CN102761380B - Determining method of link loss value and radio remote unit (RRU) - Google Patents

Abstract

The invention discloses a method for determining a link loss value and a remote radio unit, which are used to solve the problem that more resources are consumed in link loss value testing by using the link loss value testing method provided in the prior art. The method includes: the radio remote unit RRU determines from the radio frequency ports contained in itself, the first radio frequency port whose working mode is set to transmit test mode and the second radio frequency port whose working mode is set to receive test mode; RRU generates the first signal , and send the first signal through the first radio frequency port; and the RRU detects the second signal received by the second radio frequency port from the first communication link to be tested between the first radio frequency port and the second radio frequency port; and according to the first signal and the second signal to determine a first loss value of the first communication link to be tested.

Description

Determination method of link loss value and remote radio unit

technical field

The invention relates to the field of communication technology, in particular to a method for determining a link loss value and a remote radio unit.

Background technique

With the development of the Long Term Evolution (LTE, Long Term Evolution) system, the LTE system will gradually adopt a dual-channel approach in terms of indoor coverage, that is, two antennas are arranged at one coverage point, and the signal sent by the signal source can be transmitted through two independent channels. The signal channel of the signal is transmitted to these two antennas independently. A schematic diagram of a dual-channel indoor coverage method is shown in FIG. 1 . Among them, the signal transmitted by one channel is sent by the TD-S/TD-L dual-mode radio remote unit (RRU, Radio Remote Unit) connected to the indoor baseband processing unit (BBU, Building Base band Unit), and transmitted through the coupler , After being processed by the power divider, it is finally transmitted to the single-polarized ceiling antenna; while the signal transmitted by the other channel is the combined signal obtained by combining the signal sent by the RRU and the signal sent by other signal sources through the combiner. The combined signal is finally transmitted to the single-polarized ceiling antenna after being processed by a coupler and a power divider.

For the dual-channel indoor coverage method shown in Figure 1, the signal sent by the RRU transmitted by one of the channels needs to be combined with the signal sent by other signal sources (such as signals in GSM and TD-SCDMA systems) , therefore, the link loss values of the two channels are often different, resulting in link imbalance. Since link imbalance will have a negative impact on system performance, the two links need to be calibrated so that their link loss values are calibrated to be the same or relatively similar.

The premise of realizing the accurate calibration of the link is the accurate test of the link loss value. In the prior art, in order to test the link loss value, the signal source is generally used in combination with the spectrum analyzer, that is, one end of the link to be tested is connected to the signal source, and the other end is connected to the spectrum analyzer, so that the spectrum analyzer is used to realize the connection between the signal source and the spectrum analyzer. Test the loss value of a link between them. The disadvantage of such a test scheme is that, on the one hand, a special spectrum analyzer needs to be introduced for testing, which consumes more resources; on the other hand, when testing the loss value of the link, not only the loss value of the downlink must be considered (that is, the link loss value when the above-mentioned antenna is used as a receiving antenna), and the loss value of the uplink (that is, the link loss value when the above-mentioned antenna is used as a transmitting antenna)), therefore, for the above two links, the spectrum When the instrument tests the loss value of its uplink and downlink, there are actually 4 connection methods, and in order to complete the test of the link loss value, it is necessary to complete the 4 different connection methods between devices and compare them. consumes resources.

Contents of the invention

Embodiments of the present invention provide a method for determining a link loss value and a remote radio unit to solve the problem that a link loss value test using a link loss value test method provided in the prior art consumes a lot of resources.

Embodiments of the present invention adopt the following technical solutions:

A method for determining a link loss value, comprising:

The remote radio unit RRU determines from the radio frequency ports contained in itself that the working mode is set to the first radio frequency port of the transmission test mode and the second radio frequency port whose working mode is set to the receiving test mode; the RRU generates the first signal, and passes The first radio frequency port sends a first signal; and the RRU detects a second signal received by the second radio frequency port from the first communication link to be tested between the first radio frequency port and the second radio frequency port; and according to the first signal and the second radio frequency port The second signal is used to determine a first loss value of the first communication link to be tested.

