CN105634680A

CN105634680A - Channel state information feedback and obtaining method and device

Info

Publication number: CN105634680A
Application number: CN201410602804.9A
Authority: CN
Inventors: 陈润华; 高秋彬; 拉盖施; 李辉
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-06-01
Anticipated expiration: 2034-10-31
Also published as: CN105634680B; WO2016066036A1

Abstract

The invention discloses a channel state information feedback and obtaining method and device, and the method and device are used for reducing the feedback cost of UE, reducing the processing difficulty of CSI feedback at a UE side, enabling the feedback and obtaining of the channel state information to be more convenient, and saving the resources. Meanwhile, the obtained channel state information can reflect the overall channel state information after 3D-MIMO forming. The method comprises the steps: transmitting a first pilot frequency signal to the UE through a first pilot frequency resource which is preset for the UE; receiving a CSI which is fed back by the UE through a first process preset for the UE and a CSI which is fed back by the UE through a second process preset for the UE, wherein the CSIs are obtained by the UE through measurement and calculation based on the first pilot frequency signal.

Description

Method and device for feeding back and acquiring channel state information

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for feeding back and acquiring 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, so that various beam forming and 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.

An important characteristic of 3-dimensional (3D) Multiple Input Multiple Output (MIMO) is that the number of antennas on the base station side is very large, and the antenna structure is two-dimensional, for example: 8. 16, 32, 64 antennas, etc.

With the development of antenna technology, active antennas capable of independent control of each array have emerged in the industry. By adopting the design, the antenna array can be enhanced from the current two-dimensional horizontal arrangement to the three-dimensional horizontal arrangement and the vertical arrangement, and the mode of the antenna array enables the dynamic adjustment of the beam in the vertical direction to be possible.

In Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems, three-dimensional beamforming and precoding need to be implemented by Channel State Information (CSI) reported by a terminal, and at present, the following two ways are implemented.

The first method is to continue to use a reporting method based on a codebook, for example: a Long Term Evolution (LTE) release 8(Rel-8) system.

For example: there is a 3D-MIMO antenna array with a size of 4 × 4, where an evolved node b (eNB) configures a channel state information reference signal (also referred to as sounding reference signal) (CSI-RS) resource, the antenna array has 16 antenna ports, and the UE feeds back a CSI process corresponding to the total number of antennas. However, the feedback codebook must correspond to the total number of antennas, that is, 16 antennas, so that the codebook must include many codewords to be able to satisfy sufficient accuracy, designing a new codebook corresponding to a new number of antennas (16 antennas) is also a complicated standardization work, and in this way, the UE needs to select the best codeword among the codewords that can reflect the channel, and the calculation and feedback overhead of the feedback is also large. In addition, this method has the following problems:

the antenna unit for three-dimensional beam forming adopts an active antenna independently controlled by each array, an antenna power amplifier is integrated with the antenna unit, and the transmitting power of each antenna unit is very low under the condition that the number of the antenna units is very large. In view of the above situation, the prior art proposes that the problem may be solved by adopting an antenna virtualization or sectorization method, but after the antenna virtualization, the terminal may not be able to distinguish multiple antenna elements, and thus, effective multi-antenna transmission cannot be achieved by using multiple antenna elements.

And secondly, the number of antenna ports is too large, each antenna unit sends a CSI-RS (channel state information-reference signal), so that the terminal needs to perform channel estimation on each antenna port and perform CSI calculation based on the channel estimation value, and the complexity of the terminal is high when the number of the antenna units is large, and the realization is difficult.

And in the second mode, the eNB configures two CSI-RS resources, and the port number of each resource corresponds to the number of antennas in the vertical dimension and the horizontal dimension.

For example: there is a 3D-MIMO antenna array of size 4x4, and the eNB configures two CSI-RS resources, each resource having 4 ports, corresponding to the two CSI-RS resources, and each CSI-RS resource can be used to feed back a channel state of a different dimension, such as horizontal dimension and vertical dimension, so that the UE feeds back two CSI processes, each corresponding to a resource. Each CSI-RS resource is sent from a set of antennas, the UE measures each CSI-RS resource and feeds back the CSI corresponding to the CSI-RS resource, which is called a CSI process, each CSI process in the existing standard is defined as being associated to one CSI-RS resource, the CSI feedback content in each CSI process is independently measured from the CSI-RS resource corresponding to the CSI-RS process and includes Rank Indication (RI), Precoding Matrix Indication (PMI) and Channel Quality Indication (CQI), the RI reflects the number of code streams that the UE can support in downlink, the PMI reflects the coding matrix in a codebook fed back by the UE, and the CQI reflects the signal strength that the UE can receive after the RI/PMI is applied to MIMO coding. The CQI calculation must be based on the fed back RI/PMI, which may be some indication of the signal strength, for example: signal to interference plus noise ratio (SINR), or Modulation and Coding Scheme (MCS), or other characteristics. The number of CQI feedbacks is adjusted according to the RI, for example: RI is 1, and if UE can accept a code stream, there is a CQI feedback; RI >1, which means that the UE can accept multiple code streams, there are multiple CQI feedbacks, and in the existing LTE standard, when RI >1, there are two CQI feedbacks. And the eNB obtains downlink 3D-MIMO shaped information according to the CSI of the vertical dimension and the horizontal dimension fed back by the UE, and obtains a CQI value for downlink adjustment. However, this method has the following problems:

each CSI process is independently calculated, and cannot reflect the whole channel state information after 3D-MIMO forming, for example: the CSI process of the vertical dimension is obtained by measuring the CSI-RS resource of the vertical dimension, the CSI process of the horizontal dimension is obtained by measuring the CSI-RS resource of the horizontal dimension, no incidence relation exists between the two CSI processes, the eNB cannot be directly applied to shaping of 3D-MIMO after receiving the CSI processes of the vertical dimension and the horizontal dimension, the two CSI processes must be further processed to obtain shaping information and CQI information on a two-dimensional matrix of the 3D-MIMO, the complexity of the eNB is increased, and the accuracy of shaping of the 3D-MIMO is reduced.

In summary, in the existing technical scheme for acquiring the CSI in the 3D-MIMO technology, based on the conventional feedback scheme, one CSI-RS resource is measured, and a CSI process is reported through one codebook, so that the calculation difficulty and the feedback overhead of the UE are large, which is not favorable for implementation.

