CN107317614B

CN107317614B - Method and device for measuring channel state information and sending reference signal

Info

Publication number: CN107317614B
Application number: CN201710419479.6A
Authority: CN
Inventors: 刘建琴
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2020-09-04
Anticipated expiration: 2033-12-31
Also published as: CN103746779A; WO2015101109A1; CN107317614A; CN107196749A; CN103746779B; CN107196749B

Abstract

Channel state information measurement and referenceA signal sending method and a device are provided, the method comprises the following steps: receiving reference signal configuration information sent by a sending device and reference signals of N configured reference signal ports, and performing Channel State Information (CSI) measurement based on the reference signals of the N configured reference signal ports, wherein N is>6, the N reference signal ports consist of M groups of reference signal ports, M>1 is ═ 1; the measuring of the Channel State Information (CSI) based on the reference signals of the configured N reference signal ports comprises the following steps: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

and obtaining a Channel Quality Indicator (CQI) according to the second precoding matrix. The scheme realizes the measurement of the channel state information.

Description

Method and device for measuring channel state information and sending reference signal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting channel state information measurement and a reference signal.

Background

In a wireless communication system, a transmitting end and a receiving end use a plurality of antennas in a spatial multiplexing mode to obtain a higher rate. Compared with a general spatial multiplexing method, an enhanced technology is as follows: the receiving end feeds back the channel state information to the sending end, and the sending end uses a plurality of pre-coding technologies for the sending signals according to the obtained channel state information, so that the transmission performance is greatly improved.

A sending end sends a predefined pilot signal, wherein the number of ports of the pilot signal is equal to the number of ports for sending data, and a receiving end measures Channel State Information (CSI) based on the predefined pilot signal sent by the sending end, wherein the CSI includes: a Precoding Matrix Indicator (PMI), a Channel Quality Indicator (CQI), and a Rank Indicator (RI), and a Precoding matrix Type Indicator (PTI), and the like.

In order to obtain higher average spectrum efficiency of a cell and improve coverage of a cell edge, a Long Term Evolution-Advanced (LTE-a) system supports up to 8 antennas in downlink on the basis of an existing LTE system, and in terms of codebook feedbackSome feedback enhancement techniques are proposed, mainly to enhance the feedback accuracy of the codebook. For one subband or a plurality of joint subbands needing to feed back channel state information, User Equipment (UE) feeds back two PMIs (PMI 1 and PMI2) to a base station, wherein the PMI1 corresponds to a code word W in a codebook C1₁PMI2 corresponds to codeword W in another codebook C2₂。

The base station end has the same information of C1 and C2 as the user equipment end, and after receiving PMI1 and PMI2, corresponding code words W are found from corresponding codebooks C1 and C2₁And W₂And obtaining a codebook corresponding to the virtual code word W. In a specific implementation, the sub-codebooks corresponding to different ranks may be defined as follows (here, only Rank1 and Rank2 are taken as examples):

TABLE 1 Rank1 codebook

TABLE 2 Rank2 codebook

When the above dual codebook structure is expressed in another form: w ═ W₁*W₂Here W₁Is a diagonal array of blocks, W₁＝＝[X 0；0X]X is a beam space consisting of 32 4-antenna Discrete Fourier Transform (DFT) beams, W₁A certain beam group formed for four adjacent beams in 32 beam spaces, Rank1, W2₁With 16 selectable beam groups, W₂For selecting a particular beam of the group of beams represented by W and performing phase rotation of both polarization directions.

As technology evolves, antenna sizes may expand from 8 to 16, 32, 64, and even hundreds, with corresponding increases in CSI measurement and feedback complexity as antenna sizes increase. If the previous CSI measurement pilot design approach is still followed, the measurement pilot overhead will multiply linearly with the increase in antenna size. As in the current design of 4-port CSI-RS resources in the LTE system, each port CSI-RS occupies 1 or 2 Resource elements in each Physical Resource Block (PRB), and when the antenna scale increases to tens or even hundreds, the number of Resource elements occupied by CSI-RS in each PRB is particularly large, which results in that the number of effective Resource elements actually available for data transmission is too small.

Disclosure of Invention

Embodiments of the present invention provide a method and an apparatus for channel state information measurement and reference signal transmission, which effectively improve resource utilization rate of data transmission.

A first aspect of an embodiment of the present invention provides a method for measuring channel state information, where the method includes:

receiving reference signal configuration information sent by sending equipment and reference signals of N configured reference signal ports;

performing Channel State Information (CSI) measurement based on the configured reference signals of the N reference signal ports, wherein N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1;

wherein the performing of CSI measurement based on the configured reference signals of the N reference signal ports includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

and obtaining a Channel Quality Indicator (CQI) according to the second precoding matrix.

In a first possible implementation manner of the first aspect of the embodiment of the present invention, the method further includes:

and feeding back a Precoding Matrix Indicator (PMI) corresponding to the second precoding matrix and the Channel Quality Indicator (CQI) to the sending equipment.

With reference to the first aspect of the embodiment of the present invention or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect of the embodiment of the present invention:

and the reference signals of the configured N reference signal ports are transmitted on the same subframe by the transmitting equipment.

With reference to the first aspect of the embodiment of the present invention, or the first or second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect of the embodiment of the present invention:

the number of reference signal ports of each group of ports in the M groups of reference signal ports is a prime number of the total number of antenna ports.

A second aspect of the embodiments of the present invention provides a method for sending a reference signal, where the method includes:

configuring N reference signal ports, wherein N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1;

sending reference signal configuration information of the N reference signal ports;

sending the reference signals of the configured N reference signal ports according to the configured N reference signal ports and the reference signal configuration information;

wherein, the reference signals of the configured N reference signal ports are used for the receiving device to perform channel state information, CSI, measurement on the reference signals of the configured N reference signal ports, and the method includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

obtaining a channel according to the second precoding matrixThe quality indication CQI.

In combination with the first possible implementation manner of the second aspect of the embodiment of the present invention, the method further includes:

and receiving a Precoding Matrix Indicator (PMI) corresponding to the second precoding matrix fed back by the receiving equipment and the Channel Quality Indicator (CQI), and performing precoding operation according to the PMI and the CQI.

With reference to the second aspect of the embodiment of the present invention, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect of the embodiment of the present invention:

and the reference signals of the configured N reference signal ports are transmitted on the same subframe.

With reference to the second aspect of the embodiment of the present invention, or the first or second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect of the embodiment of the present invention:

A third aspect of the embodiments of the present invention provides a channel state information measurement apparatus, where the apparatus includes: a transceiver and a processor respectively connected to the bus;

the transceiver is used for receiving reference signal configuration information sent by the sending equipment and reference signals of the configured N reference signal ports;

the processor is configured to perform CSI measurement based on reference signals of N configured reference signal ports received by the transceiver, where N > is 6, the N reference signal ports are formed by M groups of reference signal ports, and M > is1;

obtaining a Channel Quality Indicator (CQI) according to the second precoding matrix;

in a first possible implementation manner of the third aspect of the embodiment of the present invention:

the transceiver is further configured to feed back a precoding matrix indicator PMI and a channel quality indicator CQI corresponding to the second precoding matrix to the transmitting device.

