KR100537570B1 - Repeating System for Wireless Local Area Network(WLAN) by Frequency Channel Conversion Techniques - Google Patents

Abstract

The present invention relates to a frequency channel conversion type WLAN extension relay, and more particularly, frequency channel conversion for performing WLAN relay using different frequency channels for communication between an access point and a client. It relates to a wireless LAN expansion relay device. The frequency channel conversion type WLAN extension relay according to the present invention is characterized in that a relay is performed using different frequency channels for communication between an access point and a client for the WLAN relay. In particular, the frequency channel conversion type WLAN expansion repeater of the present invention is configured to monitor the power of the access point channel (F1) and the client channel (F2) at the same time, when implementing a channel converter for wireless LAN relay. The intermediate frequency channel signal is switched based on the result value, and the channel switching is performed according to the channel change by selecting the local switching channel. As described above, the present invention provides an effect of enabling the expansion of a signal transmission range, a high transmission speed, easy installation, and more accurate signal transmission by providing a frequency channel conversion type WLAN extension relay device between an access point and a client. You get

Description

Frequency Channel Conversion Wireless LAN Extension Relay {Repeating System for Wireless Local Area Network (WLAN) by Frequency Channel Conversion Techniques}

The present invention relates to a frequency channel conversion type WLAN extension relay, and more particularly, frequency channel conversion for performing WLAN relay using different frequency channels for communication between an access point and a client. It relates to a wireless LAN expansion relay device.

Recently, in building a local area network, the widespread use of wireless LANs has been achieved. The WLAN has been mainly used as a corporate network solution, but recently, as the number of mobile workers who work outside the office using laptops and PDAs increases, the WLAN is also used as a public WLAN service for providing Internet access services to them. It is becoming. In addition, wireless LAN is expected to be widely applied to not only computers such as laptops and PDAs but also digital home appliances in the future as the price drops rapidly due to intensifying competition and economies of scale. .

1A is an exemplary view according to a conventional wireless LAN service use state.

As shown, the configuration of the wireless LAN service is largely divided into an Internet backbone area, an Internet backbone connecting area, and a wireless LAN area.

In the Internet backbone area, a wireless internet management system (WIMS) 1 implements an internet network 3.

In the Internet backbone connection area, an access controller 5 or a router 7 for connecting another network to the internet network 3 is included. For example, the access controller 5 or the router 7 connects an intra-company network to an internet network.

In the wireless LAN area, access points 9a and 9b connected by wire to the access controller 5 or the router 7 are included. The access points 9a and 9b are connected by wire through the hub 8 to receive a signal and then wirelessly transmit the signal. That is, the signal is received by the wire and the wireless signal is converted to provide the signal. Therefore, computers 11 are connected to the access points 9a and 9b. Each of the access points 9a and 9b can connect an infinite number of users (computers).

In the conventional wireless LAN service apparatus having the above configuration, the Internet network 3 is operated under the management of the wireless Internet management system. In the company or home of the user 11, another network is formed under the management of the access controller 5 or the router 7. The access controller 5 or the router 7 performs control of connecting the Internet network 3 and the user's 11 network in the company.

The user 11 transmits and receives signals wirelessly through the access points 9a and 9b connected to the access controller 5 and the router 7 by wire. That is, when the user 11 wirelessly provides the information to be provided to the access point 9a, the access point 9a transmits the received signal to the access controller 5 through a wired line, and It is connected to the Internet network 3 under the control of the access controller 5. On the contrary, information that the user 11 wants to be provided from the Internet network 3 is transmitted to the access point 9a by wire, converted into a radio signal at the access point 9a, and provided to the user 11. Lose.

As described above, in the conventional WLAN service apparatus, WLAN control using an access point is performed. Therefore, in the conventional WLAN service apparatus, all the security, management, and other intelligent functions necessary for network management and control have been inserted into the access points 9a and 9b. Therefore, the network administrator had to manually perform all the tasks from installation to network management for each access point 9a and 9b. Therefore, it is not a big problem when constructing a small WLAN. However, when a large wireless network is to be constructed using hundreds of the access points 9a and 9b, management and installation problems are inevitably raised. . In particular, the problem of having to be installed by wire to the access point acted as a big problem when constructing a large wireless network.

