KR20100059554A - Repeater and repeating method of wireless network - Google Patents

Abstract

PURPOSE: A wireless communication repeater and a method thereof for obtaining gain greater than maximum gain of the existing repeater are provided to increase the output of the repeater due to the standard of the spectral mask. CONSTITUTION: A base station signal processing unit(230) changes a first digital signal inputted from a mobile station signal processing unit(220) into the second base station signal. The base station signal processing unit outputs the second base station signal to a second transceiver(215). The base station signal processing unit changes the second terminal local signal which it is input from the second transceiver into the second digital signal. The base station signal processing unit outputs the second digital signal to the mobile station signal processing unit.

Description

Wireless communication repeater and method {Repeater and repeating method of wireless network}

The present invention relates to a wireless communication relay device and method, and more particularly, to an apparatus and method for amplifying and transmitting a signal between a base station and a communication terminal device of a wireless communication network.

Next-generation communication systems are being developed to provide various high-speed high-capacity services for mobile terminal devices. For example, WiMAX (World Interoperability for Microwave Access) may be used. WiMAX is a technology for improving and certifying the compatibility and interoperability of broadband wireless access equipment. It is based on the IEEE 802.16d standard.

The most important factor in designing a WiMAX repeater is to meet the specifications for the spectrum mask of the RF characteristics. As a basic condition for installing a communication device in each country, a standard exists that minimizes the influence on adjacent frequency bands in the frequency spectrum, and is strictly limited to the communication law. Due to these limitations, in designing WiMAX relays, either the WiMAX Forum or the FCC presents the following spectral specifications, which must meet the spectral specifications of the repeater.

Spurious
radiation
Spurious
emission) Downlink
-14.5 dBm / RBW: 1 MHz Fc ± 4.77MHz -29 dBm / RBW: 100 KHz Fc ± 9.27MHz Downlink


-26dBc / RBW: 100KHz Fc ± 4.77MHz -33 dBc / RBW: 100 KHz Fc ± 9.27MHz -37 dBc / RBW: 100 KHz Fc ± 13.237MHz -39 dBc / RBW: 100 KHz Fc ± 17.73MHz Out of band -13dBm / RBW: 100KHz 30MHz≤f≤1GHz & 1GHz≤f≤12GHz

1 is a graph illustrating in-band noise floor and repeater gains according to Table 1 above.

Referring to FIG. 1, assuming that the output of 10 MHz / 1FA is +17 dBm and the repeater gain is 80 dB, the signal and in-band noise floor can be expressed as follows.

In-band thermal noise = -174 dBm / Hz

In-band Noise Floor (10MHz / 1FA) = -174dBm + 10log (10MHz)

= -174 dBm + 10 log (10 ⁷ ) Hz

                                = -174 dBm + 70 dBm

                                = -104 dBm

If the repeater's noise floor is 3dB, the in-band noise floor is increased to -101dBm as follows.

In-band Noise Floor (10MHz / 1FA) = -104dBm + 3dB

If the output is +17 dBm when the repeater gain is 85 dB, then the in-band noise floor is -21 dBm (in-band noise floor + gain = -10 dBm + 85 dB = -16 dBm). Therefore, the output-band noise floor = 33 dBc (+17 dBm-(-16 dBm) = 33 dBc) meets the specification (A) of FIG. In this way, the maximum gain that can meet (A) specification is 85 dB.

Thus, if the repeater gain is 86dB, the in-band noise floor is 15dBm.

In-band Noise Floor + Gain = -101dBm + 86dB

In this case, the output-band noise floor = 32 dBc (+17 dBm-(-15 dBm) = 32 dBc), which does not meet (A). Therefore, if the repeater gain is designed higher than 85dB, it is in breach of Spectrum standard which is restricted by FCC, etc., and it cannot be used as a product.

Since the repeater total gain does not exceed 85dB, if the repeater input signal is -90dBm, since the repeater output = repeater input signal + repeater total gain, the output is very weak as -90 + 85 = -5dBm, which is less effective as a repeater.

One way to improve this gain limit is to design a digital filter using a DSP that can increase the gain by approximately 95dB. In this case, due to the processing time for digital filtering, group delay of 5 ~ 8㎲, which is the system delay of the repeater, occurs, which makes it difficult to operate the system efficiently and the price of the digital filter is high. This is a major factor in rising system prices.

Although the digital filter can be used to improve the repeater system gain, it is possible to design up to 95 dB, which is about 10 dB higher than the total gain of a repeater using a conventional filter, if it is far from the WiMAX base station (RAS) radio access system or obstacles. If the signal is attenuated by a large signal or the like, the repeater cannot maintain proper characteristics.

