KR20060057431A - Apparatus and method for processing signal in base transceiver station - Google Patents

Abstract

The present invention relates to RF (Radio Frequency) signal processing in a base station, frequency division duplex (Frequency Division Duplex) and time division duplex method used for separation of RF signals transmitted and received through one antenna The present invention proposes a signal processing apparatus and method thereof in a base station which simultaneously simplifies the structure of the base station and reduces the manufacturing cost of the base station.

Base Station, Radio Frequency (RF), Time Division Duplex (TDD), Frequency Division Duplex (FDD)

Description

Signal processing apparatus and method thereof in a base station {APPARATUS AND METHOD FOR PROCESSING SIGNAL IN BASE TRANSCEIVER STATION}             

1 is a block diagram of an RF radio processing unit implemented using a TDD scheme in a conventional base station.

2 is a block diagram of an RF radio processing unit implemented using a conventional FDD scheme in a base station.

3 is a block diagram of an RF radio processing unit in a base station according to an embodiment of the present invention.

4A and 4B illustrate a flowchart corresponding to a signal processing method in a base station according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

300: TDD transceiver section 302: Transmitter

304: Receiver 310: FDD transceiver portion

312 transmitter 314 receiver

350: RF unit 352, 354: 1HPA, 1LNA                 

356, 358: 2HPA, 2LNA

360, 362: 1st sending BPF, 2nd sending BPF

364: Combiner

366, 368: second receiving BPF, first receiving BPF

370: circulator 372: isolator

374: divider 376: high frequency switch

380 control unit

The present invention relates to radio frequency (hereinafter referred to as "RF") signal processing in a base station, and more particularly, frequency division duplex (Frequency Division Duplex) used for separation of RF signals transmitted and received through one antenna; Hereinafter, the present invention relates to a signal processing apparatus capable of simultaneously processing a "FDD" scheme and a Time Division Duplex (hereinafter referred to as "TDD") scheme and a method thereof.

In general, a mobile communication system includes a mobile switching center, a base station system, and a mobile station (or mobile station).                         

The base station system includes a base station controller and a base transceiver station, which can be connected to each other by wire.

Such a base station system wirelessly communicates with a mobile station and is wired to a public switched telephone network to enable communication between the mobile station and a public switched telephone network.

The base station controller is located between the base station and the mobile communication exchange to manage the base station management.

A base station is a network termination device that is directly connected to a mobile station by performing baseband signal processing, wired and wireless conversion, and transmission and reception of wireless signals.

The base station may be divided into a baseband processing unit and an RF radio processing unit, and the baseband processing unit performs relay line matching with the base station and the base station control period, and converts a signal received from the base station controller into a baseband signal and a channel. Perform the distribution. In addition, the baseband processing unit processes modulation / demodulation, synchronization, paging, access, forwarding, and reverse traffic of each channel, and up-converts the baseband signal to an intermediate frequency signal. Up Converting) and down converting the intermediate frequency signal to the baseband signal.

Meanwhile, the RF radio processing unit may be divided into a transceiver unit and an RF unit, and the transceiver unit converts an intermediate frequency signal into an RF signal for a forward link transmit, and converts a reverse link receive. To convert the RF signal into an intermediate frequency signal.                         

On the other hand, the RF unit amplifies the RF signal provided by the transceiver unit with a constant gain and outputs it through the transmission antenna, minimizes the noise included in the RF signal received through the reception antenna, and sufficiently amplifies the RF signal to thereby obtain a signal-to-noise ratio (S). / N) is provided to the transceiver section so as not to deteriorate.

The RF unit may be configured to transmit and receive an RF signal through one antenna, and a duplexing method is used to separate the RF signal transmitted and received through one antenna.

Duplexing methods include a TDD method and an FDD method, which will be described with reference to the accompanying drawings.

1 is a block diagram of an RF radio processing unit implemented using a TDD scheme in a conventional base station.

As shown in FIG. 1, the RF radio processing unit implemented using the TDD scheme includes a transceiver unit 100, an RF unit 110, and a controller 130.

