CN108123725B - Tower amplifier and method for signal transmission in tower amplifier - Google Patents

Tower amplifier and method for signal transmission in tower amplifier Download PDF

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Publication number
CN108123725B
CN108123725B CN201611070169.XA CN201611070169A CN108123725B CN 108123725 B CN108123725 B CN 108123725B CN 201611070169 A CN201611070169 A CN 201611070169A CN 108123725 B CN108123725 B CN 108123725B
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radio frequency
lna
control circuit
switch group
switches
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CN108123725A (en
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龚兰平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Amplifiers (AREA)
  • Transceivers (AREA)

Abstract

The application discloses a tower mounted amplifier TMA and a method for signal transmission in the TMA, the TMA comprises a control circuit, an amplifying circuit, a first radio frequency switch group connected with a first end of the amplifying circuit and a second radio frequency switch group connected with a second end of the amplifying circuit, the amplifying circuit comprises at least one LNA, the control circuit is used for carrying out current detection on the first end and the second end and controlling switches in the first radio frequency switch group and the second radio frequency switch group to carry out state switching according to a detection result, so that an output end of a target LNA in the at least one LNA is connected with one end of the first end and the second end, which detects no current or detects current later, and an input end of the target LNA is connected with one end of the first end and the second end, which detects no current or detects current later. The LNA in the amplifying circuit is controlled to be adaptive to the current scene by adjusting the switch states at two ends of the amplifying circuit, so that the amplifying circuit can be applied to various scenes.

Description

Tower amplifier and method for signal transmission in tower amplifier
Technical Field
The present application relates to the field of wireless communications, and more particularly, to a tower mounted amplifier and a method of transmitting signals in the tower mounted amplifier.
Background
With the continuous evolution of wireless communication technology, particularly after intelligent terminals come into the market, indexes of data service demands of people are continuously increased, mobile users are rapidly increased, high-rise buildings are more and more, and telephone traffic density and coverage requirements are continuously increased, so that the frequency range number of each operator is continuously increased, and the maximum frequency range number of the operator can reach 9 frequencies in 2020. Due to the increase of frequency bands, the load of a Tower station becomes a problem, most operators can only accept one sector, one to two antennas and a small number of Remote Radio Units (RRUs) to go up a Tower, and in the process of amplifying uplink signals by using a Tower top Amplifier (Tower Mounted Amplifier, TMA for short), if the Tower top Amplifier is used in multiple application scenes, multiple TMA devices are needed to adapt to different scene requirements.
Disclosure of Invention
The embodiment of the invention provides a tower top amplifier and a signal transmission method in the tower top amplifier, which can be simultaneously applied to various scenes through one tower top amplifier.
In a first aspect, a tower mounted amplifier, TMA, is provided, the TMA comprising a control circuit, an amplification circuit, a first set of radio frequency switches connected to a first terminal of the amplification circuit, and a second set of radio frequency switches connected to a second terminal of the amplification circuit, the amplification circuit comprising at least one low noise amplifier, LNA,
the control circuit is configured to perform current detection on the first terminal and the second terminal, and control switches in the first radio frequency switch group and the second radio frequency switch group to perform state switching according to a result of the current detection, so that an output terminal of a target LNA in the at least one LNA is connected to one of the first terminal and the second terminal, where a current is detected first, and an input terminal of the target LNA is connected to one of the first terminal and the second terminal, where a current is not detected or is detected later;
the first radio frequency switch group and the second radio frequency switch group are used for switching the states according to the control of the control circuit;
and the target LNA is used for amplifying the uplink signal passing through the target LNA under the control of the control circuit.
Therefore, when the TMA is used in different application scenes, the LNA in the amplifying circuit is controlled to adapt to the current scene by adjusting the states of the switches in the radio frequency switch groups at the two ends of the amplifying circuit, so that the TMA can amplify signals in any application scene in the scene.
The embodiment of the invention realizes that the method can be suitable for the same TMA in multiple application scenes. Because this TMA can intelligent judgement be signal flow to and control corresponding LNA and realize signal amplification, reduced the complexity of wiring, reduced the mistake that the wiring brought on the tower.
Optionally, in an implementation manner of the first aspect, the amplifying circuit includes two LNAs, the first radio frequency switch group includes one single-pole multi-throw switch, and the second radio frequency switch group includes one single-pole multi-throw switch.
Optionally, in an implementation manner of the first aspect, the amplifying circuit includes one LNA, the first radio frequency switch group includes two single-pole multi-throw switches, and the second radio frequency switch group includes two single-pole multi-throw switches.
In a second aspect, there is provided a tower mounted amplifier TMA, comprising a first port, N second ports, and N channels connected between the first port and the N second ports, a filter being provided on each of the N channels for filtering a signal on each channel,
the N channels are used for splitting a first signal input from the first port so that the split first signal is output from the N second ports, and/or
And combining second signals input from the N second ports so that the combined second signals are output from the first port, wherein N is a positive integer greater than 1.
