JPH0344119A - Mobile radio communication equipment - Google Patents

Abstract

PURPOSE:To attain exchange of tracing by generating a switching request signal from a mobile equipment when an input level of a radio wave from a base station lowers by a prescribed value or over, detecting a detection data corresponding to an input level at the base station and controlling a switch unit based on the detection data. CONSTITUTION:A mobile equipment 10 supervises an input level of a radio wave from base stations 9a-9c by a level supervisory circuit 26, and when the decrease in the input level by a prescribed level or over is detected by the level supervisory circuit 26, a switching request signal is generated from a switch request circuit 27 to request the changeover to other base station. The base stations 9a-9c sends a detection data from a data transmission circuit 37 to a signal deciding circuit 12 in response to an input level of the switching request signal detected by a detection circuit 36, the circuit 12 generates a switching signal based on the detection data to control a switch unit 1 with the switching signal, thereby switching the connection of talking. Thus, the exchange by tracing is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mobile radio communication device that performs tracking and exchange of mobile devices moving within a service area formed by a plurality of zones.

[Prior Art] FIG. 6 is a system diagram showing a conventional mobile radio communication device disclosed in, for example, Japanese Patent Publication No. 62-62097. In the figure, 1 is a switch unit that switches connection of a call, and 2a to 2c are two-way trunks connected to this switch unit 1. 3 is a base station controller to which these mobile bidirectional trunks 2a to 2C are connected, and 4 is a base station controller S that determines the S/N ratio of the signal from this base station controller 3 and sends the determination result to the switch unit l. /N determination circuit.

5a to 5C are base stations each equipped with a plurality of radios and connected to the mobile bidirectional trunks 2a to 2C;
Numerals 6a to 6C indicate zones in which radio waves from each of these base stations 5a to 5C can reach, and 7 indicates a service area formed by each of these zones. Reference numeral 8 denotes a mobile device that moves within the service area 7, connects wirelessly to the nearest base stations 5a to 5C, and makes calls via the switch unit 1.

Next, the operation will be explained. Radio waves from a mobile device 8 moving within a certain zone, for example zone 6b, are received by the radio of the base station 5b, sent to the mobile-to-mobile bidirectional trunk 2b, and sent to the communication partner via the switch unit l. Here, when mobile device B moves from zone 6b to zone 6a, the S of the radio wave received by the radio device of base station 5b
/N ratio is the S/N ratio of the radio wave received by the radio of the base station 5a.
It becomes worse than the N ratio. S of each base station 5a to 5C
The /N information is sent together with the mobile unit code of the mobile unit 8 to the corresponding mobile-to-mobile bidirectional trunks 28 to 2C, and is input to the S/N determination circuit 4 via the base station controller 3.

The S/S determination circuit 4 selects each base station 5 based on the mobile station code.
As a result of comparing the S/N information from a to 5C, the base station code of the base station with the best S/N ratio (base station 5a in this case) is sent to the switch unit l. In accordance with this base station code, the switch unit 1 switches the call of the mobile Ja8, which was connected to the base station 5b via the mobile-to-mobile bidirectional trunk 2b, to the call via the mobile-to-mobile bidirectional trunk 2a via the base station 5a.

[Problem to be solved by the invention]

Since the conventional mobile radio communication device is configured as described above, it is necessary to equip the base stations 5a to 5c with a plurality of radio devices and constantly wait for radio waves from the mobile device 8.
There were problems such as the equipment became expensive and the number of channels used increased.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a mobile radio communication device that is inexpensive and can limit the number of channels used.

[Means to solve the problem]

A mobile radio communication device according to the present invention includes a level monitoring circuit that monitors the input level of radio waves from a base station to a mobile device;
A switching request circuit that generates a switching request signal when the level monitoring circuit detects that the input level has decreased to a predetermined level or more is provided, and each base station includes a detection circuit that detects the input level of the switching request signal, and a detection circuit that detects the input level of the switching request signal. It is equipped with a data sending circuit that sends out detection data corresponding to the detection result of the circuit, and a signal determination circuit that outputs a switching signal to the switch unit in accordance with the detection data received from the data sending circuit of the base station.