With reference to the third aspect of the embodiment of the present invention, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect of the embodiment of the present invention, the transceiver is further configured to receive reference signals of the configured N reference signal ports, which are sent by the sending device on the same subframe.

With reference to the third aspect of the embodiment of the present invention, or the first or second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect of the embodiment of the present invention, the number of reference signal ports of each group of ports in the M groups of reference signal ports is a prime number of the total number of antenna ports.

A fourth aspect of the present invention provides a device for transmitting a reference signal, where the transmitting device includes: a processor and a transceiver respectively connected to the bus,

the processor is configured to configure N reference signal ports, where N > is 6, where the N reference signal ports are formed by M groups of reference signal ports, and M > is 1;

the transceiver is configured to send reference signal configuration information of the N reference signal ports configured by the processor, and send reference signals of the configured N reference signal ports according to the configured N reference signal ports and the reference signal configuration information; the method for measuring the CSI of the reference signals of the N configured reference signal ports by the receiving equipment includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWhich isWhere i is 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

In a first possible implementation manner of the fourth aspect of the embodiment of the present invention:

the transceiver is further configured to receive a precoding matrix indicator PMI and a channel quality indicator CQI, which correspond to the second precoding matrix and are fed back by the receiving device;

the processor is further configured to perform precoding operation according to a precoding matrix indicator PMI and a channel quality indicator CQI, which correspond to the second precoding matrix, received by the transceiver.

With reference to the fourth aspect of the embodiment of the present invention, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect of the embodiment of the present invention, the transceiver is specifically configured to send the reference signals of the configured N reference signal ports on the same subframe.

With reference to the fourth aspect of the embodiment of the present invention, or the first or second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect of the embodiment of the present invention:

the number of reference signal ports in each group of ports in the M groups of reference signal ports is a prime number of the total number of antenna ports.

A fifth aspect of the present invention provides a method for measuring channel state information, where the method includes:

performing Channel State Information (CSI) measurement on the reference signals of the configured N reference signal ports; wherein the N reference signal ports are composed of M groups of reference signal ports, and M > -1;

wherein, the measuring the channel state information based on the reference signals of the configured N reference signal ports comprises: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain a weighted value corresponding to each group of reference signal ports, and obtaining a first precoding matrix and/or a second precoding matrix according to the weighted value; obtaining a third pre-coding matrix according to the first pre-coding matrix and/or the second pre-coding matrix; obtaining a Channel Quality Indicator (CQI) according to the third precoding matrix;

in the first precoding matrix, a phase item is different between weighted values corresponding to any two groups of reference signal ports; and/or in the second precoding matrix, the weighted values corresponding to the two groups of reference signal ports are different by one phase item.

In a first possible implementation manner of the fifth aspect of the embodiment of the present invention, the method further includes:

and feeding back a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI) corresponding to the third precoding matrix to the sending equipment.

With reference to the fifth aspect of the embodiment of the present invention or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect of the embodiment of the present invention:

and N is less than or equal to the total number of antenna ports.

With reference to the fifth aspect of the embodiment of the present invention, or the first or second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect of the embodiment of the present invention, the phase term is

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

With reference to the fifth aspect of the present invention or any one of the first to third possible implementation manners of the fifth aspect, in a fourth possible implementation manner of the fifth aspect of the present invention, the obtaining a third precoding matrix according to the first precoding matrix and the second precoding matrix includes:

representing the third precoding matrix as:

wherein W is the third precoding matrix, W₁For the first precoding matrix, W₁The ith diagonal block in the group I corresponds to a weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M; w₂For the second pre-coding matrix to be used,

is the phase difference between the weighted value corresponding to the i +1 th group of reference signal ports and the weighted value corresponding to the 1 st group of reference signal ports.

With reference to the fifth aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the fifth aspect, in a fifth possible implementation manner of the fifth aspect of the embodiment of the present invention:

the obtaining a third precoding matrix according to the first precoding matrix and the second precoding matrix includes: representing the third precoding matrix as:

wherein W is the third precoding matrix, W₁For the first precoding matrix, W₂For the second precoding matrix, W₂The ith row in the group I corresponds to a weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M;

A sixth aspect of the present invention provides a method for sending a reference signal, where the method includes:

configuring reference signals of N reference signal ports, wherein N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1;

sending the reference signal configuration information of the configured N reference signal ports, and sending reference signals according to the configured N reference signal ports and the reference signal configuration information;

the reference signal is used for the receiving equipment to measure Channel State Information (CSI) based on the reference signals of the configured N reference signal ports, so as to obtain a third precoding matrix determined according to the first precoding matrix and/or the second precoding matrix, and obtain a Channel Quality Indicator (CQI) according to the third precoding matrix;

wherein the receiving device performs CSI measurement based on the configured reference signals of the N reference signal ports, and includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain a weighted value corresponding to each group of reference signal ports, and obtaining the first precoding matrix and/or the second precoding matrix according to the weighted value;

in the first precoding matrix, the weighted values corresponding to any two groups of reference signal ports have a phase difference; and/or in the second pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports have a phase difference.

In a first possible implementation manner of the sixth aspect of the embodiment of the present invention, the method further includes:

and receiving a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI) corresponding to the third precoding matrix fed back by the receiving equipment, and performing precoding operation according to the PMI and the CQI.

With reference to the sixth aspect of the embodiment of the present invention or the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect of the embodiment of the present invention:

and N is less than or equal to the total number of antenna ports.

In connection with the practice of the inventionExample the sixth aspect, or any one of the first to the second possible implementation manners of the sixth aspect, in a third possible implementation manner of the sixth aspect of the embodiment of the present invention, the phase term is

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

With reference to the sixth aspect of the present embodiment, or any one of the first to third possible implementation manners of the sixth aspect, in a fourth possible implementation manner of the sixth aspect of the present embodiment,

the third precoding matrix is represented as:

With reference to the sixth aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the sixth aspect, in a fifth possible implementation manner of the sixth aspect of the embodiment of the present invention:

the third precoding matrix is represented as:

wherein W is the thirdPrecoding matrix, W₁For the first precoding matrix, W₂For the second precoding matrix, W₂The ith row in the group I corresponds to a weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M;

A seventh aspect of the present invention provides a channel state information measurement apparatus, including: a transceiver and a processor respectively connected to the bus;

the processor is configured to perform CSI measurement on reference signals of the configured N reference signal ports received by the transceiver; wherein the N reference signal ports are composed of M groups of reference signal ports, and M > -1;

in the first precoding matrix, a phase item is different between weighted values corresponding to any two groups of reference signal ports; and/or in the second precoding matrix, the weighted values corresponding to any two groups of reference signal ports are different by one phase item.

In a first possible implementation manner of the seventh aspect of the embodiment of the present invention:

the transceiver is further configured to feed back, to the sending device, a precoding matrix indicator PMI and a channel quality indicator CQI, which are obtained by the processor and correspond to the third precoding matrix.

With reference to the seventh aspect of the embodiment of the present invention or the first possible implementation manner of the seventh aspect, in a second possible implementation manner of the seventh aspect of the embodiment of the present invention:

and N is less than or equal to the total number of antenna ports.

