KR100237443B1 - Complex digital cellular mobile terminal equipment and local time display method therefor - Google Patents

Abstract

In this digital cellular wireless composite terminal, the mobile station part has the local time offset value of each country and major city in advance, and when the user selects a specific area that he / she wants to know the current time, The local time offset value is discarded, and the local time offset value of the currently selected user is calculated from the previously obtained local time offset value together with the system time received from the sync channel message to calculate the current time of the specific area desired by the user. The personal data assistant module transmits via a general-purpose asynchronous transceiver to the personal data assistant module, which is displayed on a world map or otherwise graphically.

Description

Digital cellular wireless composite terminal and local time display method in the terminal {COMPLEX DIGITAL CELLULAR MOBILE TERMINAL EQUIPMENT AND LOCAL TIME DISPLAY METHOD THEREFOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cellular wireless composite terminal and a method for displaying the current time of a specific region in a digital cellular system employing a code division multiple access (CDMA) scheme.

In general, a digital cellular wireless terminal adopting the CDMA method calculates the time of the current location using a system time and a local time offset included in a synchronization channel message received from a base station. To be displayed. The system time is based on 0: 0 on January 6, 1980 (starting point). In other words, starting at this time, one frame is generated every 20ms, and it is a count value indicating how many frames have occurred. In addition, the local time offset is a time offset of a region to which the current base station belongs, and indicates how far the time frame of the current region is from the reference system time.

1 is a block diagram of a code division multiple access digital cellular system. Home Location Register (HLR) 110 is a register that stores information about a base station. The Mobile Switching Center (hereinafter referred to as MSC) is connected to a Public Switching Telephone Network (PSTN), and reads location information from the location register 110 to switch its base stations. The base station 200 includes a base station controller 230 (hereinafter referred to as a BSC) 230 and a base transceiver station (hereinafter referred to as a BTS) 235. The base station controller 230 receives visual data and latitude and longitude data from a global positioning system (GPS). The system time is calculated using the time data. The GPS is a method of finding the current three-dimensional position and time by the principle of triangulation by receiving information about time and location from 24 satellites floating in the air. The base station transmitter 235 transmits the system time to the mobile station 300 in a synchronization channel message along with the local time offset corresponding to the area where the base station is currently located.

2 is a block diagram of the MS, that is, a general digital cellular terminal. The receiving unit 22 is connected to the antenna to transmit and receive the RF signal. The frequency converter 23 is a baseband analog component, which downconverts and digitizes an analog intermediate frequency signal of a received RF signal into a baseband frequency domain or converts digital data into an analog baseband signal. After converting to, up-converting to the middle frequency region again to generate the transmit RF signal. The modulator / demodulator 35 modulates or demodulates the CDMA signal. The central processing unit (hereinafter referred to as CPU1) 28 collectively controls the overall operation of the terminal. The flash memory 24 stores programs and data for controlling the overall operation of the terminal. RAM 25 stores various variables and other data according to the execution of the program. EEPROM 26 stores phone numbers, Electronic Serial Numbers (ESNs) and system variables. The display unit 29 is a liquid crystal display (LCD) to display various states of the terminal. The keypad 21 is used as a user interface means such as inputting a command or data required for a terminal-specific operation. The PCM codec 21 performs various processes in accordance with digital transmission of a voice signal, such as digitization of a voice signal to be transmitted and restoration of the voice signal through analogization of a received signal.

Referring to FIG. 1 again, as described above, the format of a synchronization channel message carrying a local time offset together with a system time is shown in the following table.

Field Bits MSG_TYPE 8 P_REV 8 MIN_P_REV 8 SID 15 NID 16 PILOT_PN 9 LC_STATE 42 SYS_TIME 36 LP_SEC 8 LTM_OFF 6 DAYLT One PRAT 2 Spare 3

In the table, MSG_TYPE represents a message format for communication between the CDMA terminal 300 and the base station 200, P_REV represents a protocol revision level, and MIN_P_REV represents a minimum protocol revision level. If the protocol revision level that only the handset has is less than the MIN_P_REV, the synchronization channel will not be found and the handset will look for another base station. SID stands for System Identification, NID stands for Network Identification, PILOT_PN stands for Pilot Pseudo Noise Offset Index, LC_STATE stands for Long Code Status, SYS_TIME represents system time and LTM_OFF represents local time offset. DAYLT represents the daylight savings time indicator and PRAT represents the paging channel data rate.

When receiving the system time, the mobile station, that is, the CDMA terminal 300 calculates and displays the time of the area corresponding to the local time offset. Specifically, when power is supplied to the CDMA terminal 300, the CDMA terminal 300 first searches for a pilot channel having the strongest received signal strength indicator (RSSI). If the CDMA terminal 300 succeeds in finding the strongest pilot channel, it receives a sync channel message. The system time of the base station 200 included in the synchronization channel message may be detected and the timing temporarily synchronized with the pilot channel may be adjusted according to the system time. In other words, if the mobile station knows only the local time offset values of major cities or regions around the world, it discards the local time offsets detected from the sync channel message and uses the local time offset value of the area to which the user wants to know the time. You can find out by calculating. Processing of the paging channel and the access channel takes place after the above operation.

However, if the system time and the local time offset of the sync channel message are simply displayed with the number of the current location in which the user is currently located, the user cannot visually distinguish which time zone the current user is in. In other words, it is not possible to display a graphical time zone with the current CDMA terminal itself display device. Also, it is not easy for users to access the world's time, such as the cumbersome keystrokes to check the time in other regions.

It is therefore an object of the present invention to provide a digital cellular wireless composite terminal having a PDA module.

Another object of the present invention is to provide a method for mathematically or graphically displaying a current time of a specific area in a digital cellular wireless hybrid terminal.

