WO2008141560A1

WO2008141560A1 - Base station system, tower top amplifier, base station and method for measuring a length of a feeder line

Info

Publication number: WO2008141560A1
Application number: PCT/CN2008/070870
Authority: WO
Inventors: Xin Chen
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-05-17
Filing date: 2008-05-04
Publication date: 2008-11-27
Also published as: CN101068386A; CN101068386B

Abstract

A base station system, tower top amplifier, base station and a method for measuring a length of a feeder line are provided in the present invention embodiments, the base station system comprises the base station, the feeder lines, the tower top amplifier and an antenna, and also comprises a switch for making an uplink signal input end and a downlink signal output end of the feeder line in a state of connection or a state of disconnection; furthmore, the base station system also could comprise: a current measurement device for measuring a current value of a loop formed by the base station and the feeder line when the uplink signal input end and the downlink signal output are in the state of connection; a voltage measurement device for measuring a voltage value between the uplink signal output end and the downlink signal input end in the loop when the uplink signal input end and the downlink signal output end of the feeder line are in the state of connection. The length of the feeder line in the base station system could be measured accurately by using the present invention embodiments.

Description

Base station system, tower amplifier, base station and feeder length measuring method

Technical field

The present invention relates to wireless communication technologies, and more particularly to a base station system, a tower amplifier, a base station, and a feeder length measurement method. Background of the invention

With the development of mobile communication technologies, mobile communication networks have now transitioned from the 2G era to the 3G era and continue to move forward. Wireless signal coverage is a basic requirement for providing mobile communication services, which requires a base station system for providing wireless signal coverage, including base stations, feeders and antennas. As shown in FIG. 1 , it is a schematic structural diagram of a prior art base station system. In the base station system, after a wireless signal is output from a base station, it is transmitted through a feeder or a feeder cable composed of a plurality of feeders in parallel, and then transmitted by an antenna. .

In the actual application process of the network, due to the resistance of the feeder, the downlink signal transmitted by the base station to the mobile terminal will be consumed by the feeder when part of the power is transmitted through the feeder, and the power consumption of the part will increase with the increase of the feeder. increase. For the power loss of the downlink signal, the power of the base station can be improved, that is, the power of the signal transmitted by the base station is increased to compensate the power consumed by the feeder, so that the terminal can identify the downlink signal transmitted by the base station without being affected. For the uplink signal transmitted by the mobile terminal to the base station, the presence of the feeder also consumes a part of the power, affecting the base station to identify the uplink signal, and reducing the sensitivity of the base station identification signal. The longer the feeder line, the worse the sensitivity of the base station identification signal, and the performance of the base station system. The worse it is. In the prior art, in order to improve the processing performance of the base station system for the uplink signal, a tower top amplifier is added between the feeder and the antenna, and the uplink signal received by the antenna is amplified to compensate the loss of the uplink signal power of the feeder line, as shown in the figure. 2 is a schematic structural diagram of another embodiment of a prior art base station system in which a tower top amplifier is added. The gain value of the tower top amplifier needs to be determined by the length of the feeder. If the gain value is set too high, it will inevitably cause new noise, which will affect the correct identification of the uplink signal by the base station, and the higher the gain, the power consumption. The larger, this will affect the stability of the tower amplifier, and its power supply requirements are also higher; if the gain is too small, the loss of the upstream signal of the feeder can not be fully compensated, and the compensation effect is not good. Therefore, how to accurately measure the feeder length. Therefore, setting a reasonable gain value of the tower amplifier according to the length of the feeder line is a problem that must be solved to ensure the performance of the base station system.

In the prior art, the method of manual estimation is mainly used, for example, manual visual observation, manual trajectory, etc., to measure the length of the feeder. However, since the feeder cable usually needs to be disposed in the wiring well of the building, the actual length and each base station The actual routing is related to the fact that the exact length of the feeder cannot be known by means of manual estimation, so that the gain value of the tower amplifier cannot be reasonably set. Summary of the invention

Embodiments of the present invention provide a base station system, a tower amplifier, a base station, and a feeder length measuring method, which can know the exact length of the feeder.