With reference to the seventh aspect of the embodiment of the present invention, or any one of the first to the second possible implementation manners of the seventh aspect, in a third possible implementation manner of the seventh aspect of the embodiment of the present invention, the phase term is

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

With reference to the seventh aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the seventh aspect, in a fourth possible implementation manner of the seventh aspect of the embodiment of the present invention,

the processor is specifically configured to represent the third precoding matrix as:

With reference to the seventh aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the seventh aspect, in a fifth possible implementation manner of the seventh aspect of the embodiment of the present invention,

An eighth aspect of the embodiments of the present invention provides a device for sending a reference signal, where the device includes: a transceiver and a processor respectively connected to the bus,

the processor is used for configuring reference signals of N reference signal ports, wherein N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1;

the transceiver is configured to send reference signal configuration information of the N reference signals configured by the processor, and send reference signals according to the configured N reference signal ports and the reference signal configuration information;

in the first pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports have a phase difference; and/or in the second pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports are different by one phase item.

In a first possible implementation manner of the eighth aspect of the embodiment of the present invention:

the transceiver is further configured to receive a precoding matrix indicator PMI and a channel quality indicator CQI, which correspond to the third precoding matrix and are fed back by the receiving device;

the processor is further configured to perform precoding operation according to the PMI and the CQI received by the transceiver.

With reference to the eighth aspect of the embodiment of the present invention or the first possible implementation manner of the eighth aspect, in a second possible implementation manner of the eighth aspect of the embodiment of the present invention,

and N is less than or equal to the total number of antenna ports.

With reference to the eighth aspect of the embodiment of the present invention or any one of the first to the second possible implementation manners of the eighth aspect, in a third possible implementation manner of the eighth aspect of the embodiment of the present invention, the phase term is

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

With reference to the eighth aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the eighth aspect, in a fourth possible implementation manner of the eighth aspect of the embodiment of the present invention,

the third precoding matrix is represented as:

wherein W is the third precoding matrix, W₁For the first precoding matrix, W₁The ith diagonal block in the group I corresponds to the weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M; w₂For the second pre-coding matrix to be used,

With reference to the eighth aspect of the embodiment of the present invention, or any one of the first to third possible implementation manners of the eighth aspect, in a fifth possible implementation manner of the eighth aspect of the embodiment of the present invention,

the third precoding matrix is represented as:

The embodiment of the invention provides a method and a device for measuring channel state information, which are designed by utilizing the correlation of CSI measurement pilot frequency, thereby greatly reducing the overhead of measurement pilot frequency, and effectively improving the resource utilization rate of data transmission particularly along with the increase of the antenna scale.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a simplified flowchart of a channel state information measurement method according to an embodiment of the present invention;

fig. 2 is a flow chart of a reference signal transmission method according to a second embodiment of the present invention;

fig. 3 is a schematic diagram of an antenna array according to a third embodiment of the present invention;

fig. 4 is a schematic diagram of another antenna array provided in a third embodiment of the present invention;

fig. 5 is a schematic diagram of a channel state information measuring apparatus according to a fourth embodiment of the present invention;

fig. 6 is a schematic diagram of a reference signal transmitting apparatus according to a fifth embodiment of the present invention;

fig. 7 is a simplified flowchart of a channel state information measurement method according to a sixth embodiment of the present invention;

fig. 8 is a simplified flow chart of a reference signal transmission method according to a seventh embodiment of the present invention;

FIG. 9 is a schematic diagram of an antenna array divided into 4 equal antenna groups according to an eighth embodiment of the present invention;

fig. 10 is a schematic diagram of the co-phase of the precoding matrix information of the first two antenna groups and the precoding matrix information of the last two antenna groups in the eighth embodiment of the present invention;

fig. 11 is a schematic view of the phase difference when the phase difference information is reflected in W1 in the eighth embodiment of the present invention;

fig. 12 is a schematic view of phase difference when phase difference information is reflected in W2 in embodiment nine of the present invention;

fig. 13 is a simplified schematic diagram of a channel state information measurement apparatus according to a tenth embodiment of the present invention;

fig. 14 is a schematic diagram of a reference signal transmitting apparatus according to an eleventh embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With the increase of the number of antenna ports, the whole antenna array is divided into a plurality of groups, corresponding pilot measurement is performed according to the correlation of each antenna group, and CSI information measurement (including precoding matrix indicator PMI, channel quality indicator CQI, and the like) on the corresponding ports of the whole antenna array can be realized by using less pilot measurement.

Example one

An embodiment of the present invention provides a method for measuring channel state information, where the method of this embodiment is a method executed by a receiving device, such as a user equipment or a base station, for receiving a signal, and a flowchart is shown in fig. 1, where the method includes:

step A1, receiving reference signal configuration information sent by a sending device, and receiving reference signals of N configured reference signal ports; the sending device may be a device for sending a signal, such as a user equipment or a base station, and the sending device corresponds to a receiving device for executing the method of the embodiment, for example, when the sending device is a user equipment, the receiving device is a base station, and when the sending device is a base station, the receiving device is a user equipment.

Step a2, performing CSI measurement on reference signals of N configured reference signal ports, where N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1. The reference signal configuration information refers to necessary information for the sending device to send reference signals on the configured N reference signal ports, such as the number of the reference signal ports, the port number, time-frequency resource information occupied by each reference signal port, grouping information of how M groups of reference signal ports are grouped, and the like, and the receiving device needs to receive the reference signals of the N reference signal ports according to the reference signal configuration information.

The reference signals of the N reference signal ports configured in step a1 may be transmitted on the same subframe by the transmitting device. It should be further noted that the number of reference signal ports of each group of ports in the M groups of reference signal ports may be a prime number of the total number of antenna ports. Here, the total number of antenna ports may be the total number of antenna ports in the transmission of service data in the same cell or the total number of antenna ports corresponding to the base station side antenna configuration.

The step a2 of performing CSI measurement based on the reference signals of the configured N reference signal ports may be implemented by the following steps a21 to a23, specifically:

step A21, CSI measurement is respectively carried out on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M;

step a22, obtaining a second precoding matrix W according to the first precoding matrix:

namely, the second precoding matrix W is obtained by direct product of M first precoding matrices;

step A23, obtaining the CQI as the channel quality indicator according to the second precoding matrix.

Further, in other specific embodiments, the receiving device may feed back, to the sending device, a precoding matrix indicator PMI and a channel quality indicator CQI, which are obtained by measurement and correspond to the second precoding matrix; so that the transmitting device can perform precoding operation according to the PMI and the CQI.

In the method for measuring channel state information provided in the embodiments of the present invention, the number of ports configured by a sending device (i.e. the number of the M groups of ports) is much smaller than the number of ports when the sending device actually transmits data, for example, the number of ports when the sending device actually transmits data is 32, in the embodiments of the present invention, 5 groups of reference signal ports (each group includes 2 reference signal ports, and 10 reference signal ports are total) can be finally obtained by effectively grouping and virtually weighting 32 ports, so that the receiving device only needs to measure channel state information for the reference signals of the 10 ports, compared with the prior art in which the receiving device needs to measure CSI for the reference signals of all ports when the sending device actually transmits data, the method in the embodiments of the present invention greatly reduces the overhead of measuring pilots, especially, along with the increase of the antenna scale, the resource utilization rate of data transmission is effectively improved.

