KR100765544B1 - Mobile communication termial haveing more than one system and controlling method thereof - Google Patents

Abstract

The present invention relates to a mobile communication terminal having a plurality of systems and a control method thereof, comprising: a first system unit performing a first system function and outputting a first mode switching signal for switching a system mode of the first system; A second system unit performing a second system function and outputting a second mode switch signal for switching the system mode of the second system; A main clock for outputting a main clock signal; Converts the main clock signal generated in the main clock according to the first mode switching signal and supplies it to the system clock of the first system unit, and converts the main clock signal generated in the main clock according to the second mode switching signal. It characterized in that it comprises a clock distribution device for supplying to the system clock of the second system unit. Accordingly, in the mobile communication terminal having a plurality of systems operating in different system clocks, the main clock can be shared among the systems, thereby enabling a miniaturized design of the mobile communication terminal and reducing the production cost.

Description

Mobile communication terminal with multiple systems and control method thereof {MOBILE COMMUNICATION TERMIAL HAVEING MORE THAN ONE SYSTEM AND CONTROLLING METHOD THEREOF}

1 is a control block diagram of a mobile communication terminal having a plurality of conventional systems;

2 is a control block diagram of a mobile communication terminal having a plurality of systems according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: mobile communication terminal 13: GSM system

15: VoIP system 17; Main clock

20: clock distribution device 22, 24: NAND gate

The present invention relates to a mobile communication terminal having a plurality of systems and a control method thereof.

Voice over Internet Protocol (VoIP) is a technology that converts voice signals into compressed data packets and transmits them over the Internet based on IP networks. Since VoIP service is performed by integrating voice signal with data of packet network, VoIP can provide various multimedia services together with voice phone service and can reduce communication cost. Accordingly, a technique for adding a VoIP function to a mobile communication terminal has been studied.

1 is a control block diagram of a mobile communication terminal supporting a conventional VoIP function. As shown in FIG. 1, the conventional VoIP mobile communication terminal 1 is equipped with a GSM system 3 for mobile communication network connection and a VoIP system 5 for VoIP.

The GSM system 3 is for wirelessly transmitting / receiving a user's voice or data according to a mobile communication standard, and can also apply a CDMA system or the like according to a mobile communication service environment.

The VoIP system 5 converts a voice signal into a compressed data packet for wireless transmission and reception through the Internet based on an IP network. The VoIP system 5 compresses and decompresses transmitted and received packet data and controls access to the IP network. Has

In order to mount the GSM system 3 and the VoIP system 5 together in the mobile communication terminal 1, the first main clock 7 and the VoIP system 5 for providing a system clock of the GSM system 3 are provided. Each of the second main clocks 9 for providing the system clocks should be provided. This is because the system clocks for the operation of the two systems are different, and in particular, in the case of the mobile communication terminal 1, it is often necessary to control the system clock to put the system into a power saving mode to save battery power. It is difficult for the two systems to share a single main clock because the timing at which the system 3 and the VoIP system 5 enter the power saving mode is independent.

Therefore, when the VoIP system is added to the mobile communication terminal, two main clocks must be provided in the mobile communication terminal, which causes difficulty in securing a design space within a limited space and increases production costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In the mobile communication terminal having a plurality of systems operating with different system clocks, the main clock can be shared among the systems, thereby enabling a miniaturized design of the mobile communication terminal. And to provide a mobile communication terminal having a plurality of systems that can reduce the production cost and its control method.

A mobile communication terminal having a plurality of systems according to the present invention for achieving the above object, the first system unit performing a first system function and outputs a first mode switch signal for switching the system mode of the first system Wow; A second system unit performing a second system function and outputting a second mode switch signal for switching the system mode of the second system; A main clock for outputting a main clock signal; Converts the main clock signal generated in the main clock according to the first mode switching signal and supplies it to the system clock of the first system unit, and converts the main clock signal generated in the main clock according to the second mode switching signal. It characterized in that it comprises a clock distribution device for supplying to the system clock of the second system unit.

The first system unit may perform a communication function through a mobile communication network according to a mobile communication standard.

