JP2613954B2 - Wireless telephone system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone system, and more particularly, to a wireless telephone system capable of communicating with another terminal device via a wired telephone line.

[Conventional technology]

Conventionally, as this kind of wireless telephone system, there is a so-called cordless telephone system. The cordless telephone system includes a parent device connected to a wired telephone line and a wireless telephone connected to the parent device via a wireless line.

In order to support a plurality of lines, it is necessary to prepare a plurality of wireless telephones.

[Problems to be solved by the invention]

When multiple wireless telephones are prepared within a limited range to support multiple lines, depending on the combination of channels to be used, even though the channels are not actually used due to nonlinear distortion, There is a possibility that a case where it is determined to be performed may occur.

For example, two frequencies in close proximity (these are frequencies f ₁
Signal of the f ₂₎ is the input to the non-linear element, such as the use of Rechiru transistor radio unit, due to the influence of nonlinear distortion, it generates other frequency components. This phenomenon occurs not only in the high-frequency amplification circuit and frequency conversion circuit in the reception unit of the radio unit, but also in the power amplification circuit of the transmission unit that is affected by radio waves from a connection device operating nearby or a radio telephone. Occasionally, frequency components that occur and are caused by distortion may be retransmitted. In this case, third-order distortion is particularly problematic. When the frequency components of 2f ₁ −f ₂ and 2f ₂ −f ₁ match the frequency of the control channel due to the influence of the third-order distortion, the state becomes the same as when the control channel is occupied, which impairs connection control. In particular, as the number of wireless telephones during a call increases, the probability of matching the frequency of the control channel sharply increases.

The conventional radio telephone system has a drawback that the above-mentioned inconvenience cannot be prevented because no special consideration is given to the selection of the communication channel used by each radio telephone.

An object of the present invention is to provide a wireless telephone system in which connection is not disabled due to the influence of such non-linear distortion.

[Means for Solving the Problems] A wireless telephone system according to a first aspect of the present invention selects one of a plurality of wireless channels which are connected to at least one wired telephone line and which are predetermined at predetermined frequency intervals, and transmit and receive data. A connection device having at least one radio unit for receiving and a control unit for controlling the radio unit to use the even-numbered radio channel as a control channel and use the odd-numbered radio channel as a communication channel;
At least one wireless telephone for making a call on the communication channel designated by the connection device is provided.

According to a second aspect of the present invention, there is provided at least one wireless unit which is connected to at least one wired telephone line, selects one of a plurality of wireless channels predetermined at predetermined frequency intervals, and performs transmission and reception. And a connection device having a control unit that controls the wireless unit to use the odd-numbered wireless channel as a control channel and use the even-numbered wireless channel as a communication channel;
At least one wireless telephone for making a call on the communication channel designated by the connection device is provided.

A wireless telephone system according to a third aspect of the present invention comprises: a parent device connected to at least one wired telephone line; and two wireless zones; zone storage means; A radio unit for transmitting and receiving an acoustic signal and a connection control signal via the wired line, and selecting and transmitting and receiving one of a plurality of predetermined radio channels at predetermined frequency intervals, and the zone in one of the radio zones The even-numbered wireless channels are used as control channels according to the contents of the storage means, the odd-numbered wireless channels are used as communication channels, and the odd-numbered wireless channels are controlled in the other wireless zone according to the contents of the zone storage means. The radio unit so as to use the even-numbered radio channels as communication channels A control unit at least two connecting devices comprises controlling, at least make a call on a specified traffic channel from these connection devices are provided and one of the radio telephone.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

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

The parent device (ME) 100 accommodates the wired telephone lines 101, 102,... 10J, and performs an exchange operation with the wired lines 111, 112,. 11n connected to the wired lines 111, 112,... 11n are installed in the wireless zone 1 and connected to wireless telephones (TEL) 311, 32 to 31l in the wireless zone 1 via wireless lines. . Similarly, wired lines 121, 122,… 12m
, 22m connected to the wireless telephones 321, 322,... 32p in the wireless zone 2.
And via a wireless line.

FIG. 2 is a block diagram showing the configuration of the connection device 211.

The radio unit (TRX) 2112 selects and transmits / receives one of the radio channels predetermined at predetermined frequency intervals under the control of the control unit (CONT) 2113 via the radio unit control line C. The exchange of the audio signal with the wireless telephone is performed by the parent device connection line 111, the parent device control unit (MEI / F) 2
111, the audio signal line a, and the wireless unit 2112.

The control unit 2113 refers to the state of the zone memory (MEM) 2114 and knows that it is installed in the wireless zone 1 of the two wireless zones. For example, the control unit 2113 has an even-numbered wireless channel (eg, 46 CH) as a control channel. And use only odd-numbered radio channels as communication channels.

Other configurations and operations of the connection device are the same as those of the connection device 211. Those installed in the wireless zone 2 use odd-numbered wireless channels (for example, 89CH) as control channels, and select and use only even-numbered wireless channels as communication channels.

