WO2016066036A1 - Procédé et dispositif de rétroaction et d'acquisition d'informations d'état de canal - Google Patents

Procédé et dispositif de rétroaction et d'acquisition d'informations d'état de canal Download PDF

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Publication number
WO2016066036A1
WO2016066036A1 PCT/CN2015/092465 CN2015092465W WO2016066036A1 WO 2016066036 A1 WO2016066036 A1 WO 2016066036A1 CN 2015092465 W CN2015092465 W CN 2015092465W WO 2016066036 A1 WO2016066036 A1 WO 2016066036A1
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csi
fed back
pilot
pilot signal
resource
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PCT/CN2015/092465
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English (en)
Chinese (zh)
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陈润华
高秋彬
拉盖施
李辉
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电信科学技术研究院
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a method and device for feeding back and obtaining channel state information.
  • the base station antenna arrays are generally horizontally aligned.
  • the base station transmitter beam can only be adjusted in the horizontal direction, while the vertical direction is a fixed downtilt angle. Therefore, various beamforming and precoding techniques are performed based on the horizontal channel information. In fact, since the wireless signal is three-dimensionally propagated in space, the method of fixing the downtilt angle does not optimize the performance of the system.
  • 3D MIMO Multiple Input Multiple Output
  • the number of antennas on the base station side is very large, and it is a two-dimensional antenna structure, for example, 8, 16, 32, 64. Antennas, etc.
  • the industry has emerged an active antenna that can independently control each array.
  • the antenna array is enhanced from the current two-dimensional horizontal arrangement to the three-dimensional horizontal arrangement and vertical alignment. This antenna array makes the dynamic adjustment of the beam in the vertical direction possible.
  • the first method is to use a codebook-based reporting method, for example, the LTE (Long Term Evolution) version 8 (Rel-8) system.
  • LTE Long Term Evolution
  • Rel-8 Long Term Evolution version 8
  • the existing scheme is an eNB (evolved Node B) to configure a CSI-RS (Channel State Information Reference Signal).
  • the reference signal)) resource the antenna array has 16 antenna ports, corresponding to the total number of antennas, the UE feeds back a CSI process.
  • the feedback codebook must correspond to the total number of antennas, that is, corresponding to 16 antennas, so that the codebook must include many codewords to satisfy sufficient accuracy, and a new code is designed corresponding to the new number of antennas (16 antennas). This is also a very complicated standardization work, and at this time, the UE needs to choose among many codewords. The best codeword for the channel can be reflected, and the computational and feedback overhead of the feedback is also large.
  • the three-dimensional beamforming antenna unit adopts an active antenna independently controlled by each array.
  • the antenna power amplifier is integrated with the antenna unit.
  • the transmission power of each antenna unit is very low. .
  • each antenna unit sends a CSI-RS, its transmission power will be very low, and the terminal may not be able to achieve correct channel estimation and data transmission.
  • the virtualization or sectorization approach solves this problem, but after the antenna is virtualized, the terminal cannot distinguish between multiple antenna units, and thus multiple antenna units cannot be used to achieve efficient multi-antenna transmission.
  • Each CSI-RS sent by each antenna unit will cause the terminal to perform channel estimation for each antenna port, and perform CSI calculation based on the channel estimation value.
  • the complexity of the terminal when the number of antenna units is large Very high, difficult to achieve.
  • Manner 2 The eNB configures two CSI-RS resources, and the number of ports of each resource corresponds to the number of antennas in the vertical dimension and the horizontal dimension.
  • each resource has 4 ports, corresponding to two CSI-RS resources, and each CSI-RS resource can be used to feed back one.
  • Channel states of different dimensions such as horizontal and vertical dimensions, such that the UE feeds back two CSI processes, one for each resource.
  • Each CSI-RS resource is sent from a group of antennas, and the UE measures each CSI-RS resource and feeds back its corresponding CSI, which is called a CSI process.
  • Each CSI process in the existing standard is defined as being associated with one CSI.
  • the CSI feedback content in each CSI process is independently measured by its corresponding CSI-RS resource, including RI (Rank Indication), PMI (Precoding Matrix Indicator) and CQI ( Channel Quality Indicator, RI reflects the number of code streams that the UE can support in the downlink.
  • the PMI reflects the coding matrix in a codebook fed back by the UE.
  • the CQI reflects that the RI/PMI is applied to the MIMO encoding and the UE can receive the code. Signal strength.
  • the calculation of CQI must be based on the feedback RI/PMI, which can be a representation of the strength of a signal, such as: SINR (Signal to Interference plus Noise Ratio), or MCS (modulation and coding scheme) Encoding level), or other characteristics.
  • the eNB obtains downlink 3D-MIMO shaped information according to the CSI of the vertical dimension and the horizontal dimension fed back by the UE, and obtains a CQI value for downlink adjustment.
  • Each CSI process is independently calculated and cannot reflect the overall channel state information after 3D-MIMO shaping.
  • the vertical dimension CSI process is measured by the vertical dimension CSI-RS resource
  • the horizontal dimension CSI process is determined by The CSI-RS resource measurement in the horizontal dimension is obtained.
  • the eNB After receiving the CSI process in the vertical and horizontal dimensions, the eNB cannot directly apply to the 3D-MIMO shape, but must The CSI process is further processed to obtain the shaping information and CQI information on the 3D-MIMO two-dimensional matrix, which not only increases the complexity of the eNB, but also reduces the accuracy of the 3D-MIMO shaping.