[For production]

In the mobile radio communication device according to the present invention, the mobile device monitors the input level of radio waves from the base station by a level monitoring circuit, and when the level monitoring circuit detects a decrease in the input level by a predetermined level or more, a switching request is made. A switching request signal is generated from the circuit to request switching to another base station, and the base station transmits the detected data from the data sending circuit to the signal judgment circuit in response to the input level of the switching request signal detected by the detection circuit. The sending and signal determining circuit generates a switching signal based on this detection data, and this switching signal controls the switch unit to switch the call connection, thereby realizing tracking exchange.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, ■ is a switch unit equivalent to a conventional one, 9a to 9c are base stations that are different from conventional ones in that they are equipped with only one radio device that can switch multiple channels, and 6a to 6c are base stations These are the zones of each of these base stations 9a to 9c.

10#- is a mobile device that moves within the service area formed by each of these zones 6a to 6c, and is connected to base stations 9a to 9c.
This differs from conventional ones in that it has a function of detecting the input level of radio waves from the radio and transmitting a switching request when a drop in the level is detected. 11 is each base station 9a~
A signal synthesis circuit 12 is connected to the signal synthesis circuit 9c, and 12 sends a connection switching signal to the switch unit 1 according to the detection data from the signal synthesis circuit 11, and also sends a connection switching signal to each base station 9a to 9c.
This is a signal determination circuit that sends various signals for switching calls to the mobile device 9c and the mobile device 10.

FIG. 2 is a block diagram showing the configuration of the mobile device IO. In the figure, 21 is a transmitting circuit, 22 is a receiving circuit, 23
is an antenna; 24 is a frequency synthesizer that provides channel frequencies to the transmitting circuit 21 and the receiving circuit 22;
Reference numeral 5 denotes an antenna switcher for switching connections between the antenna 23 and the transmitting circuit 21 and receiving circuit 22. 26 is a level monitoring circuit that is connected to the receiving circuit 22 and monitors the input level of the received radio wave, and 27 is a level monitoring circuit that is connected to the receiving circuit 22 and monitors the input level of the received radio wave, and 27 is a level monitoring circuit that is connected to the receiving circuit 22 and monitors the input level of the received radio wave. This is a switching request circuit that generates a switching request signal requesting switching to a base station.

FIG. 3 is a block diagram showing the configuration of the base stations 9a to 9C. In the figure, 3I is a transmitting circuit, 32 is a receiving circuit, 33 is an antenna, 374 is a frequency synthesizer that provides a channel frequency to the transmitting circuit 31 and the receiving circuit 32, and 35 is a frequency synthesizer that provides a channel frequency to the transmitting circuit 31 and the receiving circuit 32 to the antenna 33. This is an antenna switch that switches connections. 3
6 is a detection circuit that detects the input level of the switching request signal from the switching request circuit 27 of the mobile device 10 received by the receiving circuit 32, and 37 is a timing determined according to the detection level of this detection circuit 36. This is a data sending circuit that sends out detected data. 38 is a high frit circuit connected to the transmitting circuit 31 and the receiving circuit 32, and 39 is a high frit circuit connected to the hybrid circuit 38 and the data sending circuit 37.

Next, the operation will be explained. Here, FIG. 4 is a sequence diagram for explaining the operation.

A mobile 610 located in zone 6b is connected to switch unit 1 via base station 9b to make a call. The communication channel at this time is assumed to be Sl. Next, when the mobile device IO moves to the zone 6a of the base station 9a, the reception level of the radio waves received by the receiving circuit 22 from the base station 9b decreases. Here, in the mobile device 10, the level monitoring circuit 26 monitors the input level output from the receiving circuit 22 during a call. When the level monitoring circuit 36 detects a decrease in the input level beyond a predetermined level, the switching request circuit 27
Switching request circuit 2 receives the signal and sends a signal to
7 generates a switching request signal requesting switching of the currently connected base station 9b to another base station 9a or 9c, and sends it to the transmitting circuit 21. The transmitting circuit 21 switches the channel from the channel S1, which is currently in use, to another predetermined channel C, and transmits the switching request signal. This channel switching is performed by the frequency synthesizer 24.

