CN105450332A - Three-dimensional channel state information determination method and device - Google Patents

Abstract

An embodiment of the invention discloses a three-dimensional channel state information determination method and device. The method provided by the embodiment of the invention includes the following steps: network equipment receives a first channel state indicator (CSI) which is determined by a terminal through measurement of a first pilot signal; the network equipment receives a second CSI which is determined by the terminal through measurement of a second pilot signal according to a first adjustment amount; the first adjustment amount is determined according to a measuring result of the first pilot signal; and the network equipment determines a three-dimensional CSI according to the first CSI and the second CSI. The second CSI obtained through the method provided by the embodiment of the invention reflects the first adjustment amount, thereby being matched with an actual transmission capability of a channel, and improving system performance.

Description

Three-dimensional channel state information determining method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining three-dimensional channel state information.

Background

In existing cellular systems, the base station antenna arrays are typically arranged horizontally. The beam at the transmitting end of the base station can be adjusted only in the horizontal direction, and the vertical direction is a fixed downward inclination angle for each user, so that various beamforming/precoding techniques and the like are performed based on the channel information in the horizontal direction. In fact, since the wireless signal is propagated in three dimensions in space, the method of fixing the downtilt angle does not optimize the performance of the system. The beam adjustment in the vertical direction is of great significance to the improvement of the system performance. With the development of antenna technology, active antennas capable of independent control of each array have emerged in the industry. With such an antenna array, a dynamic adjustment of the beam in the vertical direction is made possible.

In a Frequency Division Duplex (FDD) system, channel state information reported by user equipment is required to realize three-dimensional beamforming/precoding, and one possible implementation manner is a codebook-based reporting manner that is adopted all the time in the lte rel-8 system. Although the precoding matrix may be obtained by a Precoding Matrix (PMI) in horizontal and vertical Channel State Information (CSI), while rank indication information (RI) and Channel Quality Information (CQI) are difficult to be calculated by the base station from the horizontal and vertical channel state information, which results in that the RI and CQI obtained by the base station do not match with the actual transmission capability of the channel, thereby degrading the performance of data transmission.

In summary, in the prior art, the terminal feeds back the horizontal and vertical channel state information respectively, and it is difficult for the base station to obtain the link adaptive parameters of the downlink transmission, such as RI and CQI, according to the feedback of the terminal, which results in the performance degradation of the system.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining three-dimensional information state information, which are used for solving the technical problem that in the prior art, a terminal respectively feeds back horizontal and vertical channel state information, and a base station is difficult to obtain downlink transmission link adaptive parameters according to the feedback of the terminal, so that the system performance is reduced.

The method for determining the three-dimensional channel state information provided by the embodiment of the invention comprises the following steps:

the method comprises the steps that network equipment receives first Channel State Information (CSI), wherein the first CSI is determined by a terminal through measurement of a first pilot signal;

the network equipment receives second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal according to the first adjustment quantity; the first adjustment amount is determined from a measurement result of the first pilot signal;

and the network equipment determines three-dimensional CSI according to the first CSI and the second CSI.

Preferably, the first adjustment amount is determined by the terminal according to the measurement result of the first pilot signal.

Preferably, the network device determines a first adjustment amount according to the first CSI, and feeds back the first adjustment amount to the terminal;

or, the network device determines the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feeds back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

Preferably, the network device receives the second CSI, including:

the network equipment receives the second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal, and the second pilot signal is sent after the network equipment adjusts the transmission power of the second pilot signal according to the first adjustment amount; or,

the network equipment receives the second CSI, and the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

Preferably, the first adjustment amount is determined by the terminal according to any one of the following schemes one to six;

the first scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;

the second scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|V{H}_1{W}_1\left|\right|}_F^2}{A{\left|\right|{\mathrm{VH}}_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the third scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{{\left|\right|H_1(:,k)\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁Is a first precoding matrix; h₁(k) is H₁The k-th column of (1);

the fourth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G＝CQI1–CQI2

wherein G is the first adjustment amount, CQI1 refers to CQI in the first CSI, and CQI2 refers to CQI of a single port;

the fifth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment quantity, RSRP1 refers to single-port RSRP, and RSRP2 refers to beamforming RSRP;

the sixth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

SINR 1-SINR 2 or G10 log₁₀(SINR1/SINR2)

Where G is the first adjustment amount, SINR1 is a signal to interference and noise ratio calculated under the assumption that a signal is transmitted from an antenna port corresponding to the first pilot signal, and SINR2 refers to a signal to interference and noise ratio of single-port transmission.

Preferably, the network device determines the first adjustment amount by using the following scheme one or scheme two;

the first scheme comprises the following steps:

the network equipment receives CQI in the first CSI fed back by the terminal and CQI of a single port;

the network equipment obtains a first signal interference noise ratio according to CQI mapping in the first CSI and obtains a second signal interference noise ratio according to the CQI mapping of the single port;

the network device determines the first adjustment amount according to the following formula:

G＝CQI1’–CQI2’

wherein G is the first adjustment amount, CQI1 'is a first signal to interference plus noise ratio, and CQI 2' is a second signal to interference plus noise ratio;

the second scheme comprises the following steps:

the network device determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to beamformed RSRP.

Preferably, the method further comprises:

the network equipment sends the first pilot signal through the antenna units of a column of antennas and sends the second pilot signal through the antenna units of a row of antennas; or

And the network equipment transmits the first pilot signal through the antenna units of a row of antennas and transmits the second pilot signal through the antenna units of a column of antennas.

Preferably, the determining, by the network device, the three-dimensional CSI according to the first CSI and the second CSI includes:

the network equipment determines a precoding matrix in the three-dimensional CSI according to the following formula:

$W=W_1\⊗W_2$ or $W=W_2\⊗W_1;$

Wherein W is a precoding matrix in the three-dimensional CSI, W₁Is a first precoding matrix, W₂For the second pre-coding matrix to be used,and the second precoding matrix is a precoding matrix corresponding to a second PMI in the second CSI.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

The embodiment of the invention provides a three-dimensional channel state information feedback method, which comprises the following steps:

the terminal determines first Channel State Information (CSI) by measuring a first pilot signal and feeds the first CSI back to the network equipment;

the terminal determines second CSI by measuring a second pilot signal according to the first adjustment amount and feeds the second CSI back to the network equipment; the first adjustment amount is determined based on measurements of the first pilot signal.

Preferably, the terminal determines the first adjustment amount according to the first CSI.

Preferably, the first adjustment amount is determined by the network device according to the first CSI and fed back to the terminal;

or, the terminal determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the terminal.

Preferably, the determining, by the terminal, the second CSI by measuring the second pilot signal according to the first adjustment amount includes:

the terminal determines the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or,

and the terminal determines the second CSI according to the first adjustment quantity and the measurement result of the second pilot signal.

