WO2012003682A1

WO2012003682A1 - Method and system for antenna calibration based on time division duplexing coordinated multi-point transmission

Info

Publication number: WO2012003682A1
Application number: PCT/CN2010/078042
Authority: WO
Inventors: 陈霖; 禹忠; 郭阳; 支周
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-06
Filing date: 2010-10-22
Publication date: 2012-01-12
Also published as: CN102315866A; CN102315866B

Abstract

A method for antenna calibration based on Time Division Duplexing (TDD) coordinated multi-point transmission is disclosed, which includes: the base station judges that antennas of a cell are necessary to be calibrated, then calibrates the multiple antennas of the cell; the adjacent cell judges that the calibration parameters of the cell are necessary to be obtained, then returns the judging result to the cell; the cell sends the calibration parameters to the adjacent cell after the calibration is finished, the adjacent cell calibrates its antennas according to the calibration parameters from the cell. A system for antenna calibration based on TDD coordinated multi-point transmission is also correspondingly disclosed. With the present invention, if the case of a cell whose antennas are necessary to be calibrated is similar with the case of the adjacent cell, then the adjacent cell can wait until the calibration of the cell is finished and calibrates its antennas according to the calibration parameters of the cell, so more additional resources are saved with the validity of the Sounding Reference Signal (SRS) feedback being ensured and the feedback precision being improved.

Description

Antenna correction method and system based on TDD multi-point cooperative transmission

The present invention relates to a Coordinated Multi-Point (CoMP) transmission technology, and more particularly to an antenna correction method and system based on Time Division Duplexing (TDD) multi-point coordinated transmission. Background technique

LTE-A is the latest generation of wireless communication standards developed and developed by the International Standards Organization's 3rd Generation Partnership Project (3GPP). It is a further development and evolution of the LTE (Long Term Evolution) series of communication standards. CoMP is an important technology to be adopted in LTE-A. This technology can improve the performance of many different technical indicators by using multiple nodes for cooperative transmission/reception, such as improving peak transmission rate and enhancing coverage of cell edges. The most common working mode of CoMP is: When the user equipment (User Equipment, UE) is in the central area of the cell, the neighboring cell has small interference and good channel conditions. In this case, CoMP can work in the cooperative transmission mode. In order to get the highest data transmission rate for the UE. In this mode, multiple transmitting nodes in the cooperative set simultaneously transmit independent data streams to the terminal, and thus are a multi-node space division multiplexing mode. Compared with single-node space division multiplexing, space division multiplexing of multi-node cooperative transmission is better because of channel independence, so better multiplexing effect can be obtained.

In the traditional non-cooperative transmission scenario, when the UE is located at the cell edge, the receiving effect of the UE is poor, which is caused by the following two reasons: First, the transmitting signal of the cell experiences a long-distance decline, Without special power control, its strength is weak, which is equivalent to the signal strength of neighboring cells. Second, in the traditional non-cooperative mode, the UE receives signal interference from neighboring cells (in LTE-A). The frequency reuse factor for the small interval is 1). In the above case, if the beam forming (BF) mode of CoMP transmission is adopted, it can be avoided. Interference from neighboring cells, but also can be transformed into a treasure, enhancing signal coverage at the edge of the cell.

In this process, the UE needs to provide information feedback to the E-NodeB in time. This is because, under the premise of sufficient and timely information feedback, each node in the collaboration set can adjust and select the most appropriate information when communicating with each other. The way of working, for this reason, the information feedback mode of the UE has been fully studied in the 3GPP, mainly in the following three ways:

1) Explicit feedback

At this time, the UE feeds back the observed channel, and has not undergone any transformation and processing.

2) Implicit feedback

At this time, the UE feeds back a Channel Quality Indicator (CQI) or a Precoding Matrix Indicator (PMI) or a Channel Rank Indicator (RI).

3) Using the Sounding Reference Signal (SRS) feedback from the UE

This feedback is based on the uplink and downlink SRS signals, and the base station (E-NodeB) estimates the downlink channel. Systems that work in TDD mode can use this form of feedback.