The transceiver unit 100 includes a transmitter 102 and a receiver 104, the RF unit 110 is a high power amplifier (hereinafter referred to as "HPA") 112, Circulator 114, Band Pass Filter (hereinafter referred to as "BPF") 116, Coupler (118), Low Noise Amplifier (hereinafter referred to as "LNA") 120, an isolator 122, and a high frequency switch 124 are included.

The controller 130 generates and transmits a control signal to the HPA 112, the LNA 120, and the high frequency switch 124 to timely control the transmission and reception of the RF signal through the antenna. That is, the controller 130 generates a transmission / reception control signal having a predetermined period and provides the transmission / reception control signal to the HPA 112, the LNA 120, and the high frequency switch 124, when the RF signal is transmitted through the antenna. By operating the HPA 112, the high frequency switch 124 is grounded, and the LNA 120 is not operated. On the other hand, the controller 130 controls the switching operation of the high frequency switch 124 so that the connection between the isolator 122 and the LNA 120 is made by the transmission and reception control signal when receiving the RF signal through the antenna, the RF signal In order to operate the LNA 120 to operate, and not to operate the HPA (112).

First, the case where the RF signal is transmitted is described. Transmitter 102 converts the intermediate frequency signal to be transmitted into a transmit RF signal and provides it to HPA 112. The HPA 112 amplifies a predetermined level of the transmitted RF signal provided from the transmitter 102 according to the transmission / reception control signal provided from the controller 130 and provides the HPA 112 to the BPF 116 through the circulator 114.

The BPF 116 band-limits components other than the transmitted RF signal so that only the transmitted RF signal is transmitted through the coupler 118 and the antenna.

On the other hand, the case where the RF signal is received by the transmission and reception control signal generated by the controller 130 will be described.

The RF signal received via the antenna is provided to the BPF 116 via the coupler 118. The BPF 118 band-limits components other than the received RF signal and provides only the received RF signal to the circulator 114. The circulator 114 provides the received RF signal provided by the BPF 114 to the LNA 120 via the isolator 122 and the high frequency switch 124.

The LNA 120 minimizes the noise included in the received RF signal and provides the receiver 104 with sufficient amplification of the received RF signal so as not to deteriorate the signal-to-noise ratio (S / N). Receiver 104 converts the received RF signal provided by LNA 120 into an intermediate frequency signal and provides it to a baseband processing unit (not shown).

2 is a block diagram of an RF radio processing unit implemented using a conventional FDD scheme in a base station.

As shown in FIG. 2, the RF radio processing unit implemented using the FDD scheme includes a transceiver unit 200 and an RF unit 210.

The transceiver unit 200 includes a transmitter 202 and a receiver 204, and the RF unit 210 includes an HPA 212, a duplexer 214, a coupler 216, and an LNA 218.

 The transmitter 202 converts an intermediate frequency signal to be transmitted from a baseband processing unit (not shown) into a transmit RF signal and provides it to the HPA 212. The HPA 212 amplifies a predetermined level of the transmitted RF signal and provides it to the duplexer 214. The duplexer 214 filters the transmitted RF signal according to the transmission band to be transmitted through the coupler 216 and the antenna.

On the other hand, the coupler 216 provides the RF signal received through the antenna to the duplexer 214, the duplexer 214 filters the received RF signal to the reception band and provides it to the LNA 218. The LNA 218 provides the receiver 204 with sufficient amplification of the received RF signal provided at the duplexer 214 so as not to worsen the signal-to-noise ratio (S / N). Receiver 204 converts the received RF signal provided by LNA 218 into an intermediate frequency signal and provides it to a baseband processing unit (not shown).

Up to now, since the communication in the mobile communication network is mainly based on voice calls, the up and down data is similar, the RF radio processing unit in the mobile communication system base station has been implemented using the FDD scheme. In the case of the wireless broadband technology, the RF radio processing unit has a trend of implementing the TDD scheme instead of the FDD scheme for duplexing the transmitted and received RF signals due to the large amount of downlink data.

Therefore, a mobile station using the FDD scheme and a mobile station using the TDD scheme may be mixed on the mobile communication network. That is, since the mobile station using the FDD scheme and the mobile station using the TDD scheme may be mixed in the service area of the base station, the base station should be provided with an RF radio processing unit for duplexing the RF signal by the FDD scheme and the TDD scheme. .