For example, if the repeater input signal is -90dBm, when the repeater total gain using the digital filter is 95dB, the repeater output is (relay input signal + repeater total gain), so only the output of -90 + 95 = + 5dBm can be maintained. Therefore, even if the repeater maximum output is + 17dBm, if the repeater input signal is low, there is a disadvantage that the maximum output of the repeater cannot be represented.

In addition, to overcome the drawbacks of digital filters, FEMTO cells or base station chipsets for FEMTO cells have already been developed for WIBRO / WIMAX sets. In most cases, FEMTO cells are not actually implemented. This is because there is no way to link its own time division duplexing (TDD) signal with the base station equipment. That is, in order for the base station chipset to operate independently, the base station chipset needs to receive TDD signal information from the WIMAX / WIBRO base station and provide the signal information to the terminal associated with the base station chipset. The function is to use the original GPS 1pps clock or to connect the WIMAX / WIBRO base station. It should be linked with ACR (Access Control Router). However, interworking with ACR is impossible unless the base station manufacturer opens the protocol. Therefore, many equipment companies or operators can use the FEMTO cell as a small base station (FEMTO cell) that works like an AP in an individual home if the base station manufacturer opens the interworking protocol with the ACR. This FEMTO cell device is not activated because it does not open. There is an increasing demand for the development of a WiMAX relay to solve such problems.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a wireless communication relay apparatus and method capable of increasing the output of a repeater, which is limited due to a spectrum mask specification.

In order to achieve the above technical problem, a wireless communication relay device according to the present invention is located in a wireless communication network in which data is transmitted between a base station and a first communication terminal device by a first communication method, A first transmitting / receiving unit for receiving a base station signal and transmitting an input first terminal station signal to the base station; A second transmitter / receiver for receiving a second terminal station signal transmitted by the first communication terminal device and transmitting the input second base station signal to the first communication terminal device; A mobile station signal processing unit converting the first base station signal received from the first transmitting and receiving unit into a first digital signal and outputting the converted first digital signal into the first terminal station signal and outputting the converted first digital station signal to the first transmitting and receiving unit; And converting the first digital signal received from the mobile station signal processing unit into the second base station signal and outputting the converted signal to the second transmitting and receiving unit, and converting the second terminal station signal received from the second transmitting and receiving unit into the second digital signal. And a base station signal processing unit for converting and outputting the signal to the mobile station signal processing unit, wherein the base station signal processing unit is based on synchronization information which is time information of an uplink section and a downlink section received and held by the mobile station signal processing unit from the base station. The time point at which the second base station signal and the second terminal station signal are transmitted and received coincides with the time point at which the first base station signal and the first terminal station signal are transmitted and received by the mobile station signal processor.

In order to achieve the above technical problem, a wireless communication relay method according to the present invention is located in a wireless communication network in which data is transmitted between a base station and a first communication terminal device by a first communication method, and includes a mobile station signal processor and a base station. And a base station signal processing unit based on synchronization information which is time information of an uplink section and a downlink section received and held by the mobile station signal processing section. A second base station signal and a first base station signal transmitted from the base station to the mobile station signal processor and a first terminal station signal transmitted from the mobile station signal processor to the base station; 1 Synchronize so as to coincide with the timing of transmission and reception of the second terminal station signal received from the communication terminal device. The step of view; (b) the mobile station signal processing unit converting the first base station signal into a first digital signal and outputting the first base station signal to the base station signal processing unit; (c) converting, by the base station signal processing unit, the first digital signal into the second base station signal and outputting the second base station signal; (d) transmitting the second base station signal to the first communication terminal device; (e) converting, by the base station signal processor, the second terminal station signal received from the first communication terminal device into a second digital signal and outputting the second digital signal to the mobile station signal processor; (f) converting and outputting the second digital signal into the first terminal station signal by the mobile station signal processing unit; And (g) transmitting the first terminal station signal to the base station.

According to the present invention, the base station signal processing unit originally provided inside the base station is electrically connected to the mobile station signal processing unit to be provided in the repeater, so that the gain greater than the maximum gain of the existing repeater even when the size of the signal input to the repeater is small. Can be obtained. In addition, the synchronization problem can be solved by matching the transmission and reception times of the base station signal processing unit with the mobile station signal processing unit.

Hereinafter, exemplary embodiments of a wireless communication relay apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing an example of the configuration of a preferred embodiment of a wireless communication relay apparatus according to the present invention.