Example two

An embodiment of the present invention provides a method for sending a reference signal, where the method is performed by a sending device, such as a user equipment or a base station, for sending a signal, and the method in this embodiment is performed by the sending device corresponding to a receiving device described in the method in the first embodiment, where the receiving device may be a device, such as a user equipment or a base station, for receiving a signal, and the receiving device corresponds to the sending device for performing the method in this embodiment, for example, when the sending device is the user equipment, the receiving device is the base station, and when the sending device is the base station, the receiving device is the user equipment.

Fig. 2 shows a flowchart of the method in this embodiment, and the method includes:

and step B1, configuring N reference signal ports, wherein N > is 6, the N reference signal ports are composed of M groups of reference signal ports, and M > is 1.

Step B2, sending reference signal configuration information of N reference signal ports, and sending reference signals of the N reference signal ports according to the configured N reference signal ports and the reference signal configuration information of the reference signal ports; the reference signal configuration information refers to necessary information for the sending device to send reference signals on the configured N reference signal ports, such as the number of the reference signal ports, the port number, time-frequency resource information occupied by each reference signal port, grouping information of how M groups of reference signal ports are grouped, and the like, and the receiving device needs to receive the reference signals of the N reference signal ports according to the reference signal configuration information.

The above-configured reference signals of the N reference signal ports are used for the receiving device to perform CSI measurement, and include: respectively carrying out CSI measurement on the reference signal ports of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding:

It should be further noted that the reference signals of the configured N reference signal ports may be sent on the same subframe. The number of reference signal ports in each of the M sets of reference signal ports may be a prime number of the total number of antenna ports. Here, the total number of antenna ports may be the total number of antenna ports in the transmission of service data in the same cell or the total number of antenna ports corresponding to the base station side antenna configuration.

In the method for sending a reference signal provided in the embodiments of the present invention, a design is performed by using a correlation of CSI measurement pilots, so that the number N of ports (i.e., the number of the M groups of ports) configured by a sending device is much smaller than the number of ports when the sending device actually transmits data, and thus, a receiving device only needs to perform channel state information measurement on reference signals of the M groups of ports.

EXAMPLE III

The embodiment of the invention provides a channel state information measuring method.

Before explaining the scheme provided by the embodiment of the present invention, it is to be understood that precoding matrix indications of all antenna portsA symbol (PMI) which is a Precoding Matrix Indicator (PMI) of a plurality of antenna port groups_m(wherein, PMI)_mPrecoding matrix indicators representing the mth group of antenna ports) are obtained jointly, so that antenna ports of Channel State Information Reference signals (CSI-RS) dedicated to Channel State Information measurement can be divided into multiple antenna port groups of different levels, and the precoding matrix indicators of the antenna port groups of different levels are obtained through measurement, thereby obtaining the total precoding matrix indicator of all antenna ports. See the following equation:

and measuring the precoding matrix indicators of the CSI-RS ports of different levels is equivalent to performing multi-step disassembly and grouping on the measurement reference signals on a spatial domain. Specifically, taking the total number of antenna ports 64 of the transmitting device as an example, 32 antenna ports in the same polarization direction are divided into 5 groups, where each physical antenna port or virtual antenna port in the same polarization direction in each turn forms one port group. And all 64 antenna ports are divided into 6 groups, and the number of physical or virtual antenna ports of each group is 2, i.e., 64 ═ 2 × 2 (2 × 2) × 2. The detailed description is as follows:

the antenna ports of the first group are composed of two horizontally oriented antenna ports with the same polarization direction, for example, a positive 45-degree polarization direction. As in the horizontal elliptical dashed box 1 in fig. 3 for 2 horizontal directional antenna ports with positive 45 degree polarization direction.

The second group of antenna ports consists of two vertical antenna ports with the same polarization direction, such as 2 vertical antenna ports with positive 45-degree polarization direction in the vertical oval dashed box 2 in fig. 3.

The CSI measurements (including precoding matrix indicator and channel quality indicator, etc.) of the first and second groups of antenna ports can ensure that channel state information (e.g., precoding matrix indicator: PMI1, etc.) of the first-stage reference signal antenna ports spanned by the horizontal-to-2 antenna ports and the vertical-to-2 antenna ports is obtained.

The third group of antenna ports consists of two horizontal first virtual antenna ports, wherein the first virtual antenna ports are obtained by omnidirectional weighting of the first-stage reference signal antenna ports. For example, all the reference signal antenna ports in circle 3 of fig. 3 are virtually weighted to obtain the first horizontal virtual port of the second stage, while all the reference signal antenna ports in circle 4 are virtually weighted to obtain the second horizontal virtual port, and the first horizontal virtual port and the second virtual port are combined into the third group of antenna ports.

The fourth group of antenna ports consists of two vertical first virtual antenna ports, wherein the first virtual antenna ports are obtained by omnidirectional weighting of the first-stage reference signal antenna ports. For example, all the reference signal antenna ports in circle 3 of fig. 3 are virtually weighted to obtain a first vertical virtual port of the second stage, while all the reference signal antenna ports in circle 5 are virtually weighted to obtain a second vertical virtual port of the second stage, and the first vertical virtual port and the second virtual port are combined to form a fourth set of antenna ports.

CSI (including precoding matrix indicator and channel quality indicator) measurements of the third and fourth groups of antenna ports can ensure that channel state information (e.g., precoding matrix indicator (PMI2) and the like) of the second-stage reference signal antenna ports, which are spanned by the two horizontally oriented first virtual ports and the two vertically oriented first virtual ports, is obtained.

The fifth group of antenna ports consists of two second virtual antenna ports in the horizontal direction, and the second virtual antenna ports are obtained by omnidirectional weighting of the second-stage pilot antenna ports. That is, all the reference signal antenna ports in the circle 11 of fig. 3 are virtually weighted to obtain the first horizontal virtual port of the third level, all the reference signal antenna ports in the circle 12 are virtually weighted to obtain the second horizontal virtual port of the third level, and the first horizontal virtual port and the second horizontal virtual port of the third level form the fifth group of antenna ports.

The antenna ports of the sixth group are composed of two third virtual antenna ports, where the first third virtual antenna port corresponds to an antenna port obtained by virtually weighting all antenna ports in the first polarization direction, and the second third virtual antenna port corresponds to an antenna port obtained by virtually weighting all antenna ports in the second polarization direction.

Thus, the first-order dimension of the total precoding matrix information corresponds to 2 × 2 basic antenna blocks of one of the antenna arrays (4 antenna arrays with +45 degree polarization direction as shown by the smallest circle in fig. 4); the second-order dimension of the total precoding matrix information corresponds to one (2 × 2) × (2 × 2) basic antenna block (e.g., 16 + 45-degree polarization antenna arrays composed of four small circles as shown in the second large circle in fig. 4) composed of the first-order dimension; the third-level dimension of the total precoding matrix information corresponds to a basic block formed by the second-level dimension in the antenna array (the maximum circle formed by two next-level circles in the lower figure, since the number of the next-level circles is not enough to form a complete third-level dimension, so that the antenna array corresponding to the third-level dimension is a two-dimensional extension (2 × 2) ((2 × 2) () 2) of the antenna array block (2 × 2) corresponding to the second-level dimension in the horizontal direction, and thus the obtained total precoding information in the first polarization direction (i.e., the third-level precoding) is re-expanded to obtain precoding matrix information 64 ═ 2) ((2 × 2) () 2) in all polarization directions.

