JPS62295528A - Control method for cordless telephone set - Google Patents

Abstract

PURPOSE:To attain outgoing/incoming call without causing confusion by applying m:n (m, n are plural numbers)connection control to radio connection devices and telephone sets while plural cordless telephone sets are placed in an overlap zone of plural service areas. CONSTITUTION:Two cordless telephone sets la, 1b exist in the overlap zone of the radio connectors 2a, 2b and send and receive a signal from any of the connectors 2a, 2b. A radio line controller 3 is connected with the controllers 2a, 2b by a relay line interface (selection signal transmission/ reception), and connected to extensions of a PBX exchange 4 by a subscriber interface (bell signal incoming, telephone set dial signal sending). The extension side viewed from the PBX exchange 4 is regarded as the same for cordless telephone sets and general telephone sets, and extension terminals 1a, 1b, correspond to cordless telephone sets la, 1b. Further, the radio line controller 3 applies traffic control for the outgoing/ incoming call for the cordless telephone sets.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method for controlling incoming calls to a plurality of cordless telephones existing in overlapping service areas (zones) of a plurality of wireless connection devices. In this system, the received electric field level from the cordless telephone measured by the wireless connection device at the time of a call is stored in the upper wireless line control device, and when a call is received, the wireless connection device with the highest received electric field level is connected to the wireless connection device. The feature is that incoming connections can be made by selecting a route.

(Prior art) As a method of controlling incoming calls to mobile terminals, a base station calls all mobile stations simultaneously, compares the level of the received electric field from the terminal at each base station, and uses a wireless base that shows the highest level. Technology for making incoming calls using stations has been put to practical use in car telephones.

This is because cars are constantly moving, so it is necessary to check the current location every time a call is received.

A cordless phone is considered to be a form in which part of the conventional telephone line has been made wireless, and a wireless connection device (base station or master station)
There was a one-to-one correspondence between the station and the telephone, and it was possible to move the phone within the same zone (approximately 20 meters). However, it is expected that problems will occur in the future when telephones are used in places with a high density of installations or when they are moved to other zones, and there is a need for technology that can meet these new demands. However, unlike a car, a cordless phone is not used for making calls while constantly moving, so it can meet the above requirements with a simpler control method than in the case of a car.

(Specific purpose of the invention) When introducing a cordless telephone in a place where there are many PBX extension telephones, such as on the premises of a business office, it is necessary to use a cordless telephone because of the high density of telephones and the need to move the telephones, for example, by bringing them into a conference room. For example, the relationship between the wireless connection device and the telephone should not be 1:1, but multiple cordless telephones should be present in the overlamp zone of multiple service areas (m:n) (m, n
It is desirable to control connections based on the relationship between multiple devices and to enable movement.

In the present invention, a radio line control device that performs connection control of incoming and outgoing calls without confusion is provided at the top of the system and on the extension side of a PBX (private branch exchange) exchange, so that the above-mentioned new The purpose is to enable the introduction of functional cordless telephones into offices, etc.

(Configuration of the Invention) FIG. 1 is a side view of the configuration of a cordless telephone system embodying the present invention. It is assumed that the two cordless telephones 1a and 1b exist within the overlap zone of the wireless connection devices 2a and 2b, and calls can be made and received from either 2a or 2h. 3 is a radio line control device, which is connected to 2a, 2b, etc. through a trunk line interface (selection signal transmission/reception). Also, the extension subscriber circuit and subscriber interface of the PBX exchange 4 (incoming bell signal, sending out telephone dialing signal)
connected with. 5 is a general telephone set with cable accommodation. The extension side viewed from the PBX exchange 4 is exactly the same for both cordless and regular telephones, with extension terminals 1a' and lb"
corresponds to cordless telephones 1a and lb. Furthermore, the radio line control device 3 is a device that performs traffic management and control for outgoing and incoming calls from a cordless telephone.

FIG. 2 is a diagram showing the format of information when the cordless telephone 1a makes a call. IDa (individual identification information) is sent from 1a to the wireless connection devices 2a and 2b, and from each of 2a and 2b to the wireless line control device 3. To IDa, the received electric field level (abbreviated as the level below the received intensity) La.

Add Lb and send. 3 performs connection control using La and Lb as indicators, but preferentially uses a route with a high level of connection.

Individual identification information (11)a, IDb, etc.) is multi-digit data that is separate from the telephone number given to each system and is used to recognize a single terminal independently of the system. This is to prevent connection theft, interference, etc. in the wireless section, and is used to control connections in the wireless section. Note that FIG. 3 shows an example of writing in the TD (individual identification information) memory provided in the radio line control device 3, which will be explained in the next section.

