JPH0555992A - Private branch for exchange - Google Patents

Abstract

PURPOSE:To relieve the load of the exchange used for revising position information of a radio telephone set by revising a radio zone when the intensity of a notice signal is reduced more than a preset reference value. CONSTITUTION:Plural radio equipments 14-1, 14-2, 14-3 output a notice signal through line circuits 13-1, 13-2, 13-3 connecting to a channel 10 in a radio wave. A storage section 12 stores radio zones 15-1, 15-2, 15-3 belonging to each radio equipment depending on the intensity of the notice signal received from the radio equipments 14. For example, when the intensity of the notice signal of the radio equipment 14-1 is lower than a reference level and the intensity of the notice signal of the radio equipment 14-2 is higher than the reference level, a control section 11 changes the radio zone 15-1 into the radio zone 15-2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange, and more particularly to a private branch exchange that identifies a wireless area to which a connected wireless telephone belongs.

[0002]

2. Description of the Related Art In a conventional private branch exchange, in order to determine the wireless area to which a wireless telephone to be connected belongs, a wireless device receives a notification signal from a plurality of adjacent wireless devices, and the strongest notification signal is issued. The wireless telephone belongs to the wireless area of the existing wireless device.

[0003]

In this conventional private branch exchange, the data is stored when the wireless devices which emit the strongest notification signal change one after another in a short time and the wireless area to which the wireless telephone belongs changes one after another. There is a problem in that the load must be increased because the position information of the memory must be changed one after another.

[0004]

The private branch exchange of the present invention comprises:
In a wireless telephone that stores in a storage unit a wireless area to which a plurality of wireless devices that output a notification signal from a line circuit connected to a communication path by radio waves and the strength of the received notification signal are stored in a storage unit, the strength of the notification signal Is changed from a preset reference value, the wireless area is changed.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining the operation of the present embodiment.

In FIG. 1, a plurality of wireless devices 14-1,
14-2 and 14-3 output the notification signals from the line circuits 13-1, 13-2 and 13-3 connected to the communication path 10 by radio waves. Depending on the strength of the notification signal received from the wireless device 14, the wireless area 15-1, 15-2, 15 to which it belongs
-3 is stored in the storage unit 12 and the control unit 11 is caused to change the wireless area when the strength of the notification signal received by the wireless telephone 16 is lower than a preset reference value.

Next, the operation of this embodiment will be described with reference to FIGS.

It is assumed that the wireless telephone 16 is moving from the wireless area 15-1 belonging to the wireless area 15-1 to the wireless area 15-2 and is currently located in the wireless area 15-4. Wireless telephone 16
2 receives the notification signal from the wireless device 14 and measures the strength, the notification signal strength of the wireless devices 14-1 and 14-2 shown in FIG. As such, it does not change the wireless area to which it belongs.

It is assumed that the wireless telephone 16 further moves and is located in the wireless area 15-2 beyond the wireless area 15-4. When the wireless telephone 16 receives the notification signal from the wireless device 14 and measures the strength, the wireless device 1 shown in FIG.
Since the strength of the notification signal 4-1 is between a and b and the strength of the notification signal of the wireless device 14-2 is a or higher,
As shown in FIG.
Is changed to.

When the wireless telephone 16 moves from the state where it belongs to the wireless area 15-2, the strength of the notification signal from the wireless device 14 is the reference value as shown in FIG. 3C. When the strength of the annunciation signals of the wireless devices 14-1 and 14-3 is b or less and b or more, the belonging wireless area is changed from 15-2 to 15-3 as shown in FIG.

[0011]

As described above, according to the present invention, the wireless area to which the wireless signal belongs from the plurality of wireless devices which output the notification signal from the line circuit connected to the communication path by the radio wave is stored. By changing the wireless area when the strength of the annunciation signal in the wireless telephone stored in the unit drops below a preset reference value, it is not necessary to change the wireless telephone location information one after another, and the load on the exchange can be reduced. There is an effect.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the present embodiment.

FIG. 3 is a diagram for explaining the operation of the present embodiment.

[Explanation of symbols]

 10 Call Path 11 Control Unit 12 Storage Unit 13-1, 13-2, 13-3 Line Circuit 14-1, 14-2, 14-3 Wireless Device 16 Wireless Telephone

Claims (1)

[Claims] 1. A plurality of wireless devices that output a notification signal from a line circuit connected to a communication path by radio waves and a wireless telephone that stores a wireless area to which the wireless device belongs according to the strength of the received notification signal in a storage unit. A private branch exchange, wherein the wireless area is changed when the strength of the notification signal falls below a preset reference value.