KR20060100715A - Signal transmitter of mobile communication terminal - Google Patents

Abstract

The signal transmission apparatus of a mobile communication terminal according to an embodiment of the present invention, I / Q data generation unit for generating I (In-phase) / Q (Quadrature-phase) data to be transmitted through the terminal and the transmission timing signal Generation and control to generate the RF enable signal RF_enable (tx) that controls the I / Q data generator and controls the enable pin included in the RF chip so that the RF chip operates only for the time when the actual signal is transmitted. A digital baseband transmitter including a timing generator; A pair of digital-to-analog converters (DACs) for converting the I / Q digital data into analog signals, respectively, and I / Q modulation, and enable the operation thereof. / An analog transmitter including an RF chip having an enable pin for setting whether to disable or disable; And a digital signal processor (DSP) which performs a role of a controller for the digital baseband transmitter and the RF chip.

Description

Apparatus for signal transmitting of mobile terminal

1 is a block diagram showing a transmission apparatus of a conventional mobile communication terminal.

2 is a block diagram showing an apparatus for transmitting a mobile communication terminal according to an embodiment of the present invention.

3 is a block diagram illustrating an internal structure of a transmission timing generator of FIG. 2.

FIG. 4 is a timing diagram of signals inputted to and outputted from the transmission timing generator shown in FIG. 3.

<Explanation of symbols for the main parts of the drawings>

204: Transmission timing generator 207: RF chip

208: DSP 209: enable pin

303: Transmission timing indicator generator 307: First summer

308: second summer

The present invention relates to a mobile communication terminal, and more particularly, to a signal transmission apparatus and a transmission method of a mobile communication terminal to reduce the power consumption of the RF chip in the transmission device of the mobile communication terminal.

In a mobile communication terminal such as a mobile phone using a battery having a predetermined capacity, the time that can be used to charge the battery once is typically about tens of hours in total talk time and standby time.

However, if the terminal can be used for as long as possible with a single charge of a battery having the same capacity, even if the battery capacity is reduced, the terminal can be used for a period of time (typically 1 to 3 days) that meets the consumer's needs with a single charge have. In this case, even if a battery having a smaller capacity than that of the existing terminal is used, it is possible to secure tens of hours of use of the terminal, thereby reducing the weight and size of the terminal and reducing the thickness thereof. It will be easier for the user to carry the terminal.

However, due to the rapid development of today's technology, the power consumption of mobile terminals currently used is considerably small. As a result, there is a limit in reducing power consumption in hardware. Thus, by optimizing the information processing algorithm of the terminal, There is a way to reduce power consumption.

1 is a block diagram showing a transmission apparatus of a conventional mobile communication terminal.

Referring to FIG. 1, a conventional apparatus for transmitting a mobile communication terminal includes an I / Q data generator 101 for generating I (In-phase) / Q (Quadrature-phase) data to be transmitted through the terminal, and An I / Q data generation unit generates a transmission timing signal by the control of a pair of digital finite impulse response (FIR) filters 102 and 103 and a digital signal processor (DSP) respectively filtering the generated I / Q data. A digital baseband transmitter 100 composed of a transmission timing generator 104 for controlling 101;

A pair of digital-to-analog converters (DACs) 105 and 106 for converting the FIR-filtered I / Q digital data into analog signals, respectively, and I / Q modulation, RF frequency conversion, RF filtering, and RF amplification. An analog transmitter configured as an RF chip 107 to perform a function;

The digital baseband transmitter 100 and the digital signal processor (DSP) 108, which serves as a controller for the RF chip 107 included in the analog transmitter, are included.

Here, the I / Q data generator 101 of the digital baseband transmitter 100 performs a function of formatting data to be transmitted according to a predetermined transmission method. In general, the code division multiple access (CDMA) method spreads and scrambling user data and control data.

In the RF chip 107, I / Q signals generated by the digital baseband transmitter 100 and input through the DACs 105 and 106 are I / Q modulated, converted into RF frequencies, and filtered. And amplify it with an amplifier.

In the related art, since an enable pin is not provided separately in the RF chip 107, the RF chip 107 is always in an operating state, and thus there is a problem in that power consumption is severe.

In this regard, recently released RF chips 107 include an enable pin 109 to enable or disable the operation of the RF chip, which is an enable pin provided in the RF chip 107. Is controlled by setting enable / disable for the operation of the RF chip through the register interface in the DSP 108.

That is, in the software, the operation of the RF chip 107 is enabled before the start of signal transmission and is disabled after the transmission is completed to control the operation of the RF chip.

However, this is an approximate transmission interval such that the RF chip 107 is enabled at the DSP 108 before the start of signal transmission through the register interface and is disabled after the transmission is completed. It is merely controlling the operation of the RF chip.