However, since a base station has to be provided with an RF radio processing unit for duplexing an RF signal in an FDD scheme and a TDD scheme, respectively, the structure of the base station becomes complicated, and a cost for manufacturing the base station occurs. do.

Accordingly, the present invention has been made to solve the above problems, and provides a signal processing apparatus and method for processing duplexing of FDD and TDD at the same time through one antenna in a base station There is that purpose.

Signal processing apparatus in a base station according to an aspect of the present invention for achieving the above object, the antenna for transmitting and receiving RF (Radio Frequency) signal, the first transmission signal for the time division duplex (TDD) scheme and FDD (Frequency) Combiner for channel-combining the second transmission signal for the Division Duplex (Split Duplex) scheme to the antenna, and by splitting the RF signal received through the antenna channel generated using the TDD scheme and the first received signal generated by the TDD scheme A separation unit for separating the received second received signal, the first processing unit generating the first transmission signal and providing the coupling unit, and a first processing unit processing the frequency of the first reception signal downward, and generating the second transmission signal and combining unit And a second processor configured to down-process the frequency of the second received signal.

The frequencies of the first transmission signal and the first reception signal are the same, and the frequencies of the second transmission signal and the second reception signal are different.

The first processing unit includes a control unit for generating a transmission / reception control signal having a predetermined period to control transmission of the first transmission signal and reception of the first reception signal, and according to the transmission / reception control signal, When the first reception signal is received, the first reception signal is not transmitted when the transmission is performed, and when the first reception signal is received, the first transmission signal is not transmitted.

The signal processing apparatus further includes a circulator for transmitting a signal from the coupling unit to an antenna and transmitting a signal from the antenna to the separation unit.

On the other hand, the signal processing method in the base station apparatus with an antenna according to an aspect of the present invention, generating a first transmission signal for the frequency division duplex (FDD) scheme, for the time division duplex (TDD) scheme Checking whether a second transmission signal has been generated, and when the second transmission signal is generated, channel-combining the first transmission signal and the second transmission signal to an antenna.

The channel combining and transmitting to the antenna may include restricting reception of a second received signal for a TDD scheme through an antenna when the second transmitted signal is generated, and when the second transmitted signal is not generated. Transmitting only the first transmission signal to the antenna.

The signal processing method includes channel separation of a signal received through an antenna to separate a first received signal and a second received signal for an FDD scheme, and transmitting a second transmitted signal when a second received signal is received. It further comprises the step of preventing this.                     

In the signal processing method, the frequencies of the first transmission signal and the first reception signal are different, and the frequencies of the second transmission signal and the second reception signal are the same.

Hereinafter, a signal processing apparatus and a method thereof in a base station according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

3 is a block diagram of an RF radio processing unit in a base station according to an embodiment of the present invention.

As shown in FIG. 3, the RF radio processing unit according to the present invention includes a TDD transceiver unit 300, an FDD transceiver unit 310, an RF unit 350, and a controller 380.

The TDD transceiver unit 300 includes a transmitter 302 and a receiver 304, the FDD transceiver unit 310 includes a transmitter 312 and a receiver 314, and the RF unit 350 includes an HPA 352,. 356), the first HPA 352, the first LNA 354, the second HPA 356, the second LNA 358, the first transmission BPF 360, the second transmission BPF 362, the combiner 364, The first receiving BPF 368, the second receiving BPF 366, the circulator 370, the isolator 372, the divider 374, and the high frequency switch 376 are included.

The controller 380 generates and transmits a control signal to the first HPA 352, the first LNA 354, and the high frequency switch 376 in order to control transmission and reception of the RF signal through the antenna in time. That is, the controller 380 generates a transmission / reception control signal having a predetermined period and provides it to the first HPA 352, the first LNA 354, and the high frequency switch 376, and when the RF signal is transmitted through the antenna, transmission and reception are performed. The first HPA 352 is operated by the control signal, the high frequency switch 376 is grounded, and the first LNA 354 is not operated. On the other hand, when the control unit 380 receives an RF signal through an antenna, a switching operation of the high frequency switch 376 is performed such that a connection between one output terminal of the divider 374 and the first receiving BPF 368 is made by a transmission and reception control signal. To control the first signal, and to operate the first LNA 354 to receive the RF signal, and not to operate the first HPA 354.

