JPH0474029A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To preclude the possibility of collision of outgoing calls or incoming calls even under the environment where plural cordless telephone systems are used simultaneously by discriminating outgoing and incoming idle channels via 1st and 2nd reception circuits respectively. CONSTITUTION:A station incoming signal from a telephone line incoming to a speech circuit 10 is informed to a control circuit 4 and an outgoing radio circuit connection operation addressed to a mobile station 2 from a base station 1 is started. At first a 1st radio reception circuit 6 applies idle channel discrimination to detect the intensity of a radio wave to a radio circuit 3 inputted from an antenna 13 and when the check of an idle channel in the incoming line of a reception frequency of a base station 1 is not detected, a 2nd radio reception section 19 is operated and an idle outgoing line of a transmission frequency of the base station 1 is checked. Then an idle control channel as to both incoming and outgoing frequencies for the line 3 is discriminated. On the other hand, the processing above is similar to the mobile station 2 and collision of incoming and outgoing calls is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cordless telephone device consisting of a base station connected to a telephone line and a mobile station wirelessly connected to the base station, and particularly relates to an empty channel determination operation thereof. It is related to.

Prior Art FIG. 2 shows the configuration of a conventional cordless telephone device. In Fig. 2, ■ is a base station, 2 is a mobile station, 3 is a wireless line connecting these, 4 is a base station control circuit, 5 is a mobile station control circuit, 6 is a base station wireless reception circuit, and 7 is a A wireless receiving circuit of the mobile station, 8 a wireless transmitting circuit of the base station, 9 a wireless transmitting circuit of the mobile station, 10 a communication circuit, 11 a receiver amplifier of the mobile station, 12 a microphone amplifier of the mobile station, 13
．． 14 are the antennas of base station 1 and mobile station 2, respectively; 15
1 is a call button to be pressed when calling the mobile station 2 from the base station 1, 16 is a receiver, 17 is a microphone, and 18 is an operation button of the mobile station.

Next, the operation of the conventional example will be explained. When the call circuit 10 of the base station 1 receives an incoming signal from the telephone line,
This is notified to the control circuit 4, and the mobile station 2 is placed in the central office line receiving operation via the radio line 3. At this time, when performing the operation of connecting the wireless line 3 from the base station 1 to the mobile station 2, the wireless receiving circuit 6 of the base station 1 is activated to determine whether the control channel to be sent out first is available and the electric field detection signal CDI is used. This is done depending on the level of If the control channel is determined to be empty, the radio transmitting circuit 8 is activated to transmit radio waves to the radio line 3, and the radio receiving circuit 7 sends control data to the control circuit 5. The operation shifts to receiving a call from the telephone line.

Similarly, when the operator presses the operation buttons 18 of the mobile station 2 to initiate a call, the mobile station 2 receives wireless information to determine whether the control channel to be transmitted is free before transmitting radio waves. Only when the circuit 7 is activated and the electric field detection signal CDI determines that it is vacant, the wireless transmission circuit 9 is activated to form the wireless line 3, and the wireless line 3 is connected to the control circuit 4 via the wireless reception circuit 6 of the base station 1. The communication is carried out, the telephone call circuit 10 is closed, and the state then shifts to the central office line telephone communication state.

Problems to be Solved by the Invention However, in the above-mentioned conventional cordless telephone device, downlink control from the base station 1 to the mobile station 2 and control of the downlink from the mobile station 2 to the base station 1 in the operation of receiving a call from the office line (telephone line) are difficult. In any case of uplink control in calling operation,
Base station 1 determines whether the first control channel is available or not.
Alternatively, the wireless reception circuits 6 and 7 of the mobile station 2 are only activated. For this reason, there are two
Only one side of a pair of wireless channels is checked using one frequency, and when multiple cordless telephones are used at the same time or a call is received at the same time, there is a possibility that a collision will occur when transmitting one frequency of the wireless channel. was there. If a collision occurs on the control channel, even if a call is made, the connection cannot be established or there is a delay, and when a call is received from the central office line, the mobile station may not be able to display an incoming call from the central office line or there may be a delay. , there was a problem that caused inconvenience to users.