Disclosure of Invention

The embodiment of the invention provides a method and a device for feeding back and acquiring channel state information, which are used for reducing the feedback overhead of UE (user equipment), reducing the difficulty in CSI feedback processing on the UE side, enabling the channel state information to be fed back and acquired more conveniently, saving resources and enabling the acquired channel state information to reflect the whole channel state information after 3D-MIMO (three-dimensional multiple input multiple output) forming.

The method for acquiring the channel state information CSI provided by the embodiment of the invention comprises the following steps: sending a first pilot signal to User Equipment (UE) through a first pilot resource configured for the UE in advance; and receiving CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back through a second process configured for the UE in advance, wherein the CSI fed back through the first process and the CSI fed back through the second process are obtained by the UE through measurement and calculation at least based on the first pilot signal.

In the above method provided by the embodiment of the present invention, a network side (e.g., a base station) receives CSI fed back by a UE through a first process and a second process, and the CSI is obtained by the UE through measurement and calculation based on at least a first pilot signal, the CSI fed back through the first process and the CSI fed back through the second process are obtained through measurement and calculation based on at least the first pilot signal, and channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the CSI fed back by the first process is N1, the number of antenna ports corresponding to the CSI fed back by the second process is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the CSI fed back by the first process includes: precoding Matrix Indication (PMI) information; the CSI fed back by the second process comprises: PMI information and Channel Quality Indication (CQI) information, wherein the CQI information is obtained by the UE based on the PMI information fed back by the first process and the PMI information fed back by the second process.

In the method provided by the embodiment of the present invention, the CSI fed back by the first process only includes PMI information, and CQI feedback is not performed, so that feedback overhead of the UE is reduced.

In a possible implementation manner, the method provided by an embodiment of the present invention further includes: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In the above method provided by the embodiment of the present invention, the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal, and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal, so that the CSI fed back by the first process and the CSI fed back by the second process have a certain correlation, and the channel state information of the antenna array can be reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO shaping, so that the base station can be directly applied to the 3D-MIMO shaping after receiving the CSI fed back by the UE, compared with the prior art that the CSI is measured and calculated by the UE on a single resource, the CSI fed back through the first process and the CSI fed back through the second process reflect the whole channel state information after the 3D-MIMO shaping together, the base station does not need to further process the received CSI, and the processing difficulty of the base station is reduced.

In a possible implementation manner, the method provided by an embodiment of the present invention further includes: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In the above method provided by the embodiment of the present invention, the CSI fed back by the first process is obtained by the UE through common measurement and calculation based on the first pilot signal and the second pilot signal, and the CSI fed back by the second process is also obtained by the UE through common measurement and calculation based on the first pilot signal and the second pilot signal, so that the CSI fed back by the first process and the CSI fed back by the second process have a certain correlation, and channel state information of the antenna array can be reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO shaping, so that the base station can be directly applied to the 3D-MIMO shaping after receiving the CSI fed back by the UE, compared with the prior art that the CSI is measured and calculated by the UE on a single resource, the CSI fed back through the first process and the CSI fed back through the second process reflect the whole channel state information after the 3D-MIMO shaping together, the base station does not need to further process the received CSI, and the processing difficulty of the base station is reduced.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the CSI fed back by the first process includes: PMI information.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the feeding back CSI by the first process further includes: and Rank Indication (RI) information corresponding to the PMI information.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the CSI fed back by the second process includes: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the second process and the PMI information fed back by the first process.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the first process, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to the CSI fed back by the second process.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, a configuration period of the first pilot resource is L times of a configuration period of the second pilot resource, where L is a positive integer greater than or equal to 1.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, a feedback period of the CSI fed back by the first process is L times a feedback period of the CSI fed back by the second process, where L is a positive integer greater than or equal to 1.

In a possible implementation manner, in the method provided in an embodiment of the present invention, the first pilot resource and the second pilot resource are channel state information reference signal CSI-RS resources or common reference signal CRS resources.

The feedback method for the CSI provided by the embodiment of the invention comprises the following steps: user Equipment (UE) determines a first pilot frequency resource, a first process and a second process which are configured for the UE in advance by a network side; the UE obtains first CSI and second CSI at least based on measurement calculation of a first pilot signal sent by a network side through the first pilot resource; and the UE feeds the first CSI back to the network side through the first process and feeds the second CSI back to the network side through the second process.

In the above method provided by the embodiment of the present invention, the UE obtains the second CSI and the second CSI at least based on the first pilot signal measurement calculation, the first CSI and the second CSI are obtained at least based on the first pilot signal measurement calculation, and the channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the foregoing method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the first CSI is N1, the number of antenna ports corresponding to the second CSI is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the first CSI includes: precoding Matrix Indication (PMI) information; the second CSI includes: PMI information and Channel Quality Indication (CQI) information, wherein the CQI information is obtained by the UE based on the PMI information in the first CSI and the PMI information in the second CSI.

In a possible implementation manner, the method provided by an embodiment of the present invention further includes: the UE determines a second pilot frequency resource configured for the UE in advance by a network side; the UE obtains the first CSI and the second CSI by measuring and calculating at least based on a first pilot signal sent by the network side through the first pilot resource, specifically: the UE calculates and obtains first CSI based on the first pilot signal measurement; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, the method provided by an embodiment of the present invention further includes: the UE determines a second pilot frequency resource configured for the UE in advance by a network side; the UE obtains the first CSI and the second CSI by measuring and calculating at least based on a first pilot signal sent by the network side through the first pilot resource, specifically: the UE obtains first CSI through common measurement calculation based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the first CSI includes: PMI information.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the first CSI further includes: and Rank Indication (RI) information corresponding to the PMI information.

In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the second CSI includes: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information in the second CSI and the PMI information in the first CSI.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to the second CSI.

The device for acquiring the channel state information CSI provided by the embodiment of the invention comprises: a first unit, configured to send a first pilot signal to a user equipment UE through a first pilot resource configured for the UE in advance; and a second unit, connected to the first unit, configured to receive CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back by a second process configured for the UE in advance, where the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement.

