TWI229522B - Relay system for extending wireless LAN by converting frequency channel - Google Patents

Abstract

This invention relates to a relay system for extending wireless LAN by converting frequency channel and benefits in which could expanding the transmission area of signal of wireless local network. According to the applying of this invention, the rely system for extending wireless LAN by converting frequency channel, characterized in: having a receiving part receiving signal from receiving antenna; a transmitting part transmitting signal by transmitting antenna; a path separating device separating the received signal from the receiving part to a channel which is for communicating with an access point and a channel which is for communicating with the customer; an A, B middle frequency processing device for descend the frequency from received signal to the middle frequency by means of functioning the different local channels for the separated A, B signal from the channel separating device; an A, B amplify device amplifying the signal which is in the A, B middle frequency processing device, and gaining the said signal fully; a frequency increasing shift device executing frequency increasing shift process for the inputted signal of the A, B amplify device and transmitting which by the transmitting part; a shift controlling device detecting the inputted signal on the A, B middle frequency processing device, and the duration and intensity of the signal will lasting higher than a predetermined level, the detected signal of channels will selectively controls the channel switching of the path separating device, and select the local channel which being applied to the frequency increasing shift device; there are use different channels in relay on the assess point and the communication of customer.

Description

1229522 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a relay system that extends a wireless local area network by switching channels. More specifically, it relates to the use of The different channels are used to perform the wireless LAN relay, and the wireless channel relay system is extended by changing channels. [Prior Art] Recently, wireless local area network systems are rapidly gaining popularity in the construction of short-range communication networks. This wireless LAN is mainly used in enterprise network solutions. However, with the recent increase in the number of mobile workers who use laptops or PDAs to handle business outside of the business, it has long been aimed at: Public wireless LAN services for Internet connection services are also utilized. In addition, the competition of wireless LANs is becoming increasingly fierce. Because of the economies of scale and the sharp drop in prices, not only notebook computers or PDAs, but also digital appliances are expected to be diversified in the future. It can be used in a localized way, so its use range is further expanded. Fig. 1 (a) is a diagram showing an example of the use status of a conventional wireless LAN service. As shown in the figure, the composition of wireless LAN services is largely divided into the Internet backbone area, __backbone connection area, and professional wireless LAN area. ^ In the above Internet backbone area, wireless Internet management system 1 implements Internet 3. ^ 1229522 The above Internet backbone connection area is provided with an access controller 5 or a router 7 that connects other networks to the above Internet 3. For example, the above-mentioned access controller 5 or router 7 accomplishes the task of connecting the company's network to the Internet. The wireless LAN area is provided with an access card and a port connected to the access controller 5 or the router 7 by a wired connection. The above-mentioned access points 9 and 2b are wired connections through the hub 8. After the signal is transmitted, the task of Hunan Wireless to send and receive signals is completed. That is, the function of providing a signal by wired 'and providing a signal by wireless is used for switching. Therefore, the access points 9a and 9b are connected to the computer 1. The access points 9a and 9b are connected to an unlimited number of users (computers). Such a conventional wireless LAN service device is used under the management of a wireless Internet management system, 'Internet 3 Series. In the company or home of the user 11, the network is formed again under the management of the access controller 5 or the router 7. The access controller 5 or the router 7 executes the connection between the Internet 3 and the user 11 in the company network. In addition, the user 11 is connected to the access control H5 and the router by using a wire. The access point 9a of the stomach 7 is outside, and then the signals are exchanged in a beneficial manner. That is, when the information that the user U wants to provide is provided to the access point 9a using a benefit line, the above-mentioned access point 9a transmits the provided signal to the access controller 5 胄 through a wired winding, and It is connected to the Internet 3 under the control of the taking controller 5. Conversely, the information that the user u wants to obtain from the Internet 3 is transmitted to the access point 9a, 1229522 by wire, and is converted into a wireless signal at the above access point 9a and then provided to the user u. In this way, the conventional wireless LAN service device performs control using a wireless LAN having an access point. For this reason, in the conventional wireless local area network service device, all the necessary security, management, and other intelligent functions necessary for network management and control are taken into the access points 9a and 9b and used. Therefore, all operations from the setting of each access point 9a and 9 to the network management must be done by one hand. Therefore, it is not a problem when the wireless LAN is constructed on a small scale. However, when a large-scale wireless network is to be constructed using hundreds of access points 9a and 9b, problems arise in management and settings . In particular, the so-called engineering system