Preferably, the determining, by the terminal, the second CSI according to the first adjustment amount and the measurement result of the second pilot signal includes:

the terminal determines second CSI by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a second channel matrix by measuring the second pilot signal, and applies the forming gain to the second channel matrix according to the following formula:

wherein,for applying the shaped gain channel matrix, H₂Is a second channel matrix; the terminal determines the second CSI according to the channel matrix after the forming gain is applied;

the second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power to the CSI-RS power by using the forming gain, and determines the second CSI according to the adjusted ratio of the data channel power to the CSI-RS power;

the third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the forming gain, and determines the second CSI by using the adjusted interference estimation value.

Preferably, the terminal determines the first adjustment amount by using any one of the following schemes one to six;

the first scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;

the second scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|V{H}_1{W}_1\left|\right|}_F^2}{A{\left|\right|{\mathrm{VH}}_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the third scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{{\left|\right|H_1(:,k)\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is firstChannel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁Is a first precoding matrix; h₁(k) is H₁The k-th column of (1);

the fourth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G＝CQI1–CQI2

wherein G is the first adjustment amount, CQI1 refers to CQI in the first CSI, and CQI2 refers to CQI of a single port;

the fifth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment quantity, RSRP1 refers to single-port RSRP, and RSRP2 refers to beamforming RSRP;

the sixth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

SINR 1-SINR 2 or G10 log₁₀(SINR1/SINR2)

Where G is the first adjustment amount, SINR1 is a signal to interference and noise ratio calculated under the assumption that a signal is transmitted from an antenna port corresponding to the first pilot signal, and SINR2 refers to a signal to interference and noise ratio of single-port transmission.

Preferably, the first adjustment amount is determined by the network device according to the following scheme one or scheme two;

the first scheme comprises the following steps:

the network equipment receives CQI in the first CSI fed back by the terminal and CQI of a single port;

the network equipment obtains a first signal interference noise ratio according to CQI mapping in the first CSI and obtains a second signal interference noise ratio according to the CQI mapping of the single port;

the network device determines the first adjustment amount according to the following formula:

G＝CQI1’–CQI2’

wherein G is the first adjustment amount, CQI1 'is a first signal to interference plus noise ratio, and CQI 2' is a second signal to interference plus noise ratio;

the second scheme comprises the following steps:

the network device determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to beamformed RSRP.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

The network device provided by the embodiment of the invention comprises:

the terminal comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving first Channel State Information (CSI), and the first CSI is determined by the terminal through measuring a first pilot signal; receiving second CSI which is determined by the terminal through measurement of a second pilot signal according to the first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal;

and the three-dimensional CSI module is used for determining the three-dimensional CSI according to the first CSI and the second CSI.

Preferably, the first adjustment amount is determined by the terminal according to the measurement result of the first pilot signal.

Preferably, the method further comprises the following steps:

the adjustment quantity determining module is used for determining a first adjustment quantity according to the first CSI and feeding back the first adjustment quantity to the terminal; or, the apparatus is configured to determine the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feed back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

Preferably, the receiving module is further configured to:

receiving the second CSI, which is determined by the terminal through measurement of the second pilot signal, wherein the second pilot signal is sent by the network equipment after the transmission power of the second pilot signal is adjusted according to the first adjustment amount; or,

and receiving the second CSI, wherein the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

Preferably, the method further comprises the following steps:

a sending module, configured to send the first pilot signal through antenna units of a column of antennas, and send the second pilot signal through antenna units of a row of antennas; or, the antenna unit is configured to transmit the first pilot signal through the antenna unit of a row of antennas, and transmit the second pilot signal through the antenna unit of a column of antennas.

Preferably, the module for determining three-dimensional CSI is further configured to:

determining a precoding matrix in the three-dimensional CSI according to the following formula:

$W=W_1\⊗W_2$ or $W=W_2\⊗W_1;$

Wherein W is a precoding matrix in the three-dimensional CSI, W₁Is a first precoding matrix, W₂For the second pre-coding matrix to be used,and the second precoding matrix is a precoding matrix corresponding to a second PMI in the second CSI.

The embodiment of the invention provides a terminal, which comprises:

the processing module is used for determining first Channel State Information (CSI) by measuring the first pilot signal; according to the first adjustment quantity, a second CSI is determined by measuring a second pilot signal; wherein the first adjustment amount is determined from measurements of the first pilot signal;

and the sending module is used for feeding back the first CSI and the second CSI to the network equipment.

Preferably, the processing module is further configured to:

determining the first adjustment amount according to the first CSI.

Preferably, the first adjustment amount is determined by the network device according to the first CSI and fed back to the processing module;

or, the processing module determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device through the sending module, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the processing module.

Preferably, the processing module is further configured to:

determining the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or, determining the second CSI according to the first adjustment amount and a measurement result of a second pilot signal.

Preferably, the processing module is further configured to:

determining second CSI by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a second channel matrix by measuring the second pilot signal, and applies the forming gain to the second channel matrix according to the following formula:

wherein,for applying the shaped gain channel matrix, H₂Is a second channel matrix; the terminal determines the second CSI according to the channel matrix after the forming gain is applied;

the second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power to the CSI-RS power by using the forming gain, and determines the second CSI according to the adjusted ratio of the data channel power to the CSI-RS power;

the third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the forming gain, and determines the second CSI by using the adjusted interference estimation value.

The method comprises the steps that a network device receives first Channel State Information (CSI), wherein the first CSI is determined by a terminal through measuring a first pilot signal; the network equipment receives second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal according to the first adjustment quantity; the first adjustment amount is determined from a measurement result of the first pilot signal; and the network equipment determines three-dimensional CSI according to the first CSI and the second CSI. The second CSI obtained by the method of the embodiment of the invention reflects the first adjustment amount, thereby matching with the actual transmission capability of the channel and improving the system performance.

Drawings

Fig. 1 is a schematic diagram of a system architecture for determining three-dimensional channel state information according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a method for determining three-dimensional channel state information according to an embodiment of the present invention;

fig. 3 is a schematic flow chart of a three-dimensional channel state information feedback method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a network device according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a terminal according to an embodiment of the present invention;

Detailed Description

The method comprises the steps that first Channel State Information (CSI) and second CSI fed back by a terminal are received through network equipment; wherein the second CSI is determined according to a first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal; and the network equipment determines three-dimensional CSI according to the first CSI and the second CSI. The second CSI obtained by the method of the embodiment of the invention reflects the first adjustment amount, thereby matching with the actual transmission capability of the channel and improving the system performance.

As shown in fig. 1, a system architecture diagram applicable to the embodiment of the present invention is shown. The system architecture comprises a network device 101 and at least one terminal 102; the network device may be a base station or a transmitter in a base station, and the terminal may be a mobile station, a base station, or a transmitter in a base station.

The network device 101 may send a pilot signal to the terminal 102 and determine three-dimensional channel state information according to information fed back by the terminal 102.