Preferably, after the RRU determines the first loss value, it also includes: the RRU sets the working mode of the first radio frequency port to the receiving test mode, and sets the working mode of the second radio frequency port to the transmitting test mode; the RRU generates the first signal, and send the first signal through the second radio frequency port; and the RRU detects the third signal received by the first radio frequency port from the first communication link to be tested; and according to the first signal and the third signal, determine the A second loss value of the first communication link to be tested.

Preferably, the method further includes: determining the difference between the uplink and downlink losses of the first communication link to be tested according to the first loss value and the second loss value.

Preferably, after the RRU determines the first loss value, it further includes: the RRU generates the first signal, and sends the first signal through the first radio frequency port; and the RRU detects the connection between the first radio frequency port and the second radio frequency A fourth signal received by the second communication link to be tested between the ports; and determining a loss value of the second communication link to be tested according to the first signal and the fourth signal.

Preferably, the method further includes: determining the loss value of the first communication link to be tested and the loss value of the second communication link to be tested according to the first loss value and the loss value of the second communication link to be tested. The difference in the loss value.

A remote radio unit, comprising:

The radio frequency port determination module is used to determine the first radio frequency port whose working mode is set to transmit test mode and the second radio frequency port whose working mode is set to receive test mode from the radio frequency ports included in the radio remote unit; signal The sending module is used to generate the first signal, and sends the first signal through the first radio frequency port determined by the radio frequency port determination module; the signal detection module is used to detect the second radio frequency port determined by the radio frequency port determination module from the first radio frequency port and The second signal received by the first communication link to be tested between the second radio frequency ports; the loss value determination module is used to determine the second signal according to the first signal sent by the signal sending module and the second signal detected by the signal detection module A first loss value of the communication link to be tested.

The beneficial effects of the embodiments of the present invention are as follows:

In the solution provided by the embodiment of the present invention, by setting the RRU radio frequency port, the RRU can be set as a signal source, and can also be used as a test device for receiving signals and performing loss value tests, so that there is no need to introduce additional spectrum analyzers for testing, saving resources required for testing.

Description of drawings

Figure 1 is a schematic diagram of a dual-channel indoor coverage method;

FIG. 2 is a schematic flowchart of a method for determining a link loss value provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of two links in a dual-channel indoor coverage mode;

Figure 4a is a schematic diagram of the calibration topology constructed for the calibration of link 1;

Figure 4b is a schematic diagram of the calibration topology constructed for the calibration of link 2;

Fig. 5 is the schematic diagram of the working mode of the radio frequency port of RRU;

FIG. 6 is a schematic diagram of a specific implementation process for performing a link loss value test using the link loss value determination scheme provided by the embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an apparatus for determining a link loss value provided by an embodiment of the present invention.

Detailed ways

In order to solve the problem that using the link loss value test method provided by the prior art will consume more resources, the embodiment of the present invention provides a link loss value determination scheme. The setting of the RRU can be set as a signal source, and can also be used as a test device for receiving signals and performing loss value tests, so that there is no need to introduce additional spectrum analyzers for testing, saving the resources required for testing.

The solution for determining the link loss value provided by the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Embodiments of the present invention firstly provide a method for determining a link loss value. The specific flowchart of the method is shown in FIG. 2 , including the following steps:

Step 21, the RRU determines from the radio frequency ports contained in itself, the first radio frequency port whose working mode is set as the transmitting test mode and the second radio frequency port whose working mode is set as the receiving test mode;

Step 22, the RRU generates a first signal, and sends the first signal through the first radio frequency port;

Step 23, the RRU detects the second signal received by the second radio frequency port from the first communication link to be tested between the first radio frequency port and the second radio frequency port;

Step 24: Determine a first loss value of the first communication link to be tested according to the first signal and the second signal.

If the transmission of the first signal to the second radio frequency port via the first radio frequency port is regarded as "downlink transmission", then the first loss value obtained through the test in step 24 is the downlink loss value of the first communication link to be tested. Correspondingly, if you want to further test the corresponding uplink loss value on the basis of testing the above first loss value, you can implement the following steps:

First, the RRU sets the operating mode of the first radio frequency port to receive test mode, and sets the operating mode of the second radio frequency port to transmit test mode;

Then, the RRU generates the first signal, and sends the first signal through the second radio frequency port;

The RRU detects a third signal received by the first radio frequency port from the first communication link to be tested;

Finally, the RRU determines the second loss value of the first communication link to be tested according to the first signal and the third signal.