that must be wired to the above access point becomes a major problem in constructing large-scale wireless networks. In the conventional wireless LAN service device, the access point 9a, 9b is configured to supply a signal to an end user. However, this is limited to the distance allowed by the signals supplied at the above access points 9a, 9b. That is, there is a limit on the distance that a signal can be supplied. Therefore, it is limited to the range in which the above-mentioned wireless local area network can be realized, and this has become a problem in the use of the wireless local area network. Also, a conventional wireless LAN service device is a signal transmission method using a half-duplex method as shown in FIG. 1 (b). In particular, conventional wireless LAN service devices used the same frequency when transmitting signals. Therefore, when signal transmission is performed between the access point and the user, transmission can be performed after all the signals of either party are received. This is a cause of delay in signal transmission speed. In particular, the data 1229522 input to the access point is transmitted to the customer after performing the predetermined signal processing and time delay in the access point. This, of course, causes a problem that the signal transmission speed is delayed. [Summary of the Invention] [Problems to be Solved by the Invention] The present invention has been made in view of the problems described above, and aims to provide a medium for extending the wireless LAN network by changing the channel by expanding the signal transmission range of the wireless LAN. Relay system for the purpose. In addition, another object of the present invention is to provide a wireless LAN using a different channel between an access point and a customer to perform a wireless LAN relay during the wireless LAN signal transmission. The wireless LAN is extended by changing channels. Relay system. ', [Means for solving problems] In order to achieve the above object, according to an embodiment of the present invention, a relay system for extending a wireless local area network by changing channels is characterized by including: a receiving section that receives signals from a receiving antenna; and sends The unit sends signals through the transmitting antenna; the path separating device separates the received signals of the receiving unit into a channel for communication with the access point and a channel for communication with the customer; A and B IF signal processing devices use different The regional channel makes the receiving 彳 § 5 tiger become the intermediate frequency and down-converts the A and B signals separated by the path separation device; the A and B amplification devices make the input of the A and B intermediate frequency signal processing device The signal is amplified with sufficient gain; 1229522 frequency up-conversion device, which performs frequency up-conversion of the input signals of the A and B amplifier devices and sends it through the transmitting section; and exchanges control devices to monitor the A and B intermediate frequency The input signal of the signal processing device is selected to control the channel signal with the duration and intensity of the detected signal above a certain positioning accuracy. Channel separation device diameter exchanger, selection means being applied to the conversion region of the channel on this frequency; wherein each different access point communication channels between the customer and to execute relay. Also, the parent switching control device is provided with an RSSI detector that inputs an input signal of the intermediate frequency signal processing device of A and B to detect a signal level; a comparator that compares the detection value of the RSSI detector with a reference level; And channel switching control logic, according to the comparison value of the comparator, to perform switching control for selecting the intermediate frequency of the received signal and the intermediate frequency of the transmitted signal. In addition, the exchange control device is further provided with an automatic gain controller (AGC), and based on the detection value of the RSSI detector, the output level of the transmission antenna can be maintained to control the gain value of the A and B amplifiers to a certain degree. [Effects of the Invention] According to the present invention, since the two channels used for communication between the access point and the customer are simultaneously monitored and controlled as if receiving and transmitting, the signal transmission speed for instant transmission can be made high-speed. In addition, since the transmission and reception of signals are performed wirelessly, it can be easily installed without restrictions on the installation place. Furthermore, the direct communication between the customer and the access point is performed, so the setting and signal transmission range of the wide-access point for wired connection are limited. However, the present invention solves this problem. A repeater system is installed between customers to extend the wireless LAN network by changing channels, which can expand the signal transmission area and transmit more accurate signals. [Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail based on the attached drawings. Fig. 2 (a) is an overall configuration diagram of a wireless LAN service device according to the present invention.

As shown in the figure, the wireless LAN service device is: the wireless Internet management system (WIMS) 101 implements the Internet 103. Other networks for obtaining various information from the above-mentioned Internet 103 are implemented under the control of the router 107 and the access controller 105. The above-mentioned access controller 105 plays a role of connecting the network execution in the company to the Internet. The access controller 105 is connected to a hub switch 120 that performs the task of the hub. The Internet 103 and another network in the company may be configured to pass the access controller 105 so as not to cause a signal conflict. Work continues.

