KR100567917B1 - Device and method for improving switching spectrum characteristics of mobile communication terminal - Google Patents

Abstract

The present invention obtains and records a pedestal scaling factor during mass production of a mobile communication terminal using an integrated power amplifier (iPAC) module to maintain a pedestal level for a certain period to improve switching spectrum characteristics. The present invention relates to an apparatus and a method for improving switching spectrum characteristics of a mobile communication terminal.

According to the present invention, a pedestal scaling factor is obtained and recorded in a terminal during mass production of a mobile communication terminal, thereby maintaining ramping while maintaining a pedestal level for a certain period of time when the mobile terminal transmits transmission power. In this way, the pedestal level can be maintained for a certain period of time, thereby improving switching characteristics and further improving call quality.

Mobile terminal, iPAC module, power amplification module, pedestal scaling factor, pedestal level, switching spectrum, transmit power, rising ramp

Description

Apparatus And Method For Switching Spectrum Specification Tuning In The Mobile Communication Terminal}

1 is a graph illustrating a transmission standard burst (rising / falling ramp mask) of a typical mobile communication terminal.

2 is a diagram schematically illustrating a rising / falling lamp mask of a conventional mobile communication terminal.

3 illustrates an elevated ramp mask maintaining a pedestal level.

4 is a diagram illustrating a pedestal correction configuration for obtaining a pedestal scaling factor according to the present invention.

5 is a diagram illustrating a state in which a pedestal level is maintained for a predetermined time in a rising section in a mobile communication terminal according to the present invention.

6 is a flowchart illustrating an operation of obtaining a pedestal scaling factor for improving switching spectrum characteristics in a mobile communication terminal according to an embodiment of the present invention.

7 is a flowchart illustrating an operation of applying a lamp DAC using a pedestal scaling factor in a mobile communication terminal according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

41: mobile communication terminal 42: terminal interface equipment

43: computer 44: network equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching spectrum of a mobile communication terminal. In particular, a pedestal scaling factor is obtained and recorded during a mass production process of a mobile communication terminal using a current amplification power amplification module. The present invention relates to an apparatus and method for improving switching characteristics of a mobile communication terminal capable of maintaining a level to improve switching characteristics.

In general, an Output Radio Frequency Spectrum (ORFS) of a mobile communication terminal is related to the lamp shape of a tx normal burst, as shown in FIG. 1. .05.05).

The mobile terminal has a process of calibrating the midamble power (3) for each power level at the time of mass production, which is called power DAC calibration, and the regulation follows the aforementioned standard.

In Fig. 1, the sections ① and ② are elements of a lamp that determines the switching spectrum. Due to this characteristic, the transmission burst of the mobile communication terminal may act as an interference wave to other users, and thus correction of the lamp element is important. Have

The sections ① and ② which become such lamp elements can be corrected depending on the characteristics of the power amplifier module (PAM) in the wireless module. In this case, the section ① is a ramp rising section and the section ② is ramped. It is called a ramp falling section, and each duration has a length of 32 qbits (29.5 ms).

In the case of the conventional power amplification module, the mask curve may vary depending on the manufacturer, but typically increases while drawing a sign curve, and the locus is a switching spectrum value based on a standard for each frequency offset. You must take a value of a size that satisfies.

Accordingly, products designed with the same model have the rising ramp and falling ramp trajectories with the same characteristics, which is an important factor during a call using a mobile communication terminal. If this value is wrong, it may act as an interference to other users. have.

Therefore, in the mobile communication terminal aspect process, if the power DAC correction is performed based on the standard of only the size of the mid-ample power (③) without changing the predetermined rising ramp and falling ramp values, the elements related to the radio characteristics are completed.

For example, based on the solutions of TTPCom Ltd and ADI (Analog Devices, Inc.), the lamp mask values according to the power levels for each frequency band (GSM, DCS, etc.) are pre-tabled. This value is selected inside the terminal according to the transmission power level required by the base station and applied to the lamp mask value.

In addition, the mobile communication terminal receiving a command from the base station at power level 5 of the GSM frequency band obtains a lamp mask value from a predetermined lamp DAC table, and the ABB (analog base band: AD6535) chip has a 32 * 10-bit wide area ( wide) RAMP RAM, each lamp DAC value has a maximum value of 1024, and this value affects as a factor in determining the power level according to each power level.

