JPH01270422A - Mobile communication system - Google Patents

Abstract

PURPOSE:To simplify the calling and communicating operation at the time of transmitting the same contents to plural mobile stations by allowing plural mobile stations to hold a multiple address dial number and providing a mobile exchange with a multiple address connection control means. CONSTITUTION:Plural mobile stations 1-(n) hold their individual dial numbers as well as a multiple address dial number common to plural mobile stations, and each of mobile stations 1-(n) is provided with a simplex mode control means B. A mobile exchange 2 is provided with a multiple address connection control means A. When a connection request for the multiple address dial number is generated in the mobile exchange 2, the multiple address connection control means A of the exchange 2 acquires pertinent mobile stations 1-(n) and connects them to a calling station. Each mobile station controls its own transmission/reception mode to the simplex mode by the simplex mode control means B to perform the transmission and reception operation in the simplex mode when its own multiple address dial number comes from the exchange 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a mobile communication system in which terminals are connected via a full-duplex line, such as a car telephone system.

(Prior Art) Conventionally, this type of system consists of, for example, a mobile switching center connected to a wired switching center such as a subscriber network, a base station installed in each communication zone, and communication via these base stations. The network consists of a plurality of mobile stations connected to the mobile switching center. Each mobile station has its own individual dial number, and when a connection request is generated from a subscriber terminal or a mobile station in the subscriber network using the individual dial number, the mobile switching center transfers the corresponding mobile station to the base station. This system connects the calling station with the calling station, and thereafter allows simultaneous two-way communication between the calling station and the mobile station using a full-duplex line. Therefore, as long as the mobile station is within the service area, the mobile station can make a call just like a normal subscriber telephone call.

(Problem M to be solved by the invention) However, in this type of conventional system, each mobile station only has an individual dial number, so, for example, when a sales office contacts multiple sales vehicles with the same content, but,
The sales office must call each of these mobile stations individually and in turn to make contact with each of them. For this reason, it takes a lot of time to complete contacting all commercial vehicles, and each commercial vehicle must be called and contacted individually, making the operation extremely cumbersome and prone to erroneous connections due to erroneous operation. There was a problem in that it was more likely to occur.

The present invention focuses on this point and eliminates the need for individual calling and contact operations when sending the same information to multiple mobile stations, thereby shortening contact time and improving operability. The present invention aims to provide a mobile communication system that can reduce the occurrence of such problems.

[Structure of the Invention (Means for Solving the Problems) As shown in FIG. and providing a simplex mode control means B in the mobile station possessing these broadcast dial numbers,
A mobile switching center is provided with a broadcast connection control means, and when a connection request using a broadcast dial number is issued to the mobile switching center, the broadcast connection control means A acquires each corresponding mobile station. When a broadcast dial number for the local station arrives from this mobile switching center,
The mobile station is configured to perform transmission and reception operations in simplex mode using the simplex mode control means B.

(Effect) As a result, when calling multiple mobile stations with the same content, the caller only needs to make the call using the broadcast dial number held by these mobile stations. The caller no longer needs to perform call and contact operations for each mobile station individually, which greatly reduces the time required for contact, and also greatly simplifies call and contact operations. can do. Furthermore, since the calling operation that used to be performed for each mobile station can be completed with just one operation, the probability of occurrence of erroneous connections due to erroneous operation etc. is reduced, thereby increasing the effective use of lines. .

(Embodiment) FIG. 3 shows the configuration of a mobile communication system in an embodiment of the present invention. This system consists of a mobile telephone system, including a mobile telephone exchange 2 connected to a wired exchange 1 of a subscriber network, a plurality of base stations 31 to 3n arranged in each preset communication zone, and It consists of a large number of mobile stations 41-4m connected to the mobile telephone exchange 2 selectively via base stations 31-3n.

Incidentally, 51 to 5n indicate the communication zones of the respective base stations 31 to 3n, and 6 indicates the subscriber telephone of the subscriber network.

Each of the mobile stations 41 to 4m has an individual dial number corresponding to a normal telephone number, but any number of mobile stations among them has a common broadcast dial number in addition to the individual dial number. are doing.

On the other hand, the mobile telephone exchange 2 is equipped with broadcast connection control means in addition to normal connection control means based on individual dialed numbers. This broadcast connection control means is the subscriber telephone set 6 of the subscriber network.
Alternatively, when a connection request using a broadcast dial number arrives from the mobile stations 41 to 4n, all mobile stations possessing this broadcast dial number are captured and connected to the caller.

