WO2013053242A1 - 多接入点校准方法及装置 - Google Patents
多接入点校准方法及装置 Download PDFInfo
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- WO2013053242A1 WO2013053242A1 PCT/CN2012/076902 CN2012076902W WO2013053242A1 WO 2013053242 A1 WO2013053242 A1 WO 2013053242A1 CN 2012076902 W CN2012076902 W CN 2012076902W WO 2013053242 A1 WO2013053242 A1 WO 2013053242A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
Definitions
- CoMP Coordinated Multi-Point
- the present invention relates to the field of communications, and in particular to a multi-access point calibration method and apparatus.
- BACKGROUND OF THE INVENTION As people's requirements for future communications continue to increase, cell edge spectrum efficiency is more and more important. How to improve the transmission quality and throughput of cell edges has become a subject of competition research.
- Coordinated Multi-Point (CoMP) technology utilizes antennas of multiple access points for cooperative transmission and reception.
- One or more access points are set under one cell, and multiple points of CoMP cooperation may be from one cell.
- the multiple access points may also be multiple access points from multiple cells, where the cell includes the primary cell and the coordinated cell of the terminal.
- CoMP can effectively solve the interference problem at the edge of the cell, thereby improving the capacity and reliability of the wireless link. Therefore, CoMP technology is introduced into the LTE-A system as a key technology.
- the present invention provides a method and apparatus for calibrating multiple access points, so as to at least solve the problem that the data transmitted jointly by different access points have a parameter difference between the access points, and the coherent transmission cannot be performed between the access points, thereby causing system performance. Reduced problems.
- the embodiment of the invention provides a multi-access point calibration method.
- the method includes: receiving, by the cell, a parameter of a downlink channel of multiple access points fed back by the user equipment UE, where the parameter includes one of the following: time, phase, amplitude, time and amplitude, phase, and amplitude; calculating multiple access according to parameters of the downlink channel The parameter difference between the uplink channel and the downlink channel of the point; the multiple access points are calibrated according to the parameter difference.
- the method further includes: the cell configuring the UE to measure the downlink channel.
- the cell configuration UE measures the downlink channel including: In the case that multiple access points are not self-calibrated, the cell configuration UE measures the downlink channel of all antenna ports.
- the parameters of the downlink channel that the cell receives the feedback from the UE include: The cell receives the parameters of the downlink channel of all the antenna ports that the UE feeds back through one of the following modes: quantization into a codebook, feedback the downlink channel matrix itself, and feedback main feature information of the downlink channel matrix.
- Calculating the parameter difference between the uplink channel and the downlink channel according to the downlink channel parameter includes: the cell measures the parameter of the uplink channel of all the antenna ports; the cell calculates the uplink channel according to the parameters of the uplink channel of all the antenna ports and the parameters of the downlink channel of all the antenna ports. The difference between the parameters of the downlink channel and the downlink channel.
- the cell configuration UE measures the downlink channel, including: in a case where the multiple access point has self-calibrated, the cell configuration UE measures downlink of one or more antenna ports of all antenna ports of each access point of the multiple access points. channel.
- the parameter that the cell receives the downlink channel fed back by the UE includes: in a case where the cell configures the UE to measure the downlink channel of one of the antenna ports of each access point of each access point, the cell receives the antenna port that the UE feeds back through one of the following modes: Parameters of the downlink channel: feedback the downlink channel matrix itself, the main characteristic information of the feedback downlink channel matrix, and the phase of the feedback single-port downlink channel.
- Calculating the parameter difference between the uplink channel and the downlink channel according to the downlink channel parameter includes: the cell measures a parameter of an uplink channel of one or more antenna ports of each access point; the cell according to one or more antenna ports of each access point The parameters of the uplink channel and the parameters of the downlink channel of one or more antenna ports of each access point calculate the parameter difference between the uplink channel and the downlink channel.
- the parameter of the cell measuring the uplink channel of one or more antenna ports of each access point includes: a signal that is sent by the cell at a time when the downlink signal of the downlink channel is adjacent, as an uplink signal of the uplink channel; the cell measures the uplink signal, and obtains each Parameters of the upstream channel of one or more antenna ports of the access point.
- the parameters of the cell measuring the uplink channel of one or more antenna ports of each access point include: The cell measures parameters of the uplink channel of the same UE at one or more antenna ports of each access point at the same time.