Compared with the first feedback method and the second feedback method, the third feedback method makes full use of the electromagnetic reciprocity of the physical channel of the TDD system, and the feedback precision is high, and the additional resources required are small, so the above third feedback The way is the most ideal feedback method in the TDD system.

However, since the TDD system is only reciprocal to the physical channel and is affected by many factors such as temperature and path loss, the amplitude/phase of the RF link gain corresponding to each antenna may be misaligned, resulting in uplink and downlink RF links and antennas. The gain is different. In this case, the channel through which the entire signal flows is not reciprocal as a whole. Therefore, if the RF link and antenna gain are not corrected and compensated, the TDD system cannot directly use the SRS feedback.

However, the existing correction method mainly focuses on the gain correction problem between the uplink and the downlink of the RF link corresponding to one antenna or the gain correction problem between the independent array elements of the same array antenna, and there is no Antenna correction technology applied in TDD multi-point cooperative transmission. Summary of the invention

In view of this, the main object of the present invention is to provide an antenna correction method and system based on TDD multi-point coordinated transmission, which can correct multiple antennas in TDD multi-point coordinated transmission, thereby ensuring the effectiveness and improvement of SRS feedback. Feedback accuracy, saving additional resources.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

An antenna correction method based on TDD multi-point cooperative transmission, comprising:

In the TDD multi-point coordinated transmission scenario, the base station to which the cell belongs determines that the antenna of the cell needs to be corrected, and then the antenna in the cell is corrected;

The neighboring cell of the cell determines that the correction parameter of the cell needs to be acquired, and returns the determination result to the cell;

After the correction is completed, the cell sends a correction parameter to the neighboring cell, and the neighboring cell corrects the antenna according to the correction parameter from the cell.

When the base station to which the cell belongs determines that the antenna of the cell needs to be corrected, the method further includes: the base station notifying a neighboring cell of the cell, where the cell is to perform antenna correction.

The method further includes: querying, by the neighboring cell of the cell, an antenna correction condition of the cell;

The cell is performing antenna correction, and the neighboring cell is notified, and the cell is performing antenna correction.

If the cell has more than one antenna, the base station to which the cell belongs determines that the antenna of the cell needs to be corrected to: the base station to which the cell belongs acquires each antenna according to the situation that each antenna of the cell receives the sounding reference signal. Gain and/or phase of the RF link, after which the gain and/or phase of the RF link corresponding to each antenna of the cell are compared in pairs, and the difference between the obtained maximum comparison value and the minimum comparison value is greater than If the threshold is set, it is determined that antenna correction is required. The method further includes: the base station notifying a neighboring cell of the cell, where the cell is to perform antenna correction or performing antenna correction, and transmitting the maximum comparison value and the minimum comparison value to the neighboring cell.

The neighboring cell determines whether the calibration parameter of the cell needs to be acquired:

And obtaining, by the neighboring cell, a gain and/or a phase of a radio frequency link corresponding to each antenna according to a situation in which each antenna receives a sounding reference signal;

The adjacent 'j, the area compares the gain and/or the phase of the radio frequency link corresponding to each antenna, and obtains the maximum comparison value and the minimum comparison value in the comparison value;

The neighboring cell determines that the difference between the obtained maximum comparison value and the maximum comparison value sent by the cell is within a preset range, and the obtained minimum comparison value is the minimum comparison value sent by the cell. If the difference is within a preset range, it is determined that the correction parameter of the cell needs to be acquired; the difference between the obtained maximum comparison value and the maximum comparison value sent by the cell is outside a preset range, or And the difference between the obtained minimum comparison value and the minimum comparison value sent by the cell is outside a preset range, and determining that the correction parameter of the cell is not required to be acquired.

If the cell has one antenna, the base station to which the cell belongs determines that the antenna of the cell needs to be corrected as follows: If the total strength of the strength/signal channel of the cell antenna receiving the sounding reference signal is less than a preset threshold, it is determined that Correcting the antenna of the cell.