Through the above steps, the working mode of the first radio frequency port is set to the receiving test mode, and the working mode of the second radio frequency port is set to the transmitting test mode, so that the transmission and diagram in the first communication link to be tested can be easily realized. The signals in the process shown in 1 flow to opposite signals, and there is no need to make any changes to the connection relationship between the communication link and the RRU.

Preferably, after the first loss value and the second loss value are determined, the uplink and downlink loss values of the first communication link to be tested can be determined by calculating the difference between the first loss value and the second loss value.

In addition, based on the above solution provided by the embodiment of the present application, after the first communication link to be tested is tested, when the communication link to be tested is changed from the first communication link to be tested to the second communication link to be tested , the following steps can also be further performed to realize the test of the loss value of the second communication link to be tested:

First, the RRU generates a first signal, and sends the first signal through a first radio frequency port;

Then, the RRU detects a fourth signal received by the second radio frequency port from the second communication link to be tested between the first radio frequency port and the second radio frequency port;

Finally, the RRU determines a second loss value of the second communication link to be tested according to the first signal and the fourth signal.

In the embodiment of the present invention, after the first loss value and the second loss value of the second communication link to be tested are determined, the first loss value of the first communication link to be tested and the second loss value of the second communication link to be tested may be determined further The difference in the second loss value of the test communication link. According to the difference of the loss value, subsequent link calibration can be realized, and the loss value of the first communication link to be tested is calibrated to be the same or similar to the loss value of the second communication link to be tested.

In addition, for the second communication link to be tested, after the first loss value of the first communication link to be tested is determined, the first signal can be sent by the first radio frequency port and the signal is received by the second radio frequency port. mode, the signal received by the second radio frequency port from the second communication link to be tested is detected through the similar steps above, so as to determine the first loss value of the second communication link to be tested.

Based on the first and second loss values of the second communication link to be tested, the difference between uplink and downlink loss of the second communication link to be tested can be determined.

It should be noted that, for the first and second communication links to be tested, the embodiment of the present invention does not limit the sequence of performing the uplink and downlink tests. For example, if the signal direction in which the first radio frequency port sends a signal and the second radio frequency port receives a signal is used as the "uplink" direction, and the opposite direction is used as the "downlink" direction, then the first communication link to be tested can be first tested. After the uplink and downlink tests, the uplink and downlink tests are performed on the second communication link to be tested. It is also possible to respectively perform downlink tests on the first and second communication links to be tested after performing uplink tests on the first and second communication links to be tested. Wherein, the embodiment of the present invention does not limit the order of the uplink and downlink tests, for example, for the same communication link to be tested, the uplink test can be performed first, and then the downlink test can be performed; vice versa.

In addition, it should be noted that in the above solutions provided by the embodiments of the present invention, among the first and second communication links to be tested, only one link may include a combiner and a source device different from the above RRU. Such a situation is especially applicable to the actual scenario introduced in the background of the present invention.

By adopting the above solution provided by the embodiment of the present invention, while the RRU can be set as the signal source, it can also be set as the test device to realize the signal reception and loss value test, so that there is no need to introduce an additional spectrum analyzer for testing, saving Resources required for testing. In addition, when testing the uplink and downlink signal transmission processes on the same link, it is not necessary to re-adjust the connection relationship, but only need to reset the working mode of the RRU radio frequency port. Compared with the method of testing the downlink transmission process, the solution provided by the embodiment of the present invention can realize the convenient and simple test of the loss value of the link.

The specific implementation process of the solution will be described in detail below by taking the actual application process of the above solution provided by the embodiment of the present invention as an example.

In practical applications, the analysis of the dual-channel method shown in Figure 1 shows that the difference between the two links mainly occurs at the source end as shown in Figure 3, while the two links (in Figure 3 The remote ends of link 1 and link 2) are the same regardless of the slave device or the cable. Therefore, when performing link calibration, it is only necessary to calibrate a segment of the link where the source end is located.