- the parameters of the cell measuring the uplink channel of one or more antenna ports of each access point include: Each access point processes the uplink channel the same.
- the cell calculates a parameter difference between the uplink channel and the downlink channel according to parameters of an uplink channel of one or more antenna ports of each access point and parameters of a downlink channel of one or more antenna ports of each access point, including: When the UE feeds back the downlink channel matrix itself or feeds back the main channel information of the downlink channel matrix to feed back the parameters of the downlink channel of the antenna port, the cell will be used to indicate the parameters of the uplink channel of one or more antenna ports of each access point.
- the uplink channel matrix is transposed to obtain an equivalent downlink channel matrix; the cell compares the equivalent downlink channel matrix with the downlink channel matrix fed back by the UE; and the cell calculates the parameter difference between the uplink channel and the downlink channel according to the comparison result.
- the cell calculates a parameter difference between the uplink channel and the downlink channel according to parameters of an uplink channel of one or more antenna ports of each access point and parameters of a downlink channel of one or more antenna ports of each access point, including: When the UE quantizes the parameters of the downlink channel of the codebook feedback antenna port, the cell transposes the uplink channel matrix for indicating the parameters of the uplink channel of one or more antenna ports of each access point, and obtains The downlink channel matrix is calculated; the cell calculates the quantized codebook based on the equivalent downlink channel matrix; the cell compares the codebook fed back by the UE with the codebook calculated by the cell based on the equivalent downlink channel matrix; the cell calculates the uplink channel according to the comparison result.
- the parameter difference of the downlink channel calculates a parameter difference between the uplink channel and the downlink channel according to a parameter of an uplink channel of one or more antenna ports of each access point and a parameter of a downlink channel of one or more antenna ports of each access point, including: a cell Only one parameter difference between the uplink channel and the downlink channel is calculated for each access point.
- the cell configuration UE measures the downlink channel including: In the case that the multiple access points have been self-calibrated, the cell configuration UE measures the downlink channel of one or more of the antenna ports of the multiple access points.
- the cell configuring the UE to measure the downlink channel of one or more of the antenna ports of the multiple access points includes: the cell configuration UE measures the precoding information, where the precoding information is that the UE is based on the UE and the multiple access points. The channel is calculated, and the channel is measured according to the downlink reference signal sent by multiple access points. Before calculating the parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameter of the downlink channel, the method further includes: the cell obtaining, according to the uplink reference signal, a parameter of the uplink channel between the UE and the multiple access point; the cell according to the uplink channel And using the channel reciprocity to obtain the parameters of the downlink channel.
- Calculating the parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameters of the downlink channel including: calculating the uplink channel and the downlink channel of the multiple access point according to the precoding information and the parameters of the downlink channel obtained by using the channel dissimilarity The parameter is poor.
- Calculating the parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameters of the downlink channel includes: Step A: selecting a first parameter difference and a second parameter difference in the possible parameter difference interval, respectively obtaining the first parameter Poor Corresponding first corrected downlink channel and second corrected downlink channel corresponding to the second parameter difference; Step B, based on precoding information in the first corrected downlink channel and the second corrected downlink channel Determining that the first corrected downlink channel is closer to the real downlink channel; Step C, determining the first parameter difference as the calculated parameter difference; and iterating from step A to step C, obtaining the calculated parameter difference.
- the cell configuration UE measurement precoding information includes: a cell configuration UE measurement PMI, where the PMI is calculated by the UE according to a channel between itself and multiple access points of the same cell, and the channel is a CRS sent according to multiple access points. Measured.
- the method further includes: the cell obtaining the parameter of the uplink channel between the UE and the multiple access point according to the uplink listening signal SRS; The upstream channel and the channel reciprocity are used to obtain the parameters of the downlink channel. Calculating the parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameters of the downlink channel, including:
- the PMI calculates the parameter difference between the uplink channel and the downlink channel of the multiple access points by using the parameters of the downlink channel obtained by using the channel reciprocity.