An embodiment of the present invention provides a base station system, including a base station, a feeder, a tower amplifier, and an antenna, and further includes:

And a switch for connecting or disconnecting the uplink signal input end and the downlink signal output end of the feeder.

An embodiment of the present invention provides a tower amplifier, including an uplink channel and a downlink channel, and an adjustment module for adjusting a gain value of the power amplification module in the uplink channel, and the method further includes:

And a switch, configured to enable a connection or disconnection between the downlink channel input end and the uplink channel output end.

A base station provided by an embodiment of the present invention includes: Client, used to generate a switch control command that controls the switch to be in a closed or open state. An embodiment of the present invention provides a method for measuring a length of a feeder, including:

Closing a switch disposed between the upstream signal input end and the downlink signal output end of the feeder line to form a loop between the base station and the feeder line;

Measuring a voltage value between the uplink signal output end and the downlink signal input end in the loop and a current value of the loop;

Calculating the length of the feeder according to the voltage value, the current value, and the resistivity of the feed line stored in advance, where V is between the uplink signal output end and the downlink signal input end in the loop The voltage value, I is the current value in the loop, is the resistivity of the feed line.

An embodiment of the present invention provides a method for setting a gain value of a tower amplifier, comprising: closing a switch disposed between an uplink signal input end and a downlink signal output end of the feeder line, so that the base station and the feeder line form a loop;

Calculating a feeder length for transmitting an uplink signal between the base station and the tower amplifier according to the voltage value, the current value, and a pre-stored resistivity of the feeder;

The gain value of the tower amplifier is set according to the length of the feeder.

In the embodiment of the present invention, a switch is arranged between the uplink signal input end and the downlink signal output end of the feeder, and the feeder and the base station form a loop by controlling the closing of the switch, and then measuring the current value of the loop and the uplink signal output end and the downlink signal input end. The voltage value between the terminals and the resistivity of the feeder are used to accurately measure the length of the feeder between the base station and the tower amplifier. Compared with the prior art, the measurement result is more accurate; the base station is provided with a client to generate a switch control command that the control switch is in a closed or open state, and the measurement knot is realized without manually closing the switch. Automation of the fruit; According to the accurate measurement result of the length of the feeder, the gain value of the tower amplifier can be set more reasonably, so that the loss of the communication signal of the feeder can be better compensated in the case of more effectively ensuring the stability performance of the base station system. . BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will become more apparent to those skilled in the <

FIG. 1 is a schematic structural diagram of a prior art base station system.

2 is a schematic structural diagram of another embodiment of a prior art base station system.

FIG. 3 is a schematic structural diagram of an embodiment of a base station system according to the present invention.

4 is a schematic structural view of an embodiment of a tower amplifier of the present invention.

FIG. 5 is a schematic structural view of another embodiment of a tower amplifier of the present invention.

FIG. 6 is a schematic structural diagram of an embodiment of a base station according to the present invention.

7 is a flow chart of an embodiment of a method for measuring a length of a feeder line according to the present invention.

FIG. 8 is a flow chart of another embodiment of a method for measuring a length of a feeder line according to the present invention.

9 is a flow chart of still another embodiment of a method for measuring a length of a feeder line according to the present invention.

FIG. 10 is a schematic structural diagram of another embodiment of a base station system according to the present invention.

