JPH09271073A - Public base station for cordless telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent plural call setup signals from being sent to a common exchange by starting a start timer stating additional service after plural call setup signals are received from the exchange. SOLUTION: A 1st call setup signal 20 is sent simultaneously to base stations 5, 6, 7 from an exchange 4, and when no reply comes from the 1st public base station 5 in the zone of which a portable telephone set 8 due to any cause within a prescribed call setup wait time, the exchange 4 sends again a 2nd call setup signal 21 with respect to the same telephone set 8 to the base stations 5, 6, 7. Upon the receipt of the 2nd call setup signal 21, for example, the base station 5 conductive delay delivery service starts a timer to start the additional service. That is, the setup reception wait time is stopped at a timer start time 18 and a timer to start the additional service is started and the additional service is started at a time-out time 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a public base station of a cordless telephone and its exchange, and more particularly to a PHS (Person).
al Handyphone System) is a public base station in a simple mobile phone system called.

[0002]

2. Description of the Related Art This type of telephone system is referred to as "First Generation RCR STD-2" issued by "Radio System Development Center" as "Second Generation Cordless Telephone System".
8 ”and the like, the standard is defined. The configuration of this system includes a mobile station or mobile phone called "RS" and a public base station called "CS". The mobile station is a land mobile radio between the public base station or between mobile stations. It performs communication and is used as a subscriber's communication terminal device, and is provided with a transmitting / receiving device, a voice encoding device, a handset, and the like. Further, the public base station performs land mobile radio communication with the mobile station and includes an antenna, a transmitting / receiving device, a voice encoding device, and the like.

This type of system is time-division multiple access, and is excellent in that the wireless line can be used efficiently when a large number of mobile stations exist within the communication range of the base station.

An incoming sequence in such a cordless telephone will be described with reference to FIGS. 4 and 5. 4 and 5, the exchange 4 and the signal lines for transmission and reception between the exchange 4 are duplicated in order to clarify the mutual relation.

First, when the desk phone 1 is taken up, the hook switch is closed, and the call setting signal 27 is transmitted to the exchange 2 within the area.
To the call setup state. The exchange 2 is LS (Lo
Call switching acceptance signal 28 is generated by the subscriber (line) switch 2 called a calSwitch) and the telephone 1 generates an oscillating sound of a predetermined frequency.
To the calling party. Next, when the caller dials the other party (callee) number, this selection signal is transmitted to the computer 3 in the network called NSP (Network Service Control Point) via the exchange 2.

The network computer 3 is a dedicated computer that has a function that is frequently changed in order to realize an advanced communication service. Here, the exchange of which the present location of the mobile telephone of the other party belongs to a public base station to which the exchange belongs. The information on whether it is within communication range is grasped. Therefore, the network computer 3
Transmits the position information of the exchange 4 located in the other party to the exchange 2 based on the current position comparison of the telephone 8.

Next, a line is connected to the subscriber exchange 2 and the exchange 4. Exchange 4 connected to exchange 2
Calls all the public base stations (first public base station) 5, (second public base station) 6, (third public base station) 7 within its own communication range all at once. The base station 5, 6 and 7 transmits a setting (UI) signal 20, and then each base station 5, 6 and 7 sends a paging channel (to one of a plurality of mobile phones (only one is shown in the figure) 8 within its communication range. The incoming call signal 25 of PCH) is wirelessly transmitted.

Here, since the mobile telephone 8 is present within the communication area of the first public base station 5, the mobile telephone 8 is wirelessly transmitted from the telephone 8 to the base station 5 to shift to the incoming / outgoing call connection control.

Subsequently, a service channel establishing phase and a communication phase are provided. When the transfer of the main signal is shown, a call control acceptance signal is transmitted from the telephone 8 to the base station 5.

Next, a call control call signal 45 is transmitted to the base station 5, and a series of sequential communication control signals are exchanged.

Subsequently, a call signal 31 is transmitted from the base station 5 to the exchange 4, and the exchange 4 transmits a call signal 36 to the telephone set 1 of the calling party via the exchange 2 and is currently calling. Notify this caller.