  The first HPA 352 operates by a transmission / reception control signal provided from the controller 380 to amplify a predetermined level of the first transmission RF signal provided from the transmitter 302 to provide the first transmission BPF 360 to the first transmission BPF 360. 360 band-limits components other than the first transmitted RF signal provided by the first HPA 352 to provide the combiner 364 with only the first transmitted RF signal.

The second HPA 356 constant level amplifies the second transmit RF signal provided by the transmitter 312 and provides it to the second transmit BPF 362, and the second transmit BPF 362 provides the second provided by the second HPA 356. Band-limiting components other than the transmission RF signal are provided to the combiner 364 for the second transmission RF signal only.

The combiner 364 combines the first transmit RF signal provided by the first transmit BPF 360 and the second transmit RF signal provided by the second transmit BPF 362 to transmit the result through the antenna through the circulator 364. Be sure to On the other hand, the combiner 364 passes through the circulator 364 only the second transmit RF signal provided by the second transmit BPF 362 when the first transmit RF signal is not provided by the first transmit BPF 360. It transmits through an antenna.                     

On the other hand, the divider 374 is an RF signal (hereinafter referred to as a "first received RF signal") received from the TDD mobile station among the RF signals received through the antenna and the RF signal received from the mobile station of the FDD method (hereinafter, &Quot; second received RF signal "

The high frequency switch 376 is switched by the transmission / reception control signal provided from the control unit 380 to provide the first reception RF signal to the first reception BPF 368, and the first reception BPF 368 is other than the first reception RF signal. Band-limiting of the component to provide only the first received RF signal to the first LNA (354).

The first LNA 354 sufficiently amplifies the first received RF signal provided by the first received BDF 368 according to the transmit / receive control signal provided by the controller 380 and does not deteriorate the signal-to-noise ratio S / N. 304). Here, the first LNA 354 is protected when the size of the first received RF signal is 13dbm and operates normally. That is, the size of the first transmitted RF signal flowing into the first LNA 354 when the first transmitted RF signal is transmitted should be reduced to 13 dBm or less. To this end, when the first HPA 352 is designed to have a gain of 47.8 dBm, the circulator 370 has a 20 dBm isolation, the isolator 372 has a 20 dBm isolation, and the high frequency switch has a 25 dBm isolation. It is desirable to design to have isolation. That is, the magnitude of the first transmission RF signal input to the first LNA 354 is -17.2 dBm (= 47.8 dBm-20 dBm-20 dBm-25 dBm), which satisfies the requirement of 13 dBm or less, so that the first LNA 354 is protected. Thus, the first received RF signal can be normally received. In addition, the first LNA 354 is protected when the amount of noise introduced is -104 dBm / 10 Mhz or less to normally perform a reception operation. That is, when the first HPA 352 does not operate, the first HPA 352 generates noise of -92dBm / 10Mhz. In this case, the noise flowing into the first LNA 354 is -112.4 dBm / 10Mhz (= -92dBm / 10Mhz (noise generated from the first HPA)-20dBm / 10Mhz (circulator)-0.4dBm / 10Mhz (high frequency switch)) Since -104 dBm / 10Mhz or less, the first LNA 354 is protected to perform the normal reception operation.

Meanwhile, the second receiving BPF 366 band-limits components other than the second receiving RF signal to provide only the second receiving RF signal to the second LNA 358, and the second LNA 358 receives the second receiving BPF 366. Amplify the second received RF signal provided by the signal and provide it to the receiver 314 without deteriorating the signal-to-noise ratio (S / N). Here, the difference between the magnitude of the second transmission RF signal and the second reception RF signal is 90dB or more, so that the second reception BPF 366 is designed to attenuate the magnitude of the second transmission RF signal by 90dB or more.

4 is a flowchart illustrating a signal processing method and a corresponding signal processing method in a base station according to an embodiment of the present invention.

Signal processing in a base station according to the present invention relates to the transmission and reception of RF signals.