In the conventional wireless LAN service apparatus, a signal is supplied to the end user from the access points 9a and 9b. However, the access points 9a and 9b are limited to available distances for supplying signals. That is, there is a limit to the distance that the signal can be supplied. Therefore, the size of implementing the WLAN network is inevitably limited, and this point has emerged as a problem in using the WLAN.

In the conventional WLAN service apparatus, as shown in FIG. 1B, a signal transmission method using a half-duplex method is used. In particular, the conventional WLAN service apparatus uses the same frequency for signal transmission. Therefore, when performing a signal transmission between the access point and the user, it was possible to transmit only after all signals on either side were received, which caused a problem that the signal transmission speed was slow. In particular, the data input to the access point is transmitted to the client after predetermined signal processing and predetermined time delay are performed in the access point. This naturally causes a problem of slowing down the signal transmission speed.

Accordingly, an object of the present invention is to provide a frequency channel conversion type WLAN extension relay apparatus capable of expanding a signal transmission size of a WLAN.

Another object of the present invention is to provide a frequency channel conversion type WLAN extended relay apparatus that performs wireless LAN relay using a different frequency channel between an access point and a client when transmitting a wireless LAN signal.

According to an aspect of the present invention, there is provided a frequency channel conversion type WLAN extension relay, comprising: a receiving unit for receiving a signal from a receiving antenna; A transmitter for transmitting a signal through a transmission antenna; Path separating means for separating the received signal of the receiving unit into a channel communicating with an access point and a channel communicating with a client; A and B intermediate frequency signal processing means for down-converting the A and B signals separated by the path separation means using different local channels so that the received signal is at an intermediate frequency; A and B amplifying means for amplifying the output signal of the A and B intermediate frequency signal processing means to have a sufficient gain; Frequency up-converting means for up-converting the output signal of the A and B amplifying means and transmitting the frequency up-converting unit; Monitoring the output signal of the A and B intermediate frequency signal processing means, controlling the channel selection of the path separation means so that the channel signal detected by the duration and intensity of the signal is above a predetermined level is selected, and the frequency up-converting means It includes switching control means for selecting a local channel applied to the relay using a different frequency channel for communication between the access point and the client.

The switching control means of the present invention, RSSI detector for detecting the signal level by inputting the output signal of the A, B intermediate frequency signal processing means; A comparator for comparing the detected value of the RSSI detector with a reference level; And channel switching control logic for controlling switching for selecting an intermediate frequency of the received signal and an intermediate frequency of the transmitted signal based on the comparison value of the comparator.

The switching control means of the present invention further includes an AGC controller for controlling gain values of the A and B amplifying means to maintain a constant output level of the transmitting antenna based on the detection value of the RSSI detector. It is composed.

Hereinafter, a description will be given of a frequency channel conversion type WLAN extension relay according to the present invention with reference to the accompanying drawings.

2A is an overall configuration diagram of a wireless LAN service apparatus according to the present invention.

As shown in the figure, in the wireless LAN service apparatus, a wireless Internet management system (WIMS) 101 implements an internet network 103.

Another network for obtaining various information from the Internet network 103 is implemented under the control of a router 107 and an access controller 105. The access controller 105 connects an intra-company network to an internet network. The hub switch 120 which performs a hub role is connected to the access controller 105 so that the Internet network 103 and another network in the company can be connected without a signal collision through the access controller 105. It is done.

A plurality of access points 109 are connected to the hub switch 120 by wire. That is, the access point 109 is provided with a signal by wire, converts it to wireless, and performs a function of providing a signal. Therefore, a plurality of user computers 111a and 111b are connected to the access point 109. Each of the access points 109 can connect an infinite number of users (computers).

In addition, the access point 109 is connected to the frequency channel conversion type WLAN expansion relay 150a, 150b of the present invention. The frequency channel conversion type WLAN expansion relay device 150a and 150b transmits and receives a signal wirelessly with the access point 109. In addition, the frequency channel conversion type WLAN expansion repeater (150a, 150b), and transmits and receives a signal wirelessly with the user computers (111a, 111b). The frequency channel conversion type WLAN extension relay 150a and 150b uses the A channel frequency when communicating with the access point 109, and communicates with the user computers 111a and 111b when communicating with the access point 109. Use the frequency of the channel. That is, it uses a frequency of a band different from the receiving frequency and the transmission frequency, and thus is configured to perform transmission and reception simultaneously. Then, the transmission signal is extended in size.

