JPH07143547A - Digital radio telephone system - Google Patents

Abstract

PURPOSE:To provide a radio telephone system for shortening interruption time at the time of switching a channel by detecting the generation of interference to the channel. CONSTITUTION:Concerning the radio telephone system for performing transmission/reception with the base unit or slave unit of the radio telephone system, this system is provided with an idle frequency managing part 10 for registering the channel of less interference separately from the speaking channel and a control part 8 for detecting the generation of interference to the speaking channel and switching the speaking channel to another channel previously registered on the idle frequency managing part 10 and when switching the channel during the direct speaking between slave units, the control part 8 uses the frequency preserved in the idle frequency managing part 10 so as to shorten time until the call originating side and the call terminating side are synchronized again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone.

[0002]

2. Description of the Related Art In recent years, wireless telephone devices have come into wide use as their convenience and economy have improved.
Among them, cordless telephones that limit the usable range for offices and homes, and wireless telephones that convert analog signals into digital signals for communication have become widespread, and direct calls between handset devices are also performed.

A conventional handset 11 of a digital radio telephone is constructed as shown in FIG. Reference numeral 1 is a radio unit for performing radio communication with a master unit or a slave unit of a digital radio telephone, 2 is an antenna, 3 is a voice decoding unit for decoding a received digital signal into a voice signal, 4 is a receiving unit for outputting voice, 5
Is a voice transmitter, 6 is a voice encoder that encodes the voice signal input by the voice transmitter 5 into a digital signal, 7 is a key operation unit,
Reference numeral 8 is a control unit that supplies power to the above-mentioned units to control them, and also performs error correction of the digital signal, and 9 is an electric field detection unit that detects the electric field level. The user of the wireless telephone device
When making a direct call, the calling side uses the key operation unit 7
Input the dial at to make a call. When the calling operation is completed, the control unit 8 determines the electric field level from the electric field detection unit 9 to determine the frequency at which the radio wave is output, the call request signal is converted into the radio signal by the radio unit 1, and the antenna is transmitted. The signal is output as a radio wave via 2. The called side dials the key operation unit 7 to perform an incoming call waiting operation. When the operation is completed, the control unit 8 switches the waiting frequency at regular time intervals and waits for the radio wave to arrive via the antenna 2. When the above-mentioned radio wave arrives at the called side via the antenna 2, it is converted into a call request signal by the radio section 1 and reaches the control section 8. The control unit 8 converts the response signal to this into a wireless signal by the wireless unit 1 and outputs it as a wireless radio wave via the antenna 2 to start a call. When the wireless radio wave arrives at the calling side via the antenna 2, it is converted into a response signal by the wireless unit 1 and reaches the control unit 8. Upon receiving this, the control unit 8 starts the call. When radio wave interference occurs during a call, the side that detects the interference sends a channel switching start signal, and the calling side and the called side start channel switching. On the calling side, the control unit 8 determines the electric field level from the electric field detection unit 9 to determine the frequency at which the radio wave is output, the synchronization request signal is converted into a radio signal by the radio unit 1, and the radio wave is transmitted via the antenna 2. Output as. On the called side, the control unit 8 switches the waiting frequency at regular intervals and waits for the radio wave to arrive via the antenna 2. When the above-mentioned radio wave arrives at the called side via the antenna 2, the radio section 1 converts the radio wave into a synchronization request signal and reaches the control section 8. The control unit 8 converts the synchronization response signal to this into a wireless signal in the wireless unit 1 and outputs it as a wireless radio wave via the antenna 2 to restart the call. When the radio wave is received via the antenna 2, the calling side converts the radio wave into a synchronization response signal in the radio unit 1 and controls the control unit 8
To reach. The control unit 8 receives this and resumes the call.

[0004]

In such a conventional digital radiotelephone device, when channel switching is performed in order to avoid radio wave interference, the calling side searches for a new empty channel each time and performs radio communication. Output radio waves. Since the called side is configured to wait for radio waves by switching a number of frequencies at fixed intervals, it takes a long time to synchronize with the radio waves output by the calling side, and the time during which the call is cut off. Has the problem of being long.