The pilot signal may be used for Channel State Information (CSI) measurement or Reference Signal Received Power (RSRP) measurement, and after receiving the pilot signal sent by the network device, the terminal feeds back CSI or RSRP information to the network device through measurement. In the embodiment of the present invention, the pilot signal is a channel state information reference signal CSI-RS, and may also be another pilot signal, such as a Cell-specific reference signal (CRS).

In the embodiment of the present invention, the first adjustment amount may be a beamforming gain of a vertical dimension or a beamforming gain of a horizontal dimension determined by a terminal or a network device; the method may also include adjusting, by the network device, the beamforming gain obtained according to a second adjustment amount determined and fed back by the terminal, where the second adjustment amount may be a beamforming gain in a vertical dimension or a beamforming gain in a horizontal dimension determined and fed back by the terminal. In the embodiment of the present invention, the first adjustment amount may also be obtained by the terminal or the network device according to the determined beamforming gain of the vertical dimension or the beamforming gain of the horizontal dimension, for example, an offset is added to the beamforming gain, where G is B + Delta, where G is the first adjustment amount, B is the beamforming gain, Delta is an offset, and the unit is dB, and Delta may be related to the transmission power of the first pilot signal and the transmission power of the second pilot signal; the first adjustment quantity can also be obtained by the network device according to the adjustment of a second adjustment quantity determined and fed back by the terminal, and the second adjustment quantity can be the beamforming gain of the vertical dimension or the beamforming gain of the horizontal dimension determined and fed back by the terminal.

Fig. 2 is a schematic flow chart of a method for determining three-dimensional channel state information according to an embodiment of the present invention, where the method includes:

step 201, a network device receives a first channel state information CSI, which is determined by a terminal through measurement of a first pilot signal;

step 202, the network device receives a second CSI, which is determined by the terminal by measuring a second pilot signal according to a first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal;

step 203, the network device determines a three-dimensional CSI according to the first CSI and the second CSI.

Preferably, the first adjustment amount is determined by the terminal according to the measurement result of the first pilot signal.

Preferably, in the embodiment of the present invention, the measurement result of the first pilot signal includes the first CSI; the network equipment determines a first adjustment amount according to the first CSI and feeds the first adjustment amount back to the terminal; or, the network device determines the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feeds back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

Preferably, the network device receives the second CSI, including:

the network equipment receives the second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal, and the second pilot signal is sent after the network equipment adjusts the transmission power of the second pilot signal according to the first adjustment amount; or,

the network equipment receives the second CSI, and the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

Specifically, the first adjustment amount is determined by the terminal by using any one of the following schemes one to six;

the first scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_1\left|\right|}_F^2}\right)$ equation 1

Wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;

the second scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|V{H}_1{W}_1\left|\right|}_F^2}{A{\left|\right|{\mathrm{VH}}_1\left|\right|}_F^2}\right)$ equation 2

Wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the third scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{{\left|\right|H_1(:,k)\left|\right|}_F^2}\right)$ equation 3

Wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁Is a first precoding matrix; h₁(k) is H₁The k-th column of (1);

the fourth scheme comprises the following steps:

the terminal calculates the vertical CQI based on the vertical PMI, that is, the terminal assumes that the network device uses a precoding matrix corresponding to the vertical PMI to perform data transmission, and in this case, calculates the vertical CQI. A terminal calculates the CQI of a single port, and the CQI of the single port is calculated based on one port of a vertical dimension CSI-RS;

the terminal determines the first adjustment amount according to the following formula:

G-CQI 1-CQI 2 formula 4

Wherein G is the first adjustment amount, CQI1 refers to CQI in the first CSI, and CQI2 refers to the single-port CQI;

the fifth scheme comprises the following steps:

the terminal calculates the RSRP of a single port, wherein the RSRP of the single port is obtained by calculating based on one port of the CSI-RS with the vertical dimension, or is obtained by calculating based on a plurality of CSI-RS ports and then calculating an average value. A terminal calculates a beam forming RSRP, wherein the beam forming RSRP is the RSRP calculated after a precoding matrix is applied to a channel estimation value to obtain an equivalent channel;

in particular, assume a vertical channel matrix ofWherein N is_rNumber of receiving antenna units of terminal, N₁Is the number of antenna ports of the CSI-RS in the vertical dimension. The precoding matrix corresponding to the vertical PMI calculated and fed back by the terminal is assumed to be W₁Then, the beamforming RSRP is calculated as follows:

$\mathrm{RSRP}2=\mathrm{\α}\·\mathrm{mean}\left({\left|\right|H_1{W}_1\left|\right|}_F^2\right)$ or $\mathrm{RSRP}2={10\log }_{10}\left(\mathrm{\α}\·\mathrm{mean}\left({\left|\right|H_1{W}_1\left|\right|}_F^2\right)\right)$

Mean (mean) is an averaging operation, namely, a value measured and calculated in a certain bandwidth and a certain time is averaged, and a is a scaling factor used for compensating and adjusting AGC gain;

the terminal determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1) equation 5

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to the beamformed RSRP;

the sixth scheme comprises the following steps:

the terminal calculates and obtains a vertical SINR based on the vertical PMI, namely the terminal assumes that data are sent from each port of the vertical dimension CSI-RS and the network equipment adopts a precoding matrix corresponding to the vertical PMI to carry out data transmission, and under the condition, the vertical SINR is calculated; the terminal calculates the SINR of a single port by assuming that data is sent out from one port of the CSI-RS in the vertical dimension;

the terminal determines the first adjustment amount according to the following formula:

SINR 1-SINR 2 or G10 log₁₀(SINR1/SINR2) equation 6

Where G is the first adjustment amount, SINR1 is a signal to interference plus noise ratio calculated under the assumption that a signal is transmitted from an antenna port corresponding to the first pilot signal, and SINR2 is a signal to interference plus noise ratio of single-port transmission.

The seventh scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|{\mathrm{VH}}_1{W}_1\left|\right|}_F^2}{A{\left|\right|V{H}_2\left|\right|}_F^2}\right)$ equation 7

Wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first one of the pre-coding matrices,is a second channel matrix, N₂Is the number of antenna ports for the second pilot signal, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the eighth scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_2\left|\right|}_F^2}\right)$ equation 8

Wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first one of the pre-coding matrices,is a second channel matrix, N₂Is the number of antenna ports for the second pilot signal, a is a constant, is a pre-defined value or is configured by the network.

Optionally, the network device determines the first adjustment amount by using any one of the first to eighth schemes, where the specific calculation formula refers to the above formulas 1 to 8, and details are not repeated here.

