JPS61206333A - Mobile communication system - Google Patents

Abstract

PURPOSE:To improve the function and to attain miniaturization by designing the system that a carried auxiliary transceiver communicates with other subscriber while relaying a mobile terminal device when a mobile subscriber parts from a mobile installation on which the mobile terminal device. CONSTITUTION:When an auxiliary receiver TR makes a call via an on-vehicle device MSS, an auxiliary transceiver TR uses a reception channel CR of a control channel and when the on-vehicle device MSS in the standby state transmits a call signal, the device MSS identifies it and sends a call signal to a radio base station MBS and an automobile control exchange MCE while changing a flag through the transmission channel CT. When a transmission channel ST and a reception channel SR being normal talking channels are set between the device MSS and an automobile control exchange MCE the same as an incoming call, the device MSS sets one of transmission channel SAT of an idle standby talking channel between the TR and the MSS to start the said transmitter, that is, an extension transmitter TXA.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mobile communication system, and in particular, to a system that allows a mobile subscriber to perform communication equivalent to that of a mobile terminal even when he or she leaves a mobile facility such as a car. This is related to a mobile communication system that can be used.

[Conventional technology]

An example of a conventional mobile communication system is shown in FIG. 3 and explained as follows.
FIG. 3 is a block diagram showing an example of a relay system of a car telephone system.

In the figure, one MCI is a vehicle control exchange, one accommodates a communication line that can access a general telephone office (-intershell), and the other is provided corresponding to each route of multiple wireless base stations MBS1 to MBs. It accommodates a control channel C and normal communication channels S, -S, which are approach line groups.

Here, this control channel C is a channel for setting up a communication path with a mobile terminal (in some cases, it is separated into an access channel for outgoing calls and a paging channel for incoming calls), and is used between the wired section and the wireless section. They each have their own.

In the following, all solid lines are defined as wired sections, and dashed lines are defined as wireless sections. In addition, S is a communication channel (the above-mentioned normal communication channel in both directions), and each radio base station MB81 to M
The traffic is distributed according to the traffic in each BSn-compatible wireless zone, and the total is the communication channel MS in the wireless section.
S is a mobile terminal (hereinafter referred to as an on-board device).

Next, the operation shown in FIG. 3, which shows the relay system of this car telephone system, will be explained.

First, in the case of an incoming call from a general telephone station to the vehicle-mounted device MSS, the vehicle control exchange MCI uses the control channel C to pass the call to the called vehicle-mounted device M through the radio base stations MB81 to MBSn.
Paging the SS. And the called in-vehicle device M
When the SS is captured, the vehicle control exchange MCI selects one of the empty communication channels S of the optimum wireless base station MBS, and sets up a communication path between a wired section and a wireless section via the wireless base station MBS. Thereafter, the vehicle control exchange MCI sends a ringing signal to the on-board unit MSS through the communication channel.
If the called vehicle-mounted device MSS responds, a conversation can be made between the two parties.

Next, in the case of a call originating from the vehicle-mounted device MSS, the vehicle-mounted device MSS uses the control channel C to send a call signal to the vehicle control exchange MCE through the nearest wireless base station MBS. Then, this vehicle control exchange MCI receives it, selects one of the vacant communication channels S of the wireless base station MBS, and sets up a communication path between a wired section and a wireless section via the wireless base station MB8. Thereafter, the on-vehicle unit MSS sends the dialed number of the called party through the communication channel to the vehicle control exchange MCE.
makes a connection to the general office, and if the called party between the two shells answers, a conversation can take place between the two parties.

[Problem that the invention seeks to solve]

The car telephone system, which is representative of the mobile communication systems mentioned above, is a convenient means of communication as long as the subscriber is in a car, but once the subscriber leaves the car, depending on the location,
There is no longer a means of communication with unspecified subscribers.

An in-vehicle device that can be removed and carried has also been put into practical use, but there is a limit to its miniaturization as it is fundamentally different from an in-vehicle device. However, it does not have the mobility of a so-called pocket W or handheld transceiver.

On the other hand, if a portable paging device or the like is carried, it can function as a communication means for mobile subscribers, but interactive communication is not possible because of layer-wise communication.

[Means for solving problems]

In view of the above points, the present invention was made to solve such problems and eliminate such drawbacks, and its purpose is to provide an antenna system and a transmission/reception channel designation mechanism that is fundamentally different from that of the conventional one. It can be easily transitioned from a regular car phone system to a repeater for mobile phone services without any changes, and it can also use weak radio waves for transmission and requires a particularly sensitive mechanism for reception. To provide a mobile communication system in which the mechanism is extremely simple compared to an on-vehicle device because it allows only one-way communication at the same time, and the auxiliary transmitter/receiver can be made portable.