Therefore, in this embodiment, the TMA includes a plurality of radio frequency channels, and can combine and split signals.
Optionally, in an implementation manner of the second aspect, the TMA further includes a control circuit as in the first aspect and any implementation manner, and at least one of the N channels is further connected with an amplifying circuit, a first radio frequency switch set, and a second radio frequency switch set as in the first aspect and any implementation manner.
In a third aspect, a method for signal transmission in a tower mounted amplifier, TMA, comprising a control circuit, an amplification circuit, a first set of radio frequency switches connected to a first terminal of the amplification circuit, and a second set of radio frequency switches connected to a second terminal of the amplification circuit, the amplification circuit comprising at least one low noise amplifier, LNA, is provided, the method comprising:
the control circuit detects current on the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in the at least one LNA is connected with one end of the first end and the second end, which detects current first, and the input end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later;
the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit;
and the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
Optionally, in an implementation manner of the third aspect, the amplifying circuit comprises two LNAs, the first radio frequency switch group comprises one single-pole multi-throw switch, the second radio frequency switch group comprises one single-pole multi-throw switch,
the control circuit detects currents at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit includes:
the control circuit detects current on the first end and the second end and controls a single-pole multi-throw switch in the first radio frequency switch group and a single-pole multi-throw switch in the second radio frequency switch group to switch states according to the detection result;
the state switching of the first radio frequency switch group and the second radio frequency switch group is carried out according to the control of the control circuit, and the state switching comprises the following steps: the single-pole multi-throw switch in the first radio frequency group performs state switching according to the control of the control circuit; the single-pole multi-throw switch in the second radio frequency group carries out the state switching according to the control of the control circuit.
Optionally, in an implementation manner of the third aspect, the amplifying circuit comprises one LNA, the first radio frequency switch group comprises two single-pole multi-throw switches, the second radio frequency switch group comprises two single-pole multi-throw switches,
the control circuit detects currents at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit includes:
the control circuit detects current on the first end and the second end and controls a single-pole multi-throw switch in the first radio frequency switch group and a single-pole multi-throw switch in the second radio frequency switch group to switch states according to the detection result;
the state switching of the first radio frequency switch group and the second radio frequency switch group is carried out according to the control of the control circuit, and the state switching comprises the following steps: the single-pole multi-throw switch in the first radio frequency group performs state switching according to the control of the control circuit; the single-pole multi-throw switch in the second radio frequency group carries out the state switching according to the control of the control circuit.
In a fourth aspect, a method for signal transmission in a tower mounted amplifier TMA is provided, where the TMA includes a first port, N second ports, and N channels connected between the first port and the N second ports, each of the N channels is provided with a filter, and the filter on each channel is used to filter a signal on each channel, where N is a positive integer greater than 1, and the method includes:
the N channels divide a first signal input from the first port such that the divided first signal is output from the N second ports, and/or
The N channels combine second signals input from the N second ports, so that the combined second signals are output from the first port.
Optionally, in an implementation manner of the fourth aspect, the TMA further includes a control circuit, and at least one of the N channels is further provided with an amplifying circuit, a first radio frequency switch group connected to a first end of the amplifying circuit, and a second radio frequency switch group connected to a second end of the amplifying circuit, where the amplifying circuit includes at least one low noise amplifier LNA, and the method further includes:
the control circuit detects current on the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in the at least one LNA is connected with one end of the first end and the second end, which detects current first, and the input end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later;
the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit;
and the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
When the TMA based on the embodiment of the invention is used in different application scenes, the states of the switches in the radio frequency switch groups at the two ends of the amplifying circuit are adjusted to control the LNA in the amplifying circuit to be adaptive to the current scene, so that the TMA can amplify signals in any application scene. Because the TMA can intelligently judge the signal flow direction and correspondingly amplify the signal, the errors caused by wiring on the tower are reduced. And the TMA reduces the expenditure of operators, reduces the engineering quality risk and is easy to realize the product normalization.
Drawings
FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention.
FIG. 2 is a schematic diagram of another application scenario of the embodiment of the present invention
Figure 3 is a schematic block diagram of a TMA of an embodiment of the present invention.
FIG. 4 is a schematic view of a TMA according to an embodiment of the present invention.
Fig. 5 is a schematic connection diagram of an amplifying circuit and a radio frequency switch of an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of 1T1R dual-frequency TMA according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a 2T2R dual-frequency TMA according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be described below with reference to the accompanying drawings
FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention. In fig. 1, a base station 10, a base station 20, a combiner 30, a TMA40, an Antenna (Antenna, abbreviated as "ANT") 50, and an ANT 60 are shown. The signals of the base station 10 and the base station 20 are combined by the combiner 30 and then transmitted to the TMA40, the signals are split and amplified in the TMA40, and the split signals are transmitted to the ANT50 and the ANT 60, respectively.
