KR20010011515A - Method for controling power level of tx/rx rf signal in wireless local loop - Google Patents

Abstract

PURPOSE: A method for controlling power levels of transceiving signals in a wireless subscriber interfacing device is provided to linearize non-linear factors influencing a transceiving power control, according to a pause control model, so as to adaptively control transceiving power levels of the wireless subscriber interfacing device through the linearizing process. CONSTITUTION: A wireless subscriber interfacing device inputs fundamental data extracting data according to each set, and extracts system characteristics(410,412). The interfacing device generates a system model by using the extracted data, and finds a linearized formula(I) which does not perform a control and a linearized formula(II) capable of performing a control(414). The interfacing device decides whether error ranges of the sets are within required ranges according to the linearized formulas, by using the extracted data(416). If not, the interfacing device extends the number of sets for being used as samples to repeatedly perform the operation of the step '412'(417). If the error ranges are within the required ranges, the interfacing device finds a relation between an input variable and an output variable, which is appropriate for the system model, by using the linearized formula(II)(418). The interfacing device performs a set compensation according to the formula(II)(420). If measured values of the sets and the linearized formulas are applied, and if the error ranges are out of limitations, the interfacing device controls levels of maximum values and minimum values of the sets through a compensation model parameter linearization(II) operation, and repeatedly performs(422). If the error ranges are not out of the limitations, the interfacing device performs a down processing for a program(P/G) of every set(424).

Description

Transmitting / Receiving Signal Power Level Control Method of Wireless Subscriber Access Equipment {METHOD FOR CONTROLING POWER LEVEL OF TX / RX RF SIGNAL IN WIRELESS LOCAL LOOP}

The present invention relates to a method for controlling a transmit / receive signal power level by a wireless subscriber access device, and in particular, by linearizing nonlinear factors affecting power control according to a fuzzy control model, thereby controlling the transmit / receive power level of the wireless subscriber access device. It is about a method.

A typical Wireless Local Loop (WLL) system has a system configuration as shown in FIG. That is, referring to FIG. 1, the wireless subscriber network system includes a WLL switch 144, a base station controller 130, a base station 120, 120-1, and a wireless subscriber access device 110, 110-1. In addition, a data communication matching device and a home location register for data service are configured. The wireless subscriber access device 110 is subscribed as a terminal 50, 50-1, facsimile 60, 60-1, and the like. In the wireless subscriber network system, the wireless subscriber access device (110, 110-1) and the base station (120, 120-1) is wirelessly interconnected through the air and the voice data and control data through the corresponding channel connected Transmission and reception is performed.

2 shows a schematic internal block diagram of the radio frequency processing apparatus in the radio subscriber access apparatus for transmitting and receiving such data. Referring to the conventional power control method of the wireless subscriber station in transmitting and receiving data as a reference to FIG. 2, first, the wireless subscriber station stores a code value for an ideal reception signal in a data table in advance. . And according to the received signal is set to transmit the signal through a certain rule.

The received signal is gained by the received signal gain adjusting stage 218 through the duplexer 210, the low noise amplifier 212, the radio frequency processing stage 214, the intermediate frequency processing and the amplifying stage 216 provided in each set. Adjusted to the baseband processor 220. This is then transferred to the controller 230 to undergo appropriate processing. In the case of the transmission signal, the baseband processor 220 outputs the corresponding transmission signal under the control of the controller 230, and the output signal is gain-adjusted by the transmission signal gain adjusting stage 222, and the intermediate frequency. After being amplified to an intermediate frequency by the processing and amplifying stage 224, it is converted into a radio frequency signal through the radio frequency processing stage 226, and is wirelessly transmitted through the duplexer 210 by amplification of the amplifier 228.

On the other hand, the above setting is made, the corresponding value for the transmission power is calculated for each of the various wireless subscriber devices, and then the average value of the calculated values is calculated and the result is applied to the data table. Thereafter, a set correction value at the reception power level of -90 dBm is input to each wireless subscriber access device, the transmission power levels of the various wireless subscriber access devices are measured based on this, and a data table is created accordingly. The average data table of all the wireless subscriber access devices is prepared by taking the average of the data tables. In this case, in order to achieve correction for each set, the maximum value Max and minimum value Min are applied for each transmission frequency. Finally, iteratively corrects the data table in consideration of the overall system performance and uses the optimal data table value in the result.

However, the above process requires a relatively long processing time, and at the same time, the performance of the system depends on the electronic components embedded in the manufacture of the wireless subscriber interface and the ability of the person to perform the manufacturing process and system optimization. The problem arises. This means that problems may arise in the production of standardized and appropriate products.