Figure 2b is a diagram illustrating the use of the frequency channel conversion type WLAN extension relay device according to the present invention.

That is, the frequency channel conversion type WLAN expansion repeater 150a of the present invention uses frequency Freq. 2 when communicating with the user computer 111a. When communicating with the access point 109, the frequency Freq. 1 is used. In this case, the frequency channel conversion type WLAN extension relay 150a should be installed at a position where communication with both the access point 109 and the user computer 111a is sufficiently possible. However, the frequency channel conversion type WLAN extension relay 150a does not require a separate installation because it transmits and receives a signal wirelessly. It just needs to be in a position where radio signals can be transmitted and received.

In the WLAN service device having such a configuration, the Internet network 103 is connected to another network in the company through the access controller 105. The access point 109 is connected to the access controller 105 through a wire line having a predetermined length. Therefore, the access point 109 is in a state capable of transmitting and receiving signals with the Internet network 103 through a wired line.

In addition, the access point 109 performs a function of transferring data transmitted / received with the Internet network 103 or a network within a company to a frequency channel conversion type WLAN extension relay 150a by wire. The frequency channel conversion WLAN extension relay 150a relays the received data wirelessly to the user's computer 111a.

That is, in the present invention, the frequency channel conversion type WLAN extension relay 150a relays a signal between the access point 109 connected by wire to the Internet network 103 and the user computer 111a connected by wireless. It performs the function. In this case, the frequency channel conversion type WLAN extension relay 150a configures a transmission frequency and a reception frequency differently so that transmission and reception can be performed in real time, and performs faster signal transmission.

That is, as shown in Figure 2c, since the frequency channel conversion type WLAN expansion repeater according to the present invention performs the signal transmission and reception according to the full-duplex method using a different frequency, the simultaneous transmission between the client and the access point It becomes possible to perform

Next, Figure 3 is a block diagram of a frequency channel conversion type WLAN extension relay device according to the present invention.

In accordance with an aspect of the present invention, there is provided a frequency channel conversion type WLAN extension relay including: a receiving unit for receiving a signal from the outside, an A channel unit for communicating with an access point, a B channel unit for communicating with a client, a transmitting unit for transmitting a signal to the outside, and And a control unit for controlling the A channel stage and the B channel stage.

The reception unit includes a reception antenna 200, a first band pass filter (BPF) 202 for limiting a band of a signal received from the reception antenna 200, and the first band pass filter 202. A low noise amplifier 204 that removes a noise signal from the output signal of a) and largely amplifies only the original signal, and a two-way splitter which transmits the output signal of the low noise amplifier 204 to the A channel unit and the B channel unit. (2Way Splitter: 206).

The A channel unit may include a first frequency mixer 208 for inputting a signal separated by the two-way splitter 206, mixing the applied frequency signal, and down-converting the frequency into an intermediate frequency band signal; The first intermediate frequency bandpass filter 210 for limiting the band of the mixed frequency at 208 and the first gain amplifier 212 for amplifying the output signal of the first intermediate frequency bandpass filter 210 to have a sufficient gain. And a first saw filter 214 for increasing the frequency channel selectivity in the output signal of the first gain amplifier 212.

The A channel unit includes a first frequency supply unit for supplying a reference frequency to the first frequency mixer 208. The first frequency supply unit includes a reference frequency through a first switch 240 and a first switch 240 that provide a path for supplying a reference frequency to the first frequency mixer 208 and a third frequency mixer, which will be described later. It is configured to include a PLL module channel A (242) to supply.

Similarly, the B channel unit inputs the signal separated by the two-way splitter 206, mixes with the applied frequency signal, and converts the frequency down into an intermediate frequency band signal into a second frequency mixer 216 and the second frequency mixer ( The second intermediate frequency bandpass filter 218 for limiting the band of the mixed frequency at 216, and the second gain amplifier 220 for amplifying the output signal of the second intermediate frequency bandpass filter 218 to have a sufficient gain. And a second saw filter 222 for increasing frequency channel selectivity in the output signal of the second gain amplifier 220. The signals output from the show filters 214 and 222 of the A channel section and the B channel section are applied to the third switch 228.

The B channel unit includes a second frequency supply unit for supplying a reference frequency to the second frequency mixer 216. The second frequency supplier includes a second switch 244 that provides a path for supplying a reference frequency to the second frequency mixer 216 and a third frequency mixer, which will be described later, and the second switch 244. And a PLL module channel B 246 which supplies a frequency.