The above-mentioned hub switch 120 is connected to a plurality of access points 109 by wire. That is, the access point 109 performs a function of providing a signal by using a wired supply signal and then wirelessly switching. Therefore, the access point 1 is connected to a plurality of user computers llla and lllb. An unlimited number of users (computers) can be connected to each of the above access points 109. The access point 109 is a relay system 150a, 150b that extends the wireless local area network by switching channels according to the present invention. The above-mentioned relay systems 150a and 15b that extend the wireless LAN by changing channels use 11 1229522 wireless to transmit and receive signals with the access point 109. In addition, the above-mentioned relay systems 150a and 15b that extend the wireless local area network by changing channels use wireless to transmit and receive signals to and from user computers ma and 111b. In addition, the above-mentioned relay systems 15a and 15b that extend the wireless LAN by changing channels are using the frequency of the a channel when communicating with the access point 1009, and communicating with the user The computers llla and Ulb use the frequency of channel B for communication. That is, by using frequencies in which the reception frequency and the transmission frequency are different bands, the transmission and reception can be performed simultaneously. And extend the range of transmission signals and transmit. Fig. 2 (b) is a diagram of an example of using the relay system of the present invention to extend a wireless area network by changing channels. That is, the relay system 150a of the present invention that extends the wireless local area network by switching channels uses the frequency Freq. 2 when communicating with the user computer 1Ua. When communicating with the access point 1009, the frequency Freq · 1 is used. At this time, the relay system 150a extending the wireless LAN by changing channels must be set at a position where both the access point j09 and the user's computer ^ a can fully communicate. However, the above-mentioned relay system 15a, which extends the wireless LAN by changing channels, performs signal transmission and reception wirelessly, so no additional setting is required, as long as it is set at a position where the wireless signal transmission and reception can be performed. ° For this type of wireless LAN service device, the access controller 105 and the Internet 103 are connected to other networks in the company. The access point 109 is connected to the access controller 105 through a cable with a predetermined length. For this reason, the above-mentioned access point 109 can transmit and receive signals to and from the Internet 103 through a wired mirror line. The above-mentioned access point 109 performs the function of transmitting data that is transmitted and received with the above-mentioned Internet 103 or the company's network by wire to the relay system i5Qa that extends the wireless LAN by switching channels. The above-mentioned wireless relay system that extends the wireless LAN by changing channels is responsible for wirelessly providing the provided data to the user's computer 1Ua ^

Zhiyue runs between the access point 109 that is wired to the above-mentioned Internet 103 and the user computer 1U a that is connected wirelessly, and the relay system ma is extended by the = 网路 channel to extend the wireless LAN. Function of 2 relays. At this time, the wireless local area network and relay system 150a are configured by changing channels so that the transmission frequency and the reception frequency are different, so that the transmission and reception are performed in real time, and fast signal transmission is performed. ίίΓΓ ′ As shown in FIG. 2 (〇, according to the present invention, the relay system of a t ... line area network by switching channels performs full duplex using different frequencies.