11 is a flow chart of an embodiment of a method of setting a gain value of a tower amplifier in accordance with the present invention. Mode for carrying out the invention

In the embodiment of the present invention, a switch is arranged between the uplink signal input end and the downlink signal output end of the feeder in the base station system. When the length of the feeder line needs to be measured, the switch is closed, so that the base station and the feeder line form a loop, and the current value of the loop and the uplink of the feeder line are measured. The voltage value between the signal output terminal and the downstream signal input terminal accurately calculates the length of the feeder line between the base station and the tower top amplifier based on the voltage value, the current value, and the resistivity of the feeder line. As shown in FIG. 3, it is a schematic structural diagram of an embodiment of a base station system according to the present invention. The base station system of the embodiment includes a base station 1, a feeder 2, a tower amplifier 3 and an antenna 4 connected in sequence, and an uplink signal input end and a downlink of the feeder. A switch 5 is arranged between the signal output ends, and the switch can also be disposed in the tower top amplifier 3 at its downstream signal input end for connecting or disconnecting the upstream signal input end and the downstream signal output end of the feed line 2 State, when switch 5 is closed, base station 1 forms a loop with feeder 2. The current measuring device 6 can be externally connected to the current measuring device or at any position in the loop that can be formed for measuring the base station 1 and the feeder 2 when the upstream signal input terminal and the downstream signal output terminal of the feeder 2 are in a closed state. The current value of the formed loop; an external voltage measuring device or a voltage measuring device 7 between the upstream signal output end and the downstream signal input end of the feed line 2 for the upstream signal input end and the downstream signal output end of the feed line 2 When in the closed state, the other ends of the feeder 2 in the closed loop are measured, that is, the voltage value between the upstream signal output terminal and the downstream signal input terminal connected by the voltage measuring device 7. The tower top amplifier 3 can also directly connect with the base station 1 to directly receive the gain value adjustment command sent by the base station, and can also receive the gain value adjustment command sent by the base station 1 through the feeder 2, that is, the base station 1 can pass the feeder 2 to the top of the tower. The amplifier 3 transmits a gain value adjustment command, and the gain value adjustment command can also be transmitted to the tower top amplifier 3 through a channel other than the feeder.

The base station and the feeder are formed into a loop by a switch, and the current voltage measuring device and the voltage measuring device respectively can be used to measure the terminal voltage value V and the current value I of the circuit, and the resistivity of the known feeding line is divided by the current value according to the formula 丄I and the resistivity, then get the loop

2 I *

The length of the feeder, divided by 2, accurately measures the length of the feeder that transmits the upstream signal between the base station and the tower amplifier.

Referring to FIG. 3, the base station system of the embodiment of the present invention may further include a control device 8 for providing a human-machine interaction interface, generating a switch control command according to an instruction of the user, and controlling the opening. Off 5 is in the closed or open state. The control device 8 may be provided in the base station 1, or may be provided at any position between the base station 1 and the tower amplifier 3, or may be provided in the tower amplifier 3.

By means of the control device to control the closing and opening states of the switch, an automated measurement of the length of the feeder is achieved, avoiding the manual manual closing of the switch.

Referring to FIG. 3, the base station system of the embodiment of the present invention may further include a storage device 9 for storing the resistivity of the feeder 2, and a computing device 10 for using the feeder stored in the storage device 9. The resistivity of 2, the current value of the loop measured by the current measuring device 6, and the voltage value measured by the voltage measuring device 7 calculate the length of the feeder 2 for transmitting the upstream signal between the base station 1 and the tower amplifier 3. The storage device 9 and the computing device 10 can be integrally provided.

After measuring the terminal voltage value and current value of the loop formed by the base station and the feeder, the computing device combines the resistivity of the pre-stored feeder, and calculates the length of the feeder between the base station and the tower amplifier, without manual calculation, so that the length of the feeder The measurement is more precise and convenient.