In addition, in a conventional WLL system, the frequency band defined for use on the base station and the wireless subscriber access device is characterized by having a relatively wider range than other communication devices (mobile handsets, etc.), which is a wireless subscriber. It has been a source of difficulty in bringing the device to optimal system performance. More specifically, when the signal level extracted from the transmission power level and the reception power level controls the transmission and reception level of the wireless subscriber device based on the data table, the value of the data table averaged with each device does not match. In this case, inter-modulation occurs, resulting in a skewed skew based on the data table during open loop power control and measurement of maximum / minimum power level and sensitivity. This may cause a power level shake and cause an undesirable result. As a result, the conventional power control method in the wireless subscriber device causes a problem that does not satisfy the needs of the user in terms of system reliability.

In addition, the conventional power control method as described above has a problem that greatly affects the characteristics of single tone sensitivity reduction and intermodulation spurious response attenuation.

Accordingly, an object of the present invention is to linearize nonlinear factors affecting transmission / reception power control in a wireless subscriber access device according to a fuzzy control model, thereby making the transmission / reception power level of the wireless subscriber access device more adaptive. In providing.

In order to achieve the above object, the present invention provides a first process of generating a linearization model by generating a fuzzy control model in a nonlinear system and extracting a correction value corresponding to each set, and a minimum power value and a maximum in the system. And a second process of adding a predetermined displacement to the linearization model generated in each set as a reference of the power value, and a third process of performing compensation at a point where the power value is saturated as the added displacement. Suggest a method.

1 is a system configuration of a typical wireless subscriber access device to which the present invention is applied.

Figure 2 is a schematic internal block diagram of a radio frequency processing apparatus in a conventional wireless subscriber access device according to the prior art.

Figure 3 is a schematic internal block diagram of a radio frequency processing apparatus in the wireless subscriber access device according to the present invention.

4 is a flowchart illustrating a method for generating a transmission / reception power control system model of a wireless subscriber access device according to the present invention.

5 is a graph showing an ideal transmit and receive power state in a wireless subscriber access device.

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. Also, in the following description, many specific details such as components of specific circuits 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 details. It is self-evident to those of ordinary knowledge in Esau. 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.

Figure 3 is a schematic internal block diagram of a radio frequency processing apparatus in the wireless subscriber access device according to the present invention. In addition, the received signal gain adjusting stage 318 is provided through the duplexer 310, the low noise amplifier 312, the radio frequency processing stage 314, the intermediate frequency processing and the amplifying stage 316, in which the received signal is provided in each set. The gain is adjusted and delivered to the baseband processor 320. This is then passed to the control unit 330 to go through the appropriate processing according to the present invention. Similarly, in the case of a transmission signal, the baseband processor 320 outputs the corresponding transmission signal under the control of the control unit 330 according to the present invention, and the output signal is transmitted by the transmission signal gain adjusting stage 322. The gain is adjusted, amplified to an intermediate frequency in the intermediate frequency processing and amplifying stage 324, and then converted into a radio frequency signal through the radio frequency processing stage 326, and the duplexer 310 is amplified by the amplifier 328. It is sent out wirelessly. The transmitted signal is transmitted to the base station shown in FIG. 1 and the corresponding process is performed.

On the other hand, in the practice of the present invention, the gain adjustment of the received signal gain adjusting stage 318 is performed by the control of a separate received signal gain controlling stage 325. The received signal gain control stage 325 achieves such control by receiving a separate received parameter adjustment signal from the controller 330. The gain adjustment of the transmission signal gain adjustment stage 322 is likewise made by the control of a separate transmission signal gain control stage 335. The transmission signal gain control stage 335 receives a separate transmission parameter adjustment signal from the control unit 330 to achieve the corresponding control.

The operation of the received signal gain control stage 325, the transmission signal gain control stage 335, and the control unit 330 is used as a reference for the transmit / receive signal power control system model generated in the operation flow according to FIG. 4. Is done.

4 is a flowchart illustrating a method of generating a transmission / reception power control system model of a wireless subscriber access device according to the present invention. The operation according to the present invention will be described with reference to this.

First, in steps 410 and 412, data for basic data extraction for each set is input to extract characteristics of the system. This operation is made by setting a sample set of 10 (EA) and determining the set count according to the ideal receiving RAS table, and thus through the input of the transmission / reception data table. In step 414, a system model is generated using the extracted data, and a linear equation [I] without control and a linearized equation [II] for control are obtained. In step 416, the extracted data is used to determine whether the error of each set is within a desired range according to the obtained linear equation. In other words, it is determined whether it is suitable for the ideal model. If the linear equation is out of the range of error for each set, if it is not suitable for the ideal model, the operation of step 412 is repeated again by increasing the number of sets used as samples in step 417, that is, increasing the amount of data. Then, the extracted linear equation is used to determine whether the error of each set is included in the desired range according to the linear equation. If it is within the desired error range in step 416, in step 418, the relationship between the input variable and the output variable suitable for the model is obtained using the linearized equation [II]. In step 420, set correction is performed according to Equation [II]. At this time, the number of input variables is minimized and the output variable is a linearized model equation with minimum error. In the case of applying the set value and the linearized formula in step 422, if the error range is out of the limit, repeat the step by adjusting the level of the maximum value and the minimum value for each set by performing the calibration model parameter linearization [II] operation in step 421. Perform. If not, in step 424, all sets of P / G are down.

