JPS62293832A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To improve the working efficiency by allowing the titled telephone set to continue the talking if another master set exists in the vicinity even if the titled set is in use during walking and parted from a master set talked with at first. CONSTITUTION:When the telephone set A is parted from the master set 1, the deterioration in the talking quality takes place and it is detected by the telephone set A or the master set 1. Then the telephone set A or the master set 1 enters cutting off a radio line. The telephone set A stops the use of a talking channel simultaneously and uses a control channel CH to send a telephone number signal of the opposite party stored in a call information memory section of the telephone set in addition to its ID signal. The call signal is received by the master set 2 near the telephone set. Whe it is discriminated that the master set 2 is not in talking, the ID signal of the telephone set A sending the call signal is registered in the master set 2, a radio channel capable of calling is set and excellent talking is executionable, a reply signal addressed to the telephone set A is sent to call the telephone set of the opposite party to continue the talking.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Technical Field of the Invention) The present invention relates to a wireless communication system, and particularly to a cordless telephone device. The present invention relates to a device that is shared by multiple telephone sets and that communicates between each telephone set and the opposing base unit using weak radio waves within a narrow area.

(Prior art and its problems) Conventional devices of this type consist of a portable telephone and a parent device that is connected to the telephone via a wireless line and connected to an exchange via a wired line. There is. Roughly speaking, this telephone and the parent device connected to it usually form a specific affiliation relationship, and the telephone can communicate with parent devices other than that specific parent device even if they are within a short distance where wireless communication is possible. Even if a phone is installed, communication is not possible, and even if a phone other than that phone that is in a specific combination with that specific parent device exists within a short distance where wireless communication is possible, communication may not be possible. Ta.

This is natural in a sense, and if the above impossible connection were made possible without any conditions, then
This will result in an erroneous connection, which will 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 establish a communication line between the telephone and its corresponding parent device, or only between these specific devices.

The device described above was designed assuming that only one or a few cordless telephones are used, such as in a general residence or a small store, and is actually widely used in general residences in Japan.

However, with this device, if a large number of cordless telephones such as large factories and large stores are used in the same manner as extension telephones connected to a PBX in a business office, it is inconvenient to use as shown below. It was also found that the problems of erroneous billing and erroneous connections are different from those used in ordinary homes, so the problems in the original sense disappear. In other words, when making a call to an external party from an extension telephone housed in a PBX, the telephone charge is not charged to each individual extension telephone, but is billed to the PBX as a single company using the PBX. If we assume that cordless telephones are treated in the same way as extension telephones, the erroneous billing problems that have been a problem in ordinary homes will not be a particular problem in this case. 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 charges being made to the other company, similar to the erroneous billing for general housing, but this can be prevented with other measures. It is possible.

The next problem is the narrow service area of the group's cordless telephones. Currently, there are cordless telephone services that are in practical use in Japan, but the service area in these cases is defined as a radius of 20 meters from the main device in terms of call quality. However, when many employees are working or doing office work on the premises of a large company, and they move frequently and use cordless phones, which are convenient to carry, the range of their activities often exceeds 20 meters, and they may be unable to communicate while talking. If you walk beyond this range, the call quality will deteriorate and you will be unable to make a call. Furthermore, even if the parent device is called to make a call at a point 20 meters or more away from the parent device, the 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 point, even if another master device is installed within 20 meters from the phone, it will not be possible to connect as explained above, and as a cordless phone device for companies etc., it still has incomplete functions. It was the current situation.

(Object of the Invention) In order to solve the above-mentioned problems, the present invention provides a cordless telephone device mainly used within the premises of a company's office.
By providing a means that allows a telephone to connect under specific conditions to a parent device other than the specific parent device connected to the telephone via a wireless line, the telephone can be connected to any one of the five slots in a call state. To provide a cordless telephone device which can secure a call even if it is carried from place to place if a vA device is present at a place that satisfies the call quality.

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

FIG. 1 shows a parent device 1 of a cordless telephone device according to the present invention.
and a plurality of telephones 2 are shown. In FIG. 1, the part on the left inside the dotted line is the parent device 1, and the call identification signal (
An ID memory storage holding section 1-1 for storing the IO signal (hereinafter referred to as IO signal) is provided in the parent device 1, and a calling information memory section 2-8 is provided in the telephone 2, and is connected to the control sections 1-3 and 2-3. By mutually transmitting the necessary control information, the following operations were made possible.