As shown in FIG. 4, it is a schematic structural diagram of an embodiment of a tower amplifier according to the present invention. The tower amplifier of the embodiment of the present invention includes an uplink channel and a downlink channel, and a power amplification module 31 is provided in the uplink channel for transmitting to the base station. The upstream signal is subjected to gain amplification. The power amplification module 31 receives the power amplification factor of the received signal, that is, the gain value of the power amplification module 31; the tower top amplifier further includes an adjustment module 32 for adjusting the gain value of the power amplification module 31, A switch 5 is disposed between the channel output end and the downlink channel input end. Since the downlink channel input end is connected to the downlink signal output end of the feeder line, the uplink channel output end is connected to the uplink signal input end of the feeder line. Therefore, the switch 5 can make the feeder line The uplink signal input end and the downlink signal output end are in a connected or disconnected state, so that the base station and the feeder line form a loop. The biasing module 33 and the coupling module 34 are connected to the channel and the downlink channel. Offset module 33 is set in the tower The downlink signal input end of the top amplifier is configured to separate the uplink signal sent to the output of the uplink channel, the downlink signal sent to the input end of the downlink channel, and the gain value adjustment command sent to the adjustment module 32, and send the received uplink signal to the feeder. The downlink signal is sent to the downlink channel, and the gain value adjustment command is sent to the adjustment module 32. Specifically, the switch 5 may be disposed before the downlink signal input end of the bias module 33, or may be disposed in the bias module 33, and connected thereto. The downlink signal output end and the uplink signal input end are connected or disconnected; the coupling module 34 is disposed at the uplink signal input end of the tower top amplifier, and is configured to send the uplink signal sent to the uplink channel input end and the downlink signal sent to the downlink channel output end. The signal is separated, the uplink signal is sent to the power amplifying module 31, the downlink signal is sent to the antenna, and the downlink signal leaking to the uplink channel and the uplink signal leaking to the downlink channel are attenuated.

Referring to FIG. 4, the tower top amplifier of the embodiment of the present invention may further include a control module 35 connected to the switch 5 for controlling the switch 5 to be in a closed or open state. Accordingly, the bias module 33 is specifically configured to be sent to The uplink signal at the output of the uplink channel, the downlink signal sent to the input of the downlink channel, and the gain value adjustment command sent to the adjustment module 32 are separated from the switch control command sent to the control module 35, and the received uplink signal is sent to the feeder, and the downlink is sent. The signal is sent to the downlink channel, and the gain value adjustment command and the switch control command are sent to the adjustment module 32 and the control module 35, respectively. The control module 35 can be integrally provided with the adjustment module 32. Further, the tower-top amplifier of the embodiment of the present invention may further include an identification module 36 disposed between the biasing module 33 and the control module 35 and the adjustment module 32 for identifying information sent by the biasing module 33, if the information is The switch control command is sent to the control module 35, so that the control module 35 controls the closed or open state of the switch according to the switch control command; if the information is a gain value adjustment command, it is sent to the adjustment module 32, Therefore, the adjustment module 32 adjusts the gain value of the power amplification module 31 according to the gain value adjustment command. The biasing module 33 may also directly connect to the base station 1 to directly receive the switch control command and/or the gain value adjustment command sent by the base station, or may receive the base station 1 through the feeder 2. The switch control command and/or the gain value adjustment command are sent, that is, the base station 1 can send the switch control command and/or the gain value adjustment command to the bias module 33 via the feeder 2, or can be offset by other channels than the feeder 2 Module 33 transmits a switch control command and/or a gain value adjustment command.

In addition, referring to FIG. 4, the tower top amplifier shown in the embodiment of the present invention may further include a first filtering module 37 and/or a second filtering module 38 and/or a third filtering module 39, wherein the first filtering module 37 It is disposed between the coupling module 34 and the power amplification module 31 for filtering the uplink signal sent by the coupling module 34. The second filtering module 38 is disposed between the power amplification module 31 and the bias module 33 for power amplification. The upstream signal of the gain amplification of the module 31 is filtered; the third filtering module 39 is disposed between the biasing module 33 and the coupling module 34 for filtering the downlink signal sent by the biasing module 33.