Fig. 2 is a schematic diagram of another application scenario of an embodiment of the present invention. In fig. 2, a base station 10, a Baseband processing Unit (Baseband Unit, abbreviated as "BBU") 70, a Radio Remote Unit (Radio Remote Unit, abbreviated as "RRU") 80, a TMA40, and an ANT50 are shown. The BBU 70 and the RRU80 may be connected by an optical fiber, a signal from the BBU 70 is transmitted to the TMA40 through the RRU80, the TMA40 combines and amplifies the signal from the RRU80 and the signal transmitted to the TMA40 by the base station 10, and the combined signal reaches the ANT 50. Where TMA40 may only amplify signals from base station 10, signals from BBU 70 may not be amplified since RRU80 is located on the tower.
The TMA in the embodiment of the present invention may implement that the same TMA may be simultaneously applied to a plurality of different scenarios, for example, the TMA40 in the scenario shown in fig. 1 is the same equipment as the TMA40 in the scenario shown in fig. 2, that is, the TMA40 in the scenario shown in fig. 1 may also be applied to the scenario shown in fig. 2. The TMA40 of fig. 1 need only be inverted and may be applied to the scenario of fig. 2.
Further, the TMA in the embodiment of the present invention may further implement a combining function and a splitting function. For example, in the scenario shown in fig. 1, TMA40 may split the signal output by combiner 30, so as to transmit the split signal to ANT50 and ANT 60, respectively; for example, in the scenario shown in fig. 2, TMA40 may combine the signal from base station 10 and the signal from BBU 70, so that the combined signal is transmitted to ANT 50.
Fig. 3 is a schematic block diagram of a TMA 300 according to an embodiment of the present invention, where the TMA 300 includes a control circuit 310, an amplifying circuit 320, a first rf switch group 330 connected to a first end of the amplifying circuit, and a second rf switch group 340 connected to a second end of the amplifying circuit, and the amplifying circuit 320 includes at least one Low Noise Amplifier (LNA) such as LNA 1, LNA 2 to LNA n.
The control circuit 310 is configured to perform current detection on the first terminal and the second terminal, and control switches in the first rf switch group 330 and the second rf switch group 340 to perform state switching according to a result of the current detection, so that an output terminal of a target LNA of the at least one LNA is connected to one of the first terminal and the second terminal, where a current is detected first, and an input terminal of the target LNA is connected to one of the first terminal and the second terminal, where a current is not detected or is detected later;
a first rf switch group 330 and a second rf switch group 340 for performing the state switching according to the control of the control circuit 310;
the target LNA of the amplifying circuit 320 is configured to amplify the uplink signal passing through the target LNA according to the control of the control circuit 310.
The control circuit may also be used to enable communication with a base station.
It can be seen that when the TMA is used in different application scenarios, the LNA in the amplifying circuit is controlled to adapt to the current scenario by adjusting the states of the switches in the radio frequency switch groups at the two ends of the amplifying circuit, so that the TMA can amplify signals in any application scenario in the scenario.
The embodiment of the invention realizes that the method can be suitable for the same TMA in multiple application scenes. Because this TMA can intelligent judgement be signal flow to and control corresponding LNA and realize signal amplification, reduced the complexity of wiring, reduced the mistake that the wiring brought on the tower.
It should be understood that the above-mentioned current may also be referred to as a detection current, and the embodiment of the present invention is not limited to the manner of obtaining the detection current, for example, a portion of the detection current or the detection voltage may be taken as the detection current. Because the detection current is generated at the base station side, in two ends of the amplifying circuit, namely the first end and the second end, if the control circuit detects that the current exists at the first end, the control circuit can judge that the base station is connected with the first end, and the antenna is connected with the other end, so that the transmission direction of the uplink signal is also determined, the control circuit can control the first radio frequency switch and the state of the switch in the second radio frequency switch group to amplify the uplink signal by the target LNA in the amplifying circuit, the input end of the target LNA is connected with the end which does not detect the current or detects the current later, and the output end of the target LNA is connected with the end which detects the current first. Here, the end of the amplifying circuit connected to the antenna side is generally not able to detect a current, but if the base station subsequently supplies power to the antenna, a current can be detected also at the end of the amplifying circuit connected to the antenna side, only at a timing that is later than a timing of a current detected at the end of the amplifying circuit connected to the base station at a timing that is detected at the end of the amplifying circuit connected to the antenna.
The TMA according to the embodiment of the present invention will be described in detail below by taking fig. 4 and 5 as an example.
FIG. 4 is a schematic view of a TMA according to an embodiment of the present invention. A Control Circuit and modulation Circuit (Control Circuit & Modem)310, a Bias Circuit and lightning protection Circuit (Bias Tee & lightning protection)320, a Combiner Port (COM) 101, a Port 102, a Port103, low noise amplifiers LNA301 and LNA302, radio frequency switches SW 401 and SW402, a filter 201, a filter 202, a filter 203, a filter 204, and a Remote electrical downtilt angle (RET) Control unit included in the TMA are shown in fig. 4.
