JPS6327150A - Satellite channel relaying system for mobile communication - Google Patents

Abstract

PURPOSE:To use a channel with high efficiency and to absorb a traffic fluctuation in terms of a place and time by applying the satellite channel which can control the demand assignment to the inter-station line between an exchange and a base station. CONSTITUTION:If a subscriber 1 dials to a land mobile radiotelephone 28 and there is no connection line from a nearest trunk exchange 5 to a land mobile radiotelephone exchange 9, a line 48 is selected and a selection signal is transmitted to a demand assign control station 33. Said station 33 selects the satellite channel and transmits a satellite incoming call signal to the exchange 9. Said exchange 9 calls the land mobile radiotelephone 28 and instructs the connection of a line 52 to the satellite ground station 44 with a radio channel 24 to a radio base station 20. Said exchange 9 transmits a call instruction signal including identification information on the satellite ground station 44 and that on the line 52 to the control station 33. Said station 33 connects the line 48 to a specific satellite channel which always transmits a ring-back tone. Said exchange 9 transmits the call instruction signal and rings the bell of the land mobile radiotelephone 28. If the exchange 9 receives the subscriber's response, the control station 33 cuts off the satellite channel line 48 and connects the line 52 with a line 56.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mobile telephone system in which a service is configured by covering a wide area with a small cell-like wireless zone. By applying satellite lines to
This paper relates to a satellite line relay switching system for mobile communications that enables highly efficient use of lines and absorption of spatial and temporal traffic fluctuations.

[Conventional technology]

Conventionally, mobile telephone networks consist of radio base stations placed in cellular radio zones to effectively utilize radio frequencies, and mobile telephone exchanges that store subscriber information of mobile subscribers and control call connections. Dedicated direct lines between base stations and mobile telephone exchanges, and between mobile telephone exchanges; general telephone networks are dedicated direct lines between gate exchanges and mobile telephone exchanges located in each region within the general telephone network. The system was configured by

FIG. 5 shows an example of a conventional car telephone system, in which 1 and 2 are subscribers of the general telephone network, 3 and 4 are local exchanges accommodating subscribers 1 and 2, respectively, and 5 and 6 are connected to the mobile network. 7 and 8 are dedicated relay lines, 9 and 11 are car telephone exchanges, 10 is a dedicated relay line, 12 to 15 are dedicated lines to the wireless base station, and 16 to 19 are dedicated relay lines. Common side to wireless base station? 111 line, 20-23 are wireless base stations, 24-
27 is a wireless line and 28 to 31 are car telephones.

FIGS. 6, 7, and 8 are connection procedure diagrams showing a mobile phone call receiving procedure originating from a general telephone, a general telephone call receiving means originating from a mobile phone, and a mobile telephone receiving procedure originating from a mobile phone, respectively. Note that in these figures, ninny indicates a signal sent and received over the common control line.

Next, the operation of this conventional example will be explained.

∎ Procedure for receiving a mobile phone call from a general telephone The procedure will be explained with reference to FIGS. 5 and 6. When the subscriber 1 dials the mobile telephone 28, the call is connected to the nearest trunk exchange 5 according to a known procedure, and the trunk exchange 5 selects the dedicated trunk line 7 to terminate the call at the mobile telephone exchange 9. If there is no connectable dedicated trunk line, the trunk exchange 5 connects to the busy trunk and loses the call. On the other hand, the car telephone exchange 9 that received the call calls the car phone 28 using the common control line 16 using known location registration control or simultaneous call control.
Dedicated diagram when mobile device response is received! ! , 'i 12 and the wireless line 24 using a channel designation signal, and sends out a subscriber call instruction signal to cause the car telephone 28 to ring. It also sends subscriber 1 calling back tone. Disconnect ring hack tone with subscriber response Subscriber 1
and the car phone 28. If there is no free space on the dedicated line to the base station, the car telephone exchange 9 connects to the busy trunk and loses the call. The call is released by a disconnection signal from the general network or a call termination signal from the car telephone.

