CN102315866B - Method and system for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission - Google Patents
Method and system for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission Download PDFInfo
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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Abstract
The invention discloses a method for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission. The method comprises the following steps that: if determining that the antennae of a cell are required to be calibrated, a base station calibrates a plurality of antennae in the cell; if determining that calibration parameters of the cell are required to be acquired, a neighbor cell returns a judgment result to the cell; and after calibration is finished, the cell sends the calibration parameters to the neighbor cell, and the neighbor cell calibrates the antennae in the cell according to the calibration parameters of the cell. Correspondingly, the invention also discloses a system for calibrating the antennae based on the TDD coordinated multi-point transmission. By the invention, if the situation of the cell which is required to be subjected to antenna calibration is similar to that of the neighbor cell, the neighbor cell can calibrate the antennae in the cell according to the calibration parameters of the cell after the antenna calibration of the cell is finished, so more auxiliary resources can be saved during the guaranteeing of the effectiveness of sounding reference signal (SRS) feedback and the improvement of feedback accuracy.
Description
Technical Field
The present invention relates to a Coordinated Multi-Point (CoMP) transmission technology, and in particular, to an antenna calibration method and system based on Time Division Duplex (TDD) CoMP transmission.
Background
LTE-a is a latest Generation wireless communication standard developed and developed by the 3rd Generation partnership project (3 GPP), which 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, and this technology can realize improvement of various technical indexes such as improvement of peak transmission rate, enhancement of coverage at the edge of a cell, and the like by adopting multiple nodes for cooperative transmission/reception, and the most common working mode of CoMP is as follows: when User Equipment (UE) is in a cell center area, interference of adjacent cells is small, and channel conditions are good, in this case, CoMP may work in a cooperative transmission mode, so as to enable the UE to obtain a highest data transmission rate. In this mode, a plurality of transmitting nodes in the cooperating set transmit independent data streams to the terminal at the same time, and thus is a multi-node space division multiplexing mode. Compared with the space division multiplexing of a single node, the space division multiplexing of the multi-node cooperative transmission has better channel independence, so that a better multiplexing effect can be obtained.
In a conventional non-cooperative transmission scenario, when a UE is located at a cell edge, the UE has poor reception effect, which is caused by the following two reasons: firstly, after the transmission signal of the cell is subjected to long-distance decay, the intensity of the transmission signal is weaker and is equivalent to the signal intensity of the adjacent cell under the condition of not carrying out special power control; second, in the conventional non-cooperative mode, the UE receives signal interference of neighboring cells (frequency reuse factor between cells is 1 in LTE-a). Under the above situation, if a Beam Forming (BF) mode of CoMP transmission is adopted, not only the interference of neighboring cells can be avoided, but also waste can be changed into valuable, and the signal coverage at the cell edge can be enhanced.
In this process, the UE needs to perform information feedback to the E-NodeB in time, because only on the premise of sufficient and timely information feedback, each node in the cooperation set can adjust and select the most appropriate working mode under the condition of exchanging information with each other, for this reason, the information feedback mode of the UE is fully studied in the 3GPP, and there are mainly the following three modes:
1) explicit feedback
The UE feeds back the observed channel without any transformation and processing.
2) Implicit feedback
At this time, the UE feeds back a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), or a Channel Rank Indicator (RI).
3) Sounding Reference Signal (SRS) feedback using UE transmission
The feedback is to estimate the downlink channel by the base station (E-NodeB) through the SRS signals of the uplink and downlink. Systems operating in TDD mode may employ this form of feedback.
Compared with the first feedback mode and the second feedback mode, the third feedback mode makes full use of the electromagnetic reciprocity of the physical channel of the TDD system, has high feedback precision and requires few additional resources, so the third feedback mode is the most ideal feedback mode in the TDD system.
However, in the TDD system, only the physical channel has reciprocity, and is affected by many factors such as temperature and path loss, the amplitude/phase of the gain of the radio frequency link corresponding to each antenna may be misaligned, which causes the gains of the uplink and downlink radio frequency links and the antennas to be different. Therefore, the TDD system cannot directly use the SRS feedback without correcting and compensating the rf link and antenna gain.