Optionally, the network device determines the first adjustment amount by using the following scheme one or scheme two;

the first scheme comprises the following steps:

the network equipment receives CQI in the first CSI fed back by the terminal and CQI of a single port;

the network equipment obtains a first signal interference noise ratio according to CQI mapping in the first CSI and obtains a second signal interference noise ratio according to the CQI mapping of the single port;

the network device determines the first adjustment amount according to the following formula:

G-CQI 1 '-CQI 2' formula 9

Wherein G is the first adjustment amount, CQI1 'is a first signal to interference plus noise ratio, and CQI 2' is a second signal to interference plus noise ratio;

the second scheme comprises the following steps:

the network device determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1) equation 10

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to beamformed RSRP.

Preferably, the method further comprises:

the network equipment sends the first pilot signal through the antenna units of a column of antennas and sends the second pilot signal through the antenna units of a row of antennas; or

And the network equipment transmits the first pilot signal through the antenna units of a row of antennas and transmits the second pilot signal through the antenna units of a column of antennas.

Preferably, in step 203, the determining, by the network device, the three-dimensional CSI according to the first CSI and the second CSI includes:

the network equipment determines a precoding matrix in the three-dimensional CSI according to the following formula:

$W=W_1\⊗W_2$ or $W=W_2\⊗W_1;$ Equation 11

Wherein W is a precoding matrix in the three-dimensional CSI, W₁Is a first precoding matrix, W₂For the second pre-coding matrix to be used,and the second precoding matrix is a precoding matrix corresponding to a second PMI in the second CSI.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

Fig. 3 is a schematic flow chart of a method for feeding back three-dimensional channel state information according to an embodiment of the present invention, where the method includes:

step 301, the terminal determines a first channel state information CSI by measuring a first pilot signal, and feeds the first CSI back to the network device;

step 302, the terminal determines a second CSI by measuring a second pilot signal according to the first adjustment amount, and feeds the second CSI back to the network device; the first adjustment amount is determined based on measurements of the first pilot signal.

Preferably, the terminal determines the first adjustment amount according to the first CSI.

Preferably, the first adjustment amount is determined by the network device according to the first CSI and fed back to the terminal; or, the terminal determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the terminal.

Preferably, the determining, by the terminal, the second CSI by measuring the second pilot signal according to the first adjustment amount includes:

the terminal determines the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or,

and the terminal determines the second CSI according to the first adjustment quantity and the measurement result of the second pilot signal.

Specifically, the terminal determines the first adjustment amount by using any one of the first to eighth schemes, and the specific calculation formula refers to the above formulas 1 to 8, which is not described herein again.

Preferably, the first adjustment amount is determined by the network device using the scheme one or the scheme two, and the specific calculation formula refers to the above formula 9 or formula 10, which is not described herein again.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the overall process of the method of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The first embodiment of the invention:

the network equipment configures a pilot resource of a vertical dimension and a pilot resource of a horizontal dimension for the terminal. Each pilot resource may have a separate subframe period and offset, or both pilot resources may be configured with the same subframe period and offset.

Optionally, the pilot signal in the vertical dimension is transmitted from one column of antennas, that is, the pilot signal in the vertical dimension is transmitted from each antenna unit of one column of antennas; the pilot signal in the horizontal dimension is transmitted from one row of antennas, that is, the pilot signal in the horizontal dimension is transmitted from each antenna unit of one row of antennas.

And the terminal measures the pilot signal of the vertical dimension to obtain the corresponding CSI of the vertical dimension and feeds the obtained CSI of the vertical dimension back to the network equipment. The CSI in the vertical dimension includes a PMI, and the PMI is a PMI when RI is fixed to be 1, that is, a precoding matrix corresponding to the PMI is a column vector or a row vector, and is used to notify a network device of a weighted value for performing single-stream beamforming in the vertical dimension.

Optionally, the terminal feeds back or does not feed back the CQI based on the vertical dimension PMI.

Specifically, the terminal determines the beamforming gain of the vertical dimension by using any one of the first to third schemes, and the specific calculation formula refers to the above formulas 1 to 3, which is not described herein again.

Specifically, the terminal determines the CSI of the horizontal dimension by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a channel matrix of the horizontal dimension by measuring a pilot signal of the horizontal dimension, applies beam forming gain to the channel matrix of the horizontal dimension, and calculates CSI of the horizontal dimension, wherein the CSI of the horizontal dimension comprises RI, PMI and CQI.

Specifically, assume that the terminal obtains a second-dimensional channel matrix by measuring the second-dimensional pilot signal, and applies the beamforming gain to the second-dimensional channel matrix according to the following formula:

wherein,for applying the channel matrix after beamforming gain, H₂A channel matrix in a second dimension;

the terminal determines the CSI of the second dimension according to the channel matrix after the beamforming gain is applied; the CSI of the horizontal dimension calculated by the terminal reflects the forming gain brought by the vertical dimension precoding, so the RI and the CQI calculated by the method are more accurate.

The second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power and the CSI-RS power by using the vertical dimension wave beam forming gain, for example, the ratio of the network configuration data channel power and the CSI-RS power is Pc [ dB ], and the ratio after the vertical dimension wave beam forming gain adjustment is G + Pc [ dB ]; and the terminal calculates the CSI of the horizontal dimension by using the adjusted ratio.

The third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the beam forming gain G of the vertical dimension, and calculates the CSI of the horizontal dimension by using the adjusted interference estimation value. E.g. the interference correlation matrix estimated by the terminal, i.e. the covariance matrix, isThe adjusted interference correlation matrix is R/10^G/10(ii) a Or the interference signal power estimated by the terminal is sigma²Then the adjusted interference signal power is σ²/10^G/10(ii) a And the terminal calculates the CSI of the horizontal dimension by adopting the adjusted interference correlation matrix or the interference signal power.

And the terminal feeds back the calculated horizontal dimension CSI to the network equipment, wherein the CSI comprises RI, PMI and CQI.

And after receiving the CSI of the vertical dimension and the horizontal dimension fed back by the terminal, the network equipment calculates the link self-adaptive parameters.

Optionally, the network device determines a precoding matrix for data transmission for the entire antenna array using equation 11 above.

The second embodiment of the invention:

the network equipment configures a pilot resource of a vertical dimension and a pilot resource of a horizontal dimension for the terminal. Each pilot resource may have a separate subframe period and offset, or both pilot resources may be configured with the same subframe period and offset.

Optionally, the pilot signal in the vertical dimension is transmitted from one column of antennas, that is, the pilot signal in the vertical dimension is transmitted from each antenna unit of one column of antennas; the pilot signal in the horizontal dimension is transmitted from one row of antennas, that is, the pilot signal in the horizontal dimension is transmitted from each antenna unit of one row of antennas.

And the terminal measures the pilot signal of the vertical dimension to obtain the corresponding CSI of the vertical dimension and feeds the obtained CSI of the vertical dimension back to the network equipment. The CSI in the vertical dimension includes a PMI, and the PMI is a PMI when RI is fixed to be 1, that is, a precoding matrix corresponding to the PMI is a column vector or a row vector, and is used to notify a network device of a weighted value for performing single-stream beamforming in the vertical dimension.