= The signal f is transmitted and received, so it is formed at the customer and the access point to perform reception and transmission. ^ The circuit is a structural diagram of the relay system of the present invention by changing channels to extend a wireless local area network. The relay system that extends the wireless LAN by changing channels includes: self-connecting pure unit, 2 communicating with the access point, B source unit of clock communication, sending signal to the opposite side, and Control for controlling the M channel section and the B channel section 13 1229522 The receiving section is provided with a receiving antenna 200 and an i-th bandpass filter (B pf) 2 that limits a frequency band of a signal received by the receiving antenna 200. 2. With this, the output signal of the first T-pass filter 202 removes the noise signal, and only the low-noise amplifier 204 amplified by the original # number, and the output signal of the low-noise amplifier 204 is directed to the above. A two-way splitter 206 transmitted by the A-channel portion and the B-channel portion. The A channel unit is provided with: a first mixer 208, which inputs a signal separated by the disperser 206 in one direction and mixes with the applied frequency signal to down-convert the frequency into a mid-band signal; The band-pass filter 21o limits the frequency band mixed by the first mixer 208; the j-th gain amplifier 212 amplifies the output signal of the first intermediate-band pass filter 21o with sufficient gain. ; The first shift filter 214 can make the input signal of the first gain amplifier 212 improve the channel selectivity. Further, the A channel section is provided with a first frequency supply section for supplying the reference frequency to the first mixer 208. The above-mentioned frequency supply unit is provided with a first switch 240 for providing the above-mentioned first! A path for supplying the reference frequency to the mixer 20 and a third mixer to be described later; and the p L L module channel a 242, which supplies the reference frequency through the first switch 240. Similarly, the B channel unit is provided with a second mixer 216 that inputs a signal separated by the two-way diverter 206 described above and mixes it with the applied frequency signal to down-convert the frequency into a mid-band signal; a second mid-band signal; The pass filter ^ 218 limits the frequency band mixed by the second mixer 216; the gain amplifier 220 allows the round-out signal of the second intermediate-band pass filter 218 to be amplified with sufficient gain; 2 shift filter 222, 14 1229522 ^ The output signal of this second gain amplifier improves channel selectivity. The bbl system output from each of the shift wave filters 214 and 222 of the upper channel portion and the B channel portion is applied to the third switch 228. The B channel section is provided with a second frequency supply section for supplying the second mixer 216 and the reference frequency. The second frequency supply unit has a second switch 244 that provides a path for supplying a reference frequency to the second mixer 216 and a third mixer described later; and a pll module channel β 246 through which the second The switch 244 supplies a reference frequency. The control unit is provided with a switching control unit 226 for controlling the gains of the gain amplifiers 212 and 22 of the A-channel section and the B-channel section, and outputs switches of the third switch 228 and a fourth switch 238 described later. control signal. In addition, in order to monitor the A channel portion and the B channel portion at the same time, the control unit is provided with an Rssi detector (receiver index strength indicator) 224 that applies a detection signal to the exchange control unit 226 to monitor the mid-band pass filter. The input signals of 210 and 218 make the path that is detected above the level and duration of the signal a certain level will be selected. In addition, the control unit is provided with a microprocessor or the like. The transmitting unit is provided with a third switch 228 that switches the input signal of the A-channel portion or the B-channel portion; a third mixer 23, where the input signal of the third switch 228 mixes a reference frequency; a power amplifier 232, perform the same output amplification of S to send the input signal of the third mixer 230; the second band-pass filter 234, which limits the frequency band of the output of the power amplifier 232; the transmitting antenna 236, sends the second band-pass The input signal of the filter 234. In addition, the third mixer 230 sets the output frequency selected by the third switch 238 from either the standard frequency of 15 1229522 of the A channel section or the reference frequency of the B channel section as the reference frequency. 8. According to the present invention, a relay system for extending a wireless local area network by switching channels performs signal processing according to the following procedure. The signal is received by the receiving antenna 200, and the frequency band of the received signal is limited by the i-th band-pass filter 202. In addition, the low-noise amplifier 204 removes the noise signal, and at the same time greatly amplifies the original signal. The signal amplified by the above-mentioned low-noise amplifier 204 is separated by being inputted into a two-way diverter. "The eighth channel for communication with the access point 109a and the channel B for communication with the customer (user) can be monitored simultaneously. The two paths of channel A and channel β.

The separated signals each use different areas, and the frequencies F 1 and F 2 received by the receiving antennas are also down-converted like intermediate frequencies. That is, the channel A signal is between the 8th mixer 208 and? The reference frequency provided by L2 module channel a 242 is mixed and the frequency band is limited by the second-band passband 2i0. X, channel B signal is in the second mixer 216 and p LL module channel B 246 The reference frequency provided is mixed and the frequency band is limited by the second intermediate-band pass filter 218. _ In the above-mentioned first and second intermediate-band pass filters 21 and 218, the down-converted signals are provided by the first gain amplifier 212 and After sufficient gain is given to the second gain amplifier 22, the channel selectivity is improved and sufficient delay time is ensured through the second transfer filters 214 and 222, and at the same time, it has a channel exchange with respect to the third switch 228. The boundary of time. The IF signal selected by the third switch 228 is frequency-converted by the third mixer 230, and after being amplified by the power amplifier 232, 16 1229522 is sent by the second band-pass filter 234. The frequency band is further transformed by the transmitting antenna 236 transmitting the reference frequency input signals of the frequency channels A / B 242 and 246 in the third mixer 230. The signal of the phase channel antenna 200 selected by the reference frequency direction diverter 206 is Frequency ρ letter The number system has a frequency F 2. The decision of the exchange control unit 226 is performed as follows. The rate up conversion system selects the p LL module rate so that the selection of the input rate mixed into the third switch 228 is performed and two. In other words, it is formed such that the channel selection switching and switching timing output by the transmitting antenna 236 if received by the receiver

FIG. 8 is a flowchart of a switching operation in the turtle system of the present invention by changing channels to extend the wireless local area network.