On the other hand, each mobile station 41 to 4m is equipped with simplex mode control means in addition to normal transmission/reception control means. FIG. 2 shows the configuration of the mobile stations 41 to 4m, which are composed of a communication unit 80 and a transmitting/receiving unit 70. Of these, the telephone unit 80 has a telephone circuit 81 and a telephone call control circuit 83, and a handset 82 is connected to the telephone circuit 81. Also connected to the call control circuit 83 are a key input section 84 for dial keys, function keys, etc., and a display section 85 for displaying dialed numbers, call time, etc. On the other hand, the transmitting/receiving unit 70 has a wireless transmitting/receiving circuit 71 and a modem 72.
Control information such as dial numbers encoded in 2 is transmitted and received. The transmitting/receiving unit 70 also includes a transmitting detection circuit 73 and a communication control circuit 74. The outgoing call detection circuit 73 detects whether or not a outgoing audio signal is being output from the calling unit 80 during a call. When the mobile telephone exchange 2 sends an incoming call signal containing the individual dial number of the mobile telephone exchange 2, the communication control circuit 74 sets the subsequent communication mode to the simplex mode and performs the operation of transmitting and receiving the call voice signal. .

Next, the operation of the system configured as above will be explained.

(1) When performing broadcast communication from a subscriber telephone When the subscriber telephone 6 dials the broadcast dial number of the desired mobile station group after going off-hook, the broadcast dial signal is sent to the subscriber telephone 6 as shown in FIG. The telephone number is then sent to the mobile telephone exchange 2 via the wired exchange 1. When this broadcast dialing signal arrives, the mobile telephone exchange 2 sends a request to all base stations 31 to 3n to transmit an incoming call signal including the broadcast dialing number, and also requests to transmit a call channel designation signal. Send. Then, each base station 31-3n first transmits an incoming call signal containing the above-mentioned broadcast dial number to each mobile station 41-4m within the zone. Then, when the mobile station possessing the broadcast dialing number starts up and sends back an incoming call response signal, each of the base stations 31 to 3n selects an empty communication channel and sends out the communication channel designation signal.
After the transmission is completed, a response signal is sent back to the mobile telephone exchange 2. Incidentally, if there is no free communication channel, a busy signal is sent back to the mobile telephone exchange 2.

Now, the mobile station that has been activated by detecting the broadcast dial number for its own station sends an off-hook signal to the base stations 31 to 3n as shown in FIG. 4 when the user goes off-hook in response to an incoming call. Then, the base stations 31 to 3n send a response signal back to the mobile telephone exchange 2, and the mobile telephone exchange 2
When detecting the response signal, it returns the response signal to the wired exchange 1. As a result, a communication path is formed between the subscriber telephone set 6, which is the caller, and each of the mobile stations that responded, and from then on, it becomes possible to broadcast calls from the subscriber telephone set 6 to each mobile station.

By the way, if each mobile station is in a state where it is possible to make two-way calls at the same time during the above-mentioned broadcast transmission, similar to normal telephone calls, multiple mobile stations in the same zone will transmit radio waves on the same frequency. This causes problems such as beats occurring at the base stations 31 to 3n, and radio waves on the side with weaker received radio wave strength being masked by radio waves on the stronger side, so that the transmitted voice is not transmitted to the subscriber telephone 6. , very unfavorable. Therefore, in this embodiment, each mobile station performs simplex mode control when making a call due to an incoming broadcast call.

That is, the communication control circuit 74 of the transmitting/receiving unit 70
It is monitored via the sending detection circuit 73 whether or not a sending audio signal is being output from the calling unit 80, and when the sending audio signal is not being output from the calling unit 80, it is determined that the call is being received. The transmitting operation of the wireless transmitting/receiving circuit 71 is stopped and only the receiving operation is performed. On the other hand, when the transmitting voice signal is being output from the communication unit 80, it is determined that the transmitting state is established, and the wireless transmitting/receiving circuit 71 stops receiving operations and only performs transmitting operations. By doing this,
Multiple mobile stations within the same zone will no longer transmit radio waves at the same time using the same communication channel, thereby preventing problems such as the occurrence of beats and masking of radio waves. Note that when set to simplex mode in this way, simultaneous two-way communication, which is one of the major advantages of telephone calls, cannot be performed; Since information is simply sent and the called party returns a response, there is no practical problem even if the callee is set to simplex mode as described above.

(2) When performing broadcast communication from a mobile station, for example, the fifth
As shown in the figure, when a mobile station 41 dials a broadcast dial number to perform broadcast communication to a group of arbitrary mobile stations, this mobile station 41 sends a calling signal containing the broadcast dial number. is sent to the base station 31. Then, the base station 31 selects an empty communication channel, sends the channel designation signal back to the mobile station 41, and notifies the mobile telephone exchange 2 of the broadcast dial number. On the other hand, if the above-mentioned broadcast dialed number belongs to another mobile telephone exchange, the mobile telephone exchange 2 sends it to the corresponding mobile telephone exchange via the wired exchange 1. On the other hand, if the call signal belongs to the own station, it sends an incoming call signal transmission request to the subordinate base stations 31 to 3n, and thereby all mobile stations 4
An incoming call signal containing the above broadcast dial number is sent to 2 to 4 meters.