In the above apparatus provided in this embodiment of the present invention, the apparatus (e.g., a base station) receives CSI fed back by the UE through the first process and the second process, and the CSI is calculated by the UE based on at least measurement of the first pilot signal, and the CSI fed back by the first process and the CSI fed back by the second process are calculated based on at least measurement of the first pilot signal, and reflects channel state information of the first pilot signal from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the above apparatus provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to CSI fed back by the first process is N1, the number of antenna ports corresponding to CSI fed back by the second process is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, an embodiment of the present invention provides the above apparatus, wherein the first unit is further configured to: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In a possible implementation manner, an embodiment of the present invention provides the above apparatus, wherein the first unit is further configured to: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the first process, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the second process.

The feedback device for the Channel State Information (CSI) provided by the embodiment of the invention comprises: a resource determining unit, configured to determine a first pilot resource, a first process, and a second process that are configured in advance by a network side for a user equipment UE where the apparatus is located; the measurement unit is connected to the resource determination unit and used for measuring and calculating to obtain first CSI and second CSI at least based on a first pilot signal sent by the network side through the first pilot resource; and the feedback unit is connected to the resource determination unit and the measurement unit, and is configured to feed back the first CSI to the network side through the first process and feed back the second CSI to the network side through the second process.

In the above apparatus provided in the embodiment of the present invention, the UE where the apparatus is located obtains the second CSI and the second CSI by measurement and calculation based on at least the first pilot signal, the first CSI and the second CSI are obtained by measurement and calculation based on at least the first pilot signal, and channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the above apparatus provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the first CSI is N1, the number of antenna ports corresponding to the second CSI is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in the foregoing apparatus provided by an embodiment of the present invention, the resource determining unit is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side; the measurement unit is specifically configured to: calculating to obtain first CSI based on the first pilot signal measurement; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, in the foregoing apparatus provided by an embodiment of the present invention, the resource determining unit is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side; the measurement unit is specifically configured to: obtaining first CSI (channel state information) by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to the second CSI.

Drawings

Fig. 1 is a schematic flowchart of a method for acquiring CSI at a network side according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a method for calculating CSI at the UE side according to an embodiment of the present invention;

fig. 3 is a schematic diagram of another CSI calculation method on the UE side according to an embodiment of the present invention;

fig. 4 is a schematic diagram of another CSI calculation method on the UE side according to an embodiment of the present invention;

fig. 5A to 5C are schematic diagrams illustrating a feedback manner for feeding back CSI by the first process according to an embodiment of the present invention;

fig. 6 is a schematic flowchart of a CSI feedback method on a UE side according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an apparatus for acquiring CSI at a network side according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another CSI obtaining apparatus on the network side according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a CSI feedback apparatus on a UE side according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of another CSI feedback apparatus on the UE side according to an embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a method and a device for feeding back and acquiring channel state information, which are used for reducing the feedback overhead of UE (user equipment), reducing the difficulty in CSI feedback processing on the UE side, enabling the feedback and acquisition of the channel state information to be more convenient and faster, saving resources, and meanwhile, the acquired channel state information can reflect the whole channel state information after 3D-MIMO (three-dimensional multiple input multiple output) shaping, and reducing the processing difficulty of a base station.

Since the wireless signal is propagated three-dimensionally in space, the method of fixing the downtilt angle does not optimize the performance of the system. The beam adjustment in the vertical direction has important significance for reducing the inter-cell interference and improving the system performance.

The first process and the second process described in the embodiment of the present invention may be two processes, or may be two sub-processes of the same process, in the embodiment of the present invention, two processes are described, and the first process and the second process are only names defined for distinguishing the two processes; the first pilot frequency resource and the second pilot frequency resource in the embodiment of the present invention may be two independently configured resources, or two sub-resources of the same resource, in the embodiment of the present invention, two independently configured resources are used for description, and the first pilot frequency resource and the second pilot frequency resource are only names defined for distinguishing the two resources; the first pilot resource and the second pilot resource may be channel state information reference signal (CSI-RS) resources or Common Reference Signal (CRS) resources, and the like.

The embodiment of the invention provides that the eNB can allocate the CSI-RS resource to the UE for measurement. In a conventional wireless system such as LTE, the pilot signal may be used for channel information measurement or Radio Resource Management (RRM) measurement, including Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and the like. The measurement may be performed on a Common Reference Signal (CRS) or CSI-RS, but may also be performed on the basis of measurement on other pilot signals, which is not described herein.

On a network side, taking a base station as an example, an obtaining method of channel state information CSI provided in an embodiment of the present invention, as shown in fig. 1, includes:

step 102, sending a first pilot signal to User Equipment (UE) through a first pilot resource configured for the UE in advance;

the first pilot resource specifically refers to a time domain and a frequency domain resource used for transmitting the first pilot signal, and may notify resource configuration information of the first pilot resource to the UE through higher layer information, where the higher layer information includes a transmission period, an offset (offset), power, an index (index) of the first pilot signal, and the like of the first pilot signal. One subframe in LTE may have multiple CSI-RS resources to choose from, for example, 20 CSI-RS resources in one subframe in a 2-antenna system may be chosen, and the index of the CSI-RS is used to inform the UE which index corresponds to the CSI-RS resource configured for the UE.

Each CSI-RS resource has a respective independent subframe (subframe) period and displacement. If the transmission period of the CSI-RS is 5 subframes, the offset indicates from which subframe in each frame the CSI-RS starts to be transmitted, and may be 0, 1, 2, 3 or 4, for example, when the value is 0, the CSI-RS starts to be transmitted from subframe 0 in each frame, and when the value is 1, the CSI-RS starts to be transmitted from subframe 1 in each frame.

And 104, receiving CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back through a second process configured for the UE in advance, wherein the CSI fed back through the first process and the CSI fed back through the second process are obtained by measuring and calculating the CSI at least based on the first pilot signal by the UE.