Referring to FIG. 2, the relay apparatus 200 according to the present invention includes a first transmitter / receiver 210, a second transmitter / receiver 215, a mobile station signal processor 220, a base station signal processor 230, and a synchronizer 240. ), A signal converter 250 and a third transmitter / receiver 260.

The relay device 200 according to the present invention is applied to a wireless communication network in which data is transmitted from a base station to a first communication terminal device by a first communication method. The first transmitting / receiving unit 210 receives a base station signal transmitted by the base station (hereinafter referred to as a 'first base station signal'), and the terminal station signal received by the relay device 200 from the first communication terminal device and transmitted to the base station. (Hereinafter referred to as 'first terminal station signal') is transmitted to the base station. The second transmitter / receiver 215 receives a terminal station signal (hereinafter referred to as a “second terminal station signal”) transmitted by the first communication terminal device, and receives a base station signal (hereinafter, referred to as “second”) from the base station signal processor 230. 2 base station signal) to the first communication terminal device.

The mobile station signal processor 220 converts the first base station signal input from the first transmitter / receiver 210 into a digital signal (hereinafter, referred to as a “first digital signal”) to convert the base station signal connected to the second transmitter / receiver 215. It outputs to the processor 230, converts the digital signal (hereinafter referred to as the "second digital signal") input from the base station signal processor 230 to the first terminal station signal and outputs it to the first transmitter and receiver 210. In addition, the base station signal processor 230 converts the first digital signal input from the mobile station signal processor 220 into a second base station signal and outputs it to the second transmitter / receiver 215, and is input from the second transmitter / receiver 215. The second terminal station signal is converted into a second digital signal and output to the mobile station signal processing unit 220. The signal conversion in the mobile station signal processor 220 and the base station signal processor 230 includes a process of converting a frequency of a signal, demodulating the signal, and then modulating the signal again. It also includes processing to pass. In this case, the first communication method may be specified as WiMAX, but the present invention is not limited thereto and may be applied to another wireless communication method such as WiFi and WLAN. Meanwhile, as the mobile station signal processor 220 and the base station signal processor 230, a commercially available mobile station chipset (Base Chipset) and a base station chipset (WiMAX) may be used. The inside of the mobile station chipset and base station chipset includes a signal demodulation device and a converter for converting an analog signal into a digital signal or a digital signal into an analog signal.

Usually, the relay device connecting the base station and the terminal station simply performs a function of amplifying and outputting the received base station signal. In this case, the terminal station chipset is provided in the terminal station, and the base station chipset is generally provided in the base station. However, the wireless communication relay 200 according to the present invention is provided with both a mobile station chipset (ie, the mobile station signal processor 220) and a base station chipset (ie, the base station signal processor 230) to perform complementary functions. The digital output terminal of the mobile station chipset and the digital input terminal of the base station chipset, and the digital input terminal of the mobile station chipset and the digital output terminal of the base station chipset are electrically connected to each other. Can solve the problem of gain limitation.

However, when the two devices provided in separate devices, that is, the mobile station signal processor 220 and the base station signal processor 230 are connected, some problems may occur. One of them is the problem of synchronization. In order to use the base station chipset, i.e., the base station signal processing unit 230, originally provided in the base station, in the relay device, the TDD signal information indicating the uplink time for transmitting and receiving the base station signal and the downlink time for transmitting and receiving the terminal station signal are provided. This is not easy to solve because of the above problems.

Since the mobile station signal processor 220 interworking with the base station is originally provided in the mobile terminal device, the mobile station signal processing unit 220 receives TDD signal information from the base station to accurately distinguish the uplink time and the downlink time to communicate with the base station. As such, since the mobile station signal processor 220 has TDD signal information, when the mobile station signal processor 220 provides the time information of the mobile station signal processor 220 to the base station signal processor 230, signal transmission and reception can be performed at the same time. To this end, the base station signal processor 230 matches the transmission and reception times of the second base station signal and the second terminal station signal with the downlink and uplink switching points of the mobile station signal processor 220, respectively. That is, the base station signal processor 230 transmits the second base station signal obtained by converting the first digital signal input from the mobile station signal processor 220 to the downlink period determined based on the TDD signal information provided from the mobile station signal processor 220. And provides the TDD signal information to the first communication terminal device so that the first communication terminal device can transmit the second terminal station signal in the uplink section determined based on the TDD signal information provided from the mobile station signal processing unit 220. Therefore, the uplink and downlink times of the base station signal processor 230 are matched with the mobile station signal processor 220, thereby enabling transmission and reception of signals based on the same TDD signal.