- Calculating the parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameters of the downlink channel includes: Step A: selecting a first parameter difference and a second parameter difference in the possible parameter difference interval, respectively obtaining the first parameter a first corrected downlink channel corresponding to the difference and a second corrected downlink channel corresponding to the second parameter difference; Step B, based on the PMI, in the first corrected downlink channel and the second corrected downlink channel Determining that the first corrected downlink channel is closer to the real downlink channel; Step C, determining the first parameter difference as the calculated parameter difference; and iterating from step A to step C, obtaining the calculated parameter difference.
- Embodiments of the present invention provide a multiple access point calibration apparatus.
- the method includes: a receiving module, configured to receive a parameter of a downlink channel fed back by the user equipment UE; and a calculating module, configured to calculate a parameter difference between the uplink channel and the downlink channel according to the downlink channel parameter; and the calibration module is set to be connected according to the parameter difference In the point of calibration.
- the cell accurately calculates the parameter difference between different access points, and then calibrates the multiple access points according to the parameter difference, thereby ensuring good coherent transmission between the access points, and further Guarantee system performance.
- FIG. 1 is a flow chart of a multiple access point calibration method according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing the structure of a multiple access point calibration apparatus according to an embodiment of the present invention.
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
- FIG. 1 is a flowchart of a multiple access point calibration method according to an embodiment of the present invention.
- Step S102 The cell receives a parameter of a downlink channel of the multiple access point fed back by the UE, where the parameter includes one of the following: time, phase, amplitude, time and amplitude, phase, and amplitude.
- Step S104 Calculate a parameter difference between the uplink channel and the downlink channel of the multiple access points according to the parameters of the downlink channel.
- Step S106 calibrating the multiple access points according to the parameter difference.
- the data jointly sent by different access points has a parameter (where the key parameters are phase), which causes a good coherent transmission between the access points, thereby causing a decrease in system performance.
- the cell accurately calculates the parameter difference between different access points, and then calibrates the multiple access points according to the parameter difference, thereby ensuring good coherent transmission between the access points, and further Guarantee system performance.
- the present invention also needs to accurately configure the UE to measure the downlink channel, and configure the UE from two aspects: the multiple access points are not self-calibrated and the multiple access points have been self-calibrated.
- the downlink channel is measured for detailed description.
- the cell needs to accurately calculate and calibrate the parameter difference of the downlink channel of all antenna ports of the different access points. Therefore, the cell configuration UE measures the downlink channel of all the antenna ports, and then the UE feeds back the parameters of the downlink channel of all the antenna ports to the cell by quantizing the codebook or the feedback downlink channel matrix itself or the main characteristic information of the feedback downlink channel matrix. .
- the cell measures the parameters of the uplink channel of all antenna ports. Then, the cell calculates the parameter difference between the uplink channel and the downlink channel according to the parameters of the uplink channel of all antenna ports and the parameters of the downlink channel of all antenna ports.
- the cell In the case where multiple access points have been self-calibrated, the cell only needs to select a part of the antenna ports in each access point of the different access points to accurately calculate and calibrate the parameter difference of the downlink channel. Therefore, cell configuration
- the UE measures the downlink channel of one or more of the antenna ports. Then, the UE feeds back parameters of the downlink channel of all antenna ports to the cell. It should be noted that, when the UE configures the UE to measure the downlink channel of multiple antenna ports in all the antenna ports, the UE may quantize the codebook or feed back the downlink channel matrix itself or feed back the main feature information of the downlink channel matrix.
- the cell feeds back the parameters of the downlink channel of all antenna ports.
- the cell configures the UE to measure the downlink channel of one of the antenna ports
- the UE feeds back the antenna port by feeding back the downlink channel matrix itself or feeding back the main characteristic information of the downlink channel matrix or the phase value of the feedback single port.
- the parameters of the downstream channel
- the cell measures parameters of the uplink channel of one or more antenna ports.
- the cell calculates a parameter difference between the uplink channel and the downlink channel according to the parameters of the uplink channel of the one or more antenna ports and the parameters of the downlink channel of the one or more antenna ports.
- the cell may use the signal sent at the time when the downlink signal of the downlink channel is adjacent to be the uplink signal of the uplink channel; the cell measures the uplink signal to obtain the uplink channel of one or more antenna ports of each access point. Parameters. More preferably, the cell may use the reference signal of the adjacent uplink and downlink time slots of the downlink signal as the uplink signal. In addition, in the above measuring step, the cell measures the parameters of the uplink channel of the same UE at one or more antenna ports of each access point at the same time. In the above measurement steps, each access point processes the uplink channel in the same way.