An object of the present invention is to provide a radiotelephone device capable of shortening the time during which a call is interrupted when the occurrence of interference in a call channel is detected and the channel is switched.

[0006]

According to a first aspect of the present invention, there is provided a radiotelephone device for transmitting / receiving data to / from a master device or a slave device of the radiotelephone device, in which a channel with less interference is registered separately from a call channel. And a control unit for detecting the occurrence of interference in the communication channel and switching the communication channel to another channel registered in advance in the communication frequency management unit.

According to a second aspect of the present invention, in the wireless telephone device for transmitting / receiving to / from a master unit or a slave unit of the wireless telephone device, a free frequency management unit in which a channel with less interference is registered in addition to a call channel. If it is the calling side, the occurrence of interference in the communication channel is detected, or the channel switching start signal from the called side is detected and the channel switching start signal is output to the called side. The call channel is switched to another channel that is registered in advance in the idle frequency management unit, and if the called side is detected, the occurrence of interference in the call channel is detected and a channel switching start signal is output to the calling side. And a control unit that scans a call channel to another channel pre-registered in the free frequency management unit and waits for an incoming call.

According to a third aspect of the present invention, in the radio telephone device for transmitting / receiving to / from a master unit or a slave unit of the radio telephone device, a free frequency management unit in which a channel with less interference is registered in addition to a call channel. If it is the calling side, the channel information registered in the free frequency management section of the called side is transmitted to the free frequency management section of the called side to detect the occurrence of interference on the call channel or Detecting a channel switching start signal from the calling side, outputting a channel switching start signal to the called side, and switching the call channel to another channel registered in advance in the idle frequency management unit, which is the called side. In this case, the channel information from the calling side is registered in its own free frequency management unit, the occurrence of interference in the call channel is detected, and a channel switching start signal is output to the calling side to output the empty frequency. Scan the communication channel which has been previously registered in the management unit, characterized in that a control unit to listen for incoming.

[0009]

With this structure, the calling side stores a plurality of empty frequency candidates in the empty frequency management section, and the called side also stores a plurality of empty frequency candidates notified by the calling side. When performing channel switching in order to avoid radio wave interference during a direct call between handset units, the calling side selects from among the available frequency candidates, so the time taken to determine the frequency to be used can be shortened. Further, since the called side switches the frequency from among the available frequency candidates and waits, it is possible to shorten the time taken to synchronize with the radio wave output by the calling side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. 1 is a radio unit, 2 is an antenna, 3 is a voice decoding unit, 4
Is a receiving section, 5 is a transmitting section, 6 is a voice encoding section, 7 is a key operation section, 8 is a control section, and 9 is an electric field detecting section, and perform the same operation as in the conventional example. Reference numeral 10 denotes a free frequency management unit that manages free frequency information, and each of the above blocks constitutes a slave unit 11 of the digital wireless telephone. Next, the configuration of the control unit 8 will be described based on the operation.

When the user of the wireless telephone device makes a direct call between the slave units, the calling side dials the key operation unit 7 to perform the calling operation. When the calling operation ends, the control unit 8
Determines the electric field level from the electric field detection unit 9 to determine the frequency at which the radio wave is output, selects one or more available free frequencies, and notifies the available frequency management unit 10 together with the electric field level value. . Free frequency management unit 1
At 0, frequencies are prioritized according to the electric field level value and managed as free frequency information. Next, the call request signal and the vacant frequency information are converted into a radio signal by the radio unit 1 and output as a radio wave via the antenna 2. The called side dials the key operation unit 7 to perform an incoming call waiting operation. When the operation is completed, the control unit 8 on the called side switches the waiting frequency at regular intervals so that the radio wave is transmitted to the antenna 2
Await incoming calls via. When the above-mentioned radio wave arrives at the called side via the antenna 2, the radio section 1 converts the call request signal and the vacant frequency information and reaches the control section 8. The control unit 8 converts a response signal in response to this into a wireless signal by the wireless unit 1 and outputs it as a wireless radio wave via the antenna 2 to start a call, and stores empty frequency information in the empty frequency management unit 10. When the wireless radio wave arrives at the calling side via the antenna 2, it is converted into a response signal by the wireless unit 1 and reaches the control unit 8. Upon receiving this, the control unit 8 starts the call.