  • the existing CSI technology solution in the 3D-MIMO technology based on the traditional feedback scheme, measures a CSI-RS resource, and reports a CSI process through a codebook, and the calculation difficulty and feedback overhead of the UE are large. Not conducive to implementation.
  • the embodiment of the present application provides a feedback and acquisition method and a device for channel state information, which are used to reduce the feedback overhead of the UE, reduce the difficulty of CSI feedback processing on the UE side, and make the feedback and acquisition of the channel state information more convenient and save resources.
  • the acquired channel state information can reflect the overall channel state information after 3D-MIMO shaping.
  • a method for obtaining channel state information (CSI) provided by the embodiment of the present application includes: transmitting, by using a first pilot resource configured for a user equipment UE, a first pilot signal to the UE; The CSI fed back by the first process configured by the UE, and the CSI fed back by the second process configured in advance for the UE, where the CSI fed back by the first process and the CSI fed back by the second process are The UE calculates the calculation based on at least the first pilot signal measurement.
  • the network side receives the CSI that is fed back by the UE through the first process and the second process, and is calculated by the UE based on at least the first pilot signal measurement, and the first pass is performed.
  • the CSI fed back by the process and the CSI fed back through the second process are calculated based on at least the first pilot signal measurement, and the channel state information of the first pilot signal is reflected from two dimensions, for example, a horizontal dimension and a vertical dimension, reflecting the 3D. MIMO-shaped overall channel state information, so that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE.
  • the UE passes The first process and the second process feedback CSI are calculated for the pilot signal measurement, which reduces the processing difficulty of the UE.
  • the number of the antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the CSI fed back by the first process is N1.
  • the number of antenna ports corresponding to the CSI fed back by the second process is N2, and the product of N1 and N2 is equal to N.
  • the CSI that is sent by the first process includes: a precoding matrix indicating PMI information; and a CSI fed back by the second process, including: PMI information.
  • the channel quality indicator CQI information wherein the CQI information is obtained by the UE based on the PMI information fed back by the first process and the PMI information fed back by the second process.
  • the CSI fed back by the first process only includes PMI information, and does not perform CQI feedback, which reduces the feedback overhead of the UE.
  • the method further includes: sending, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the UE;
  • the CSI fed back by the process and the CSI fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: the CSI fed back by the first process is The CSI calculated by the UE based on the first pilot signal measurement; the CSI fed back by the second process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the CSI fed back by the first process is calculated by the UE based on the measurement of the first pilot signal
  • the CSI fed back by the second process is that the UE is based on the first pilot signal and the second pilot.
  • the signal is jointly measured and calculated. Therefore, the CSI fed back through the first process has a certain correlation with the CSI fed back through the second process, and the channel state information of the antenna array can be reflected from two dimensions, for example, a horizontal dimension and a vertical dimension.
  • the overall channel state information after the 3D-MIMO shaping is reflected, so that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE, and the UE separately measures and calculates the CSI for a single resource in the prior art.
  • the CSI fed back through the first process and the CSI fed back through the second process jointly reflect the overall channel state information after 3D-MIMO shaping, and the base station does not need to further process the received CSI, which reduces the processing difficulty of the base station.
  • the method further includes: sending, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the UE;
  • the CSI fed back by the process and the CSI fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: the CSI fed back by the first process is The UE calculates the calculated based on the first pilot signal and the second pilot signal; the CSI fed back by the second process is that the UE is based on the first pilot signal and the second The pilot signals are jointly measured and calculated.
  • the CSI fed back by the first process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal, and the CSI fed back through the second process is also the UE based on the first guide.
  • the frequency signal and the second pilot signal are jointly measured and calculated. Therefore, the CSI fed back through the first process and the CSI fed back through the second process have a certain correlation, and the channel state information of the antenna array can be reflected from two dimensions.
  • the horizontal and vertical dimensions reflect the overall channel state information after 3D-MIMO shaping, so that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE, and the UE in the prior art.
  • the CSI fed back through the first process and the CSI fed back through the second process jointly reflect the overall channel state information after 3D-MIMO shaping, and the base station does not need to further process the received CSI.
  • the processing difficulty of the base station is reduced.
  • the CSI fed back by the first process includes: PMI information.
  • the CSI that is sent by the first process further includes: the rank indication RI information corresponding to the PMI information.
  • the CSI that is sent by the second process includes: PMI information, RI information corresponding to the PMI information, and PMI based on the second process feedback.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process
  • the second The number of antenna ports of the pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the second process.
  • a configuration period of the first pilot resource is L times of a configuration period of the second pilot resource, where L is greater than or A positive integer equal to 1.
  • the feedback period of the CSI fed back by the first process is L times of the feedback period of the CSI fed back by the second process, where L is A positive integer greater than or equal to 1.
  • the first pilot resource and the second pilot resource are a channel state information reference signal CSI-RS resource or a common reference signal CRS. Resources.
  • the method for feeding back channel state information CSI includes: determining, by the user equipment, the first pilot resource, the first process, and the second process that are configured by the network side in advance for the UE; the UE is at least based on the network.
  • the first CSI and the second CSI are calculated by the first pilot signal sent by the first pilot resource, and the UE feeds back the first CSI to the network side by using the first process, and passes the The second process feeds back the second CSI to the network side.
  • the UE calculates the CSI and the second CSI based on at least the first pilot signal measurement, where the first CSI and the second CSI are calculated based on at least the first pilot signal measurement, from two
  • the dimension reflects the channel state information of the first pilot signal, for example, the horizontal dimension and the vertical dimension, and reflects the overall channel state information after 3D-MIMO shaping, so that the base station can directly apply after receiving the CSI fed back by the UE.