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

First, it is assumed that a call is made from the telephone tXI (A>2) on the right side of FIG. (When A > 2 is set to off-hook (call initiation) state, in this case, a calling signal consisting of ID information and a calling identification signal is sent from the control unit 2-3 to the transmitting unit 2-1 via the control channel. It is sent to the receiving section 1-2 of the device 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 etc.
Confirmation message @ (I
D signal) 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 1-4 to switch to a predetermined communication channel, and instructs the telephone (A) 2 to switch to this communication channel. In the telephone (A) 2, according to instructions from the parent device 1, the control unit 2-3 composed of a microcomputer or the like controls the synthesizer oscillator 2-7 to switch to the designated call channel, and the CH switching to the parent device 1 is completed. Send a signal. Therefore, after both parties check for an empty channel 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) 2 switches the switch circuit 2-5. -6
Turn on the communication circuit 2-4 to connect the receiving section 2-2 and the transmitting section 2.
-1, and the control unit 1-3 of the parent device 1 closes the DC loop for the central line using a DC closing circuit (not shown) disposed on the central line side of the hybrid circuit)-1. At this point, a dial tone is heard on the telephone (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 call is started according to the sequence shown in the figure.A call signal is transmitted between the office line and the transmitter 1-5 by turning on switches 1-6 and 1-7 under the control of the control unit 1-3. And transmission is performed between the receiving section 1-2 and the central office line.

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 parent device) However, when the telephone 2 that makes the call is a telephone (B) 2 that does not belong to the parent device 1, the identification (ID) included in the self-identification control signal ) information is stored in the parent device 1
Since it is different from the D information, in the conventional system, it was discarded and the call operation did not proceed. However, in the present invention, a new I
Since D memory storage section 1-1 is 82 digits, I
D information can be recorded, replaced, or deleted.

That is, if ID information of the telephone (B) 2 that does not belong to the parent device 1 (for example, an ID indicating that it belongs to the same company) is stored in this ID memory memory storage port 11, the ID memory memory The memory holding port 11 is connected to the control unit 1-
The calling operation from the telephone (B) 2 follows the same sequence as the previous telephone <A> 2 to enable a call.

However, if the ID information of the telephone (B) 2 is not stored (for example, the ID of another company), the ID memory storage/holding port 11 cannot be verified and the call operation is not started and ends at this point.

Note that the temporary storage circuit (
Set the maximum storage capacity as RAM), for example 10fl.
! ! If there is a request to store the 11th ID information, we will accept the request to store the 11th ID information, but if the old ID
It is also possible to take a method of sequentially erasing information, or to limit the memory retention period, such as -weeks, -days, etc. Furthermore, it is also possible to provide a lock function that does not erase part of the ID memory information once stored, but stores it until a special request is made.

In addition to this, the function of the ID memory storage section 1-1 housed in the parent device 1 can be such that a call can be made if a portion of the ID information matches.

This is the first 10 ID signals as shown in Figure 3.
One bit was used to identify the company name, and the remaining 10 bits were used to identify departments or individuals within the business! Taking into account the 14 configurations, for example, if a cordless phone within your company allows calls to be made from any cordless master device within the company, the first 10
It is sufficient to identify the bit, i.e. 'to identify the company, and simplification of the circuit configuration of the ID memory storage section 1-1.
It becomes efficient in shortening the time for calling operations.

(Changing the parent device as the phone moves) When you use a cordless phone while walking, the receiving input of radio waves becomes weaker as you move away from the parent device of the person you are talking to, and the quality of the call deteriorates. I can't make calls anymore. That is, when the distance from the parent device becomes 20R or more, the above phenomenon occurs. At this point, if there is another parent device within 20 meters of the telephone and the parent device is not in communication, the telephone will set up a new wireless line with the parent device and communicate with the other party in a short time. It is possible to allow the call to be interrupted for a certain period of time, but to allow the call to continue substantially.

FIG. 4 is a diagram showing the configuration in such a state, and shows a case where the calling telephone IXNA approaches the parent device 2 by walking while the wireless line is set up and the phone is talking to the parent device 1. ing. When telephone A moves further away from parent device 1 than in FIG. Then, the telephone A or the master device 1 starts the operation of disconnecting the wireless line. At this time, telephone A or parent device 1 sends a message via voice synthesis circuit (magnetic recording tape) 1-8 saying, ``The communication channel will be switched due to deterioration in line quality.''

Please hang up the handset and wait for a while.