Optionally, the terminal calculates and feeds back the CQI of the vertical dimension to the network device. The terminal calculates the CQI of the vertical dimension based on the PMI of the vertical dimension, that is, the terminal assumes that the network device uses a precoding matrix corresponding to the PMI of the vertical dimension to perform data transmission, and calculates the CQI of the vertical dimension under the circumstance. And the terminal calculates and feeds back the CQI of the single port to the network equipment, and the CQI of the single port is calculated based on one port of the CSI-RS with the vertical dimension.

Optionally, the terminal calculates and feeds back RSRP of a single port, where the RSRP of the single port is obtained by calculating based on one port of the vertical-dimension CSI-RS, or is obtained by calculating based on a plurality of CSI-RS ports and then calculating an average value. And the terminal calculates and feeds back a beam forming RSRP, wherein the beam forming RSRP refers to the RSRP calculated after a precoding matrix is applied to a channel estimation value to obtain an equivalent channel.

Specifically, the beamforming RSRP is calculated as follows:

$\mathrm{RSRP}2=\mathrm{\α}\·\mathrm{mean}\left({\left|\right|H_1{W}_1\left|\right|}_F^2\right)$ or $\mathrm{RSRP}2={10\log }_{10}\left(\mathrm{\α}\·\mathrm{mean}\left({\left|\right|H_1{W}_1\left|\right|}_F^2\right)\right)$

Wherein RSRP2 is a beamformed RSRP,channel matrix of vertical dimension, N_rNumber of receiving antenna units of terminal, N₁Number of antenna ports, W, of CSI-RS in vertical dimension₁And calculating and feeding back a precoding matrix corresponding to the PMI of the vertical dimension for the terminal.

Mean () is an averaging operation, that is, a value measured and calculated in a certain bandwidth and a certain time is averaged, and a is a scaling factor used for compensation adjustment of AGC gain.

Optionally, the network device determines the beamforming gain of the vertical dimension by using the first scheme or the second scheme, and the specific calculation formula refers to the above formula 9 or formula 10, which is not described herein again.

And the network equipment informs the obtained beam forming gain of the vertical dimension to the terminal through a downlink signaling, wherein the downlink signaling is a physical layer signaling or a high layer signaling.

Optionally, after receiving the beamforming gain, the terminal determines the CSI of the horizontal dimension by using the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a channel matrix of the horizontal dimension by measuring a pilot signal of the horizontal dimension, applies beam forming gain to the channel matrix of the horizontal dimension, and calculates CSI of the horizontal dimension, wherein the CSI of the horizontal dimension comprises RI, PMI and CQI.

Specifically, assume that the terminal obtains a second-dimensional channel matrix by measuring the second-dimensional pilot signal, and applies the beamforming gain to the second-dimensional channel matrix according to the following formula:

wherein,for applying the channel matrix after beamforming gain, H₂A channel matrix in a second dimension;

the terminal determines the CSI of the second dimension according to the channel matrix after the beamforming gain is applied; the CSI of the horizontal dimension calculated by the terminal reflects the forming gain brought by the vertical dimension precoding, so the RI and the CQI calculated by the method are more accurate.

The second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power and the CSI-RS power by using the vertical dimension wave beam forming gain, for example, the ratio of the network configuration data channel power and the CSI-RS power is Pc [ dB ], and the ratio after the vertical dimension wave beam forming gain adjustment is G + Pc [ dB ]; and the terminal calculates the CSI of the horizontal dimension by using the adjusted ratio.

The third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the beam forming gain G of the vertical dimension, and calculates the CSI of the horizontal dimension by using the adjusted interference estimation value. E.g. the interference correlation matrix estimated by the terminal, i.e. the covariance matrix, isThe adjusted interference correlation matrix is R/10^G/10(ii) a Or the interference signal power estimated by the terminal is sigma²Then the adjusted interference signal power is σ²/10^G/10(ii) a And the terminal calculates the CSI of the horizontal dimension by adopting the adjusted interference correlation matrix or the interference signal power.

And the terminal feeds back the calculated horizontal dimension CSI information to the network equipment, wherein the information comprises RI, PMI and CQI.

And after receiving the CSI of the vertical dimension and the horizontal dimension fed back by the terminal, the network equipment calculates the link self-adaptive parameters.

Optionally, the network device determines a precoding matrix for data transmission for the entire antenna array using equation 11 above.

The third embodiment of the invention:

the network equipment configures a pilot resource of a vertical dimension and a pilot resource of a horizontal dimension for the terminal. Each pilot resource may have a separate subframe period and offset, or both pilot resources may be configured with the same subframe period and offset.

Optionally, the pilot signal in the vertical dimension is transmitted from one column of antennas, that is, the pilot signal in the vertical dimension is transmitted from each antenna unit of one column of antennas; the pilot signal in the horizontal dimension is transmitted from one row of antennas, that is, the pilot signal in the horizontal dimension is transmitted from each antenna unit of one row of antennas.

And the terminal measures the pilot signal of the vertical dimension to obtain the corresponding CSI of the vertical dimension and feeds the obtained CSI of the vertical dimension back to the network equipment. The CSI in the vertical dimension includes a PMI, and the PMI is a PMI when RI is fixed to be 1, that is, a precoding matrix corresponding to the PMI is a column vector or a row vector, and is used to notify a network device of a weighted value for performing single-stream beamforming in the vertical dimension.

Optionally, the terminal determines the beamforming gain in the vertical dimension by using any one of the first to eighth schemes, where the specific calculation formula refers to the above formulas 1 to 8, and details are not repeated here.

Optionally, the terminal feeds back the calculated beam forming gain G of the vertical dimension to the network device, and the network device obtains the beam forming gain G2 according to the received beam forming gain G and notifies the beam forming gain G2 to the terminal through a downlink signaling, where the downlink signaling is a physical layer signaling or a high layer signaling.

Optionally, the beam forming gain G2 obtained by the network device is equal to the beam forming gain G, or the beam forming gain G is adjusted by the network device to obtain the beam forming gain G2; for example, the beamforming gain G fed back by the terminal is quantized by 4 bits, and the network device may compress the beamforming gain G into 3 bits and notify the compressed beamforming G2 to the terminal, thereby being beneficial to saving the overhead of signaling resources.

Optionally, the terminal determines the CSI of the horizontal dimension by using any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a channel matrix of the horizontal dimension by measuring a pilot signal of the horizontal dimension, applies beam forming gain to the channel matrix of the horizontal dimension, and calculates CSI of the horizontal dimension, wherein the CSI of the horizontal dimension comprises RI, PMI and CQI.

Specifically, assume that the terminal obtains a second-dimensional channel matrix by measuring the second-dimensional pilot signal, and applies the beamforming gain to the second-dimensional channel matrix according to the following formula:

wherein,for applying the channel matrix after beamforming gain, H₂A channel matrix in a second dimension;

the terminal determines the CSI of the second dimension according to the channel matrix after the beamforming gain is applied; the CSI of the horizontal dimension calculated by the terminal reflects the forming gain brought by the vertical dimension precoding, so the RI and the CQI calculated by the method are more accurate.