That is, the RF chip cannot be operated only for a time for transmitting a predetermined signal accurately, and thus there is a limit in minimizing power consumption.

In addition, there is a transmission method in which transmission occurs in bursts only for a relatively short period such as a time division multiple access (TDMA) method, or a compressed mode transmission gap in which transmission is interrupted, such as 3GPP asynchronous method. In the case of the transmission method, if the RF chip operation is controlled in the same manner as above, it may be in an operation state even when no transmission occurs through the transmission RF chip 107, which acts as an interference to the entire communication system, It causes problems that degrade performance.

That is, it is necessary to reduce the interference to the entire communication system by disabling the operation of the transmitting RF chip 107 in the period when the terminal is not in the transmission state.

According to an aspect of the present invention, there is provided an apparatus for transmitting a mobile communication terminal including an RF chip having an enable pin, wherein the enable pin is controlled so that the RF chip operates only for a time at which an actual signal is transmitted. It is an object of the present invention to provide a signal transmission apparatus and a method of a mobile communication terminal to minimize the power consumption.

In order to achieve the above object, a signal transmission apparatus of a mobile communication terminal according to an embodiment of the present invention, an I / Q data generation unit for generating I (In-phase) / Q (Quadrature-phase) data to be transmitted through the terminal And an RF enable signal (RF_enable (tx) that controls the I / Q data generation unit by generating a transmission timing signal and controls an enable pin provided in the RF chip so that the RF chip operates only for the time when the actual signal is transmitted. A digital baseband transmitter including a transmission timing generator for generating)); A pair of digital-to-analog converters (DACs) for converting the I / Q digital data into analog signals, respectively, and I / Q modulation, and enable the operation thereof. / An analog transmitter including an RF chip having an enable pin to set whether to enable or disable; And a digital signal processor (DSP) which performs a role of a controller for the digital baseband transmitter and the RF chip.

In addition, one of the RF enable signal RF_enable (tx) generated by the transmission timing generator and the RF enable signal RF_enable (dsp) generated by the DSP is selected by a select signal controlled by the DSP through a register interface. And a multiplexer configured to be input to the enable pin.

Here, the signal input to the enable pin is a signal for controlling the enable (enable) / disable (disable) for the operation of the RF chip in order to operate the RF chip only in the period in which the actual transmission occurs. do.

In addition, the RF enable signal RF_enable (tx) has an RF chip enabled at a start point of a signal transmission by an RF On offset ahead of a reference point by a transmission timing indicator, and transmit timing at a signal transmission stop point. It is characterized in that the RF chip is disabled before or later than the reference time point by the indicator (RF On offset).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing an apparatus for transmitting a mobile communication terminal according to an embodiment of the present invention.

According to an aspect of the present invention, there is provided a transmitting apparatus of a mobile communication terminal including an RF chip having an enable pin, wherein the enable pin includes a transmit timing generator or a DSP so that the RF chip operates only for a time at which an actual signal is transmitted. The control is characterized by.

Referring to FIG. 2, an apparatus for transmitting a mobile communication terminal according to an embodiment of the present invention includes an I / Q data generation unit for generating I (In-phase) / Q (Quadrature-phase) data to be transmitted through the terminal. 201) and a transmission timing signal generated by the control of a pair of digital finite impulse response (FIR) filters 202 and 203 and a digital signal processor (DSP) for filtering the generated I / Q data, respectively. And a transmission timing generator 204 for controlling the Q data generator 201 and generating a signal for controlling the enable pin included in the RF chip so that the RF chip operates only for the time at which the actual signal transmission occurs. A digital baseband transmitter 200;

A pair of digital-to-analog converters (DACs) 205 and 206 for converting the FIR-filtered I / Q digital data into analog signals, respectively, and I / Q modulation, RF frequency conversion, RF filtering, and RF amplification. An analog transmitter configured to perform a function and include an RF chip 207 having an enable pin 209 for setting whether to enable / disable an operation;

The digital baseband transmitter 200 and the digital signal processor (DSP) 208, which serves as a controller for the RF chip 207 included in the analog transmitter, is configured to be included.

In the embodiment of the present invention, the RF enable signal (RF_enable (tx)) 210 generated by the transmission timing generator 204 and the RF generated by the DSP so that the RF chip can be operated only in a section in which the actual transmission occurs. An enable pin 209 of the enable signal (RF_enable (dsp)) 211 selected by the select signal 212 controlled by the DSP 208 through the register interface and provided in the RF chip 207. A multiplexer 213 for applying to the input signal 214 of the) is further characterized.

Here, the I / Q data generation unit 201 of the digital baseband transmitter 200 formats the data to be transmitted according to a predetermined transmission method, and in general, a user in a code division multiple access (CDMA) method. (User) Spreading and scrambling of user data and control data.