The method further includes: the base station notifying a neighboring cell of the cell, where the cell is to perform antenna correction or performing antenna correction, transmitting an intensity/signal channel total gain of the received sounding reference signal to the phase Neighboring cell.

The neighboring cell acquires a total gain/signal channel gain in which the antenna receives the sounding reference signal;

The neighboring cell determines that the difference between the obtained strength of the received sounding reference signal and the total gain of the signal channel and the total gain of the received sounding reference signal sent by the cell are at Within a preset range, determining that the correction parameter of the cell needs to be acquired; the obtained strength of the received sounding reference signal/the total gain of the signal channel and the strength of the received sounding reference signal sent by the cell/the total gain of the signal channel If the difference is outside the preset range, it is determined that the correction parameter of the cell does not need to be acquired.

Where the cell has more than one antenna, the base station corrects the antenna in the cell to:

The base station selects a reference antenna from multiple antennas of the cell;

The base station adjusts the gain and/or phase of the radio link corresponding to the antenna according to the gain and/or phase of the radio link corresponding to the reference antenna, and notifies the user equipment to enter the antenna correction mode;

The user equipment enters an antenna correction mode, and measures a gain and/or a phase of a radio frequency link corresponding to the antenna to be adjusted, and reports the gain and/or phase to the base station;

The base station determines that the antenna correction needs to be continued according to the gain and/or phase of the radio link corresponding to the antenna to be adjusted reported by the user equipment, and then performs antenna correction.

An antenna correction system based on TDD multi-point coordinated transmission includes: a first base station and a second base station; wherein

The first base station is configured to: when determining, in a TDD multi-point coordinated transmission scenario, that an antenna of a cell under the first base station needs to be corrected, correcting an antenna in the cell; and acquiring, in the second base station, When the cell is corrected, after the cell calibration ends, the correction parameter is sent to the second base station;

The second base station is a base station to which the neighboring cell of the cell belongs, and is used to determine whether the correction parameter of the cell needs to be acquired, and when it is determined that the correction parameter of the cell needs to be acquired, the judgment result is returned to the Determining a first base station; and correcting an antenna of the neighboring cell below it according to a correction parameter from the first base station.

The first base station is further configured to determine that an antenna of a cell under the first base station is required to enter When the line is corrected, the second base station is notified that the cell is to be subjected to antenna correction.

The second base station is further configured to query an antenna correction situation of the cell; the first base station is further configured to: when receiving an inquiry by the second base station, and the cell is performing antenna correction, Notifying the neighboring cell that the cell is undergoing antenna correction.

If the cell has more than one antenna, the first base station determines that the antenna of the cell under the first base station needs to be corrected to: obtain the radio frequency corresponding to each antenna according to the situation that each antenna of the cell receives the sounding reference signal The gain and/or phase of the link, after which the gain and/or phase of the corresponding RF link of the antenna are compared in pairs, and the difference between the obtained maximum comparison value and the minimum comparison value is greater than the preset value. The threshold determines that antenna correction is required.

The first base station is further configured to send the maximum comparison value and the minimum comparison value while notifying the second base station that the cell is to perform antenna correction or performing antenna correction.

The second base station determines whether the calibration parameter of the cell needs to be acquired:

Obtaining, by the second base station, the gain and/or phase of the radio frequency link corresponding to each antenna according to the situation that each antenna in the neighboring cell receives the sounding reference signal;

The second base station compares the gain and/or phase of the radio frequency link corresponding to each antenna in the neighboring cell, and obtains a maximum comparison value and a minimum comparison value in the comparison value;

Determining, by the second base station, that the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is within a preset range, and the obtained minimum comparison value is sent by the first base station The difference between the minimum comparison values is within a preset range, and then determining that the correction parameter of the cell needs to be acquired; the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is If the difference between the obtained minimum comparison value and the minimum comparison value sent by the base station is outside the preset range, it is determined that the correction parameter of the cell does not need to be acquired.

In the case that the cell has one antenna, the first base station determines that the antenna of the cell needs to be corrected as: the total gain of the strength/signal channel of the cell antenna receiving the sounding reference signal is small At a preset threshold, it is determined that the antenna of the cell needs to be corrected.