Next, the controller controls a gain of the gain amplifiers 212 and 220 of the A channel unit and the B channel unit, and outputs a switch control signal of the third switch 228 and the fourth switch 238 described later ( 226). The control unit monitors the output signals of the intermediate frequency bandpass filters 210 and 218 to monitor the A channel unit and the B channel unit at the same time, and selects a path in which the duration and intensity of the signal are detected to be higher than a predetermined level. And a RSSI detector 224 for applying a detection signal to the switching controller 226. In addition to this, the controller includes a microprocessor.

The transmitter includes a third switch 228 for switching the output signal of the A channel unit or the B channel unit, a third frequency mixer 230 for mixing reference frequencies with the output signal of the third switch 228, and A power amplifier 232 for amplifying the output signal of the third frequency mixer 230 to a high output suitable for transmission; a second band pass filter 234 for limiting the output of the power amplifier 232; And a transmission antenna 236 for transmitting the output signal of the two band pass filter 234. The third frequency mixer 230 sets the output frequency of the third switch 238 which selects and provides one of a reference frequency of the A channel unit or a reference frequency of the B channel unit as the reference frequency.

In the frequency channel conversion type WLAN extension relay device of the present invention having the above configuration, signal processing is performed in the following process.

The signal is received by the receiving antenna 200, and the first band pass filter 202 limits the band of the received signal. The low noise amplifier 203 removes the noisy signal and greatly amplifies the original signal. The signal amplified by the low noise amplifier 203 is inputted to the second direction splitter 206 to simultaneously communicate the channel A for communicating with the access point 109a and the channel B for communicating with the client (user). It is separated into two paths, Channel A and Channel B, for monitoring.

The separated signals are frequency downconverted using different localities so that the frequencies F1 and F2 received by the receiving antenna are at the same intermediate frequency. That is, the channel A signal is mixed with the reference frequency provided by the PLL module channel A 242 in the first frequency mixer 208 and band limited in the first intermediate frequency bandpass filter 210. The channel B signal is mixed with the reference frequency provided by the PLL module channel B 246 in the second frequency mixer 216 and band-limited in the second intermediate frequency bandpass filter 218.

The signals frequency down-converted by the first and second intermediate frequency bandpass filters 210 and 218 have sufficient gains in the first gain amplifier 212 and the second gain amplifier 220, and then the first and second saw filters 1 and 2 are used. Through 214 and 222, a margin for the channel switching time at the third switch 228 is obtained while ensuring sufficient delay time while increasing the frequency channel selectivity.

The intermediate frequency signal selected by the third switch 228 is frequency up-converted by the third frequency mixer 230, the signal is amplified by the power amplifier 232, and then the band limiting is performed by the second band pass filter 234. It is then transmitted through the transmission antenna 236.

The frequency up-conversion in the third frequency mixer 230 converts the reference frequencies of the PLL module channels A / B 242 and 246 by mixing them with the output signals of the third switch 228, and selecting the reference frequency. To be selected opposite to the selection channel of the two-way splitter 206. That is, if the signal input through the reception antenna 200 is the frequency (F1), the signal output through the transmission antenna 236 has a frequency (F2).

Meanwhile, the channel selection switching and the switching timing of the switching controller 226 are determined as follows. 8 is an operation flowchart according to a switching operation in the frequency channel conversion type WLAN extension relay according to the present invention.

The intermediate frequency signal A and the intermediate frequency signal B of the first band pass filter 210 and the second band pass filter 218 down-converted to the intermediate frequency are input to the RSSI detector 224. The RSSI detector 224 simultaneously monitors the received signal and applies the detection signal to the switching controller 226. The switching control unit 226 operates the intermediate frequency channel selection switch so that the channel signal A or B whose signal duration and intensity is detected to be above a predetermined level is selected. The local selection switch is operated as opposed to the operation of the channel selection switch. Therefore, when the intermediate frequency channel A is selected in the channel selection switch (step 300), the local selection switch is controlled to select channel B local (step 315). On the contrary, if the channel selection switch selects the intermediate frequency B (step 303), the local selection switch selects channel A local (step 306).