1 is a block diagram of a code division multiple access digital cellular system

2 is a block diagram of a general digital cellular terminal

3 is a block diagram of a general personal data assistant

4 is a diagram illustrating a configuration of a digital cellular wireless hybrid terminal according to an embodiment of the present invention.

5 is a diagram showing a state in which a time zone is displayed on the personal data assistant screen;

6 is a flowchart illustrating a process of displaying a specific local time of a digital cellular wireless hybrid terminal 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 of all, 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 addition, in the following description, specific matters such as specific types of memories are shown, which are provided to help a more general understanding of the present invention, and the present invention may be practiced without these specific matters. It is self-evident to those who have knowledge of the world. 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.

3 is a configuration diagram of a general personal data assistant (hereinafter referred to as PDA module). Flash memory 36 stores programs and data for controlling the overall operation of the PDA module. RAM 37 stores various variables and other data according to the execution of the program. EEPROM 38 stores local time offsets from around the world. The local time offset may be stored in the flash memory, but the contents may be easily modified by storing it in this pyrom. The display unit 33 is a liquid crystal display (LCD) and displays various states of the PDA module. The keypad 32 is used as a user interface means for entering commands or data necessary for the operation of the PDA module. The central processing unit (hereinafter referred to as CPU2) 35 collectively controls the overall operation of the terminal.

4 illustrates a configuration of a digital cellular wireless hybrid terminal according to an embodiment of the present invention, in which the PDA module 200 combines the remaining portion of the CDMA terminal of FIG. 2 except for the display unit 29 and the keypad 30. At this time, the CPU2 35 of the PDA module 200 and the CPU1 28 of the CDMA terminal communicate with each other through RS-232C through a port of a universal asynchronous receiver transmitter (hereinafter referred to as a UART). At this time, the message format is high level data link control (HDLC), and the transmission rate is 57.6 Kbps. The UART 400 is an asynchronous transmission and reception apparatus capable of serial to parallel conversion and parallel to serial conversion used for data transmission. This combination allows the user interface data corresponding to the CDMA terminal to be processed graphically in the PDA module 200. The world map information according to the present embodiment and the time difference timetables of the major cities of the countries of the world may be stored in the flash memory 36 or Epyrom 38. The local time offset of the region where the terminal is used may be received in the sync channel message but may be stored in the flash memory 36 or EPI rom 38.

5 is a diagram illustrating a state in which a time zone is displayed on a personal data assistant screen, and FIG. 6 is a flowchart illustrating a process of displaying a specific local time of a digital cellular wireless hybrid terminal according to an embodiment of the present invention.

With the world map displayed, points representing major countries or cities in the world are displayed, and in particular, the area (country, city) where you (base station) is located is flashing or lit to distinguish it from other points. In the position spaced apart from the predetermined distance is displayed the time corresponding to the area. In this state, when the user clicks on any one of the multiple points, the current time of the country or city corresponding to the point is displayed at a position spaced a certain distance from the point. It is calculated based on the time difference table based on the local time.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention combines the CDMA terminal and the PDA module to allow the PDA module to process the user interface of the CDMA terminal so that a certain type of information that cannot be displayed by the CDMA terminal alone is displayed on the screen of the PDA module. have. In addition, even if the same information has a specific different form, it is possible to increase the convenience of reading by the user. In addition, it is possible to improve the readability of the user by transmitting the local time display of the CDMA terminal to the PDA module and displaying it on the world map displayed on the screen of the PDA module. In addition, the area can be identified at a time using the touch screen panel of the PDA module, which is easy to use. For users who have a lot of international calls in business, it is convenient to check the time of the area where they want to make a call directly from the terminal without having to calculate or know the local time of the area.

Claims (4)

Personal data assistant module, General purpose asynchronous transceiver, When the predetermined data is exchanged with the personal data assistant module through the general-purpose asynchronous transceiver, the user interface means of the personal data assistant module are shared, and the visual display function for a specific area is detected through the user interface means. Receives a synchronization channel message from a base station to which it belongs, detects only the system time, finds a local time offset value corresponding to the specific area in a time difference table composed of local time offset information, and calculates a current time for the specific area. And a code division multiple access wireless telephone unit for transmitting to the personal data assistant module via a transceiver. The personal data assistant module of claim 1, wherein Further comprising a memory for storing the world map information, in response to receiving the predetermined control data from the code division multiple access wireless telephone unit through the general-purpose asynchronous transceiver, and displays the world map in response to the predetermined form, on the world map To display a plurality of regions, the currently located region or a specific region to be distinguished from the rest of the region, and the time corresponding to the currently located region or a specific region is displayed at a position close to the region display form. Digital cellular wireless composite terminal. According to claim 2, The user interface means of the personal data assistant module, A digital cellular wireless composite terminal having a personal data assistant and a state of a wireless terminal, and a touch screen panel. A digital cellular wireless composite terminal having a code division multiple access wireless telephone unit that exchanges data with a personal data assistant module through a general-purpose asynchronous transceiver and shares user interface means of the personal data assistant module having world map information and time difference timetable. In the method for the personal data assistant module to display the time of a specific area, When a specific local time display function is selected by the user interface means, the world map is displayed and the major countries or cities of the world are displayed in a predetermined form, and the currently located area is displayed in a different form from the rest of the area, A first step of displaying the corresponding time in letters; A second step of checking whether a specific area is selected by the user interface means while the current time is displayed; When a specific region is selected by the user interface means, the form representing the specific region is displayed in a different form from the rest of the region, and the current time information of the selected specific region is transmitted to the code division multiple access wireless telephone unit through the universal asynchronous transceiver. The third process requiring And receiving a current time information on the specific region from the code division multiple access wireless telephone unit through the general purpose asynchronous transceiver, displaying a text in a position close to the form representing the specific region. .

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