The first base station is further configured to: when notifying the second base station that the cell is to perform antenna correction or performing antenna correction, send the total gain/signal channel gain of the received sounding reference signal.

Obtaining, by the second base station, an overall gain/signal channel gain of the antenna receiving the sounding reference signal in the neighboring cell;

Determining, by the second base station, that the difference between the obtained strength of the received sounding reference signal and the total gain of the signal and the total gain of the signal channel of the received sounding reference signal sent by the first base station is within a preset range Determining that the correction parameter of the cell needs to be acquired; the difference between the obtained strength of the received sounding reference signal and the total gain of the signal channel and the total gain of the received sounding reference signal sent by the first base station/the total gain of the signal channel Outside the preset range, it is determined that it is not necessary to acquire the correction parameters of the cell.

Where the cell has more than one antenna, the first base station corrects multiple antennas in the cell to:

The first base station selects a reference antenna from multiple antennas of the cell;

The first base station adjusts the gain and/or phase of the radio link corresponding to the antenna to be adjusted according to the gain and/or phase of the radio link corresponding to the reference antenna, and notifies the user equipment to enter the antenna correction mode;

The user equipment enters an antenna correction mode, and measures a gain and/or a phase of the radio frequency link corresponding to the antenna to be adjusted, and reports the gain and/or phase to the first base station;

The first base station determines that the antenna correction needs to be continued according to the gain and/or phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then performs antenna correction.

The present invention is based on a TDD multi-point coordinated transmission antenna correction method and system. In a TDD multi-point coordinated transmission scenario, when an antenna in a cell needs to be corrected, the base to which the cell belongs The station notifies the neighboring cell of the cell, and corrects the antenna in the cell; if the neighboring cell needs to acquire the correction parameter of the cell, the cell sends the correction parameter to the neighbor after the calibration ends. The cell, the neighboring cell corrects the antenna therein by referring to the received correction parameter. According to the present invention, if the situation of the cell requiring antenna correction is similar to the case of the neighboring cell, the neighboring cell can wait for the cell to be corrected after the cell is corrected, and correct the antenna according to the correction parameter of the cell, thereby enabling Save more additional resources while ensuring the effectiveness of SRS feedback and improving feedback accuracy. DRAWINGS

1 is a schematic flowchart of an antenna correction method based on TDD multi-point coordinated transmission according to the present invention; FIG. 2 is a schematic flowchart of a method for correcting multiple antennas in a cell according to the present invention. detailed description

The basic idea of the present invention is: In a TDD multi-point coordinated transmission scenario, when an antenna in a cell needs to be corrected, a base station to which the cell belongs is notified to a neighboring cell of the cell, and an antenna in the cell Correction is performed; if the neighboring cell needs to obtain the correction parameter of the cell, the cell sends the correction parameter to the neighboring cell after the calibration ends, and the neighboring cell corrects the antenna therein by referring to the received correction parameter.

FIG. 1 is a schematic flowchart of an antenna correction method based on TDD multi-point coordinated transmission according to the present invention. As shown in FIG. 1, the method includes:

Step 101: In a TDD multi-point coordinated transmission scenario, the base station to which the cell belongs determines whether the antenna of the cell needs to be corrected. If yes, perform correction on the antenna in the cell, and perform step 102; otherwise, do not need to perform Antenna correction, the process ends.

The user equipment generally sends a sounding reference signal to the uplink on a regular basis, and is received by each antenna of the cell to which it belongs.

In the present invention, the base station to which the cell belongs may determine that the antenna of the cell needs to be Notifying a neighboring cell of the cell when performing row correction, the cell is about to perform antenna correction; and the neighboring cell of the cell may query the antenna correction of the cell, and the cell returns corresponding according to the query. In the case of antenna correction, antenna correction is being performed, and the neighboring cell is notified, and the cell is performing antenna correction.