The second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power and the CSI-RS power by using the vertical dimension wave beam forming gain, for example, the ratio of the network configuration data channel power and the CSI-RS power is Pc [ dB ], and the ratio after the vertical dimension wave beam forming gain adjustment is G + Pc [ dB ]; and the terminal calculates the CSI of the horizontal dimension by using the adjusted ratio.

The third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the beam forming gain G of the vertical dimension, and calculates the CSI of the horizontal dimension by using the adjusted interference estimation value. E.g. the interference correlation matrix estimated by the terminal, i.e. the covariance matrix, isThe adjusted interference correlation matrix is R/10^G/10(ii) a Or the interference signal power estimated by the terminal is sigma²Then the adjusted interference signal power is σ²/10^G/10(ii) a And the terminal calculates the CSI of the horizontal dimension by adopting the adjusted interference correlation matrix or the interference signal power.

And the terminal feeds back the calculated horizontal dimension CSI to the network equipment, wherein the CSI comprises RI, PMI and CQI.

And after receiving the CSI of the vertical dimension and the horizontal dimension fed back by the terminal, the network equipment calculates the link self-adaptive parameters.

Optionally, the network device determines a precoding matrix for data transmission for the entire antenna array using equation 11 above.

The fourth embodiment of the invention:

the network equipment configures a pilot resource of a vertical dimension and a pilot resource of a horizontal dimension for the terminal. Each pilot resource may have a separate subframe period and offset, or both pilot resources may be configured with the same subframe period and offset.

Optionally, the pilot signal in the vertical dimension is transmitted from one column of antennas, that is, the pilot signal in the vertical dimension is transmitted from each antenna unit of one column of antennas; the pilot signal in the horizontal dimension is transmitted from one row of antennas, that is, the pilot signal in the horizontal dimension is transmitted from each antenna unit of one row of antennas.

And the terminal measures the pilot signal of the vertical dimension to obtain the corresponding CSI of the vertical dimension and feeds the obtained CSI of the vertical dimension back to the network equipment. The CSI in the vertical dimension includes a PMI, and the PMI is a PMI when RI is fixed to be 1, that is, a precoding matrix corresponding to the PMI is a column vector or a row vector, and is used to notify a network device of a weighted value for performing single-stream beamforming in the vertical dimension.

Optionally, in the embodiment of the present invention, the beamforming gain in the vertical dimension may be determined by the terminal and fed back to the network device, or determined directly by the network device.

Specifically, the terminal determines the beamforming gain of the vertical dimension by using any one of the first to eighth schemes, and the specific calculation formula refers to the above formulas 1 to 8, which is not described herein again.

And after the terminal calculates and obtains the beam forming gain of the vertical dimension, the beam forming gain of the vertical dimension is fed back to the network equipment.

Or, the network device determines the beamforming gain in the vertical dimension by using the first scheme or the second scheme, where the specific calculation formula refers to formula 9 or formula 10, and details are not repeated here.

Optionally, the network device adjusts the transmit power of the pilot signal in the horizontal dimension according to the beamforming gain in the vertical dimension fed back by the terminal, for example, the original transmit power is P [ dBm ], and the transmit power adjusted by the beamforming gain is P + G [ dBm ].

And the terminal obtains the CSI of the horizontal dimension according to the measurement result of the pilot signal of the horizontal dimension, wherein the CSI of the horizontal dimension comprises RI, PMI and CQI. And the terminal feeds back the calculated horizontal dimension CSI information to the network equipment, wherein the information comprises RI, PMI and CQI. And after receiving the CSI of the vertical dimension and the horizontal dimension fed back by the terminal, the network equipment calculates the link self-adaptive parameters.

Optionally, the network device determines a precoding matrix for data transmission for the entire antenna array using equation 11 above.

For the above method flow, an embodiment of the present invention further provides a network device, and specific contents of the network device may be implemented with reference to the above method, which is not described herein again.

Fig. 4 is a schematic diagram of a network device according to an embodiment of the present invention, where the network device includes:

a receiving module 402, configured to receive first channel state information CSI, which is determined by a terminal through measurement of a first pilot signal; receiving second CSI which is determined by the terminal through measurement of a second pilot signal according to the first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal;

and a three-dimensional CSI determining module 404, configured to determine a three-dimensional CSI according to the first CSI and the second CSI.

Preferably, the first adjustment amount is determined by the terminal according to the measurement result of the first pilot signal.

Preferably, the method further comprises the following steps: an adjustment amount determining module 403, configured to determine a first adjustment amount according to the first CSI, and feed back the first adjustment amount to the terminal; or, the apparatus is configured to determine the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feed back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

Specifically, the terminal determines the first adjustment amount by using any one of the first to eighth schemes, and the specific calculation formula refers to the above formulas 1 to 8, which is not described herein again.

Specifically, the adjustment amount determining module 403 determines the first adjustment amount by using the following scheme one or scheme two, and the specific calculation formula refers to the above formula 9 or formula 10, which is not described herein again.

Preferably, the receiving module 402 is further configured to:

receiving the second CSI, which is determined by the terminal through measurement of the second pilot signal, wherein the second pilot signal is sent by the network equipment after the transmission power of the second pilot signal is adjusted according to the first adjustment amount; or,

and receiving the second CSI, wherein the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

Preferably, the method further comprises the following steps: a sending module 401, configured to send the first pilot signal through antenna units of a column of antennas, and send the second pilot signal through antenna units of a row of antennas; or, the antenna unit is configured to transmit the first pilot signal through the antenna unit of a row of antennas, and transmit the second pilot signal through the antenna unit of a column of antennas.

Preferably, the module for determining three-dimensional CSI 404 is further configured to:

a precoding matrix in the three-dimensional CSI is determined according to the above formula 11.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal dimension is a horizontal dimension pilot signal; or the first pilot signal dimension is a horizontal dimension pilot signal, and the second pilot signal dimension is a vertical dimension pilot signal.

For the above method flow, an embodiment of the present invention further provides a terminal, and specific contents of the terminal may be implemented by referring to the above method, which is not described herein again.

Fig. 5 is a schematic diagram of a terminal according to an embodiment of the present invention, where the terminal includes:

a processing module 501, configured to determine first channel state information CSI by measuring a first pilot signal; according to the first adjustment quantity, a second CSI is determined by measuring a second pilot signal; wherein the first adjustment amount is determined from measurements of the first pilot signal;

a sending module 502, configured to feed back the first CSI and the second CSI to the network device.

Preferably, the processing module 501 is further configured to:

determining the first adjustment amount according to the first CSI.

Preferably, the first adjustment amount is determined by the network device according to the first CSI and fed back to the processing module 501;

or, the processing module determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device through the sending module, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the processing module 501.