In addition, the gain values of the first gain amplifier 212 and the second gain amplifier 220 are controlled based on the detection signal level of the RSSI detector 224 to maintain a constant output level of the transmitting antenna 236. To be controlled. In this case, the transmission switch 228 is operated to transmit the selected channel signal through the transmission antenna 236 (steps 315 and 306).

The transmission switch 228 turned on in steps 306 and 315 remains on until the packet data to be transmitted is completely transmitted, and is turned off when the transmission of the packet data is completed. That is, the time set for the transmission of the packet data is monitored, and when the set time ends (step 309 and 312), the packet data transmission is completed.

On the other hand, when the conditions of steps 309 and 312 are not satisfied, the transmission switch 228 is turned off and the system returns to the standby mode described later. After such control is performed, an alarm signal according to the return to the standby mode is applied to the microprocessor in the switching controller 226 (step 318).

Next, FIG. 4 is a control block diagram illustrating in detail the signal separation and selection path in the frequency channel conversion type WLAN extension relay according to the present invention.

As shown, the signal received from the receive antenna 200 is configured to be provided to the two-way splitter 206 via the receive signal interface 260. The received signal interface 260 includes a first band pass filter 202 and a low noise amplifier 204 shown in FIG. 3.

The A channel signal separated by the two-way splitter 206 is transmitted to the transmitter section through the A channel section. In order to transmit the A channel signal from the A channel unit, signal separation and signal selection must be performed by the following procedure.

The A-channel signal of the two-way splitter 206 is applied, and frequency mixing is performed to down-convert the frequency to the intermediate frequency band. The frequency mixing is done in the first frequency mixer 208. The first frequency mixer 208 is mixed with a reference frequency provided through the first switch 240 in the first PLL module channel A 242. In this case, the first PLL module channel A 242 outputs a reference frequency under the control of the microprocessor 250 described later. Accordingly, the first PLL module channel A 242 transmits / receives a PLL control signal (PLL A Cntrl Signals) and data DATA for control with the microprocessor 250. The output path selection of the first switch 240 is made by a switching control signal LO_A_SW applied by the channel switching control logic 226a under the control of the microprocessor 250.

The output signal of the first frequency mixer 208 is the channel A signal IF_RX_A_1 in the intermediate frequency band. This signal is applied to the next second signal processor A 280 through a first signal processor A 270 such as a bandpass filter. At this time, the output signal of the first signal processor A 270 is separated by the splitter 275 and applied to the second signal processor A 280 of the next stage and provided to the RSSI detector A 224a.

The RSSI detector A 224a detects a signal duration or signal level of the A channel signal to detect whether the input A channel signal is a normal signal or an abnormal signal. The detection signal of the RSSI detector A 224a is applied to the comparator A 224b, and the comparator A 224b compares the comparison value CMP_OUT_A with the reference signal CMP_REF_A and changes the channel switching control logic 226a. To provide. The RSSI detector A 224a and the comparator A 224b are included in the RSSI detector 224 of FIG. 3.

The AGC controller A 226b controls to generate the signal IF_RX_A_2 by adjusting the gain of the signal IF_RX_A_1. The AGC controller A 226b receives the control value HOLD_CNTRL_A from the channel switching control logic 226a and receives the second signal processor A. The gain value AGC_CNTRL_A is output to 280. At this time, the controlled gain value of the AGC controller A 226b is set so that the output level of the signal to be transmitted is kept constant based on the level of the signal detected by the RSSI detector A 224a. The AGC controller A 226b, the channel switching control logic 226a, and the microprocessor 250 are included in the switching control unit 226 shown in FIG.

The channel switching control logic 226a exchanges various control signals with the microprocessor 250, and also outputs a determination value according to the output value of the comparator A 224b to the microprocessor 250. Alarm).

In this way, the second signal processor A 280 receives the gain control signal of the AGC controller A 226a and adjusts the gain by a predetermined amount to output the channel A signal IF_RX_A_2 in the intermediate frequency band. The output signal of the second signal processor A 280 is output through the switch 228a and the switch 228b. The second signal processor A 280 includes a first gain amplifier 212, a first saw filter 214, and the like in FIG. 3. The two switches 228a and 228b are included in the third switch 228 of FIG. 3.

Meanwhile, the channel switching control logic 226a selects the output signal of the switch 228a according to the operation channel CH_SW, and selects the output signal of the switch 228b according to the operation or standby of the system. . The switch 228b outputs the output signal of the switch 228a or the ground signal by the control signal ISO_SW.