If the cell has more than one antenna, the base station to which the cell belongs determines whether the antenna of the cell needs to be corrected. The gain of the radio link corresponding to each antenna is obtained according to the situation that each antenna of the cell receives the sounding reference signal. And/or phase, after which the gain and/or phase of the radio link corresponding to each antenna of the cell are compared in pairs, if the difference between the obtained maximum comparison value and the minimum comparison value is greater than a preset threshold, then It is determined that antenna correction is required; otherwise, it is determined that antenna correction is not required.

Correspondingly, the base station notifies the neighboring cell of the cell, and when the cell is to perform antenna correction or performs antenna correction, the maximum comparison value and the minimum comparison value may be sent to the neighboring cell.

Correspondingly, the base station notifies a neighboring cell of the cell, and when the cell is to perform antenna correction or performs antenna correction, the strength/signal channel total gain of the received sounding reference signal may be sent to the adjacent Community.

It should be noted that in a scenario where a single antenna is configured in a cell, since there is only one signal, there is no problem of phase difference of the multipath signal, so there is no need to perform phase correction of the radio frequency link, and only the gain of the radio link needs to be corrected. The main purpose is to modulate the amplification gain of the power amplifier. The signal strength of the SRS transmitted by the UE is represented by /^, (^ represents the gain of the channel (less than 1 and is actually the fading of the channel), and G _F represents the gain of the radio link of the base station, indicating the strength of the final received signal. P _r = P _{t X GcH X} G _RF . If detected too small, or, equivalently, the entire signal path (including the letter) Channel and RF link) Total gain (^^(^ is too small, this indicates that the channel fading is very strong ((^ is small), antenna correction is needed, increase (3⁄4 _F to compensate for channel fading. At this time the cell will The measured value / ^ or the equivalent signal channel (including channel and radio link) gain ^^^ informs the neighboring cell, if the situation of the neighboring cell is similar to the local cell (the value is similar or (^^(^ value is similar;) Then, the neighboring cell can be corrected using the correction value of the own cell.

Step 102: The neighboring cell of the cell determines whether it needs to acquire the correction parameter of the cell, and if yes, returns the determination result to the cell, and performs step 103; otherwise, the process ends.

In the case that the cell has more than one antenna, the neighboring cell determines whether it is necessary to acquire the correction parameter of the cell, which may be:

The neighboring cell determines that the difference between the obtained maximum comparison value and the maximum comparison value sent by the cell in step 101 is within a preset range, and the obtained minimum comparison value is as described in step 101. The difference between the minimum comparison value sent by the cell is within a preset range, and then determining that the correction parameter of the cell needs to be acquired; the difference between the obtained maximum comparison value and the maximum comparison value sent by the cell in step 101 If the difference between the obtained minimum comparison value and the minimum comparison value sent by the cell in step 101 is outside the preset range, it is determined that the correction of the cell is not required to be acquired. parameter.

In the case that the cell has one antenna, the neighboring cell determines whether it is necessary to acquire the correction parameter of the cell:

The adjacent 'j, the area determines the total strength/signal channel increase of the acquired received sounding reference signal The difference between the strength of the received sounding reference signal and the total gain of the signal channel sent by the cell is within a preset range, and then determining that the correction parameter of the cell needs to be acquired; the strength of the acquired received sounding reference signal The difference between the total gain of the signal channel and the total gain of the received sounding reference signal sent by the cell/the total gain of the signal channel is outside the preset range, and it is determined that the correction parameter of the cell does not need to be acquired.

Step 103: The cell sends the correction parameter to the neighboring cell after the calibration ends. Step 104: The neighboring cell corrects the antenna therein according to the correction parameter from the cell.

2 is a schematic flowchart of a method for correcting multiple antennas in a cell according to the present invention. As shown in FIG. 2, performing correction on multiple antennas in a cell may include:

Step 1021: The base station selects a reference antenna from multiple antennas of the cell.

Here, the selection of the reference antenna may have various methods. For example, the antenna with the worst gain of the corresponding RF link among the plurality of antennas may be selected as the reference antenna, or the reference antenna may be selected from the plurality of antennas according to a certain algorithm.