The present invention is intended to solve these conventional problems, and aims to provide a cordless telephone device that can establish a reliable and quick wireless line connection.

Means for Solving the Problems In order to achieve the above object, the present invention, when determining whether a control channel is available, detects an electric field at the reception frequency of each base station or mobile station, as well as detects the transmission of the own station. A second radio receiving circuit is provided so that electric field detection can be performed at each frequency, and transmission is started after determining an empty channel for both transmission and reception frequencies.

Therefore, according to the present invention, since an empty channel is determined for both the uplink and downlink frequencies of the control channel, a call can be made or a Wireless connection operations for incoming calls can be performed. Therefore, even in an environment where multiple cordless telephone devices are used at the same time, it is possible to eliminate the possibility of a call originating or incoming call operation colliding. Therefore, it is possible to realize an excellent cordless telephone device that does not cause connection delays or connection failures due to this, and does not interfere with the connection operations of other cordless telephone devices.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention, and elements similar to those of the conventional example shown in FIG. 2 are given the same reference numerals. In FIG. 1, 1 is a base station, 2 is a mobile station, 3 is a radio line connecting these, 4 is a base station control circuit, 5 is a mobile station control circuit, and 6 is a first radio reception circuit of the base station. , 7 is a first radio reception circuit of the mobile station, 8 is a radio transmission circuit of the base station, 9 is a radio transmission circuit of the mobile station, 10 is a communication circuit, 11 is a receiver amplifier of the mobile station, and 12 is a microphone of the mobile station. amplifier, 13 and 14 are antennas for base station 1 and mobile station 2, respectively, 15 is a call button to be pressed when calling mobile station 2 from base station 1, 16 is a receiver, 17 is a microphone, and 18 is an operation button for the mobile station. It is a kind. Further, 19 is a second radio receiving circuit provided in the base station 1, and 2o is a second radio receiving circuit provided in the mobile station 2, each of which determines an empty channel with respect to the transmission frequency of its own station.

Next, the operation of the above embodiment will be explained. Assuming that there is an incoming call from the telephone line, the station arrival signal from the telephone line that has arrived at the communication circuit 10 is notified to the control circuit 4, and the downlink radio circuit connection operation from the base station 1 to the mobile station 2 is started. . First, the first radio receiving circuit 6 is operated, and the antenna 1 is
An empty channel determination is performed by detecting the strength of the radio waves of the wireless line 3 input from the wireless line 3. This is a check of the reception frequency of the base station 1, that is, an empty channel on the uplink side, and if it is not detected, then the second radio reception circuit 1
9 is operated to determine the transmission frequency on the base station 1 side, that is, the vacant channel on the downlink side. If this is also inactive, the wireless line 3 is determined to have control channels available for both uplink and downlink frequencies, and the wireless transmission circuit 8 is activated to start transmitting connection data from the control circuit 4.

On the other hand, while on standby, the mobile station 2 operates the first radio receiving circuit 7 intermittently, and receives the radio waves from the base station l.
When the electric field detection signal CDI from the radio receiving circuit 7 becomes sensitive, the control circuit 5 switches to continuous reception,
Taking in the connection data and passing it through the wireless transmission circuit 9,
After replying to the base station 1, the system moves to a communication channel for making a call, moves to the operation of receiving a call from the telephone line, and notifies the user of the call by blinking a lamp (not shown) provided on the mobile station 2 and outputting sound from a ringer. Take action to notify.