After that, when the telephone 8 is picked up, the line between the calling party and the called party is connected, and discussion is carried out. At the time of a call, a call control (CC) response signal 46 and a response confirmation signal 47 are exchanged between the telephone 8 and the first public base station 5, and even between the first public base station 5 and the exchange 4. The response signal 32 and the response confirmation signal 33 are exchanged, and the response signal 37 and the response confirmation signal 38 are also exchanged between the exchange 2 and the telephone 1.

In the second-generation cordless telephone public base stations 5, 6 and 7 as described above, when the mobile telephone 8 cannot respond to the base station 5 for some reason, another base station makes a proxy response, a so-called additional service function. Using a time-out of a response signal waiting timer from a mobile station such as the telephone 8 and a time-out of a special timer for starting an additional service as a control signal for starting such an additional service. There is.

[0014]

Referring to the flowchart of FIG. 6 showing the problem in the procedure for activating the proxy response, the base stations 5, 6 and 7 are provided with the call setup signal 20 from the exchange 4.
In response to the call setting acceptance signal 23, the additional service activation timers are all started at the same time, and the timers time out after a predetermined time, that is, within the period from the time start 49 to the timeout 50. An accident may occur in which the call setup acceptance signal 48 from the public base station 7 of No. 3 is transmitted to the exchange 4, and a plurality of call setup acceptance signals are generated for the same telephone 8.

Here, for example, when the telephone set 8 responds to the exchange 4 via the base station 5 other than the base station 7 which responds by proxy, a meaningless call setting acceptance signal 48 is transmitted from the proxy response base station 7. As a result, the traffic of the line between the base station and the exchange 8 rises, and there is a structural problem that the exchange 4 cannot hold many base stations.

In view of the above problems and the like, an object of the present invention is to provide a public base station which solves the following problems. (1) Prevent multiple call setting acceptance signals from the same mobile phone from being sent to a common exchange. (2) To allow the exchange to own more public base stations. (3) Make sure that the traffic between the public base station and the exchange does not rise. (4) A simple processing means should be added.

[0017]

A public base station for a cordless telephone according to the present invention is based on a call setup signal from a switch.
It has an additional service function that responds by proxy when there is no response even when calling a mobile phone in the area, and starts an activation timer that starts the additional service only after receiving the call setting signal from the exchange multiple times. Equipped with means.

According to the present invention, since it is possible to confirm that the call setup signal has not been received within a predetermined time after the first call setup signal is transmitted, it is not necessary to perform the confirmation. Compared to the conventional method of starting additional services immediately,
It is possible to avoid receiving a plurality of call setting acceptance signals.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Referring to FIG. 1 showing a flow of an embodiment of the present invention, a first call setting signal 20 is transmitted from an exchange 4 to each base station 5, 6, 7 all at once. If there is no response from the first public base station 5 in which the mobile phone 8 is located for some reason within the predetermined call setup reception waiting time, the second call setup signal 21 for the same phone 8 is sent.
Is transmitted from the exchange 4 to the base stations 5, 6, and 7 again.
When receiving the second call setting signal 21, for example,
The base station 5 responding by proxy starts a timer for activating the supplementary service.

That is, in the timer start 18, the call setting acceptance waiting time is stopped, the timer for starting the supplementary service is started, and at the time-out 19, the supplementary service is started.

In this embodiment, the exchange 4 transmits the second call setting signal 21 to each of the base stations 5, 6 and 7,
A second incoming call signal of the paging channel is transmitted from each base station 5, 6, 7 to each mobile phone, and a timer for starting the additional service is started. Since the other processing functions are common to those of the conventional techniques shown in FIGS. 4 and 5,
The description is omitted.

Each public base station 5 in this embodiment
Referring to the flowchart of FIG. 2 showing the additional service activation states of 6 and 7, the main feature is that the determination process S10 is interposed among a series of sequential control operations, and the other features not shown. The control operation is the same as the conventional one.

The public base stations 5, 6 and 7 make a judgment process S10.
In, even if the first call setting signal 20 is received,
None of them starts the supplementary service start timer, and the second call setting signal 2 for the same telephone is set.
For example, the base station 5 that responds by proxy starts the supplementary service activation timer in control processing S11 after receiving 1 and waits until this timer times out in the next determination processing S12, and then the next control processing S13. Start additional service with.