Step 1022: The base station adjusts the gain and/or phase of the radio link corresponding to the antenna to be adjusted according to the gain and/or phase of the radio link corresponding to the reference antenna, and notifies the user equipment to enter the antenna calibration mode.

Here, the antenna to be adjusted is one or more of antenna antennas other than the reference antenna.

The base station notifies the user equipment to enter the antenna correction mode by transmitting antenna correction signaling.

When the gain and/or phase of the radio link corresponding to the antenna is adjusted according to the gain and/or phase of the radio link corresponding to the reference antenna, generally according to the gain and/or phase and reference of the radio link corresponding to the antenna to be adjusted. The gain and/or phase difference of the RF link corresponding to the antenna is adjusted correspondingly to the amplifier and/or phase shifter of the antenna to be adjusted.

Step 1023: The user equipment enters an antenna calibration mode, and measures an antenna corresponding to the antenna to be adjusted. The gain and/or phase of the radio frequency link is reported to the base station.

Generally, the user equipment in the antenna correction mode suspends transmission of data.

Step 1024: The base station determines whether it is necessary to continue the antenna correction according to the gain and/or phase of the radio link corresponding to the antenna to be adjusted reported by the user equipment. If yes, return to step 1022; otherwise, the process ends.

Here, it is determined whether the antenna correction needs to be continued: the gain and/or phase of the radio link corresponding to the antenna to be adjusted reported by the user equipment is compared with the gain and/or phase of the radio link corresponding to the reference antenna, and the error is Within the error range set, it is determined that it is not necessary to continue the antenna correction; otherwise, the correction needs to be continued.

Here, the base station may further set an antenna adjustment threshold. If the antenna adjustment time exceeds the antenna adjustment threshold, the base station terminates the current antenna correction. After the base station terminates the antenna correction, the base station may use other methods for feedback, and the condition is mature (the traffic volume) A new antenna correction attempt is initiated again at a reduced time or other suitable time.

The present invention also provides an antenna correction system based on TDD multi-point coordinated transmission, including: a first base station and a second base station;

The first base station is further configured to: when determining that the antenna of the cell under the first base station needs to be corrected, notify the second base station that the cell is to perform antenna correction. The second base station is further configured to query an antenna correction situation of the cell; the first base station is further configured to: when receiving an inquiry by the second base station, and the cell is performing antenna correction, Notifying the neighboring cell that the cell is undergoing antenna correction.

In the case that the cell has one antenna, the first base station determines that the antenna of the cell needs to be corrected as follows: If the total strength of the strength/signal channel of the cell antenna receiving the sounding reference signal is less than a preset threshold, it is determined that the antenna needs to be The antenna of the cell is corrected. The first base station is further configured to: when notifying the second base station, that the cell is to perform antenna correction or performing antenna correction, and send the strength/signal channel total gain of the received sounding reference signal.

It should be noted that the first base station and the second base station may be the same base station.

The invention fully utilizes the uplink and downlink working in the same frequency band and the reciprocity of the electromagnetic field, and the base station initiates and controls the calibration process of the entire antenna, and the user equipment fully cooperates to reduce The time the antenna is corrected.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

1. An antenna correction method based on TDD multi-point cooperative transmission, characterized in that: the method comprises:

The method according to claim 1, wherein, when the base station to which the cell belongs determines that the antenna of the cell needs to be corrected, the method further includes: the base station notifying the neighboring cell of the cell, The cell is about to undergo antenna correction.

The method according to claim 1, wherein the method further comprises: querying, by the neighboring cell of the cell, an antenna correction condition of the cell;

The method according to claim 2 or 3, wherein, when the cell has more than one antenna, the base station to which the cell belongs determines that the antenna of the cell needs to be corrected to: the cell The associated base station obtains the gain and/or phase of the radio link corresponding to each antenna according to the situation that each antenna of the cell receives the sounding reference signal, and then compares the gain and/or phase of the corresponding RF link of each antenna of the cell. If the difference between the obtained maximum comparison value and the minimum comparison value is greater than a preset threshold, it is determined that antenna correction is required.

