JPH0833038A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To provide a cordless telephone system of a radio channel switching system with no speech interruption by providing speech path switching devices for switching the speech path of two counter radio equipments at a base unit and a hand set. CONSTITUTION:A radio equipment 14 of a base unit 1 reports the reception of an outgoing speech channel switching request response signal from a hand set 2 to a microprocessor 12. The microprocessor 12 passes a voice signal from a trunk line interface 11 to a radio equipment 15 as well while controlling a speech path switching device 13, transmits that signal through an outgoing speech channel 5k while controlling the radio equipment 15 and stops the transmission of the voice signal from the radio equipment 14 after the lapse of fixed time. When the reception level of the outgoing speech channel 5k gets higher than that of an outgoing speech channel 5j, a microprocessor 22 of the hand set 2 switches the voice signal to be transmitted to a speech circuit from a radio equipment 24 to a radio equipment 25 by controlling a speech path switching device 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone device, and more particularly to a wireless channel switching system.

[0002]

2. Description of the Related Art In a conventional wireless channel switching type cordless telephone apparatus, since a wireless channel is switched by a pair of wireless apparatuses, a call is interrupted when the wireless channel is switched.

The following are examples of conventional wireless channel switching methods or cordless telephone system technologies.

(1) A channel group is formed by a wireless channel used for a call between a mobile unit and a wireless base station and at least one unused wireless channel, and the channel group is formed based on the frequencies of the channels forming the channel group. A radio channel switching method for improving the confidentiality of a call by switching the frequency of a radio channel used in a call between a mobile unit and a radio base station at regular intervals (Japanese Patent Laid-Open No. 1-126026).

(2) The entire wireless communication service area is divided into a plurality of small wireless zones, a plurality of frequencies are assigned to each small wireless zone, and the mobile stations and the small wireless zones are respectively assigned using the frequencies. A radio channel switching method for mobile communication for making a call between established radio base stations,
A wireless channel switching method (Japanese Patent Application Laid-Open No. 63-215230) for switching the frequency of a wireless channel used in a call between a mobile unit and a wireless base station at regular intervals to improve the confidentiality of the call.

(3) When it is detected that co-channel interference has occurred on the cordless telephone side, by issuing a channel switching request to a plurality of fixed devices,
A cordless telephone system in which a fixed device and a cordless telephone start a channel scan from a random channel and perform a transmission operation on a new channel without interference (Japanese Patent Laid-Open No. 62-62160).
-66731).

[0007]

The conventional wireless channel switching type cordless telephone device has a drawback that a call is interrupted when the wireless channel is switched.

Therefore, the present invention is intended to improve the drawbacks of the conventional cordless telephone system of the radio channel switching system so that the call is not interrupted when the radio channel is switched.

[0009]

In order to solve the above-mentioned problems, the present invention provides a cordless telephone apparatus of a system which comprises a master unit and a slave unit each having a plurality of wireless channels and switches the wireless channels during a call. A pair of opposite wireless devices and a call path switching device for switching the call path of the pair of opposite wireless devices in the device and the slave, while forming a call path using a wireless channel in the pair of opposite wireless devices, A procedure for connecting a wireless path of another wireless channel is performed by another pair of opposite wireless devices, and a pair of opposite wireless devices currently forming a call path by the call path switching device and another pair of opposite wireless devices. Switch the call path instantaneously to switch the wireless channel without interrupting the call. Constituting the cordless telephone system controlled by processor.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.

First, the configuration of one embodiment of the present invention will be described. The cordless telephone device comprises a master unit 1 and a slave unit 2.
These are connected by the wireless channel group 3.

The radio channel group 3 includes a plurality of control channels 4n (n = 1, 2, 3, ...) And a plurality of call channels 5.
n (n = 1, 2, 3, ...). The control channels include an uplink control channel sent from the handset 2 to the base unit 1 and a downlink control channel sent from the base unit 1 to the handset 2. The call channels include an uplink call channel sent from the handset 2 to the base unit 1 and a downlink call channel sent from the base unit 1 to the handset 2. It should be noted that arbitrary channels of the control channels are control channels 4h and 4i, and arbitrary channels of the call channels are call channels 5h, 5i, 5j, and 5k.

The microprocessor 12 of the base unit 1 controls the office line interface 11, the call path switching device 13, the wireless device 14, and the wireless device 15. Station line interface 1
1 is connected to the office line 6 and the call path switching device 13, and the call path switching device 13 is connected to the wireless device 14 and the wireless device 15.

The microprocessor 22 of the slave unit 2 controls the call circuit 21, the call path switching device 23, the wireless device 24, and the wireless device 25. The call path switching device 23 is connected to the call circuit 21, the wireless device 24, and the wireless device 25.

The wireless device 14 and the wireless device 15 of the base unit 1
Is connected to the wireless device 24 and the wireless device 25 of the handset 2 via the control channel 4n and the call channel 5n in the wireless channel group 3.