Wherein the filter 202 is a band-pass filter with a corresponding frequency f1(ii) a The filter 203 is a pre-receive filter corresponding to a frequency f2The filter 204 is a post filter and corresponds to a frequency f2(ii) a The filter 201 may be a band pass filter, band stop filter, high pass filter or low pass filter corresponding to a frequency f3. Frequency f1The corresponding radio frequency channel is used for transmitting downlink signals; frequency f2The corresponding radio frequency channel is used for transmitting the uplink signalIn the transmission process of the uplink signal, the uplink signal needs to be amplified; frequency f3The corresponding radio frequency channel may be used for transmission of both uplink and downlink signals.
LNA301 and LNA302 constitute an amplifying circuit for amplifying the frequency f2Of the signal of (1). The first end of the bias circuit and lightning protection circuit 320 may be connected to the filter 203, the second end of the amplifying circuit may be connected to the filter 204, a radio frequency switch (switch, SW for short) 401 is disposed between the first end of the amplifying circuit and the filter 203, and a radio frequency switch SW402 is disposed between the second end of the amplifying circuit and the filter 204. The rf switches SW 401 and SW402 are single-pole, three-throw switches (three positions are 0 position, 1 position, and 2 position, respectively).
Here, the first terminal refers to a terminal at which the amplifier circuit is connected to the Port COM 101, the second terminal refers to a terminal at which the Port103 is connected, the first terminal is connected to the SW 401, and the second terminal is connected to the SW 402.
The Port COM 101 is simultaneously connected with one ends of the filter 201, the filter 202 and the filter 203, the other end of the filter 201 is connected with the Port 102, the other end of the filter 202 is connected with the Port103, the other end of the filter 203 is connected with the input end of the LNA301 and the output end of the LNA302 through the radio frequency switch SW 401, the output end of the LNA301 is connected with one end of the filter 204, and the other end of the filter 204 is connected with the Port 103.
Here, Port COM 101 may be connected to an antenna and Port 102 and Port103 may be connected to two base stations, respectively, or Port COM 101 may be connected to a base station and Port 102 and Port103 may be connected to two antennas, respectively. These two cases are described below with reference to fig. 1 and 2, respectively.
Case 1
For example, the TMA may be used in the scenario shown in fig. 2 when Port COM 101 is connected to an antenna and Port 102 and Port103 are connected to a base station, respectively, e.g., Port103 is connected to base station 10, Port 102 is connected to RRU80, and Port COM 101 is connected to ANT 50. In this case, the TMA can also realize the frequency f2And frequency f3And (4) combining the two paths of signals.
Since TMA is used to amplify the uplink signals, i.e. here the signals transmitted by COM 101 to Port103, we need to implement the signal amplification in this scenario by LNA301 in the amplification circuit 320.
The upstream signal is transmitted from the Port COM 101 to the Port103, of the first end and the second end of the amplifying circuit 320, the end close to the Port COM 101 is the first end, and the end close to the Port103 is the second end, and the control circuit 310 may detect the current from the Port103 at the first end at the second end, so as to determine that the LNA301 in the amplifying circuit should be used to amplify the upstream signal, and therefore, the switch SW 401 and the switch SW402 should be controlled here so that the input end of the LNA301 is connected to the end where no current is detected or the end where the current is detected later, i.e., the first end, and the output end of the LNA301 is connected to the end where the current is detected, i.e., the second end.
According to the result of the current detection, the control circuit 310 controls the single-pole-three-throw switch SW 401 to switch to the 1 position, controls the single-pole-three-throw switch SW402 to switch to the 1 position, and controls the LNA301 to be powered on so as to enable the LNA301 to be in the working state, and when an uplink signal is transmitted from the first end to the second end of the amplifying circuit 320, the LNA301 can amplify the signal. The LNA302 may be powered off at this time.
Case 2
For example, the TMA may be used in the scenario shown in fig. 1 when Port COM 101 is connected to a base station and Port 102 and Port103 are connected to two antennas, respectively, e.g., Port 102 is connected to ANT 40, Port103 is connected to ANT50, and Port COM 101 is connected to base station 10 (or base station 20). In this case, the TMA can also realize the frequency f2And frequency f3And (4) splitting the two signals of the frequency.
Since TMA is used to amplify the uplink signals, i.e. here the signals transmitted by ports 103 to COM 101, we need to implement the signal amplification in this scenario by LNA302 in the amplifying circuit 320.
The uplink signal is transmitted from the Port103 to the Port COM 101, among the first end and the second end of the amplifying circuit 320, the end close to the COM Port is the first end, and the end close to the Port103 is the second end, the control circuit 310 may detect the current from the Port COM 101 at the first end first, so as to determine that the LNA302 in the amplifying circuit should be used to amplify the uplink signal, and therefore, the switch SW 401 and the switch SW402 should be controlled so that the input end of the LNA302 is connected to the end where no current is detected or the end where the current is detected later, that is, the second end, and the output end of the LNA302 is connected to the end where the current is detected, that is, the first end.