In summary, the wireless subscriber access device in FIG. 3 receives a signal received from a base station and controls a power level so that various users can smoothly talk. At this time, each device transmits the signal level determined according to the received signal strength of the base station, and adjusts the transmission signal level according to the adjustment procedure of each signal level. When the signal is received, a value corresponding to the RSSI level corresponding to the received signal level is received and the corresponding transmission level is determined using each frequency and the external temperature. In the case of the receiver, a voltage is supplied through the received signal gain adjustment (RX_AGC_ADJ) terminal to adjust the level in the intermediate frequency amplifier IF AMP in proportion to the received sensitivity. In the case of a transmitter, a voltage is supplied through a transmission signal gain adjustment (TX_AGC_ADJ) terminal to determine a transmission level corresponding to a desired reception sensitivity and generate a desired power in the IF AMP of the transmitter.

As a result, in the present invention, in order to compensate for the difference between the reception sensitivity and the transmission power according to the frequency and the temperature in the wireless subscriber access device, the transmission power is determined by using the RSSI values of the frequency, temperature, and reception sensitivity. This operation is achieved through the application of simple linearization compared to other devices. In addition, it is difficult to solve the nonlinear characteristics when the adjustment value of each set is input using the existing average data table, which can be controlled by using a fuzzy control model that well interprets the nonlinear system.

For reference, FIG. 5 is a graph illustrating an ideal transmit / receive power state in the wireless subscriber access device.

As described above, the present invention actively compensates for transmission and reception levels according to frequency and temperature, and has an advantage of implementing a wireless subscriber access device capable of compensating for each set.

Claims (9)

In the wireless subscriber access device transmit and receive signal power level control method, A first process of generating a linearization model by extracting a correction value corresponding to each set by generating a fuzzy control model in a nonlinear system; A second process of adding a predetermined displacement to the linearization model generated for each set as a reference of the minimum power value and the maximum power value in the system, And a third process of performing compensation at a point where the power value saturates as the added displacement. The method of claim 1, wherein the first process comprises: And changing a parameter of a linearized equation according to generation of an adaptive fuzzy model through the use of a closed loop, and generating a fuzzy control model as a result of the change. In the wireless subscriber access device transmit and receive signal power level control method, Transmitting a signal level determined according to the received signal strength of the base station, and adjusting a transmission signal level according to an adjustment procedure of each signal level; Receiving a signal, after receiving a value corresponding to a received electric field strength level corresponding to the received signal level, determining a corresponding transmission level using a frequency and an external temperature according to each received signal; Supplying a voltage according to an amplification of an intermediate frequency signal according to the received reception sensitivity; And determining the transmission level corresponding to the required reception sensitivity, and supplying a voltage according to gain adjustment of the transmission signal to supply a voltage according to amplification of the intermediate frequency signal. Way. In the system model generation method according to the transmission and reception power control of the wireless subscriber access device, A first step of designating a random number of wireless subscriber access device samples, and extracting corresponding wireless system characteristic data from each designated device; A second process of generating an averaged system model from the extracted wireless system characteristic data; A third process of adding a factor causing error in power control from the generated averaged system model to a variable and linearizing the same to generate a system model according to the variable; A fourth step of applying the system characteristic data extracted according to the generated linearization system model to each wireless subscriber access device; A fifth process of determining a mutual relationship between an input variable and an output variable if the fitness is within a certain error range in the application of the system model of each device; And if the determined relationship is applied within a predetermined error in each device, setting the determined relationship as a paging gain of each device. The system model of claim 4, wherein the system model generated in the second process comprises: A system model generation method characterized by a linear equation [I] with no control and a linearized equation [II] with control. The method of claim 4, wherein the fifth process does not have a good fit within a certain error range in applying the system model of each device. And repeating the first step of extracting corresponding radio system characteristic data from each device designated as an increased grain by increasing the number of sets to be samples. The method of claim 4, wherein the sixth process is Using the linearized equation [II] to find the relationship between the input and output variables suitable for the model, And performing a set correction according to the obtained formula [II]. The method of claim 7, wherein the set correction, A method of generating a system model, characterized in that the number of input variables is minimized and the output variables are made through a linearized model equation with minimum error. The method of claim 4, wherein the determined relationship is not applied within a certain error for each device, And repeating the fifth process by adjusting a level of a maximum value and a minimum value of each set through a predetermined correction model parameter linearization [II] operation.