In practical applications, when the antenna is an electric adjustable wire, the power supply module and the current limiting module may be disposed in the tower top amplifier, the biasing module 33, the power supply module and the current limiting module are sequentially connected, and the power supply module completes the tower top amplifier. At the same time, the current is limited by the current limiting module and then sent to the ESC antenna through the auxiliary interface (Auxiliary port, AUX interface).

In the tower-top amplifier of the embodiment of the present invention, the uplink channel and the downlink channel and the switch may be multiple groups. As shown in FIG. 5, it is a schematic structural diagram of another embodiment of the tower amplifier of the present invention. The embodiment includes two sets of uplink channels. With downstream channels and switches. The biasing module, the first filter, the second filter, the third filter, the power amplifying module and the coupling module in the same dotted line frame in FIG. 5 belong to a group of uplink channel and downlink channel, and each group of uplink channel and downlink channel The switch has the same connection relationship with the adjustment module 32, the control module 35, the power supply module, and the current limiting module. Among the multiple sets of uplink channels and downlink channels and switches, at least one of the offset modules receives the switch control command and the gain value sent by the base station 1. The adjustment command is connected to the identification module 36, and receives the gain value adjustment command and the switch control command, and the remaining bias modules have the uplink signal and the downlink signal. The function of separating the numbers is sufficient, and it is not necessary to receive and separate the gain value adjustment command and the switch control command. As shown in FIG. 6 , it is a schematic structural diagram of an embodiment of a base station according to the present invention. The base station is provided with a client 11 for providing a human-machine interaction interface, and generating a switch control for controlling the switch 5 to be in a closed or open state according to an instruction of the user. The command is sent to the control module 35 of the control switch, or sent to the identification module 36 via the bias module 33 or directly to the identification module 36, and sent to the control module 35 by the identification module 36.

FIG. 7 is a flowchart of an embodiment of a method for measuring a length of a feeder line according to the present invention, which includes the following steps:

Step 1: Close the switch between the uplink signal input end and the downlink signal output end of the feeder line in the base station system, and the ^^ station and the feeder line form a loop. Specifically, the switch can be closed manually, or it can be closed by a received switch control command.

Step 2: Measure the voltage value between the upstream signal output end and the downstream signal input end of the feeder in the loop and the current value in the loop.

Step 3: Calculate the length of the feeder between the base station and the tower amplifier based on the measured voltage value, the current value, and the resistivity of the feeder.

By controlling the closing of the switch, the feeder and the base station form a loop, and then measuring the current value of the loop and the voltage value between the upstream signal output terminal and the downstream signal input terminal, and combining the resistivity of the feed line to achieve the relationship between the base station and the tower top amplifier The accurate measurement of the length of the feeder is more accurate than the prior art.

FIG. 8 is a flowchart of another embodiment of a method for measuring a length of a feeder line according to the present invention. The embodiment may be implemented by using the embodiment of the base station system shown in FIG. 3, which includes the following steps:

Step 101: When the user needs to measure the length of the feeder that transmits the uplink signal in the base station system, the user inputs the indication information for closing the switch 5 disposed between the uplink signal input end and the downlink signal output end of the feeder 2 to the control device 8.

Step 102: The control device 8 generates a closing control command according to the indication information input by the user. And the control switch 5 is closed, so that the base station 1 and the feeder 2 form a loop.

Step 103, the voltage measuring device 7 measures the terminal voltage value V between the upstream signal output end and the downstream signal input end of the feeder in the loop and sends it to the computing device 10, and the current measuring device 6 measures the current value I in the loop and transmits To the computing device 10.

Step 104: The computing device 10 obtains the resistivity of the pre-stored feeder from the storage device 9, and combines the voltage value V and the current value I, because the total length of the feeder line in the loop is

I *

The total length of the feeder in the road includes the length of the feeder transmitting the uplink signal and the length of the feeder transmitting the downlink signal, and the length of the feeder transmitting the uplink signal between the base station and the tower amplifier in the base station system

L is i_ *"L , and the feeder that transmits the uplink signal between the base station and the tower amplifier is calculated by _ *"L

2 1 * 2 1 *

Length L.

