KR20060078044A - Method for call transfer when out-of-range of terminal in dect wireless communication - Google Patents

Abstract

The present invention provides a method for transmitting a call during out-of-range of a terminal in DECT wireless communication, the first step of making the call is performed by the off-hook DECT terminal when a call from the opposite terminal to the DECT terminal; ; A second step of outputting an "out-of-range" message to the DECT terminal if the DECT terminal is out of the cell boundary after the first step, and determining whether the DECT terminal is moving within the cell boundary; A third step of maintaining a DECT call when the DECT terminal moves within a cell boundary in the second step; In the second step, if the DECT terminal does not move within the cell boundary, the fourth step includes performing a DECT call switching, so that the DECT terminal has an out-of-range warning message at a point where the strength of the radio signal is weak. In addition, the call is disconnected by CO line or linked-paired keyset by improving the call disconnection, and when the DECT terminal secures a good wireless environment, the original call is returned by using the call processing function. Will be able to improve.

Description

Method for call transfer when out-of-range of terminal in DECT wireless communication}

1 is a block diagram of a digital key phone system using a conventional DECT wireless communication,

2 is a flowchart illustrating a call transmission method when out-of-range of a terminal in a conventional DECT wireless communication,

3 is a block diagram showing the operation shown in FIG.

4 is a block diagram showing an example of automatic cell transmission of a DECT call in an out-of-range in a DECT wireless communication system to which the present invention is applied.

5 is a flowchart illustrating a call transmission method during out-of-range of a terminal in DECT wireless communication according to the present invention.

Explanation of symbols on the main parts of the drawings

10: Key Phone System

20: base station

30: terminal

40: VMS

The present invention relates to a method for transmitting an out-of-range call of a terminal in DECT (Digital Enhanced Cordless Telecommunications) wireless communication. Improved arc cutting with out-of-range warning messages at weak points, allowing calls to be relayed to Attendant KEYSET or Linked-pair keyset and the DECT terminal again In the out-of-range call transmission method of the terminal in the DECT wireless communication which is suitable to improve the DECT call quality by returning the original call by using the Recalling function when a good wireless environment is secured will be.

In general, DECT is a digital codeless telephone standard published and standardized in 1992 by the European Telecommunication Standards Institute (ETSI). It improves and evolves the Cordless Telephone-2 (CT-2), which was adopted in 1991 as the Interim European Standard (I-ETS), adding hand-over and automatic roaming, especially in large cities. It is a flexible, low-cost system standard for telepoint service or personal communication system (PCS) functionality in dense user areas.

1 is a block diagram of a digital key phone system using a conventional DECT wireless communication.

Here, reference numeral 10 denotes a key phone system (KP system), 20 denotes a base station for performing DECT wireless communication, and 30 denotes a terminal such as an attendant telephone, a keyphone telephone, or a wireless terminal.

Therefore, the digital key phone system is a kind of private exchange, which is an extension terminal (key phone, general telephone, DECT terminal, etc.) 30 and a public switching telephone network (PSTN) or ISDN (Integrated Services Digital) to which the terminals can connect. It consists of Central Office Line such as Network, Integrated Information and Communication Network.

Each terminal 30 may be assigned a unique number to request call connection between the terminals 30, and may be individually connected from an external trunk line.

To this end, the main processing unit in the key phone system 10 provides a call processing and voice switch function.

Here, the DECT terminal is a telephone that provides a wireless communication supplementary service to the key phone system 10. The DECT terminal can be given an extension number by itself, and a linked pair by being given a terminal number such as a key phone telephone that is a conventional wired terminal. It can also work as

That is, as shown in FIG. 1, the phone phone and the DECT wireless terminal may share an extension number (Station 119, hereinafter STA119).

Attendant KEYSET is a kind of switchboard telephone STA100, which is an extension keyphone telephone assigned to perform management or secretarial function of the system.

2 is a flowchart illustrating a call transmission method during out-of-range of a terminal in a conventional DECT wireless communication.

As shown in the figure, if a call setup request is made from a caller to a DECT terminal, the call is performed by the DECT terminal to make a call between the caller and the DECT terminal (ST1 to ST3); Outputting an "out-of-range" message to the DECT terminal when the DECT terminal is out of the cell boundary during the call, and determining whether the DECT terminal is quickly moved within the cell boundary (ST4) ~ ST6); Maintaining a DECT call when the DECT terminal moves within a cell boundary (ST7); If the DECT terminal does not move within the cell boundary, the step D8 of disconnecting the DECT call is performed.

The operation of the prior art configured as described above will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing the operation shown in FIG.