When calibrating the links where the source ends of links 1 and 2 are located, it is first necessary to construct a corresponding calibration topology.

For the calibration of Link 1, the constructed calibration topology is shown in Figure 4a. In Fig. 4a, one end of a section of cable including the signal source end but not the remote end in link 1 is connected to the A radio frequency port of the RRU, and the other end is connected to the B radio frequency port of the RRU.

Similarly, for the calibration of link 2, the constructed calibration topology is shown in Figure 4b. In Fig. 4b, one end of a section of cable including the signal source end but not the remote end in link 2 is connected to the A radio frequency port of the RRU, and the other end is connected to the B radio frequency port of the RRU.

Based on the calibration topology shown in Fig. 4a and Fig. 4b, the further operation needs to set the working mode of the radio frequency port of the RRU. A schematic diagram of a working mode of a radio frequency port of the RRU is shown in FIG. 5 . As can be seen from Figure 5, taking the A radio frequency port and the B radio frequency port as an example, they are respectively connected to the digital processing part of the RRU (the digital processing part can be regarded as the CPU of the RRU), and each includes three working modes, respectively These are normal mode, transmit test mode and receive test mode. The normal mode, transmission test mode and reception test mode of A radio frequency port can be controlled by switches a1, a2 and a3 respectively; the normal mode, transmission test mode and reception test mode of B radio frequency port can be controlled by switches b1, b2 and b3 respectively to control. In the embodiment of the present invention, the states of the above-mentioned switches can be controlled by the software running in the RRU, so that a signal can be sent from the radio frequency port A to the radio frequency port B, or a signal can be sent from the radio frequency port B to the radio frequency port A.

Based on the calibration topology shown in Figure 4a and Figure 4b and the above-mentioned setting method for the radio frequency port working mode, a specific test flow diagram of the link loss value is shown in Figure 6, including the following steps:

Step 61, setting the RRU to run in the test mode;

Setting the RRU to run in the test mode is equivalent to performing the operation of setting the transmit test mode and receive test mode of the A radio frequency port to a settable state;

Step 62, for link 1, based on the calibration topology as shown in Figure 4a, according to the expected flow direction of the signal in link 1 (assuming that the expected signal flow direction is from the A radio frequency port to the B radio frequency port, and the signal will flow from the A radio frequency port to the B radio frequency port. The direction in which the radio frequency port sends the signal to the B radio frequency port is the downlink direction of the signal), by setting a2 to the closed state, the A radio frequency port works in the transmission test mode, and by setting b3 to the closed state, the B radio frequency port works in the In receive test mode;

Step 63 , the RRU generates a test signal and sends it through the A radio frequency port, wherein the test signal sent through the A radio frequency port will be transmitted to the B radio frequency port through the link 1 .

Step 64, the RRU obtains the signal received through the B radio frequency port, and determines the downlink loss value D of link ₁ according to the strength value of the test signal sent by the A radio frequency port and the strength value of the signal received by the B radio frequency port _downlink ;

Step 65, determine the uplink loss value D _1-uplink of link 1 in a manner similar to the above steps 62 to 64;

Step 66, according to the determined D _1-downlink and D _1-uplink of link 1, determine the uplink and downlink loss difference of link 1, that is, D _1-uplink -D _1-downlink ;

It should be noted that the D _1-uplink -D _1-downlink determined here can be used to determine whether there is a fault in the link connection of the link 1 . Because in theory, when there is no fault in the link connection of link 1, D _1-uplink should be equal to D _1-downlink , or when there is no major fault in the link connection of link 1, D _1-uplink and D _{1 -downlink} should be similar. And when D _1-uplink -D _1-downlink is a large value, it is very likely that the link connection is faulty, for example, some devices in link 1 (such as a circulator) may have a wrong connection problem. Therefore, according to D _1-uplink -D _1-downlink , fault detection on link 1 can be realized.