According to the direction of the detected current, the control circuit 310 controls the SWs 401 to switch to the 2-position, controls the SWs 402 to switch to the 2-position, and controls the LNA302 to be powered on to enable the LNA302 to be in the working state, and when an uplink signal is transmitted from the second end to the first end of the amplifying circuit 320, the LNA302 can amplify the signal. The LNA301 may be powered off at this time, leaving it in the off state.
If the power supply is dead or the TMA is not in use, control circuit 310 may control both SW 401 and SW402 to switch to the 0 position and LNA301 and LNA302 are not powered.
In the amplifying circuit described above, two LNAs are included, and in practice, one LNA is also included, and in this case, amplification of signals in different directions can be realized through two different lines connected to two ends of the LNA, so as to realize application of TMA in different scenarios.
Fig. 5 is a schematic connection diagram of an amplifying circuit and a radio frequency switch of an embodiment of the present invention. The amplifying circuit 320 (including the LNA301 and the LNA302), the SW 401, and the SW402 shown in fig. 4 may be replaced with the amplifying circuit and the radio frequency switch shown in fig. 5. Fig. 5 shows an LNA303, which is comprised by the amplifying circuit 320, the LNA303 having an input connected to the filter 203 and an output connected to the filter 204, the LNA303 being adapted to amplify a frequency f2The uplink signal of (2). Radio frequency switches SW 403 and SW 404 are arranged between the input end of the LNA303 and the filter 203, and radio frequency switches SW405 and SW406 are arranged between the output end of the LNA303 and the filter 204. The RF switches SW 403, SW 404, SW405 and SW406 are all single-pole multi-throw switches (SW 403 and SW406 are single-pole three-throw switches with three positions of 0 position, 1 position and 2 position, respectively; SW 404 and SW405 are both single-pole double-throw switchesThrow switch, two gears are 0 position and 1 position respectively).
For example, the TMA may be used in the scenario shown in fig. 2 when Port COM 101 is connected to an antenna and Port 102 and Port103 are connected to a base station, respectively, e.g., Port103 is connected to base station 10, Port 102 is connected to RRU80, and Port COM 101 is connected to ANT 50. In this case, the TMA may also be implemented with a frequency f2And a frequency of f3And combining the two paths of signals. The detection current is generated by the Port103, the control circuit 310 controls the single-pole double-throw switch SW 403 to switch to the 1 position, controls the single-pole double-throw switch SW 404 to switch to the 0 position, controls the single-pole double-throw switch SW405 to switch to the 0 position, and controls the single-pole double-throw switch SW406 to switch to the 1 position according to the current detection result. When the LNA303 is controlled to be powered on to enable the LNA303 to be in an operating state, the input terminal of the LNA303 is connected to the COM 101 through the filter 203, the output terminal of the LNA303 is connected to the Port103 through the filter 204, and when an uplink signal is transmitted from the first terminal to the second terminal of the amplification circuit 320, the LNA303 can amplify the signal.
The TMA may be used in the scenario shown in fig. 1 when Port COM 101 is connected to a base station and Port 102 and Port103 are connected to two antennas, respectively, for example, Port 102 is connected to ANT 40, Port103 is connected to ANT50, and Port COM 101 is connected to base station 10 (or base station 20). In this case, the TMA can also realize the frequency f2And frequency f3And (4) splitting the two signals. In this case, the TMA may also split the single signal from the base station into the frequency f2And a frequency of f3The two signals of (2). The detection current is generated from the port COM 101, the control circuit 310 controls the SPDT SW406 to switch to the 2 position, controls the SPDT SW 404 to switch to the 1 position, controls the SPDT SW405 to switch to the 1 position, and controls the SPDT SW 403 to switch to the 2 position according to the current detection result. And controlling the power-on of the LNA303 to enable the LNA303 to be in an operating state, wherein the output end of the LNA303 is connected with the COM 101 through the filter 203, the input end of the LNA303 is connected with the Port103 through the filter 204, and when an uplink signal exists from the second end to the first end of the amplifying circuit 320Upon transmission, the LNA303 is able to amplify the signal.
If the power supply is dead or the TMA is not in use, control circuit 310 may control SW 403 and SW406 to both switch to the 0 position and LNA303 may not be powered.
Therefore, when the TMA of the embodiment of the present invention is used in different application scenarios, the LNA in the amplifying circuit is controlled to adapt to the current scenario by adjusting the states of the switches in the radio frequency switch groups at both ends of the amplifying circuit, so that the TMA can amplify signals in any application scenario in the scenario. Because the TMA can intelligently judge the signal flow direction and correspondingly amplify the signal, the errors caused by wiring on the tower are reduced. And the TMA reduces the expenditure of operators, reduces the engineering quality risk and is easy to realize the product normalization.