When the external terminal of CO (Central Office), internal wired telephone, or DECT terminal, Caller and DECT terminal are in a call, the user of DECT terminal moves toward the cell boundary or the DECT radio signal is severely affected by the surrounding environment. When shielded, the DECT terminal receives very weak radio signals.

Here, the caller refers to the terminal of the called party who called the DECT terminal.

At this time, the DECT terminal does not receive a normal call connection message from the system. (See ① in Figure 3)

If this situation persists, the DECT terminal displays an "Out-of-range" message and the call is disconnected (see ②-2 in FIG. 3).

If the DECT terminal user quickly moves to the point where the radio signal is good in the "out-of-rang" situation, the DECT terminal may exchange a normal call connection message with the system and the call connection may be maintained (2 in FIG. 3). 1).

However, this conventional technology has the following problems.

That is, when the DECT terminal is in the "Out-of-range" area, it is practically difficult to move quickly to the point where the radio signal is good, and in most cases, the DECT call is disconnected.

The "out-of-range" phenomenon can also be caused by sudden radio noise as well as cell boundaries.

This "out-of-range" phenomenon has not been properly addressed in the prior art.

Unexpected truncation of a DECT call can therefore have a very bad effect on call quality, and in this case there is a need for the ability to switch (transmit) the call to another location (such as an attendant phone or a linked paired keyphone phone).

Accordingly, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is to detect a phenomenon in which a DECT terminal is disconnected with an out-of-range warning message at a point where the strength of a radio signal is weak. DECT radio which can improve the DECT call quality by returning the original call by using the call processing function when the DECT terminal secures a good wireless environment by reproducing the call with the trunk line set or the linked-paired keyset. The present invention provides a method for transmitting a call during out-of-range of a terminal in communication.

In order to achieve the above object, the out-of-range call transmission method of the terminal in DECT wireless communication according to an embodiment of the present invention,

A first step of causing the DECT terminal to go off-hook by making a call from the opposite terminal to the DECT terminal; A second step of outputting an "out-of-range" message to the DECT terminal if the DECT terminal is out of the cell boundary after the first step, and determining whether the DECT terminal is moving within the cell boundary; A third step of maintaining a DECT call when the DECT terminal moves within a cell boundary in the second step; In the second step, if the DECT terminal does not move within the cell boundary, the technical configuration includes a fourth step of performing a DECT call conversion.

Hereinafter, an embodiment according to the present invention as described above with reference to the technical concept of the out-of-range call transmission method of the terminal in the DECT wireless communication as follows.

4 is a block diagram showing an example of automatic cell transmission of a DECT call in an out-of-range in the DECT wireless communication system to which the present invention is applied.

Here, reference numeral 10 is a key phone system (KP system), 20 is a base station for performing DECT wireless communication, 30 is a terminal such as an attendant phone, a key phone phone, a wireless terminal, 40 Is the Voice Mail Service (VMS).

5 is a flowchart illustrating a call transmission method during out-of-range of a terminal in DECT wireless communication according to the present invention.

As shown in FIG. 1, when the call is made from the opposite terminal to the DECT terminal, the first step (ST11) causes the DECT terminal to be off-hook to perform a call; Outputting an "out-of-range" message to the DECT terminal when the DECT terminal is out of the cell boundary after the first step, and determining whether the DECT terminal moves within the cell boundary. Two steps ST12 to ST14; A third step (ST15) of maintaining a DECT call when the DECT terminal moves within a cell boundary in the second step; In the second step, if the DECT terminal does not move within the cell boundary, a fourth step ST16 to ST27 is performed to perform DECT call switching.

The first step is characterized in that the ringing signal is sounded simultaneously to the linked paired DECT terminal and the key-phone telephone when the other terminal makes a call to the DECT terminal.

In the above, the fourth step includes the tenth step of performing a DECT call transfer to the attendant telephone.

In the tenth step, the key phone system 10 provides a voice mail service (VMS) that informs the caller that the call is being transferred, and transfers a call to the attendant phone (“Xfer to Attendant”). An eleventh step (ST16 to ST18) for calling with and determining if there is a response from the attendant telephone; In the eleventh step, if there is a response from the attendant telephone, the attendant telephone requests an internal call to check whether the state of the DECT terminal is good, and if the DECT terminal answers, the call is switched back to the original call. A twelfth step ST19 to restore the furnace; In the eleventh step, if there is no response from the attendant telephone, a thirteenth step (ST25 to ST27) of transmitting an abnormal call disconnection message to the counterpart terminal and then disconnecting the call is performed.

In step 12, if the DECT terminal responds, the method may include calling the DECT terminal or calling a linked-paired keyphone to switch the call and then recovering the original call if necessary. do.