Accordingly, the synchronization of the uplink and downlink times is matched between the (base station ↔ mobile station signal processing unit 220) and the (base station signal processing unit 230 ↔ first communication terminal device) to enable normal transmission and reception. The first transmitter / receiver 210 receives the first base station signal transmitted from the base station to the mobile station signal processor 220 during the uplink time based on the TDD signal received from the base station. The first terminal station signal output from 220 is transmitted to the base station. To this end, the first transmitter / receiver 210 may include a switch to control a signal transmission path according to uplink and downlink times.

In order to match the transmission / reception time of the mobile station signal processing unit 220 with the transmission / reception time of the base station signal processing unit 230, the wireless communication relay device 200 according to the present invention may include a synchronization unit 240. The synchronization unit 240 is based on the synchronization information obtained from the mobile station signal processing unit 220, that is, time information of the uplink section and the downlink section of the base station signal processing unit 230 and the first communication terminal device based on the time information of the TDD signal. It generates a synchronization signal indicating to provide to the base station signal processor 230.

 These synchronization signals are represented by high (1) and low (0) values according to the uplink and downlink times in the mobile station signal processing unit 220, respectively, and the base station signal processing unit 230 is a synchronization unit through the TDD signal input terminal. Based on the TDD clock signal provided from 240, synchronization of the uplink and downlink intervals may be synchronized with the base station. However, if the synchronization unit 240 generates and provides a TDD clock signal as a synchronization signal, the change of the mobile station chipset and the base station chipset can be minimized. However, the synchronization unit 240 must be designed separately so that the economic and relay devices ( In terms of the structural aspect of the 200).

Therefore, in order to solve this problem, the mobile station signal processing unit 220 may generate the above synchronization signal by itself and provide it to the base station signal processing unit 230. The synchronizing signal generating method is the same as the synchronizing signal generating method in the synchronizing unit 240. When the synchronizing signal is generated in the mobile station signal processing unit 220, there is no need to implement a separate device such as the synchronizing unit 240. to be. In this way, even when the mobile station signal processing unit 220 generates the synchronization signal, the generated synchronization signal is provided through the TDD signal input terminal of the base station signal processing unit 230.

As another embodiment for providing the synchronization signal to the base station signal processing unit 230, the time information of the synchronization signal to the first digital signal output from the mobile station signal processing unit 220 to the base station signal processing unit 230, that is, provided by the base station Information on the uplink section and the downlink section may be included and provided through the digital input terminal of the base station signal processor 230. In this case, the base station signal processor 230 receiving the first digital signal synchronizes the uplink section with the downlink section in relation to the first communication terminal device based on the TDD time information included in the first digital signal. It can match with the base station. To this end, a separate protocol for obtaining time information must be defined between the mobile station signal processor 220 and the base station signal processor 230, which is implemented in software in the mobile station signal processor 220 and the base station signal processor 230. Can be.

When the first base station signal received by the base station is transferred to the base station signal processing unit 230 as the first digital signal through the mobile station signal processing unit 220 by the above process, the base station signal processing unit 230 stores the first digital signal. 2 base station signals are converted and output to the second transmitter / receiver 215. In addition, the base station signal processor 230 converts the second terminal station signal input from the second transmitter / receiver 215 into a second digital signal and outputs the signal to the mobile station signal processor 220. As mentioned above, the digital output terminal of the mobile station signal processor 220, the digital input terminal of the base station signal processor 230, the digital input terminal of the mobile station signal processor 220 and the digital output terminal of the base station signal processor 230 are electrically connected. Since it is connected to, the signal converted into a digital signal is transferred between the mobile station signal processor 220 and the base station signal processor 230. Therefore, processing such as frequency conversion of the signal is not necessary.

The second transmitter / receiver 215 transmits the second base station signal received from the base station signal processor 230 to the first communication terminal device using the first communication method. In this case, when the first communication method is WiMAX, a WiMAX terminal device is used as a corresponding communication terminal device. When using a communication method other than WiMAX, terminal devices corresponding thereto may be used as the first communication terminal device.

The second transmitter / receiver 215 may exchange base station signals and terminal stations with not only the first communication terminal device using the first communication method but also a second communication terminal device using a second communication method different from the first communication method. Can be. To this end, the relay device 200 according to the present invention may further include a signal converter 250 and a third transmitter / receiver 260.