  • the shaping of the 3D-MIMO is compared with the manner in which the UE reports based on the codebook in the prior art, and the UE obtains the CSI of the first process and the second process by calculating the pilot signal, thereby reducing the processing difficulty of the UE.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the first CSI is N1
  • the second The number of antenna ports corresponding to the CSI is N2
  • the product of N1 and N2 is equal to N.
  • the first CSI includes: a precoding matrix indicating PMI information; and the second CSI includes: PMI information and channel quality indication CQI information.
  • the CQI information is obtained by the UE based on PMI information in the first CSI and PMI information in the second CSI.
  • the method further includes: determining, by the UE, a second pilot resource that is configured by the network side in advance for the UE;
  • the first pilot signal sent by the first pilot resource is calculated to obtain the first CSI and the second CSI, where the UE calculates the first CSI based on the first pilot signal measurement; the UE is based on the The first pilot signal and the second pilot signal sent by the network side through the second pilot resource are jointly measured and calculated to obtain a second CSI.
  • the method further includes: determining, by the UE, a second pilot resource that is configured by the network side in advance for the UE;
  • the first pilot signal sent by the first pilot resource is calculated to obtain the first CSI and the second CSI, where the UE is sent by using the second pilot resource based on the first pilot signal and the network side.
  • the second pilot signal is jointly measured and calculated to obtain a first CSI; the UE calculates and calculates a second CSI based on the first pilot signal and the second pilot signal sent by the network side by using the second pilot resource.
  • the first CSI includes: PMI information.
  • the first CSI further includes: a rank indication RI information corresponding to the PMI information.
  • the second CSI includes: PMI information, RI information corresponding to the PMI information, and PMI information and a location based on the second CSI.
  • the CQI information obtained by the PMI information in the first CSI.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI
  • the second pilot resource is The number of antenna ports is equal to the number of antenna ports corresponding to the second CSI.
  • An apparatus for acquiring channel state information CSI includes: a first unit, configured to send a first pilot signal to the UE by using a first pilot resource configured in advance for a user equipment UE; a unit, connected to the first unit, configured to receive CSI fed back by the UE by using a first process configured in advance for the UE, and CSI fed back by a second process configured in advance for the UE, where The CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement.
  • the apparatus receives the UE through the first process and
  • the CSI fed back by the second process is calculated by the UE based on at least the first pilot signal measurement, and the CSI fed back through the first process and the CSI fed back through the second process are calculated based on at least the first pilot signal measurement,
  • the dimensions reflect the channel state information of the first pilot signal, for example, the horizontal dimension and the vertical dimension, and reflect the overall channel state information after 3D-MIMO shaping, so that the base station can directly apply after receiving the CSI fed back by the UE.
  • the UE obtains the first process and the second process feedback CSI by calculating the pilot signal, thereby reducing the processing difficulty of the UE.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the CSI fed back by the first process is N1
  • the number of antenna ports corresponding to the CSI fed back by the second process is N2
  • the product of N1 and N2 is equal to N.
  • the first unit is further configured to: send, by using, a second pilot signal that is configured in advance for the user equipment UE to the
  • the CSI that is fed back by the first process and the CSI that is fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: feedback by using the first process.
  • the CSI is calculated by the UE based on the first pilot signal measurement; the CSI fed back by the second process is that the UE is based on the first pilot signal and the second pilot signal Calculated by common measurements.
  • the first unit is further configured to: send, by using, a second pilot signal that is configured in advance for the user equipment UE to the
  • the CSI that is fed back by the first process and the CSI that is fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: feedback by using the first process.
  • the CSI is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal; and the CSI fed back by the second process is that the UE is based on the first pilot
  • the signal and the second pilot signal are jointly measured and calculated.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process
  • the second The number of antenna ports of the pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the second process.
  • the feedback device of the channel state information CSI includes: a resource determining unit, configured to determine a first pilot resource, a first process, and a second configured by the network side in advance for the user equipment UE where the device is located. a measuring unit, connected to the resource determining unit, configured to calculate a first CSI and a second CSI based on at least a first pilot signal measurement sent by the network side by using the first pilot resource; and a feedback unit connected to The resource determining unit and the measuring unit are configured to feed back the first CSI to the network side by using the first process, and feed back the second CSI to the network side by using the second process.
  • the UE where the device is located is measured and calculated based on at least the first pilot signal.
  • the overall channel state information after the 3D-MIMO shaping is reflected, so that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE, which is compared with the manner in which the UE reports based on the codebook in the prior art.
  • the UE reduces the processing difficulty of the UE by calculating the CSI of the first process and the second process by calculating the pilot signal.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the first CSI is N1
  • the second The number of antenna ports corresponding to the CSI is N2
  • the product of N1 and N2 is equal to N.
  • the resource determining unit is further configured to: determine, by the network side, a second pilot resource that is configured in advance for the UE where the device is located; Specifically, the method is: calculating, according to the first pilot signal, a first CSI, and calculating, according to the first pilot signal, a second pilot signal sent by the network side by using the second pilot resource, Second CSI.
  • the resource determining unit is further configured to: determine, by the network side, a second pilot resource that is configured in advance for the UE where the device is located; Specifically, the first CSI is calculated and calculated based on the first pilot signal and the second pilot signal sent by the network side by using the second pilot resource; based on the first pilot signal and the network side. And calculating, by using the second pilot signal sent by the second pilot resource, the second CSI.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI
  • the second pilot resource is The number of antenna ports is equal to the number of antenna ports corresponding to the second CSI.