The thirteenth step may include storing information related to the caller terminal in a database of the key phone system 10 after the call is disconnected.

The fourth step above includes a twenty step of performing a DECT call transfer to a linked paired telephone.

In the 20th step, the key phone system 10 provides the VMS to notify the caller of a call transfer, and a short message (“Xfer to Linked Pair”) indicating a call transfer to the linked paired telephone. A twenty-first step (ST16) (ST21) (ST22) of calling together to determine whether there is a response from the linked paired telephone; In step 21, if there is a response from the linked-paired telephone, the linked-paired telephone requests an internal call to check whether the DECT terminal is in good condition, and if the DECT terminal answers, the call is switched again. A twenty-second step (ST23) (ST24) of restoring a call path; If there is no response from the linked-pair telephone in the twenty-first step, it performs a twenty-third step (ST25 ~ ST27) to send an abnormal call disconnect message to the opposite terminal and then disconnect the call.

The twenty-second step may include performing a call transfer immediately if the linked-pair telephone is set to a hands-free response mode.

In the twenty-third step, after the call is disconnected, information related to the caller terminal (Caller) may be stored in a database of the key phone system 10.

The operation of the out-of-range call transmission method of the terminal in the DECT wireless communication according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention improves the phenomenon that the DECT terminal is disconnected with the out-of-range warning message at the point where the wireless signal is weak, so that the call is relayed to the trunk line keyset or the linked-paired keyset, and the DECT terminal is again good. When the wireless environment is secured, the original call is returned using the call processing function to improve the DECT call quality.

In FIG. 4 and FIG. 5, the DECT Base station is a device for connecting a wireless terminal, and provides a constant callable area (which is called a cell) by the strength of a radio frequency (RF).

In addition, the Attendant KEYSET (exchange telephone) is an attendant telephone for management and operation of the key phone system 10.

Also, Linked Pair refers to a linked pair of a DECT terminal and a key phone, which means using the same extension number for the wired / wireless extension telephone.

In addition, the VMS (Voice Mail Service) is a device that provides various guide messages.

In addition, the DECT Call refers to a call between a caller (Caller) and a DECT wireless terminal.

Also, a caller refers to a counterpart terminal calling a DECT terminal, and may correspond to an external caller and an extension terminal coming into a trunk line.

Attendant also means an attendant (secretary).

Xfer stands for Transfer, which means transfer.

Caller-ID also stands for Caller Identification Number.

Referring to the operation of the present invention in more detail as follows.

First, the caller on the other side (assuming an external caller) calls extension number STA119.

Then, a ring signal sounds simultaneously to the linked pair DECT terminal STA119 and the key phone telephone STA119.

The DECT terminal is off-hook.

In this case, the call path is formed as shown by ⓐ in FIG. 4 (ST11).

During this call, the state of the wireless environment is changed to "out-of-range" state (ST13) by the change of the wireless environment (movement or ambient noise) (ST12).

Then, the main controller of the key phone system 10 detects that the current state of the DECT terminal is a state of disconnection of a call connection message due to a poor wireless environment rather than the end of a normal call (ST14).

At this time, the switching unit of the key phone system 10 continues to maintain the call path from the other side phone.

If the DECT terminal moves quickly within the cell boundary, it maintains the DECT call (ST15).

If the DECT terminal does not move quickly within the cell boundary, it operates as follows.

First, if a DECT call transfer is programmed from the switchboard telephone into the switchboard telephone, do the following:

1) The key phone system 10 calls the attendant phone with the call transfer short message (" Xfer to Attendant ") while providing a VMS to the other party's phone indicating that the call is being transferred (ST17).

2) The attendant telephone is called (ST18), and when the attendant telephone answers, the attendant telephone receives the transferred call and talks with the external counterpart telephone.

Call connection in this case is the same as ⓑ in FIG.

3) The attendant requests an internal call to check whether the DECT terminal is in good condition, and when the DECT terminal answers, it switches back and restores the original channel (ST19). In addition, if necessary, the call may be restored after calling a DECT terminal or a linked-pair keyphone telephone (ST20).

4) If the attendant phone does not receive the diverted call, it transmits an abnormal call disconnect message (ST25) and then disconnects the call connected to the DECT terminal (ST26). If necessary, information related to the other party phone is stored in the database of the key phone system 10 (ST27).

On the other hand, if a DECT call transfer is programmed from a switched telephone to a linked pair telephone, proceed as follows:

1) The key phone system 10 provides a VMS indicating that the call is being transferred to the other party's phone and simultaneously calls the linked paired phone with a short message (“Xfer to Linked Pair”) indicating the call transfer (ST21).