The existing correction method mainly aims at the problem of gain correction between the uplink and the downlink of a radio frequency link corresponding to one antenna or the problem of gain correction between independent array elements of the same array antenna, and an antenna correction technology applied to TDD multipoint cooperative transmission does not exist.
Disclosure of Invention
In view of the above, the present invention provides an antenna calibration method and system based on TDD coordinated multi-point transmission, which can calibrate multiple antennas in TDD coordinated multi-point transmission, thereby ensuring effectiveness of SRS feedback, improving feedback accuracy, and saving additional resources.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an antenna correction method based on TDD coordinated multi-point transmission includes:
in a TDD (time division duplex) multipoint cooperative transmission scene, a base station to which a cell belongs judges that an antenna of the cell needs to be corrected, and then the antenna in the cell is corrected;
the adjacent cell judges that the correction parameters of the cell need to be acquired, and returns the judgment result to the cell;
and after the cell finishes the correction, the cell sends the correction parameters to the adjacent cell, and the adjacent cell corrects the antenna in the adjacent cell according to the correction parameters 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 informs the neighboring cells of the cell that the cell is to perform antenna calibration.
The method further comprises the following steps: the adjacent cells of the cell inquire the antenna correction condition of the cell;
and if the cell is carrying out antenna correction, informing the adjacent cell that the cell is carrying out antenna correction.
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 as follows: and the base station to which the cell belongs acquires the gain and/or phase of the radio frequency link corresponding to each antenna according to the condition that each antenna of the cell receives the sounding reference signal, then compares the gain and/or phase of the radio frequency link corresponding to each antenna of the cell with each other, and judges that antenna correction is needed if the difference value between the maximum comparison value and the minimum comparison value in the acquired comparison values is greater than a preset threshold.
The method further comprises the following steps: and the base station informs the adjacent cells of the cell, and the cell sends the maximum comparison value and the minimum comparison value to the adjacent cells when the antenna correction is about to be carried out or is carried out.
The adjacent cell judges whether the correction parameters of the cell need to be acquired are as follows:
the adjacent cell acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna receives the sounding reference signal;
the adjacent cells compare the gain and/or the phase of the radio frequency link corresponding to each antenna pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the adjacent cell determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the cell is in a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the cell is in a preset range, and then determines that the correction parameter of the cell needs to be obtained; and determining that the correction parameters of the cell do not need to be acquired if the difference between the acquired maximum comparison value and the maximum comparison value sent by the cell is outside a preset range or the difference between the acquired minimum comparison value and the minimum comparison value sent by the cell is outside the preset range.
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 follows: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
The method further comprises the following steps: and the base station informs the adjacent cells of the cell, and the cell sends the strength/signal channel total gain of the received sounding reference signal to the adjacent cells when the antenna correction is about to be carried out or is carried out.
The adjacent cell judges whether the correction parameters of the cell need to be acquired are as follows:
the adjacent cell acquires the strength/total gain of a signal channel of an antenna receiving sounding reference signal;
the adjacent cell determines that the difference value between the acquired intensity/total gain of the signal channel of the received sounding reference signal and the intensity/total gain of the signal channel of the received sounding reference signal sent by the cell is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference value between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the cell is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
In the case where the cell has more than one antenna, the base station corrects the antennas in the cell to:
the base station selecting a reference antenna from a plurality of antennas of the cell;
the base station adjusts the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode;
the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to an antenna to be adjusted, and reports the gain and/or the phase to the base station;
and the base station judges that the antenna correction needs to be continued according to the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then the antenna correction is continued.
An antenna calibration system based on TDD coordinated multi-point transmission, comprising: a first base station and a second base station; wherein,
the first base station is configured to, when it is determined that an antenna of a cell under the first base station needs to be corrected in a TDD coordinated multi-point transmission scenario, correct the antenna in the cell; when the second base station needs to acquire the correction parameters of the cell, after the cell correction is finished, the correction parameters are sent to the second base station;
the second base station is a base station to which a cell adjacent to the cell belongs, and is configured to determine whether a correction parameter of the cell needs to be acquired, and return a determination result to the first base station when determining that the correction parameter of the cell needs to be acquired; and correcting the antenna of the adjacent cell under the correction parameter according to the correction parameter from the first base station.