In the above operation, if there is another cordless telephone device that is receiving calls from the telephone line at the same time, even if the connection of wireless line 3 on the control channel is not completed for both uplink and downlink frequencies, other Since the second wireless receiving circuit 19 of the base station 1 can detect the radio waves transmitted from the base station of the cordless telephone device, it is possible to prevent collisions between wireless line connections. In this case, while the electric field detection of the second radio receiving circuit 19 is sensitive,
The system temporarily waits for the radio wave to be emitted from the wireless transmitting circuit 8, and when the output of the second wireless receiving circuit 19 becomes insensitive, the wireless transmitting circuit 8 is activated immediately and the control channel is connected. The control channel occupancy time is determined by law, so if multiple cordless telephone devices collide in connecting to the control channel, rather than trying to reconnect, they wait for a while and then immediately connect after detecting an empty space. This will result in a faster connection.

The same effect can be achieved even if the above connection procedure is replaced with an uplink calling operation from the mobile station 2 side, and the vacant determination of the transmission frequency on the mobile station 2 side is based on the electric field detection signal from the second radio receiving circuit 20. Performed using CD2. When both the outputs of the wireless receiving circuits 7 and 22 become inactive, the wireless transmitting circuit 9 sends out radio waves, so that even in the event of a call connection conflict with another cordless phone, it can be smoothly connected to the other cordless phone. Connection operations can be performed without disturbing the device.

It is similarly useful to determine availability of both uplink and downlink frequencies when making a call from base station 1 to mobile station 2, or from mobile station 2 to base station 1, or when connecting during an intercom call. be.

Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.

(1) In an environment where multiple cordless telephone devices are used, even if calls are received from the telephone line at the same time and the wireless line connection operations are performed almost simultaneously, the Since control channel availability is determined for both upstream and downstream line frequencies, it is also possible to detect when another cordless telephone device is in the middle of a wireless line connection where only one channel is emitting radio waves, thereby preventing collisions on the control channel. This can be prevented.

Therefore, without interfering with the connection of other cordless telephone devices, and by emitting radio waves immediately after the use of the control channel of other cordless telephone devices is finished, control data can be saved by waiting for a certain period of time or by collision. Wireless line connection can be established quickly and reliably without causing delays in operations such as detecting errors and reconnecting.

(2) Similarly, when a mobile station makes a call, it does not conflict with the calling operation of other cordless telephone devices, does not interfere with the channel connection operation of other cordless telephone devices, and does not have free control channels. Connection can be made as soon as the information is determined, and a reliable and quick wireless line connection can be established.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a cordless telephone device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional cordless telephone device. DESCRIPTION OF SYMBOLS 1...Base station, 2...Mobile station, 3...Radio line, 4...Base station control unit, 5...Mobile station control unit, 6...
...First radio receiving circuit on the base station side, 7... First radio receiving circuit on the mobile station side, 8... Radio transmitting circuit on the base station side, 9... Wireless transmission on the mobile station side Circuit, 10... Call circuit, 11... Receiver amplifier, 12... Microphone amplifier, 13... Antenna on the base station side, 14... Antenna on the mobile station side, 15... From the base station A call button to be pressed when calling a mobile station, 16...Receiver, 17.
...Macrophone, 18...Mobile station operation buttons, 1
9... Second radio receiving circuit that performs electric field detection on the base station transmission frequency, 20... Second radio receiving circuit that performs electric field detection on the mobile station transmission frequency. Name of agent Patent attorney Masahiro Kura Go Figure 1

Claims (2)

[Claims] (1) Consists of a base station connected to a telephone line and a mobile station wirelessly connected to this base station. A cordless telephone device characterized in that a base station is provided with a second radio receiving circuit for determining an empty channel based on a receiving frequency on the station side as well as an empty channel based on a transmitting frequency on the base station side. (2) When determining an empty channel before transmitting uplink radio waves from a mobile station to a base station, in addition to determining an empty channel based on the mobile station's receiving frequency, the mobile station's transmitting frequency is also used to determine an empty channel. 1. A cordless telephone device, characterized in that a mobile station is provided with a second radio reception circuit for performing radio communication.