At the frequency, Lai Cheng towel frequency H «wave! 2U) and 帛 2 band-passing waver 218 IF # 5 Tiger A and IF signal B are input to rssi detector a 1 The above RSSI detector 224 monitors the received signal at the same time, and applies the detection number to the parent switching control unit 226 . The above-mentioned exchange control unit 226 is such that the channel signal (A or B) detected so that the duration and intensity of the signal is above a certain level is selected to actuate the intermediate channel selection switch. And the area selection switch is operated in the opposite direction to the operation of the channel parent switch. Therefore, when the channel switching switch selects the intermediate channel A (s300), the area selection on relationship is controlled to select the channel B area (S315). Conversely, when the channel parent switch selects the intermediate frequency B (s303), the area selection is on and the channel A area is selected (s306). Furthermore, based on the detection signal level of the RSSI detector 224 as a reference, the first gain amplifier 212 and the second second Xinggushan are controlled so that the gain value of the mu / state 220 is controlled. Second: Turn-out level is used to maintain-determined position control, registration, ’, through the shipping antenna MG, actuate the send switch 228 to enable the above-mentioned selected channel signals to be sent (S 315, s 306). In the above S 306 and S 315, the opened transmission on_228 system maintains the H state f until the transmitted packet data is completely transmitted.

= Closed when ^ times. That is, the time set for monitoring the transmission of the packet is monitored when the set time is over (S 309, S312), that is, the transmission of the packet data is completed. 228 ^! Γ ^^^ δ3 ° 9 ^ S312 ^ The system returns to the standby mode described later. After the f-system is executed, the microprocessor in the exchange control unit 226 is given an alarm signal generated by returning to the standby mode (S318). Figure 4 is a control structure diagram showing the separation and selection of signals in the relay system of the wireless local area network by switching channels to extend the present invention in detail.

”= No, the signal received by the receiving antenna 2000 is supplied to the two-way diverter 206 by the receiving signal 260. The above-mentioned receiving signal interface 260 is provided with the first iBandpass amplifier and low-noise amplifier 204. 、, = The A-channel signal separated by the two-way branching device 206 is transmitted from the A-channel ^ to the transmitting side. In order to transmit the A-channel signal from the Aif channel If the signal is to be blocked, it is necessary to perform signal separation and signal selection according to the following process. The A-channel signal of the above-mentioned two-way diverter 206 is applied. In order to convert the frequency to 18 1229522, the frequency conversion is performed. This frequency mixing system It is performed in the first mixer 208. The first mixer 208 is mixed at the ip LL module channel A 242 and the reference frequency provided by the first switch 24. At this time, the above-mentioned first PLL mode The group channel A 242 is controlled by the microprocessor 250 described later to output a reference frequency. Therefore, the above-mentioned ip LL module channel A 242 transmits and receives p LL control signals (pLL A Control Signals) and the microprocessor 25. Information necessary for control. Also, the first The output path selection of the switch 240 is performed in accordance with the switching control signal (B0-SW) applied by the channel parent switching control logic 226a controlled by the microprocessor 25. The first mixer 208 described above The input signal is the channel a signal (IF_RX-A-1) in the intermediate frequency band. This signal is applied to the second signal processing unit a 280 by the processing unit A 270 like a band-pass filter. At this time, the input signal of the first signal processing unit A 270 is separated by the splitter 275 and is applied to the next second signal processing unit a 280, and is simultaneously provided to the RSSI detector A 224a. This RSSI detector A 224a is Detecting whether the input A channel signal is a normal signal is to detect the signal duration or signal level of the A channel signal. The detection signal of the above RSSI detector A 224 a is applied to the comparator A 224 b, and the above comparator A 224 b is compared with the reference signal (CM p REF_A), and the comparison value (CMP_OUT_A) is provided to the channel switching control logic 226 a. The above RSSI detector A 224 a and comparator A 224b include The RSSI detector 224 in FIG. 3.

In addition, the automatic gain controller A 226 b is an adjustment signal (I f — RX 19 1229522 A- “the gain” makes the generated signal (IF — RX — A — 2) control like the channel parent switching control logic 226 a receives Control value (HOLD — c L ~ A) 'The gain value (A GC C I \ [τ R τ λ,-KL —A) is output to the second signal processing unit A 280. At this time, the automatic gain controller described above The gain value controlled by A 226 b is set to be based on the level of 彳 5 5 tiger detected by the above rssi detector a 224 & so that the output level of the transmitted signal can be maintained constant. The above automatic The gain controller a 226 b, the channel switching control logic 226 a, and the microprocessor 25 are included in the switching control section 226 shown in Fig. 3. The channel switching control logic 226 a described above makes various control signals with the microprocessor 250. In addition, the judgment value based on the output value of the comparator A 224 b is applied to the microprocessor 250 as an alarm signal. In this way, the second signal processing unit A 280 receives the automatic gain controller. A 226 a gain control signal to perform the predetermined gain adjustment 'output Channel A signal (I f-RX-A-2) in the frequency band. The input signal of the second signal processing section a 280 is output by the switch 228 a and the switch 228 b. The second signal processing section A 280 includes The first gain amplifier 212 and the first transfer filter 214 in Fig. 3. The two switches 228a and 228b are included in the third switch 228 in Fig. 3. In addition, the channel exchange control logic 226a is corresponding to an operation channel ( CH — SW), select the input signal of the switch 228 a, and select the input signal of the switch 228 b in response to system operation or standby. The switch 228 b outputs the switch in accordance with the control signal (IS0-SW). 228 a input signal or ground signal. 1229522 In addition, the above-mentioned data processing logic 226 a is sent for execution: the second conversion of the staff is performed to select the reference frequency; :: Two becomes the selection by the first? "Module channel a: ”: Any one of the rate and the frequency of the channel output of the second PLL module = the switching element. The input signal of the fourth switch 238 is the control signal (Tχ l〇) applied by the channel exchange control logic 226a. sw)