  • FIG. 1 is a schematic flowchart of a method for acquiring a CSI on a network side according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of another CSI calculation method on the UE side according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of another method for calculating CSI on the UE side according to an embodiment of the present disclosure
  • 5A-5C are schematic diagrams of a feedback manner of a first process feedback CSI according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a CSI feedback method on a UE side according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural diagram of a CSI acquiring apparatus on a network side according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of another CSI acquiring apparatus on the network side according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a CSI feedback apparatus on a UE side according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of another CSI feedback apparatus on the UE side according to an embodiment of the present disclosure.
  • the embodiment of the present application provides a feedback and acquisition method and a device for channel state information, which are used to reduce the feedback overhead of the UE, reduce the difficulty of CSI feedback processing on the UE side, and make the feedback and acquisition of the channel state information more convenient and save resources.
  • the acquired channel state information can reflect the overall channel state information after 3D-MIMO shaping, and reduce the processing difficulty of the base station.
  • the method of fixing the downtilt angle does not optimize the performance of the system.
  • Vertical beam adjustment is very important for reducing inter-cell interference and improving system performance.
  • the first process and the second process described in the embodiment of the present application may be two processes, or may be two sub-processes of the same process, which are described by two processes in the embodiment of the present application, and the first process and the first process
  • the second process is only a name defined to distinguish the two processes;
  • the first pilot resource and the second pilot resource described in this embodiment may be two independently configured resources, or may be two children of the same resource.
  • a resource which is described in the embodiment of the present application by two independently configured resources, where the first pilot resource and the second pilot resource are only names defined to distinguish two resources;
  • the first pilot resource and the first pilot resource The second pilot resource may be a CSI-RS resource or a CRS resource.
  • pilot signals can be used for channel information measurement or RRM (Radio Resource Management) measurement, including RSRP (Reference Signal Receiving Power) and RSRQ (Reference Signal). Receiving Quality, reference signal reception quality, etc.
  • RRM Radio Resource Management
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal
  • a method for acquiring channel state information CSI includes:
  • Step 102 Send a first pilot signal to the UE by using a first pilot resource configured in advance for the user equipment UE.
  • the first pilot resource specifically refers to a time domain and a frequency domain resource used for transmitting the first pilot signal, and may notify the UE of the resource configuration information of the first pilot resource by using the high layer information, where the high layer information includes the first The transmission period of the pilot signal, the offset, the power, and the index of the first pilot signal.
  • a sub-frame in LTE may have multiple CSI-RS resources to be selected. For example, two antenna systems have 20 CSI-RS resources in one subframe, and an index of the CSI-RS is used to notify the UE that the configuration is Which index corresponds to the CSI-RS resource.
  • Each CSI-RS resource has its own independent subframe period and displacement. If the transmission period of the CSI-RS is 5 subframes, then offset indicates which subframe in each frame the CSI-RS starts to transmit, and may take a value of 0. 1, 2, 3 or 4, for example, when the value is 0, the CSI-RS is transmitted from the subframe 0 in each frame, and when the value is 1, the CSI-RS is transmitted from the subframe 1 in each frame. .
  • Step 104 Receive CSI fed back by the UE by using the first process configured for the UE in advance, and CSI fed back by the second process configured in advance for the UE, where the CSI fed back through the first process and the feedback through the second process are received.
  • the CSI is calculated by the UE based on at least the first pilot signal measurement.
  • the base station receives the CSI that is fed back by the UE through the first process and the second process, and is calculated by the UE based on at least the first pilot signal measurement, and the CSI and the pass through the first process feedback.
  • the CSI fed back by the two processes is calculated based on at least the first pilot signal measurement, and the channel state information of the first pilot signal is reflected from two dimensions, for example, a horizontal dimension and a vertical dimension, reflecting the overall 3D-MIMO shaping.
  • the channel state information is such that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE.
  • the UE calculates and calculates the pilot signal.
  • the first process and the second process feed back CSI, which reduces the processing difficulty of the UE.
  • the base station it is necessary for the base station to configure the first process and the second process for feeding back CSI for the UE, for example, configuring the feedback period, the displacement, and the accuracy of the CSI, so that the base station can facilitate the feedback of the CSI to the UE, which is convenient.
  • the base station better adjusts the parameters of the antenna to improve performance.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the CSI fed back by the first process is N1
  • the second The number of antenna ports corresponding to the CSI fed back by the process is N2
  • the product of N1 and N2 is equal to N.
  • the base station configures a 16-port first pilot resource 202 for the UE, and sends the first pilot resource 202 through the first pilot resource 202.
  • a pilot signal to the UE the first pilot resource includes a transmission period, a displacement, a power, and an index of the first pilot signal of the first pilot signal; and the UE performs measurement calculation based on the first pilot signal.
  • a CSI of a dimension eg, a horizontal dimension
  • a CSI of a second dimension eg, a vertical dimension
  • the CSI is fed back to the base station, and the CSI of the first dimension and the CSI of the second dimension are obtained by the UE measuring the two dimensions of the first pilot signal, so the CSI of the first dimension and the CSI of the second dimension correspond to
  • the number of antenna ports is not the total number of antenna ports of the antenna array, but only the number of antenna ports in one dimension, that is, the CSI of the first dimension (CSI fed back by the first process) corresponds to the number of antenna ports of 4, and the CSI of the second dimension (through the second process Feedforward CSI) corresponding to the number of antenna ports is 4.
  • PMI1 and PMI2 can be calculated by the following formula:
  • the arg function is the set of values that makes PMI1 and PMI2 optimal; the opt function represents the optimization calculation for selecting the best optimization in all optional optimization spaces; H is the measurement of the first pilot resource by the UE.