In the method provided by the embodiment of the present invention, the CSI that the base station receives the UE fed back through the first process and the second process is obtained by the UE through measurement and calculation based on at least the first pilot signal, the CSI fed back through the first process and the CSI fed back through the second process are obtained through measurement and calculation based on at least the first pilot signal, and channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

Of course, it should be noted that the base station configures the first process and the second process for feeding back the CSI for the UE in advance, for example: the feedback period, the displacement and the accuracy of the CSI are configured, so that the base station can conveniently control the CSI fed back by the UE, the base station can conveniently adjust the parameters of the antenna, and the performance is improved.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the CSI fed back by the first process is N1, the number of antenna ports corresponding to the CSI fed back by the second process is N2, and a product of N1 and N2 is equal to N.

As a more specific example, as shown in fig. 2, for example: a 4 × 4 antenna array, where a base station configures a first pilot resource 202 with a 16-port for a UE, and sends a first pilot signal to the UE through the first pilot resource 202, where the first pilot resource includes a sending period, a displacement, a power, an index of the first pilot signal, and the like of the first pilot signal; the UE performs measurement and calculation based on the first pilot signal to obtain CSI of a first dimension (for example, a horizontal dimension) and CSI of a second dimension (for example, a vertical dimension), and feeds the CSI of the first dimension back to the base station through the first process 204, and feeds the CSI of the second dimension back to the base station through the second process 206, because the CSI of the first dimension and the CSI of the second dimension are obtained by the UE measuring two dimensions of the first pilot signal, the number of antenna ports corresponding to the CSI of the first dimension and the CSI of the second dimension is not the total number of antenna ports of the antenna array, but is only the number of antenna ports of one dimension, that is, the number of antenna ports corresponding to the CSI of the first dimension (CSI fed back through the first process) is 4, and the number of antenna ports corresponding to the CSI of the second dimension (CSI fed back through the second process) is also 4.

Specifically, assuming that PMI information in CSI fed back by the first process 204 is denoted as PMI1 and PMI information in CSI fed back by the second process 206 is denoted as PMI2, PMI1 and PMI2 may be calculated by the following formulas:

(PMI1，PMI2)＝argopt_{V1∈codebook1，V2∈codebook2}f(H×)

wherein the arg function is a value set which enables PMI1 and PMI2 to be optimal; the opt function represents optimization calculation for selecting the best optimization in all selectable optimization spaces; h is a total channel estimation value obtained by the UE through measurement of the first pilot frequency resource, reflects a channel from the three-dimensional antenna array to the UE, is an NrxK matrix, Nr is the number of receiving antennas of the UE, and K is the total number of antennas (for example, 16); the value of the V1 is traversed in the first-dimension precoding beamforming matrix codebook1 (i.e., codebook1), the value of the V2 is traversed in the second-dimension precoding beamforming matrix codebook2 (i.e., codebook2), the V1 and the V2 respectively correspond to a 4-antenna codebook, so as to find a value set which makes the PMI1 and the PMI2 optimal, and the PMI1 and the PMI2 are precoding matrix indication information of an antenna array fed back by the UE.Representing the Kronecker product, it is noted that in the above formulaA 16-antenna beamforming matrix representing the total of one 3D-MIMO is generated by a two-dimensional 4-antenna beamforming matrix. The Kronecker product is just one possible scheme, and in another embodiment, other schemes may be used to generate the overall beamforming matrix by using the vertical dimension beamforming matrix and the horizontal dimension beamforming matrix, which is not limited herein.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the CSI fed back by the first process includes: precoding Matrix Indication (PMI) information; the CSI fed back by the second process comprises: the method comprises the steps of PMI information and channel quality indication CQI information, wherein the CQI information is obtained by the UE based on the PMI information fed back by the first process and the PMI information fed back by the second process.

As a more specific embodiment, assuming that a UE using a Minimum Mean Square Error (MMSE) receiver obtains an optimal PMI1 (corresponding to a forming matrix V1) and PMI2 (corresponding to a forming matrix V2) after UE measurement calculation, the calculation of the r-th code stream CQI is as follows:

CQI = \frac{1}{{({(I + {\overset{\cdot \cdot}{H} R}^{- 1} {\overset{\cdot \cdot}{H}}^{'})}^{- 1})}_{r, r}} - 1

wherein,is the actual channel after the 3D-MIMO observed by the UE is shaped by using V1 and V2 matrixes_r,rIs the value of the variable on the diagonal of the R-th of a matrix, I is a diagonal matrix (identify) where each variable on the diagonal is 1, the variables on the other off-diagonals are 0, R is the skew square difference matrix (covariancematrix) of the noise/interference measured by the UE, is a matrix of NrxNr, and Nr is the number of UE receive antennas.

In the method provided by the embodiment of the invention, the CSI fed back by the first process only contains PMI information, and CQI feedback is not carried out, so that the feedback overhead of the UE is reduced.

Specifically, the CSI of the first dimension obtained by the UE through measurement and calculation of the first pilot signal includes: PMI1, the CSI of the second dimension includes: PMI2, further, the UE may calculate a CQI value after beamforming 3D-MIMO by using PMI1 and PMI2, and feed back the CQI value through the first process or the second process, as a more preferred embodiment, the CQI value is fed back through CSI fed back by the second process.

In the above, the base station configures one pilot resource for the UE, and the base station performs feedback of two-dimensional CSI based on the pilot resource, and in specific implementation, the base station may also configure two pilot resources for the UE, and the following describes a case where the base station configures two pilot resources for the UE with reference to a specific embodiment.

Example one

In a possible implementation manner, the method provided in an embodiment of the present invention further includes: sending a second pilot signal to the UE through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In this embodiment, the CSI fed back by the first process is calculated by the UE based on measurement of the first pilot signal, and the CSI fed back by the second process is calculated by the UE based on measurement of the first pilot signal and the second pilot signal, so that the CSI fed back by the first process and the CSI fed back by the second process have a certain correlation, and the channel state information of the antenna array can be reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO shaping, so that the base station can be directly applied to the 3D-MIMO shaping after receiving the CSI fed back by the UE, compared with the prior art that the CSI is measured and calculated by the UE on a single resource, the CSI fed back through the first process and the CSI fed back through the second process reflect the whole channel state information after the 3D-MIMO shaping together, the base station does not need to further process the received CSI, and the processing difficulty of the base station is reduced.