The first mode switching signal may be a signal for switching the system mode of the first system unit to a power saving mode.

In addition, the first system unit may have a GPIO pin for outputting the first mode switch signal to the clock distribution apparatus under a predetermined power saving mode condition.

On the other hand, the second system unit, it is possible to perform a communication function over the IP network in accordance with Voice over Internet Protocol (VoIP).

The second mode switching signal may be a signal for switching the system mode of the second system unit to a power saving mode.

In addition, the second system unit may have a GPIO pin for outputting the second mode switch signal to the clock distribution apparatus under a predetermined power saving mode condition.

The clock distribution device may include a first NAND gate configured to receive a main clock signal output from the main clock and the first mode switching signal output from the first system unit and output a system clock to the first system unit. Wow; It is possible to include a second NAND gate that receives a main clock signal output from the main clock and the second mode switching signal output from the second system unit and outputs a system clock to the second system unit.

According to another aspect of the present invention, there is provided a control method of a mobile communication terminal having a first system and a second system, the method comprising: receiving a main clock signal generated in a main clock; Receiving a first mode switch signal for switching the system mode of the first system and a second mode switch signal for switching the system mode of the second system; Converting the main clock signal to the first system according to the first mode switching signal and converting the main clock signal to the second system according to the second mode switching signal. It can also be achieved by a method of controlling a mobile communication terminal characterized by.

Here, the first system can perform a communication function through a mobile communication network according to a mobile communication standard.

The first mode switching signal may be a signal for switching the system mode of the first system to a power saving mode.

The method may further include outputting the first mode switching signal through the GPIO pin in the first system under a predetermined power saving mode condition.

On the other hand, the second system, it is possible to perform a communication function over the IP network in accordance with Voice over Internet Protocol (VoIP).

The second mode switching signal may be a signal for switching the system mode of the second system to a power saving mode.

The method may further include outputting the second mode switch signal through the GPIO pin in the second system under a predetermined power saving mode condition.

The method may further include converting the main clock signal to the first system according to the first mode switching signal and converting the main clock signal to the second system according to the second mode switching signal. Logically operation the main clock signal and the first mode switching signal through a first NAND gate to supply the system clock to the first system, and supply the main clock signal and the second mode switching signal through a second NAND gate. And logically computing and supplying to the second system a system clock.

Hereinafter, a mobile communication terminal having a plurality of systems and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a control block diagram of a mobile communication terminal having a plurality of systems according to the present invention. The mobile communication terminal 10 includes a first system unit and a second system unit that each perform independent functions. In FIG. 2, the GSM system 13 is applied as the first system unit and the VoIP system as the second system unit. The case where (15) is applied is illustrated. Accordingly, the mobile communication terminal according to an embodiment of the present invention has a configuration for GSM service, a GSM system 13 for outputting a mode control signal GPIO_A for switching to a power saving mode, and a configuration for VoIP service. VoIP system 15 for outputting mode control signal GPIO_B for switching to power saving mode, main clock 17 for providing system clocks to both systems 13 and 15, and output from main clock 17 And a clock distribution value 20 for converting the main clock signal and providing the system clock to the systems 13 and 15 as a system clock.

The GSM system 13 may be applied to the CDMA system, GSM system 13, etc. according to the standard of the mobile communication service, the GSM system 13 illustrated in the present description is wireless transmission and reception of data such as voice according to the GSM standard . In addition, the GSM system 13 has a GPIO_A output pin for outputting a power saving mode control signal GPIO_A when it is necessary to switch to the power saving mode. GPIO (General Purpose Input / Output) is an input / output pin used for general purposes, and can be programmed to output a predetermined signal under a predetermined condition. Accordingly, in the power saving mode condition, the power saving mode control signal GPIO_A can be programmed to be output from the GPIO_A output pin provided in the GSM system 13, where a call or a user input exists as the power saving mode condition. If not, the idle time of a process such as searching a network or scanning a channel may be set.

