmitting the activation channel command together with the designation of the wireless channel.

Next, when the base station 10 sets the TCH busy / idle bit B / I = B (busy), the terminal station 30
Transmission on the communication channel T-CH is impossible, and simultaneous communication from the base station 10 can be received. After that, in step, the broadcast information (voice / data / F
AX).

FIG. 5 is a sequence diagram of the response confirmation communication according to the embodiment, and shows a case where the base station or command station that has performed the above-mentioned simultaneous transmission obtains a response confirmation from each terminal station 30 by, for example, a polling method. . The base station 10
By setting the B / I bit of H = I (idle), transmission from the terminal station 30 is enabled. Next, a response confirmation request is transmitted from the base station 10, and the terminal station 30 receiving this transmits a response confirmation response. By performing this process sequentially for each terminal station 30, a response confirmation from all terminal stations 30 can be obtained.

The operation of the basic simultaneous communication has been described.
Hereinafter, various embodiments for effectively using the communication channel will be described. First, for example, by assigning a single communication channel to a plurality of terminal stations 30 at the same time, a plurality of terminal stations 30 can simultaneously share a single communication channel. In this case, a plurality of terminal stations are sequentially paged in the step of FIG.
0, the same communication channel is designated, and synchronization SB1 to SB4 is individually established for each terminal station 30. Thereby, in that step, simultaneous communication from the base station (command station) 10 is performed by a plurality of terminal stations 3 via a single communication channel.
0 is received all at once.

Although general voice communication is performed using a single communication channel (time slot) for each frame, there is a case where a large amount of data is desired to be transmitted at a high speed.
Therefore, in this embodiment, in order to transmit information (9600 bps, etc.) having a capacity larger than that which can be transmitted using a single communication channel, information must be transmitted at high speed using a plurality of channels in one frame. Has been realized.

In this case, the base station 10 specifies, for example, a plurality of communication channels (slots) within a single carrier (frequency), maps transmission data from the command station 10a to each specified channel, and transmits the data. On the other hand, in this case, the terminal station 30 receives the reception data of each designated channel in a time series, and demaps them in the demapping unit 37a corresponding to the designated channel and reproduces the original data to reproduce the original data. Output to Therefore, high-speed communication using a plurality of slots in one frame can be performed.

FIG. 7 shows various examples of a single carrier (frequency) / 2 channel (slot) communication arrangement. FIG. 7A shows a case where consecutive slots 2 and 3 are assigned to simultaneous command channels (1) and (2). Normally, since information is input serially, it is desirable that continuous channels can be secured even when a plurality of channels are allocated. The same applies to FIGS. 7B and 7F.

When a continuous channel cannot be secured, it is also possible to select discrete channels in a time series as shown in FIGS. 7 (c) to 7 (e). In this case, the base station 10 holds the transmission data from the command station 10a in a buffer of the mapping unit 17a, and transmits (synchronizes) them with each transmission slot timing.

FIG. 8 shows an example of a multi-carrier, two-channel communication arrangement, which is effective when it is not possible to secure a space for two channels in a single carrier. In an emergency or disaster, the radio line is congested, and in such a case, an urgent and important communication request is usually generated. Emergency communication originally needs to be quickly transmitted as top priority communication even when traffic is congested. When it is difficult to secure adjacent channels, an arbitrary plurality of slots are used.

In FIG. 8A, only slot 1 is vacant in carrier 1 and only slot 2 is vacant in carrier 2. In this case, the base station 10 temporarily converts the continuous information frame input from the command station 10a into the mapping unit 1.
7a, decompose them into different transmission data for different carriers and different channels, and map them to each communication channel.

For example, as shown in FIG.
The broadcast command communication channel (1) is allocated to the slot 1 of the carrier 2 and the broadcast command communication channel (2) is allocated to the slot 2 of the carrier 2. Then, the information of the mapped carrier and channel is notified to the terminal station 30.

In the terminal station 30 in this case, the demapping unit 37a demaps (assembles) the data of each reception slot according to the designated channel information and outputs the data to the corresponding terminal device. That is, first, synchronization is made with slot 1 of carrier 1, and data is received. Next, the frequency of the receiver RX is changed to the carrier 2 in synchronization with the timing at which the synchronization controller 38a detects slot 2 (common to all carriers).
To receive the data of slot 2. afterwards,
Return the receiving frequency to carrier 1. Therefore, high-speed simultaneous communication of data using a plurality of slots of a plurality of carriers becomes possible.