In addition, the channel switching control logic 226a performs control for selecting a reference frequency for frequency downconversion of the transmission signal. That is, the fourth switch 238 is a switching device configured to select one of the frequencies output from the first PLL module channel A 242 and the frequencies output from the second PLL module channel B 246. . The output signal of the fourth switch 238 is selected by the control signal TX_LO_SW applied by the channel switching control logic 226a, and the output signal TX_LO of the fourth switch 238 is the third frequency mixer. 230 is applied. The third frequency mixer 230 outputs the frequency converted transmission signal to the transmission signal interface 285. The transmission signal interface 285 includes a power amplifier 232 and a second band pass filter 234 shown in FIG.

Next, the signal of the B channel is also selected and output in the same path as the signal selection and the path of the A channel.

The B-channel signal of the two-way splitter 206 is applied, and frequency mixing is performed to down-convert the frequency to the intermediate frequency band. The frequency mixing is done in a second frequency mixer 216. The second frequency mixer 216 is mixed with a reference frequency provided through the second switch 244 in the second PLL module channel B 246. At this time, the second PLL module channel B 244 outputs a reference frequency under the control of the microprocessor 250 described later. Accordingly, the second PLL module channel B 246 transmits and receives a PLL control signal (PLL B Cntrl Signals) and data DATA for control with the microprocessor 250. The output path selection of the second switch 244 is made by a switching control signal LO_B_SW applied by the channel switching control logic 226a under the control of the microprocessor 250.

The output signal of the second frequency mixer 216 is a channel B signal IF_RX_B_1 in the intermediate frequency band. This signal is applied to the next second signal processor B 295 through a first signal processor B 290, such as a bandpass filter. At this time, the output signal of the first signal processor B 290 is separated by the splitter 265 is applied to the second signal processor B (295) of the next stage and provided to the RSSI detector B (224c).

The RSSI detector B 224c detects a signal duration or signal level of the B channel signal in order to detect whether the input B channel signal is a normal signal or an abnormal signal. The detection signal of the RSSI detector B 224c is applied to the comparator B 224d, and the comparator B 224d compares the comparison value CMP_OUT_B with the reference signal CMP_REF_B and changes the channel switching control logic 226a. To provide. The RSSI detector B 224c and the comparator B 224d are included in the RSSI detector 224 of FIG. 3.

The AGC controller B 226c controls to generate the signal IF_RX_B_2 by adjusting the gain of the signal IF_RX_B_1. The AGC controller B 226c receives the control value HOLD_CNTRL_B from the channel switching control logic 226a and receives the second signal processor B. The gain value AGC_CNTRL_B is output to 295. At this time, the controlled gain value of the AGC controller B 226c is set such that the output level of the signal to be transmitted is kept constant based on the level of the signal detected by the RSSI detector B 224c. The AGC controller B 226c is included in the switching control unit 226 shown in FIG. 3.

The channel switching control logic 226a transmits and receives various control signals (Control Signals) to and from the microprocessor 250, and also outputs a determination value according to the output value of the comparator B 224d to the microprocessor 250. Alarm).

In this way, the second signal processing unit B 295 receives the gain control signal of the AGC controller B 226c and adjusts the gain by a predetermined amount to output the channel B signal IF_RX_B_2 of the intermediate frequency band to the switch 228a.

Next will be described in detail with reference to the operation process of the frequency channel conversion type WLAN extension relay device according to the present invention having the above configuration.

5 shows an initial operation state of each switch element in the standby mode.

In the standby mode, whether the received signal is an A-channel signal or a B-channel signal should be maintained at all times. Therefore, the channel switching control logic 226a controls all of the control signals LO_A / B_SW to the high signal HIGH. By the control signal, the switch 240 has a path for supplying the reference frequency generated in the PLL module channel A 242 to the first frequency mixer 208. Similarly, the second switch 244 has a path for supplying the reference frequency generated in the PLL module channel B 246 to the second frequency mixer 216. Such path control is maintained in a state capable of receiving a signal at any time, whether it is an A channel signal or a B channel signal.

In the standby mode, the transmission signal should not be output. That is, the channel switching control logic 226a controls the control signal ISO_SW to a high signal to connect the switch 228b to ground. Accordingly, the third frequency mixer 230 is provided with a ground signal.