- the cell in case the UE feeds back the parameters of the downlink channel of the antenna port by feeding back the downlink channel matrix itself or feeding back the main feature information of the downlink channel matrix, the cell will be used to indicate one or more of each access point.
- the uplink channel matrix of the parameters of the uplink channel of the antenna port is transposed to obtain an equivalent downlink channel matrix; the cell compares the equivalent downlink channel matrix with the downlink channel matrix fed back by the UE; the cell calculates the uplink channel and the downlink channel according to the comparison result.
- the parameter is poor.
- the cell transposes the uplink channel matrix for indicating the parameter of the uplink channel of one or more antenna ports of each access point. Obtaining an equivalent downlink channel matrix; the cell calculates a quantized codebook based on the equivalent downlink channel matrix; the cell compares the codebook fed back by the UE with the codebook calculated by the cell based on the equivalent downlink channel matrix; the cell calculates according to the comparison result The parameter difference between the uplink channel and the downlink channel. In the above calculation step, the cell calculates only the parameter difference of one uplink channel and the downlink channel for each access point.
- Preferred Embodiment 1 This preferred embodiment 1 describes the case where each RRU/access point does not perform antenna self-calibration. .
- the serving cell configures the granularity of the antenna port and phase feedback of each RRU/access point measured by the UE, and sends a downlink reference signal on the corresponding antenna port.
- Serving Cell Configuration The UE measures all antenna ports of each RRU/access point.
- the frequency domain granularity of the phase feedback of the above configuration may be RE (Resource Element), or RB (Resource Block), or SubBand, or the entire cell system bandwidth, or other frequency domain units.
- the downlink reference signal may be a CSI-RS (Channel Status Information Reference Signal), and each RRU/access point is multiplexed and transmitted by frequency division, or code division, or time division, or a combination of the first three modes.
- CSI-RS Channel Status Information Reference Signal
- the UE selects an antenna, which is assumed to be the first receiving antenna, performs reception and measurement of the frequency domain channel response with each RRU/access point, and sets the phase value of the frequency domain channel response. Feedback to the service cell.
- Each RRU/access point receives the above reference signal according to the configuration of the serving cell, and calculates a phase value of the frequency domain channel response.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces.
- the reference signal may be a Sounding Reference Signal (SRS).
- SRS Sounding Reference Signal
- the serving cell calculates the reciprocity error of the uplink and downlink channels of each RRU/access point according to the phase of the downlink channel corresponding to each RRU fed back by the UE and according to the phase calculated by the cell based on the uplink matrix matrix.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces.
- each RRU/access point and each antenna port can calculate the uplink and downlink channel reciprocity, ..., , , , , , , ,
- Each RRU/access point performs antenna self-calibration.
- the above self-calibration method may use an existing calibration network based method or a non-calibration network based method.
- the serving cell triggers a CoMP UE to perform auxiliary calibration, and configures the time and number of measurements by the UE, and the measured granularity of the antenna port and phase feedback of each RRU/access point.
- the triggering manner may be that the serving cell triggers once, and then the UE measures and feeds back at the measurement moment of the subsequent configuration. It may also be that the serving cell triggers once, and then the UE measures and feeds back at the subsequent N configured measurement moments.
- the serving cell configures the UE to measure one of the antenna ports of each RRU/access point, assuming the first antenna port of each RRU/access point.
- the serving cell configures the UE to measure all antenna ports of each RRU/access point.
- the frequency domain granularity of the phase feedback of the above configuration may be RE (Resource Element), or RB (Resource Block), or SubBand, or the entire cell system bandwidth, or other frequency domain units.
- Each RRU/access point transmits a downlink reference signal at the measurement time and port of the serving cell configuration in the above step 2.
- the downlink reference signal may be a CSI-RS (Channel Status Information Reference Signal), and each RRU/access point is multiplexed and transmitted by frequency division, or code division, or time division, or a combination of the first three modes.
- CSI-RS Channel Status Information Reference Signal
- the UE selects an antenna, which is assumed to be the first receiving antenna, performs reception and measurement of the frequency domain channel response with each RRU/access point, and sets the phase value of the frequency domain channel response. Feedback to the service cell.
