KR100251727B1 - Method for displaying cause of failed call in ct2 - Google Patents

Abstract

PURPOSE: A method for displaying a cause of a telephone call failure in a second generation cordless telephone is provided to enable a user to deal with the failure quickly, by illustrating the cause thereof on a liquid crystal display. CONSTITUTION: It is checked whether a phone call key is inputted(201). The reception of a multiplex signal pattern is checked, and thereby it is determined whether a link is formed(203). If the pattern is received and then a phone call path is formed, the first link status message is displayed(205). An active mode for applying power supply to a radio frequency part is set so that a telephone call can start(207). If the phone call path is not formed, the second link status message is displayed(209). An active mode is set(211). When a predetermined time passes(213), a standby mode of a terminal is set(215). A channel scanning time interval is checked(217). According to the time interval checked, the message related to the cause of the telephone call failure is displayed(219,221).

Description

How to indicate the cause of a call failure in next-generation digital cordless phones

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an error display method of a next generation digital wireless telephone, and more particularly, to a call failure cause display method of displaying a cause of a call failure on a liquid crystal display (LCD) when a call fails.

With the development of current communication technology, the call distance of home cordless telephones has been extended to be used within a certain distance as well as indoors. Also, with the development of mobile communication technology, next generation digital cordless telephones (hereinafter referred to as "CT2") have emerged. The CT2 is a transmission-only communication terminal, which communicates using a public base station called a telepoint or a home base station in which the telepoint is added to a main body of a radio telephone. The call range of the CT2 terminal is 200 meters in the radius where the telepoint is installed, and the number of channels has 40 channels for one telepoint. Therefore, if the CT2 terminal is out of the call range or the channel is occupied by another CT2 terminal, the CT2 terminal cannot make a call. In this case, the CT2 terminal outputs only a specific message (eg, "NO SERVICE") to the liquid crystal display, and does not indicate what is causing the call failure.

As described above, when the CT2 terminal user needs to make a call for urgent business, wait for the other CT2 terminal user's call to finish and try to re-call, or the CT2 terminal user moves to the base station where the call is made. There is a problem that you can not determine whether to try.

Accordingly, it is an object of the present invention to provide a method for displaying the cause of a call failure in a digital radiotelephone displaying the cause of a call not being formed in a next generation digital radiotelephone.

In order to achieve the object of the present invention, the present invention provides a first step of checking whether a link is formed when a call key is input, and a second link status message if the link is failed in the first step. A second process of displaying and setting an active mode; a third process of checking whether the active mode holding time exceeds a first predetermined time when the active mode is set; and the active mode holding time is a first predetermined time. Setting the standby mode to the standby mode, and then checking whether the active mode holding time exceeds the second schedule time, and if the active mode holding time exceeds the second schedule time, the first call failure cause message And if it is not exceeded, a fifth step of displaying the second call failure cause message.

1 is a block diagram of a next generation digital radiotelephone to which the present invention is applied.

2 is a flowchart illustrating a link state display method in a next generation digital wireless telephone according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of a next generation digital radiotelephone to which the present invention is applied.

Hereinafter, referring to FIG. 1, the controller 10 may control the overall operation and may be implemented as a one chip microprocessor. The memory 11 has a ROM for storing a predetermined program for controlling the overall operation and a RAM for temporarily storing data generated during the execution of the program. In particular, the memory 11 stores the first and second predetermined time periods and characters indicating the cause of the call failure. The key input unit 13 includes a plurality of numeric keys and function keys and generates key data for the keys. The display unit 12 displays key data input from the key input unit 13, and displays an operation state and a plurality of information by an icon. The radio frequency unit (hereinafter referred to as an "RF unit") filters and modulates a radio signal transmitted and received through the CT2 antenna. The voice processor 14 processes the voice signal input through the microphone 15 and processes the signals received from the RF unit 20 and the wireless caller 20, through the speaker 15 and the buzzer 16. Send out voice and buzzer sound.

The RF unit 20 will be described in more detail. The RF unit 20 includes a transmission / reception separator 24, a transmitter 21, a frequency synthesizer 22, and a receiver 23. The frequency combiner 22 generates a frequency for designating a transmission / reception channel of the transmitter 21 and the receiver 23 under the control of the controller 10. The transmission / reception separator 24 separates a signal to be transmitted through the CT2 antenna 25 and a signal received to the receiver 23 through the antenna 25. The receiver 23 performs a frequency conversion by filtering and low-noise amplifying the radio signal separated by the transceiver 24, and outputs the frequency signal to the signal processor 14. In particular, the receiver 23 measures a Receiver Signal Strength Indicator (RSSI) level through a window. The transmitter 21 converts the signal input from the signal processor 14 into a frequency signal and outputs the signal to the transceiver 24 in the form of a radio signal.