Specifically, the processing module 501 determines the first adjustment amount by using any one of the following schemes one to eight, and the specific calculation formula refers to the above formulas 1 to 8, which is not described herein again.

Preferably, the processing module 501 is further configured to:

determining the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or, determining the second CSI according to the first adjustment amount and a measurement result of a second pilot signal.

Preferably, the processing module 501 is further configured to: determining second CSI by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a second channel matrix by measuring the second pilot signal, and applies the forming gain to the second channel matrix according to the following formula:

wherein,for applying the shaped gain channel matrix, H₂Is a second channel matrix; the terminal determines the second CSI according to the channel matrix after the forming gain is applied;

the second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power to the CSI-RS power by using the forming gain, and determines the second CSI according to the adjusted ratio of the data channel power to the CSI-RS power;

the third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the forming gain, and determines the second CSI by using the adjusted interference estimation value.

Preferably, the first pilot signal is a vertical dimension pilot signal, and the second pilot signal dimension is a horizontal dimension pilot signal; or the first pilot signal dimension is a horizontal dimension pilot signal, and the second pilot signal dimension is a vertical dimension pilot signal.

From the above, it can be seen that: the method comprises the steps that first Channel State Information (CSI) and second CSI fed back by a terminal are received through network equipment; wherein the second CSI is determined according to a first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal; and the network equipment determines three-dimensional CSI according to the first CSI and the second CSI. The second CSI obtained by the method of the embodiment of the invention reflects the first adjustment amount, thereby matching with the actual transmission capability of the channel and improving the system performance.

It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (28)

1. A method for determining three-dimensional channel state information is characterized by comprising the following steps:

the method comprises the steps that network equipment receives first Channel State Information (CSI), wherein the first CSI is determined by a terminal through measurement of a first pilot signal;

the network equipment receives second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal according to the first adjustment quantity; the first adjustment amount is determined from a measurement result of the first pilot signal;

and the network equipment determines three-dimensional CSI according to the first CSI and the second CSI.

2. The method of claim 1, wherein the first adjustment amount is determined by the terminal based on measurements of the first pilot signal.

3. The method of claim 1, wherein the network device determines a first adjustment amount according to the first CSI, and feeds back the first adjustment amount to the terminal;

or, the network device determines the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feeds back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

4. The method of any of claims 1-3, wherein the network device receives second CSI, comprising:

the network equipment receives the second CSI, wherein the second CSI is determined by the terminal through measurement of a second pilot signal, and the second pilot signal is sent after the network equipment adjusts the transmission power of the second pilot signal according to the first adjustment amount; or,

the network equipment receives the second CSI, and the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

5. The method of claim 2, wherein the first adjustment amount is determined by the terminal using any one of the following schemes one to six;

the first scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;

the second scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|V{H}_1{W}_1\left|\right|}_F^2}{A{\left|\right|{\mathrm{VH}}_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the third scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{{\left|\right|H_1(:,k)\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁Is a first precoding matrix; h₁(k) is H₁The k-th column of (1);

the fourth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G＝CQI1–CQI2

wherein G is the first adjustment amount, CQI1 refers to CQI in the first CSI, and CQI2 refers to CQI of a single port;

the fifth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment quantity, RSRP1 refers to single-port RSRP, and RSRP2 refers to beamforming RSRP;

the sixth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

SINR 1-SINR 2 or G10 log₁₀(SINR1/SINR2)

Where G is the first adjustment amount, SINR1 is a signal to interference and noise ratio calculated under the assumption that a signal is transmitted from an antenna port corresponding to the first pilot signal, and SINR2 refers to a signal to interference and noise ratio of single-port transmission.

6. The method of claim 3, wherein the network device determines the first adjustment amount using one or two of the following;

the first scheme comprises the following steps:

the network equipment receives CQI in the first CSI fed back by the terminal and CQI of a single port;

the network equipment obtains a first signal interference noise ratio according to CQI mapping in the first CSI and obtains a second signal interference noise ratio according to the CQI mapping of the single port;

the network device determines the first adjustment amount according to the following formula:

G＝CQI1’–CQI2’

wherein G is the first adjustment amount, CQI1 'is a first signal to interference plus noise ratio, and CQI 2' is a second signal to interference plus noise ratio;

the second scheme comprises the following steps:

the network device determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to beamformed RSRP.

7. A method according to any one of claims 1 to 3, characterized in that the method further comprises:

the network equipment sends the first pilot signal through the antenna units of a column of antennas and sends the second pilot signal through the antenna units of a row of antennas; or

And the network equipment transmits the first pilot signal through the antenna units of a row of antennas and transmits the second pilot signal through the antenna units of a column of antennas.

8. The method of any one of claims 1 to 3, wherein the network device determining the three-dimensional CSI from the first CSI and the second CSI, comprises:

the network equipment determines a precoding matrix in the three-dimensional CSI according to the following formula:

$W=W_1\⊗W_2$ or $W=W_2\⊗W_1;$

Wherein W is a precoding matrix in the three-dimensional CSI, W₁Is a first precoding matrix, W₂For the second pre-coding matrix to be used,and the second precoding matrix is a precoding matrix corresponding to a second PMI in the second CSI.

9. The method according to any one of claims 1 to 3, wherein the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

10. A three-dimensional channel state information feedback method is characterized by comprising the following steps:

the terminal determines first Channel State Information (CSI) by measuring a first pilot signal and feeds the first CSI back to the network equipment;

the terminal determines second CSI by measuring a second pilot signal according to the first adjustment amount and feeds the second CSI back to the network equipment; the first adjustment amount is determined based on measurements of the first pilot signal.

11. The method of claim 10, wherein the terminal determines the first adjustment amount based on the first CSI.

12. The method of claim 10, wherein the first adjustment amount is determined by the network device based on the first CSI and fed back to the terminal;

or, the terminal determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the terminal.

13. The method according to any of claims 10 to 12, wherein the terminal determines the second CSI by measuring the second pilot signal according to the first adjustment amount, comprising:

the terminal determines the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or,

and the terminal determines the second CSI according to the first adjustment quantity and the measurement result of the second pilot signal.

14. The method of claim 13, wherein the terminal determining the second CSI based on the first adjustment and a measurement of a second pilot signal comprises:

the terminal determines second CSI by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a second channel matrix by measuring the second pilot signal, and applies the forming gain to the second channel matrix according to the following formula:

wherein,for applying the shaped gain channel matrix, H₂Is a second channel matrix; the terminal determines the second CSI according to the channel matrix after the forming gain is applied;

the second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power to the CSI-RS power by using the forming gain, and determines the second CSI according to the adjusted ratio of the data channel power to the CSI-RS power;

the third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the forming gain, and determines the second CSI by using the adjusted interference estimation value.

