KR101179794B1 - Method and apparatus for determining calibration value to calibrate dynamic range of RF circuit in Rx/Tx Transition gap of a communication system - Google Patents

Abstract

The present invention provides a method and apparatus for determining an adjustment value for adjusting an operating range of a radio frequency circuit in a transmission / reception transition period of a communication system.

In the present invention, the communication system recognizes the maximum and minimum values of the signal power by using automatic gain adjustment at the first operation, and checks the signal powers most used within the range of the signal power, within the range of the ROM capacity. Stores certain adjustment values in the ROM. In order for a terminal to connect a call, an adjustment value corresponding to signal power used in a transmission / reception transition section is required. Search for currently received signal power among the signal powers moved from the ROM to the RAM, and if the currently received signal power does not exist, adjust an adjustment value of the signal power close to the currently received signal power among the signal powers. Select and perform the conversion, and store the converted adjustment value in the RAM corresponding to the currently received signal power.

When the call continues in the communication system, the procedure is repeated including an adjustment value corresponding to the stored signal power.

RTG, Calibration, Adjustment, ROM, RAM, Change, Adjustment, Transmit / Receive Transition Section

Description

Method and apparatus for determining calibration value to calibrate dynamic range of RF circuit in Rx / Tx Transition gap of a communication system

1 is a timing diagram illustrating calculation of adjustment values according to signal power between uplink and downlink according to a preferred embodiment of the present invention.

2 is a flow chart showing an adjustment operation for signal power in a communication system according to a preferred embodiment of the present invention.

3 is a table showing an example of adjustment values stored in a ROM in accordance with a preferred embodiment of the present invention.

4 is a table showing adjustment values updated at the time of a call, including adjustment values initially generated according to a preferred embodiment of the present invention.

5 is a block diagram of a communication system according to a preferred embodiment of the present invention.

The present invention relates to a mobile communication system, and provides a method and apparatus for shortening an adjustment value calculation for a signal power currently received in a transmission / reception transition section.

In a time division duplex (TDD) mobile communication system, uplink and downlink are divided by time, and a transmission / reception transition period (hereinafter referred to as RTG) is defined between the uplink and the downlink. exist. The RTG is an interval between the uplink and the downlink transmitted after the uplink, during which the base station switches from the receive mode to the transmit mode and the terminals switch from the transmit mode to the receive mode.

The downlink refers to a link sent from the terminal to the base station, and the uplink refers to a link sent from the base station to the terminal. In a communication system, a terminal receives a signal of a base station using a radio frequency integrated circuit (RFIC), and it is necessary to calculate a calibration value before starting the reception. The adjustment value is used to adjust the operating range of the signal sent from the RFIC of the terminal to the modem. Since the downlink is followed by the RTG, the terminal must calculate the adjustment value during the RTG between the downlink and the uplink.

In the communication system, the uplink and the downlink are repeated. At this time, if the adjustment value corresponding to the signal power transmitted from the base station is accurately calculated at each RTG, the control unit of the RFIC takes a heavy load and the processing of the control unit is inconvenient. There was a problem.

The present invention devised to solve this problem provides a method and apparatus for quickly calculating an adjustment value corresponding to pilot signal power in a transmission / reception transition period.

In a method of determining an adjustment value for adjusting an operating range of a radio frequency circuit (RFIC) in a transmission and reception transition period of a communication system according to an embodiment of the present invention,

Recognizing a maximum value and a minimum value of the signal power of the pilot signal subjected to the automatic gain adjustment and generating and storing adjustment values corresponding to the signal powers between the maximum value and the minimum value;

Searching for a current signal power of a pilot signal received in a transmission / reception transition section among the stored signal powers when a call is initiated;

Converting the selected adjustment value corresponding to the current signal power by selecting an adjustment value of the signal power closest to the current signal power among the stored signal powers when the current signal power does not exist among the signal powers; and,

And determining the converted adjustment value as an adjustment value for adjusting an operating range of the radio frequency circuit.

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According to an embodiment of the present invention, an apparatus for determining an adjustment value for adjusting an operating range of a radio frequency circuit (RFIC) in a transmission and reception transition period of a communication system,

RFIC for transmitting and receiving radio signals,

A ROM for recognizing a maximum value and a minimum value of the signal power of the pilot signal subjected to the automatic gain adjustment and generating and storing an adjustment value corresponding to the signal powers between the maximum value and the minimum value;

A RAM for receiving and storing adjustment values corresponding to the signal powers stored in the ROM when a call is initiated;

Search for the current signal power of the pilot signal received in the transmission / reception transition period among the stored signal powers,

If the current signal power does not exist among the signal powers, an adjustment value of the signal power closest to the current signal power among the stored signal powers is selected to convert the selected adjustment value corresponding to the current signal power, and And a control unit for determining the converted adjustment value as an adjustment value for adjusting the operation range of the radio frequency circuit.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that those skilled in the art may better understand the detailed description of the invention that follows.

Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention. One of ordinary skill in the art should recognize that the disclosed concepts and specific embodiments of the invention may be readily used as a basis for modifying or designing other structures for achieving the same purposes of the present invention. Those skilled in the art should also recognize that structures equivalent to the invention do not depart from the spirit and scope of the broadest form of the invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted.

The main subject of the present invention is to quickly calculate an adjustment value for adjusting the operating range of a radio frequency circuit (RFIC) in a transmission / reception transition section of a signal section in a communication system.

1 is a timing diagram illustrating calculation of adjustment values according to signal power between uplink and downlink according to a preferred embodiment of the present invention.

When the power enable signal is applied, the synchronization enable signal and the RFIC enable signal are applied together to start the communication circuit of the terminal. The reception gain 120 indicating the signal power of the pilot signal currently received is provided from the AGC of the modem to the controller of the RFIC immediately before the transition indication signal indicating the transition from the transmission mode to the reception mode is low. The control unit generates an adjustment instruction signal during the T _{RX_CAL} 110 to adjust the operation range of the RFIC. At this time, during T _{RX_SETTING} slightly longer than T _{RX_CAL} 110, the hardware elements of the RFIC are set to operate in a reception mode. When the adjustment and setting of the RFIC is completed, the antenna starts to operate in the reception mode, and the received data signal starts to be generated from the RFIC after T _{RX_LATENCY} .

That is, the adjustment section 110 as much as T _{RX_CAL} is located between the uplink and the downlink, and during the adjustment section 110, the terminal receives a reception gain (RX_GAIN) 120 indicating the signal power of the currently received pilot signal. After receiving from the AGC (Automatic Gain Controller) circuit of the modem, the adjustment value corresponding to the signal power is determined, and then the operating range of the RFIC is adjusted by the adjustment value.

In more detail, the adjustment value may represent on / off and gain to be adjusted for at least one signal gain controller included in the RFIC. In this case, the reception gain 120 refers to a gain of a signal that is provided from the RFIC to the modem and then passed through the AGC in the modem. The adjustment value is stored in a RAM that can be referenced by the control unit of the RFIC. Hereinafter, a procedure of storing adjustment values for possible signal powers of a signal received by the terminal in the RAM will be described.

TRX_SETTING means the time for enabling the receiver elements of the RFIC so that the terminal can operate in the reception mode. RX IQ means a data signal provided from the RFIC to the modem.

2 is a flowchart showing an adjustment operation for signal power in a communication system according to a preferred embodiment of the present invention.

After the power is applied in step 200, it is determined whether the communication system is the first use, and if it is the first use, the process proceeds to step 210; otherwise, the process proceeds to step 220. In step 210, the terminal recognizes the maximum and minimum values of the signal power range by using the result of the automatic gain adjustment for the pilot signal, checks the signal power values most used within the signal power range, and reads the ROM. In step 220, predetermined adjustment values corresponding to the signal powers are stored in the ROM within a range allowed by the capacity of.

When the call is initiated, the terminal moves the adjustment values stored in the ROM to the RAM in step 220. In step 230, the terminal searches for the current signal power of the pilot signal received from the modem from among the signal powers stored in the RAM just before the transmission / reception transition section (RTG) of the communication system starts.

In operation 240, it is determined whether the provided current signal power is present among the signal powers stored in the RAM. If not, the operation proceeds to operation 250. In step 250, the terminal selects an adjustment value of the signal power as close as possible to the provided current signal power among the signal powers stored in the RAM, and is determined in advance with respect to the selected adjustment value according to the current signal power. The lower bits are converted. In operation 260, the current signal power and the converted adjustment value are stored in the RAM, and then operation 270 is performed.

In step 270, the terminal adjusts the operation range of the RFIC according to the converted adjustment value. On the other hand, if the current signal power is present in the RAM in step 240, the terminal proceeds directly to step 270 to select an adjustment value suitable for the signal power stored in the RAM and according to the selected adjustment value. Adjust the operating range.

In step 280, the terminal determines whether the call continues, and if the call ends, the operation is terminated. If the call continues, the operation proceeds to step 290 and the signal power of the pilot signal is searched for the next RTG. Return and repeat the above procedure.

3 is a table showing an example of adjustment values stored in a ROM according to a preferred embodiment of the present invention.