On the other hand, when each mobile station 42 to 4m receives the above-mentioned incoming call signal, it determines from the broadcast dial number whether the call is to its own station or not, and if it is a call to its own station, it calls the base station 31. -3n returns an incoming call response signal. When an idle communication channel is selected by the base stations 31 to 3n and a channel designation signal is sent thereto, the transmitting/receiving channel of the radio transmitting/receiving circuit is set to this communication channel, an incoming call is made, and the system waits for off-hook. On the other hand, base station 31
3n sends a response signal to the mobile telephone exchange 2 after completing the transmission of the communication channel designation signal. Note that if there is no free communication channel, a busy signal is sent. Then, after sending out the response signal, the base stations 31 to 3n monitor the arrival of an off-hook signal from the mobile station,
When the mobile station goes off-hook and sends an off-hook signal in this state, it sends a response signal to the mobile telephone exchange 2.

As a result, the communication paths between the mobile station 41 on the calling side and the mobile station group are connected via the mobile telephone exchange 2, and from then on, the mobile station 41 transmits a broadcast call to the mobile station group. becomes possible. Also, at this time, each of the mobile station groups is in simplex mode.

In this way, with this embodiment, by sending a broadcast dial number, a desired group of mobile stations can be called simultaneously and a communication path can be formed for each group, so that the same message can be sent to multiple mobile stations. Even if you wish to do so, you can contact all mobile stations individually using the same operation as when making a call to one mobile station. Therefore, compared to the conventional system in which each mobile station had to make a call and transmit the contents of the communication, the time required for communication can be significantly reduced. In addition, the operation can be significantly simplified, thereby significantly reducing the probability of erroneous connection due to erroneous operation, and increasing the effective utilization rate of the line. Furthermore, since the mobile station operates in simplex mode when a broadcast call occurs, it is possible to prevent multiple mobile stations from being in the transmitting state at the same time in the same zone. The quality of the call can be improved by preventing generation and masking of transmitted radio waves.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and for example, the control contents of the simplex mode, the connection procedure in the case of broadcast calling, the type of mobile station, etc. may be changed without departing from the gist of the present invention. It can be implemented with various modifications.

[Effects of the Invention] As described in detail above, according to the present invention, a plurality of mobile stations can have individual dial numbers as well as a common broadcast dial number among the plural mobile stations, and these broadcast dial numbers can be The possessed mobile station is equipped with a simplex mode control means, and the mobile switching center is equipped with a broadcast connection control means, so that when a connection request using a broadcast dial number is made to the mobile switching center, the broadcast connection is executed. Each applicable mobile station is captured by the control means and connected to the calling station, and when the broadcast dial number of the own station arrives from this mobile switching center,
By allowing the mobile station to perform transmission and reception operations in simplex mode using the simplex mode control means, it is possible to eliminate the need for individual calling and contact operations when sending the same information to multiple mobile stations. This makes it possible to provide a mobile communication system that can shorten contact time, improve operability, and reduce the occurrence of erroneous connections.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of a mobile communication system according to the present invention, FIGS. 2 to 5 are for explaining a mobile communication system according to an embodiment of the present invention, and FIG. 3 is a functional block diagram showing the configuration of a mobile communication system according to the present invention. FIG. 2 is a circuit block diagram showing the configuration of a mobile station in the system, and FIGS. 4 and 5 are diagrams showing connection procedures, respectively. A: Broadcast connection control means, B: Simplex mode control means, 1: Wired exchange, 2: Car telephone exchange, 31-3n: Base station, 41-4m ...mobile station,
51-5n... Communication zone, 6... Subscriber telephone, 7
0... Transmitting/receiving unit, 71... Wireless transmitting/receiving circuit,
72...Modem, 73...Talking detection circuit, 74...
・Communication control circuit, 80...Telephone unit, 81...
Telephone circuit, 82...Handset, 83...Telephone control circuit, 84...Key power section, 85...Display section. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] It is equipped with a plurality of mobile stations and a mobile switching center, and when the mobile switching center receives a connection request for an arbitrary mobile station, it captures this mobile station and connects it to the calling station via a full-duplex line. In a mobile communication system that enables communication after connecting with
The plurality of mobile stations have individual dial numbers as well as a common broadcast dial number among the plurality of mobile stations, and the mobile switching center is configured to handle each corresponding mobile station when a connection request using the broadcast dial number occurs. If a plurality of mobile stations that each acquire a station and connect with the calling station and own the broadcast dial number are sent their own broadcast dial number from the mobile switching center when a call is received, A mobile communication system characterized by performing transmission and reception operations in simplex mode.