JP3810128B2 - Cordless telephone public base station - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cordless telephone public base station and its exchange, and more particularly, to a public base station in a simplified portable telephone system called PHS (Personal Handyphone System).
[0002]
[Prior art]
The standard of this type of telephone system is defined as “first generation RCR STD-28” issued by “Radio Wave System Development Center” as “second generation cordless telephone system”. The configuration of this system includes a mobile station or mobile phone called “RS” and a public base station called “CS”, and the mobile station is a land mobile radio between public base stations or between mobile stations. It communicates and is used as a communication terminal device for a subscriber, and includes a transmission / reception device, a voice encoding device, a handset, and the like. The public base station performs land mobile radio communication with a mobile station, and includes an antenna, a transmission / reception device, a voice encoding device, and the like.
[0003]
This type of system is time-division multiple access, and is excellent in that a radio line can be used efficiently when a large number of mobile stations exist within the communicable range of the base station.
[0004]
An incoming call sequence in such a cordless telephone will be described with reference to FIGS. In FIG. 4 and FIG. 5, the exchange 4 and the signal line for transmission / reception between the exchange 4 are shown redundantly in order to clarify the mutual relationship.
[0005]
First, when the desk phone 1 is picked up, the hook switch is closed, and the call setting signal 27 is transmitted to the exchange 2 in the service area to enter the call setting state. The exchange 2 is a subscriber (line) exchange 2 called LS (Local Switch), and transmits an oscillation sound of a predetermined frequency as a call setting acceptance signal 28 to the caller of the telephone 1. Next, when the calling party dials the other party (called party) number, this selection signal is transmitted via the exchange 2 to an in-network computer 3 called NSP (Network Service Control Point).
[0006]
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 current position of the mobile phone on the other side is within the communication range of the public base station to which the switch belongs. I have information about whether there is. Accordingly, the network computer 3 transmits the location information of the exchange 4 located on the other side to the exchange 2 based on the current location verification of the telephone 8.
[0007]
Next, the subscriber exchange 2 is connected to the exchange 4 for a line. The exchange 4 connected to the exchange 2 has a number of public base stations (first public base stations) 5, (second public base stations) 6, (third public base stations) within the communication range of the own equipment. 7, a call setup (UI) signal 20 is transmitted all at once, and then each base station 5, 6, 7 has a number of mobile phones (only one is shown) 8 within the communication range of each station 8. On the other hand, the incoming call signal 25 of the general call channel (PCH) is transmitted by radio.
[0008]
Here, since the mobile phone 8 is present in the communication area of the first public base station 5, it is transmitted from the phone 8 to the base station 5 by radio and shifts to outgoing / incoming connection control.
[0009]
Subsequently, a service channel establishment phase and a communication phase are provided. When the main signal is exchanged, a call control acceptance signal is transmitted from the telephone 8 to the base station 5.
[0010]
Next, a call signal 45 for call control is transmitted to the base station 5, and a series of sequential communication control signals are exchanged.
[0011]
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 caller's telephone 1 via the exchange 2, indicating that the call is currently being made. Notify the caller.
[0012]
Thereafter, when the telephone 8 is picked up, the line between the calling party and the called party is connected and a conversation is performed. During a call, a call control (CC) response signal 46 and a response confirmation signal 47 are exchanged between the telephone set 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 set 1.
[0013]
Such second generation cordless telephone public base stations 5, 6, and 7 have a so-called additional service function in which, when the mobile phone 8 cannot respond to the base station 5 for some reason, another base station makes a proxy response. The timeout of a response signal waiting timer from a mobile station such as the telephone 8 or the timeout of a special timer for starting an additional service is used as a control signal for starting such an additional service.
[0014]
[Problems to be solved by the invention]
Referring to the flowchart of FIG. 6 showing the problem in the proxy response activation procedure, when the base stations 5, 6, and 7 receive the call setting signal 20 from the exchange 4, they simultaneously start the additional service activation timer, In addition to the call setup acceptance signal 23, for example, the call setup acceptance signal 48 from the third public base station 7 within the time until the timer times out after a predetermined time, that is, the time from the time start 49 to the timeout 50. May be transmitted to the exchange 4, and a plurality of call setting acceptance signals are generated for the same telephone set 8.
[0015]
Here, for example, when the telephone 8 responds to the exchange 4 via the base station 5 other than the base station 7 that performs proxy response, a meaningless call setting acceptance signal 48 is transmitted from the proxy response base station 7. For this reason, the traffic on the line between the base station and the exchange 8 increases, and there is a problem in the construction in which the exchange 4 cannot hold many base stations.
[0016]
In view of the above-described problems, an object of the present invention is to provide a public base station that solves the following problems.
(1) To prevent a plurality of call setting acceptance signals from the same mobile phone from being transmitted to a common exchange.
(2) The exchange should be able to have more public base stations.
(3) Ensure that traffic between the public base station and the exchange does not rise.
(4) To add simple processing means.
[0017]
[Means for Solving the Problems]
The public base station of the cordless telephone of the present invention is connected to one exchange when there is no response when calling a cellular phone within the range in any base station based on a call setting signal from one exchange. In a public base station of a cordless telephone provided with an additional service function in which some public base stations respond as a proxy, a start timer that starts the additional service only after receiving the call setting signal a plurality of times from the one exchange Means to start.
[0018]
According to the present invention, 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. Compared to the conventional case of starting, a plurality of call setting acceptance signals are not received.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1 showing the flow of an embodiment of the present invention, a first call setting signal 20 is transmitted simultaneously from the exchange 4 to each of the base stations 5, 6, and 7, and a predetermined call setting reception waiting time is transmitted. If there is no response from the first public base station 5 where the mobile phone 8 is located for some reason, the second call setup signal 21 for the same phone 8 is again sent from the exchange 4 to each base station. Sent to 5, 6 and 7. When this second call setting signal 21 is received, for example, the base station 5 that makes a proxy response starts a timer for starting the additional service.