- the UE transmits a reference signal on the first antenna.
- the serving cell sends the configuration information of the UE in step 2 to each RRU/access point, and each RRU/access point receives the reference signal according to the configuration of the serving cell, and calculates the phase value of the frequency domain channel response.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces.
- the reference signal may be a Sounding Reference Signal (SRS).
- SRS Sounding Reference Signal
- the serving cell calculates the reciprocity error of each RRU/access point uplink and downlink channel according to the downlink channel phase corresponding to each RRU fed back by the UE, and according to the phase calculated by the cell based on the uplink road matrix measurement. Since self-calibration is performed in the above step (1), only one uplink and downlink channel reciprocity error is calculated for each RRU.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces.
- Each RRU/access point performs antenna self-calibration.
- the above self-calibration method can use an existing calibration network based method or a non-calibration network based method.
- the serving cell triggers a CoMP UE to perform auxiliary calibration, and configures the time and number of measurements by the UE, and the measured granularity of the antenna port and phase feedback of each RRU/access point.
- the serving cell may be triggered once, and then the UE measures and feeds back at the measurement moment of the subsequent configuration. It may also be that the serving cell triggers once, and then the UE measures and feeds back at the subsequent N configured measurement moments.
- the serving cell configuration UE measures one of the antenna ports of each RRU/access point, assuming the first antenna port of each RRU/access point.
- the serving cell configuration UE measures all antenna ports of each RRU/access point.
- the frequency domain granularity of the phase feedback of the above configuration may be RE ( Resource Element ) or RB
- Each RRU/access point transmits a downlink reference signal at the measurement time and port of the serving cell configuration in the above step 2.
- the downlink reference signal may be a CSI-RS (Channel Status Information Reference Signal), and each RRU/access point is multiplexed and transmitted by frequency division, or code division, or time division, or a hybrid manner of the first three modes.
- CSI-RS Channel Status Information Reference Signal
- the UE selects one or more receiving antennas, and the preferred solution is to select one receiving antenna.
- the frequency domain channel response between each RRU/access point is received and measured.
- the specific measurement and calculation may be implemented as follows:
- the UE may also measure a frequency domain channel response between the first receiving antenna and all antenna ports of each RRU/access point, and select a precoding vector based on the frequency domain channel response calculation. Or feedback to the serving cell.
- the UE may also measure the frequency domain channel response between the first receiving antenna and the antenna ports of each RRU/access point and select precoding based on the frequency domain channel response calculation.
- the vector is fed back to the serving cell.
- the precoding vector can be selected from a predefined set of codebooks, that is, a corresponding Precoding Matrix Indicator (PMI) is selected, and the feedback PMI indicates its corresponding precoding vector.
- the codebook set can reuse a codebook set based on Multi-Input-Multi-Output (MIMO).
- MIMO Multi-Input-Multi-Output
- the UE If the UE is configured to use one receiving antenna in step (4), the UE transmits a reference signal on the antenna; if the step (4) is configured to use more receiving antennas, the UE sends a reference on the corresponding multiple antennas. signal.
- the serving cell sends the configuration information of the UE in step 2 to each RRU/access point, and each RRU/access point receives the reference signal according to the configuration of the serving cell, calculates a phase value of the frequency domain channel response, and is based on the frequency.
- the domain channel response calculation selects a precoding vector.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces.
- the reference signal may be a Sounding Reference Signal (SRS).
- the serving cell calculates the reciprocity error of the uplink and downlink channels of each RRU/access point according to the downlink channel phase or PMI corresponding to each RRU fed back by the UE, and according to the phase or PMI calculated by the cell based on the uplink road matrix measurement.
- the interface between the foregoing serving cell and each RRU/access point may be an X2 interface or other interfaces. Since self-calibration is performed in the above step (1), only one uplink and downlink channel reciprocity error is calculated for each RRU.
- each RRU/access point performs antenna self-calibration.
- An embodiment that is based on joint precoding of multiple access points Take two RRUs as an example and set them as RRU1 and RRU2. The same applies to scenarios larger than two RRUs. In the embodiment, the two terms RRU and access point are a concept.
- Step 1. Each RRU/access point performs antenna self-calibration.
- the above self-calibration method can use an existing calibration network based method or a non-calibration network based method.