In order to achieve such an object, the mobile communication system of the present invention provides a normal communication channel in which a mobile terminal can randomly access a wireless base station, and a normal communication channel in which a mobile terminal can randomly access a auxiliary transceiver of the mobile terminal. The mobile terminal is provided with two backup communication channels each capable of transmitting or receiving at the same time, and when the mobile subscriber leaves the mobile facility in which the mobile terminal is installed, the mobile subscriber can use the auxiliary transceiver to carry the mobile terminal. The mobile terminal can be used as a relay to communicate with other subscribers.

[Effect]

In addition to the large number of regular communication channels that can randomly access radio base stations that are inherent in the on-vehicle device, a small number of backup communication channels that can only be accessed by the auxiliary transceiver must be expanded, so that the on-vehicle device is set to relay mode. If the send channel specifies one of the normal call channels, the receive channel specifies the protection call channel (
(The same applies vice versa). Therefore, in this case, the voice transmitted from the auxiliary transceiver is received by the vehicle-mounted device on the backup communication channel and transmitted to the wireless base station on the normal communication channel. In other words, the call is relayed by the in-vehicle device. Similarly, when transmitting a call to the auxiliary transceiver, the in-vehicle device receives it from the radio base station through the normal communication channel, relays it, and transmits it through the backup communication channel.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a mobile communication system according to the present invention, and shows an example of a relay system when the present invention is applied to a car telephone system.

In FIG. 1, the same reference numerals as in FIG. 3 indicate corresponding parts, and TR is an auxiliary transceiver that the subscriber carries when he moves out of the vehicle. There is also a control channel C between this auxiliary transceiver TR and the on-vehicle device MSS, but this is the same as the control channel C between the on-vehicle device MSS and the base radio station MSB, and the control channel Its purpose is distinguished by changing the flag. sA is a backup communication channel, and the vehicle-mounted device MSS has a small number of channels as an extension of the normal communication channel, and this extension channel is also provided corresponding to the auxiliary transceiver TH. Also,
A plurality of these backup communication channels sA are prepared for the same purpose and to enable simultaneous communication between the auxiliary transceiver TR and the on-vehicle unit M2S, but since the mutual communication is usually close to each other, from a traffic perspective, there are only a few That's fine.

Then, the radio waves transmitted by the auxiliary transceiver TR are transmitted from your own vehicle-mounted device M.
The radio waves may be weak enough to reach the S8, and the receiver may have sufficient performance to receive the weak electric field from the own vehicle-mounted device MSS.

In this way, the in-vehicle unit MSS has a relay mode switching function so that it can relay calls between the auxiliary transceiver TR and other subscribers. However, for the purpose of the present invention to make the auxiliary transceiver TR smaller and not to make any major changes to the on-vehicle unit MSS, the auxiliary transceiver TR
All calls are one-way calls (breath talk).

That is, in the case of an incoming call to the auxiliary transceiver TR, the receiver sets the normal call channel and the transmitter sets the standby call channel, and in the case of a call from the auxiliary transceiver TR, the receiver sets the standby call channel. channel.

The transmitters are normally set to each call channel,
It is configured to be controlled by the on-vehicle unit MSS and the auxiliary transceiver TR.

FIG. 2 is a block diagram showing the internal configuration and mutual relationship of the vehicle-mounted device MSS and the auxiliary transceiver TR in FIG. 1.

In FIG. 2, parts that are the same as those in FIG. 1 are given the same reference numerals and explanations will be omitted.

On the in-vehicle device MSS side, RX is the normal communication channel sR.
and receiver scanner RX-8C for control channel cR
The frequency is switched by N. This is an extension receiver for the backup communication channel provided as an extension of the receiver RX.
It is used for communication with the auxiliary transceiver TR. on the other hand,
TX, TX-SCN, and TX are each transmitter, transmitter scanner, and extended transmitter of the transmission system, and these are each receiver RX and receiver scanner RX of the above-mentioned reception system, respectively.
- corresponding to SCN and extended receiver RXA, respectively.

S6+81 is a switch showing the concept of the operation of the relay mode selector switch, and when the contacts of these switches SO+81 are in the state of broken lines, the receiver RX and transmitter TX are connected to the transmitter MIC and the receiver REC, respectively. It functions as a normal in-vehicle device, but when the contact is in the solid line state, it is configured to switch the circuit to switch to relay mode.

PATH and SW are call switching circuits (switches for confounding call paths), which are provided for confounding to direct calls on the normal call reception channel to the backup call transmission channel, or to guide calls on the backup call reception channel to the normal call transmission channel. There is. Further, C0NT is a logic control circuit for the entire vehicle-mounted device MSS.