4A is a flowchart illustrating a method corresponding to an RF signal transmission method in a base station according to an embodiment of the present invention.

As shown in FIG. 4A, when there is a request for transmission of the FDD transmission RF signal (S400), it is checked whether there is a request for transmission of the TDD transmission RF signal (S402).                     

When there is a transmission request of the TDD transmission RF signal, the combiner combines the FDD transmission RF signal and the TDD transmission RF signal and transmits the same through the antenna (S404). Here, when there is a request for transmission of the TDD transmission RF signal, the reception operation of the TDD reception RF signal transmitted from the TDD mobile station should not be performed.

On the other hand, the combiner transmits only the FDD transmit RF signal when there is no request to transmit the TDD transmit RF signal (S406).

4B is a flowchart illustrating a method corresponding to an RF signal receiving method in a base station according to an embodiment of the present invention.

As shown in FIG. 4B, when an RF signal is received through an antenna (410),

The divider branches the received RF signal for each channel and divides the received RF signal into an FDD received RF signal and a TDD received RF signal (S412). Components other than the FDD received RF signal included in the separated FDD received RF signal (including the FDD transmit RF signal component) are band-limited in the FDD received BPF, so only the FDD received RF signal is output, and the FDD LNA is outputted from the FDD received BPF. Low noise amplifies the output FDD received RF signal.

On the other hand, components other than the TDD received RF signal (including the TDD transmit RF signal) branched from the divider are band-limited in the TDD receive BPF so that only the TDD receive RF signal is output, and the TDD LNA is output from the TDD receive BPF Amplify the signal low noise. In this case, in order to perform the reception operation of the TDD reception RF signal, there should be no transmission of the TDD transmission RF signal through the antenna.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

As described above, according to the signal processing apparatus and the method of the base station according to the present invention, the base station to simplify the structure of the base station by simultaneously processing the duplexing (Duplexing) of the FDD scheme and TDD scheme through one antenna And there is an advantage to reduce the manufacturing cost of the base station.

Claims (8)

In the signal processing apparatus at the base station, An antenna for transmitting and receiving RF (Radio Frequency) signal, A combiner for channel combining a first transmission signal for a time division duplex (TDD) scheme and a second transmission signal for a frequency division duplex (FDD) scheme and transmitting the result to an antenna; A separation unit for channel-dividing the RF signal received through the antenna into a first received signal generated using the TDD method and a second received signal generated using the FDD method; A first processing unit generating the first transmission signal and providing the first transmission signal to a coupling unit, and processing the frequency of the first reception signal downward; And a second processing unit generating the second transmission signal and providing the second transmission signal to a coupling unit and down-processing the frequency of the second reception signal. The method of claim 1, And a frequency of the first transmitted signal and the first received signal is the same, and a frequency of the second transmitted signal and the second received signal is different. The method of claim 1, The first processing unit, A control unit for generating a transmission / reception control signal having a predetermined period to control transmission of the first transmission signal and reception of the first reception signal, According to the transmission / reception control signal, the first reception signal is not received when the first transmission signal is transmitted, and the first transmission signal is not transmitted when the first reception signal is received. Signal processing device. The method of claim 1, And a circulator for transmitting a signal from the coupling unit to the antenna and transmitting the signal from the antenna to the separation unit. In the signal processing method in a base station apparatus provided with an antenna, Generating a first transmission signal for a frequency division duplex (FDD) scheme; Checking whether a second transmission signal is generated for a time division duplex (TDD) scheme; And channel-combining the first transmission signal and the second transmission signal when the second transmission signal is generated to the antenna. The method of claim 5, The channel combining and transmitting to the antenna, Limiting reception of a second received signal for a TDD scheme through an antenna when the second transmitted signal is generated; And transmitting only the first transmission signal to the antenna when the second transmission signal is not generated. The method of claim 5, Channel-dividing the signal received through the antenna to separate the first received signal and the second received signal for the FDD scheme; And preventing the second transmission signal from being transmitted when the second reception signal is received. The method according to any one of claims 5 to 7, And a frequency of the first transmission signal and the first reception signal is different, and a frequency of the second transmission signal and the second reception signal is the same.

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