The first base station is further configured to notify the second base station that the cell is to perform antenna calibration when it is determined that the antenna calibration of the cell under the first base station is required.
The second base station is further configured to query an antenna correction condition of the cell;
the first base station is further configured to notify the neighboring cell that the cell is performing antenna calibration when the cell is performing antenna calibration while receiving the query of the second base station.
In the case where 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 as: and then, comparing the gain and/or the phase of the radio frequency link corresponding to each antenna of the cell pairwise, wherein the difference value between the maximum comparison value and the minimum comparison value in the obtained comparison values is greater than a preset threshold, and judging that antenna correction is needed.
The first base station is further configured to send the maximum comparison value and the minimum comparison value while notifying a second base station that the cell is about to perform antenna correction or is performing antenna correction.
The second base station judges whether the correction parameters of the cell need to be acquired are as follows:
the second base station acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna in the adjacent cell receives the sounding reference signal;
the second base station compares the gain and/or the phase of the radio frequency link corresponding to each antenna in the adjacent cell pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the second base station determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the first base station is in a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the first base station is in a preset range, and then determines that the correction parameters of the cell need to be obtained; and if the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is out of a preset range, or the difference between the obtained minimum comparison value and the minimum comparison value sent by the base station is out of a preset range, determining that the correction parameters of the cell do not need to be obtained.
In the case where the cell has one antenna, the first base station determines that the antenna of the cell needs to be corrected as: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
The first base station is further configured to send the strength of the received sounding reference signal/the total gain of the signal channel while notifying the second base station that the cell is about to perform antenna calibration or is performing antenna calibration.
The second base station judges whether the correction parameters of the cell need to be acquired are as follows:
the second base station acquires the intensity of the antenna receiving sounding reference signal/the total gain of the signal channel in the adjacent cell;
the second base station determines that the difference value between the acquired strength/total gain of the signal channel of the received sounding reference signal and the strength/total gain of the signal channel of the received sounding reference signal sent by the first base station is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the first base station is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
In the case where the cell has more than one antenna, the first base station corrects the 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 the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode;
the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to an antenna to be adjusted, and reports the gain and/or the phase to the first base station;
and the first base station judges that antenna correction needs to be continued according to the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then the first base station continues to carry out the antenna correction.
In the method and the system for correcting the antenna based on the TDD multipoint cooperative transmission, when the antenna in a cell needs to be corrected in a TDD multipoint cooperative transmission scene, a base station to which the cell belongs informs an adjacent cell of the cell and corrects the antenna in the cell; and if the adjacent cell needs to acquire the correction parameters of the cell, the cell sends the correction parameters to the adjacent cell after the correction is finished, and the adjacent cell corrects the antenna in the adjacent cell by referring to the received correction parameters. By the method and the device, if the condition of the cell needing antenna correction is similar to that of the adjacent cell, the adjacent cell can correct the antenna according to the correction parameters of the cell after the cell is corrected, so that the effectiveness of SRS feedback can be ensured, the feedback precision is improved, and more additional resources are saved.
Drawings
Fig. 1 is a flowchart illustrating an antenna calibration method based on TDD coordinated multiple point transmission according to the present invention;
fig. 2 is a flowchart illustrating a method for calibrating a plurality of antennas in a cell according to the present invention.
Detailed Description
The basic idea of the invention is: in a TDD (time division duplex) multipoint coordinated transmission scene, when an antenna in a cell needs to be corrected, a base station to which the cell belongs informs an adjacent cell of the cell and corrects the antenna in the cell; and the adjacent cell needs to acquire the correction parameters of the cell, the cell sends the correction parameters to the adjacent cell after the correction is finished, and the adjacent cell corrects the antenna in the adjacent cell by referring to the received correction parameters.