The method according to claim 4, wherein the method further comprises: the base station notifying a neighboring cell of the cell, where the cell is to perform antenna correction or performing antenna correction, the maximum The comparison value and the most d, the comparison value are sent to the neighboring cell.

The method according to claim 5, wherein the determining, by the neighboring cell, whether the correction parameter of the cell needs to be acquired is:

And comparing, by the neighboring cell, a gain and/or a phase of a radio frequency link corresponding to each antenna, and obtaining a maximum comparison value and a minimum comparison value in the comparison value;

The method according to claim 2 or 3, wherein, when the cell has one antenna, the base station to which the cell belongs determines that the antenna of the cell needs to be corrected as: If the strength of the signal/total gain of the signal channel is less than a preset threshold, it is determined that the antenna of the cell needs to be corrected.

The method according to claim 7, wherein the method further comprises: the base station notifying a neighboring cell of the cell, where the cell is to perform antenna correction or performing antenna correction, the receiving The strength of the sounding reference signal/the total gain of the signal channel is sent to the neighboring cell.

The method according to claim 8, wherein the determining, by the neighboring cell, whether the correction parameter of the cell needs to be acquired is:

The neighboring cell determines an increase in the strength/signal channel of the acquired received sounding reference signal The difference between the strength of the received sounding reference signal and the total gain of the signal channel sent by the cell is within a preset range, and then determining that the correction parameter of the cell needs to be acquired; the strength of the acquired received sounding reference signal The difference between the total gain of the signal channel and the total gain of the received sounding reference signal sent by the cell/the total gain of the signal channel is outside the preset range, and it is determined that the correction parameter of the cell does not need to be acquired.

10. The method according to claim 1, wherein, when the cell has more than one antenna, the base station corrects an antenna in the cell to:

An antenna correction system based on TDD multi-point coordinated transmission, characterized in that the system comprises: a first base station and a second base station;

12. The system of claim 11 wherein:

The first base station is further configured to: when determining that the antenna of the cell under the first base station needs to be corrected, notify the second base station that the cell is to perform antenna correction.

13. The system of claim 11 wherein:

The system according to claim 12 or 13, wherein, when the cell has more than one antenna, the first base station determines that the antenna of the cell under the first base station needs to be corrected to Obtaining the gain and/or phase of the radio link corresponding to each antenna according to the situation that each antenna of the cell receives the sounding reference signal, and then comparing the gain and/or phase of the corresponding RF link of each antenna of the cell, and obtaining If the difference between the maximum comparison value and the minimum comparison value in the comparison value is greater than a preset threshold, it is determined that antenna correction is required.

15. The system of claim 14 wherein:

The system according to claim 15, wherein the second base station determines whether the correction parameter of the cell needs to be acquired is:

Determining, by the second base station, that the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is within a preset range, and the obtained minimum comparison value is sent by the first base station If the difference between the minimum comparison values is within a preset range, it is determined that the cell needs to be acquired Correction parameter; the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is outside a preset range, or the minimum comparison value obtained is compared with the minimum comparison sent by the base station If the difference between the values is outside the preset range, it is determined that the correction parameters of the cell do not need to be acquired.

The system according to claim 12 or 13, wherein, when the cell has one antenna, the first base station determines that the antenna of the cell needs to be corrected as: the cell antenna receives the sounding reference signal The strength/signal channel total gain is less than a preset threshold, and it is determined that the antenna of the cell needs to be corrected.

18. The system of claim 17 wherein:

The system according to claim 18, wherein the second base station determines whether the correction parameter of the cell needs to be acquired is:

The system according to claim 11, wherein, when the cell has more than one antenna, the first base station corrects multiple antennas in the cell to: the first base station Selecting a reference antenna from a plurality of antennas of the cell; The first base station adjusts the gain and/or phase of the radio link corresponding to the antenna to be adjusted according to the gain and/or phase of the radio link corresponding to the reference antenna, and notifies the user equipment to enter the antenna correction mode;