  • the total channel estimation value, reflecting the channel of the three-dimensional antenna array to the UE, is an Nr x K matrix, Nr is the number of UE receiving antennas, K is the total number of antennas (for example: 16); V1 is precoding in the first dimension
  • the shape matrix codebook 1 ie, codebook1 traverses the value, V2 traverses the value in the second dimension precoding matrix codebook 2 (ie, codebook2), and V1 and V2 respectively correspond to a 4-antenna codebook to find
  • the optimal set of values for PMI1 and PMI2, PMI1 and PMI2 are precoding matrix indication information of the antenna array fed back by the UE.
  • a representative 16-antenna matrix of 3D-MIMO is generated by representing a four-dimensional shaped matrix of two dimensions.
  • the Kronecker product here is only one possible solution.
  • other schemes may also be used to generate an overall shape matrix by a vertical dimension forming matrix and a horizontal dimension shaping matrix, which are not specifically limited herein.
  • the CSI fed back by the first process includes: a precoding matrix indicating PMI information; and a CSI fed back by the second process, including: PMI information and channel quality indicator CQI The information, wherein the CQI information is obtained by the UE based on the PMI information fed back by the first process and the PMI information fed back by the second process.
  • Is the actual channel after the 3D-MIMO observed by the UE is shaped using the V1 and V2 matrices
  • () r, r is the value of the variable of the diagonal of the rth of a matrix
  • I is an identity matrix.
  • Each variable on the diagonal is 1 and the other non-diagonal variables are 0.
  • R is the covariance matrix of the noise/interference measured by the UE. It is a matrix of Nr x Nr. Nr is the number of UE receiving antennas.
  • the CSI fed back by the first process only includes the PMI information, and does not perform the CQI feedback, which reduces the feedback overhead of the UE.
  • the CSI of the first dimension obtained by the UE by performing measurement on the first pilot signal includes: PMI1
  • the CSI of the second dimension includes: PMI2.
  • the UE may calculate assuming that the PMI1 and the PMI2 pair are used.
  • the CQI value after the beamforming is performed by the 3D-MIMO, and the CQI value is fed back through the first process or the second process.
  • the value of the CQI is fed back by the CSI fed back by the second process.
  • the base station configures a pilot resource for the UE, and the base station feeds back two dimensions of CSI based on the pilot resource.
  • the base station may also configure two pilot resources for the UE.
  • the method further includes: sending, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the UE; And the CSI that is fed back through the second process, where the UE is calculated based on at least the first pilot signal measurement, specifically: the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement; The CSI of the process feedback is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement
  • the CSI fed back by the second process is that the UE performs the common measurement calculation based on the first pilot signal and the second pilot signal.
  • the CSI fed back through the first process and the CSI fed back through the second process have a certain correlation, and can reflect channel state information of the antenna array from two dimensions, for example: horizontal dimension and vertical dimension, reflecting 3D MIMO-shaped overall channel state information, so that after receiving the CSI fed back by the UE, the base station can be directly applied to the 3D-MIMO shaping, compared with the prior art in which the UE separately measures and calculates the CSI for a single resource.
  • the CSI fed back by the first process and the CSI fed back by the second process jointly reflect the overall channel state information after 3D-MIMO shaping, and the base station does not need to further process the received CSI, which reduces the processing difficulty of the base station.
  • the base station configures the first pilot resource 302 and the second pilot resource 304, the first process 306, and the second process 308 for the UE, and the CSI fed back through the first process 306 is Based on the first pilot signal measurement calculation in the first pilot resource 302, it is assumed that the PMI information in the CSI fed back through the first process 306 is recorded as PMI1, and the PMI1 can be calculated by the following formula:
  • the CSI fed back through the second process 308 is calculated based on the common measurement of the first pilot signal in the first pilot resource 302 and the second pilot signal in the second pilot resource 304, assuming that the second process 308 is passed.
  • the PMI information in the feedback CSI is recorded as PMI2, and the calculation of PMI2 is based on PMI1 to optimize the performance of 3D-MIMO, which can be calculated by the following formula:
  • H1 and H2 are channel estimation values obtained by the UE respectively measuring the first pilot resource 302 and the second pilot resource 304, and V1 is traversed in the first dimension precoding matrix codebook 1 (ie, codebook1). Value, V2 in the first The two-dimensional precoding shaping matrix codebook 2 (ie, codebook2) traverses the value to find the value that makes PMI2 optimal, and V1 and V2 each correspond to a 4-antenna codebook, that is, the calculation of PMI2 is based on the first The pilot signal and the second pilot signal are measured and calculated, and the calculation of PMI2 depends on the calculation result of PMI1, and PMI1 and PMI2 have certain correlation.
  • the CQI value after the beamforming of the 3D-MIMO by the PMI1 and the PMI2 can be calculated, and the CQI value is fed back through the first process or the second process.
  • the CSI fed back through the second process Feedback the value of this CQI.
  • the method further includes: sending, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the UE;
  • the CSI that is fed back through the second process is calculated by the UE based on at least the first pilot signal measurement, and specifically, the CSI fed back by the first process is that the UE performs the common measurement based on the first pilot signal and the second pilot signal.
  • the CSI fed back through the second process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the CSI fed back by the first process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal, and the CSI fed back through the second process is also the UE based on the first pilot signal and the first
  • the two pilot signals are jointly measured and calculated. Therefore, the CSI fed back through the first process has a certain correlation with the CSI fed back through the second process, and the channel state information of the antenna array can be reflected from two dimensions, for example, the horizontal dimension. And the vertical dimension reflects the overall channel state information after the 3D-MIMO shaping, so that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE, and the UE separates the single resource from the prior art.