As described above, by selecting the control channel and the communication channel, it is possible to avoid adverse effects on the control channel even when a plurality of connecting devices are in a communication state and a component due to nonlinear distortion is generated. FIG. 3 shows this state. The solid line represents the radio wave of the used communication channel, and the broken line represents the component caused by the tertiary distortion, which is generally the most influential among the nonlinear distortions. 5
The same can be said for higher-order strains such as the 7th and 7th orders. Even-order distortions such as second-order and fourth-order distortions do not usually pose a problem because they occur in portions that are significantly different from the used band.

In the case of FIG. 3A, since the communication channels are all odd-numbered channels, the components caused by the non-linear distortion are all channels corresponding to the odd-numbered channels, and are the same components as the control channels using the even-numbered channels. Is not possible. Similarly, in the case of FIG. 3 (b), since the communication channels are all even-numbered channels, the components caused by the nonlinear distortion are all even-numbered channels, and generate the same components as the control channels using the odd-numbered channels. There is no possibility.

Therefore, at least the control channel is determined to be in use by the component generated by the non-linear distortion, and there is no problem in the wireless connection between the connection device and the wireless telephone.

Note that the zone storage device may be any device that can determine which zone the device is installed in, such as a switch set at the time of installation, a device determined by selection of a wiring method, or a preset semiconductor memory.

The embodiment of the third invention having two wireless zones has been described above.

Even when there is one wireless zone, the first invention or the second invention
By applying only the odd-numbered or even-numbered radio channel as the communication channel and using the even-numbered or odd-numbered radio channel as the control channel, the same effect can be obtained.

〔The invention's effect〕

As described above, the first and second inventions use only odd-numbered or even-numbered radio channels as communication channels, and use even-numbered or odd-numbered radio channels as control channels. Is 2
According to a third aspect of the present invention, in one zone, the control channel of the even-numbered radio channel and the communication channel of the odd-numbered radio channel are used, and in the other zone, the control channel of the odd-numbered radio channel and the By using the radio channel and the communication channel, each invention avoids the effect of non-linear distortion caused by installing a large number of radios in close proximity and using them at the same time,
The control channel is not considered to be in use for a long time, so that there is an effect that the connection control between the connection device and the wireless telephone is not hindered.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the wireless telephone system of the present invention, FIG. 2 is a block diagram showing a configuration of a connection device 211 in FIG. 1, and FIGS. 3 (a) and 3 (b) are all shown. FIG. 2 is a diagram for explaining a frequency relationship between a communication channel and a third-order nonlinear distortion generated from the communication channel in the embodiment shown in FIG. 1; 1,2… Wireless zone, 100… Parent device, 101,102,10J…
Wired telephone line, 111, 112, 11n, 121, 122, 12n ... Wired line, 211, 212, 21n, 221, 222, 22m ... Connection device, 311, 312, 3
1l, 321,322,32P …… Wireless telephone, 2111 …… Connection part, 2112
...... Wireless unit, 2113 ... Control unit, 2114 ... Zone memory,
a ... sound signal line, b ... connection part control line, c ... radio part control line.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinji Kumagaka 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kosuke Hashimoto 2-5-7 Koishikawa, Bunkyo-ku, Tokyo Meisei Electric Co., Ltd. (56) References JP-A-56-149834 (JP, A) JP-A-60-181945 (JP, A)

Claims (3)

(57) [Claims] At least one of a plurality of wireless channels connected to at least one wired telephone line and selected and transmitted and received at a predetermined frequency interval from one of a plurality of predetermined wireless channels.
A connection device having one radio unit and a control unit that controls the radio unit to use the even-numbered radio channel as a control channel and use the odd-numbered radio channel as a communication channel; and a connection device designated by the connection device. A wireless telephone system, comprising: at least one wireless telephone for making a call on the communication channel. 2. At least one communication terminal connected to at least one wired telephone line for selecting and transmitting and receiving one of a plurality of predetermined radio channels at predetermined frequency intervals.
A connection device having one radio unit and a control unit that controls the radio unit to use the odd-numbered radio channel as a control channel and use the even-numbered radio channel as a communication channel; and a connection device designated by the connection device. A wireless telephone system, comprising: at least one wireless telephone for making a call on the communication channel. 3. A parent device connected to at least one wired telephone line, and two wireless zones are formed. Zone storage means, connected to the parent device via a wired line, and connected via the wired line during a telephone call. A radio unit for transmitting and receiving an audio signal and a connection control signal and selecting and transmitting one of a plurality of predetermined radio channels at predetermined frequency intervals, and, in one of the radio zones, according to the contents of the zone storage means. The even-numbered radio channel is used as a control channel, the odd-numbered radio channel is used as a communication channel, and the other radio zone uses the odd-numbered radio channel as a control channel according to the contents of the zone storage means. A control unit for controlling the wireless unit to use the third wireless channel as a call channel. Least radiotelephone system, wherein the two connecting devices, by comprising the at least one radiotelephone make a call on a specified traffic channel from these connected devices that.