Fig. 1 is a schematic flow chart of an antenna calibration method based on TDD coordinated multi-point transmission according to the present invention, as shown in fig. 1, the method includes:
step 101: under a TDD (time division duplex) multipoint coordinated transmission scene, a base station to which a cell belongs judges whether the antenna of the cell needs to be corrected, if so, the antenna in the cell is corrected, and step 102 is executed; otherwise, the antenna correction is not needed, and the process is ended.
The ue generally sends sounding reference signals to the uplink periodically, and receives the sounding reference signals from each antenna of the cell to which the ue belongs.
In the present invention, the base station to which the cell belongs may notify the neighboring cell of the cell when it is determined that the antenna of the cell needs to be corrected, the cell is about to perform antenna correction, or the neighboring cell of the cell may inquire about the antenna correction condition of the cell, the cell returns a corresponding antenna correction condition according to the inquiry, and if the antenna correction is being performed, the base station notifies the neighboring cell, and the cell performs antenna correction.
When the cell has more than one antenna, the step of determining whether the antenna of the cell needs to be corrected by the base station to which the cell belongs may be: acquiring the gain and/or phase of a radio frequency link corresponding to each antenna according to the condition that each antenna of a cell receives a sounding reference signal, then comparing the gain and/or phase of the radio frequency link corresponding to each antenna of the cell with each other, and if the difference value between the maximum comparison value and the minimum comparison value in the acquired comparison values is greater than a preset threshold, judging that antenna correction is needed; otherwise, it is determined that antenna correction is not required.
Correspondingly, the base station informs the adjacent cell of the cell, and when the cell is about to perform antenna correction or is performing antenna correction, the maximum comparison value and the minimum comparison value are sent to the adjacent cell.
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 follows: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
Correspondingly, the base station informs the adjacent cells of the cell, and when the cell is about to perform antenna correction or is performing antenna correction, the strength/signal channel total gain of the received sounding reference signal is sent to the adjacent cells.
It should be noted that, in a scenario where a single antenna is configured in a cell, there is no problem of phase difference between multiple signals because there is only one signal, so that it is not necessary to perform phase correction on a radio frequency link, but only needs to correct the gain of the radio frequency link, and actually it is mainly the amplification gain of a modulation power amplifier. With PtIndicating the signal strength, G, of the UE transmitted SRSCHIndicating the gain of the channel (less than 1, actually the fading of the channel), GRFRepresenting the gain, P, of the radio link of the base stationrIndicating the strength of the final received signal. Then there are: pr＝Pt×GCH×GRF. If P is detectedrToo small, or, equivalently, the total gain G of the entire signal path (including the channel and the radio frequency link)CH×GRFToo small, which indicates that the channel fading is strong (G)CHSmall), antenna calibration is required,Increase GRFTo compensate for channel fading. At this point the cell will measure the value PrOr equivalent signal path (including channel and radio frequency link) gain GCH×GRFInforming the neighboring cell if the situation of the neighboring cell is similar to that of the cell (P)rValue of similar or GCH×GRFSimilar values), the neighboring cells can be corrected using the correction value of the own cell.
Step 102: the adjacent cell of the cell judges whether the correction parameter of the cell needs to be acquired, if so, the judgment result is returned to the cell, and step 103 is executed; otherwise, the flow ends.
When the cell has more than one antenna, the neighboring cell may determine whether the correction parameter of the cell needs to be acquired, where the correction parameter is:
the adjacent cell acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna receives the sounding reference signal;
the adjacent cells compare the gain and/or the phase of the radio frequency link corresponding to each antenna pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the adjacent cell determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the cell in the step 101 is within a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the cell in the step 101 is within a preset range, and then determines that the correction parameter of the cell needs to be obtained; and if the difference between the obtained maximum comparison value and the maximum comparison value sent by the cell in the step 101 is outside a preset range, or the difference between the obtained minimum comparison value and the minimum comparison value sent by the cell in the step 101 is outside the preset range, determining that the correction parameter of the cell does not need to be obtained.