  • H1 and H2 are channel estimation values obtained by the UE respectively measuring the first pilot resource 402 and the second pilot resource 404, and V1 is traversed in the first dimension precoding matrix codebook 1 (ie, codebook1). Value, V2 in the first
  • the two-dimensional precoding shaping matrix codebook 2 (ie, codebook2) traverses the value to find the optimal value of PMI1 and PMI2, and V1 and V2 respectively correspond to a 4-antenna codebook, that is, the calculation of PMI1 and PMI2. The calculation is calculated based on the first pilot signal and the second pilot signal.
  • the PMI1 is independently calculated based on the first pilot resource
  • the PMI2 is independently calculated based on the second pilot resource.
  • the PMI1 and PMI2 calculated by the embodiment have certain correlation, which better reflects the overall channel state information after 3D-MIMO shaping.
  • the CQI value after the beamforming of the 3D-MIMO by the PMI1 and the PMI2 is calculated, and the CQI value is fed back through the first process or the second process, as a more preferred embodiment, the feedback is performed by the second process.
  • the CSI feeds back the value of the CQI.
  • the CSI fed back by the first process includes: PMI information.
  • the measurement of the RI, PMI, and CQ of the horizontal dimension is jointly measured by the second pilot resource of the vertical dimension and the first pilot resource of the horizontal dimension, that is, when the UE measures the RI, CQI, and PMI of the horizontal dimension, the calculation thereof A PMI to the vertical dimension is also used.
  • the PMI feedback of the vertical dimension can be periodic or aperiodic.
  • the CSI fed back by the first process further includes: the rank indication RI information corresponding to the PMI information.
  • the CSI that is fed back by the first process further includes the RI information corresponding to the PMI information, and the fed back PMI information is corresponding to the fed back RI.
  • RI 1
  • the PMI information is only calculated in a fixed rank. There is no need to find the optimal PMI in all ranks.
  • the CSI information fed back by the first process does not include CQI information, which reduces the computational difficulty and feedback overhead of the UE.
  • the feedback of the PMI and the RI may be fed back in the same subframe as shown in FIG. 5A, and the feedback period is the same; the feedback may be performed in the manner shown in FIG. 5B, but the PMI and RI feedback
  • the feedback period of the PMI is smaller than the feedback period of the RI.
  • the method shown in FIG. 5C can also be adopted.
  • the PMI and the RI perform feedback in different subframes, and the feedback periods are independently configured.
  • the CSI fed back by the second process includes: PMI information, RI information corresponding to the PMI information, and PMI information and a message based on the second process feedback.
  • the CQI information obtained by the PMI information fed back by a process.
  • the CSI information fed back by the second process should include the PMI information, the RI information corresponding to the PMI information, and
  • the CQI information obtained based on the PMI information fed back by the second process and the PMI information fed back by the first process that is, the CQI information is based on the PMI information fed back by the first process and the PMI information fed back by the second process.
  • the CQI value obtained after the shape is reflected to reflect the overall channel state information after 3D-MIMO shaping.
  • the CSI that is fed back through the second process may include PMI information, or a combination of PMI information and RI information, and the CSI fed back through the first process.
  • the information should include PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the first process and the PMI information fed back by the second process.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process, and the number of antenna ports of the second pilot resource. It is equal to the number of antenna ports corresponding to the CSI fed back through the second process.
  • the number of antenna ports of each pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process and the second process.
  • the first pilot resource corresponds to a horizontal dimension
  • the dimension is 4 antennas
  • the number of antenna ports corresponding to the CSI fed back through the first process is also 4
  • the second pilot resource corresponds to the vertical dimension. If the dimension is 4 antennas, the number of antenna ports corresponding to the CSI fed back through the second process is also 4.
  • the configuration period of the first pilot resource and the configuration period of the second pilot resource may be different.
  • the configuration period of the first pilot resource is L times of the configuration period of the second pilot resource.
  • L is a positive integer greater than or equal to 1
  • the first pilot resource corresponds to a vertical dimension
  • the second pilot resource corresponds to a horizontal dimension.
  • the feedback period of the CSI and the feedback period of the CSI fed back by the second process may be different, and the feedback period of the CSI fed back by the first process is L times of the feedback period of the CSI fed back by the second process, where , L is a positive integer greater than or equal to 1.
  • the first CSI process is used to feed back channel information of a vertical dimension
  • the second CSI process is used to feed back channel information of a horizontal dimension.
  • the speed of movement is much greater than the speed at which the UE moves in the vertical dimension, so the rate of horizontal dimension feedback can be faster than the rate of vertical dimension feedback.
  • the first pilot resource and the second pilot resource are a channel state information reference signal CSI-RS resource or a common reference signal CRS resource.
  • a method for feeding back channel state information CSI provided by the embodiment of the present application, as shown in FIG. 6, includes:
  • Step 602 The user equipment UE determines a first pilot resource, a first process, and a second process that are configured by the network side in advance for the UE.
  • Step 604 The UE calculates the first CSI and the second CSI based on the first pilot signal measurement sent by the network side by using the first pilot resource.
  • Step 606 The UE feeds back the first CSI to the network side by using the first process, and feeds the second CSI to the network side by using the second process.
  • the UE calculates the CSI and the second CSI based on at least the first pilot signal measurement, where the first CSI and the second CSI are calculated based on at least the first pilot signal measurement, from two dimensions. Reflecting the channel state information of the first pilot signal, for example, the horizontal dimension and the vertical dimension, reflecting the overall channel state information after 3D-MIMO shaping, so that the base station can directly apply to the 3D after receiving the CSI fed back by the UE.