15. The method of claim 11, wherein the terminal determines the first adjustment amount using any one of the following schemes one to six;

the first scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{A{\left|\right|H_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;

the second scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|V{H}_1{W}_1\left|\right|}_F^2}{A{\left|\right|{\mathrm{VH}}_1\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁For the first precoding matrix, a is a constant, either a pre-defined value or configured by the network;is a receive beamforming vector, or a receive processing vector;

the third scheme comprises the following steps: the terminal determines the first adjustment amount by adopting the following formula:

$G=10\log 10\left(\frac{{\left|\right|H_1{W}_1\left|\right|}_F^2}{{\left|\right|H_1(:,k)\left|\right|}_F^2}\right)$

wherein G is the first adjustment amount,is a first channel matrix, N_rIs the number of receiving antenna units of the terminal, N₁Is the number of antenna ports, W, of the first pilot signal₁Is a first precoding matrix; h₁(k) is H₁The k-th column of (1);

the fourth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G＝CQI1–CQI2

wherein G is the first adjustment amount, CQI1 refers to CQI in the first CSI, and CQI2 refers to CQI of a single port;

the fifth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment quantity, RSRP1 refers to single-port RSRP, and RSRP2 refers to beamforming RSRP;

the sixth scheme comprises the following steps:

the terminal determines the first adjustment amount according to the following formula:

SINR 1-SINR 2 or G10 log₁₀(SINR1/SINR2)

Where G is the first adjustment amount, SINR1 is a signal to interference and noise ratio calculated under the assumption that a signal is transmitted from an antenna port corresponding to the first pilot signal, and SINR2 refers to a signal to interference and noise ratio of single-port transmission.

16. The method of claim 12, wherein the first adjustment amount is determined by the network device using scheme one or scheme two;

the first scheme comprises the following steps:

the network equipment receives CQI in the first CSI fed back by the terminal and CQI of a single port;

the network equipment obtains a first signal interference noise ratio according to CQI mapping in the first CSI and obtains a second signal interference noise ratio according to the CQI mapping of the single port;

the network device determines the first adjustment amount according to the following formula:

G＝CQI1’–CQI2’

wherein G is the first adjustment amount, CQI1 'is a first signal to interference plus noise ratio, and CQI 2' is a second signal to interference plus noise ratio;

the second scheme comprises the following steps:

the network device determines the first adjustment amount according to the following formula:

G-RSRP 2-RSRP 1 or G-10 log₁₀(RSRP2/RSRP1)

Wherein G is the first adjustment amount, RSRP1 refers to RSRP of the single port, and RSRP2 refers to beamformed RSRP.

17. The method according to any one of claims 10 to 12, wherein the first pilot signal is a vertical dimension pilot signal, and the second pilot signal is a horizontal dimension pilot signal; or the first pilot signal is a horizontal dimension pilot signal, and the second pilot signal is a vertical dimension pilot signal.

18. A network device, comprising:

the terminal comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving first Channel State Information (CSI), and the first CSI is determined by the terminal through measuring a first pilot signal; receiving second CSI which is determined by the terminal through measurement of a second pilot signal according to the first adjustment amount; the first adjustment amount is determined from a measurement result of the first pilot signal;

and the three-dimensional CSI module is used for determining the three-dimensional CSI according to the first CSI and the second CSI.

19. The network device of claim 18, wherein the first adjustment amount is determined by the terminal based on measurements of the first pilot signal.

20. The network device of claim 18, further comprising:

the adjustment quantity determining module is used for determining a first adjustment quantity according to the first CSI and feeding back the first adjustment quantity to the terminal; or, the apparatus is configured to determine the first adjustment amount according to a second adjustment amount determined and fed back by the terminal, and feed back the first adjustment amount to the terminal, where the second adjustment amount is determined by the terminal according to a measurement result of the first pilot signal.

21. The network device of any of claims 18-20, wherein the receiving module is further to:

receiving the second CSI, which is determined by the terminal through measurement of the second pilot signal, wherein the second pilot signal is sent by the network equipment after the transmission power of the second pilot signal is adjusted according to the first adjustment amount; or,

and receiving the second CSI, wherein the second CSI is determined by the terminal according to the first adjustment amount and the measurement result of a second pilot signal.

22. The network device of any one of claims 18 to 20, further comprising:

a sending module, configured to send the first pilot signal through antenna units of a column of antennas, and send the second pilot signal through antenna units of a row of antennas; or, the antenna unit is configured to transmit the first pilot signal through the antenna unit of a row of antennas, and transmit the second pilot signal through the antenna unit of a column of antennas.

23. The network device of any of claims 18-20, wherein the determine three-dimensional CSI module is further configured to:

determining a precoding matrix in the three-dimensional CSI according to the following formula:

$W=W_1\⊗W_2$ or $W=W_2\⊗W_1;$

Wherein W is a precoding matrix in the three-dimensional CSI, W₁Is a first precoding matrix, W₂For the second pre-coding matrix to be used,and the second precoding matrix is a precoding matrix corresponding to a second PMI in the second CSI.

24. A terminal, comprising:

the processing module is used for determining first Channel State Information (CSI) by measuring the first pilot signal; according to the first adjustment quantity, a second CSI is determined by measuring a second pilot signal; wherein the first adjustment amount is determined from measurements of the first pilot signal;

and the sending module is used for feeding back the first CSI and the second CSI to the network equipment.

25. The terminal of claim 24, wherein the processing module is further configured to:

determining the first adjustment amount according to the first CSI.

26. The terminal of claim 24, wherein the first adjustment amount is determined by the network device based on the first CSI and fed back to the processing module;

or, the processing module determines a second adjustment amount according to the first CSI, and feeds the second adjustment amount back to the network device through the sending module, so that the network device determines the first adjustment amount according to the second adjustment amount and feeds the first adjustment amount back to the processing module.

27. The terminal of any of claims 24 to 26, wherein the processing module is further configured to:

determining the second CSI by measuring the second pilot signal, wherein the second pilot signal is sent by the network equipment after adjusting the transmission power of the second pilot signal according to the first adjustment amount; or, determining the second CSI according to the first adjustment amount and a measurement result of a second pilot signal.

28. The terminal of claim 27, wherein the processing module is further configured to:

determining second CSI by adopting any one of the following schemes one to three;

the first scheme comprises the following steps:

the terminal obtains a second channel matrix by measuring the second pilot signal, and applies the forming gain to the second channel matrix according to the following formula:

wherein,for applying the shaped gain channel matrix, H₂Is a second channel matrix; the terminal determines the second CSI according to the channel matrix after the forming gain is applied;

the second scheme comprises the following steps:

the terminal adjusts the ratio of the data channel power to the CSI-RS power by using the forming gain, and determines the second CSI according to the adjusted ratio of the data channel power to the CSI-RS power;

the third scheme comprises the following steps:

and the terminal adjusts the interference estimation value by using the forming gain, and determines the second CSI by using the adjusted interference estimation value.