FIG. 9 is a sequence diagram of channel relocation communication during communication, and shows a case where a channel during individual communication is relocated within the same carrier to secure a free channel for simultaneous communication. Now, assuming that the terminal station 1 is in an individual call using the USC3, the base station 10 sends a communication channel switching command to the terminal station 1 to the terminal station 1 via the USC3. Upon receiving this, the terminal station 1 returns a channel switching response and prepares for synchronization with the USC1. On the other hand, when the base station 10 sends the synchronization signal SB1 via the USC1, the base station 10 establishes synchronization with the USC1 through the subsequent exchange of SB2 to SB4. Thereafter, the call is continued via USC1. On the other hand, the procedure of the simultaneous communication is executed from the base station 10 via the USCs 2 and 3, and thereafter, the simultaneous communication using the two channels of the USCs 2 and 3 is performed.

FIG. 10 shows an example of a procedure for rearranging channels within a single carrier. In FIG. 10A, only the channel 3 is empty. Thereafter, in FIG. 10B, channel 1 is also empty, and as a result, channels 1 and 3 are empty. At this time, if an emergency broadcast occurs, preferably,
I want to secure two free channels that are continuous in a single carrier. Therefore, in FIG. 10C, the individual communication of channel 2 is moved to channel 1. And
In FIG. 10D, simultaneous command communication is performed using the vacant channels 2 and 3.

FIGS. 11 and 12 are sequence diagrams (1) and (2) of channel relocation communication over a plurality of carriers. In a state where only one free channel exists on a specific carrier, a request for emergency simultaneous communication is made. In such a case, a case is shown where an individual communication channel in the carrier is shifted to an empty channel in another carrier, and a continuous empty channel in a specific carrier is secured.

In FIG. 11, USC1-2, USC1
-3, it is assumed that an emergency communication has occurred during the individual call between the terminal stations 1 to 3 via the USC 1-4. First, the terminal performs channel switching during communication with the terminal station 1 and moves to the USC 2-2.
Continue the call. Next, a channel change is performed for the terminal station 2 during communication to move the terminal station 2 to the USC 3-1 and the communication is continued. In FIG. 12, next, the terminal station 3 switches the channel during communication to move to the USC 4-4, and continues the call. Then, the vacant USC1-1, USC1-
2. Simultaneous command communication is performed using USC1-3.

FIGS. 13 and 14 are diagrams (1) and (2) showing an example of a channel relocation procedure over a plurality of carriers. Emergency communications of high importance are not only of high priority,
There needs to be immediacy. In this case, it is necessary to transmit information promptly irrespective of the size of the information, and for that purpose, it is preferable to use all channels of the communication carrier to transmit information at a higher speed. Hereinafter, an example of the operation will be specifically described.

In FIG. 13A, an empty channel exists in each of the carriers 2 to 5. At this time, it is assumed that emergency communication has occurred. In FIG. 13 (B), channel 2 during individual communication on carrier 2 is used for empty channel 2 on carrier 3, channel 3 during individual communication on carrier 2 is used for empty channel 1 on carrier 4, and individual communication on carrier 2 is performed. Channel 4 is relocated to the empty channel 4 of the carrier 5, and the individual communication is continued. As a result, in FIG.
Is vacant. Therefore, in FIG. 14B, the simultaneous communication (1) to (4) is assigned to all the channels 1 to 4 of the carrier 1.

FIG. 15 is a sequence diagram of a multi-channel / multimedia communication, showing a case where a plurality of channels in a single carrier are used for voice and data communication. The basic sequence may be the same as that described in FIG. However, in this step, the activation channel = voice is specified for USC1, and the activation channel = data is specified for USC2. In this case, the base station 10 buffers the voice and data from the command station 10a and transmits the voice to the USC.
1 and the information data is mapped to USC2. On the other hand, in the terminal station 30 receiving this, the demapping unit 37a uses the USC according to the channel designation information (activation channel information) previously received from the base station 10.
1 audio data is distributed to the audio terminal 31 (demapping)
And the information data of USC2 is the data terminal 34/32
Deliver to (demapping).