With the above-described grouping scheme, the number of CSI-RS ports (including physical antenna ports and virtual antenna ports) to be measured is shown in fig. 4, that is, the antenna ports marked with numbers in fig. 4, where the physical antenna ports include: 4 antenna ports numbered 1,2, 3, 4, the virtual antenna ports include with the circle in fig. 4: and the virtual antenna ports are numbered 5, 6, 7, 8, 9, 10, 11 and 12, and the CSI-RS port represented by each circle is the virtual antenna port after omnidirectional virtual weighting.

Due to the correlation among the antenna port groups, the total number of CSI-RS ports required by CSI measurement is the sum of the decomposed numbers of the CSI-RS ports of each stage or each group. Further, the number of CSI-RS ports required for CSI measurement is the sum of all the smallest prime numbers decomposed from the total number of ports, such as when the total number of ports is 24, since 24 can be decomposed into: 24 × 2 × 3, the number of CSI-RS ports required for CSI measurement is therefore 2+2+2+ 3. Considering that the total number of antenna ports under the LTE and LTE-A systems is a power of 2, the total number of antenna ports at the transmitting end is assumed to be 2^ n, while the number of CSI-RS ports required to be measured by the scheme is only 2 x n. Thus, the scheme greatly reduces the complexity of pilot design and pilot overhead.

In light of the above description of the scheme provided by embodiments of the present invention, the scheme is for N of the configurations (where, in general, N is>6), performing CSI measurement on N configured CSI-RS ports simultaneously in one subframe, dividing the N CSI-RS ports into M groups according to a predefined criterion, wherein M is an integer greater than zero, and performing CSI measurement according to the CSI-RS ports (ports) in each group to obtain a first precoding matrix W_m：W_mAnd M is 1, …, M, and further according to the first precoding matrix, obtaining a second precoding matrix W:

and obtaining CQI according to the second precoding matrix, and finally feeding back the second precoding matrix PMI and the CQI to sending equipment.

Specifically, taking the total antenna port number 64 as an example, each of the M groups includes 2 CSI-RS ports, in the method provided in the embodiment of the present invention:

(1) performing CSI measurement according to the 2 CSI-RS ports in each group to obtain a first precoding matrix:

r

_m1, 2; where m is the mth first precoding matrix and r_mThe rank of the mth first precoding matrix.

(2) Obtaining a second precoding matrix W according to the first precoding matrix:

example four

An embodiment of the present invention provides a device for measuring channel state information, that is, a receiving apparatus described in the first embodiment, as shown in fig. 5, where the device includes: a transceiver 501 and a processor 502 respectively connected to the bus; the reference signal configuration information refers to necessary information for the sending device to send reference signals on the configured N reference signal ports, such as the number of the reference signal ports, the port number, time-frequency resource information occupied by each reference signal port, grouping information of how M groups of reference signal ports are grouped, and the like, and the receiving device needs to receive the reference signals of the N reference signal ports according to the reference signal configuration information.

The transceiver 501 is configured to receive reference signal configuration information sent by a sending device and reference signals of N configured reference signal ports;

the processor 502 is configured to perform CSI measurement based on reference signals of N configured reference signal ports received by the transceiver 501, where N > is 6, the N reference signal ports are formed by M groups of reference signal ports, and M > is1.

obtaining a Channel Quality Indicator (CQI) according to the second pre-coding matrix;

optionally, the transceiver 501 is further specifically configured to receive the reference signals of the configured N reference signal ports, which are sent by the sending device on the same subframe. Optionally, the number of reference signal ports of each group of ports in the M groups of reference signal ports is a prime number of the total number of antenna ports.

Further, in other specific embodiments, the transceiver 501 is further configured to feed back a precoding matrix indicator PMI and a channel quality indicator CQI corresponding to the second precoding matrix to the transmitting device, so that the transmitting device performs precoding.

The channel state information measurement device provided in the embodiment of the present invention is designed by using the correlation of the CSI measurement pilot, so that the number of ports (i.e. the M groups) configured by the sending device is much smaller than the number of ports when the sending device actually transmits data, and thus, finally, the processor 502 of the device in this embodiment only needs to perform channel state information measurement on the reference signals of the M groups of ports.

EXAMPLE five

An embodiment of the present invention provides an apparatus for sending a reference signal, that is, the sending device in the second embodiment, as shown in fig. 6, where the apparatus includes: a processor 601 and a transceiver 602 respectively connected to the bus,

the processor 601 is configured to configure N reference signal ports, where N > is 6, where the N reference signal ports are formed by M groups of reference signal ports, and M > is 1;

the transceiver 602 is configured to send reference signal configuration information of the N reference signal ports configured by the processor 601, and send reference signals of the configured N reference signal ports according to the configured N reference signal ports and the reference signal configuration information; the reference signal configuration information refers to necessary information for the sending device to send reference signals on the configured N reference signal ports, such as the number of the reference signal ports, the port number, time-frequency resource information occupied by each reference signal port, grouping information of how M groups of reference signal ports are grouped, and the like, and the receiving device needs to receive the reference signals of the N reference signal ports according to the reference signal configuration information.

The method for measuring the Channel State Information (CSI) of the reference signals of the N configured reference signal ports by the receiving equipment includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i is 1,2, …,m; obtaining a second precoding matrix W according to the first precoding:

Further, the transceiver 602 in this embodiment is further configured to receive a precoding matrix indicator PMI and a channel quality indicator CQI, which correspond to a second precoding matrix fed back by the receiving device; the processor 601 is further configured to perform precoding operation according to a precoding matrix indicator PMI and a channel quality indicator CQI, which correspond to the second precoding matrix received by the transceiver 601.

Optionally, the transceiver 602 is specifically configured to send the reference signals of the configured N reference signal ports on the same subframe. Optionally, the number of reference signal ports of each group of ports in the M groups of reference signal ports is a prime number of the total number of antenna ports.

The sending apparatus of reference signal provided in the embodiment of the present invention is designed by using the correlation of CSI measurement pilot, so that the number of ports (i.e. M groups) configured by the processor 601 of the apparatus in this embodiment is much smaller than the number of ports when data is actually transmitted, and thus, finally, the receiving device only needs to perform channel state information measurement on the reference signals of the M groups of ports.

EXAMPLE six

An embodiment of the present invention provides a method for measuring channel state information, where the method in this embodiment is another method for measuring channel state information, which is executed by a receiving device, and as shown in fig. 7, the method includes:

and step C1, receiving the reference signal configuration information sent by the sending device and the reference signals of the configured N reference signal ports. Wherein, the value of N may be less than or equal to the total number of antenna ports. The sending device may be a device for sending a signal, such as a user equipment or a base station, and the sending device corresponds to a receiving device for executing the method of the embodiment, for example, when the sending device is a user equipment, the receiving device is a base station, and when the sending device is a base station, the receiving device is a user equipment.

Step C2, performing CSI measurement on the reference signals of the configured N reference signal ports; wherein the N reference signal ports are composed of M groups of reference signal ports, and M > -1.