- the cell is configured with one or more UEs for auxiliary calibration.
- the multiple access point calibration methods are described in detail by using schemes 1 and 2. plan 1 :
- the UE is configured to feed back multiple pre-coding information of the RRU.
- the multiple RRUs may be from the same cell or from different cells.
- the precoding information may be global precoding information of multiple RRUs (for example, a global codebook)
- PMI JT pre-coding information of a single RRU
- pre-coding information of a single RRU for example, a separate codebook for each RRU
- information about the RRU for example, phase difference information PCI between RRUs
- the CSI-RS resource information may include CSI-RS resource information and/or an RRU identifier and/or a cell identifier corresponding to the target RRU;
- the CSI-RS resource information and/or the RRU identifier and/or the cell identifier corresponding to the target RRU may be included.
- the difference between the two RRUs is measured;
- the normal RANK and PMI measurements for scheduling purposes can be different from this, and are still configured according to the actual channel conditions;
- Trigger and measurement mode event trigger, cycle/single report/multiple report, etc.
- the UE selection condition may be: Based on the channel fading, the UE that receives the two target RRUs is stronger and the other UEs with weaker RRU signals are received. The weaker RRU has a smaller impact on the UE's computational PMI.
- the UE is configured to measure the CSI-RS (Channel Status Information Reference Signal) sent by the two RRUs, and the channel H obtained by the UE based on the CSI-RS,
- CSI-RS Channel Status Information Reference Signal
- the UE obtains PM1 ⁇ 2 S based on H CSI-RS ⁇ and feeds back to the cell;
- the cell is based on the uplink reference signal (for example, SRS), and respectively obtains the uplink channel corresponding to the two RRUs, and uses the channel reciprocity to obtain the corresponding downlink channel as " s
- phase estimation decision is implemented by using one of the following methods or a combination of multiple methods, and the phase difference ⁇ is finally estimated by multiple iterations: mode 1, set, 1 ⁇ 2 corresponding precoding matrix W_PM., then W— ⁇ ! ⁇ is more relevant to ⁇ , for example >
- W t W_P i
- PM3 ⁇ 4 2 (k2) ⁇ 1 ⁇ , if kl ⁇ k2, ⁇ 1 is considered to be closer to ⁇ 8. Sorting the above priorities from high to low means: According to the principle of ⁇ measurement selection, the higher the priority, the better the precoding matrix corresponding to ⁇ ; the way 6, the frequency domain and/or the time domain are multiple and 1 2 respectively ⁇ , ⁇ 3 ⁇ 43 ⁇ 4 2 . Based on ⁇ : ⁇ ( ⁇ ) get a collection of ⁇ sorted by priority from high to low ⁇ ⁇ 1 (I ⁇ 1 ⁇ (2), PMl (kl),...
- Method 2 Simultaneously perform phase ⁇ and amplitude estimation to obtain the estimated phase estimation value P, and separately correct the phase ⁇ ; obtain the estimated amplitude estimation value, separately correct the amplitude ⁇ %; obtain the estimated phase estimation value p and the amplitude estimation
- the amplitude and phase combination of the traversal can be selected simultaneously using the QAM constellation point mapping rule. ⁇ and ⁇ 2 belong to the estimated phase
- phase estimation decisions are implemented in one or a combination of multiple ways, and the phase difference is finally estimated by iterating through multiple iterations.
- Mode 1 set the precoding matrix W clothPM3 ⁇ 4 : corresponding to ⁇ 3 ⁇ 4, then if 3 ⁇ 4 ⁇ _ ⁇ 8 is more strongly related to 8 ⁇ $, for example, H ⁇ 3 ⁇ 4 ⁇ F 1 ⁇ 2 E
- ⁇ 1 is closer to ⁇ , and
- ⁇ 4i is closer to ⁇ ;
- mode 2 let precoding matrix W_PM3 ⁇ 4 E corresponding to RMi aErust get precoding matrix based on f% 3 ⁇ 4 to E1 ⁇ 2 : 2 to get precoding matrix 3 ⁇ 4 2: , then if 3 ⁇ 4 ⁇ _ ⁇ «3 ⁇ 4 ⁇ 3 ⁇ 4 and more relevant, e.g.