As a more specific embodiment, as shown in fig. 3, a base station configures a first pilot resource 302 and a second pilot resource 304, a first process 306, and a second process 308 for a UE, CSI fed back by the first process 306 is obtained by measurement and calculation based on a first pilot signal in the first pilot resource 302, and assuming that PMI information in CSI fed back by the first process 306 is denoted as PMI1, PMI1 may be calculated by the following formula:

PMI1＝argopt_{V1∈codebook1}f(H1×V1)

h1 is a channel estimation value obtained by measuring the first pilot resource by the UE, V1 traverses the value in the first-dimension precoding beamforming matrix codebook1 (i.e., codebook1) to find the value that makes PMI1 optimal, and V1 corresponds to a 4-antenna codebook.

The CSI fed back by the second process 308 is calculated based on the joint measurement of the first pilot signal in the first pilot resource 302 and the second pilot signal in the second pilot resource 304, and assuming that the PMI information in the CSI fed back by the second process 308 is denoted as PMI2, the calculation of the PMI2 is based on PMI1 to optimize the performance of 3D-MIMO, which can be specifically calculated by the following formula:

PMI2＝argopt_{V2∈codebook2}f(g×)

h1 and H2 are channel estimation values obtained by the UE by measuring the first pilot resource 302 and the second pilot resource 304, respectively, V1 traverses in the first-dimension precoding beamforming matrix codebook1 (i.e., codebook1), V2 traverses in the second-dimension precoding beamforming matrix codebook2 (i.e., codebook2) to find a value that makes PMI2 optimal, V1 and V2 each correspond to a 4-antenna codebook, that is, the computation of PMI2 is computed based on the measurement of the first pilot signal and the second pilot signal, and the computation of PMI2 depends on the computation result of PMI1, and PMI1 and PMI2 have a certain correlation.

Further, a CQI value after beamforming of 3D-MIMO by the PMI1 and the PMI2 is assumed may be calculated, and the CQI value may be fed back through the first process or the second process, and as a preferred embodiment, the CQI value may be fed back through CSI fed back by the second process.

Example two

In a possible implementation manner, the method provided in an embodiment of the present invention further includes: sending a second pilot signal to the UE through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In this embodiment, the CSI fed back by the first process is obtained by the UE through common measurement and calculation based on the first pilot signal and the second pilot signal, and the CSI fed back by the second process is also obtained by the UE through common measurement and calculation based on the first pilot signal and the second pilot signal, so that the CSI fed back by the first process and the CSI fed back by the second process have a certain correlation, and the channel state information of the antenna array can be reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO shaping, so that the base station can be directly applied to the 3D-MIMO shaping after receiving the CSI fed back by the UE, compared with the prior art that the CSI is measured and calculated by the UE on a single resource, the CSI fed back through the first process and the CSI fed back through the second process reflect the whole channel state information after the 3D-MIMO shaping together, the base station does not need to further process the received CSI, and the processing difficulty of the base station is reduced.

As a more specific embodiment, as shown in fig. 4, a base station configures a first pilot resource 402 and a second pilot resource 404, a first process 406, and a second process 408 for a UE, CSI fed back by the first process 406 is calculated based on common measurement of a first pilot signal in the first pilot resource 402 and a second pilot signal in the second pilot resource 404, CSI fed back by the second process 408 is also calculated based on common measurement of the first pilot signal in the first pilot resource 402 and the second pilot signal in the second pilot resource 404, assuming that PMI information in CSI fed back by the first process 406 is denoted as PMI1, and PMI information in CSI fed back by the second process 408 is denoted as PMI2, PMI1 and PMI2 can be calculated by the following formulas:

(PMI1，PMI2)＝argopt_{V1∈codebook1，V2∈codebook2}f(g×)

h1 and H2 are channel estimation values obtained by the UE by measuring the first pilot resource 402 and the second pilot resource 404, V1 traverses in the first-dimension precoding beamforming matrix codebook1 (i.e., codebook1), and V2 traverses in the second-dimension precoding beamforming matrix codebook2 (i.e., codebook2) to find a value that makes PMI1 and PMI2 optimal, V1 and V2 each correspond to a 4-antenna codebook, that is, the PMI1 and PMI2 are calculated based on the first pilot signal and the second pilot signal, and compared with the prior art in which the PMI1 is calculated independently based on the first pilot resource and the PMI2 is calculated independently based on the second pilot resource, the PMIs 1 and PMI2 calculated in the embodiment of the present invention have a certain relevance, and better reflect the overall channel state information after 3D-MIMO.

Further, a CQI value after beamforming of 3D-MIMO by the PMI1 and the PMI2 is assumed may be calculated, and the CQI value may be fed back through the first process or the second process, and as a more preferred embodiment, the CQI value may be fed back through CSI fed back by the second process.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the CSI fed back by the first process includes: PMI information.

In specific implementation, when the CSI fed back by the first process only includes PMI information, the PMI selected by the UE should be selected in a codebook of a fixed RI, where the value of RI may be fixed, or the base station may configure an RI value through higher layer information. For example: the RI is 1, at this time, the PMI fed back by the UE is a vector and reflects a forming vector recommended by the UE, and because the RI is 1, the UE calculates the PMI only in one rank (rank), and does not need to find the optimal PMI in all ranks, the complexity of PMI calculation is correspondingly reduced, and meanwhile, since RI and CQI are not fed back, the overhead of feedback is also correspondingly reduced.

As a more specific embodiment, in the application of 3D-MIMO, a base station configures two pilot resources, where a first pilot resource corresponds to measurement of a horizontal dimension and a second pilot resource corresponds to measurement of a vertical dimension. Taking the horizontal dimension as an example, the application of the vertical dimension can be equally used, which is not described herein. The base station configures the UE to feed back the PMI in the vertical dimension, and feeds back the RI, the PMI and the CQI in the horizontal direction, and the PMI in the vertical dimension reflects the information of the vertical dimension forming vector fed back by the UE.

The measurement of the RI, PMI and CQ in the horizontal dimension is obtained by jointly measuring the second pilot resource in the vertical dimension and the first pilot resource in the horizontal dimension, that is, when the RI, CQI and PMI in the horizontal dimension are measured by the UE, the PMI in the vertical dimension is also used for the calculation.

The PMI feedback in the vertical dimension may be periodic or aperiodic.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the CSI fed back by the first process further includes: and Rank Indication (RI) information corresponding to the PMI information.