Referring to FIG. 3, the adjustment values corresponding to the signal power values are stored in five ranges from 1 to ⑤, and more signal powers and adjustment values may be stored if the capacity of the ROM allows. Among the signal power values, ① and ⑤ are minimum and maximum values of the signal power, and ②, ③, and ④ are signal power values having a high frequency of occurrence between the minimum and maximum values. The adjustment values stored in the ROM are transferred to the RAM for reference by the control unit of the RFIC during the call, and the control unit can use the adjustment value corresponding to the current signal power value among the adjustment values without calculation.

4 illustrates adjustment values updated during a call, including adjustment values initially generated according to a preferred embodiment of the present invention.

Referring to FIG. 4, initially, only the adjustment values ① to ⑤ moved from the ROM are stored in the RAM.

If the current signal power does not exist by searching the RAM in the RTG section, the controller selects the signal power closest to the current signal power in the RAM, and lowers an adjustment value corresponding to the close signal power according to the current signal power. Convert only one to three bits to specify the converted adjustment value corresponding to the signal power. The current signal power and the converted adjustment value are stored in the RAM for future reference. The converted adjustment values are added within the range allowed by the RAM capacity.

5 is a configuration diagram of a communication system according to a preferred embodiment of the present invention.

Referring to FIG. 5, the controller 510 analyzes signal power of a pilot signal received through the RFIC 550 to find a minimum value and a maximum value, and searches for signal powers that are frequently used among the signal powers. The corresponding adjustments are calculated and stored for the signal powers up to the capacity allowed by ROM 520. When the call is initiated, the RAM 530 retrieves and stores adjustment values corresponding to the signal powers stored in the ROM 520. When the RTG starts, the controller 510 checks the current signal power and searches whether there is a value equal to the current signal power among the signal powers stored in the RAM 530. If a value equal to the current signal power is present in the RAM 530, the corresponding adjustment value stored in the RAM 530 is used. On the other hand, if the same signal power value does not exist, the controller 510 selects a value close to the current signal power among the signal powers stored in the RAM 530, and then selects a lower one of the adjustment value corresponding to the selected signal power value. Only 3 bits are converted and the converted adjustment value is applied to the adjustment of the RFIC 550 corresponding to the current signal power.

In addition, the current signal power and the converted adjustment value are stored in the RAM 530, and may be immediately referred to when the mobile terminal requires an adjustment value for the signal power.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. As an example of a modification, only the example of the terminal has been described, but the present invention can be easily applied to a device including a communication device or a communication module including a device capable of performing communication without significant modification.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

The present invention is characterized in that processing is performed quickly by importing a previously calculated adjustment value without repeating the adjustment value calculation in the transmission / reception transition period of the signal section in the communication system.

The present invention has the advantage of reducing the calculation time of the adjustment value for the RFIC only by searching the memory without the need for duplicate calculations.

Claims (4)

A method for determining an adjustment value for adjusting an operating range of a radio frequency integrated circuit (RFIC) in a transmission / reception transition period of a communication system, Recognizing a maximum value and a minimum value of the signal power of the pilot signal subjected to the automatic gain adjustment, generating and storing adjustment values corresponding to the signal powers between the maximum value and the minimum value; Searching for a current signal power of a pilot signal received in a transmission / reception transition section among the stored signal powers when a call is initiated; Converting the selected adjustment value corresponding to the current signal power by selecting an adjustment value of the signal power closest to the current signal power among the stored signal powers when the current signal power does not exist among the signal powers; and, And determining the converted adjustment value as an adjustment value for adjusting an operating range of the radio frequency circuit. The method of claim 1, wherein the converting process comprises: And converting predetermined lower bits of the selected adjustment value. An apparatus for determining an adjustment value for adjusting an operating range of a radio frequency integrated circuit (RFIC) in a transmission / reception transition section of a communication system, RFIC for transmitting and receiving radio signals, A ROM for recognizing a maximum value and a minimum value of the signal power of the pilot signal subjected to the automatic gain adjustment and generating and storing adjustment values corresponding to the signal powers between the maximum value and the minimum value; A RAM for receiving and storing adjustment values corresponding to the signal powers stored in the ROM when a call is initiated; Search for the current signal power of the pilot signal received in the transmission / reception transition section among the stored signal powers, and if the current signal power does not exist among the signal powers, the signal closest to the current signal power among the stored signal powers. And a controller configured to select an adjustment value of power to convert the selected adjustment value corresponding to the current signal power and determine the converted adjustment value as an adjustment value for adjusting an operating range of the radio frequency circuit. Adjustment value determining device. The method of claim 3, wherein the control unit, And converting predetermined lower bits of the selected adjustment value upon conversion of the selected adjustment value.

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