The signal converter 250 converts the signal of the first communication method output from the base station signal processor 230 into a third base station signal of the second communication method. In addition, the third transmitter / receiver 260 transmits the third base station signal of the second communication method output from the signal converter 250 to the second communication terminal device. In this case, the second communication method used may include Ethernet, Wi-Fi, and voice packet network, but the present invention is not limited thereto. The second communication terminal device corresponding to the second communication method corresponds to all devices that can be connected using respective methods such as a desktop PC and a PDA. The third terminal station signal of the second communication method transmitted from the second communication terminal device is input to the third transmitter / receiver 260, and is converted into a signal of the first communication method by the signal converter 250 to convert the signal to the base station signal processor ( 230).

3 illustrates an example of transmitting a WiMAX signal as an example of a signal of a first communication method by connecting to a first communication terminal device and a second communication terminal device through a wireless communication relay device 200 according to the present invention. .

Referring to FIG. 3, the WiMAX signal transmitted from the base station 310 installed outside is input to the relay device 200 according to the present invention through the link antenna 320 installed outside the building. The WiMAX signal transmitted to the base station signal processor 230 through the process as described above is the first communication terminal device corresponding to the WiMAX signal, that is, the WiMAX terminal, through the service antenna 330 connected to the second transmitter / receiver 215. Is sent to the device. In addition, the WiMAX signal is converted into a signal of a second communication method such as Wi-Fi, voice packet network and Ethernet by the signal converter 250 and transmitted to the second communication terminal device.

4 shows an example of a wireless communication relay 200 according to the present invention implemented to use WiMAX as a first communication method.

Referring to FIG. 4, a process of transmitting and receiving a base station signal is received from a base station 310 and received through a link antenna 320. The first base station signal is input to a mobile station signal processor 220 through a transceiver (XCVR). The first base station signal is converted into a first digital signal by the mobile station signal processing unit 220 and then input to the base station signal processing unit 230, and the first digital signal is converted into a second base station signal by the base station signal processing unit 230. After the transmission to the first communication terminal device via the service antenna 330 connected to the second transceiver 215 via the transceiver (XCVR) and amplifier (PA), or the second communication by the signal conversion unit 250 After converting into a third base station signal of the scheme, it is transmitted to a second communication terminal device by a Wi-Fi, Ethernet, etc. which can be used as a second communication scheme through a router connected to the third transmitter / receiver 260.

In addition, referring to the process of transmitting and receiving a terminal station signal, the second terminal station signal of the first communication method received through the service antenna 330 connected to the second transmitter / receiver 215 passes through a transceiver (XCVR) to the base station signal processor 230. The second terminal station signal of the second communication method inputted through the third transmission / reception unit 260 by Wi-Fi, Ethernet, etc., is input by the signal conversion unit 250 via the router and the third transmission / reception unit 260. The signal is converted into a communication type signal and then input to the base station signal processor 230. Next, the second terminal station signal is converted into a second digital signal by the base station signal processing unit 230 and then input to the mobile station signal processing unit 220, and the second digital signal is input by the mobile station signal processing unit 220 to the first terminal station signal. After the conversion to the transmission through the transceiver (XCVR) and amplifier (PA) via the link antenna 320 to the base station 310. The SDRAM connected to the mobile station signal processor 220 and the base station signal processor 230 temporarily stores data included in the received signal. The MEM connected to the router also stores data, and the Status LED indicates the status of the device currently connected to the third transmitter / receiver 260.

By using the relay apparatus 200 in which the mobile station signal processing unit 220 and the base station signal processing unit 230 are electrically connected in this way, the aforementioned gain limitation problem can be solved. In general, the reception sensitivity of the signal received from the WiMAX base station depends on the commercial performance of the mobile station signal processing unit 220 (provided by the manufacturer). The stable reception sensitivity is about -90 dBm, but the actual data provided can be up to -97 dBm. Therefore, if the output of the repeater 200 according to the present invention is designed to + 20dBm, the maximum gain of the relay function is 110dB ~ 117dB relay gain effect to see the 25 ~ 32dB or more gain effect than the maximum gain of the existing repeater design cost Has two effects, which are very inexpensive.

Next, with respect to the frequency of the transmitted signal, the link antenna 320 for receiving the first base station signal and transmitting the first terminal station signal, and the service antenna 330 for transmitting the second base station signal and receiving the second terminal station signal. There is a way to make the transmit / receive frequency of the same or different. This is a problem with respect to the installation location of the link antenna 320 and the service antenna 330 and the frequency of the transmitted base station signal and the terminal station signal.

