KR20020059085A - Signal power control method for internet access based on Home PNA specification - Google Patents

Abstract

PURPOSE: A method for controlling transmit power for home PNA(Phoneline Networking Alliance) technology-based Internet service is provided to minimize an excessive signal attenuation or a transfer error by an excessively big signal by transferring data after automatically selecting high power or low power according to line length. CONSTITUTION: In case that the link state of a concentrator is on, the concentrator measures the peak level and noise level of a received signal(4-5) and executes the first stage power control(4-6). In the first stage power control, if the peak level of the received signal is larger than an upper threshold, the concentrator determines the strength of a transmitting signal as a low power value. If the peak level of the received signal is smaller than a lower threshold, the concentrator determines the strength of the transmitting signal as a high power value. After executing the first stage power control, the concentrator executes the second stage power control in order to adjust a received power level to a target level(4-7).

Description

Signal power control method for Internet access based on Home PNA technology

The present invention is applied to a centralized device for delivering Internet traffic to a plurality of subscribers using home PNA technology, centralizing the traffic received from each subscriber, and delivering it to the Internet, and a terminal device to which a subscriber computer or an internet application terminal is connected. It is an object of the present invention to make the communication more stable by allowing the receiving side to always have a reception signal value within a certain range.

As an example, as shown in FIG. 1, a network configuration diagram in which home PNA technology is applied is applicable to a group residence such as an apartment or a building. In general, the internet service network is connected to a router through a leased line, a frame relay, an asymmetric digital subscriber line (ADSL) wireless network, and the like, so that the centralization apparatus 1-2 can deliver internet traffic to subscribers. The centralizing device carries internet traffic on a signal modulated according to the home PNA standard (hereinafter referred to as home PNA signal) and delivers it to the terminal device through a telephone line. The terminal device separates data from the home PNA signal and terminates the terminal connection standard. It converts into a format that follows and delivers it to subscriber equipment (1-9, 1-10, computer or internet application service terminal). In addition, the centralized device and the terminal device in the same manner, traffic generated from the subscriber equipment is transmitted to the centralized device through the terminal devices (1-6, 1-7).

In the existing home PNA standard, when the home PNA signal is transmitted, two power levels of high power or low power are selected. Existing home PNA-based centralizing devices and terminal devices are fixed to low or high power. In the case of fixing at low power, the signal transmission distance is shortened. In case of fixing at high power, the reception signal is too large at a short distance, so that data errors are likely to occur, and signal interference between lines is increased.

The present invention aims to minimize the occurrence of transmission errors due to excessive signal attenuation or excessively large signals from short distance to long distance to automatically transmit data by selecting high power or low power according to the line length in order to solve the above problems. Shall be. In addition, it is possible to minimize the interference between lines by controlling the strength of the transmission signal of the transmitting side so that the strength of the signal received at the receiving side maintains a constant size so that the transmission power maintains the minimum value for transferring data normally to the receiving side. Aim.

In order to achieve the above object, one-step control to measure the received signal strength to quickly select high power or low power, and measure the received signal strength of the other side to finely adjust the transmit power of the sender to measure the received signal. It performs a two-stage control function to keep the intensity at the target value.

In the first stage, the concentrator controls the transmit signal strength when the peak level (Peak_Level) of the received signal is higher than the upper threshold value (2-1) and the low power value, and when the smaller than the lower threshold value (2-2). And, by using a remote command to the terminal side to have the same signal level. This function is performed when the port link of the concentrating device 1-2 changes from off to on, or when the peak level value of the received signal is out of a specified threshold. At this time, the terminal apparatuses 1-6 and 1-7 determine the transmission power level (high power and low power) by the remote command received from the centralizing apparatus 1-2.

In the two-stage control to keep the received power level always at a constant value, after completing the one-stage control with the continuous adjustment function, the receiving signal level of the other party received using the PCOM function is within the allowable range of the target reception value (Target_Level). After calculating whether it is within Allowable_Range), if it is out of range, adjust the signal strength to reach the target value. The concentrator 1-2 performs a transmission power control function when the received signal peak level value of the terminal device included in the PCOM signal received from the terminal device is out of the allowable range based on the target received value Target_Level. The terminal apparatuses 1-6 and 1-7 adjust the strength of the transmission signal in the same manner as the centralizing apparatus 1-2 based on the value loaded on the PCOM received from the centralizing apparatus 1-2.

Therefore, the present invention has the effect of maintaining the power level to achieve a stable data service through the power control method while maintaining the advantages of the home PNA technology that is cheaper and easier to install than other methods.