In the RF chip 207, the I / Q signal generated by the digital baseband transmitter 200 and input through the DACs 205 and 206 is subjected to I / Q modulation, converted into an RF frequency, and filtered. And amplify it with an amplifier.

As described above, in the embodiment of the present invention, the enable pin 209 is provided on the RF chip 207, and the transmission timing is generated by the enable pin 209 provided on the RF chip 207. Of the RF enable signal (RF_enable (tx)) 210 generated by the unit 204 and the RF enable signal (RF_enable (tx) 211) generated by the DSP, the select signal controlled by the DSP 208 through the register interface ( The predetermined signal selected by 212 is input.

The signal 214 input to the enable pin 209 is a signal for controlling whether to enable / disable the operation of the RF chip. In an embodiment of the present invention, an interval in which an actual transmission occurs is performed. The predetermined signal is generated and input from the transmission timing generator 204 or the DSP 208 in order to operate the RF chip only.

3 is a block diagram illustrating an internal structure of a transmission timing generator of FIG. 2.

2 and 3, the transmission timing generator 204 according to the embodiment of the present invention includes a predetermined time value 301 and a DSP 208 transmitted from a timer (not shown). The TX timing set value 302 input through the register interface is received at the same time, and the enable pin 209 of the RF chip 207 as well as the TX timing indicator 304. ) Is provided with a transmission timing indicator generation unit 303 for generating an RF enable signal (RF_enable (tx)) 309 for controlling according to the correct transmission interval.

In addition, in the transmission timing generator 204 according to the embodiment of the present invention, a first transmission timing indicator indicating a time point at which a predetermined signal starts to be transmitted by the operation of the RF chip is generated. A first RF input offset value 305 and a TX timing set value 302 indicating a time difference between a time point and a time point at which the RF chip is enabled are received and calculated. A summer 307;

RF Off Offset value 306 indicating a time difference between a time point at which a second TX timing indicator is generated and a time point at which the RF chip is disabled; And a second summer 308 that receives the TX timing set value 302 and calculates the TX timing set value 302.

The RF chip enable time point and the disable time point value are calculated through operations in the first and second summers 307 and 308.

Accordingly, the timing indicator generator 303 compares the RF chip enable time and disable time values calculated by the first and second summers with the timer value 301 received from the transmission timer. An RF enable signal (RF_enable (tx)) 309 is generated.

4 is a timing diagram of signals inputted to and outputted from the transmission timing generator shown in FIG. 3.

FIG. 4 illustrates a form in which a transmission signal that has started transmission is applied as an input of the FIR filter by the TX timing indicator generated by the transmission timing indicator generation unit 303 and appears as an output of the FIR filter.

Referring to FIG. 4, when a predetermined signal transmission through the RF chip is stopped when the FIR output is generated by the FIR input, the output signal is transmitted by the influence of the FIR filter. It can be seen that it stretches more than the reference time point defined by.

In addition, it is necessary to enable the RF chip earlier than the reference time by the transmission timing indicator in consideration of the delay time of the RF chip at the start of transmission.

Accordingly, the time difference between the transmission start time and the RF chip enable time by the TX timing indicator is an RF On offset 401, and the transmission stop time and the RF chip disable by the transmission timing indicator. The time difference from the viewpoint is represented by an RF Off offset 402,

In addition, FIG. 4 illustrates an example in which transmission is interrupted due to a compressed mode transmission gap of 3GPP asynchronous scheme. In this case, RF off offset 402 and RF on are also described. It can be seen that an offset (RF On offset) value 401 is applied.

Referring to FIG. 3, the RF On Offset value 305 and the RF Off Offset value 306 set through the register interface in the DSP are transmitted at the transmission start time and the transmission stop time, respectively. The TX timing set value 302 and the first and second summers 307 and 308 calculate the RF chip enable time and the disable time value.

Accordingly, the timing indicator generator 303 generates an RF enable signal (RF_enable (tx)) 309 at the corresponding time point by comparing the calculated RF chip enable time and disable time value with the value 301 from the transmission timer. Let's go.

The RF enable signal RF_enable (tx) generated as described above is enabled before the reference time by the transmission timing indicator at the start of transmission as shown in FIG. 4, and is enabled by the RF on offset value. The signal becomes disabled before or after the RF off offset value.

That is, the RF On Offset value has a negative value to enable the RF chip before the reference time point, and the RF Off Offset value generally disables the RF chip enable signal after the reference time point. It should be as positive as possible.

However, the case where the delay time of the RF chip is considerably long may have a negative value.