When radio wave interference is detected during a call, the side that has detected the interference transmits a channel switching start signal, and the calling side and the called side start channel switching. On the calling side, the control unit 8 determines the frequency at which a radio wave is output based on the information from the free frequency management unit 10 and the electric field level from the electric field detection unit 9, and the synchronization request signal is converted into a radio signal by the radio unit 1, The radio wave is output via the antenna 2. On the called side, the control unit 8 switches the frequency notified by the information from the idle frequency management unit 10 at regular intervals, and waits for the radio wave to arrive through the antenna 2. When the above-mentioned radio wave arrives at the called side via the antenna 2, the radio section 1 converts the radio wave into a synchronization request signal and reaches the control section 8. The control unit 8 converts the synchronization response signal to this into a wireless signal in the wireless unit 1 and outputs it as a wireless radio wave via the antenna 2 to restart the call. When the wireless radio wave arrives at the calling side via the antenna 2, it is converted into a synchronization response signal by the wireless unit 1 and reaches the control unit 8. The control unit 8 receives this and resumes the call.

[0013]

As described above, according to the present invention, when the idle frequency management unit is provided in the slave unit of the digital radio telephone, the channel switching is performed by the interference of radio waves,
Since the calling side determines the frequency at which the radio wave is output from the available frequency candidates stored in the free frequency management unit, the time until the radio wave is output can be shortened.

Further, since the called side switches the frequency from among the empty frequency candidates stored in the empty frequency management section and waits, the time taken to synchronize with the radio wave output by the calling side is shortened. be able to. For this reason, the time required for channel switching can be shortened, the time during which a call is interrupted can be shortened, and the discomfort given to the user can be reduced, which is practically effective.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a conventional digital wireless telephone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio part 2 Antenna 3 Voice decoding part 4 Reception part 5 Transmitting part 6 Voice coding part 7 Key operation part 8 Control part 9 Electric field detection part 10 Free frequency management part 11 Handset of digital radio telephone

Claims (3)

[Claims] 1. In a radiotelephone device for transmitting / receiving to / from a master unit or a slave unit of a radiotelephone device, an idle frequency management unit in which a channel with less interference is registered separately from a call channel, and interference occurs in the call channel. And a control unit for switching the communication channel to another channel registered in advance in the free frequency management unit. 2. A radiotelephone device that transmits / receives data to / from a master unit or a slave unit of a radiotelephone device, wherein a free frequency management unit in which a channel with less interference is registered in addition to a call channel and a calling side are used. Detects the occurrence of interference on the call channel or detects a channel switching start signal from the called side, outputs a channel switching start signal to the called side, and is registered in advance in the idle frequency management section. Switch the call channel to another channel, and if it is the called side, it detects the occurrence of interference on the call channel, outputs a channel switching start signal to the calling side, and registers it in the free frequency management section in advance. A wireless telephone device provided with a control unit that scans a call channel to another available channel and waits for an incoming call. 3. In a radiotelephone device for transmitting / receiving data to / from a master unit or a slave unit of a radiotelephone device, an idle frequency management unit in which a channel with less interference is registered in addition to a call channel, and a calling side Sends the channel information registered in its free frequency management section to the free frequency management section of the called side to detect the occurrence of interference in the call channel or to send a channel switching start signal from the called side. Upon detection, a channel switching start signal is output to the called side to switch the call channel to another channel registered in advance in the idle frequency management section. If the called side, the calling side The channel information is registered in its own free frequency management unit, the occurrence of interference in the call channel is detected, a channel switching start signal is output to the calling side, and the call is registered in advance in the free frequency management unit. A wireless telephone device provided with a control unit that scans channels and waits for incoming calls.