After calculating the length L of the feeder for transmitting the uplink signal between the base station and the tower amplifier, the gain value of the power amplification module in the uplink channel of the tower amplifier 3 can be adjusted according to the length L, so that the gain and the feeder of the tower amplifier to the uplink signal are The loss is equivalent, and the loss of the uplink signal power of the feeder is accurately compensated.

After setting the gain value of the power amplifying module in the upstream channel of the tower amplifier 3, the user can input an instruction to disconnect the switch 5 provided between the upstream signal input terminal and the downstream signal output terminal of the feeder 2 by inputting to the control device 8. Information, the control device 8 generates a disconnection control command according to the instruction information input by the user to control the switch 5 to be disconnected, so that the base station system operates normally.

The control command for closing and opening the control switch 5 can adopt the AISG command format specified by the Antenna Interface Standards Group (AISG), as shown in Table 1 below, which is an example of the content of the AISG command format: AISG command format

The Version ID is the version identifier; the Command ID is the command identification part, and the corresponding 1 byte indicates that it occupies 1 byte; the Number of data bytes indicates the number of data bytes, the low byte indicates the low byte number, and the high byte indicates the high byte. The number of bytes; Data bytes represent data bytes, Variable length indicates that its length is variable, and the maximum supported byte number is 70 bytes.

According to the AISG standard, the Command ID defines OxFF as a specified command. Under this Command ID, the format of the control command of the control switch 5 is: 0xFF<LengthLowByte> <LengthHighByte> <VendorID>, specifically, the closing control command for controlling the closing of the switch 5 The format may be: OxFF 0x01 0x01 < Vendor ID>; The format of the disconnection control command for controlling the switch 5 to be disconnected may specifically be: OxFF 0x02 0x02 <Vendor ID>.

FIG. 9 is a flowchart of still another embodiment of a method for measuring a length of a feeder line according to the present invention. The embodiment may be implemented by using a base station system embodiment as shown in FIG. 10. In the base station system, the tower amplifier 3 adopts FIG. In the tower-top amplifier of the illustrated embodiment, the base station 1 adopts the base station of the embodiment shown in FIG. 6. The method for measuring the length of the feeder line includes the following steps:

Step 201: The user inputs, to the client 21 in the base station, indication information that the switch 5 disposed between the upstream signal input end and the downlink signal output end of the feeder 2 is closed.

Step 202: The client 21 generates a close control command according to the indication information input by the user, and sends the control command to the bias module 33.

Step 203, the biasing module 33 forwards the closing control command to the identification module 36. Step 204: After the identification module 36 recognizes that it is a closed control command, it forwards it to the control module 35.

Step 205, the control module 35 controls the switch 5 to close according to the closing control command, so that the base station 1 and the feeder 2 form a loop.

Step 206, the voltage measuring device 7 measures the terminal voltage value V between the upstream signal output end and the downstream signal input end of the feeder in the loop and sends it to the computing device 10, and the current measuring device 6 measures the current value I in the loop and transmits To the computing device 10.

Step 207, the computing device 10 obtains the resistivity of the pre-stored feeder from the storage device 9, combines the voltage value V, the current value I, calculates the feeder length L between the base station and the tower amplifier according to 1, and compares the length of the feeder. L, return to the client 21.

Step 208: The user sets the gain value P of the power amplification module 31 according to the feeder length L displayed on the client 21, and inputs the indication information that the gain value of the power amplification module 31 is set to P to the client 21.

Step 209: The client 21 generates a gain value adjustment command according to the indication information input by the user, and sends the gain value adjustment command to the bias module 33.

Step 210, the bias module 33 forwards the gain value adjustment command to the identification module 36. Step 211: After the identification module 36 recognizes that it is a gain value adjustment command, it forwards it to the adjustment module 32.