Wherein the performing of the CSI measurement based on the configured reference signals of the N reference signal ports may specifically be performed through the following steps C21 to C23, specifically,

step C21, performing CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports, respectively, to obtain a weighted value corresponding to each group of reference signal ports, and obtaining a first precoding matrix and/or a second precoding matrix according to the weighted value, so that the weighted value corresponds to a certain component in the first precoding matrix and/or the second precoding matrix. In the first pre-coding matrix, the difference between weighted values corresponding to any two groups of reference signal ports is a phase item; and/or, in the second precoding matrix, the weighted values corresponding to the two groups of reference signal ports are different by one phase item. Wherein the phase term is

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

And step C22, obtaining a third precoding matrix according to the first precoding matrix and/or the second precoding matrix obtained in the step C21. Specifically, the third precoding matrix may be obtained by performing a certain operation on the first precoding matrix and/or the second precoding matrix.

Specifically, when the first precoding matrix is obtained according to the weighting values, two arbitrary groups of the first precoding matrix need to be obtainedIf the final precoding matrix adopts a dual codebook structure, the third precoding matrix can be obtained by performing an operation (mainly, multiplication) on the first precoding matrix and another precoding matrix if the final precoding matrix adopts a dual codebook structure, where the another precoding matrix can adopt a codebook structure of the third Generation Partnership Project (3 GPP) version 8 or 10, such as multiplexing a codebook in the dual codebook structure of version 10, and the first precoding matrix W is different from the weighted values corresponding to the reference signal ports by a phase term₁Can be as follows:

or

Wherein, W_1i(i-1, 2, … M) is a component of the ith group of reference signal ports in the first precoding matrix, which may include weights for the reference signal ports, for adjusting the phase of the transmitted signal.

Obtaining a second precoding matrix W according to the weighted values₂In the second precoding matrix, if a phase difference is required between weighted values corresponding to any two groups of reference signal ports, and a third precoding matrix is obtained according to the second precoding matrix, if the final precoding matrix adopts a dual-codebook structure, another precoding matrix and the second precoding matrix W can be used₂Performing an operation (mainly multiplying) to obtain a third precoding matrix, where another precoding matrix may adopt a codebook structure of 3GPP release 8 or 10, such as multiplexing one codebook in a form of a dual codebook structure of release 10, where the second precoding matrix W₂Is similar to the structure of the first precoding matrix described above.

Obtaining a first precoding matrix W according to the weighted values₁And a second precoding matrix W₂In the second pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports are required to have a phase difference, and in the first pre-coding matrix, any two groups of reference signal ports are required to have a phase differenceThe weighted values corresponding to the group reference signal ports differ by one phase term. When a third pre-coding matrix is obtained according to the first pre-coding matrix and the second pre-coding matrix, if the final pre-coding matrix adopts a double codebook structure, the first pre-coding matrix W can be used as the first pre-coding matrix W₁And a second precoding matrix W₂And (4) performing operation (mainly multiplying) to obtain a third precoding matrix.

Step C23, obtaining a Channel Quality Indicator (CQI) according to the third pre-coding matrix;

further, in this embodiment, after the third precoding matrix is obtained, a precoding matrix indicator PMI and a channel quality indicator CQI corresponding to the third precoding matrix may be fed back to the transmitting device, so that the transmitting device performs precoding operation according to the PMI and the CQI.

Optionally, when the third precoding matrix is obtained according to the first precoding matrix and the second precoding matrix in step C22, the third precoding matrix may be specifically represented as:

where W is a third precoding matrix, W₁Is a first precoding matrix, W₁The ith diagonal block in the group I corresponds to a weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M; w₂For the second pre-coding matrix to be used,

Or, optionally, when a third precoding matrix is obtained according to the first precoding matrix and the second precoding matrix in step C21, specifically, the third precoding matrix is represented as:

whereinW is a third precoding matrix, W₁Is a first precoding matrix, W₂Is a second precoding matrix, W₂The ith row in the group I corresponds to a weighted value corresponding to the ith group of reference signal ports, wherein the value of i is 1 to M;

The method for measuring channel state information provided by the embodiment of the invention is designed by utilizing the correlation among CSI measurement reference signal ports, so that the number of ports (namely M groups) configured by the sending equipment is smaller than the number of ports when the sending equipment actually transmits data, and finally the receiving equipment only needs to measure the channel state information of the reference signals of the M groups of ports.

EXAMPLE seven

An embodiment of the present invention provides a method for sending a reference signal, where the method of this embodiment is a method executed by a sending device, and is a method executed by a sending device corresponding to a receiving device in the method described in the sixth embodiment, where the receiving device may be a device for receiving a signal, such as a user equipment or a base station, and the receiving device corresponds to the sending device for executing the method of this embodiment, for example, when the sending device is the user equipment, the receiving device is the base station, and when the sending device is the base station, the receiving device is the user equipment.

Fig. 8 shows a flowchart of the method in this embodiment, where the method includes:

step D1, configuring reference signals of N reference signal ports, where the N reference signal ports are formed by M groups of ports, and M > -1;

and step D2, sending the reference signal configuration information of the configured N reference signal ports, and sending reference signals according to the configured N reference signal ports and the reference signal configuration information, wherein the reference signals are used for the receiving equipment to perform Channel State Information (CSI) measurement based on the configured reference signals of the N reference signal ports, so as to obtain a third precoding matrix determined according to the first precoding matrix and/or the second precoding matrix, and obtain Channel Quality Indication (CQI) according to the third precoding matrix. The process of the receiving device specifically obtaining the third precoding matrix may be as described in the sixth embodiment, which is not described herein again.

Wherein the receiving device performs CSI measurement based on the configured reference signals of the N reference signal ports, and includes: and respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain a weighted value corresponding to each group of reference signal ports, and obtaining the first precoding matrix and/or the second precoding matrix according to the weighted value, so that the weighted value is a certain component in the first precoding matrix and/or the second precoding matrix.

In the first precoding matrix, the difference between weighted values corresponding to any two groups of reference signal ports is a phase item; and/or in the second pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports have a phase difference; the obtained third precoding matrix may be obtained by performing a certain operation on the first precoding matrix and the second precoding matrix, which is specifically shown in the sixth embodiment, and is not described herein again. The phase term may be

In the form of (1), wherein

Is [0,2 π ]]An angle therebetween.

It should be noted that the value of N may be less than or equal to the total number of antenna ports.

Further, the sending device of this embodiment may further receive an indicator PMI and a channel quality indicator CQI corresponding to a third precoding matrix fed back by the receiving device; a precoding operation is performed according to the PMI and the CQI.

The sending method of the reference signal provided by the embodiment of the invention is designed by utilizing the correlation of the CSI measurement pilot frequency, and particularly, M groups of reference signal ports can be configured by sending equipment, while receiving equipment only needs to measure the channel state information of the reference signals of the M groups of reference signal ports, and the number of the M groups of reference signal ports is less than that of the ports when the data is actually transmitted, so that compared with the prior art that receiving equipment needs to measure the CSI of the reference signals of all the ports when the sending equipment actually transmits the data, the method provided by the embodiment of the invention greatly reduces the overhead of the measurement pilot frequency, and particularly effectively improves the resource utilization rate of data transmission along with the increase of the antenna scale.