③ Mobile telephone origination and general telephone call reception procedure will be explained with reference to FIGS. 5 and 7. When the car telephone 29 makes a call and dials the subscriber 2, a calling signal is sent to the car telephone exchange 9 via the common control line 17. Upon receiving this calling signal, the car telephone exchange 9 connects the dedicated line 13
After setting up a radio line 25 and connecting the call to its own exchange, and identifying the destination by number, the dedicated trunk line 8 is selected and the call is connected to the relay exchange 6. If either the dedicated line to the base station or the dedicated relay line is free, the car telephone exchange 9 connects to the busy trunk and loses the call.

On the other hand, the relay exchange 6 that receives the call connects to the subscriber 2 using the same procedure as a regular telephone. The call is released by a disconnection signal from the car telephone or a call termination signal from the general network.

■ Mobile phone origination and mobile phone reception procedure will be explained with reference to FIG. 5 and Part 8. When the car phone 30 dials the car phone 31, a calling signal is sent to the car phone exchange 9 via the common control line 18. Upon receiving the call signal, the car telephone exchange 9 connects the dedicated line 14.
When the wireless line vA26 is set up and the call is connected to the own exchange, the destination of the call is identified by the number, and the dedicated trunk line 10 is connected.
Select , and connect the call to the car telephone exchange 11. If either the dedicated line to the base station or the dedicated relay line is free, the car telephone exchange 9 connects to the busy trunk and makes the call. On the other hand, the car telephone exchange 11 that received the call calls the car phone 31 using the common control line 19 using known location registration control or simultaneous call control, and transfers the call! l] Upon receiving the machine response, the dedicated line 15 and the wireless line 27 are set up using a channel designation signal, and a subscriber calling instruction signal is sent out to cause the car telephone 31 to ring. It also sends out the car phone 30 Heringhack tone. In response to the subscriber's response, the ringback tone is disconnected and the car telephones 30 and 31 are connected.

If there is no free space on the dedicated line to the base station, the car telephone exchange 11 connects to the busy trunk and loses the call. The call is released by a disconnection signal from the calling party or a call termination signal from the called party.

[Problem that the invention seeks to solve]

In this way, in the conventional system, dedicated lines are used between relay exchanges (gate exchanges), car telephone exchanges, and wireless base stations, making it difficult to provide services in most areas, except for large cities with relatively large numbers of mobile subscribers. If you provide
This had the disadvantage of making it difficult to recover the investment because it required the installation of inefficient lines and car telephone exchanges.

Furthermore, in the case of car telephones, there are many cases in which mobile subscribers concentrate due to traffic jams or various events, and telephone traffic tends to fluctuate both geographically and temporally. However, the method of setting such traffic fluctuations has the disadvantage that it is not possible to economically remedy such traffic fluctuations.

An object of the present invention is to eliminate the above-mentioned drawbacks by applying a satellite line capable of demand assignment control to the inter-office line between the switching center and the base station, thereby improving the efficiency of line usage and improving location and time traffic. The object of the present invention is to provide a satellite line relay switching system for mobile communications that makes it possible to absorb fluctuations.

[Means for solving problems]

The present invention connects a mobile telephone network including radio base stations and mobile communication telephone exchanges arranged in a cell shape and a general telephone network to each other via relay exchanges arranged in each region within the general telephone network. In the mobile communication relay system, when connecting a landline telephone and a mobile telephone or between mobile telephones,
If the number of vacant direct lines between the transit exchange and the mobile telephone exchange, between the mobile telephone exchanges, and between the mobile telephone exchange and the wireless base station is less than the specified number, the above The trunk exchange or the mobile telephone exchange requests the demand assignment control station that centrally manages the satellite line to set up the satellite line, and the demand assignment control station that receives this setting request transfers the satellite line selected from the mobile telephone exchange. The present invention is characterized in that a satellite line corresponding to the above request is set by receiving a communication ground station number and a line number to the satellite communication ground station.