It is selected that the input signal (Ί: χ l—0) of the fourth switch 238 is applied to the third mixer 23o. The third mixer system outputs a frequency-converted transmission signal and adds the transmission signal to the transmission signal. The transmission signal or interface 285 includes the power amplifier 232, the second band-pass filter 234, and the like shown in FIG. Secondly, the B channel signal is also selected and output in the same way as the A channel signal selection and path described above.

The B-channel signal of the above-mentioned two-way diverter 206 is applied, and frequency mixing is performed for frequency down conversion into an intermediate frequency band. This frequency mixing is performed at the second mixer 216. The second mixer 216 mixes the reference frequency provided by the second pLL module channel B 246 and the second switch 244. At this time, the above-mentioned second P L L module channel B 246 is controlled by a microprocessor 250 described later to output a reference frequency. Therefore, the above-mentioned 2 p [l module channel B 246 is used to transmit and receive p l l control signals (PLL B Control Signals) and the necessary data for control with the above-mentioned microprocessor 250. The output path selection of the second switch 244 is performed in accordance with a switching control signal (LO-B-SW) applied by the channel parent switching control logic 226a controlled by the microprocessor 25. 21 1229522 The input signal of the second mixer 216 is the channel b signal (IF_RX_B_1) in the intermediate frequency band. This signal is applied to the subsequent second signal processing section B 295 by the first h processing section B 290 like a band-pass filter. At this time, the output signal of the above-mentioned first signal processing section B 290 is separated by the splitter 265 and is applied to the subsequent second signal processing section b 295, and is simultaneously supplied to the RSSI detector B 224c.

The RSSI detector B 224 c is used to detect the signal duration or # level of the B channel signal to detect whether the input B channel signal is a normal signal. The detection signal of the RSSI detector B 224 c is applied to a comparator B 224 d. The comparator B 224 d is compared with a reference signal (CM p — Ref — b), and the comparison value (cmp — 0υτ) is compared. b) Provided to the channel switching control logic 226a. The RSSI detector B 224 c and the comparator B 224 d are included in the RSSI detector 224 of FIG. 3.