Step 67, for link 2, based on the calibration topology shown in Figure 4b, according to the expected flow direction of the signal in link 1, set the A radio frequency port to work in the transmit test mode, and set the B radio frequency port to work in the receive test mode mode;

Step 68, the RRU generates a test signal and sends it through the A radio frequency port, wherein the test signal sent through the A radio frequency port will be transmitted to the B radio frequency port through the link 2;

Step 69, the RRU obtains the signal received through the radio frequency port B, and determines the downlink loss value D of link 2 according to the strength value of the test signal sent by the radio frequency port A and the signal strength value received by the radio frequency port _{B. downlink} ;

Step 610, determine the uplink loss value D _2-uplink of link 2 in a manner similar to the above steps 67 to 69;

Step 611, according to the determined D _2-downlink and D _2-uplink of link 2, determine the uplink and downlink loss difference of link 2, that is, D _2-uplink -D _2-downlink ;

Step 612, according to the determined D _1-uplink , D _1-downlink , D _2-uplink and D _2-downlink , determine the difference between the downlink loss values of link 1 and link 2, that is, D _1-downlink -D _{2- downlink} , and determine the uplink loss difference between link 1 and link 2, that is, D _1-uplink -D _2-uplink ;

Step 613: Calibrate Link 1 and/or Link 2 according to the determined D _1-downlink -D _2-downlink and D _1-uplink -D _2-uplink . Since link 1 and/or link 2 can be calibrated according to the difference between uplink loss and downlink loss of link 1 and link 2 in a common way in the prior art, this part of the content will not be described in detail in this embodiment of the present invention.

Correspondingly, the embodiment of the present invention also provides an RRU. The specific structure of the RRU is shown in FIG. 7 , including the following functional modules:

The radio frequency port determination module 71 is used to determine the first radio frequency port whose working mode is set to the transmission test mode and the second radio frequency port whose working mode is set to the receiving test mode from the radio frequency ports included in the radio remote unit;

A signal sending module 72, configured to generate a first signal, and send the first signal through the first radio frequency port determined by the radio frequency port determination module 71;

A signal detection module 73, configured to detect a second signal received by the second radio frequency port determined by the radio frequency port determination module 71 from the first communication link to be tested between the first radio frequency port and the second radio frequency port;

The loss value determining module 74 is configured to determine a first loss value of the first communication link to be tested according to the first signal sent by the signal sending module 72 and the second signal detected by the signal detecting module 73 .

Based on the above-mentioned RRU provided by the embodiment of the present invention, when it is necessary to change the flow direction of the first signal in the first communication link to be tested, the above-mentioned RRU may further include a setting module. The function of the setting module is to set the working mode of the first radio frequency port as receiving test mode and the working mode of the second radio frequency port as transmitting test mode after the loss value determining module 74 determines the first loss value. Further, after the setting module executes the above settings, the signal sending module 72 can be further used to send the first signal through the second radio frequency port; The third signal received; the loss value determination module 74 is also used to determine the second loss value of the first communication link to be tested according to the first signal sent by the signal sending module 72 and the third signal detected by the signal detection module 73 .

Based on the first loss value and the second loss value determined by the loss value determination module 74, the above-mentioned RRU provided by the embodiment of the present invention may further include a loss difference determination module, which is used to determine 74 the first loss according to the loss value determination module value and the second loss value to determine the difference between uplink and downlink losses of the first communication link to be tested.

Preferably, the signal sending module 72 is further configured to send the first signal through the first radio frequency port determined by the radio frequency port determination module after the loss value determination module 74 determines the second loss value;

The above signal detection module 73 is also used to detect the fourth signal received by the second radio frequency port determined by the radio frequency port determination module from the second communication link to be tested between the first radio frequency port and the second radio frequency port;

The loss value determination module 74 is further configured to determine the second loss value of the second communication link to be tested according to the first signal sent by the signal sending module 72 and the fourth signal detected by the signal detection module 73 .

Preferably, the RRU provided by the embodiment of the present invention may also include a loss difference determination module for determining the difference between a loss value determined by the loss value determination module 74 and a second loss value of the second communication link to be tested .

In addition, when the link to be tested is changed from the first link to be tested to the second link to be tested, the above-mentioned signal sending module 72 is also used to pass the first radio frequency port after the loss value determination module 74 determines the first loss value. Send the first signal; the signal detection module 73 is also used to detect the fifth signal that the second radio frequency port receives from the second communication link to be tested between the first radio frequency port and the second radio frequency port; the loss value determination module 74 then It is also used to determine the first loss value of the second communication link to be tested according to the first signal sent by the signal sending module 72 and the fifth signal detected by the signal detection module 73 .