[0020]
That is, the timer start 18 stops the call setting acceptance waiting time, starts a timer for starting the additional service, and starts the additional service at the timeout 19.
[0021]
In this embodiment, a second call setting signal 21 is transmitted from the exchange 4 to each of the base stations 5, 6, and 7, and the second general call channel is transmitted from each of the base stations 5, 6, and 7 to each mobile phone. And a timer for starting the additional service is started. Other processing functions are the same as those of the prior art shown in FIGS.
[0022]
Referring to the flowchart of FIG. 2 showing the additional service activation state of each of the public bases 5, 6 and 7 in this embodiment, the main feature is that the judgment process S10 is interposed in a series of sequential control operations. Other control operations that are not shown in the figure are the same as those in the prior art.
[0023]
In the determination process S10, the public base stations 5, 6, and 7 do not start the additional service activation timer even if the first call setting signal 20 is received, and the second time for the same telephone set. For example, in the control process S11, the base station 5 that makes a proxy response starts the supplementary service activation timer and waits until the timer times out in the next determination process S12. The additional service is started in the control process S13.
[0024]
The determination process S10 is incorporated in a series of control programs, stored in a semiconductor memory element, and then mounted together with the CPU element or as a one-chip element.
[0025]
According to this embodiment, since only one processing step is added, it is not necessary to replace the conventional semiconductor memory element with an element having a larger storage capacity, and the redundant memory of the conventional element is used as it is. There is convenience that you can.
[0026]
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 process S14, the first call setting signal 20 is sent to each of the base stations 5, 6 and 7 as in the prior art. In the waiting time for receiving the call setting, for example, it is determined whether or not there is a call setting reception signal from the base station 5 in the determination process S15, and if there is no call setting reception signal (N), the next process In S16, the second call setup signal 21 is transmitted. When the call setup acceptance signal is received (Y), normal line connection is executed in process S17. In the process S16, when the reception signal is received after transmitting the second call setting signal, the process similarly proceeds to the process S17. That is, the exchange 4 is controlled not to activate the additional service when there is a response from any base station in the area.
[0027]
If there is a response from the telephone after transmitting the first call setting signal, the second call setting signal shown in FIG. 3 will not be transmitted, and naturally no additional service is required. .
[0028]
According to the embodiment described above, since the retransmission of the call setup signal is used as a condition for the activation factor of the additional service, the base station that makes a proxy response within a predetermined time called [T303] of the call setup acceptance waiting timer of the exchange 14 It is possible to confirm that there is no response from any other base station, and after performing this confirmation, a timer for starting the additional service can be started.
[0029]
Therefore, even though the base station receiving the response from the mobile phone transmits a call setting acceptance signal to the exchange, the call setting acceptance signal for starting the additional service is sent from the proxy response base station to the exchange. There is no transmission, and it is possible to prevent accidents that cause traffic to rise without meaning.
[0030]
In the above-described embodiment, the second call setting signal is transmitted and thereby the additional service activation timer is started. However, the second service setting timer is not limited to the second time. The additional service activation timer may be started by this. The telephone 1 may be a mobile phone in addition to the desktop type.
[0031]
【The invention's effect】
As described above, the public base station of the cordless telephone according to the present invention has an additional service function for performing a proxy response when there is no response even if a cellular phone in the area is not called based on a call setting signal from the exchange. The start timer for the additional service is started only after receiving a plurality of call setup signals from the exchange, so that a plurality of call setup acceptance signals from the same mobile phone are transmitted to a common exchange. Therefore, the traffic between the public base station and the exchange does not increase, the control process is simple, and there is an effect that it can be incorporated in a conventional mobile phone.
[0032]
In addition, the exchange for exchanging signals with the public base station of the cordless telephone of the present invention transmits the call setting signal for the mobile phone to a large number of public base stations in the area within a predetermined waiting time. When there is no response from the mobile phone, it has a function of sending the call setting signal one or more times to the base station, so that a plurality of call setting acceptance signals are transmitted from the same mobile phone. There is no need to worry about this, so that it is possible to have more public base stations in terms of configuration, and there is an effect that simple processing means can be added.
[Brief description of the 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 part of the processing procedure of the public base station in FIG. 1;
FIG. 3 is a flowchart showing a part of the processing procedure of the exchange in FIG. 1;
FIG. 4 is a flowchart showing the main signal flow on the calling and receiving sides of a conventional second generation cordless telephone system.
FIG. 5 is a flowchart showing the main signal flow on the called party side in FIG. 4;
6 is a flowchart showing problems between the exchange in FIG. 5 and a public base station.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Subscriber telephone 2, 4 Switch 3 Network computer 5, 6, 7 Public base station 8 Mobile telephone

Claims (1)

A response from a mobile phone within the range of the public base station is sent to any public base station of a plurality of public base stations connected to the exchange operating based on a call setup signal having the same content from one exchange. In a public base station of a cordless telephone having an additional service function in which a part of the public base station responds by proxy when there is no
A public base station for a cordless telephone, comprising: proxy response starting means for starting a timer for starting the additional service only after receiving a plurality of call setting signals from the one exchange .

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