[For production]

The present invention is applicable to cases where there are less than a predetermined number of free lines in the direct dedicated lines necessary to connect a landline telephone and a mobile phone or between mobile phones (including cases where there are none).
The relay exchange or mobile telephone exchange requests the demand assignment control station in the satellite communication system to set up a satellite line, and the demand assignment control station that receives this setting request sets up the required satellite line.

Therefore, communication is carried out using the direct dedicated terrestrial line when it is free, and via the satellite line when it is not available or when the number of lines is less than a predetermined number. This makes it possible to absorb significant traffic fluctuations.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a car telephone system according to an embodiment of the present invention. In this embodiment, the car telephone exchange 9 includes a dedicated trunk line 7 and a trunk exchange (gate exchange).
5 and the subscriber 1 connected via the subscriber exchange a3, a dedicated trunk line 8 to the car telephone exchange 9, and a trunk exchange (
A radio base station connected to the subscriber 2 via the gate exchange 6 and the subscriber exchange 4, and to the mobile telephone exchange 9 by dedicated lines 12, 13 and 14 and common control lines 16, 17 and 18, respectively. 20.21 and 22
, a mobile telephone exchange 11 connected to the mobile telephone exchange 9 via a dedicated relay circuit vAlO, a wireless base station 23 connected to the mobile telephone exchange 11 through a dedicated line 15 and a common control line 19, and a wireless base station. 20 to 23 and car telephones 28 to 3 connected by wireless lines 24 to 27, respectively.
1 and satellite communication ground stations 40 and 41 connected via lines 48 and 49 to transit exchanges 5 and 6, respectively.
and vA5 times to car telephone exchanges 9 and 11, respectively.
Satellite satellite ground stations 42 and 43 connected via lines 0 and 51, and lines 52 to radio base stations 20 to 23, respectively.
The common line signal link 3 is connected to the satellite communication base stations 44 to 47 connected through 55, the relay exchange 5, the relay exchange 6, the car telephone exchange 9, and the automatic telephone exchange 11, respectively.
6.37. A common line signal y434 connected by 38 and 39, and a demand assignment system ill station 33 connected to this common line signal network 34 by a common line signal link 35.
and a communication satellite 32 that connects each satellite communication base station 40 to 47 and a demand assignment control station 33 via a satellite line 56. Note that the satellite communication ground stations 40 to 47 include antennas and TDMA devices.

A feature of the present invention is that, in FIG. 1, a satellite communication system (communication satellite 32, common line signal M434, satellite communication base stations 40 to 47) is provided with a demand assignment control station 33 in addition to the conventional system shown in FIG. , and set up the line according to the connection procedure explained below.

Next, the operation of this embodiment will be explained with reference to the connection procedure diagrams shown in FIGS. 2 and 3. 2 is a connection procedure diagram showing a procedure for receiving a mobile phone call originating from a general telephone, FIG. 3 is a connection procedure diagram showing a procedure for receiving a general telephone call originating from a mobile telephone, and FIG. 4 is a diagram showing a procedure for receiving a mobile telephone call originating from a mobile telephone.

∎ Procedure for receiving a mobile phone call from a general telephone The procedure will be explained with reference to FIGS. 1 and 2. When the subscriber 1 dials the mobile telephone 28, the call is connected to the nearest trunk exchange 5 in a known manner. If there is a dedicated relay line that can be connected to the car telephone exchange 9, the relay exchange 5 connects to the car telephone exchange 9 using a conventional method, but if there is no line, it selects the line 48 to the satellite ground station 40 and connects it to the car telephone exchange 9 on demand. A selection signal is sent via the common line signal link 36 to request the assignment control station 33 to set up a satellite line. When the demand assignment control station 33 identifies that it is a car telephone relay call from the selection signal, it selects a satellite line and transmits the satellite incoming signal including the satellite line relay identification to the car telephone exchange 9 through common line signal links 35 and 38.
Send via. The car telephone exchange 9 calls the car phone 28 using known location registration control or simultaneous call control, and upon receiving a response from the mobile device, transmits a channel to the radio base station 20 to connect the line 52 to the satellite ground station 44 and the radio line 24. Instruct by designated signal.