Under the condition that the cell has one antenna, the adjacent cell judges whether the correction parameters of the cell need to be acquired are as follows:
the adjacent cell acquires the strength/total gain of a signal channel of an antenna receiving sounding reference signal;
the adjacent cell determines that the difference value between the acquired intensity/total gain of the signal channel of the received sounding reference signal and the intensity/total gain of the signal channel of the received sounding reference signal sent by the cell is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference value between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the cell is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
Step 103: and after the cell finishes the correction, sending the correction parameters to the adjacent cell.
Step 104: and the adjacent cell corrects the antenna in the adjacent cell according to the correction parameter from the cell.
Fig. 2 is a schematic flow chart of a method for correcting multiple antennas in a cell according to the present invention, and as shown in fig. 2, correcting multiple antennas in a cell may include:
step 1021: the base station selects a reference antenna from a plurality of antennas of the cell.
Here, there may be various methods for selecting the reference antenna, for example, an antenna corresponding to the worst radio frequency link gain among the multiple antennas may be selected as the reference antenna, or the reference antenna may be selected from the multiple antennas according to a certain algorithm.
Step 1022: and the base station adjusts the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode.
Here, the antenna to be adjusted is one or more of the other antennas except the reference antenna in the cell antenna.
The base station informs the user equipment to enter the antenna correction mode by transmitting antenna correction signaling.
When the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted are adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, the amplifier and/or the phase shifter of the antenna to be adjusted are/is correspondingly adjusted according to the difference value between the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted and the gain and/or the phase of the radio frequency link corresponding to the reference antenna.
Step 1023: and the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to the antenna to be adjusted and reports the gain and/or the phase to the base station.
Generally, the user equipment in the antenna calibration mode suspends transmitting data.
Step 1024: the base station determines whether to continue antenna correction 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 if so, returns to step 1022; otherwise, the flow ends.
Here, whether or not the antenna correction needs to be continued is determined as: comparing the gain and/or phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment with the gain and/or phase of the radio frequency link corresponding to the reference antenna, and judging that antenna correction is not needed to be carried out continuously if the error is within a preset error range; otherwise, correction is also required to continue.
Here, the base station may also preset an antenna adjustment threshold, and if the antenna adjustment time exceeds the antenna adjustment threshold, the base station terminates the antenna correction, and after terminating the antenna correction, the base station may use another method for feedback, and after the condition is mature (when the traffic volume decreases or at another suitable time), a new antenna correction attempt is started again.
The invention also provides an antenna correction system based on TDD multipoint cooperative transmission, which comprises: a first base station and a second base station; wherein,
the first base station is configured to, when it is determined that an antenna of a cell under the first base station needs to be corrected in a TDD coordinated multi-point transmission scenario, correct the antenna in the cell; when the second base station needs to acquire the correction parameters of the cell, after the cell correction is finished, the correction parameters are sent to the second base station;
the second base station is a base station to which a cell adjacent to the cell belongs, and is configured to determine whether a correction parameter of the cell needs to be acquired, and return a determination result to the first base station when determining that the correction parameter of the cell needs to be acquired; and correcting the antenna of the adjacent cell under the correction parameter according to the correction parameter from the first base station.
The first base station is further configured to notify the second base station that the cell is to perform antenna calibration when it is determined that the antenna calibration of the cell under the first base station is required.
The second base station is further configured to query an antenna correction condition of the cell;
the first base station is further configured to notify the neighboring cell that the cell is performing antenna calibration when the cell is performing antenna calibration while receiving the query of the second base station.
In the case where 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 as: and then, comparing the gain and/or the phase of the radio frequency link corresponding to each antenna of the cell pairwise, wherein the difference value between the maximum comparison value and the minimum comparison value in the obtained comparison values is greater than a preset threshold, and judging that antenna correction is needed.
The first base station is further configured to send the maximum comparison value and the minimum comparison value while notifying a second base station that the cell is about to perform antenna correction or is performing antenna correction.