At this time, the switch 228a may be connected to any channel side. However, it is necessary to constantly control the switching connection state in the standby mode. In FIG. 5, the state connected to the A channel side is shown.

In the standby mode, it is not necessary to control the reference frequency output for frequency conversion of the transmission signal. Accordingly, the channel switching control logic 226a controls the control signal TX_LO_SW for selecting a frequency of the transmission signal to a low state. By the control signal, the fourth switch 238 does not output the reference frequency for converting the frequency of the transmission signal.

6 is a switching control state diagram in the A channel mode.

In the standby mode shown in Fig. 5, the RSSI detector A 224a detects the magnitude of the signal duration or signal level of the input signal and outputs it to the comparator A 224b. The comparator A 224b outputs a comparison value by comparison with a reference value to the channel switching control logic 226a.

The channel switching control logic 226a determines the received channel signal based on the comparison value, applies the determination value to the microprocessor 250, and controls the path of each switch.

Therefore, in the standby mode, when the received signal is detected on the A channel, the channel switching control logic 226a applies a high signal to the first switch 240 and a low signal to the second switch 244. In addition, a low signal is applied to the switch 228a so that a signal of the A channel can be selected, and a low signal is applied to the switch 228b so that an output signal of the switch 228a can be selected.

The A-channel received signal applied to the first frequency mixer 208 through the two-way splitter 206 by the control is mixed with the reference frequency supplied from the PLL module channel A 242 to be a received signal of the intermediate frequency band. The output is converted. In this case, the A-channel received signal has a frequency band provided by the PLL module channel A 242.

In addition, the reference frequency output from the PLL module channel B 246 is supplied to the third frequency mixer 230 through the second switch 244 and the fourth switch 238. The third frequency mixer 230 mixes the signal of the A channel applied through the switch 228a and the switch 228b with the reference frequency to generate a transmission signal of a new frequency band. In this case, the transmission signal has a frequency band provided by the PLL module channel B 246. That is, it will have a frequency of a band different from the received signal.

7 is a switching control state diagram in the B channel mode.

In the standby mode shown in Fig. 5, the RSSI detector B 224c detects the signal duration time or signal level of the input signal and outputs it to the comparator B 224d. The comparator B 224d outputs a comparison value by comparison with a reference value to the channel switching control logic 226a.

The channel switching control logic 226a determines the received channel signal based on the comparison value, applies the determination value to the microprocessor 250, and controls the path of each switch.

Therefore, in the standby mode, when the received signal is detected on the B channel, the channel switching control logic 226a applies a low signal to the first switch 240 and a high signal to the second switch 244. In addition, a high signal is applied to the switch 228a so that the signal of the B channel can be selected, and a low signal is applied to the switch 228b so that the output signal of the switch 228a can be selected.

The B-channel received signal applied to the second frequency mixer 216 through the two-way splitter 206 by the control is mixed with the reference frequency supplied from the PLL module channel B 246 to be a received signal of the intermediate frequency band. The output is converted. In this case, the B channel received signal has a frequency band provided by the PLL module channel B 246.

In addition, the reference frequency output from the PLL module channel A 242 is supplied to the third frequency mixer 230 through the first switch 240 and the fourth switch 238. The third frequency mixer 230 mixes the signal of the B channel applied through the switch 228a and the switch 228b with the reference frequency to generate a transmission signal of a new frequency band. In this case, the transmission signal has a frequency band provided by the PLL module channel A 242. That is, it will have a frequency of a band different from the received signal.

Next, FIG. 9 is a block diagram illustrating a time delay in the frequency channel conversion type WLAN extension relay according to the present invention, and FIG. 10 is a timing diagram of the frequency channel conversion type WLAN extension relay according to the present invention.

The pass time delay time Tpd must satisfy at least the following values.

Therefore, Tpd> Tcd + Ton + 30ns (Max PLD Delay).

On the other hand, the timing of sensing the packet data and controlling the switch should be made before the packet data passes through the switch, which should at least ensure a guard time (Tbd) for the time that the switch is turned on.

In addition, the switch Tsw2 occurs before Tp2 due to the time difference between the pass time delay time Tpd and the pass time Tcd of the RSSI detector 224a and the comparator 224b. Therefore, the channel switching control block needs a time delay by a small time (Tad) so that the packet data can pass through the switch and then turn off the switch.