The TMA according to another embodiment of the present invention may be used to combine multiple signals and split one signal. The TMA comprises a first port, N second ports, and a plurality of channels connected between the first port and the N second ports, wherein a filter is disposed on each of the N channels, and the filter on each channel is used for filtering a signal on each channel.
The N channels are used for splitting a first signal input from a first port so that the split first signal is output from N second ports, and/or combining a second signal input from the N second ports so that the combined second signal is output from the first port, where N is a positive integer greater than 1.
Optionally, the TMA further includes a control circuit as described in the foregoing fig. 3 to fig. 5, and at least one of the N channels is further provided with an amplifying circuit, a first rf switch set, and a second rf switch set as described in the foregoing fig. 3 to fig. 5.
For example, when a first port is connected to a base station and N second ports are connected to N antennas, the TMA may split a first signal input from the first port by the base station, so that the split first signal is output from the N second ports to the N antennas; when the first port is connected to the antenna and the N second ports are connected to the N base stations, the TMA may combine the second signals input from the N second ports by the N base stations, so that the combined second signals are output from the first port to the antenna.
Taking fig. 4 as an example, when Port COM 101 is connected to an antenna and Port 102 and Port103 are connected to a base station respectively, the TMA may be used in the scenario shown in fig. 2, for example, Port103 is connected to base station 10 correspondingly, Port 102 is connected to RRU80 correspondingly, and Port COM 101 is connected to ANT50 correspondingly. The signal from the Port103 is combined with the other signal after sequentially passing through the filter 204, the LNA302 and the filter 203 on the channel between the Port103 and the COM 101; the other signal, i.e., the signal from Port 102, is combined with the signal output from filter 203 after passing through filter 201 on the channel between Port 102 and COM 101. The combined signal is finally transmitted to the COM 101 to reach an antenna, so that the frequency f is realized2And a frequency of f3And (4) combining the two paths of signals.
The TMA may be used in the scenario shown in fig. 1 when Port COM 101 is connected to a base station and Port 102 and Port103 are connected to two antennas, respectively, for example, Port 102 is connected to ANT 40, Port103 is connected to ANT50, and Port COM 101 is connected to base station 10 (or base station 20). The signal from the COM 101 can be divided into two paths of signals, wherein one path of signal is transmitted to the Port103 on a channel between the COM 101 and the Port103 after sequentially passing through the filter 203, the LNA302 and the filter 204, and reaches an antenna connected to the Port 103; the other signal is transmitted to Port 102 through a filter 201 on the channel between COM 101 and Port 102, and reaches the antenna connected to Port 102. The combined signal is finally transmitted to the COM 101 to reach an antenna, so that one path of signal is divided into frequency f2And frequency f3These two signals.
In this embodiment, the TMA includes a plurality of radio frequency channels, and can combine and split signals.
In a more general scenario, the TMA may be used in a multiple-input multiple-output scenario, and may include a control circuit and a plurality of sets of the amplifying circuit, the first rf switch set, and the second rf switch set as described in fig. 3 to 5.
For example, fig. 6 shows a schematic structure of a 1Transmit 1Receive (1T 1R) dual-frequency TMA, which can realize the frequency f2And frequency f5And further the frequency f can be realized3Frequency f2And frequency f5The combination or the division of the signals on the corresponding channels.
For example, fig. 7 shows a schematic structure of a 2-transceiver 2-T2R dual-frequency TMA, which can implement the frequency f2And frequency f5And further, the frequency f of the pair is realized in radio frequency circuits connected under two COM ports respectively3Frequency f2And frequency f5The combination or the division of the signals on the corresponding channels.
An embodiment of the present invention further provides a method for signal transmission in a tower mounted amplifier TMA, where the TMA includes a control circuit, an amplification circuit, a first radio frequency switch group connected to a first end of the amplification circuit, and a second radio frequency switch group connected to a second end of the amplification circuit, and the amplification circuit includes at least one low noise amplifier LNA, and the method includes:
the control circuit detects current on the first end and the second end of the amplifying circuit and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in at least one LNA is connected with one end of the first end and the second end, which detects current first, and the output end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later;
the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit;
the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
Optionally, the amplifying circuit comprises two LNAs, the first RF switch set comprises a single-pole multi-throw switch, the second RF switch set comprises a single-pole multi-throw switch,
the control circuit detects current at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit comprises: the control circuit detects current on the first end and the second end and controls the single-pole multi-throw switch in the first radio frequency switch group and the single-pole multi-throw switch in the second radio frequency switch group to switch states according to the current detection result;
the first radio frequency switch group and the second radio frequency switch group switch states according to the control of the control circuit, and the state switching method comprises the following steps: the single-pole multi-throw switch in the first radio frequency group switches states according to the control of the control circuit; and the single-pole multi-throw switch in the second radio frequency group switches states according to the control of the control circuit.