2) Calling the linked paired telephone (ST22), if there is a response from the linked paired telephone, the linked paired telephone receives the transferred call and talks with the external counterpart telephone.

Call connection in this case is the same as ⓒ in FIG. 4.

3) The linked paired phone requests an extension call to check whether the state of the DECT terminal is good, and when the DECT terminal answers, the call is switched again to recover the original call path (ST23 (ST24)).

When a linked paired phone is set to hands-free answering mode, the call is transferred immediately.

4) If the linked paired telephone does not receive the diverted call, it transmits an abnormal call disconnect message (ST25) and then disconnects the call connected to the DECT terminal (ST26). If necessary, information related to the other party phone is stored in the database of the key phone system 10 (ST27).

As such, the present invention improves the phenomenon in which the DECT terminal is disconnected with the out-of-range warning message at the point where the wireless signal is weak, thereby relaying the call to the CO line key set or the linked-pair keyset, and the DECT terminal is again good. When the wireless environment is secured, the original call is returned using the call processing function to improve the DECT call quality.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the out-of-range call transmission method of the terminal in the DECT wireless communication according to the present invention, the call is disconnected with the out-of-range warning message at the point where the DECT terminal has a weak radio signal strength. It is possible to improve the DECT call quality by returning the original call using the call processing function when the DECT terminal secures a good wireless environment by reproducing the call with the CO line or linked-pair keyset. Will be.

Here, the disconnection of the call due to the change of the radio signal in the wireless communication environment may occur at any time. Therefore, in the present invention, the DECT terminal avoids a phenomenon in which the call is immediately disconnected even in an "out-of-range" situation, and provides a function of switching to an attendant telephone or a linked pair telephone, thereby improving DECT call quality. The effect is to eliminate potential user complaints.

Claims (10)

A first step of causing the DECT terminal to go off-hook by making a call from the opposite terminal to the DECT terminal; A second step of outputting an "out-of-range" message to the DECT terminal if the DECT terminal is out of the cell boundary after the first step, and determining whether the DECT terminal is moving within the cell boundary; A third step of maintaining a DECT call when the DECT terminal moves within a cell boundary in the second step; If the DECT terminal does not move within the cell boundary in the second step, the method comprising the fourth step of performing a DECT call switching is carried out, characterized in that performing the out-of-range call transmission method of the terminal in the DECT wireless communication . The method of claim 1, wherein the first step, When a call is made from the opposite terminal to the DECT terminal, a ring signal sounds simultaneously to the linked paired DECT terminal and the key-phone telephone, and the out-of-range call transmission method of the terminal in the DECT wireless communication, comprising: . The method of claim 1, wherein the fourth step, And a tenth step of performing a DECT call transfer to an attendant telephone. 10. A method of transmitting an out-of-range call of a terminal in a DECT wireless communication. The method of claim 3, wherein the tenth step is A keyphone system, providing an VMS informing the counterpart terminal that a call is being transferred, and calling an attendant telephone with a call transfer short message to determine whether there is a response from the attendant telephone; In the eleventh step, if there is a response from the attendant telephone, the attendant telephone requests an internal call to check whether the state of the DECT terminal is good, and if the DECT terminal answers, the call is switched back to the original call. Recovering the furnace; And if the answering telephone is not answered in the eleventh step, a step 13 of transmitting an abnormal call disconnection message to the counterpart terminal and then disconnecting the call. How to send a call during over-range. The method of claim 4, wherein the twelfth step comprises: When the DECT terminal responds, if necessary, calling the DECT terminal or calling a linked paired telephone phone to switch the call and then recovering the original call. How to send a call when out of range. The method of claim 3, wherein the thirteenth step is And storing information related to the other party's terminal in a database of the keyphone system after the call is disconnected. 7. The method of claim 1, wherein the fourth step comprises: And a 20th step of performing a DECT call transfer to a linked paired telephone. The method of claim 7, wherein the twentieth step, A twenty-one step of providing a VMS informing the called party of a call transfer and calling a linked paired telephone with a short message informing of a call transfer to determine whether there is a response from the linked paired telephone; In step 21, if there is a response from the linked-paired telephone, the linked-paired telephone requests an internal call to check whether the DECT terminal is in good condition, and if the DECT terminal answers, the call is switched again. A twenty-second step of recovering the currency of the; And if there is no response from the linked-paired telephone in step 21, transmitting a abnormal call disconnection message to the counterpart terminal and then disconnecting the call. How to send a call on-range. The method of claim 8, wherein the twenty-second step is And if the linked paired phone is set to the hands-free answering mode, performing a call transfer immediately. The method of claim 8, wherein the twenty-third step, And storing information related to the other party's terminal in a database of the keyphone system after the call is disconnected.

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