On the other hand, on the side of the auxiliary transceiver TR, the TRX is a transmitter and a receiver for the protection channel and the control channel, and is configured to perform either transmitting or receiving operations at the same time. TRX/SW is the transmit/receive switch T/
This is a changeover switch circuit that controls switching of the transceiver TRX to transmission or reception using the R-SW. MIC is a transmitter, RFC is a receiver, and LOG is a logic control circuit for the entire auxiliary transceiver 'rR.

CR5Cτ is a reception channel and a transmission channel, respectively, of the control channel seen from the on-vehicle device M2S side, and is set as the same frequency for the on-vehicle device MSS and the auxiliary transceiver TR. Similarly, Syt + 87 is a receiving channel and a transmitting channel of the normal communication channel as seen from the in-vehicle device MSs side. Further, SAR and SAT are the reception channel and transmission channel of the backup communication channel as seen from the Yabari vehicle-mounted device MSS side.

Next, the operation of the mobile communication system according to the present invention will be explained with reference to FIGS. 1 and 2.

In the present invention, since the on-vehicle device MSS is switched to the relay mode, the following operations have different functions even if the signal is the same type as the normal operation for the on-vehicle device MSS by flag control of the control signal. So, identify and control.

First, a case in which a call is received from the telephone to the on-vehicle MSS will be explained.

In this case, as explained above with reference to FIG. 3, paging is performed on the called vehicle-mounted device MSS. The called vehicle-mounted device MSS uses a control channel (the receiving system uses a receiving channel CR).
I receiver RX, receiver scanner RX/SCN, transmission system is transmission channel CT, transmitter TX.

The in-vehicle unit MS is controlled by the transmitter scanner TX-8CN).
S is activated and transmits a paging response signal with a changed flag on the transmission channel cT, which is sent to the wireless base station MBS.
, is viewed from above the motor vehicle control exchange MC and serves as a paging signal for the auxiliary transceiver TH.

On the other hand, the vehicle control exchange MCI is the optimal wireless base station MBS.
One of the empty communication channels (normal communication channel S or reception channel SR+transmission channel ST of the normal communication channel) is selected to set a communication path between the vehicle-mounted device MSS and the calling party. The automatic control exchange MCE then transfers the ringing signal to the communication channel (receiver RX).

It is sent to the on-vehicle device MSS through the reception channel SR).

Then, the on-vehicle 1M8s switches again to the control channel C and relays the ringing tone signal to the auxiliary transceiver TR through the path of the receiving channel CR2 transceiver TRX shown in FIG. The auxiliary transceiver TR waiting on the control channel C is called, and when the person carrying the auxiliary transceiver TR responds, the auxiliary transceiver TR switches the control channel to the transceiver TRX by the changeover switch circuit TRX-SW shown in FIG. - Switch to the transmission channel CT route transmission and return the subscriber response signal to the onboard unit MSS. Then, the in-vehicle unit MSS identifies this, returns it to the normal communication channel, and transmits the subscriber response signal with the flag changed to the wireless base station MBS and the upper side of the vehicle control exchange MC. Prior to this, using well-known electric field discrimination control, the on-vehicle unit MSS activates one of the transmission channels Sh of empty backup communication channels between it and the auxiliary transceiver TR. Since the transmitting side (transmission channel ST) of the normal communication channel facing the MBS side is switched, it is temporarily in a paused state.

In this way, the effective communication path immediately after the subscriber response in the auxiliary transceiver TR is: Receive channel sR - Receiver RX - Receiver scanner RX -
8CN-Switch So (break)-Call path switching circuit P
ATHSW - switch St (break) - transmitter scanner TX-8CN - extended transmitter TXA - transmission channel 5AT - transceiver TRX - logic control circuit LOG - handset RFC. During this time, the transmission channel sT corresponding to the reception channel sR of the normal communication channel is temporarily suspended, and a one-way communication is established.

Next, when the subscriber on the side of the auxiliary transceiver TR transmits, by switching the transmission/reception selector switch T/RSW, for example, the auxiliary transceiver TR directs the signal from the auxiliary transceiver TR to the in-vehicle unit MSS. There is a method of transmitting a switching code using an independent weak radio wave, but illustration thereof is omitted.

Then, the logic circuit C0NT of the onboard unit MSS identifies this signal and turns on the temporarily suspended transmission channel sT to the wireless base station MBS side, and the auxiliary transceiver TR also autonomously transmits the backup communication channel. Channel S
Activate the receive channel SAR corresponding to the AT. Therefore, the effective communication path after switching between transmitter and receiver is: transmitter MIC - logic circuit LOG - transceiver TRX -
Reception channel 5AR - Extension receiver RXA - Receiver scanner RX @5CN - Switch So (break) - Communication path switching circuit PATHSW - Switch S, (break) - Transmitter scanner TX/5CN - Transmitter TX - Transmission channel ST It becomes a route.

