JPS62257227A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To ensure the communication when a master equipment exists at an optional location where a telephone set is carried in a premises by providing a means connectable to the master equipment except a specific master equipment under a special condition. CONSTITUTION:A call identification signal (ID signal) of an optional telephone set is stored in an ID memory collation section 1-1, which is fitted to the output side of a reception section 1-2 of the master equipment 1. When a telephone set 2 making a call is a telephone set (B) 2 not belonging to the master equipment 1, the ID information of the telephone set (B) 2 is stored in the ID memory collation section 1-1, then the ID memory collation section 1-1 sends a signal of call OK to a control section l-3 to attain the talking from the telephone set (B) 2. When a call comes to the master equipment 1, the ID information of a telephone set (A) 2 belonging to the master equipment l is called at first, and when no reply comes from the telephone set (A) 2, an incoming signal is sent sequentially to all the telephone sets 2 corresponding to the ID information stored in a memory circuit in the ID memory collation section 1-1 at each prescribed interval and the telephone set (P)2 receives surely the call in the vicinity of the master equipment 1 being the destination.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a wireless communication system, particularly a cordless telephone, in which a plurality of wireless channels are shared by a plurality of parent devices each connected to a plurality of telephones, and the present invention relates to This invention relates to a system that uses weak radio waves to communicate between each telephone and its opposing parent device.

(Prior art and its problems) This type of conventional system uses a portable telephone,
It consists of a parent device that is connected to the telephone via a wireless line and to the exchange via a wired line. Furthermore, this phone and the parent device connected to it usually have a specific affiliation relationship, and the phone can communicate with other parent devices other than that specific parent device even if they are installed within a short distance where wireless communication is possible. communication was not possible even if there was a telephone other than that particular telephone in a particular combination from that particular parent device, even if there was a telephone within a short distance where wireless communication was possible. .

This is natural in a sense, and if the above impossible connection were made possible without any conditions, then
This may result in an erroneous connection, which may have negative effects such as erroneous billing or intentional transfer of charges to one's own telephone to another telephone. In order to avoid this, the technical problem was how to set up a communication line between the telephone and its corresponding parent device, or only between these specific devices.

The system described above was designed assuming that only one or a few cordless telephones are used, such as in ordinary houses or small shops, and is actually used extensively in ordinary houses in Japan.

However, with this system, if a large number of cordless telephones in large factories, large stores, etc. are used in the same way as extension phones connected to a PBX in a business office, it will be inconvenient to use, as shown below. Also, erroneous billing,
It has been found that the problem of incorrect connections is different from that used in ordinary homes, so the problem in the original sense has disappeared. In other words, when a call is made from an extension telephone housed in a PBX to an outside party, the telephone charge is not charged to each extension telephone.P
Since the current system is to charge each BX as a unit of one company using the PBX, assuming that cordless telephones are located in the same way as the extension telephones mentioned above, the erroneous billing problem that occurred in ordinary residences is in this case. There is no particular problem. Of course, if the premises of one company and the premises of another company are adjacent to each other, there will be a problem of erroneous billing to the other company, similar to the erroneous billing for -C housing, but this can be prevented with other measures. It is possible.

The next problem is the narrowness of the service area of the Group's cordless telephones. Currently, some cordless telephone services are being put into practical use in Japan, but the service area in these cases is determined to be within a 20 meter radius around device a from the viewpoint of call quality. However, when large numbers of workers are working or doing office work on the premises of a large company, and they move frequently and use cordless telephones, which are convenient to carry, the range of their activities often exceeds 20 meters. Even if the parent device is called to make a call from a point 20 meters or more away from the parent device, the electric field strength is less than the required value, resulting in connection failure and call quality deterioration, which inevitably leads to a significant drop in work efficiency. At this time, even if another master device is installed within 20 meters from the telephone, it will not be able to connect as explained above, and the current situation is that it has extremely incomplete functions as a cordless telephone for corporate premises. Met.

(Object of the Invention) In order to solve the above-mentioned problems, the present invention provides a cordless telephone mainly used within the premises of a company's office.
By providing a means that allows a telephone to connect under certain conditions to a parent device other than the specific parent device that is connected to the telephone via a wireless line, it is possible to carry the telephone to any location within the premises. To provide a cordless telephone that can secure communication if a master device is present at the location.

(Structure and operation of the invention) The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows a cordless telephone parent device 1 and a plurality of telephones 2 according to the invention. In FIG. 1, the line within the dashed line on the left is the parent device l, and the call identification signal (
(hereinafter referred to as ID signal)! D memory collation part if
was attached to the output side of the receiving section 1-2 of the parent device 1, and required control information was mutually transmitted with the control section 1-3, thereby making the following operations possible.

(Call originating from a telephone belonging to the parent device) During standby, the parent device and the telephone are on standby on a designated control channel.