  • the MIMO is shaped.
  • the UE calculates the CSI of the first process and the second process by calculating the pilot signal, which reduces the processing difficulty of the UE.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the first CSI is N1
  • the second CSI The number of corresponding antenna ports is N2
  • the product of N1 and N2 is equal to N.
  • the first CSI includes: a precoding matrix indicating PMI information; and the second CSI includes: PMI information and channel quality indication CQI information, where The CQI information is obtained by the UE based on PMI information in the first CSI and PMI information in the second CSI.
  • the method further includes: determining, by the UE, a second pilot resource configured by the network side in advance for the UE; The first pilot signal sent by the pilot resource is calculated to obtain the first CSI and the second CSI, where the UE calculates the first CSI based on the first pilot signal measurement; the UE is based on the A pilot signal and a second pilot signal transmitted by the network side through the second pilot resource are jointly measured and calculated to obtain a second CSI.
  • the method provided by the embodiment of the present application further includes: determining, by the UE, a network The second pilot resource configured in advance for the UE; the UE calculates the first CSI and the second CSI based on the first pilot signal measurement sent by the network side by using the first pilot resource, specifically: Determining, by the UE, the first CSI based on the first pilot signal and the second pilot signal sent by the network side by using the second pilot resource; the UE is based on the first pilot signal and the network side And calculating, by using the second pilot signal sent by the second pilot resource, the second CSI.
  • the first CSI includes: PMI information.
  • the first CSI further includes: a rank indication RI information corresponding to the PMI information.
  • the second CSI includes: PMI information, RI information corresponding to the PMI information, and PMI information in the second CSI and the CQI information obtained from PMI information in the first CSI.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI, and the antenna of the second pilot resource.
  • the number of ports is equal to the number of antenna ports corresponding to the second CSI.
  • the apparatus for acquiring channel state information CSI includes: a first unit 702, configured to send, by using a first pilot resource configured in advance for the user equipment UE a pilot signal is sent to the UE; a second unit 704 is connected to the first unit 702, configured to receive CSI fed back by the UE by using a first process configured in advance for the UE, and configured by configuring the UE in advance The second process is fed back by the CSI, wherein the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement.
  • the device receives the CSI that is fed back by the UE through the first process and the second process, and is calculated by the UE based on at least the first pilot signal measurement, and the CSI and the feedback passed by the first process are obtained.
  • the CSI fed back by the second process is calculated based on at least the first pilot signal measurement, and reflects channel state information of the first pilot signal from two dimensions, for example, a horizontal dimension and a vertical dimension, reflecting the 3D-MIMO shaped shape.
  • the overall channel state information is such that the base station can directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE.
  • the UE calculates and calculates the pilot signal.
  • Obtaining the first process and the second process feedback CSI reduces the processing difficulty of the UE.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the CSI fed back by the first process is N1
  • the number of antenna ports corresponding to the CSI fed back by the second process is N2
  • the product of N1 and N2 is equal to N.
  • the first unit 702 is further configured to: send, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the
  • the CSI that is fed back by the first process and the CSI that is fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: feedback by using the first process.
  • the CSI is calculated by the UE based on the first pilot signal measurement; the CSI fed back by the second process is that the UE is based on the first pilot signal and the second pilot signal Calculated by common measurements.
  • the first unit 702 is further configured to: send, by using a second pilot resource configured in advance for the user equipment UE, a second pilot signal to the
  • the CSI that is fed back by the first process and the CSI that is fed back by the second process are calculated by the UE based on the measurement of the first pilot signal, specifically: feedback by using the first process.
  • the CSI is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal; and the CSI fed back by the second process is that the UE is based on the first pilot
  • the signal and the second pilot signal are jointly measured and calculated.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process
  • the second guide The number of antenna ports of the frequency resource is equal to the number of antenna ports corresponding to the CSI fed back by the second process.
  • the device may be a network device such as a base station, where the first unit 702 may employ a signal transmitter or a transmitter, and the second unit 704 may employ a signal receiver or a receiver.
  • another CSI acquiring apparatus on the network side provided by the embodiment of the present application includes:
  • the processor 800 is configured to read a program in the memory 820 and perform the following process:
  • the transceiver 810 Receiving, by the transceiver 810, the CSI fed back by the UE by the first process configured for the UE in advance, and the CSI fed back by the second process configured for the UE in advance, wherein the CSI fed back through the first process and the feedback through the second process
  • the CSI is calculated by the UE based on at least the first pilot signal measurement.
  • the transceiver 810 is configured to receive and transmit data under the control of the processor 800.
  • the processor 800 is also used to:
  • the transceiver Receiving, by the transceiver, the CSI fed back by the UE through the first process and the CSI fed back by the second process, where the CSI fed back by the first process is calculated by the UE based on the measurement of the first pilot signal; The CSI is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the processor 800 is further configured to:
  • the transceiver Receiving, by the transceiver, the CSI fed back by the UE through the first process and the CSI fed back by the second process, where the CSI fed back by the first process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the CSI fed back through the second process is calculated by the UE based on the common measurement of the first pilot signal and the second pilot signal.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 800 and various circuits of memory represented by memory 820.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 810 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 800 in performing operations.