In this case, the ramp DAC table includes 16 rising DACs and 16 falling DACs, and one DAC is applied to the rising duration (32 qbit) at 2 qbit intervals.

In addition, as shown in Figure 2, the rising / falling section is represented by a gentle rising / falling curve having a period of 32 qbit, where TTPCom's solution is the lamp DAC value and power in the case of the power magnitude for the rising and falling intervals Determined by the product of the DAC values, the midamble power is represented by the product of the last value of the rising ramp DAC and the ramp DAC value.

In addition, according to Skyworks' iPAC (Integrated Power Amplifier Control) module, when using the CX77306 power amplification module, it is necessary to maintain a constant power for all power levels during the rising ramp duration as shown in FIG. 3. In the case of the mobile communication terminal using the power amplification module, that is, the current amplification power amplification module, the pedestal level must be maintained for a predetermined time (about 20 ms) for the rising section during transmission power transmission to achieve stable characteristics. Because you can get.

However, in the related art, it is difficult to maintain a constant voltage level for all power levels because the voltage level is changed by each power lamp DAC. That is, the power ramp DAC for each power level is a scaling factor for power, and when the terminal is mass-produced, a unique value can be obtained for all mobile communication terminals through a calibration process, and the scaling factor value is determined differently for each power level. It is determined by the product of this value and the ramp DAC.

Therefore, in the related art, it is difficult to maintain a constant voltage level for all power levels. Accordingly, the software algorithm is modified to add a correction process for the pedestal level, as for each power level. Only then could the voltage levels be maintained for the desired period.

That is, the power level for the conventional rising ramp is determined by the product of the ramp DAC and the scaling factor, and after the algorithm modification, the pedestal level for the rising ramp becomes the pedestal scaling factor obtained during the auto-correction process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to obtain a pedestal scaling factor in a mass production process of a mobile communication terminal using a current amplification type power amplification module and to record it in the terminal.

Another object of the present invention is to record the pedestal scaling factor in the mobile communication terminal and to use it when transmitting transmission power, thereby enabling the ramp to rise while maintaining the pedestal level for a certain period of the ramp ramp mask. In this way, the call quality can be improved by improving the switching spectrum characteristics.

A feature of the present invention for solving the above object is a mobile communication terminal using a power amplification module of the current detection method, and transmits transmission power using the initial pedestal scaling factor in the mass production process; Network equipment for measuring and transmitting a transmission power value of the terminal during mass production of the mobile communication terminal; Requesting to transmit the initial pedestal scaling factor to the mobile communication terminal to transmit the transmission power in the initial pedestal scaling factor, and monitor the transmission power value of the mobile communication terminal measured by the network equipment and the initial pediment. Provides an apparatus for improving switching spectrum characteristics of a mobile communication terminal including a computer which obtains a static pedestal scaling factor for increasing or decreasing the physical scaling factor to maintain a pedestal level and records the result in the internal memory of the mobile communication terminal. It is.

Here, when the pedestal scaling factor is recorded in the internal memory, the mobile communication terminal transmits transmission power using the pedestal scaling factor recorded in the internal memory during the pedestal period.

According to another aspect of the present invention, after determining an initial pedestal scaling factor corresponding to a pedestal level required for a mobile communication terminal by a computer, the initial pedestal scaling factor is transmitted to the mobile communication terminal to request transmission power transmission. Process of doing; Monitoring a transmission power value transmitted from a mobile communication terminal to an initial pedestal scaling factor according to the transmission power transmission request and confirming that the pedestal level is satisfied; Increasing or decreasing the initial pedestal scaling factor to determine a pedestal scaling factor that satisfies the pedestal level and then writing the pedestal scaling factor to an internal memory of the mobile communication terminal; A method of improving switching spectrum characteristics of a mobile communication terminal, the method comprising maintaining a pedestal level by transmitting transmission power using a pedestal scaling factor recorded in an internal memory during a predetermined pedestal period in the mobile communication terminal. To provide.

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

According to the present invention, a separate pedestal scaling factor is obtained from a mobile communication terminal using an integrated power amplifier control (iPAC) module during mass production of the terminal and recorded in the terminal, and transmitted using the pedestal scaling factor from the mobile communication terminal. By transmitting power, the call quality is improved by tuning the switching spectrum characteristic. In this case, the pedestal correction configuration for obtaining the pedestal scaling factor has a configuration as shown in FIG. .