Furthermore, the base stations 9a and 9c that are not communicating with the mobile device IO are waiting on this predetermined channel C. Therefore, mobile IO is channel C
The switching request signal transmitted by the base stations 9a and 9c is received by the receiving circuits 32 of the base stations 9a and 9c, and the input level output from the receiving circuits 32 is detected by the detection circuit 36 and sent to the data sending circuit 37. Data sending circuit 3 that receives it
7 generates detection data and outputs it via the hybrid circuit 39 at a predetermined timing corresponding to the input level received from the detection circuit 36. Here, this detection data is output at a faster rate as the received input level is higher.

The detection data output from the data sending circuit 37 is sent to the signal synthesizing circuit 11, and transferred from the signal synthesizing circuit 11 to the signal determining circuit 12. The higher the input level, the earlier this detection data is output, so the base station 9
The signal from the base station 9a reaches the signal determination circuit 12 earlier than the signal from the base station 9a. When the signal determination circuit 12 receives this detection data, it sends a switching signal to the switch unit I to switch the call connection to the base station 9a. Further, this signal determination circuit 12 further sends a signal to each of the base stations 9a to 9c to switch the call connection to the base station 9a, and continues to send the base station 9a to the base station 9a that has been switched to the mobile device IO. Sends out a signal indicating the other station code and the new channel for the call.

Upon receiving this signal, the mobile device 10 recognizes that the call connection has been switched to the new base station 9a, and uses the frequency synthesizer 24 to change the settings of the transmitting circuit 21 and receiving circuit 22 to the new channel. This allows the call to continue via the new base station 9a. Furthermore, base stations 9b and 9C return to channel C and prepare for generation of the next switching request signal.

In the above embodiment, the tracking exchange is controlled based on the timing of sending detection data from the data sending circuit 37 of the base stations 9a to 9C. Data polling may also be performed. FIG. 5 is a sequence diagram showing the operation of such an embodiment. The signal determination circuit 12 periodically performs polling, and the base stations 9a to 9c that have received the switching request signal from the mobile device 1O respond to it and return detection data. In this case, the detection data is for each base station 9a to 9c.
The signal determination circuit 12 supplies the switching signal generated based on the input level value to the switch unit l.

〔Effect of the invention〕

As described above, according to the present invention, when the input level of radio waves from a base station drops to a predetermined level or more, a switching request signal is generated from a mobile device, and the base station receives this switching request signal and inputs the switching request signal. Since detection data corresponding to the level is sent out and the switch unit is controlled by a switching signal generated by a signal judgment circuit based on this detection data, a request for tracking exchange can be made from the mobile device side. This has the effect of providing a mobile radio communication device that can reduce the device cost and limit the channels used.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a mobile radio communication device according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a mobile device in this embodiment, and FIG. 3 is a block diagram showing the configuration of a base station in this embodiment. 4 is a sequence diagram for explaining the operation of this embodiment, FIG. 5 is a sequence diagram for explaining the operation of another embodiment of the present invention, and FIG. 6 is a conventional mobile radio. It is a system diagram showing a communication device. ■ is a switch unit, 6a to 6c are zones, 7 is a service area, 9a to 9c are base stations, IO is a mobile device, 12
26 is a signal judgment circuit, 26 is a level monitoring circuit, 27 is a switching request circuit, 36 is a detection circuit, and 37 is a data sending circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a switch unit; a plurality of base stations connected to the switch unit, each having a predetermined zone; and a plurality of mobile devices that move within a service area formed by a set of the zones; In a mobile radio communication device that connects a call to the nearest base station by switching with the switch unit when moving within the service area, the input level of radio waves from the base station is set to the mobile device. and a switching request circuit that generates a switching request signal requesting switching to another base station when the level monitoring circuit detects a decrease in the input level by a predetermined level or more. , each base station is provided with a detection circuit that detects the input level of a switching request signal from the mobile device, and a data transmission circuit that transmits detection data corresponding to the detection result of the detection circuit; Based on the detection data received from the data transmission circuit of the station,
A mobile radio communication device comprising a signal determination circuit that outputs a switching signal for switching a call connection to the switch unit.