Thus, the data information transmitted by the commander of the command station 10a by operating the PC 14 or the like together with the voice command is transmitted to the plurality of channels USC1 and USC2 in a single carrier.
And received by the terminal station 30. Therefore,
It is possible to efficiently cope with requests for multimedia communication (voice + data, voice + image, etc.).

By specifying different carriers (frequency), it is possible to perform multi-carrier / composite media communication. However, in this case, the terminal station 30 hops the frequency in synchronization with the designated channel.

FIG. 16 is a sequence diagram of the medium switching communication during communication, and shows a case where the communication type is switched while the line in use is continuously maintained without disconnecting the line. FIG. 16A shows a case where a request for data communication occurs at the command station 10a during voice communication in USC1. The base station 10 that has received this request notifies the terminal station 30 via the USC 1 of the request, and switches the input signal of the USC 1 in the mapping unit 17 a from the voice terminal 11 to the PC 14. On the other hand, in the terminal station 30, US
The destination of the received data of C1 is switched from the voice terminal 31 to the PC 34.

FIG. 16B shows a case where the command station 10a issues a voice communication request during data communication in the USC1. Base station 10 that has received this request
Then, this is notified to the terminal station 30 via the USC 1, and the input signal of the USC 1 in the mapping unit 17 a is switched from the PC 14 to the voice terminal 11. On the other hand, the terminal station 30 switches the destination of the USC1 reception data from the PC 34 to the voice terminal 31. Therefore, communication can be continued by switching the communication type without disconnecting the call.

Although the preferred embodiments of the present invention have been described, it goes without saying that various changes in the configuration, control, processing, and combinations thereof can be made without departing from the spirit of the present invention. There is no.

(Supplementary Note 1) TD via command base station via base station
In a digital mobile communication system in which a plurality of wireless terminal stations are connected by the MA system, a base station individually and simultaneously paging each terminal station by a plurality of terminal numbers sent from the command station in accordance with a request for simultaneous communication from the command station. Along with
A digital mobile communication system for simultaneously transmitting a signal from a command station to each terminal station connected to a call.

(Supplementary note 2) The digital mobile communication system according to supplementary note 1, wherein the base station designates the same communication channel for a plurality of terminal stations and performs simultaneous communication on the designated channel.

(Supplementary Note 3) TD via command base station via base station
In a digital mobile communication system connected to a plurality of wireless terminal stations by the MA system, a base station designates a plurality of channels that do not overlap in time when paging a terminal station in accordance with a request for simultaneous communication from a command station. While connecting the call, the data sent from the command station is mapped to each designated channel and transmitted, and the terminal station receives the data of each designated channel in chronological order, and demaps them to obtain the received data. A digital mobile communication system, characterized in that:

(Supplementary note 4) The digital mobile communication system according to supplementary note 3, wherein the base station designates a plurality of time-divided continuous channels on a single frequency.

(Supplementary note 5) The digital mobile communication system according to supplementary note 3, wherein the base station designates a plurality of time-division vacant channels on a single frequency or different frequencies.

(Supplementary note 6) The terminal station according to supplementary note 5, wherein the terminal station switches the reception frequency in accordance with the designated channel, receives the data of each designated channel, and demaps the data to obtain the received data. Digital mobile communication system.

(Supplementary Note 7) The base station specifies communication type information corresponding to each of the plurality of designated channels, and also maps signals of each communication type sent from the command station to each corresponding designated channel and transmits them. 4. The digital mobile communication system according to claim 3, wherein the terminal station receives data of each designated channel in time series, and demaps the data to obtain received data.

(Supplementary Note 8) TD via command base station via base station
In a digital mobile communication system in which a plurality of wireless terminal stations are connected by the MA system, a base station, according to a request for simultaneous communication from a command station, if a channel to be used is being used by another individual communication, the channel being used for communication. To a vacant channel on another same or different frequency to continue the individual communication, and allocate the vacant channel to simultaneous communication.

(Supplementary note 9) The digital mobile communication system according to supplementary note 7, wherein the base station allocates all channels on a certain frequency to communication with high priority.

(Supplementary Note 10) When the command station transmits T via the base station,
In a digital mobile communication system in which a plurality of wireless terminal stations are connected by the DMA method, an input line of a communication channel is switched according to a communication type change request from a command station, and the call is communicated to a terminal station connected thereto. A base station that notifies a type change request, and a terminal station that switches the output line of a communicating channel in accordance with the communication type change request notification from the base station, and changes the communication type without disconnecting a call during communication. A digital mobile communication system, comprising:

[0068]

As described above, according to the present invention, functions such as simultaneous communication and emergency communication can be sufficiently exhibited, which greatly contributes to the improvement of services of a commercial mobile communication system.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing a configuration of a mobile communication system according to an embodiment.