Preferably, the RRU provided by the embodiment of the present invention may further include a loss difference determination module, which is used to determine the first loss value and the first loss value of the first communication link to be tested according to the loss value determination module 74. A first loss value of the second communication link to be tested, determining a difference between the first loss value of the first communication link to be tested and the first loss value of the second communication link to be tested.

Preferably, the RRU provided in the embodiment of the present invention may include:

Setting module, for determining the first loss value of the second communication link to be tested after the loss value determination module 74, the working mode of the first radio frequency port is set to receive test mode, the working mode of the second radio frequency port is set to launch test mode;

Therefore, the signal sending module 72 can also be used to send the first signal through the second radio frequency port;

The signal detection module 73 can also be used to detect the fourth signal received by the first radio frequency port from the second communication link to be tested;

The loss value determining module 74 may also be configured to determine a second loss value of the second communication link to be tested according to the first signal sent by the signal sending module 72 and the fourth signal detected by the signal detecting module 73 .

Preferably, the loss difference determination module included in the RRU can also be used to determine the uplink and downlink of the second communication link to be tested according to the first and second loss values of the second communication link to be tested determined by the loss value determination module. loss difference.

Preferably, among the first and second communication links to be tested, only one link may include a combiner and a source device different from the RRU.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (20)

1. A method for determining a link loss value, comprising: The radio remote unit RRU determines from the radio frequency ports contained in itself that the working mode is set to the first radio frequency port of the transmitting test mode and the working mode is set to the second radio frequency port of the receiving test mode; The RRU generates a first signal and sends the first signal through the first radio frequency port; and The RRU detects a second signal received by the second radio frequency port from the first communication link to be tested between the first radio frequency port and the second radio frequency port; and A first loss value of the first communication link to be tested is determined according to the first signal and the second signal. 2. The method according to claim 1, wherein after the RRU determines the first loss value, further comprising: The RRU sets the working mode of the first radio frequency port to receive test mode, and sets the working mode of the second radio frequency port to transmit test mode; The RRU generates a first signal and sends the first signal through the second radio frequency port; and The RRU detects a third signal received by the first radio frequency port from the first communication link to be tested; and A second loss value of the first communication link to be tested is determined according to the first signal and the third signal sent through the second radio frequency port. 3. The method of claim 2, further comprising: According to the first loss value and the second loss value, determine an uplink and downlink loss difference of the first communication link to be tested. 4. The method according to claim 2, wherein after determining the second loss value, further comprising: The RRU generates a first signal and sends the first signal through the second radio frequency port; and The RRU detects a fourth signal received by the first radio frequency port from the second communication link to be tested; and A second loss value of the second communication link to be tested is determined according to the first signal and the fourth signal sent through the second radio frequency port. 5. The method of claim 4, further comprising: A difference between the first loss value and a second loss value of the second communication link under test is determined. 6. The method according to claim 1, wherein after the RRU determines the first loss value, further comprising: The RRU generates a first signal and sends the first signal through the first radio frequency port; and The RRU detects a fifth signal received by the second radio frequency port from the second communication link to be tested between the first radio frequency port and the second radio frequency port; and A first loss value of the second communication link to be tested is determined according to the first signal and the fifth signal. 7. The method of claim 6, further comprising: A difference between a first loss value of the first communication link under test and a first loss value of the second communication link under test is determined. 8. The method according to claim 6, wherein, after the RRU determines the first loss value of the second communication link to be tested, it further comprises: The RRU sets the working mode of the first radio frequency port to receive test mode, and sets the working mode of the second radio frequency port to transmit test mode; The RRU generates a first signal and sends the first signal through the second radio frequency port; and The RRU detects a fourth signal received by the first radio frequency port from the second communication link to be tested; and A second loss value of the second communication link to be tested is determined according to the first signal and the fourth signal sent through the second radio frequency port. 9. The method according to claim 8, characterized in that, according to the first and second loss values of the second communication link to be tested, the uplink and downlink loss difference of the second communication link to be tested is determined . 10. The method according to any one of claims 4 to 9, wherein, among the first and second communication links to be tested, only one link includes a combiner and a signal source different from the RRU equipment. 