In general, the base station 310 is operated with a maximum of 3FA (3-Channel), that is, three frequency bands per sector, and the wireless communication relay 200 according to the present invention communicates with one FA (Channel) signal among them. Will be When the transmission and reception frequencies of the link antenna 320 and the service antenna 330 are the same, the FA (Channel) of the link antenna 320 is the first FA, and the FA (Channel) of the service antenna 330 is also the first FA. In case of operating as (Channel). In this case, since the reception frequency and the transmission frequency are the same, transmission and reception interference occurs when the relay apparatus 200 is operated, so that stable service is possible only when the link antenna 320 and the service antenna 330 are sufficiently isolated. Do. Therefore, when the link antenna 320 is installed and operated outside the building so as to be completely spaced apart from the service antenna 330, the terminal station signal transmitted from the terminal device flows into the link antenna 320 or the terminal device through the service antenna 330. The base station signal transmitted to the link antenna 320 may be blocked.

If the transmission and reception frequencies of the link antenna 320 and the service antenna 330 are different from each other, it is assumed that the relay 200 communicates with the first FA through a signal transmitted from the base station 301. The FA (Channel) of the 330 is changed into a second FA or a third FA to communicate with the terminal device. Therefore, even if the second terminal station signal transmitted from the terminal device or the second base station signal output from the service antenna 330 flows into the link antenna 320, the interoperation frequency is different, so that no signal interference occurs. Therefore, in this case, it is not necessary to install the link antenna 320 on the outside of the building, even if it is installed in the position close to the service antenna 330 on the relay device 200 can stably perform the role of the relay device 200. have. Table 2 below shows the difference between when the base station signal and the terminal station signal have the same frequency and different from each other.

Link frequency = service frequency Link frequency ≠ service frequency Cannot install two antennas in the same place Two antennas can be installed in the same place External directional antenna Internal omnidirectional antenna High price of link antenna Antenna is cheaper Cable installation between antenna and CPE is required No cable installation required CPE installation cost and installation manpower required Easy installation by customer Location restrictions There is relatively no limit of installation place

Referring to Table 2, it can be seen that it is preferable to design the transmission and reception frequency of the link antenna 320 and the transmission and reception frequency of the service antenna 330 different from each other. That is, the relay apparatus 200 according to the present invention allows the first base station signal and the first terminal station signal transmitted and received through the link antenna 320 to be transmitted and received through a first frequency band among a plurality of frequency bands, and the service antenna 330 The second base station signal and the second terminal station signal transmitted and received through the () may be transmitted and received through a second frequency band different from the first frequency band.

5 is a flowchart illustrating a signal transmission process from the base station 310 to the first communication terminal device or the second communication terminal device in the preferred embodiment of the wireless communication relay method according to the present invention.

Referring to FIG. 5, the first base station signal transmitted from the base station 310 and received through the link antenna 320 is input to the mobile station signal processor 220 (S510). Next, the mobile station signal processing unit 220 converts the input first base station signal into a first digital signal and outputs the first digital signal (S520). The base station signal processor 230 converts the received first digital signal into a second base station signal and outputs the converted signal. At this time, the base station signal processor 230 transmits and receives a time point for transmitting and receiving the second base station signal and the second terminal station signal based on the synchronization information which is the time information of the uplink and downlink sections that the mobile station signal processor 220 receives from the base station. In step S530, the mobile station signal processing unit 220 matches the first base station signal and the first terminal station signal. Therefore, the second base station signal is output at the same time as the downlink section in the mobile station signal processor 220 (S540). The synchronization process as described above may be performed by providing the synchronization signal generated by the synchronization unit 240 separately provided to the base station signal processing unit 230, and the mobile station signal processing unit 220 generates the synchronization signal itself. It may be provided to the base station signal processor 230. Alternatively, the first digital signal output from the mobile station signal processor 220 includes the synchronization information and outputs the signal to the base station signal processor 230, and the base station signal processor 230 acquires the synchronization information from the first digital signal to perform the first communication. It can be provided to the terminal device.

If the first base station signal is a signal directed to the first communication terminal device for transmitting and receiving information by the first communication method (S550), the second base station signal is directly transmitted through the second transmitting and receiving unit 215 without a separate signal conversion process. 1 is transmitted to the communication terminal device (S560). On the contrary, if the first base station signal is a signal directed to the second communication terminal device for transmitting and receiving information by the second communication method (S550), the signal converter 250 converts the signal of the first communication method to the second communication method. Convert to three base station signals (S570). Finally, the third base station signal converted into a signal of the second communication method is transmitted to the second communication terminal device through the third transmitting and receiving unit 260 (S580). In this case, when the first communication method is WiMAX, a WiMAX terminal device corresponding thereto is used as the first communication terminal device.