FIG. 3 is a diagram illustrating a channel arrangement.

FIG. 4 is a sequence diagram of simultaneous communication according to the embodiment.

FIG. 5 is a sequence diagram of response confirmation communication according to the embodiment.

FIG. 6 is a diagram illustrating a numbering system of a terminal station.

FIG. 7 illustrates a single carrier, two channel communication arrangement.

FIG. 8 is a diagram illustrating a multi-carrier two-channel communication arrangement.

FIG. 9 is a sequence diagram of channel relocation communication during communication.

FIG. 10 is a diagram illustrating an example of a channel relocation procedure within a single carrier.

FIG. 11 is a sequence diagram (1) of channel relocation communication over a plurality of carriers.

FIG. 12 is a sequence diagram (2) of channel relocation communication over a plurality of carriers.

FIG. 13 is a diagram (1) illustrating an example of a channel rearrangement procedure over a plurality of carriers.

FIG. 14 is a diagram (2) illustrating an example of a channel rearrangement procedure over a plurality of carriers.

FIG. 15 is a sequence diagram of multi-channel / multimedia communication.

FIG. 16 is a sequence diagram of a medium switching communication during communication.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base station 10a Command station 11 Voice terminal 12 Facsimile machine (FAX) 13 Command board 14 Personal computer (PC) 15 PBX device (PBX) 16 Router 17 Radio line control unit 17a Mapping unit 17b Radio line 17c Control unit 18 Transmission / reception antenna 30 Radio terminal station 31 Voice terminal 32 Facsimile machine (FAX) 34 Personal computer (PC) 35 PBX device 36 Digital adapter (DAD) 37 Control unit 37a Demapping unit 38 Radio unit 38a Synchronization control unit 39 Transmit / receive antenna TX transmission unit RX reception unit SY frequency synthesizer C transmit / receive branching switch

Continued on front page F term (reference) 5K028 BB06 CC05 DD01 DD02 EE07 HH00 5K067 AA34 CC04 CC14 EE02 EE10 EE22 EE61 EE71 GG01 GG03 GG11 JJ02

Claims (5)

[Claims] In a digital mobile communication system in which a command station is connected to a plurality of wireless terminal stations by a TDMA method via a base station, a base station transmits a plurality of radio terminals transmitted from the command station in response to a request for simultaneous communication from the command station. A digital mobile communication system characterized in that each terminal station is individually and simultaneously paged by the terminal number, and a signal from a command station is simultaneously transmitted to each terminal station connected to the call. 2. A digital mobile communication system in which a command station is connected to a plurality of wireless terminal stations by a TDMA method via a base station. In a digital mobile communication system, a base station paging a terminal station in accordance with a request for simultaneous communication from the command station. Connect the call by specifying multiple channels that do not overlap in time, map the data sent from the command station to each specified channel and send it, and the terminal station receives the data of each specified channel in time series A digital mobile communication system characterized in that the received data is obtained by demapping them. 3. The base station specifies communication type information corresponding to each of the plurality of designated channels, maps a signal of each communication type sent from the command station to each corresponding designated channel, and transmits the mapped signal. 3. The digital mobile communication system according to claim 2, wherein the terminal station receives data of each designated channel in time series, and demaps the data to obtain received data. 4. In a digital mobile communication system in which a command station connects to a plurality of wireless terminal stations by a TDMA method via a base station, the base station uses another channel in response to a request for simultaneous communication from the command station. In the case of being used by individual communication, the communication channel is shifted to another vacant channel on the same or different frequency to continue the individual communication, and the vacant channel is allocated to simultaneous communication. Digital mobile communication system. 5. A digital mobile communication system in which a command station connects to a plurality of wireless terminal stations by a TDMA system via a base station, in response to a request for changing the communication type from the command station, switches an input line of a communicating channel. A base station that notifies the terminal station connected to the call of a communication type change request,
A digital mobile communication system, comprising: a terminal station for switching an output line of a communicating channel in response to a communication type change request notification from a base station, wherein the communication type is changed without disconnecting a call in communication.