The determination process S10 is incorporated in a series of control programs, stored in a semiconductor memory device, and then mounted together with a CPU device or as a one-chip device.

According to this embodiment, since only one processing step is added, there is no need to replace the conventional semiconductor memory element with an element having a larger storage capacity, and the redundant memory of the conventional element can be replaced. It has the convenience that it can be used as it is.

On the other hand, referring to the flowchart of FIG. 3 showing the control state of the exchange 4 in this embodiment, first, in the control processing S14, the first call setting signal 20 is sent to each of the base stations 5, 6 as in the conventional case. , 7, and within the waiting time for call setting acceptance, for example, it is judged in the judgment processing S15 whether or not there is a call setting acceptance signal from the base station 5, and if there is no call setting acceptance signal (N), In the next process S16, the second call setting signal 21 is transmitted, but when the call setting acceptance signal is received (Y), the normal line connection is executed in process S17. When the reception signal is received after the second call setting signal is transmitted in the process S16, the process similarly shifts to the process S17. That is, the exchange 4 controls so that the supplementary service is not activated when a response is received from any base station in the area.

If a response is received from the telephone after the first call setting signal is transmitted, the second call setting signal shown in FIG. No need.

According to the above-described embodiment, since the retransmission of the call setting signal is used as the condition for the activation factor of the supplementary service, the call setting acceptance waiting timer [T303] of the exchange 14 is used.
It is possible to confirm that there was no response from the base stations other than the proxy responding base station within the predetermined time called
After making this confirmation, the timer for starting the supplementary service can be started.

Therefore, even though the base station which has received the response from the mobile phone transmits the call setting acceptance signal to the exchange, the proxy response base station calls the call setting acceptance signal for starting the additional service. Is not transmitted to the exchange, and it is possible to prevent an accident that would increase traffic without meaning.

In the above-described embodiment, the call setting signal for the second time is sent to start the supplementary service start timer, but the present invention is not limited to the second time, and the call for a plurality of other calls is not limited to this. A setting signal may be sent to start the supplementary service activation timer. Further, the telephone 1 may be a mobile telephone in addition to the desk top type.

[0031]

As described above, the public base station of the cordless telephone according to the present invention is an additional service which, based on the call setting signal from the exchange, makes a proxy response when the mobile telephone in the area is not answered. Since it has a function and starts the supplementary service start-up timer only after receiving call setting signals from the exchange a plurality of times, a plurality of call setting acceptance signals from the same mobile phone are common to the exchange. Therefore, the traffic between the public base station and the exchange does not increase,
In addition, the control process is simple and can be incorporated into a conventional mobile phone.

Further, the exchange for exchanging signals with the public base station of the cordless telephone of the present invention transmits a call setting signal to the mobile telephone to a large number of public base stations in the area, and waits for a predetermined waiting time. If there is no response from the mobile phone, it has a function to send the call setup signal to the base station one or more times. Since there is no concern that data will be transmitted, more public base stations can be possessed due to the configuration, and there is an effect that a simple processing means can be added.

[Brief description of drawings]

FIG. 1 is a flowchart showing main signal flows in a base station according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of a part of the public base station in FIG.

FIG. 3 is a flowchart showing a processing procedure of a part of the exchange in FIG.

FIG. 4 is a flow chart showing the main signal flow on the calling and called sides of a conventional second-generation cordless telephone system.

5 is a flow chart showing the main signal flow on the called party side of FIG. 4;

FIG. 6 is a flowchart showing a problem between the exchange and the public base station in FIG.

[Explanation of symbols]

 1 subscriber telephones 2, 4 exchanges 3 computers in the network 5, 6, 7 public base stations 8 mobile telephones

Claims (1)

[Claims] 1. A public base station of a cordless telephone having a supplementary service function that responds by proxy when there is no response even when a mobile telephone within the area is called based on a call setting signal from the exchange, a plurality of times from the exchange. A public base station for a cordless telephone, comprising means for starting an activation timer for activating the supplementary service only after receiving the call setting signal.