Figure 1 Network Diagram Using Home PNA Technology

2 is a reference value for the one-stage power level control of the present invention

3 is a reference value for the two-stage power level control of the present invention

4 is an operation flowchart of the concentrator for power level control

Fig. 5 Flowchart of one step control for high power and low power selection

6 is a flow chart of two-step control operation for converging to target level power

7 is a flowchart of the terminal device

In the present invention, the controller of the centralization device (1-2) and the terminal device (1-6) (1-7) to which the home PNA technology is applied transmits and receives data necessary for two-step control using the PCOM function of the home PNA. Through the function, the peak level and the noise level of the received signal are transmitted to the transmitting side so that the receiving side always has a receiving value within a certain range, so that more stable communication is possible. The variables used for the 1st and 2nd stage control are as follows.

1) Default high power level (Default_high_power_level)

Value that determines the strength of the default transmission signal at high power

2) Default low power level (Default_Low_power_level)

Value that determines the strength of the default transmission signal at low power

3) High_threshold

Reference value to change the power level (Power_Level) to Low

4) Low_threshold

Reference value to change the power level (Power_Level) to High

6) Link Status (Link_status)

It indicates the link status of the port and has a value of on when normal signal is received and off when no signal is received.

7) Peak_Level

The measured value of the received home PNA signal and the signal strength measured when receiving the signal of the header part of the home PNA packet.

8) Noise Level

A value representing the strength of the noise signal measured from the received home PNA signal

9) PCOM Peak Level (PCOM_Peak_Level)

Indicates the peak level of the other party delivered using PCOM function of home PNA

10) PCOM Noise Level (PCOM_Noise_Level)

Indicates the noise level of the other side transmitted by using PCOM function of home PNA

11) Target Level (Target_Level)

Indicates the strength of the received signal to be maintained using the signal power control function

12) Allowable Range (Allowable_Range)

A value indicating the level allowable range of the received signal. The signal power control function is performed only when the received signal is out of this value range around the target level.

Hereinafter, described in detail through the accompanying drawings and the above-mentioned parameters are as follows.

3 shows an example of the power level of the improved home PNA technology applied in the present invention, and maintains a stable power level at the upper threshold value 2-1 and the lower threshold value 2-2, which are the power levels of the existing home PNA technology. Values have been added. The upper threshold value 2-1 is a reference value for changing the power level to low, and the lower threshold value 2-2 is a reference value for changing the power level to High and is a power level used in the existing home PNA. The target level 3-2 is a reference value for maintaining the signal level at the receiving side by using the signal power control function, and maintains a stable power level by providing a certain allowable range 3-2 based on this value. The allowable range (3-2) is a value representing the allowable range of the target level of the received signal, and it is possible to perform the two-stage signal power control function only when the received signal is out of a predetermined range centered on the target level, thereby providing a stable power level. To maintain. The default high power level 3-4 is a default transmission signal level value when high power is selected, and this value determines the strength of the transmission signal of the transmitter. The default low power level 3-5 is a default transmission signal level value at low power and determines the strength of the transmission signal at low power.

4 shows the operation of the concentrator 1-2 according to the power level control, and checks the link state of each port and performs an appropriate operation accordingly. The link state has a value of on when a normal signal is received and off when a normal signal is not received.

If the link state of the centralizing device 1-2 is off, the terminal device is not connected or the terminal device is turned off. Therefore, the terminal device is normally connected (link state is on). Select the transmit side of the concentrator at high power. Therefore, the power level of the home PNA transmitting side is selected as high power (4-2), and the default high power level value for determining the high power transmission signal power is set (4-3).

If the link state is on, the signal transmitted from the terminal device is normally received. In this state, the peak level and the noise level of the received signal are measured, and power control (4-6) is performed based on this. In the first stage power control (FIG. 5), the concentrator is a low power value when the peak level (Peak_Level) of the received signal is higher than the upper threshold value (2-1), and a high power value when the lower threshold value (2-2) is smaller. The signal strength is determined by using the remote command of the home PNA, and the terminal side has the same signal level. Therefore, the first stage power control is a form in which the centralized device determines whether to transmit power to a high power or a low power, and delivers it to the terminal device.

After the first stage power control is performed, the second stage power control 4-7 is performed to set the reception power level to the target reception level. In the two-stage power control, the concentrator and the terminal device transmit the peak level and the noise level of their received signal to the other party by putting them on the PCOM signal. The magnitude of the transmit power is controlled to converge to the level value. The power control function continuously checks the strength of the received signal and the strength of the other side of the received signal and corrects it when it is out of the allowable range.