(Operation of the Invention) (A) FIG. 4 is a diagram showing the flow of information when the cordless telephone 1a makes a call and the method of storing it in the wireless line connection device 3, and the operation when making a call will be explained using this diagram.

1) When the cordless telephone 1a goes off-hook, the wireless connection devices 2a and 2b receive IDa.

2) 2a and 2b are the respective calling signals La+IDa and Lb+ID with the electric field level added to the received IDa.
Send a to 3.

3) In 3, La and Lb are compared, and if La>Lb is taken as an example, 2a and 2b are stored in the memory la in this order.

4) 3 sends a response signal (ANS) to 2a corresponding to La. After that, proceed with the connection operation.

5) 3 sends a rejection response (NOK) to 2b, and
Cut the root of h.

(B) When the cordless telephone 1b makes a call after the cordless telephone 1a ends the call, the calls 2a and 2b are stored in the memory 1b of the radio line control device 3 in the order shown in FIG. 5 in the same manner as in (A).

(C) FIG. 5 is a diagram showing the connection route and information flow when a call arrives at the cordless telephone 1a during an incoming call on the cordless telephone 1b.The operation at the time of receiving a call will be explained with reference to this diagram.

1) A call is received from the PBX exchange 4 to the cordless telephone 1b.

2) The wireless line control device 3 selects the memory with a high check level, for example 2a, and transfers it to the wireless connection device 2a.
Send Db.

3) 2a sends the IDb received from 3 to the wireless line and establishes a connection with the cordless telephone 1b.

4) Assume that there is an incoming call to another cordless telephone 1a during the call in 3).

5) Device 3 examines its memory, and the higher level 2a is 1
Since b is in use, the second highest level 2b is selected and IDa is sent to 2b.

6) The wireless connection device 2b connects the cordless telephone 1a with IDa.
After that, the connection operation will proceed.

(D> As described above, both outgoing and incoming calls use the route with the highest received electric field level, but in the case of (B), 1a
If 1b makes a call during a call, it will be controlled by the route of 2b,
Also, only 2b is stored in the memory of 3, so that if there is an incoming call to 1b, it will be connected via 2h.

(Effect of the invention) Implementation of the present invention provides a plurality of wireless connection devices (2a).

Even if there are multiple cordless telephones (1a, 1b, -) within the overramp service zone (2b, -), it is possible to make and receive calls without causing confusion, and each Since the data is written to the 10 memory of the line control device 3, the cordless telephone can move to a service area of a wireless connection device different from its current location and make a call. For this reason, it will be easy to make cordless PBX extensions in offices, etc., and its introduction will be promoted.

[Brief explanation of the drawing]

Fig. 1 is a side view of the configuration of a cordless telephone system embodying the present invention, Fig. 2 is a diagram showing the format of information when the cordless telephone 1a makes a call, and Fig. 3 is an individual identification provided in the wireless line controller W3. Figure 4 shows the flow of information when the cordless telephone 1a makes a call and how it is stored in the wireless line control device 3. Figure 5 shows an incoming call to the cordless telephone 1b. Cordless phone 1 inside
FIG. 3 is a diagram showing a connection route and information flow when a call arrives at a destination a. la, lb...cordless telephone, 2a, 2b.
...Wireless connection device, 3...Wireless line control device, 4...
・PBX exchange, ID...Individual identification information. 0. 0 @A -Kari0 lko1'Q χ''

Claims (1)

[Claims] A plurality of cordless (wireless) telephones, and a plurality of wireless connection devices connected to these telephones via wireless lines and connected to a wireless line control device via wired lines to convert connection control signals between the telephones and the devices. and a cordless telephone system configured by a wireless line control device connected to an exchange through a subscriber line and connected to all said wireless connection devices in the system through relay lines, wherein the service zones of the plurality of wireless connection devices overlap. When any one of the plurality of cordless telephones existing in the area sends out a calling signal that includes the telephone's individual identification information, the plurality of wireless connection devices that receive this call signal will add the reception strength to the telephone's individual identification information. The calling signal with the attached call signal is sent to each wireless line control device, and the wireless line control device connects to the wireless connection device with the highest reception strength that satisfies the call quality, and receives the wireless connection device that accepted the call. The reception strength is stored in an internal storage file, and if a call is received by one telephone in the overlapping service zone area, the reception strength is transmitted to another cordless telephone from the information of the telephone whose reception strength is stored in the storage file. A method for controlling a cordless telephone, characterized in that an unused wireless connection device having the highest reception strength is selected and an incoming call is connected.