First, it is assumed that a call is made from telephone 1(A)2 on the right side of FIG. In this case, it is assumed that the telephone a(A)2 always belongs to the parent device 1 and forms an l group. Telephone (A
) 2 goes off-hook (starts making a call), in this case a calling identification signal is added to the ID information, and the calling signal is sent to the control unit 2.
-3, the signal is sent to the receiving unit l-2 of the parent device l via the control channel via the transmitting unit 2-1. As a result, on the output side of the receiving section 1-2 of the parent device 1, the control section 1-3 composed of a microcomputer or the like sends a confirmation signal (ID signal) determined to correspond to the telephone (A) 2. ) and starts calling operation. This sequence is shown in FIG.

That is, the parent device 1 finds a currently unused communication channel, uses the synthesizer oscillator l-4 to switch to a predetermined communication channel, and instructs the telephone (A) 2 to switch to this communication channel. Telephone (A)
2, in accordance with instructions from the parent device 1, the synthesizer oscillator 2-7 is controlled using the control unit 2-3 constituted by a microcomputer, etc., and switched to the designated communication channel, and the parent device 1
A CH switching completion signal is sent to. Therefore, after both parties check for free channels and check whether there is any interference, if it is determined that a call is possible, the control section 2-3 of the telephone a (A) 2 switches the switch circuit 2-5°. 2-6 is turned on and the communication circuit 2-4 is connected to the receiving section 2-2 and the transmitting section 2-1, and the control section 1-3 of the parent device 1 is placed on the central line side of the hybrid H (not shown). The DC loop to the central office line is closed by a DC connection circuit. In addition, the control unit 1-3 of the parent device
By turning on the switches 1-6 and 1-7, the station line and the transmitting section 1-5 and the receiving section 1-2 and the station line are connected. At this time, a dial tone is heard on the telephone a (A) 2, and when the user performs a dial operation, a dial pulse (PB double signal) is sent to the exchange (not shown) via the master device 1 and the central office line.

A telephone call is then started according to the sequence shown in FIG.

The above operation is the state in which the cordless telephone is used when the telephone (A) 2 is in a normal connection relationship with the parent device 1.

(Calling from a telephone that does not belong to the device m) However, when the calling telephone a2 is a telephone (B) 2 that does not belong to the parent device l, the identification included in the self-identification control signal ( ID) ID whose information is stored in parent device 1
In the conventional system, this information was discarded and the call operation did not proceed because it differed from the information. However, in the present invention, since a new ID memory collation 1-1 is provided, ID information can be stored, rewritten, or deleted here.

That is, if the ID information of the telephone (B) 2 that does not belong to the parent device I is stored in this ID memory verification 1-1 by the operation described below, the ID memory verification 1-1 The calling operation from telephone (B) 2 is performed by transmitting a call OK signal to telephone 4ffi (A).
) Follow the same sequence as 2 to enable a call.

However, if the ID information of the telephone a(B)2 has not been stored before then, the ID memory verification 1-1 cannot be verified and the calling operation is not performed and ends at this point.

(Storing ID information in the ID verification section) As described above, even the telephone a (B) 2 that does not belong to the parent device 1 of the present invention operates the ID verification section l-1 of the parent device l to make a call. However, in this case, the necessary I
Storage of ID information in the D matching section 1-1 will be described next.

First, a method is to permanently store the ID information of a specific telephone 1 (P) 2, which does not belong to the parent device 1, in the memory circuit of ID memory verification 1-1 in FIG. 1 so that it can be used at any time. There is. This is convenient when a large number of cordless telephones are installed in a business office, etc., and executives of the business office bring their own cordless telephones with them when touring each department. That is, if the ID information of the cordless telephone owned by an executive is stored in the semi-permanent memory circuit (ROM) in the ID collation unit 1-1 of the parent device 1 of all installed cordless telephones, the telephone ( From P)2, it is possible to make a call using any parent device 1.

Next, for cordless telephones that are desired to be used temporarily in many locations within a business office, it is convenient to temporarily store the information in a temporary memory circuit (RAM) of the ID memory collation unit IT. A specific method for storing data in this temporary memory circuit (RAM) is as described above when the telephone (T) 2 makes a call to the parent device 1 as a phone that does not belong to the parent device 1. Since the ID information of the telephone (T) 2 is not recorded in the temporary memory 4 of the ID memory collation unit 1-1 and the α circuit (RAM), the call cannot be completed in the first call operation. I can't, but the phone (T
)2 ID information shall be temporarily stored. This is technically easily possible. By doing this, if there is a call again from the telephone (T) 2, the I
The temporary storage device (RAM) of the D-memory matching unit is able to match the newly sent ID signal of the telephone 1 (T) 2 with the already stored ID information, and if a match is found, the telephone a(T)2 becomes able to make a call.

! As a condition for temporarily storing it in the temporary memory circuit (RAM) of the D memory collation unit 1-1, a class is provided for each telephone that wants to make a call, and the first class of telephones (managers) performs the calling operation twice as described above. If the calling operation is repeated three times, the second class telephone (general company equipment) will be able to make a call, but if the calling operation is not repeated three times, the temporary storage circuit (RAM) of the ID memory verification unit 1-1 will be
), it is possible to restrict the frequency of use by class by, for example, limiting the frequency of use by, for example, not being able to make a call unless it is repeated. An example of operation in this case is shown in FIG.