In specific implementation, the CSI fed back by the first process further includes RI information corresponding to the PMI information, and the fed-back PMI information corresponds to the fed-back RI, for example: when RI is 1, PMI information is calculated only in one fixed rank, and it is not necessary to find an optimal PMI in all ranks. Meanwhile, the CSI fed back by the first process does not contain CQI information, so that the calculation difficulty and the feedback overhead of the UE are reduced.

Specifically, when feedback is performed through the first process, feedback of the PMI and the RI may be fed back in the same subframe by adopting a manner shown in fig. 5A, and feedback periods are the same; feedback may also be performed in the manner shown in fig. 5B, but the feedback periods of the PMI and the RI are different, and the feedback period of the PMI is smaller than the feedback period of the RI, and of course, feedback may also be performed in different subframes by using the manner shown in fig. 5C, and the feedback periods are configured independently.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the CSI fed back by the second process includes: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the second process and the PMI information fed back by the first process.

It should be noted that, when the CSI fed back by the first process includes PMI information or a combination of PMI information and RI information, the CSI information fed back by the second process should include PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the second process and the PMI information fed back by the first process, that is, the CQI information is a CQI value obtained by beamforming an antenna array based on the PMI information fed back by the first process and the PMI information fed back by the second process, so as to reflect the overall channel state information after 3D-MIMO beamforming.

Of course, it should be understood by those skilled in the art that, in another embodiment, when the CSI fed back by the second process includes PMI information or a combination of PMI information and RI information, the CSI information fed back by the first process should include PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the first process and the PMI information fed back by the second process.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the first process, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the second process.

In specific implementation, when the base station configures two pilot resources for the UE, the number of antenna ports of each pilot resource is equal to the number of antenna ports corresponding to the CSI fed back through the first process and the second process. For example: for a 4 × 4 antenna array, the first pilot frequency resource corresponds to a horizontal dimension, and the dimension is 4 antennas, so that the number of antenna ports corresponding to CSI fed back through the first process is also 4; the second pilot resource corresponds to a vertical dimension, and the dimension is 4 antennas, and then the number of antenna ports corresponding to the CSI fed back through the second process is also 4.

In specific implementation, the configuration period of the first pilot resource and the configuration period of the second pilot resource may be different, and preferably, the configuration period of the first pilot resource is L times of the configuration period of the second pilot resource, where L is a positive integer greater than or equal to 1, for example: the first pilot resource corresponds to a vertical dimension, the second pilot resource corresponds to a horizontal dimension, and when the UE moves relative to the base station, the speed of the UE moving in the horizontal dimension is much higher than the speed of the UE moving in the vertical dimension.

Preferably, a feedback period of the CSI fed back by the first process and a feedback period of the CSI fed back by the second process may be different, where the feedback period of the CSI fed back by the first process is L times that of the CSI fed back by the second process, where L is a positive integer greater than or equal to 1. For example, the first CSI process is used to feed back channel information in a vertical dimension, the second CSI process is used to feed back channel information in a horizontal dimension, and when the UE moves relative to the base station, the moving speed of the UE in the horizontal dimension is much higher than the moving speed of the UE in the vertical dimension relative to the base station, so the rate of the horizontal dimension feedback may be faster than the rate of the vertical dimension feedback.

In a possible implementation manner, in the method provided in the embodiment of the present invention, the first pilot resource and the second pilot resource are channel state information reference signal CSI-RS resources or common reference signal CRS resources.

Correspondingly, on the user equipment side, the feedback method of the channel state information CSI provided by the embodiment of the present invention, as shown in fig. 6, includes:

step 602, a user equipment UE determines a first pilot resource, a first process and a second process that a network side configures for the UE in advance;

step 604, the UE calculates to obtain a first CSI and a second CSI at least based on a first pilot signal measurement sent by the network side through the first pilot resource;

and 606, the UE feeds back the first CSI to the network side through the first process, and feeds back the second CSI to the network side through the second process.

In the method provided by the embodiment of the present invention, the UE obtains the second CSI and the second CSI at least based on the measurement and calculation of the first pilot signal, the first CSI and the second CSI are obtained at least based on the measurement and calculation of the first pilot signal, and the channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the method provided by the embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the first CSI is N1, the number of antenna ports corresponding to the second CSI is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in a method provided by an embodiment of the present invention, the first CSI includes: precoding Matrix Indication (PMI) information; the second CSI includes: PMI information and Channel Quality Indication (CQI) information, wherein the CQI information is obtained by the UE based on the PMI information in the first CSI and the PMI information in the second CSI.

In a possible implementation manner, the method provided in an embodiment of the present invention further includes: the UE determines a second pilot frequency resource configured for the UE in advance by a network side; the UE obtains the first CSI and the second CSI by measuring and calculating at least based on a first pilot signal sent by the network side through the first pilot resource, specifically: the UE calculates and obtains first CSI based on the first pilot signal measurement; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, the method provided in an embodiment of the present invention further includes: the UE determines a second pilot frequency resource configured for the UE in advance by a network side; the UE obtains the first CSI and the second CSI by measuring and calculating at least based on a first pilot signal sent by the network side through the first pilot resource, specifically: the UE obtains first CSI through common measurement calculation based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, in a method provided by an embodiment of the present invention, the first CSI includes: PMI information.

In a possible implementation manner, in a method provided by an embodiment of the present invention, the first CSI further includes: and Rank Indication (RI) information corresponding to the PMI information.

In a possible implementation manner, in a method provided by an embodiment of the present invention, the second CSI includes: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information in the second CSI and the PMI information in the first CSI.

On the network side, an apparatus for acquiring CSI according to an embodiment of the present invention is shown in fig. 7, and includes: a first unit 702, configured to send a first pilot signal to a user equipment UE through a first pilot resource configured for the UE in advance; a second unit 704, connected to the first unit 702, configured to receive CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back by a second process configured for the UE in advance, where the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement.