Example eight

The embodiment of the invention provides a channel state information measuring method, along with the increase of the scale of antennas, the increase of the number of antennas and the correlation among all antennas in an array can be divided into the correlations of a plurality of antenna groups for representation, namely, the correlation among all antenna groups forms the correlation among the antennas of the whole antenna array. The whole antenna array is divided into equal 4 antenna groups (groups) 1 to 4 as shown in fig. 9.

In the prior art, CSI measurements of all antenna ports of an array are used to obtain corresponding PMI information. Thus, the required overhead of the measurement reference signal will be huge when the antenna scale is large.

As the antenna scale increases, the correlation between the antennas becomes further large. As shown in fig. 10, the precoding matrix indicator of the group Wx composed of the first two

antenna groups

1 and 2 and the precoding matrix indicator of the group Wy composed of the second two

antenna groups

3 and 4 are Co-phased (Co-phasing) W.

The correlation between each antenna group is utilized to make correlation domain difference, namely after the first antenna group measures to obtain the precoding indicator PMI, the adjacent second antenna group only needs to measure to obtain the phase difference information between the adjacent second antenna group and the first antenna group, and the phase difference information is obtained only by measurement and the precoding matrix indicator PMI which is the same as that of the first antenna group does not need to be measured, so that the required overhead of measuring pilot frequency can be greatly reduced. Specifically, the method comprises the following steps:

as shown in fig. 11 (it is assumed here that the phase difference information is reflected in W₁In (1), it is to be understood that the phase difference information determined by a predetermined method or a higher layer configuration method in the base station or the user equipment is reflected in the first precoding matrix or reflected in the second precoding matrix. The PMI of the second group2 differs from the PMI of the first group1 by one phase Offset, and the PMI of the third group3 differs from the PMI of the second group2 by one phase Offset. And the phase Offset between PMIs of each group can be reflected in W₁In (1).

The scheme provided by the embodiment of the invention groups all the reference signal antenna ports in the array, and different groups of measurement reference signal ports finish different pre-coding matrix indicator measurements.

For example, the reference signal ports measured in the first group1 are used to obtain the precoding matrix indicator corresponding to the antenna port included in the first group 1.

And the second group1 measurement reference signal port is used for measuring and obtaining the phase difference between the precoding indicator corresponding to the antenna port included in the second group2 and the precoding indicator corresponding to the antenna port included in the first group 1.

The third group3 is used to measure the phase difference between the precoding indicator corresponding to the antenna port included in the third group3 and the precoding indicator corresponding to the antenna port included in the second group2, and so on.

Wherein, the first Group1 measurement reference signal ports may be all antenna ports in Group1 in fig. 11, and the second Group2 reference signal ports may be composed of the ith antenna port in Group1 in fig. 11 and the ith antenna port in Group2, where i is 1, …, N_group1N of the group_group1Is the number of antenna ports in Group 1. The third Group of 3 reference signal ports may be composed of the ith antenna port in Group2 and the ith antenna port in Group3, where i is 1, …, N_group2N of the group_group3Is the number of antenna ports in Group 3.

Assuming that the entire antenna array is divided into M groups, the first precoding matrix of the entire antenna array is a block diagonal array consisting of N blocks. The precoding matrix measured by the first group1 of reference signal ports is the first precoding matrix W of the whole antenna array ₁1 st block, noted

The phase difference information of the other groups than the first group1 with respect to the first group1 is respectively

Therefore, the precoding matrixes of other groups respectively correspond to the first precoding matrix W of the whole antenna array₁Is 2, …, M, noted as

The precoding matrix structure of the whole antenna array obtained by the measurement of the measurement reference signal can be represented as follows:

example nine

The embodiment of the invention provides a channel state information measuring method, along with the increase of the antenna scale, the increase of the number of antennas and the representation of the correlation among all antennas in an array can be divided into the correlation among a plurality of antenna groups, namely, the correlation among all antenna groups forms the correlation among the antennas of the whole antenna array. The entire antenna array is divided into equal groups of 4 antennas as shown in figure 9 above.

In the prior art, the CSI measurement of all antenna ports of the array is used to obtain corresponding PMI information, and the overhead of measurement reference signals required when the antenna size is large is enormous.

As the antenna scale increases, the correlation between the antennas becomes further large. The precoding matrix indicators of the first two

antenna groups

1 and 2 and the precoding matrix indicators of the last two

antenna groups

3 and 4 are co-phased, as can be seen in fig. 10 above.

The correlation between the antenna groups is used for making correlation domain difference, namely, the correlation between the precoding matrixes corresponding to the antenna port groups is used for carrying out difference, so that the correlation domain difference can be understood as that after the first antenna port group measures and obtains the information of the corresponding precoding indicator PMI, the adjacent second antenna port group measures and obtains the phase difference information between the adjacent second antenna port group and the first antenna port group, and the phase difference information is obtained only by measurement and does not need to be measured and obtained to obtain the information of the precoding matrix indicator PMI which is the same as that of the first antenna port group, so that the overhead of required pilot frequency measurement can be greatly reduced. In particular, the amount of the solvent to be used,

as shown in fig. 12 (it is assumed here that the phase difference information is reflected in W₂In (b), the PMIs of the second group of antenna ports differ from the PMIs of the first group of antenna ports by one phase Offset, and the PMIs of the third group of antenna ports differ from the PMIs of the second group of antenna ports by one phase Offset. And the phase Offset between PMIs of each group of antenna ports can be set from W₂To reflect it.

The scheme provided by the embodiment of the present invention groups all antenna ports in the array, and different groups of reference signal ports complete different precoding matrix indicator measurements, and the specific measurement is similar to the measurement in the eighth embodiment, which is not described herein again.

Assuming that the entire antenna array is divided into M groups, the second precoding matrix of the entire antenna array is a column vector consisting of N matrix blocks. The precoding matrix measured by the first group1 of reference signal ports is a second precoding matrix W of the whole antenna array₂First row element of (1), noted as Y₁The phase difference information of the other groups than the first group1 with respect to the first group1 is respectively

Therefore, the precoding matrixes of other groups respectively correspond to the second precoding matrixes W of the whole antenna array₂Is recorded as (i) 2, …, M)

The whole antenna array obtained by measuring the reference signal portThe precoding matrix structure of (a) can be represented as follows:

summarizing the solutions provided by the sixth and seventh embodiments, CSI measurement is performed according to the configured N measurement reference signal ports, the precoding matrix indicator in the measured CSI information is composed of the following M parts,

the M parts comprise a first precoding matrix W₁First phase information, second phase information up to the M-1 th phase information. The first precoding matrix may be a long-term wideband precoding matrix indicator, or a short-term/subband precoding matrix indicator;

the final precoding matrix may be:

or:

example ten

An embodiment of the present invention provides a device for measuring channel state information, that is, a receiving apparatus described in the sixth embodiment, as shown in fig. 13, where the device includes: a transceiver 131 and a processor 132 respectively connected to the bus;

the transceiver 131 is configured to receive reference signal configuration information sent by a sending device and reference signals of N configured reference signal ports; wherein, the value of N may be less than or equal to the total number of antenna ports.

The processor 132 is configured to perform CSI measurement on reference signals of the configured N reference signal ports received by the transceiver 131; wherein the N reference signal ports are composed of M groups of reference signal ports, and M > -1.