Optionally, the amplifying circuit comprises an LNA, the first rf switch set comprises two single-pole-multi-throw switches, the second rf switch set comprises two single-pole-multi-throw switches,
the control circuit detects current at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit comprises: the control circuit detects current on the first end and the second end and controls the single-pole multi-throw switch in the first radio frequency switch group and the single-pole multi-throw switch in the second radio frequency switch group to switch states according to the current detection result;
the first radio frequency switch group and the second radio frequency switch group switch states according to the control of the control circuit, and the state switching method comprises the following steps: the single-pole multi-throw switch in the first radio frequency group switches states according to the control of the control circuit; and the single-pole multi-throw switch in the second radio frequency group switches states according to the control of the control circuit.
Another embodiment of the present invention provides a method for signal transmission in a tower mounted amplifier TMA, where the TMA includes a first port, N second ports, and N channels connected between the first port and the N second ports, each of the N channels is provided with a filter, the filter on each channel is used to filter a signal on each channel, N is a positive integer greater than 1, and the method includes: the N channels divide a first signal input from the first port so that the divided first signal is output from the N second ports, and/or the N channels combine second signals input from the N second ports so that the combined second signal is output from the first port.
Optionally, the TMA further includes a control circuit, and at least one of the N channels is further provided with an amplifying circuit, a first rf switch bank connected to a first end of the amplifying circuit, and a second rf switch bank connected to a second end of the amplifying circuit, and the amplifying circuit includes at least one low noise amplifier LNA, and the method further includes:
the control circuit detects current on the first end and the second end of the amplifying circuit and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in at least one LNA is connected with one end of the first end and the second end, which detects current first, and the output end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later; the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit; the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
For example, as shown in fig. 4, the TMA may be used in the scenario shown in fig. 2 when Port COM 101 is connected to an antenna and Port 102 and Port103 are connected to a base station, respectively, e.g., Port103 is connected to base station 10, Port 102 is connected to RRU80, and Port COM 101 is connected to ANT 50. In this case, the TMA may also be implemented with a frequency f2And a frequency of f3And combining the two paths of signals.
The TMA may be used in the scenario shown in fig. 1 when Port COM 101 is connected to a base station and Port 102 and Port103 are connected to two antennas, respectively, for example, Port 102 is connected to ANT 40, Port103 is connected to ANT50, and Port COM 101 is connected to base station 10 (or base station 20). In this case, the TMA may also realize f2Frequency sum f3Two frequenciesAnd (4) splitting the path signal.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (12)

1. A tower mounted amplifier TMA, the TMA comprising a control circuit, an amplification circuit, a first set of radio frequency switches connected to a first terminal of the amplification circuit and a second set of radio frequency switches connected to a second terminal of the amplification circuit, the amplification circuit comprising at least one Low Noise Amplifier (LNA),
the control circuit is configured to perform current detection on the first terminal and the second terminal, and control switches in the first radio frequency switch group and the second radio frequency switch group to perform state switching according to a result of the current detection, so that an output terminal of a target LNA in the at least one LNA is connected to one of the first terminal and the second terminal, where a current is detected first, and an input terminal of the target LNA is connected to one of the first terminal and the second terminal, where a current is not detected or is detected later;
the first radio frequency switch group and the second radio frequency switch group are used for switching the states according to the control of the control circuit;
and the target LNA is used for amplifying the uplink signal passing through the target LNA under the control of the control circuit.
2. The TMA of claim 1 wherein the amplification circuit comprises two LNAs, the first set of radio frequency switches comprises a single-pole, multi-throw switch, and the second set of radio frequency switches comprises a single-pole, multi-throw switch.
3. The TMA of claim 1 wherein the amplification circuit comprises one LNA, the first set of radio frequency switches comprises two single-pole, multi-throw switches, and the second set of radio frequency switches comprises two single-pole, multi-throw switches.
4. A tower mounted amplifier TMA, comprising a first port, N second ports, and N channels connected between the first port and the N second ports, each of the N channels having a filter disposed thereon for filtering a signal on each channel,
the N channels are used for splitting a first signal input from the first port so that the split first signal is output from the N second ports, and/or
And combining second signals input from the N second ports so that the combined second signals are output from the first port, wherein N is a positive integer greater than 1.
5. The TMA of claim 4, wherein at least one of the N channels comprises a control circuit, an amplification circuit, a first bank of radio frequency switches connected to a first terminal of the amplification circuit, and a second bank of radio frequency switches connected to a second terminal of the amplification circuit, the amplification circuit comprising at least one Low Noise Amplifier (LNA),
the control circuit is configured to perform current detection on the first terminal and the second terminal, and control switches in the first radio frequency switch group and the second radio frequency switch group to perform state switching according to a result of the current detection, so that an output terminal of a target LNA in the at least one LNA is connected to one of the first terminal and the second terminal, where a current is detected first, and an input terminal of the target LNA is connected to one of the first terminal and the second terminal, where a current is not detected or is detected later;
the first radio frequency switch group and the second radio frequency switch group are used for switching the states according to the control of the control circuit;
and the target LNA is used for amplifying the uplink signal passing through the target LNA under the control of the control circuit.