The second base station judges whether the correction parameters of the cell need to be acquired are as follows:
the second base station acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna in the adjacent cell receives the sounding reference signal;
the second base station compares the gain and/or the phase of the radio frequency link corresponding to each antenna in the adjacent cell pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the second base station determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the first base station is in a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the first base station is in a preset range, and then determines that the correction parameters of the cell need to be obtained; and if the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is out of a preset range, or the difference between the obtained minimum comparison value and the minimum comparison value sent by the base station is out of a preset range, determining that the correction parameters of the cell do not need to be obtained.
In the case where the cell has one antenna, the first base station determines that the antenna of the cell needs to be corrected as: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
The first base station is further configured to send the strength of the received sounding reference signal/the total gain of the signal channel while notifying the second base station that the cell is about to perform antenna calibration or is performing antenna calibration.
The second base station judges whether the correction parameters of the cell need to be acquired are as follows:
the second base station acquires the intensity of the antenna receiving sounding reference signal/the total gain of the signal channel in the adjacent cell;
the second base station determines that the difference value between the acquired strength/total gain of the signal channel of the received sounding reference signal and the strength/total gain of the signal channel of the received sounding reference signal sent by the first base station is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the first base station is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
In the case where the cell has more than one antenna, the first base station corrects the 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 the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode;
the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to an antenna to be adjusted, and reports the gain and/or the phase to the first base station;
and the first base station judges that antenna correction needs to be continued according to the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then the first base station continues to carry out the antenna correction.
The invention makes full use of the reciprocity of the electromagnetic field and the uplink and downlink working on the same frequency band, the base station initiates and controls the correction process of the whole antenna, and the user equipment is fully matched to reduce the time for correcting the antenna.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (18)
1. An antenna calibration method based on TDD coordinated multi-point transmission is characterized in that the method comprises the following steps:
in a TDD (time division duplex) multipoint cooperative transmission scene, a base station to which a cell belongs judges that an antenna of the cell needs to be corrected, and then the antenna in the cell is corrected;
the adjacent cell judges that the correction parameters of the cell need to be acquired, and then the judgment result is returned to the cell;
after the cell finishes the correction, the cell sends the correction parameters to the adjacent cell, and the adjacent cell corrects the antenna therein according to the correction parameters from the cell;
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 as follows: and the base station to which the cell belongs acquires the gain and/or phase of the radio frequency link corresponding to each antenna according to the condition that each antenna of the cell receives the sounding reference signal, then compares the gain and/or phase of the radio frequency link corresponding to each antenna of the cell with each other, and judges that antenna correction is needed if the difference value between the maximum comparison value and the minimum comparison value in the acquired comparison values is greater than a preset threshold.
2. The method of 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 comprises: the base station informs the neighboring cells of the cell that the cell is to perform antenna calibration.
3. The method of claim 1, further comprising: the adjacent cells of the cell inquire the antenna correction condition of the cell;
and if the cell is carrying out antenna correction, informing the adjacent cell that the cell is carrying out antenna correction.
4. The method of claim 1, further comprising: and the base station informs the adjacent cells of the cell, and the cell sends the maximum comparison value and the minimum comparison value to the adjacent cells when the antenna correction is about to be carried out or is carried out.
5. The method of claim 4, wherein the neighboring cell determining whether the correction parameter of the cell needs to be obtained is:
the adjacent cell acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna receives the sounding reference signal;
the adjacent cells compare the gain and/or the phase of the radio frequency link corresponding to each antenna pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the adjacent cell determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the cell is in a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the cell is in a preset range, and then determines that the correction parameter of the cell needs to be obtained; and determining that the correction parameters of the cell do not need to be acquired if the difference between the acquired maximum comparison value and the maximum comparison value sent by the cell is outside a preset range or the difference between the acquired minimum comparison value and the minimum comparison value sent by the cell is outside the preset range.
6. 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: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
7. The method of claim 6, further comprising: and the base station informs the adjacent cells of the cell, and the cell sends the strength/signal channel total gain of the received sounding reference signal to the adjacent cells when the antenna correction is about to be carried out or is carried out.