As described above, the frequency channel conversion type WLAN extension relay according to the present invention is characterized in that a relay is performed by using different frequency channels for communication between an access point and a client for wireless LAN relaying. . In particular, the frequency channel conversion type WLAN expansion repeater of the present invention is configured to monitor the power of the access point channel (F1) and the client channel (F2) at the same time, when implementing a channel converter for wireless LAN relay. The intermediate frequency channel signal is switched based on the result value, and the channel switching is performed according to the channel change by selecting the local switching channel.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

The above-described frequency channel conversion type WLAN extended relay device according to the present invention controls two channels used for communication between an access point and a client and controls transmission and reception while simultaneously transmitting and receiving signals. You will get faster speeds. In addition, since the frequency channel conversion type WLAN expansion relay according to the present invention performs signal transmission and reception wirelessly, an effect of being easily installed can be obtained regardless of the installation location. In the related art, since the client communicates directly with the access point, there is a limitation in the installation and signal transmission range of the wired access point. However, the present invention solves this problem and solves this problem. By providing a LAN extension relay device, an effect of extending the signal transmission range and transmitting a more accurate signal can be obtained.

Figure 1a is an exemplary view according to the conventional wireless LAN service using state,

Figure 1b is an illustration of a signal transmission method of a conventional wireless LAN service apparatus,

2a is a conceptual view of operation of a wireless LAN service apparatus according to the present invention;

Figure 2b is an example of the use of the frequency channel conversion type WLAN expansion relay in accordance with the present invention,

Figure 2c is an exemplary diagram of a signal transmission method of a frequency channel conversion type WLAN extended relay device according to the present invention;

3 is a control block diagram of a frequency channel conversion type WLAN extension relay according to the present invention;

4 is a signal flow diagram of a frequency channel conversion type WLAN extension relay device according to the present invention;

5 is a switching state in the standby mode of the frequency channel conversion type WLAN extension relay according to the present invention;

6 is a diagram illustrating a switching state in an A-channel receiving mode of a frequency channel conversion type WLAN extension relay according to the present invention;

7 is a diagram illustrating a switching state in a B channel reception mode of a frequency channel conversion type WLAN extension relay according to the present invention;

8 is an operation flowchart according to channel conversion of the frequency channel conversion type WLAN extension relay according to the present invention;

9 is a time delay control configuration diagram of a frequency channel conversion type WLAN extension relay according to the present invention;

10 is a timing diagram of a frequency channel conversion type WLAN expansion repeater according to the present invention.

Explanation of symbols on the main parts of the drawings

200: reception antenna 202,210,218,234: bandpass filter

204: low noise amplifier 206: two-way splitter

208,216,230: frequency mixer 212,220: gain amplifier

214,222: Saw filter 224: RSSI detector

226: switching control unit 228,238,240,244: switch

232: power amplifier 236: transmission antenna

242,246: PLL module channel A / B

Claims (3)

A receiving unit which receives a signal from a receiving antenna; A transmitter for transmitting a signal through a transmission antenna; Path separating means for separating the received signal of the receiving unit into a channel communicating with an access point and a channel communicating with a client; A and B intermediate frequency signal processing means for down-converting the A and B signals separated by the path separation means using different local channels so that the received signal is at an intermediate frequency; A and B amplifying means for amplifying the output signal of the A and B intermediate frequency signal processing means to have a sufficient gain; Frequency up-converting means for up-converting the output signal of the A and B amplifying means and transmitting the frequency up-converting unit; Monitoring the output signal of the A and B intermediate frequency signal processing means, controlling the channel selection of the path separation means so that the channel signal detected by the duration and intensity of the signal is above a predetermined level is selected, and the frequency up-converting means And a switching control means for selecting a local channel applied to the RS, and using a different frequency channel to communicate with the access point and the client. The method of claim 1, The switching control means includes: an RSSI detector for detecting a signal level by inputting an output signal from the A and B intermediate frequency signal processing means; A comparator for comparing the detected value of the RSSI detector with a reference level; And a channel switching control logic configured to control switching for selecting an intermediate frequency of the received signal and an intermediate frequency of the transmitted signal based on the comparison value of the comparator. The method of claim 2, The switching control means further comprises an AGC controller for controlling gain values of the A and B amplifying means to maintain a constant output level of the transmitting antenna based on the detection value of the RSSI detector. Conversion type WLAN extended relay device.