6 is a flowchart illustrating a signal transmission process from the first communication terminal device or the second communication terminal device to the base station 310 in the preferred embodiment of the wireless communication relay method according to the present invention.

Referring to FIG. 6, a second terminal station signal transmitted from a first communication terminal device, for example, a WiMAX terminal device, is input to a base station signal processor 230 through a service antenna 330 and a second transmitter / receiver 215. The third terminal station signal transmitted from the second communication terminal device is received through the third transmitter / receiver 260 and converted into a signal of the first communication method by the signal converter 250, and then the base station signal processor 230. It is input to (S610). Next, the base station signal processor 230 converts the second terminal station signal into a second digital signal and outputs the signal to the mobile station signal processor 220 (S620). At this time, as described above, the transmission time point of the first base station signal and the first terminal station signal in the mobile station signal processing unit 220 coincides with the transmission time point of the second base station signal and the second terminal station signal in the base station signal processing unit 230, The base station signal processor 230 outputs the second digital signal at the same time as the uplink interval in the mobile station signal processor 220.

The mobile station signal processing unit 220 converts the second digital signal input from the base station signal processing unit 230 into a first terminal station signal and outputs it (S630). Finally, the first terminal station signal is transmitted to the base station 310 through the first transmitting and receiving unit 210 and the link antenna 320 (S640).

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

1 is a graph illustrating in-band noise floor and repeater gain,

2 is a block diagram showing an example of a configuration of a preferred embodiment of a wireless communication relay device according to the present invention;

3 is a diagram illustrating an example of transmitting a WiMAX signal by connecting to a first communication terminal device and a second communication terminal device through a wireless communication relay device according to the present invention;

4 is a view showing an example of a wireless communication relay device according to the present invention implemented to use WiMAX as a first communication method,

5 is a flowchart illustrating a signal transmission process from a base station to a first communication terminal device or a second communication terminal device in a preferred embodiment of the wireless communication relay method according to the present invention;

6 is a flowchart illustrating a signal transmission process from a first communication terminal device or a second communication terminal device to a base station in a preferred embodiment of a relay method of a wireless communication network according to the present invention.

Claims (18)