In the apparatus provided in the embodiment of the present invention, the apparatus receives CSI fed back by the UE through the first process and the second process, and the CSI is obtained by the UE through measurement and calculation based on at least the first pilot signal, and the CSI fed back through the first process and the CSI fed back through the second process are obtained through measurement and calculation based on at least the first pilot signal, and reflects channel state information of the first pilot signal from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to CSI fed back by the first process is N1, the number of antenna ports corresponding to CSI fed back by the second process is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the first unit 702 is further configured to: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the first unit 702 is further configured to: sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance; the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are: the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

In the embodiment of the present invention, the apparatus may be a network device such as a base station, wherein the first unit 702 may employ a signal transmitter or a transmitter, and the second unit 704 may employ a signal receiver or a receiver.

Referring to fig. 8, an apparatus for obtaining another CSI on a network side according to an embodiment of the present invention includes:

the processor 800, which is used to read the program in the memory 820, executes the following processes:

transmitting a first pilot signal to the user equipment UE through a first pilot resource previously configured for the UE using the transceiver 810;

receiving, by the transceiver 810, CSI fed back by the UE through a first process configured in advance for the UE and CSI fed back by a second process configured in advance for the UE, where the CSI fed back through the first process and the CSI fed back through the second process are calculated by the UE based on at least the first pilot signal measurement.

A transceiver 810 for receiving and transmitting data under the control of the processor 800.

The processor 800 is further configured to:

transmitting a second pilot signal to the UE through a second pilot resource previously configured for the user equipment UE using the transceiver 810;

receiving CSI fed back by the UE through a first process and CSI fed back through a second process through a transceiver, wherein the CSI fed back through the first process is obtained by measuring and calculating the UE based on a first pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

Processor 800, further configured to:

receiving CSI fed back by the UE through a first process and CSI fed back through a second process through a transceiver, wherein the CSI fed back through the first process is obtained by the UE through measurement calculation based on a first pilot signal and a second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a transceiver providing a means for communicating with various other apparatus over a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.

On the user equipment side, a feedback apparatus of channel state information CSI provided in an embodiment of the present invention, as shown in fig. 9, includes: a resource determining unit 902, configured to determine a first pilot resource, a first process, and a second process, which are configured by a network side in advance for a user equipment UE where the apparatus is located; a measuring unit 904, connected to the resource determining unit 902, configured to measure and calculate, based on at least a first pilot signal sent by the network side through the first pilot resource, a first CSI and a second CSI; a feedback unit 906, connected to the resource determining unit 902 and the measuring unit 904, configured to feed back the first CSI to the network side through the first process, and feed back the second CSI to the network side through the second process.

In the apparatus provided in the embodiment of the present invention, the UE where the apparatus is located obtains the second CSI and the second CSI by measurement and calculation based on at least the first pilot signal, the first CSI and the second CSI are obtained by measurement and calculation based on at least the first pilot signal, and channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to the first CSI is N1, the number of antenna ports corresponding to the second CSI is N2, and a product of N1 and N2 is equal to N.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the resource determining unit 902 is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side; the measurement unit 904 is specifically configured to: calculating to obtain first CSI based on the first pilot signal measurement; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In a possible implementation manner, in the apparatus provided in this embodiment of the present invention, the resource determining unit 902 is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side; the measurement unit 904 is specifically configured to: obtaining first CSI (channel state information) by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

In this embodiment of the present invention, the apparatus may be a part of a UE, or may also be a UE or other terminal equipment, where the resource determining unit 902 may employ a signal receiver or a receiver, the measuring unit 904 may employ a single chip or a CPU processor, and the feedback unit 906 may employ a signal transmitter or a transmitter.

Referring to fig. 10, another apparatus for feeding back CSI on the UE side according to an embodiment of the present invention includes:

the processor 100, which is used to read the program in the memory 120, executes the following processes:

determining a first pilot frequency resource, a first process and a second process which are configured for the device in advance by a network side;

the method comprises the steps that a first CSI and a second CSI are obtained at least on the basis of measurement and calculation of a first pilot signal sent by a network side through a first pilot resource;

the first CSI is fed back to the network side and the second CSI is fed back to the network side through the transceiver 110.

A transceiver 110 for receiving and transmitting data under the control of the processor 100.

The processor 100 is further configured to:

determining a second pilot frequency resource configured for the device in advance by the network side;

calculating to obtain first CSI based on the first pilot signal measurement; obtaining a second CSI (channel state information) by measuring and calculating a first pilot signal and a second pilot signal sent by a network side through a second pilot resource;

The processor 100 is further configured to:

the first CSI is obtained through measurement calculation based on the first pilot signal and a second pilot signal sent by a network side through a second pilot resource; obtaining a second CSI (channel state information) by measuring and calculating a first pilot signal and a second pilot signal sent by a network side through a second pilot resource;

Where in fig. 10 the bus architecture may include any number of interconnected buses and bridges, with various circuits of one or more processors, represented by processor 100, and memory, represented by memory 120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 110 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 130 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 100 is responsible for managing the bus architecture and general processing, and the memory 120 may store data used by the processor 100 in performing operations.

To sum up, in the embodiment of the present invention, the CSI that the base station receives the CSI fed back by the UE through the first process and the second process is calculated by the UE based on at least the first pilot signal measurement, the CSI fed back by the first process and the CSI fed back by the second process are calculated based on at least the first pilot signal measurement, and the channel state information of the first pilot signal is reflected from two dimensions, for example: the horizontal dimension and the vertical dimension reflect the whole channel state information after the 3D-MIMO forming, so that the base station can be directly applied to the 3D-MIMO forming after receiving the CSI fed back by the UE, the base station does not need to further process the received CSI, the processing difficulty of the base station is reduced, and the processing difficulty of the UE is reduced.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, 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, 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.

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

1. A method for acquiring Channel State Information (CSI) is characterized by comprising the following steps:

sending a first pilot signal to User Equipment (UE) through a first pilot resource configured for the UE in advance;

and receiving CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back through a second process configured for the UE in advance, wherein the CSI fed back through the first process and the CSI fed back through the second process are obtained by the UE through measurement and calculation at least based on the first pilot signal.

2. The method of claim 1, wherein the number of antenna ports of the first pilot resource is N, the number of antenna ports corresponding to CSI fed back by the first process is N1, the number of antenna ports corresponding to CSI fed back by the second process is N2, and a product of N1 and N2 is equal to N.