Next, the operation of the embodiment of the present invention will be described. The wireless device 14 of the master device 1 and the wireless device 24 of the slave device 2 are
A call path is formed by using the uplink call channel 5h and the downlink call channel 5j of the wireless channel group 3. The operation of switching the wireless channel in this state is shown below.

The microprocessor 12 of the base unit 1 controls the wireless device 15 to transmit the carrier sense request signal to the handset unit 2 using the control channel 4i.

The wireless device 25 of the handset 2 informs the microprocessor 22 that the carrier sense request signal from the base unit 1 has been received. The microprocessor 22 controls the wireless device 25 to search for an idle downlink call channel, and the idle device 25 transmits the idle downlink call channel information to the base unit 1 using the control channel 4h.

The radio unit 15 of the master unit 1 notifies the microprocessor 12 of the idle downlink communication channel information from the slave unit 2. The microprocessor 12 controls the wireless device 15 to search for an empty upstream communication channel, determines an upstream communication channel and a downstream communication channel to be used, and determines the wireless device 15
And transmits the call channel information to be used to the slave unit 2. The upstream call channel is 5i and the downstream call channel is 5k.

The wireless device 25 of the handset 2 notifies the microprocessor 22 of the call channel information from the base unit 1.
The microprocessor 22 controls the wireless device 25,
The base unit 1 transmits an upstream call channel switching notification.

The radio unit 15 of the master unit 1 notifies the microprocessor 12 of the upstream call channel switching notification from the slave unit 2. The microprocessor 12 controls the wireless device 15 to transmit an upstream call channel switching response signal to the slave unit 2. In addition, the uplink communication channel 5 used by the wireless device 15
The reception of i is started, and the reception level thereof is compared with the reception level of the upstream communication channel 5h received by the wireless device 14.

The wireless device 25 of the handset 2 receives the upstream call channel switching response signal from the base unit 1 by the microprocessor 22.
To notify. The microprocessor 22 controls the call path switching device 23 to pass the voice signal from the call circuit 21 to the wireless device 25, and controls the wireless device 25 to transmit on the call channel 5i. Stop sending audio signals.

When the reception level of the upstream call channel 5i becomes higher than that of the call channel 5h, the microprocessor 12 of the master unit 1 controls the call path switching device 13 to send a signal to the office line from the wireless device 14 to the wireless device 15. Switch to.

The following downlink communication channel switching operation is also performed in parallel with the above-mentioned uplink communication channel switching operation.

The microprocessor 12 of the base unit 1 controls the radio unit 15 to transmit the downlink call channel switching request to the handset 2 using the control channel 4i.

The wireless device 25 of the slave unit 2 notifies the microprocessor 22 that the downlink call channel switching request from the master unit 1 has been received.

The microprocessor 22 includes a wireless device 24.
And transmits a downlink communication channel switching request response to the base unit 1 through the control channel 4h. Also, the wireless device 25 starts receiving the downlink communication channel 5k, and the reception level and
The comparison of the reception levels of the downlink communication channel 5j received by the wireless device 24 is started.

The radio unit 14 of the master unit 1 notifies the microprocessor 12 that the downlink call channel switching request response signal from the slave unit 2 has been received. Microprocessor 1
2 controls the call path switching device 13, passes the voice signal from the office line interface 11 to the wireless device 15, controls the wireless device 15, and transmits on the downlink call channel 5k.
After a certain period of time, the wireless device 14 stops transmitting the audio signal.

The microprocessor 22 of the slave unit determines that the reception level of the downlink communication channel 5k is the downlink communication channel 5j.
When it becomes higher, the voice path switching device 23 is controlled to switch the voice signal sent to the voice communication circuit from the wireless device 24 to the wireless device 25.

[0030]

As described above, according to the present invention, in a cordless telephone device having a wireless channel switching function, two pairs of wireless devices and a call path switching device for switching the call channel of each wireless device are installed. Thus, it is possible to realize a cordless telephone device of a wireless channel switching system that does not cause interruptions in communication.

[Brief description of drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 base unit 11 office line interface 12 microprocessor 13 call path switching device 14 wireless device 15 wireless device 2 handset 21 calling circuit 22 microprocessor 23 call path switching device 24 wireless device 25 wireless device 3 wireless channel group 4n control channel (n = 1,2,3, ...) 5n call channel (n = 1,2,3, ...) 6 station line

Claims (2)

[Claims] 1. A cordless telephone apparatus of a type which comprises a master unit and a slave unit each having a plurality of wireless channels and switches wireless channels during a call, and two pairs of opposite wireless devices and two pairs of the master unit and the slave unit. The call path switching device that switches the call path of the opposite wireless device of, while forming the call path using the wireless channel in the pair of opposite wireless devices,
A procedure for connecting a wireless path of another wireless channel is performed by another pair of opposite wireless devices, and a pair of opposite wireless devices currently forming a call path by the call path switching device and another pair of opposite wireless devices. A cordless telephone device characterized in that a wireless channel is switched without interrupting a call by instantaneously switching a call path with. 2. The cordless telephone device according to claim 1, wherein the opposite wireless device and the call path switching device of the master unit and the slave unit are respectively controlled by a microprocessor.