8. The method of claim 1, wherein the neighboring cell determining whether the correction parameter of the cell needs to be obtained is:
the adjacent cell acquires the strength/total gain of a signal channel of an antenna receiving sounding reference signal;
the adjacent cell determines that the difference value between the acquired intensity/total gain of the signal channel of the received sounding reference signal and the intensity/total gain of the signal channel of the received sounding reference signal sent by the cell is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference value between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the cell is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
9. The method of claim 1, wherein if the cell has more than one antenna, the base station corrects the antennas in the cell to:
the base station selecting a reference antenna from a plurality of antennas of the cell;
the base station adjusts the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode;
the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to an antenna to be adjusted, and reports the gain and/or the phase to the base station;
and the base station judges that the antenna correction needs to be continued according to the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then the antenna correction is continued.
10. An antenna calibration system based on TDD coordinated multi-point transmission, the system comprising: a first base station and a second base station; wherein,
the first base station is configured to, when it is determined that an antenna of a cell under the first base station needs to be corrected in a TDD coordinated multi-point transmission scenario, correct the antenna in the cell; when the second base station needs to acquire the correction parameters of the cell, after the cell correction is finished, the correction parameters are sent to the second base station;
the second base station is a base station to which a cell adjacent to the cell belongs, and is configured to determine whether a correction parameter of the cell needs to be acquired, and return a determination result to the first base station when determining that the correction parameter of the cell needs to be acquired; correcting the antenna of the adjacent cell under the first base station according to the correction parameter from the first base station;
in the case where 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 as: and then, comparing the gain and/or the phase of the radio frequency link corresponding to each antenna of the cell pairwise, wherein the difference value between the maximum comparison value and the minimum comparison value in the obtained comparison values is greater than a preset threshold, and judging that antenna correction is needed.
11. The system of claim 10,
the first base station is further configured to notify the second base station that the cell is to perform antenna calibration when it is determined that the antenna calibration of the cell under the first base station is required.
12. The system of claim 10,
the second base station is further configured to query an antenna correction condition of the cell;
the first base station is further configured to notify the neighboring cell that the cell is performing antenna calibration when the cell is performing antenna calibration while receiving the query of the second base station.
13. The system of claim 10,
the first base station is further configured to send the maximum comparison value and the minimum comparison value while notifying a second base station that the cell is about to perform antenna correction or is performing antenna correction.
14. The system according to claim 13, wherein the second base station determines whether the correction parameter of the cell needs to be acquired is:
the second base station acquires the gain and/or the phase of the radio frequency link corresponding to each antenna according to the condition that each antenna in the adjacent cell receives the sounding reference signal;
the second base station compares the gain and/or the phase of the radio frequency link corresponding to each antenna in the adjacent cell pairwise to obtain the maximum comparison value and the minimum comparison value in the comparison values;
the second base station determines that the difference value between the obtained maximum comparison value and the maximum comparison value sent by the first base station is in a preset range, and the difference value between the obtained minimum comparison value and the minimum comparison value sent by the first base station is in a preset range, and then determines that the correction parameters of the cell need to be obtained; and if the difference between the obtained maximum comparison value and the maximum comparison value sent by the first base station is out of a preset range, or the difference between the obtained minimum comparison value and the minimum comparison value sent by the base station is out of a preset range, determining that the correction parameters of the cell do not need to be obtained.
15. The system according to claim 11 or 12, wherein 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: and if the strength/signal channel total gain of the cell antenna for receiving the sounding reference signal is smaller than a preset threshold, judging that the cell antenna needs to be corrected.
16. The system of claim 15,
the first base station is further configured to send the strength of the received sounding reference signal/the total gain of the signal channel while notifying the second base station that the cell is about to perform antenna calibration or is performing antenna calibration.