6. The TMA of claim 5, wherein the amplification circuit comprises two LNAs, the first bank of radio frequency switches comprises a single-pole-multiple-throw switch, and the second bank of radio frequency switches comprises a single-pole-multiple-throw switch.
7. The TMA of claim 5, wherein the amplification circuit comprises one LNA, the first bank of radio frequency switches comprises two single pole, multiple throw switches, and the second bank of radio frequency switches comprises two single pole, multiple throw switches.
8. A method of signal transmission in a tower mounted amplifier, TMA, comprising a control circuit, an amplification circuit, a first set of radio frequency switches connected to a first terminal of the amplification circuit and a second set of radio frequency switches connected to a second terminal of the amplification circuit, the amplification circuit comprising at least one low noise amplifier, LNA, the method comprising:
the control circuit detects current on the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in the at least one LNA is connected with one end of the first end and the second end, which detects current first, and the input end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later;
the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit;
and the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
9. The method of claim 8, wherein the amplification circuit comprises two LNAs, wherein the first set of RF switches comprises a single-pole-multiple-throw switch, wherein the second set of RF switches comprises a single-pole-multiple-throw switch,
the control circuit detects currents at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit includes:
the control circuit detects current on the first end and the second end and controls the single-pole multi-throw switch in the first radio frequency switch group and the single-pole multi-throw switch in the second radio frequency switch group to switch states according to the current detection result;
the state switching of the first radio frequency switch group and the second radio frequency switch group is carried out according to the control of the control circuit, and the state switching comprises the following steps:
the single-pole multi-throw switch in the first radio frequency group performs state switching according to the control of the control circuit;
the single-pole multi-throw switch in the second radio frequency group carries out the state switching according to the control of the control circuit.
10. The method of claim 8, wherein the amplification circuit comprises an LNA, wherein the first bank of RF switches comprises two single-pole-multiple-throw switches, wherein the second bank of RF switches comprises two single-pole-multiple-throw switches,
the control circuit detects currents at the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, and the control circuit includes:
the control circuit detects current on the first end and the second end and controls a single-pole multi-throw switch in the first radio frequency switch group and a single-pole multi-throw switch in the second radio frequency switch group to switch states according to the detection result;
the state switching of the first radio frequency switch group and the second radio frequency switch group is carried out according to the control of the control circuit, and the state switching comprises the following steps:
the single-pole multi-throw switch in the first radio frequency group performs state switching according to the control of the control circuit;
the single-pole multi-throw switch in the second radio frequency group carries out the state switching according to the control of the control circuit.
11. A method for signal transmission in a tower mounted amplifier TMA, wherein the TMA includes a first port, N second ports, and N channels connected between the first port and the N second ports, each of the N channels having a filter disposed thereon, the filter on each channel being configured to filter a signal on each channel, N being a positive integer greater than 1, the method comprising:
the N channels divide a first signal input from the first port such that the divided first signal is output from the N second ports, and/or
The N channels combine second signals input from the N second ports, so that the combined second signals are output from the first port.
12. The method of claim 11, wherein the TMA further comprises control circuitry, and wherein at least one of the N channels further has disposed thereon amplification circuitry, a first set of radio frequency switches connected to a first end of the amplification circuitry, and a second set of radio frequency switches connected to a second end of the amplification circuitry, the amplification circuitry comprising at least one Low Noise Amplifier (LNA), the method further comprising:
the control circuit detects current on the first end and the second end, and controls switches in the first radio frequency switch group and the second radio frequency switch group to switch states according to the current detection result, so that the output end of a target LNA in the at least one LNA is connected with one end of the first end and the second end, which detects current first, and the input end of the target LNA is connected with one end of the first end and the second end, which does not detect current or detects current later;
the first radio frequency switch group and the second radio frequency switch group carry out state switching according to the control of the control circuit;
and the target LNA amplifies an uplink signal passing through the target LNA under the control of the control circuit.
CN201611070169.XA 2016-11-29 2016-11-29 Tower amplifier and method for signal transmission in tower amplifier Active CN108123725B (en)

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WO2014101340A1 (en) * 2012-12-28 2014-07-03 成都泰格微波技术股份有限公司 High-performance radio frequency channel of a tdd lte tower mounted amplifier

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CN205453686U (en) * 2015-12-17 2016-08-10 京信通信技术(广州)有限公司 Multimode is antenna receiving and dispatching link altogether

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Publication number Priority date Publication date Assignee Title
CN2800677Y (en) * 2005-01-10 2006-07-26 京信通信***（广州）有限公司 Bypass apparatus for duplex tower top amplifier of mobile communication system
CN201726540U (en) * 2010-06-28 2011-01-26 京信通信***（中国）有限公司 Time division duplex system and tower mounted amplifier based on same
WO2014101340A1 (en) * 2012-12-28 2014-07-03 成都泰格微波技术股份有限公司 High-performance radio frequency channel of a tdd lte tower mounted amplifier
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