Step 212: The adjustment module 32 adjusts the gain value of the power amplification module 31 to P according to the gain value adjustment command.

Step 213, the user inputs the instruction information for turning off the switch 5 to the client 21, and then the switch 5 is controlled to be disconnected by the same flow as steps 202-204.

As shown in FIG. 11, a flowchart of an embodiment of a method for setting a gain value of a tower amplifier according to the present invention includes the following steps: Step 301: The user inputs to the control device 8 the indication information that the switch 5 provided between the upstream signal input end and the downlink signal output end of the feeder 2 is closed.

Step 302: The control device 8 generates a closing control command according to the indication information input by the user, and controls the switch 5 to close, so that the base station 1 and the feeder 2 form a loop.

Step 303, the voltage measuring device 7 measures the terminal voltage value V between the upstream signal output end and the downstream signal input end of the feeder in the loop and sends it to the computing device 10, and the current measuring device 6 measures the current value I in the loop and transmits To the computing device 10.

Step 304, the computing device 10 obtains the resistivity of the pre-stored feeder from the storage device 9, and combines the voltage value V and the current value I to calculate the base station and the tower amplifier from the "L".

twenty one *

The length L of the feeder that transmits the upstream signal.

Step 305, the user selects the gain value of the power amplification module in the uplink channel of the tower amplifier 3 according to the length L, so that the gain of the tower amplifier 3 to the uplink signal is equivalent to the loss of the feeder, and accurately compensates the power of the feeder to the uplink signal. Loss, which prevents the gain value from being set too high, causes new noise and power consumption to increase, ensures the stability of the tower amplifier, and avoids the compensation effect on the uplink signal loss due to the too low gain setting.

Step 306, the user sets the gain value of the power amplification module in the uplink channel of the tower amplifier 3 to Q through the base station 1.

The general beneficial technical effects of the embodiments of the present invention:

By closing the switch set in the base station system, the ^^ station and the feeder form a loop, and the accurate measurement of the length of the feeder is realized according to the terminal voltage value and the current value of the loop and the resistivity of the feeder; the control device or the control module is used to control the closing of the switch And disconnected, the automatic measurement of the length of the feeder is realized; according to the length, the gain value of the tower amplifier is accurately set, so that the gain of the tower amplifier to the uplink signal is equivalent to the loss of the feeder, and the loss of the signal power of the feeder is accurately compensated. As shown in Table 2 below, the noise figure when the tower amplifier is not set in the base station system (ie, no gain), the noise figure of the tower amplifier is fixed at 12 dB, and the noise value and the gain value are related to the loss of the uplink signal by the feeder. Noise figure when changing:

Table 2 Noise system of the base station system

As can be seen from the above Table 2, when the feeder line is longer than when the tower amplifier is not provided in the base station system, that is, when the feeder loss is large, the noise coefficient of the base station system whose gain value changes is small under the condition that the feeder loss is the same. The system sensitivity is higher. Compared with the base station system with a fixed gain value of 12 dB, when the feeder length increases and the feeder loss increases, the noise coefficient of the base station system with a change in gain value is small, and the system reliability is high. As the length of the feeder increases, its loss Increasing, the noise figure of the base station system also increases. By means of the base station system provided by the invention, the length of the feeder can be accurately measured, so that the gain value of the tower amplifier in the base station system can be reasonably set, and the gain is matched with the length of the feeder line, so that the base station can correctly identify the uplink signal sent by the terminal. It is also possible to keep the noise figure to a minimum, thereby ensuring the sensitivity and reliability of the base station system.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

A base station system, comprising a base station, a feeder, a tower amplifier, and an antenna, further comprising:

2. The base station system according to claim 1, further comprising: a current measuring device, configured to: when the uplink signal input end and the downlink signal output end are in a connected state, the measurement is performed by the a current value of a loop formed by the base station and the feeder;

a voltage measuring device, configured to measure a voltage value between the uplink signal output end and the downlink signal input end in the loop when a connection state between the uplink signal input end and the downlink signal output end of the feeder line is .