- Sorting the above priorities from high to low means: According to the principle of measurement selection, the higher the priority, the better the corresponding precoding matrix; mode 7, because the deviation between RRU1 and RRU2 is systematic deviation, that is, as long as The UE that satisfies the UE selection condition of the above step (2) may select a plurality of UEs at the same time.
- the above scheme can perform measurement estimation on multiple UEs at the same time, thereby obtaining better estimation results.
- Scheme 2 Based on scheme 1, this scheme 2 provides a more refined multi-access point calibration method that uses PMI in precoding information to perform multiple access point calibration.
- the PMI is obtained by the UE based on CRS measurements of multiple RRUs/access points in the same cell.
- the UE selection condition may be: Based on the channel fading, the signal that receives the two target RRUs is selected to be stronger and the other UEs with weaker RRU signals are received. The weaker RRU has a smaller impact on the UE's computational PMI.
- the UE obtains W based on the ⁇ measurement and feeds back to the cell; (3) The cell obtains the uplink channels s3 ⁇ 4s_s and ss corresponding to the two RRUs based on the uplink SRS.
- the corresponding downlink channel is obtained by channel reciprocity as H 3 ⁇ 4s H ⁇ 3 ⁇ 4s .
- the equivalent synthetic channel is:
- PMI 2 (k2 ⁇ PMi UE , if kl ⁇ k2, then ⁇ 1 is closer to ⁇ ⁇ .
- the above priority is ranked from high to low: According to the principle of ⁇ measurement selection, the higher the priority, the higher the precoding matrix corresponding to ⁇ Good; mode 6, based on the frequency domain and / or time domain multiple 2 and 2 respectively get multiple f3 ⁇ 4 : i , f3 ⁇ 4 2 .
- PM3 ⁇ 4 2 (k2) ⁇ ⁇ ⁇ counts N times, if ⁇ ⁇ ⁇ ⁇ , then ⁇ 1 is considered closer. Sorting the above priorities from high to low means: According to the principle of ⁇ measurement selection, the higher the priority, the better the precoding matrix corresponding to ⁇ . Since the deviation between RRU1 and RRU2 is a systematic deviation, that is, as long as it is a UE that satisfies the UE selection condition of the above step (2), a plurality of them can be selected at the same time. The above solution can perform measurement estimation on multiple UEs at the same time, thereby obtaining better estimation results.
- Method 2 Simultaneously perform phase ⁇ and amplitude estimation to obtain an estimated phase estimation value, and separately correct the phase ⁇ ; or, obtain an estimated amplitude estimation value, and separately correct the amplitude; or, obtain an estimated phase estimation value and amplitude estimation.
- the value Q simultaneous phase ⁇ ⁇ and amplitude correction. Search or estimate and ", so that ⁇ is approximately equal to e within the tolerance of the error, while making "approximate to ⁇ within the allowable range of error.
- the amplitude and phase combination of the traversal can be selected simultaneously using the QAM constellation point mapping rule.
- mode 5 is based on obtaining ⁇ ⁇ sorted by priority from high to low. set fPMl gi (l) t ⁇ ⁇ (2), ..., PMI i (kl), ... ⁇ based on 2 obtained according to priority level PML ordered set ⁇ PMl & 2 (1), ⁇ 3 ⁇ 4 2 (2), ...
- H (i) gets the set sorted by priority from high to low (1), ⁇ (2) ⁇ ⁇ 1 (ki) s ... ⁇ and based on getting sorted by priority from highest to lowest
- PM 2 (k2): ⁇ ⁇ .
- Counting N times, if ⁇ ) ⁇ it is considered that ⁇ ⁇ is closer to ⁇ 8 and ⁇ .2 is closer to ⁇ .4. Sorting the above priorities from high to low means: According to the principle of ⁇ measurement selection, the higher the priority, the better the corresponding precoding matrix; Mode 7, because the deviation between RRU1 and RRU2 is a systematic deviation, that is, as long as it is a UE that satisfies the UE selection condition of the above step (2), a plurality of them can be selected at the same time.
- the above scheme can perform measurement estimation on multiple UEs at the same time, thereby obtaining better estimation results.
- the precoding vector may be selected from a predefined set of codebooks, that is, a corresponding Precoding Matrix Indicator (PMI) is selected, and the feedback PMI indicates its corresponding precoding vector.
- the codebook set can be reused for a codebook set based on Multi-Input-Multi-Output (MIM0).