In addition, the car telephone exchange 9 is a demand assignment control station 33.
A call instruction signal containing identification information of the satellite ground station 44 and identification information of the selected line 52 is sent to request the satellite to send a ringback tone to the line 48 and secure a satellite line. Demand assignment control station 33 connects line 48 to a specific satellite channel that is constantly transmitting ringback tones. The car telephone exchange 9 sends out a subscriber call instruction signal and causes the bell of the car phone 28 to ring. When the subscriber response is received at the output of the mobile telephone exchange 9, the demand assignment control station 33 disconnects the line 48 from the satellite channel that is transmitting the ringback tone and connects it to the line 52 through the previously secured satellite line 56.

To release the call, -ntQ) In the case of disconnection from M, the demand assignment control station 33 receives the disconnection signal from the relay exchange 5, releases the satellite line 56, and relays the disconnection signal to the mobile telephone exchange 9. By car phone 2
8 is terminated, the car telephone exchange 9 sends a termination signal to the demand assignment control station 33, and the demand assignment control station 33 releases the satellite line 56 and relays the termination signal to the relay exchange a5. conduct.

■ Mobile telephone origination and general telephone call reception procedure will be explained with reference to FIGS. 1 and 3. When the car telephone 29 makes a call and dials the subscriber 2, the car telephone exchange 9
If there is a dedicated line between the radio base stations 21 and a dedicated relay line between the relay exchanges 6, the conventional method can be used to connect the dedicated line 1, for example.
3 and wireless line vA25 and instructs the call to be connected to the own exchange, but if there is no free line on either side,
The wireless base station 21 is instructed to connect the call to the line 53 of the satellite ground station 45 via the wireless line 25. Furthermore, the mobile telephone exchange 9 sends a selection signal including the telephone number and identification information of the satellite ground station 45 and the selected line 53 to the demand assignment control station 33. The demand assignment control station 33 that has received this selection signal selects the relay exchange 6, satellite ground station 41, and line 49 closest to the destination subscriber based on the telephone number, and also transmits the common line signal link 35.
A selection signal including the telephone number and the identification information of the line 49 is sent to the relay exchange 6 via the
3 and line 49. Trunk exchange 6 that received the call
connects to subscriber 2 using the same procedure as for a regular telephone.

The call is released by, when the car telephone 29 disconnects, the demand-assign control station 33 receives a disconnection signal from the car telephone exchange 9, releases the satellite line 56, and relays the disconnection signal to the relay exchange 6. When ending a call from the general network, the relay exchange 6 sends a call end signal to the demand assignment control station 33, and the demand assignment control station 33 releases the satellite line 56 and relays the call end signal to the car telephone exchange 9. This is done by

② Mobile phone origination and mobile phone call reception procedure will be explained with reference to FIGS. 1 and 4. When the car phone 30 dials the car phone 31, the car phone exchange 9 connects, for example, the dedicated line 14 and the wireless line 26 using a conventional method, if there is a dedicated relay line between the wireless base station 22 and the car phone exchange 11. If there is no free line on either side, the radio base station 22 instructs the call to be connected to the satellite ground station 46 via the radio line 26 to the line 54 of the satellite ground station 46. Instruct to. Furthermore, the mobile telephone exchange 9 sends a selection signal including the telephone number and identification information of the satellite ground station 46 and the selected line 54 to the demand assignment control station 33. The demand assignment control station 33, which has received this selection signal, calls the mobile phone exchange 11, which is the home station of the younger subscriber, from the telephone number via the common line signal links 35 and 39. Sends a satellite incoming signal containing a number and satellite link relay identification. The car telephone exchange 11 calls the car phone 31 using known location registration control or simultaneous call control,
Upon receiving the mobile device response, it instructs the radio base station 23 to connect the line 55 to the satellite ground station 47 and the radio line 27 using a channel designation signal.