The VoIP system 15 converts a voice signal into a compressed data packet, wirelessly transmits and receives through the Internet based on an IP network, and has a GPIO_B output pin for outputting a VoIP power saving mode control signal GPIO_B. The GPIO_B output pin outputs the VoIP power saving mode control signal GPIO_B when the VoIP system 15 needs to enter the power saving mode.

The clock divider inputs the system clock output from the main clock 17 to the GSM system 13 and the VoIP system 15. The power saving mode control signal GPIO_A is output from the GPIO_A output pin provided in the GSM system 13. If the system clock input to the GSM system 13 in the form of a system clock for entering the power saving mode, and the VoIP power saving mode control signal (GPIO_B) is output from the GPIO_B output pin provided in the VoIP system 15 VoIP The system clock input to the system 15 is input in the form of a system clock for entering the power saving mode. The system clocks respectively inputted from the clock distribution device 20 to the GSM system 13 and the VoIP system 15 do not affect each other, and according to the power saving mode control signals output from the systems 13 and 15, respectively, the corresponding system clocks. Enter the clock into the system.

As a configuration of the clock distribution device 20 which performs this function, in FIG. 2, the system clock is supplied to both systems 13 and 15 through a simple logic circuit composed of two NANDs (A, B). The case is illustrated. Here, the logical formulas of the NAND gate A 22 and the NAND gate B 24 used are shown in Table 1 below.

<Table 1>

In Table 1, A and B represent two inputs of the NAND gates 22 and 24, and Y represents an output of the NAND gate. As shown in Table 1, in the case of NAND gates (A, B) 22 and 24, a high signal is generated only when both input values are logical "1", that is, both input values are high. Is output. Accordingly, the first inputs of the two NAND gates A and B 22 and 24 are connected to the main clock 17 which is changed to low / high at regular intervals, and the second inputs respectively save power of the corresponding systems 13 and 15. Connect to GPIO A and GPIO B where the mode control signal is output. Therefore, when the signals output from GPIO A and GPIO B are combined with the main clock signals at the NAND gates (A, B) 22, 24, GPIO A and GPIO are output as desired signals from the corresponding systems 13 and 15. The signal output on the B pin must be programmed.

For example, if the system clock of the main clock 17 has the same period but the low / high magnitude is supplied with the inverted signal, the inverted signal having the same period as the signal generated by the main clock 17 has the same period. It will be supplied to the system clocks Clock_A and Clock_B of the systems 13 and 15. In addition, when a system clock in a power saving mode having a lower frequency than the system clocks Clock_A and Clock_B is desired, a signal output from the NAND gates A and B may be adjusted by controlling a signal output from the GPIO pin.

<Table 2> is an example of each system status according to signal output from GPIO pin.

<Table 2>

In Table 2, when both the GSM system 13 and the VoIP system 15 are in a normal state, a low signal is output from each GPIO. When the high and low main clock signal and low signal are inputted to the NAND gates A and B, the input states are (0, 0) and (0, 1) are repeated. 0) the same high / low signal as the period of the main clock signal is output. Thus, the GSM system 13 and the VoIP system 15 perform call processing or scan channels in the high (logical "1") period of the system clock.

On the other hand, the power saving state signal output from the GPIO is a signal in which the high / low repeats according to the system clock cycle for performing the power saving mode, and the output of the NAND gates A and B is higher than the system clock supplied in the normal state. The period of is set long.

Here, the GPIO pins GPIO_A and GPIO_B of the GPIO pins are output independently of each other according to the state of the corresponding system 13 and 15, so that the main clock 17 can be shared and the system control can be independent of each other.

The clock distribution device 20 may be implemented in various forms through a control circuit, a logic circuit, a microcomputer, or the like. In this case, the main clock signal 17 is configured to be output in the form of a system clock in the power saving mode according to the output values of the GPIO pins output from the respective systems 13 and 15. You can get the effect of sharing.

Therefore, the clock distribution device 20 drives not only the GSM system 13 and the VoIP system 15 in the above-described example but also a plurality of systems controlled by different system clocks using a single main clock. Applicable

As described above, the present invention is controlled by different system clocks, and in a plurality of systems capable of outputting a control signal through a GPIO pin or the like according to a system state, a single main clock is converted by using the corresponding control signal. To share. As a result, the system can be miniaturized and the production cost can be reduced.