- Step 3 Adjust the parameters of each RRU transmission signal based on the reciprocity error of the uplink and downlink channels calculated by each RRU/access point.
- Embodiments of the present invention provide a multiple access point calibration apparatus, which can be used to implement the above multiple access point calibration method.
- 2 is a structural block diagram of a multiple access point calibration apparatus according to an embodiment of the present invention.
- the receiving module 22, the calculation module 24, and the calibration module 26 are included.
- the receiving module 22 is configured to receive a parameter of the downlink channel fed back by the UE.
- the calculating module 24 is connected to the receiving module 22, and configured to calculate a parameter difference between the uplink channel and the downlink channel according to the downlink channel parameter received by the receiving module 22; the calibration module 26 And connected to the calculation module 24, configured to calibrate the multiple access points according to the parameter difference calculated by the calculation module 24.
- a multi-access point calibration method and apparatus are provided.
- the cell accurately calculates the parameter difference between different access points, and then calibrates the multiple access points according to the parameter difference, thereby ensuring good coherent transmission between the access points, thereby ensuring the system performance.
- Industrial Applicability The technical solution of the present invention has industrial applicability.
- the cell accurately calculates the parameter difference between different access points, and then calibrates the multiple access points according to the parameter difference, thereby ensuring good coherent transmission between the access points, thereby ensuring the system. performance.
- modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.
- the invention is not limited to any specific combination of hardware and software.
- the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.
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IN2792CHN2014 IN2014CN02792A (zh) | 2011-10-10 | 2012-06-14 | |
EP12839707.2A EP2755435B1 (en) | 2011-10-10 | 2012-06-14 | Multi-access point calibration method and device |
RU2014117370/07A RU2581657C2 (ru) | 2011-10-10 | 2012-06-14 | Способ и устройство для калибровки точек многостанционного доступа |
BR112014008313-4A BR112014008313B1 (pt) | 2011-10-10 | 2012-06-14 | Método e aparelho para a calibração de múltiplos pontos de acesso |
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CN2011103049266A CN103037519A (zh) | 2011-10-10 | 2011-10-10 | 多接入点校准方法及装置 |
CN201110304926.6 | 2011-10-10 |
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CN104125604A (zh) * | 2013-04-24 | 2014-10-29 | 中兴通讯股份有限公司 | 上下行信道互异性的校准、校准处理方法及装置 |
CN104684072B (zh) * | 2013-11-26 | 2018-03-16 | 华为技术有限公司 | 实时定位的方法、装置、ap和终端 |
CN105379386B (zh) * | 2014-04-22 | 2019-03-26 | 华为技术有限公司 | 联合通道校正方法、装置及管理设备 |
CN107872262B (zh) * | 2016-09-19 | 2021-11-09 | 中兴通讯股份有限公司 | 提高数据赋形增益方法及装置、基站、通信系统 |
CN107979551B (zh) * | 2016-10-25 | 2022-04-15 | 中兴通讯股份有限公司 | 一种信道误差获取方法及装置 |
US10117207B2 (en) * | 2016-12-09 | 2018-10-30 | Qualcomm Incorporated | Over-the-air phase synchronization for reciprocity-based comp joint transmission |
CN110299950B (zh) * | 2018-03-22 | 2022-05-06 | 中兴通讯股份有限公司 | 一种射频通道校正方法和装置 |
CN114915986A (zh) * | 2021-02-09 | 2022-08-16 | 维沃移动通信有限公司 | 信号参数上报方法、装置及设备 |
WO2024010108A1 (ko) * | 2022-07-05 | 2024-01-11 | 엘지전자 주식회사 | 무선 통신 시스템에서 협력 전송을 수행하기 위한 방법 및 이를 위한 장치 |
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IN2014CN02792A (zh) | 2015-07-03 |
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JP2014531171A (ja) | 2014-11-20 |
EP2755435A4 (en) | 2015-06-24 |
BR112014008313B1 (pt) | 2022-07-05 |
RU2581657C2 (ru) | 2016-04-20 |
EP2755435A1 (en) | 2014-07-16 |
CN103037519A (zh) | 2013-04-10 |
EP2755435B1 (en) | 2018-02-28 |
RU2014117370A (ru) | 2015-11-20 |
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