Another car telephone exchange! In order to request the demand assignment control station 33 to send a ringback tone to the line 54 and secure the satellite line 56, the aircraft 11 sends a calling instruction including the identification information of the satellite ground station 47 and the identification information of the selected line 55. Send. Demand assignment control station 33 connects line 54 to a specific satellite channel that is constantly transmitting ring bank tones. The car telephone exchange 11 sends out a call instruction signal and causes the car phone 31 to ring. When the subscriber response is received via the car telephone exchange 11, the demand assignment control station 33 disconnects the line 54 from the satellite channel that is transmitting the ringback tone and connects it to the line 55 through the previously secured satellite line 56.

When the call is disconnected from the caller, the demand assignment control station 33 receives a disconnection signal from the mobile telephone exchange 9 and releases the satellite line, and the mobile telephone exchange 1
When the called party terminates the call by relaying a disconnection signal to the demand assignment control station 33, the car telephone exchange 11 sends a termination signal to the demand assignment control station 33.
releases the satellite line 56 and connects the car telephone exchange 9.
This is done by relaying the end-of-call signal to.

In addition, in ■--General call outgoing mobile phone call reception procedure, if the dedicated trunk line 7 is selected at the trunk exchange 5 and the call is received at the car telephone exchange 9, all the dedicated lines to the wireless base station 20 at the car telephone exchange 9 are blocked. In this case, the satellite line 56 can be selected to connect the mobile phone exchange and the radio base station 20 via the satellite ground station 42 and the satellite ground station 44.

〔Effect of the invention〕

As explained above, the present invention enables communication between a regular telephone and a mobile telephone or between mobile telephones, between a relay exchange (gate exchange @) and a car telephone exchange, between car telephone exchanges, and between a car telephone exchange and a wireless communication. If there is no free space on any direct dedicated line between base stations, you can use the terrestrial direct dedicated line by setting up a satellite link between the exchange and the base station or between base stations via the demand assignment control station. In addition to enabling highly efficient operation, even if traffic is concentrated in a specific wireless zone, it is possible to provide services without degrading connection quality by distributing satellite links. Also,? ? The cost of the 7-star line does not depend on distance or distance, so long-distance wireless zones can be accommodated in car telephone exchanges, and it is also possible to centrally control the whole country with one or several car telephone exchanges, making it possible to This has the effect of preventing an increase in communication costs and complexity of control due to the dispersion of information.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a car telephone system according to an embodiment of the present invention. 2 to 4 are connection procedure diagrams showing the operation of FIG. 1, respectively. FIG. 5 is a block diagram showing an example of a conventional car telephone system. 6 to 8 are connection procedure diagrams showing the operation of FIG. 5, respectively. ■, 2...Subscriber, 3.4...Subscriber exchange, 5.
6... Trunk switchboard, 7.8, IO...-dedicated trunk line, 9.11... Car telephone switchboard, 12-15...
Dedicated line, 16-19...Common control line, 20-23
...Radio base station, 24-27...Radio line, 28-
31...Car phone, 32...Communication satellite, 33...
・Demand assignment control station, 34... common line signal network,
35-39... Common line signal link, 40-47...
Satellite communication ground station, 48-55... line, 56... satellite line.

Claims (1)

[Claims] (1) A mobile telephone network including wireless base stations (20 to 23) arranged in cells and mobile communication telephone exchanges (9, 11) and a general telephone network are arranged in each region within this general telephone network. In a relay system for mobile communications that connects each other via relay exchanges (5, 6), when connecting a general telephone and a mobile telephone or between mobile telephones, the connection between the relay exchange and the mobile telephone exchange is , if the number of vacant direct lines between the mobile telephone exchanges or between the mobile telephone exchange and the radio base station is less than a predetermined number, the relay exchange or the mobile telephone exchange shall connect the satellite line. (
Demand assignment control station (33) that centrally manages 56)
The above-mentioned demand assignment control station, which has received this request for setting, receives the satellite communication ground station number selected from the above-mentioned mobile telephone exchange and the line number to this satellite communication ground station. , a satellite line relay switching system for mobile communication, characterized in that a satellite line corresponding to the above requirements is set up.