Referring back to FIG. 2, the RF enable signal (RF_enable (tx)) 210 generated by the transmission timing generator 204 is an RF enable signal RF_enable (dsp) generated through the register interface of the DSP 208. 211 and a multiplexer 213 are selected and applied to the input of the enable pin 209.

That is, the RF enable signal for controlling the enable pin 209 is generated through the RF enable signal (RF_enable (tx)) 210 generated by the transmission timing generator 204 and the register interface of the DSP 208. There is an RF enable signal (RF_enable (dsp)) 211, which is selected through the select signal 212 applied through the register interface of the DSP 208 is input to the enable pin 209.

In other words, an embodiment of the present invention provides an RF enable signal (RF_enable (tx)) 210 generated by the transmission timing generator 204 or a RF enable signal generated through a register interface of a DSP according to a user's selection. The operation of the RF chip can be controlled using the RF_enable (dsp)) 211.

However, this is only one embodiment, and as described above, the RF enable signal RF_enable (tx) generated by the transmission timing generator 204 in order to operate the RF chip only for the time at which the actual signal transmission occurs. Only)) 209 may be configured to be input to the enable pin.

According to the present invention, the power consumption can be greatly reduced by leaving the transmitting RF chip in an operating state only in a section in which the actual transmission occurs and leaving the transmitting RF chip in an inoperative state in a section in which the actual transmission does not occur.

In particular, there is a transmission mode in which transmission occurs in a burst only during a relatively short period such as a time division multiple access (TDMA) method, or a compressed mode transmission gap in which transmission is temporarily stopped, such as a 3GPP asynchronous method. In the existing transmission scheme, a greater effect can be expected.

In addition, by leaving the transmitting RF chip in an inoperative state in a period where no actual transmission occurs, the system efficiency can be improved by reducing interference of the entire communication system.

Claims (9)

An I / Q data generator for generating in-phase (Quadrature-phase) data to be transmitted through a terminal, and generating a transmission timing signal to control the I / Q data generator, and the RF chip actually A digital baseband transmitter including a transmission timing generator for generating an RF enable signal (RF_enable (tx)) for controlling an enable pin included in the RF chip so as to operate only for a time at which signal transmission occurs; A pair of digital-to-analog converters (DACs) for converting the I / Q digital data into analog signals, respectively, and I / Q modulation, and enable the operation thereof. / An analog transmitter including an RF chip having an enable pin for setting whether to disable or disable; And a digital signal processor (DSP) serving as a controller for the digital baseband transmitter and the RF chip. The method of claim 1, One of the RF enable signal RF_enable (tx) generated by the transmission timing generator and the RF enable signal RF_enable (dsp) generated by the DSP is selected by a select signal controlled by the DSP through a register interface. And a multiplexer configured to be input to the enable pin. The method of claim 1, The RF chip performs I / Q modulation on the I / Q signal generated by the digital baseband transmitter, the RF signal is converted to an RF frequency, filtered, and amplified by an amplifier. Signal transmitting device of the terminal. The method of claim 1, The signal input to the enable pin is a signal for controlling whether to enable / disable the operation of the RF chip in order to operate the RF chip only in a section in which actual transmission occurs. Signal transmitter of a communication terminal. The method of claim 1, In the transmission timing generator, A TX timing indicator is generated by receiving a timer value transmitted from a timer and a TX timing set value input through a register interface of the DSP at the same time, And a transmission timing indicator generator configured to generate an RF enable signal (RF_enable (tx)) for controlling the enable pin of the RF chip according to an accurate transmission interval. The method of claim 5, In the transmission timing generator, An RF on offset indicating a time difference between a time point at which a first TX timing indicator is generated and a time point at which the RF chip is enabled by the operation of the RF chip. A first adder configured to receive an RF On offset value and the TX timing set value, and calculate the RF On offset value; An RF off offset value indicating a time difference between a second TX timing indicator generation time indicating when the predetermined signal transmission is stopped and a time when the RF chip is disabled and the transmission And a second adder configured to receive a timing set value and calculate the same. The method of claim 6,  The signal transmission device of the mobile communication terminal, characterized in that the enable time and the disable time value of the RF chip is calculated through the calculation in the first and second summers. The method of claim 7, wherein RF enable signal RF_enable (tx) in the timing indicator generator by comparing the RF chip enable time and disable time values calculated by the first and second summers with a timer value received from a transmission timer. Signal transmission apparatus of the mobile communication terminal, characterized in that the generated. The method of claim 8, The RF enable signal (RF_enable (tx)) is, At the start of signal transmission, the RF chip is enabled by an RF On offset ahead of the reference point by the transmission timing indicator, and at the point of interruption of signal transmission, the RF On offset is earlier than the reference point by the transmission timing indicator. Signal transmitting device of a mobile communication terminal characterized in that the RF chip is disabled as early or late.

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