In addition, the automatic gain controller B 226 c adjusts the signal (j F —R χ gain to control as a signal (] [F—Rx —B-2)), and receives the control value from the channel exchange control logic 226 a (H〇l D — c N RL RL_B), for the second signal processing section, B 295 outputs the gain value (a GC-CNTRL-B). At this time, the above-mentioned automatic gain controller b 226 c is controlled The gain value is based on the No. 4 level detected by the above RSSI detector B 224 ^, so that the output level of the transmitted signal can be maintained constant. The automatic gain controller B 226 c Contained in the exchange control section 226 shown in Fig. 3. The above-mentioned channel exchange control logic 226a exchanges various control signals with the microprocessor 25, and will be based on the judgment value of 22 1229522 of the output value of the comparator B 224 d. It is applied to the microprocessor 250 as a full report. In this way, the signal processing unit B 295 of Bu, +, Knot 1, and the current 2 receives the above-mentioned automatic gain control & B 226 c gain. Control signal, executes the predetermined gain adjustment, that is, channel B signal (IF-RX — B-1 2) Output to switch 228 a. In the following, the operation process of the relay system for extending the wireless local area network by changing the channel of the present invention formed by the above-mentioned structure will be described in detail with reference to the drawing. Figure 5 It is the initial operation state diagram of each switching element when the watch is not in the standby mode. In the standby mode, even if the received signal is an A-channel signal or a 2-channel signal, it must maintain a constantly receivable state. Therefore, the channel parent The control logic 226 a is used to control the king of the control signal (L0-A // BS w) into a High signal. The above-mentioned control signal switch 240 has a reference frequency generated on the PLL module channel a 242. The path to the first 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 mixer 216. This path control is maintained regardless of Both the a-channel signal and the B-channel signal can always receive the signal. In addition, in the standby mode state, it is necessary to maintain the state that the transmitted signal is not output. That is, the channel exchange control logic The 226 a system controls the control signal (IS0-SW) to a High signal and connects the switch 228 b to ground. Therefore, the third mixer 230 system is supplied with a ground signal. At this time, 'the above-mentioned switch 228 a may also be connected. Go to either channel side. However, it is necessary for the 1229522 to constantly control the switching connection state in the standby mode. Figure 5 shows the state connected to the a channel side. In addition, in the standby mode state, it is not necessary to control Output at the reference frequency of the frequency conversion of the transmitted signal. Therefore, the channel switching control logic 226a controls the control signal (D X-Y-S-W) used to select the frequency of the transmission signal to the L0w state. According to the above control signal, the $ switch 238 becomes the reference frequency that does not output the frequency conversion of the transmission signal. Second, FIG. 6 is a diagram of the switching control state in the A channel mode. In the standby mode shown in Fig. 5, the RSSI detector A224a detects the signal duration or range of the signal level of the input signal and outputs it to the comparator A 224b. The comparator A 224b outputs the comparison value generated based on the comparison with the reference value to the channel switching control logic 226a. The channel exchange control logic 226a judges the received channel signal according to the above comparison value, and then applies the judgment value to the microprocessor 250 to control the path of each switch. Therefore, in the standby mode, when a received signal is detected on the A channel, the channel exchange control logic 226 a is right! The switch 240 applies the mgh signal and applies a Low signal to the second switch 244. In addition, the signal of the a channel is selectively applied to the switch 228a, and the input signal of the switch 228a is selectively applied to the switch 228b. According to the above control, the A-channel received signal applied to the first mixer 208 by the two-way diverter 206 is mixed with the reference frequency supplied by the p LL module channel a 242 and switched to the received signal in the intermediate frequency band. While being input 24 1229522, at this time, the A channel received signal system has the frequency band provided by the pl L module channel A 242. The reference frequency output from the PLL module block B 246 is supplied from the second switch 244 and the fourth switch 238 to the third mixer 230. The third mixer 230 mixes the signal of the A channel applied by the switches 228a and 228b with the above-mentioned reference frequency to generate a new transmission band number. At this time, the transmission signal has a frequency band provided by the P L · L · module channel B 246. That is, it has a frequency different from the frequency band of the received signal. Secondly, Fig. 7 is a state diagram of the switching control in the B channel mode. In the standby mode shown in FIG. 5, the RSSL detector b 224 c detects the signal duration or range of the signal level of the input signal and outputs it to the comparator B 224d. This comparator B 224 d outputs the comparison value generated based on the comparison with the reference value to the channel switching control logic 226a. The channel exchange control logic 226a judges the received channel signal based on the above comparison value, and applies the judgment value to the microprocessor 25 to control the path of each switch. Therefore, in the standby mode, when a reception 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, the signal of the B channel is selectively applied with a High signal to the switch 228a, and the input signal of the switch 228a is selectively applied with a Low signal to the switch 228b. According to the above control, the received signal of the B channel of the second mixer 216 applied by the two-way diverter 206 is mixed with the reference frequency of 25 1229522 provided by the p channel module B 246 and switched to the intermediate frequency band. Receives a signal and outputs it. At this time, the B channel received signal has a frequency band provided by the p l L module channel B 246. The reference frequency output from the PL L · module channel A 242 is supplied to the third mixer 230 through the first switch 240 and the fourth switch 238. This third mixer 230 mixes the signals of the B channel applied by the switches 228a and 228b with the above-mentioned reference frequency to generate a new frequency band transmission signal. At this time, the transmission signal has a frequency band provided by the p L L module channel A 242. That is, a frequency having a different frequency band from the received signal. Next, FIG. 9 is a structural diagram for explaining the time delay in the relay system of the present invention by changing channels to extend the wireless LAN. FIG. 10 is a diagram of the present invention by extending channels to extend the wireless LAN. Timing diagram of the relay system. The path time delay T p d needs to satisfy at least the following values. Therefore, it must be Tpd> T c d + T on + 30n s (maximum PLD delay). In addition, the timing of controlling the switch by sensing the packet data must be performed before the packet data passes the switch. This is necessary to ensure the protection period (Guar (j Time) T bd) at least between the time when the switch is turned on. In addition, the switch T s w2 occurs earlier than τ p2 according to the time difference between the path time delay D p 3 and the transit time T cd of the RSSI detector 224 a and the comparator 224 b. Therefore, it is necessary for the channel exchange control block to only make The predetermined time T ad generates a time delay to turn the switch off after the packet data has completely passed the switch. 1229522 As above, the relay system of the present invention that extends the wireless LAN by switching channels is used in the wireless LAN Next, in the communication between the access point and the customer, different channels are used to perform relays as their characteristic points. In particular, the relay system of the present invention that extends the wireless LAN by switching channels is used to implement When a wireless LAN relay channel switcher is configured, the power of the access point channel F 1 and the customer channel F 2 can be monitored simultaneously.