  • the feedback device of the channel state information CSI includes: a resource determining unit 902, configured to determine that the network side is configured in advance for the user equipment UE where the device is located. a first pilot resource, a first process, and a second process; the measuring unit 904 is connected to the resource determining unit 902, configured to calculate, according to at least the first pilot signal sent by the network side by using the first pilot resource Obtaining a first CSI and a second CSI; a feedback unit 906, connected to the resource determining unit 902 and the measuring unit 904, for feeding back the first CSI to the network side by using the first process, and passing the The second process feeds back the second CSI to the network side.
  • the UE where the device is located calculates the CSI and the second CSI based on at least the first pilot signal measurement, and the first CSI and the second CSI are calculated based on at least the first pilot signal measurement.
  • the number of antenna ports of the first pilot resource is N
  • the number of antenna ports corresponding to the first CSI is N1
  • the second CSI The number of corresponding antenna ports is N2
  • the product of N1 and N2 is equal to N.
  • the resource determining unit 902 is further configured to: determine, by the network side, a second pilot resource that is configured in advance for the UE where the device is located; 904.
  • the method is specifically configured to: calculate, according to the first pilot signal, a first CSI, based on the first pilot signal and a network side pass.
  • the second pilot signal transmitted by the second pilot resource is jointly measured and calculated to obtain a second CSI.
  • the resource determining unit 902 is further configured to: determine, by the network side, a second pilot resource that is configured in advance for the UE where the device is located; 904. Specifically, the first CSI is calculated and calculated based on the first pilot signal and the second pilot signal sent by the network side by using the second pilot resource; and the first pilot signal and the network are used. The second pilot signal sent by the second pilot resource is jointly measured and calculated to obtain a second CSI.
  • the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI
  • the antenna of the second pilot resource The number of ports is equal to the number of antenna ports corresponding to the second CSI.
  • the device may be part of the UE, or may be a UE or other terminal device, where the resource determining unit 902 may employ a signal receiver or a receiver, and the measuring unit 904 may use a single chip microcomputer or a CPU processor.
  • Feedback unit 906 can employ a signal transmitter or transmitter.
  • another CSI feedback device on the UE side provided by the embodiment of the present application includes:
  • the first CSI is fed back to the network side by the transceiver 110, and the second CSI is fed back to the network side.
  • the transceiver 110 is configured to receive and transmit data under the control of the processor 100.
  • the processor 100 is also used to:
  • the first CSI is fed back to the network side by the transceiver 110, and the second CSI is fed back to the network side.
  • the processor 100 is also used to:
  • the frequency signal is jointly measured and calculated to obtain a second CSI
  • the first CSI is fed back to the network side by the transceiver 110, and the second CSI is fed back to the network side.
  • the bus architecture may include any number of interconnected buses and bridges, specifically by the processor 100.
  • the various circuits represented by one or more processors and memory represented by memory 120 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 130 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 100 is responsible for managing the bus architecture and general processing, and the memory 120 can store data used by the processor 100 in performing operations.
  • the base station receives the CSI that is fed back by the UE through the first process and the second process, and is calculated by the UE based on at least the first pilot signal measurement, and the CSI and the feedback passed by the first process are obtained.
  • the CSI fed back by the second process is calculated based on at least the first pilot signal measurement, and reflects channel state information of the first pilot signal from two dimensions, for example, a horizontal dimension and a vertical dimension, reflecting the 3D-MIMO shaped shape.
  • the overall channel state information enables the base station to directly apply to the 3D-MIMO shaping after receiving the CSI fed back by the UE, without further processing by the base station on the received CSI, which reduces the processing difficulty of the base station and reduces the processing of the UE. Difficulty.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif de rétroaction et d'acquisition d'informations d'état de canal (CSI) permettant de réduire le temps système de la rétroaction d'un équipement utilisateur (UE) et de réduire la difficulté de traitement de rétroaction de CSI du côté UE, ce qui permet une rétroaction et une acquisition des CSI plus pratiques et plus rapides, et d'économiser des ressources; de plus, les CSI obtenues peuvent représenter les CSI globales après mise en forme 3D-MIMO. Le procédé d'acquisition de CSI comprend les étapes suivantes : transmettre un premier signal pilote à l'UE par l'intermédiaire d'une première ressource pilote préattribuée à l'UE; et recevoir les CSI renvoyées en rétroaction par l'UE par l'intermédiaire d'un premier processus préattribué à l'UE et les CSI renvoyées en rétroaction par l'UE par l'intermédiaire d'un deuxième processus préattribué à l'UE, les CSI renvoyées en rétroaction par l'intermédiaire du premier processus et les CSI renvoyées en rétroaction par l'intermédiaire du deuxième processus étant mesurées et calculées par l'UE au moins en fonction du premier signal pilote.
PCT/CN2015/092465 2014-10-31 2015-10-21 Procédé et dispositif de rétroaction et d'acquisition d'informations d'état de canal WO2016066036A1 (fr)

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WO2014072796A1 (fr) * 2012-11-09 2014-05-15 Broadcom Corporation Procédés et appareil pour transmission sans fil
US20140177683A1 (en) * 2012-12-20 2014-06-26 Motorola Mobility Llc Method and apparatus for antenna array channel feedback
CN103974315A (zh) * 2013-02-05 2014-08-06 电信科学技术研究院 三维信道测量资源配置和质量测量方法及设备

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WO2014072796A1 (fr) * 2012-11-09 2014-05-15 Broadcom Corporation Procédés et appareil pour transmission sans fil
US20140177683A1 (en) * 2012-12-20 2014-06-26 Motorola Mobility Llc Method and apparatus for antenna array channel feedback
CN103974315A (zh) * 2013-02-05 2014-08-06 电信科学技术研究院 三维信道测量资源配置和质量测量方法及设备

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