FIG. 5 shows the power control of the first stage of FIG. 4, wherein the peak level value of the signal power received by the centralization apparatus 1-2 from the terminal apparatuses 1-6 and 1-7 is higher than the threshold value 3-1. If greater than (4-6-1), the transmit power is selected as a low power (4-6-2) and transmitted to the terminal device (1-6, 1-7) via a remote command to the centralized device and the terminal device All make the transmission to a low power value.

If the received signal peak level value of the concentrator is less than or equal to the upper threshold value (3-1) and at the same time smaller than the lower threshold value (4-6-4), high power is selected as the transmission power (4-6- 5) The high power value is transmitted to the terminal device through the remote command so that both sides transmit the high power value.

If the received signal peak level value of the concentrator is less than or equal to the upper threshold value and greater than or equal to the lower threshold value, the power value of the current state may be used as it is. 6, 1-7).

6 shows a two-step power level control process for controlling the transmission power so that the peak level value of the received signal falls within the allowable range based on the target reception value. That is, the centralizing device and the terminal device can receive the PCOM signal from the other side and can know the peak level value and the noise level value of the received signal of the other side (4-7-2). Therefore, when the PCOM peak level value, which is the peak level value of the other side, is larger than the allowable range of the target level value (4-7-3), the transmission power level value is lowered (4-7-4). In addition, when the PCOM peak level value is smaller than the allowable range of the target level value (4-7-6), the transmission power level value is increased (4-7-7). In addition, the peak level and the noise level of the received signal are periodically loaded on the PCOM signal to the opposite party (4-7-5) to perform the same operation on the other party. The second stage power level control processor sets the feedback value to 1 when the relative received signal power value is within the allowable range based on the target level value so that the result can be used by another processor (4-7-8).

7 shows an operation flowchart for power control in the terminal apparatuses 1-6 and 1-7. If the link state is off, that is, if the signal is not normally received, it waits until the signal is normally received (7-1). When the remote command that transmits the transmission power value determined by the centralization apparatus is received (7-2), the transmission power of the terminal apparatus is set to the power value (high power or low power) loaded on the remote command (7-3).

If the PCOM peak level value, which is the peak level value of the concentrator loaded on the PCOM signal transmitted from the concentrator, is larger than the allowable range of the target level value (4-7-3), the transmit power level value is decreased (4-7-). 4) If the PCOM peak level value is smaller than the allowable range of the target level value (4-7-6), increase the transmit power level value (4-7-7), and periodically the peak level value of the received signal. And the noise level value are carried on the PCOM signal and transmitted to the other side (4-7-5) to perform the two-step power control function to perform the same operation on the other side (7-4).

The present invention adjusts the power level in two stages so that the receiving side can always have a reception signal value within a certain range to enable stable data transfer. In 1-stage power control, it is possible to select one of two power levels (high power and low power) that can communicate, so that a stable transmission power value for each distance can be quickly selected. Two-stage control linearly approximates the transmission power value that maintains the received signal value to enable more stable communication, so that the transmission power value maintains the optimum value for communication, enabling stable communication and excessive transmission power. Since it is not used, the interference between the lines can be minimized.

Claims (5)

The centralizing device measures the peak level and the noise level of the received signal when the link state is on. If the peak level value is larger than the upper threshold value (2-1), it is a low power value. The power control step, the centralizing device and the terminal device determine the peak level and the noise level of their received signal using the remote command of the home PNA. The centralizing device and the terminal device each have a two-step power control step of linearly controlling the magnitude of the transmission power so that the peak level value of the other side carried in the PCOM signal converges to the target level value. Transmission power control method When the link state of the concentrator 1-2 is off, the transmit power level of the concentrator is selected as high power (4-2), and a default high power level value for determining the high power transmit signal power is set ( 4-3) transmission power control method characterized in that In the first stage power control of paragraph 1, if the received signal peak level value of the centralizing device is less than or equal to the upper threshold value and is greater than or equal to the lower threshold value, the currently used power value is transmitted through the remote command. -7) transmitting power control method characterized in that the transfer to When the terminal apparatus receives a remote command that transmits the transmission power value determined by the centralizing apparatus (7-2), the terminal apparatus sets the transmission power of the terminal apparatus to the power value (high power or low power) loaded on the remote command (7-3). If the PCOM peak level value, which is the peak level value of the concentrator loaded on the PCOM signal transmitted from the device, is larger than the allowable range of the target level value (4-7-3), reduce the transmit power level value (4-7-4) , If the PCOM peak level value is smaller than the allowable range of the target level value (4-7-6), increasing the transmit power level value (4-7-7). [5] The terminal device of claim 4, wherein the terminal device periodically loads the peak level value and the noise level value of the received signal on the PCOM signal and transmits the same to the other party (4-7-5) to perform the same operation on the other party. Transmission power control method