Switch the IF channel signal according to its result value, and select the area to switch channels to perform channel relay changing by channel. In the above, with reference to the content of the description, it can be understood that if it is the industry, various changes and finalizations can be performed within the scope not departing from the technical idea of the present invention. Therefore, the technical scope of the present invention is not limited to the content described in the detailed description in the specification, but needs to be determined by the scope of the patent application. 1 [Schematic description] [Figure 1] (a) is an example diagram of a conventional wireless LAN service status, and (b) is an example diagram of a conventional wireless LAN service device signal transmission method. [Fig. 2] (a) is a conceptual diagram of the operation of a wireless local area network service device according to the present invention '(b) is a diagram illustrating a use example of a relay system for extending a wireless local area network by switching channels according to the present invention, (C) 27 1229522 example diagram of a signal transmission method of a relay system that extends a wireless local area network by switching channels according to the present invention. [Fig. 3] is a control structure diagram of a relay system for extending a wireless local area network by switching channels according to the present invention. [Fig. 4] is a signal flow chart of a relay system for extending a wireless local area network by switching channels according to the present invention. [Fig. 5] It is a state diagram of a relay system in a standby mode by switching channels to extend a wireless local area network according to the present invention. [Fig. 6] It is a state diagram of the relay system in the A-channel receiving mode by switching channels to extend the wireless local area network according to the present invention. [Fig. 7] It is a state diagram of the relay system in the B-channel receiving mode by switching channels to extend the wireless local area network according to the present invention. [Fig. 8] It is a flowchart of channel-by-channel conversion of a relay system for extending a wireless local area network by switching channels according to the present invention. [Fig. 9] It is a configuration diagram of time delay control of a relay system extending a wireless local area network by switching channels according to the present invention. [Figure 10] This is a timing diagram of the 1229522 relay system in the wireless local area network by switching channels according to the present invention. [Illustration of drawing number] 200 receiving antenna 202, 210, 218, 234 band-pass filter 204 low noise amplifier 206 two-way diverter 208, 216, 230 mixer 212, 220 gain amplifier 214, 222 shift filter 224 RSSI detector 226 Exchange control unit 228, 238, 240, 244 Switch 232 Power amplifier 236 Transmission antenna

242, 246 P L L Module channel A / B

Claims (1)

1229522 Patent application scope: 1. A relay system that extends the wireless local area network by changing channels, which is characterized by having: a receiving unit that receives signals from a receiving antenna; a transmitting unit that sends signals through a transmitting antenna; path separation The device separates the received signal of the receiving section into a channel for communication with the access point and a channel for communication with customers; A and B intermediate frequency signal processing devices use different regional channels to make the received signal become intermediate frequency. The A and B signals separated by the path separation device are frequency down-converted; the A and B amplifying devices amplify the input h number of the a and B intermediate frequency signal processing device with sufficient gain; frequency up-conversion A device that performs frequency up-conversion on the input signals of the A and B amplifying devices and transmits them through the transmitting section; and ^ a parent switching control device that monitors the input signals of the A and B intermediate frequency signal processing pen sets to be detected The signal of the channel whose duration and intensity is above a certain position will be selected to control the channel exchange of the path separation and the channel selection. Plus conversion region of the channel means on that frequency; and system using respective different channels (Frequency Channel) communication between the access point and the client to perform the relay. 2. The relay system for extending the wireless local area network by changing channels as described in item 1 of the scope of patent application, wherein the switching control device is provided with: 'Rssi detector, input A, B intermediate frequency signal processing device Input 30 1229522 input signal to detect the signal level; a comparator that compares the detection value of the RSSI detector with a reference level; and channel exchange control logic, based on the comparison value of the comparator, to execute the selection of the Interchange control of the intermediate frequency of the received signal and the intermediate frequency of the transmitted signal. 3. The relay system for extending the wireless local area network by changing channels as described in item 2 of the scope of the patent application, wherein the exchange control device is further provided with an automatic gain controller (AGC), which is detected according to the RSSI The detection value of the transmitter enables the output level of the transmitting antenna to maintain a constant control of the gain value of the A and B amplifiers. , 31