That is, in the present invention, the pedestal scaling factor is separately obtained, and as illustrated in the accompanying drawings, the switching spectrum characteristic of the mobile communication terminal 41 is implemented by maintaining the pedestal level for a predetermined time in a rising period. Will be improved.

Here, the pedestal scaling factor is obtained according to the method of obtaining the power level scaling factor, for example, scaling to output a desired power level from the scaling factor initial value in a test mode state of a GSM network device such as A8960 of Agilent Technologies. By decreasing or increasing the factor, we get a static scaling factor.

Referring to FIG. 4, a pedestal correction configuration for obtaining such a pedestal scaling factor, the mobile communication terminal 41 is a terminal equipped with a power amplification module that requires an integrated power amplifier control (iPAC) module. It is connected to the computer 43 through the terminal interface equipment 42.

Then, the computer 43 sets the network equipment (e.g., A8960 from Agilent Technologies) 44 connected to the test mode, and requests the mobile communication terminal 41 to transmit transmit power in an initial pedestal scaling factor. Then, while monitoring the transmission power value of the mobile communication terminal 41 measured by the network equipment 44, the static pedestal scaling factor is increased or decreased while the required pedestal scaling factor is obtained. The distal scaling factor is obtained, and the pedestal scaling factors thus obtained are recorded in the form of a table in the mobile communication terminal 41 so that the pedestal scaling factor is used whenever the transmission power is transmitted.

In this way, when the pedestal scaling factor table is recorded in the internal memory (NVRAM) of the mobile communication terminal 41, the pedestal scaling factor recorded in the factor table for a certain period in a portion where the internal rising ramp DAC is applied. By modifying to apply, the corresponding pedestal power scaling factor can be applied regardless of the power level.

Here, the predetermined period means a pedestal period, but not necessarily the same for each frequency band and power level, but generally means a period of about 18 kHz to 20 kHz.

In addition, the first starting value of the internal rising ramp DAC has a size of '0', and after determining a pedestal level value in dBm units in which switching characteristics are most likely to appear during subsequent pedestal periods, this value is set. Obtaining a possible pedestal scaling factor will allow the iPAC module to use the power amplification module effectively.

That is, in FIG. 4, the desired pedestal scaling factor value may be recorded in the mobile communication terminal 41 using software that can control the mobile communication terminal 41 and the network equipment 44 using the computer 43. And, the pedestal level converted in dBm unit is set to the network equipment 44 to the expected power value (expected power value), each time the mobile communication terminal 41 transmits the transmission power network equipment 44 You can observe the pedestal power while monitoring.

At this time, the initial pedestal scaling factor cannot maintain the correct pedestal level, and monitors the pedestal power level while increasing or decreasing the pedestal level value, and the desired pedestal power is monitored from the monitoring result. The scaling factor to be output, that is, the pedestal scaling factor, is found and recorded in the memory inside the mobile communication terminal 41.

Accordingly, the mobile communication terminal 41 transmits the transmission power by using the pedestal scaling factor, so that the ramp rise while maintaining the pedestal level for a certain period of the rising ramp mask every time the transmission power is transmitted. It becomes possible.

For example, assuming that the pedestal level of the mobile communication terminal 41 is 400 mV, an operation of obtaining a pedestal scaling factor in a terminal mass production process in order to improve switching spectrum characteristics of the mobile communication terminal is attached. A description with reference to FIG. 6 is as follows.

First, the computer 43 sets the network equipment 44 in the test mode to obtain the pedestal scaling factor, and connects the mobile communication terminal 41 using the terminal interface equipment 42.

When the pedestal level necessary for the mobile communication terminal 41 is determined (400 mV) in this state (step S61), the computer 43 determines the initial pedestal scaling factor corresponding to the pedestal level (step S61). S62), by transmitting the initial pedestal scaling factor to the mobile communication terminal 41 through the terminal interface equipment 42, requesting the mobile communication terminal 41 to transmit transmit power to the initial pedestal scaling factor. Done.

In this way, when the mobile communication terminal 41 transmits the transmission power in the initial pedestal scaling factor, the network equipment 44 measures the transmission power of the mobile communication terminal 41 and transmits it to the computer 43. .

Then, the computer 43 monitors the transmission power of the mobile communication terminal 41 measured by the network equipment 44 (step S63), and checks whether the pedestal level determined above is satisfied (step S64).