17. The system of claim 16, wherein the second base station determines whether the correction parameter of the cell needs to be acquired is:
the second base station acquires the intensity of the antenna receiving sounding reference signal/the total gain of the signal channel in the adjacent cell;
the second base station determines that the difference value between the acquired strength/total gain of the signal channel of the received sounding reference signal and the strength/total gain of the signal channel of the received sounding reference signal sent by the first base station is within a preset range, and then determines that the correction parameter of the cell needs to be acquired; and if the difference between the obtained strength/signal channel total gain of the received sounding reference signal and the strength/signal channel total gain of the received sounding reference signal sent by the first base station is outside a preset range, determining that the correction parameter of the cell does not need to be obtained.
18. The system of claim 10, wherein if the cell has more than one antenna, the first base station corrects the plurality of 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 the phase of the radio frequency link corresponding to the antenna to be adjusted according to the gain and/or the phase of the radio frequency link corresponding to the reference antenna, and informs the user equipment to enter an antenna correction mode;
the user equipment enters an antenna correction mode, measures the gain and/or the phase of a radio frequency link corresponding to an antenna to be adjusted, and reports the gain and/or the phase to the first base station;
and the first base station judges that antenna correction needs to be continued according to the gain and/or the phase of the radio frequency link corresponding to the antenna to be adjusted reported by the user equipment, and then the first base station continues to carry out the antenna correction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010219967.0A CN102315866B (en) | 2010-07-06 | 2010-07-06 | Method and system for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission |
| PCT/CN2010/078042 WO2012003682A1 (en) | 2010-07-06 | 2010-10-22 | Method and system for antenna calibration based on time division duplexing coordinated multi-point transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010219967.0A CN102315866B (en) | 2010-07-06 | 2010-07-06 | Method and system for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission |
Publications (2)
| Publication Number | Publication Date |
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| CN102315866A CN102315866A (en) | 2012-01-11 |
| CN102315866B true CN102315866B (en) | 2015-07-22 |
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| CN201010219967.0A Expired - Fee Related CN102315866B (en) | 2010-07-06 | 2010-07-06 | Method and system for calibrating antennae based on time division duplexing (TDD) coordinated multi-point transmission |
Country Status (2)
| Country | Link |
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| CN (1) | CN102315866B (en) |
| WO (1) | WO2012003682A1 (en) |
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| CN109348533B (en) * | 2013-05-15 | 2021-12-14 | 华为技术有限公司 | Signal adjusting method and device and cell |
| CN106664144A (en) * | 2014-06-13 | 2017-05-10 | 诺基亚通信公司 | Method, apparatus and computer program |
| EP3565134B1 (en) | 2017-01-24 | 2020-08-05 | Huawei Technologies Co., Ltd. | Antenna correction method and device |
| CN108880702B (en) * | 2017-05-10 | 2022-03-25 | 中兴通讯股份有限公司 | Antenna correction method and device for FDD system and base station |
| CN108956650B (en) * | 2017-05-25 | 2021-09-24 | 北京君和信达科技有限公司 | Detector gain automatic configuration method, device and system and storage medium |
| CN112311481B (en) * | 2019-08-02 | 2023-09-15 | 中兴通讯股份有限公司 | Antenna correction method, base station and storage medium |
| CN114650105A (en) * | 2020-12-21 | 2022-06-21 | 中兴通讯股份有限公司 | Cell antenna correction method, electronic device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100675489B1 (en) * | 2004-11-23 | 2007-01-29 | 삼성전자주식회사 | Smart Antenna Communication System Employing Apparatus And Method For Signal Calibration |
| CN101686080A (en) * | 2008-09-24 | 2010-03-31 | 中兴通讯股份有限公司 | Multipoint-cooperation transmission method |
| CN101741432B (en) * | 2008-11-19 | 2014-02-05 | 夏普株式会社 | L1 multi-antenna relay station and power control method thereof |
| CN101662824B (en) * | 2009-09-11 | 2014-08-27 | 北京邮电大学 | Synergistic multi-point system, user equipment and uplink power control method |
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2010
- 2010-07-06 CN CN201010219967.0A patent/CN102315866B/en not_active Expired - Fee Related
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| WO2012003682A1 (en) | 2012-01-12 |
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