3. The base station system according to claim 2, further comprising: control means for controlling the switch to be in a closed or open state.

The base station system according to claim 2 or 3, further comprising: a storage device, configured to store a resistivity of the feeder;

And a calculating device, configured to calculate the length of the feeder according to a resistivity of the feeder, a current value of the loop, and a voltage value.

The base station system according to any one of claims 1 to 4, characterized in that the switch is provided in the tower amplifier.

A tower-top amplifier, comprising: an uplink channel and a downlink channel, and an adjustment module for adjusting a gain value of the power amplification module in the uplink channel, further comprising:

a switch, configured to be between the downlink channel input end and the uplink channel output end Connected or disconnected.

The tower amplifier according to claim 6, further comprising: a biasing module, configured to send an uplink signal sent to the output end of the uplink channel, a downlink signal sent to the input end of the downlink channel, and send Deviating the gain value adjustment command to the adjustment module;

a coupling module, configured to separate an uplink signal sent to the uplink channel input end from a downlink signal sent to the downlink channel output end, and attenuate a downlink signal leaking to the uplink channel and an uplink signal leaking to the downlink channel .

8. The tower amplifier according to claim 7, wherein the switch is located before or in the bias module.

9. The tower amplifier according to claim 7, further comprising: a control module, configured to control the switch to be in a closed or open state.

The tower amplifier according to claim 9, further comprising: an identification module, configured to identify information sent by the bias module, and send a switch control command to the control module, to obtain the gain A value adjustment command is sent to the adjustment module.

The tower amplifier according to any one of claims 6 to 10, wherein the uplink channel and the downlink channel and the switch are one or more.

12. A base station, comprising:

Client, used to generate a switch control command that controls the switch to be in a closed or open state.

13. A method for measuring a length of a feeder, characterized in that it comprises:

Determining, according to the voltage value, the current value, and a pre-stored resistivity of the feeder Calculating the length of the feeder according to two, wherein V is a voltage value between the uplink signal output end and the downlink signal input end in the loop, where I is a current value in the loop, and is a resistivity of the feed line .

The method for measuring a length of a feeder according to claim 13, wherein the switch disposed between the upstream signal input end and the downstream signal output end of the feeder comprises:

Manually closing the switch disposed between the upstream signal input end and the downlink signal output end of the feeder;

Alternatively, the switch disposed between the upstream signal input end and the downstream signal output end of the feeder is closed according to the received switch control command.

The feeder length measuring method according to claim 14, wherein the control command is an antenna interface standard group AISG command.

The method for measuring the length of the feeder line according to claim 15, wherein the format of the control command is: OxFF<LengthLowByte> <LengthHighByte> <VendorID>; wherein the OxFF is a specification defined by the command identifier Command ID. The command is that the LengthLowByte is a low byte length, the LengthHighByte is a high byte length, and the VendorlD is a hardware manufacturer identifier.

The feeder length measuring method according to claim 16, wherein the format of the control command of the closed switch is: OxFF 0x01 0x01 <Vendor ID>.

18. A method of setting a gain value of a tower top amplifier, comprising: closing a switch disposed between an upstream signal input end and a downlink signal output end of the feeder line to form a loop between the base station and the feeder line;

Measuring a voltage value between the uplink signal output end and the downlink signal input end in the loop and a current value of the loop; Calculating a feeder length for transmitting an uplink signal between the base station and the tower amplifier according to the voltage value, the current value, and a pre-stored resistivity of the feeder;

The method for setting a gain value of a tower amplifier according to claim 18, wherein the setting the gain value of the tower amplifier according to the length of the feeder line comprises: setting the gain value to be the length The loss of the feeder is equivalent.