As described above, the embodiment according to the present invention is not limited to the above, and various modifications can be made within the scope apparent to those skilled in the art in connection with the present invention.

As described above, the mobile communication terminal having a plurality of systems of the present invention and a method of controlling the same may be controlled through a GPIO pin or the like when each system unit operating with a different system clock is to switch the system mode of the corresponding system unit. The switching signal is outputted, and the main clock is converted and supplied to the corresponding system unit according to each mode switching signal outputted from the system unit so that the plurality of system units share a single main clock.

As a result, a miniaturized design of a mobile communication terminal having a plurality of systems is possible and the production cost can be reduced.

Claims (16)

A first system unit performing a first system function and outputting a first mode switch signal for switching the system mode of the first system to a power saving mode; A second system unit performing a second system function and outputting a second mode switch signal for switching the system mode of the second system to a power saving mode; A main clock for outputting a main clock signal; Converts the main clock signal generated in the main clock according to the first mode switching signal and supplies it to the system clock of the first system unit, and converts the main clock signal generated in the main clock according to the second mode switching signal. And a clock distribution device for supplying the system clock to the second system unit. The method of claim 1, The first system unit, A mobile communication terminal having a plurality of systems, characterized in that for performing a communication function through a mobile communication network according to the mobile communication standard. delete The method according to claim 1 or 2, And the first system unit has a GPIO pin for outputting the first mode switch signal to the clock distribution device under a predetermined power saving mode condition. The method of claim 1, The second system unit, A mobile communication terminal having a plurality of systems, characterized in that to perform a communication function over the IP network in accordance with Voice over Internet Protocol (VoIP). delete The method according to claim 1 or 5, And the second system unit has a GPIO pin for outputting the second mode switch signal to the clock distribution device under a predetermined power saving mode condition. The method of claim 1, The clock distribution device, A first NAND gate receiving a main clock signal output from the main clock and the first mode switching signal output from the first system unit and outputting a system clock to the first system unit; And a second NAND gate configured to receive a main clock signal output from the main clock and the second mode switching signal output from the second system unit and output a system clock to the second system unit. Mobile communication terminal with two systems. Claim 9 was abandoned upon payment of a set-up fee. In the control method of a mobile communication terminal having a first system and a second system, Receiving a main clock signal; Receiving a first mode switch signal for switching the system mode of the first system to the power saving mode and a second mode switch signal for switching the system mode of the second system to the power saving mode; The main clock signal is converted to the system clock of the first system according to the first mode switching signal, and the main clock signal is converted to the system clock of the second system according to the second mode switching signal. Control method of a mobile communication terminal having a plurality of systems, characterized in that it comprises a step of. Claim 10 was abandoned upon payment of a setup registration fee. The method of claim 9, The first system, A control method of a mobile communication terminal having a plurality of systems, characterized in that for performing a communication function through a mobile communication network according to the mobile communication standard. delete Claim 12 was abandoned upon payment of a registration fee. The method according to claim 9 or 10, And outputting the first mode switch signal through the GPIO pin in the first system under a predetermined power saving mode condition. Claim 13 was abandoned upon payment of a registration fee. The method of claim 9, The second system, A control method of a mobile communication terminal having a plurality of systems, characterized in that to perform a communication function via the IP network in accordance with Voice over Internet Protocol (VoIP). delete Claim 15 was abandoned upon payment of a registration fee. The method according to claim 9 or 13, And outputting the second mode switch signal through the GPIO pin in the second system under a predetermined power saving mode condition. Claim 16 was abandoned upon payment of a setup registration fee. The method of claim 9, Converting the main clock signal according to the first mode switching signal and supplying it to the first system, and converting the main clock signal according to the second mode switching signal and supplying the main clock signal to the second system; The main clock signal and the first mode switching signal are logically operated through a first NAND gate to be supplied to a system clock of the first system, and the main clock signal and the second mode switching signal are supplied through a second NAND gate. And performing a logical operation to supply to the system clock of the second system.

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