2 is a flowchart illustrating a method for displaying a cause of a call failure in a next generation digital wireless telephone according to an exemplary embodiment of the present invention.

As described above, in order to indicate whether the cause of the call failure is because the base station is not within the communication range (Out Of Area) or because another CT2 terminal occupies the channel (Busy or Channel Occupied), the reception of the CT2 terminal is first performed. The mode must be enabled.

In step 201 where the reception mode is enabled, the controller 10 checks whether a call key is input from the key input unit 13. At this time, when the call key is input from the key input unit 13, the control unit 10 transmits a multiplex (hereinafter referred to as "MUX") 3 signal pattern to the base station according to a known CT2 communication protocol. The MUX3 signal pattern includes a signal channel and a synchronization channel, and includes channel (link) request data. After transmitting the MUX3 signal pattern, the controller 10 proceeds to step 203 and checks whether a MUX2 signal pattern is received from a home base station or a public base station in response to the MUX3 signal pattern to determine whether a link is formed. Check it. The MUX2 signal pattern includes channel grant data with a signal channel and a synchronization channel like the MUX3 signal pattern. If the MUX2 signal pattern is received in step 203 and a call is established, the controller 10 proceeds to step 205 and displays a first link status message (eg, “SPEACH” or “call”) on the display unit 14. When the first link status message is displayed, the controller 10 sets the active mode to supply power to the RF unit 20 to initiate a call in step 207.

On the other hand, if a call is not established because the MUX2 signal pattern is not received from the base station, the controller 10 displays a second link status message (eg, “NO SERVICE”) on the display unit 14. When the second link status message is displayed, the controller 10 sets the active mode in step 211, and proceeds to step 213 to check whether the first predetermined time is exceeded. The first predetermined time is 30 sec as the time to maintain the active mode, and enables the reception mode for the first predetermined time. If the first predetermined time is exceeded in step 213, the controller 10 sets the CT2 terminal to a stand-by mode in step 215. The stand-by mode is maintained until an arbitrary key is input from the key input unit 13 and is a mode in which the sleep mode and the active mode are repeated. In the standby mode, the active mode is maintained for a second predetermined time, and the second predetermined time is typically maintained for 150 ms. The sleep mode is maintained for 1200 ms and is a mode for supplying power only to the receiver 23 for measuring the received field strength (RSSI) and disabling the transmission mode. Therefore, the standby mode is a 150ms active mode and 1200ms sleep mode is repeated. In other words, the channel strength is detected by channel scanning for 150 ms. However, if the channel requested by the controller 10 is used by another CT2 terminal, the active mode holding time exceeds 150 ms. Therefore, in order to implement the present invention, the controller 10 proceeds to step 217 and checks the channel scanning time interval to check whether the active mode holding time exceeds 150 ms. If the active mode holding time does not exceed 150 ms in step 217, the controller 10 proceeds to step 221 and displays a call second cause failure message (for example, an out of area). However, if the active mode holding time exceeds 150 ms, the controller 10 proceeds to step 219 and displays a first call failure cause message (eg, Busy or Channel Occupied).

As described above, the present invention displays the cause of the call failure on the LCD so that the user can quickly cope with the call failure.

Claims (4)

In the next generation digital cordless telephone, A first step of checking whether a link is formed when a call key is input; A second step of displaying a second link status message and setting it to an active mode if link formation fails in the first step; A third step of checking whether the active mode holding time exceeds a first predetermined time when the active mode is set; Setting a standby mode when the active mode holding time exceeds a first predetermined time, and then checking whether the active mode holding time exceeds a second predetermined time; And a fifth process of displaying a first cause of failure message when the active mode holding time exceeds a second predetermined time period, and displaying a second cause of failure message if the active mode holding time is not exceeded. The method of claim 1, And wherein the first call failure cause message indicates a busy or channel occupation failure. The method of claim 1, And indicating that the second call failure cause message is not within a call coverage range. The method of claim 1, And displaying a first link status message when the link is established in the first process, and setting the active mode to initiate a call.

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