11. A radio remote unit, characterized in that it comprises: A radio frequency port determination module, configured to determine, from the radio frequency ports contained in the remote radio unit, the first radio frequency port whose working mode is set to the transmitting test mode and the second radio frequency port whose working mode is set to the receiving test mode; A signal sending module, configured to generate a first signal, and send the first signal through the first radio frequency port determined by the radio frequency port determination module; A signal detection module, configured to detect a second signal received by the second radio frequency port determined by the radio frequency port determination module from the first communication link to be tested between the first radio frequency port and the second radio frequency port; The loss value determination module is configured to determine the first loss value of the first communication link to be tested according to the first signal sent by the signal sending module and the second signal detected by the signal detection module. 12. The radio remote unit according to claim 11, further comprising: The setting module is used to set the working mode of the first radio frequency port as the receiving test mode, and set the working mode of the second radio frequency port as the transmitting test mode after the loss value determining module determines the first loss value; and The signal sending module is also used to send the first signal through the second radio frequency port; The signal detection module is also used to detect a third signal received by the first radio frequency port from the first communication link to be tested; The loss value determination module is further configured to determine the first signal of the first communication link to be tested according to the first signal sent by the signal sending module through the second radio frequency port and the third signal detected by the signal detection module. Second loss value. 13. The radio remote unit according to claim 12, further comprising: The loss difference determination module is configured to determine the uplink and downlink loss difference of the first communication link to be tested according to the first loss value and the second loss value determined by the loss value determination module. 14. The radio remote unit according to claim 12, characterized in that: The signal sending module is further configured to send the first signal through the second radio frequency port determined by the radio frequency port determination module after the loss value determination module determines the second loss value; The signal detection module is also used to detect the fourth signal received by the first radio frequency port determined by the radio frequency port determination module from the second communication link to be tested between the first radio frequency port and the second radio frequency port; The loss value determination module is further configured to determine a second loss value of the second communication link to be tested according to the first signal sent by the signal sending module through the second radio frequency port and the fourth signal detected by the signal detection module. 15. The radio remote unit according to claim 14, further comprising: A loss difference determination module, configured to determine a difference between the first loss value determined by the loss value determination module and the second loss value of the second communication link to be tested. 16. The radio remote unit according to claim 11, characterized in that, The signal sending module is further configured to send the first signal through the first radio frequency port after the loss value determining module determines the first loss value; The signal detection module is also used to detect a fifth signal received by the second radio frequency port from the second communication link to be tested between the first radio frequency port and the second radio frequency port; The loss value determination module is further configured to determine the first signal of the second communication link to be tested according to the first signal sent by the signal sending module through the second radio frequency port and the fifth signal detected by the signal detection module. a loss value. 17. The radio remote unit according to claim 16, further comprising: A loss difference determination module, configured to determine the difference between the first loss value of the first communication link to be tested determined by the loss value determination module and the first loss value of the second communication link to be tested. 18. The radio remote unit according to claim 16, further comprising: The setting module is used to set the working mode of the first radio frequency port to receive test mode after the loss value determining module determines the first loss value of the second communication link to be tested, and set the working mode of the second radio frequency port to is the launch test mode; and The signal sending module is also used to send the first signal through the second radio frequency port; The signal detection module is also used to detect a fourth signal received by the first radio frequency port from the second communication link to be tested; The loss value determination module is further configured to determine the first signal of the second communication link to be tested according to the first signal sent by the signal sending module through the second radio frequency port and the fourth signal detected by the signal detection module. Second loss value. 19. The radio remote unit according to claim 18, characterized in that: The loss difference determination module is further configured to determine the upper and lower values of the second communication link to be tested according to the first and second loss values of the second communication link to be tested determined by the loss value determination module. Row loss difference. 20. The radio remote unit according to any one of claims 14 to 19, wherein, among the first and second communication links to be tested, only one link includes a combiner and a signal different from the RRU. source device.