When the processor 132 performs CSI measurement based on the reference signals of the configured N reference signal ports, specifically: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain a weighted value corresponding to each group of reference signal ports, and obtaining a first precoding matrix and/or a second precoding matrix according to the weighted value, so that the weighted value corresponds to a certain component in the first precoding matrix and/or the second precoding matrix; obtaining a third pre-coding matrix according to the first pre-coding matrix and/or the second pre-coding matrix; and obtaining a Channel Quality Indicator (CQI) according to the third precoding matrix. The process of the processor 132 specifically obtaining the third precoding matrix may be as described in the sixth embodiment, which is not described herein again.

In the first pre-coding matrix, the difference between weighted values corresponding to any two groups of reference signal ports is a phase item; and/or, in the second precoding matrix, the weighted values corresponding to any two groups of reference signal ports differ by a phase item, where the phase item may be

In the form of (1), wherein

Can be [0,2 pi ]]An angle between the first precoding matrix and the second precoding matrix may be obtained by performing a certain operation on the first precoding matrix and the second precoding matrix when the processor 132 obtains the third precoding matrix, and the obtained third precoding matrix may be as described in the sixth embodiment, which is not described herein again.

Further, in other specific embodiments, the transceiver 131 may be further configured to feed back a precoding matrix indicator PMI and a channel quality indication CQI corresponding to the third precoding matrix to the transmitting device, so that the transmitting device performs precoding operation according to the PMI and the CQI.

The channel state information measuring device provided in the embodiment of the present invention is designed by using the correlation between CSI measurement reference signal ports, so that the number of ports configured by the sending device is smaller than the number of ports when the sending device actually transmits data, and the processor 132 of the device in this example only needs to measure the channel state information for the reference signals of the M (which is much smaller than the number of ports that actually transmit data) groups of ports.

EXAMPLE eleven

An embodiment of the present invention provides an apparatus for sending a reference signal, that is, the sending device in the seventh embodiment, as shown in fig. 14, the apparatus includes: a transceiver 141 and a processor 142 connected to the bus,

the processor 142 is configured to configure reference signals of N reference signal ports, where N > is 6, the N reference signal ports are formed by M groups of reference signal ports, and M > is 1;

the transceiver 141 is configured to send reference signal configuration information of the N reference signal ports configured by the processor 142, and send a reference signal according to the configured N reference signal ports and the reference signal configuration information, where the reference signal is used for a receiving device to perform CSI measurement on the basis of the configured reference signals of the N reference signal ports, so as to obtain a third precoding matrix determined according to the first precoding matrix and/or the second precoding matrix, and obtain a channel quality indicator CQI according to the third precoding matrix. The third precoding matrix may be as shown in the seventh embodiment, which is not described herein.

Wherein the receiving device performs CSI measurement based on the configured reference signals of the N reference signal ports, and includes: and respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain a weighted value corresponding to each group of reference signal ports, and obtaining the first precoding matrix and/or the second precoding matrix according to the weighted value, so that the weighted value is a certain component in the first precoding matrix and/or the second precoding matrix. The process of the receiving device specifically obtaining the third precoding matrix may be as described in the sixth embodiment, which is not described herein again.

In the first precoding matrix, the difference between weighted values corresponding to any two groups of reference signal ports is a phase item; and/or in the second pre-coding matrix, the weighted values corresponding to any two groups of reference signal ports have a phase difference; the obtained third precoding matrix may be obtained by performing a certain operation on the first precoding matrix and the second precoding matrix, which is specifically shown in the sixth embodiment, and is not described herein again. Where the phase term may be

In the form of (1), wherein

Can be [0,2 pi ]]An angle therebetween.

Further, the transceiver 141 of this embodiment is further configured to receive an indicator PMI and a channel quality indicator CQI corresponding to a third precoding matrix fed back by the receiving device; processor 142 is also configured to perform precoding operations based on the PMI and CQI received by transceiver 141.

The transmitting device of the reference signal provided by the embodiment of the present invention is designed by using the correlation of the CSI measurement pilot, and specifically, the processor 142 may configure M groups of ports, and the receiving device only needs to measure the channel state information of the reference signals of the M groups of ports, and the number of ports of the M groups of reference signals is smaller than the number of ports when data is actually transmitted, so as to greatly reduce the overhead of the measurement pilot compared with the prior art where the receiving device needs to perform CSI measurement on the reference signals of all ports when the transmitting device actually transmits data, and particularly, effectively improve the resource utilization rate of data transmission along with the increase of the antenna scale.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

The method and apparatus for transmitting channel state information measurement and reference signal provided by the embodiments of the present invention are described in detail above, and a specific example is applied in the text to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A method for measuring channel state information, the method comprising:

the reference signal configuration information includes at least one of: the number of reference signal ports, the time-frequency resource information occupied by each reference signal port, and the grouping information of the M groups of reference signal ports.

2. The method of claim 1, wherein the method further comprises:

3. The method according to claim 1 or 2,

4. The method according to claim 1 or 2,

5. A method for transmitting a reference signal, the method comprising:

sending reference signal configuration information of the N reference signal ports, the reference signal configuration information including at least one of: the number of reference signal ports, time-frequency resource information occupied by each reference signal port and grouping information of the M groups of reference signal ports;

wherein, the reference signals of the configured N reference signal ports are used for the receiving device to perform channel state information, CSI, measurement on the reference signals of the configured N reference signal ports, and the method includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first pre-programmed signalsCode matrices, i.e. W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

6. The method of claim 5, wherein the method further comprises:

7. The method according to claim 5 or 6,

8. The method according to claim 5 or 6,

9. An apparatus for measuring channel state information, the apparatus comprising: a transceiver and a processor respectively connected to the bus;

wherein the performing of CSI measurement based on the configured reference signals of the N reference signal ports includes: are respectively provided withPerforming CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

10. The apparatus of claim 9,

11. The apparatus according to claim 9 or 10, wherein the transceiver is further configured to receive the reference signals of the N configured reference signal ports transmitted by the transmitting device in the same subframe.

12. The apparatus of claim 9 or 10, wherein the number of reference signal ports of each of the M groups of reference signal ports is a prime number of the total number of antenna ports.

13. An apparatus for transmitting a reference signal, the apparatus comprising: a processor and a transceiver respectively connected to the bus,

the transceiver is used for sending the reference signal configuration of the N reference signal ports configured by the processorInformation, according to the configured N reference signal ports and the reference signal configuration information, sending the reference signals of the configured N reference signal ports; the method for measuring the CSI of the reference signals of the N configured reference signal ports by the receiving equipment includes: respectively carrying out CSI measurement on the reference signals of each group of ports in the M groups of reference signal ports to obtain M first precoding matrixes, namely W_iWherein i ═ 1,2, …, M; obtaining a second precoding matrix W according to the first precoding matrix:

obtaining a Channel Quality Indicator (CQI) according to the second precoding matrix; the reference signal configuration information includes at least one of: the number of reference signal ports, the time-frequency resource information occupied by each reference signal port, and the grouping information of the M groups of reference signal ports.

14. The apparatus of claim 13,

15. The apparatus according to claim 13 or 14, wherein the transceiver is specifically configured to transmit the reference signals of the configured N reference signal ports on the same subframe.

16. The apparatus of claim 13 or 14,