3. The method according to claim 1 or 2,

the CSI fed back by the first process comprises: precoding Matrix Indication (PMI) information;

the CSI fed back by the second process comprises: PMI information and Channel Quality Indication (CQI) information, wherein the CQI information is obtained by the UE based on the PMI information fed back by the first process and the PMI information fed back by the second process.

4. The method of claim 1, further comprising:

sending a second pilot signal to User Equipment (UE) through a second pilot resource configured for the UE in advance;

the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement, and specifically are:

the CSI fed back by the first process is calculated by the UE based on the first pilot signal measurement; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

5. The method of claim 1, further comprising:

the CSI fed back by the first process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal; and the CSI fed back by the second process is obtained by the UE through measurement and calculation based on the first pilot signal and the second pilot signal.

6. The method according to claim 4 or 5, wherein the CSI fed back by the first process comprises: PMI information.

7. The method of claim 6, wherein the CSI fed back by the first process further comprises: and Rank Indication (RI) information corresponding to the PMI information.

8. The method of claim 7, wherein the CSI fed back by the second process comprises: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information fed back by the second process and the PMI information fed back by the first process.

9. The method according to claim 4 or 5, wherein the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the first process, and the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to CSI fed back by the second process.

10. The method of claim 4 or 5, wherein a configuration period of the first pilot resource is L times a configuration period of the second pilot resource, wherein L is a positive integer greater than or equal to 1.

11. The method according to claim 4 or 5, wherein a feedback period of the CSI fed back by the first process is L times that of the CSI fed back by the second process, wherein L is a positive integer greater than or equal to 1.

12. The method of claim 4 or 5, wherein the first pilot resource and the second pilot resource are channel state information reference signal (CSI-RS) resources or Common Reference Signal (CRS) resources.

13. A method for feeding back Channel State Information (CSI), comprising:

user Equipment (UE) determines a first pilot frequency resource, a first process and a second process which are configured for the UE in advance by a network side;

the UE obtains first CSI and second CSI at least based on measurement calculation of a first pilot signal sent by a network side through the first pilot resource;

and the UE feeds the first CSI back to the network side through the first process and feeds the second CSI back to the network side through the second process.

14. The method of claim 13, wherein the first pilot resource has a number of antenna ports of N, wherein the first CSI corresponds to a number of antenna ports of N1, wherein the second CSI corresponds to a number of antenna ports of N2, and wherein a product of N1 and N2 is equal to N.

15. The method of claim 13,

the first CSI includes: precoding Matrix Indication (PMI) information;

the second CSI includes: PMI information and Channel Quality Indication (CQI) information, wherein the CQI information is obtained by the UE based on the PMI information in the first CSI and the PMI information in the second CSI.

16. The method of claim 13, further comprising:

the UE determines a second pilot frequency resource configured for the UE in advance by a network side;

the UE obtains the first CSI and the second CSI by measuring and calculating at least based on a first pilot signal sent by the network side through the first pilot resource, specifically:

the UE calculates and obtains first CSI based on the first pilot signal measurement; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

17. The method of claim 13, further comprising:

the UE obtains first CSI through common measurement calculation based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and the UE measures and calculates to obtain second CSI based on the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

18. The method of claim 16 or 17, wherein the first CSI comprises: PMI information.

19. The method of claim 18, wherein the first CSI further comprises: and Rank Indication (RI) information corresponding to the PMI information.

20. The method of claim 19, wherein the second CSI comprises: PMI information, RI information corresponding to the PMI information, and CQI information obtained based on the PMI information in the second CSI and the PMI information in the first CSI.

21. The method of claim 16 or 17, wherein the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI, and wherein the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to the second CSI.

22. An apparatus for acquiring Channel State Information (CSI), comprising:

a first unit, configured to send a first pilot signal to a user equipment UE through a first pilot resource configured for the UE in advance;

and a second unit, connected to the first unit, configured to receive CSI fed back by the UE through a first process configured for the UE in advance and CSI fed back by a second process configured for the UE in advance, where the CSI fed back by the first process and the CSI fed back by the second process are calculated by the UE based on at least the first pilot signal measurement.

23. The apparatus of claim 22, wherein the first pilot resource has a number of antenna ports of N, wherein the CSI fed back by the first process corresponds to a number of antenna ports of N1, wherein the CSI fed back by the second process corresponds to a number of antenna ports of N2, and wherein a product of N1 and N2 is equal to N.

24. The apparatus of claim 22, wherein the first unit is further configured to:

25. The apparatus of claim 22, wherein the first unit is further configured to:

26. The apparatus of claim 24 or 25, wherein the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to CSI fed back through the first process, and wherein the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to CSI fed back through the second process.

27. A device for feeding back channel state information CSI, comprising:

a resource determining unit, configured to determine a first pilot resource, a first process, and a second process that are configured in advance by a network side for a user equipment UE where the apparatus is located;

the measurement unit is connected to the resource determination unit and used for measuring and calculating to obtain first CSI and second CSI at least based on a first pilot signal sent by the network side through the first pilot resource;

and the feedback unit is connected to the resource determination unit and the measurement unit, and is configured to feed back the first CSI to the network side through the first process and feed back the second CSI to the network side through the second process.

28. The apparatus of claim 27, wherein the first pilot resource has a number of antenna ports of N, wherein the first CSI corresponds to a number of antenna ports of N1, wherein the second CSI corresponds to a number of antenna ports of N2, and wherein a product of N1 and N2 is equal to N.

29. The apparatus of claim 27, wherein the resource determining unit is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side;

the measurement unit is specifically configured to:

calculating to obtain first CSI based on the first pilot signal measurement; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

30. The apparatus of claim 27, wherein the resource determining unit is further configured to: determining a second pilot frequency resource which is configured for the UE where the device is located in advance by a network side;

the measurement unit is specifically configured to:

obtaining first CSI (channel state information) by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource; and obtaining second CSI by measuring and calculating the first pilot signal and a second pilot signal sent by the network side through the second pilot resource.

31. The apparatus of claim 29 or 30, wherein the number of antenna ports of the first pilot resource is equal to the number of antenna ports corresponding to the first CSI, and wherein the number of antenna ports of the second pilot resource is equal to the number of antenna ports corresponding to the second CSI.