At this time, the computer 43 increases or decreases the initial pedestal scaling factor according to the transmission power at that time when the pedestal level is not satisfied (step S65), and then moves the pedestal scaling factor again to mobile communication. By transmitting to the terminal 41, the mobile communication terminal 41 requests the transmission power to be transmitted in the pedestal scaling factor previously increased or decreased.

In this way, when the mobile communication terminal 41 transmits the transmission power in the initial pedestal scaling factor, the network equipment 44 measures the transmission power of the mobile communication terminal 41 and transmits the transmission power to the computer 43. In addition, the computer 43 monitors the transmission power of the mobile communication terminal 41 measured by the network equipment 44 and checks again whether the pedestal level determined above is satisfied.

Through this series of procedures, the transmission power of the mobile communication terminal 41 is continuously monitored while increasing or decreasing the initial pedestal scaling factor to confirm whether the pedestal level determined above is satisfied. If it is confirmed that the value is satisfied, then the pedestal scaling factor at that time is determined as the final pedestal scaling factor to be applied to the mobile communication terminal 41 (step S66), and the computer 43 determines the pedestal thus determined. The scaling factor is recorded in the internal memory of the mobile communication terminal 41 (step S67).

Next, when the pedestal scaling factor is recorded in the internal memory of the mobile communication terminal 41, the mobile communication terminal 41 transmits the transmission power using the pedestal scaling factor. An example of applying a lamp DAC for transmitting power transmission will be described with reference to FIG. 7.

For example, in transmitting the transmission power in the mobile communication terminal 41, the lamp DAC is divided into a total of 16 sections in the ramp rising section, and the section in which the pedestal level is to be maintained is selected from the lamp DAC [1] ~. Assuming that it is a section up to the lamp DAC [8], the first start of the lamp DAC (lamp DAC [0]) has a magnitude of '0' (step S71).

Subsequently, in the section (dir 18 ms) from the lamp DAC [1] to the lamp DAC [8], the transmission power is sent using the pedestal scaling factor previously recorded in the internal memory (steps S72 to S74). The pedestal level is maintained during the pedestal section.

After that, when the pedestal period passes, the transmission power is transmitted using the existing lamp DAC until the end point of the ramp rising period for transmitting transmission power, that is, until the midamble power is reached (steps S75 to S77).

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention obtains and records the pedestal scaling factor in the terminal during the mass production of the mobile communication terminal using the current amplification power amplification module, so that the rising ramp mask is used when the mobile terminal transmits the transmission power. It is possible to ramp up while maintaining the pedestal level for a period of time, thereby maintaining the pedestal level for a period of time, thereby improving switching spectral characteristics and further improving call quality.

Claims (3)

A mobile communication terminal using a current amplification power amplification module and transmitting transmission power using an initial pedestal scaling factor during mass production; Network equipment for measuring and transmitting a transmission power value of the terminal during mass production of the mobile communication terminal; Requesting to transmit the initial pedestal scaling factor to the mobile communication terminal to transmit the transmission power in the initial pedestal scaling factor, and monitor the transmission power value of the mobile communication terminal measured by the network equipment and the initial pediment. Switching spectrum of a mobile communication terminal, comprising: a computer for obtaining a static pedestal scaling factor for increasing or decreasing the fur scaling factor to maintain a pedestal level and recording it in an internal memory of the mobile communication terminal; Property improving device. The method of claim 1, When the pedestal scaling factor is recorded in the internal memory, the mobile communication terminal transmits transmission power using the pedestal scaling factor recorded in the internal memory during the pedestal period. Switching spectrum improvement device. Determining, by the computer, an initial pedestal scaling factor corresponding to a pedestal level required for the mobile communication terminal and transmitting the initial pedestal scaling factor to the mobile communication terminal to request transmission power transmission; Monitoring a transmission power value transmitted from a mobile communication terminal to an initial pedestal scaling factor according to the transmission power transmission request and confirming that the pedestal level is satisfied; Increasing or decreasing the initial pedestal scaling factor to determine a pedestal scaling factor that satisfies the pedestal level and then writing the pedestal scaling factor to an internal memory of the mobile communication terminal; Switching the mobile communication terminal to maintain a pedestal level by transmitting transmission power using a pedestal scaling factor recorded in an internal memory during a predetermined pedestal period in the mobile communication terminal; How to improve spectral characteristics.

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