In addition, [temporary storage circuit (RAM) of the D memory collation unit if]
For example, if a maximum storage capacity is set for 10 pieces of ID information, and there is a request to store the 11th ID information, it will be accepted, but the oldest ID information will be deleted sequentially, or It is also possible to limit the memory retention period, such as , -weeks, -days, etc. Furthermore, it is also possible to provide a lock function that stores part of the ID memory information once stored without erasing it until a special request is made.

As a function of the ID verification unit 1-1 housed in the parent device l,
In addition, it is also possible to make a call possible as long as part of the ID information matches. As shown in Figure 3, the first 10 bits are used as an ID signal to identify the company name, and the remaining 1 bits are used to identify the company name.
If the configuration is such that the 0 bit is used to identify departments or individuals within the company, for example, if a cordless telephone within the company is allowed to make calls from any cordless viewing device within the company, the first 1O bit will be used. In other words, it is sufficient to identify the company itself, and the simplification of the circuit configuration of the ID memory collation unit 1-1 is effective in shortening the time required for the calling operation.

(Incoming call to a telephone) The present invention has been described above regarding a call originating from a telephone.
Incoming calls to the telephone will be explained below.

Telephones existing in the vicinity (within 20 meters) of the 11 devices are waiting on the same control channel.

In FIG. 1, it is assumed that a call is received from a central office line to cordless telephone 2 via parent device 1. In this case, the caller is making a call hoping to receive a call to the telephone a(A)2 that normally belongs to the parent device 1, and the operation in this case is shown in the signal format of FIG. Depending on the ID information, the phone (A
)2 is specified, and a call is received to the telephone in the same manner as in the conventional system. This sequence is shown in the lower half of FIG.

However, it is assumed that some of the calling parties know that the called party has left his/her own seat and, for example, that the telephone (P) 2 is present in the parent device 1, and makes a call to the parent device 1.

In this case, if there is a phone a (A > 2) belonging to device a, the incoming call will be made to that phone a (A) 2, and there is no problem. However, if phone (A) 2 is A problem arises when a call is received when the person is absent after moving to the location of A system is adopted in which the ID information belonging to the device 1 is called in chronological order.In other words, when a call arrives at the parent device 1, the telephone (A
) 2 is first called, and if there is no response from the telephone a (A) 2, it is stored in the memory circuit (ROM, RAM) in the ID memory collation unit 1-1 at regular intervals [corresponding to the D information An incoming call signal is sequentially sent to all telephones a2.

That is, the incoming call signal and I that call the telephone (A) 2 from the parent device
D information is first sent, and if there is a response from telephone (A) 2 within a certain period of time, a communication channel is set in the same manner as in the above-mentioned calling operation. If there is no response from telephone (A) 2 within a certain period of time, it is determined that telephone (A) 2 does not exist in the vicinity, and the incoming call signal and ID information of telephone (B) 2 are sent out, and the telephone (B) 2 is sent for a certain period of time. Wait for response.

This operation causes the telephone (P
) 2 is also present, ID memory verification 1- of parent device 1 is performed.
As long as the ID information of phone a(P)2 is stored in 1,
A ringing signal will always be issued, and when the telephone (P) 2 receives its own ID information, it will ring and the user will know that there is an incoming call. In this way, the telephone (P) 2 can reliably receive an incoming call near the parent device 1 at the destination.

In the above explanation, a digital signal is used as the control signal, but similar operations can be performed using an analog signal such as a multi-frequency tone.

(Effects of the Invention) By using the present invention as a substitute for conventional cordless telephones, it has been possible to make calls only from telephones belonging to a predetermined parent device. All cordless telephones within the same office can make calls from any parent device within the office, and calls can be made to cordless telephones as well as from phones belonging to a given parent device.
This makes it possible to receive calls to all telephones with ID information stored in the memory of the ID memory collation unit in the parent device, which greatly contributes to improving the work efficiency of the office.

[Brief explanation of drawings]

Fig. 1 is a layout diagram showing an example of a cordless telephone system using the present invention, Fig. 2 is a flow chart 1-1 showing a call originating or receiving sequence of the cordless telephone system of the present invention, and Fig. 3 is used in the present invention. Cordless telephone I
FIG. 4 is a signal format diagram showing an example of the D signal, and is a flowchart showing the main operations of calling according to the present invention. voice 2 ward

Claims (1)

[Claims] In a cordless telephone system in which a plurality of telephones and a plurality of sets of parent devices connected to the plurality of telephones by a wireless line and connected to an exchange by a wired line share a plurality of wireless channels, the required number of the plurality of telephones is If a plurality of identification information is stored in advance so as to correspond to a number of telephones, or the identification information sent from the telephone is stored according to predetermined conditions, and the identification information is then received again from the telephone. . A cordless telephone system, characterized in that the parent device is configured to send a connection signal to the exchange so that the telephone can communicate with a desired destination telephone.