Next, a case where a call is made from the auxiliary transceiver TR via the on-vehicle unit MSS will be explained.

In this case, the auxiliary transceiver TR uses the reception channel cR of the control channel to transmit information to the onboard unit MSS in the standby state.
When the vehicle-mounted device MSS identifies this, it changes the flag and sends the call signal to the radio base station MBS and vehicle control exchange MCG using the transmission channel cT.

Then, in the same way as in the case of an incoming call, when the transmission channel ST and reception channel sR of the normal communication channel are set between the on-vehicle device MSS and the vehicle control exchange MCE, this on-vehicle device MSS is connected to the auxiliary transceiver TR and the on-vehicle device Set up one of the transmission channels SAT of the empty spare traffic channel between M2S and activate this transmitter, ie the extended transmitter TXA.

In this way, as in the case of an incoming call described above, the handset R
FC - Logic circuit LOG - Transmitter/receiver TRX - Transmission channel 5AT of backup communication channel - Extension receiver TXA - Transmitter scanner TX/5CN - Switch S1 (break) - Communication path switching circuit PATH8W - Switch So (
Break) - Receiver Scanner RX-8CN - Receiver RX
- Monitor the path of the receiving channel sR of the normal communication channel until the other called party answers.

When the called party answers, the auxiliary transceiver T
R switches the transmit/receive changeover switch T/RSW, and as in the case of an incoming call described above, transmitter MIC - logic circuit LOG - transceiver TRX -
Receiving channel 5AR of backup communication channel - extended receiver R
XA-Receiver Scanner RX/5CN-Switch So
(Break) - Communication path switching circuit PATHff - Switch S! (Break) - Create a transmission communication path along the route of transmitter scanner TX-8CN - transmitter TX - transmission channel sT of the normal communication channel.

In this way, the present invention extends a small number of backup communication channels that can only be accessed to the auxiliary transceiver TR, in addition to a large number of normal communication channels that can be randomly accessed to the radio base station BBS, which are originally provided in the on-vehicle unit MSS. Therefore, when the in-vehicle MSS is set to relay mode, when the transmission channel specifies one of the normal communication channels, the reception channel specifies the backup communication channel (the same applies in the reverse case). ). Therefore, in this case, the voice transmitted from the auxiliary transceiver TR is received by the in-vehicle unit MSS on the backup communication channel, and is received by the radio base station M on the normal communication channel.
Sent to BS. That is, the call is relayed by the vehicle-mounted device MSS. Similarly, when transmitting a call to the auxiliary transceiver TR, the in-vehicle unit MSS transmits a call to the wireless base station M using the normal call channel.
It is received from the BS, relayed, and transmitted on a protection communication channel.

〔Effect of the invention〕

As explained above, according to the present invention, the transmitter and receiver of the vehicle-mounted device each operate only on one channel, so the antenna system and the transmission and reception channel designation mechanism are fundamentally changed from the conventional ones. By adding a mode switching means, it is possible to easily transition from a normal car phone system to a repeater for mobile phone service. Because it is a wireless base station, it can use weak radio waves for transmission, does not have particularly high sensitivity functions for reception, and only allows one-way calls (breath talk) at the same time.
The mechanism is extremely simple compared to the vehicle-mounted MSS, and the auxiliary transmitter/receiver can be made portable, so the practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the mobile communication system according to the present invention, FIG. 2 is a block diagram showing a configuration example and mutual relationship of the on-vehicle device and the auxiliary transceiver in FIG. 1, and FIG.
The figure is a block diagram showing an example of a conventional mobile communication system. MSS...In-vehicle device (mobile terminal), MSB, ~MS
Bn...Radio base station, MCI...Car control exchange, TR...Auxiliary transceiver, sR, sT@@@@@
Normal call channel SA I SARI SA Ding...
・・Preliminary communication channel, C+C*+CT・・・Control channel.

Claims (1)

[Claims] In a mobile communication system in which a general communication network can be accessed through a mobile terminal, a radio base station, and a mobile control exchange, a normal communication channel that allows random access to the radio base station from the mobile terminal; The mobile terminal is provided with a standby communication channel that allows random access to the auxiliary transceiver of the mobile terminal so that each channel can transmit or receive at the same time, and when the mobile subscriber leaves the mobile facility in which the mobile terminal is installed. . A mobile communication system, characterized in that the portable auxiliary transmitter/receiver relays the mobile terminal to communicate with other subscribers.