In a wireless communication relay device located in a wireless communication network in which data is transmitted between a base station and a first communication terminal device by a first communication method, A first transmitting and receiving unit for receiving a first base station signal transmitted by the base station and transmitting the input first terminal station signal to the base station; A second transmitter / receiver for receiving a second terminal station signal transmitted by the first communication terminal device and transmitting the input second base station signal to the first communication terminal device; A mobile station signal processing unit converting the first base station signal received from the first transmitting and receiving unit into a first digital signal and outputting the converted first digital signal into the first terminal station signal and outputting the converted first digital station signal to the first transmitting and receiving unit; And Converts the first digital signal received from the mobile station signal processor into the second base station signal and outputs the signal to the second transmitter / receiver; and converts the second terminal station signal received from the second transmitter / receiver into the second digital signal. And a base station signal processor for outputting the signal to the mobile station signal processor; The base station signal processor is configured to transmit and receive a time point at which the second base station signal and the second terminal station signal are transmitted / received based on synchronization information which is time information of the uplink and downlink sections received and held by the mobile station signal processor. And the first base station signal and the first terminal station signal at the mobile station signal processor coincide with a transmission and reception point of time. The method of claim 1, A synchronization unit for generating a synchronization signal representing time information of uplink and downlink sections of the base station signal processing unit and the first communication terminal device based on the synchronization information obtained from the mobile station signal processing unit, and providing the synchronization signal to the base station signal processing unit; Wireless communication repeater further comprises. The method of claim 1, The mobile station signal processing unit generates a synchronization signal representing time information of the uplink and downlink sections of the base station signal processing unit and the first communication terminal device based on the synchronization information provided from the base station, and provides the synchronization signal to the base station signal processing unit. Wireless communication relay device, characterized in that. The method of claim 2 or 3, And the base station signal processing unit provides the first communication terminal device with synchronization information indicating time information of an uplink section and a downlink section based on the synchronization signal. The method of claim 1, The mobile station signal processor includes the synchronization information provided from the base station in the first digital signal and outputs the signal to the base station signal processor. And the base station signal processing unit provides time information of an uplink section and a downlink section to the first communication terminal device based on the synchronization information included in the first digital signal. The method according to any one of claims 1 to 3, The digital output terminal of the mobile station signal processing unit and the digital input terminal of the base station signal processing unit are electrically connected, and the digital input terminal of the mobile station signal processing unit and the digital output terminal of the base station signal processing unit are electrically connected. Repeater. The method according to any one of claims 1 to 3, The first base station signal and the first terminal station signal are transmitted through a first frequency band among a plurality of frequency bands used in the first communication scheme, and the second base station signal and the second terminal station signal are the first frequency. A wireless communication relay device, characterized in that being transmitted through a second frequency band different from the band. The method according to any one of claims 1 to 3, Converting the signal of the first communication method inputted from the base station signal processor into a third base station signal which is a signal of a second communication method different from the first communication method, and transmitting and receiving a signal by the second communication method. A signal converter for converting a third terminal station signal received from the two communication terminal apparatuses into a signal of the first communication method and outputting the signal to the base station signal processor; And A third transmitting and receiving unit which transmits the third base station signal input from the signal converting unit to the second communication terminal device and outputs a third terminal station signal transmitted from the second communication terminal device to the signal converting unit. Wireless communication relay device comprising a. The method according to any one of claims 1 to 3, The first communication method is a wireless communication relay device, characterized in that the WiMAX. In a wireless communication relay method by a wireless communication relay device located in a wireless communication network in which data is transmitted between a base station and a first communication terminal device by a first communication method, the mobile communication device comprising a mobile station signal processing unit and a base station signal processing unit. (a) wherein the base station signal processing unit is received from the base station and inputted to the mobile station signal processing unit on the basis of synchronization information which is time information of the uplink section and the downlink section received and held by the mobile station signal processing unit; A transmission time point of the first base station signal and the first terminal station signal transmitted from the mobile station signal processing unit to the base station, of the second base station signal transmitted to the first communication terminal device and the second terminal station signal received from the first communication terminal device; Securing synchronization to coincide with the time of transmission and reception; (b) the mobile station signal processing unit converting the first base station signal into a first digital signal and outputting the first base station signal to the base station signal processing unit; (c) converting, by the base station signal processing unit, the first digital signal into the second base station signal and outputting the second base station signal; (d) transmitting the second base station signal to the first communication terminal device; (e) converting, by the base station signal processor, the second terminal station signal received from the first communication terminal device into a second digital signal and outputting the second digital signal to the mobile station signal processor; (f) converting and outputting the second digital signal into the first terminal station signal by the mobile station signal processing unit; And (g) transmitting the first terminal station signal to the base station. The method of claim 10, Generating a synchronization signal indicating time information of the uplink section and the downlink section of the base station signal processing unit and the first communication terminal device based on the synchronization information obtained from the mobile station signal processing unit and providing the same to the base station signal processing unit; Wireless communication relay method further comprising. The method of claim 10, In step (a), the mobile station signal processing unit generates a synchronization signal indicating time information between the base station signal processing unit and the first communication terminal device based on the synchronization information provided from the base station. And generating and providing the signal to the base station signal processor. The method of claim 11 or 12, In step (a), And providing, by the base station signal processor, time information of an uplink section and a downlink section to the first communication terminal device. The method of claim 10, In step (a), (a1) the mobile station signal processor including the synchronization information provided from the base station in the first digital signal and outputting the same to the base station signal processor; And (a2) providing, by the base station signal processor, time information of an uplink section and a downlink section to the first communication terminal device based on the synchronization information included in the first digital signal; Wireless communication relay method. The method according to any one of claims 10 to 12, The digital output terminal of the mobile station signal processing unit and the digital input terminal of the base station signal processing unit are electrically connected, and the digital input terminal of the mobile station signal processing unit and the digital output terminal of the base station signal processing unit are electrically connected. Relay method. The method according to any one of claims 10 to 12, The first base station signal and the first terminal station signal are transmitted through a first frequency band among a plurality of frequency bands used in the first communication scheme, and the second base station signal and the second terminal station signal are the first frequency. The wireless communication relay method, characterized in that transmitted through a second frequency band different from the band. The method according to any one of claims 10 to 12, (h) converting the signal of the first communication method inputted from the base station signal processor into a third base station signal which is a signal of a second communication method different from the first communication method, and transmitting and receiving a signal by the second communication method; Transmitting to a second communication terminal device; And and (i) converting a third terminal station signal transmitted from the second communication terminal device into a signal of the first communication method and outputting the signal to the base station signal processing unit. The method according to any one of claims 10 to 12, The first communication method is a wireless communication relay method, characterized in that WiMAX.

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