If the phone rings again, please pick up the handset. ” etc. is sent to the other party (to a regular telephone). Naotoshi then sends a call termination signal from telephone A to parent device 1. Upon receiving this signal, the exchange enters call termination operation. (The subscriber line is restored.) At the same time, telephone A stops using the communication channel, and control C
H is used to send out the telephone number signal of the other party, which is stored in the calling information memory section (FIG. 1, 2-8) of the telephone, in addition to its own ID signal. This calling signal is received by the parent device 2 located near the telephone. At this time, the parent device 2 is not in the middle of a call, and the I of the telephone A that sent the call signal is
If it is determined that D is registered in the parent device 2 and that a call can be made and that a wireless communication path can be set and a successful conversation can be made, the telephone I
A call response signal addressed to the jMA is sent, and the telephone of the other party is called using the same signal flow as shown in FIG. 2, and the conversation can be continued. The signal flow based on the above operation is explained in the fifth section.
As shown in the figure.

The case where the parent device 2 exists alone in the vicinity of the telephone A has been described above, but the operation in the case where a plurality of parent devices exist in the vicinity of the telephone will be described.

In this case, the calling signal from telephone A in FIG. If this happens, there is a risk that it will be impossible to continue the call. In order to avoid this, it is possible to make it possible by setting a difference in the timing of the call response signals sent from each parent device and selecting circuit conditions so that while one is being sent, the other is not being sent.

(6. In the cordless telephone device of the present invention, the wireless line between the parent device and the telephone can be changed during a call only when a call is made from the cordless telephone □ or when a call is received to the cordless telephone. If a caller's phone number signal is being sent during a call, and this is received by the receiver of the phone and stored in memory, this information can be used to change the call path and complete the call in the same way as above. It is something that can be continued.

Furthermore, the present invention is generally applicable only to cordless telephone calls and cannot be applied to incoming calls, except when the calling party's telephone number information is stored by some method as described above. Considering that mobile calls account for an overwhelmingly higher proportion of calls than fixed-line telephone calls in physical communications, this point cannot be called a major disadvantage.

Although the present invention has been explained by exemplifying a cordless telephone device that accommodates a public line, it is obvious that it can also be applied to a cordless telephone device that accommodates a PBX such as a local exchange.

In addition, in the present invention, the communication path is temporarily disconnected and communication is not possible until the called telephone answers the call, but during this time, a voice synthesis circuit is used to soften the discomfort of the caller. It is possible to do so. Moreover, the time required for one part is a short time of several seconds to about 10 seconds, and there is no problem in practical use.

Furthermore, as a condition for continuous communication in the new device due to the switching of the communication channel explained above, the telephone IEIA I
D has already registered, but to simplify the system, I
Even if the configuration excludes the registration condition D, the object of the present invention can be sufficiently achieved.

(Effects of the Invention) By using the present invention as a substitute for a conventional cordless telephone device, even if you use the telephone while walking and move away from the parent device you were originally talking to, you can still make calls if there is another parent device nearby. In addition to being able to continue using the system, it is economical as there is no need to make any modifications to the system, and it greatly contributes to improving the work efficiency of the workplace.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing an example of a cordless telephone device using the present invention, FIG. 2 is a flowchart showing a call originating or receiving sequence of the cordless telephone device according to the present invention, and FIG. 3 is a cordless telephone device using the present invention. FIG. 4 is a block diagram showing an example of the ID signal of the present invention. FIG. 5 is a flowchart showing the operation when changing a communication channel according to the present invention. 1... Parent device, 1-1... ID memory storage holding section, 1-2... Receiving section, 1-3...
...Control unit, 1-4...Synthesizer oscillator, 1-5...Transmission section, 1-6.1-7...
...Switch, 1-8...Speech synthesis circuit, 2.
...Telephone, 2-1...Transmitter, 2-3
...Control unit, 2-4...Telephone circuit, 2
-5゜2-6...Switch, 2-7...
-Synthesizer oscillator, 2-8...Call information memory section. Patent applicant Iwasaki Tsushinki Co., Ltd.-2! 3rd =

Claims (1)

[Claims] A plurality of telephones and a plurality of sets of parent devices connected to the plurality of telephones via a wireless line and connected to an exchange or the like via a wired line share a plurality of wireless channels, and share identification information corresponding to the plurality of telephones. is stored in advance, and when the identification information is subsequently received from the telephone, the parent device sends a connection signal to the exchange, and the telephone is configured to be able to talk to a desired destination telephone. In a cordless telephone device, when the telephone that made the call sets up a wireless line with the corresponding parent device, and the call quality (received electric field level) drops below a certain standard as the telephone moves during a call, the telephone Temporarily interrupts the communication path of the telephone, sends out call information within this time, and selects a new master device that can ensure a certain level of call quality from among the multiple master devices existing near the telephone that receives this information. A cordless telephone device, characterized in that the telephone device is configured to set up a new wireless communication circuit with the new parent device to enable continuation of the conversation.