CN107370522B

CN107370522B - Method and apparatus for performing precoding

Info

Publication number: CN107370522B
Application number: CN201610318336.1A
Authority: CN
Inventors: 李迅; 张闽
Original assignee: Nokia Solutions and Networks Oy; Alcatel Lucent SAS
Current assignee: Nokia Solutions and Networks Oy; Alcatel Lucent SAS
Priority date: 2016-05-13
Filing date: 2016-05-13
Publication date: 2020-04-07
Anticipated expiration: 2036-05-13
Also published as: WO2017195039A1; CN107370522A

Abstract

The invention aims to provide a method and a device for performing precoding. The method according to the invention comprises the following steps: when a reference signal sent by an eNB is received, obtaining corresponding cycle indication information by executing a mobile estimation operation, wherein the cycle indication information comprises cycle sequence information used for indicating the sequence of replacing each beam; and feeding the circulation indication information back to the eNB so that the eNB can determine the circulation sequence of each beam needing to be changed circularly based on the circulation indication information. The invention has the following advantages: according to the invention, the UE can estimate the self moving state, so that the information indicating the cycle sequence and the replacement frequency of each beam needing to be cyclically replaced is fed back to the eNB, the eNB can precode the information to be transmitted based on the cycle sequence and the replacement frequency indicated by the UE, and higher diversity gain and beamforming gain are obtained.

Description

Method and apparatus for performing precoding

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for performing precoding.

Background

Two-dimensional Multiple Input Multiple Output (MIMO) transmission is studied and adopted in the LTE system. Conventional antenna arrays are typically laterally aligned, forming beams in a horizontal plane. In the recent 3GPP conference, a three-dimensional MIMO channel propagation model is proposed.

To explore more potential gains of three-dimensional wireless channels, two-dimensional Active Antenna Array (AAA) systems have been used to form three-dimensional beams in horizontal and vertical directions so that closed-loop MIMO transmission modes can support more antenna ports. Open-loop schemes should also benefit from advanced antenna configurations in view of the high mobility of the User Equipment (UE).

An open loop MIMO scheme based on a demodulation reference signal (DMRS) is discussed in the LTE system R14, and many companies propose transparent or non-transparent transmission schemes.

For example, in the existing LTE system, an Open Loop (OL) transmission scheme is defined in TM2 (transmission mode 2) and TM 3. TM2 is Space Frequency Block Coding (SFBC) for diversity transmission of rank 1. TM3 is a large delay cyclic diversity transmission (LD-CDD) of rank 1 to 4. Current improvements to open-loop MIMO systems use advanced antenna configurations and antenna ports and support better beamforming and diversity gains through DMRS based channel estimation instead of cell specific reference signal (CRS).

A system model in dual Precoding Matrix Indicator (PMI) feedback can be expressed as follows:

y＝HW₁W₂s+n (1)

where y denotes a signal received by the UE, s denotes a signal transmitted by the eNB, n is a noise vector, and H is a channel response matrix from a transmit antenna port to a receive antenna port. W₁W₂Represents a precoding matrix, wherein W₁Representing a long-term wideband precoding matrix, which may be fed back by the UE or selected cyclically from an existing codebook. W₂Representing a short-term precoding matrix selected cyclically from an existing random codebook. Wherein, W₁For reducing the channel dimension, W₂For open loop precoding. Such open-loop MIMO is referred to as a semi-open-loop MIMO scheme. If W is₁And W₂Are cyclically selected from the codebook or a subset thereof, and are referred to as pure open-loop MIMO schemes.

However, for a precoding matrix requiring cyclic selection, the eNB generally performs cyclic selection based on a predetermined cyclic sequence and cyclic frequency without considering the moving situation of the UE, and in the case that the UE moves fast, an accurate beam may not be selected to be aligned to the UE during precoding, so that high beamforming gain and diversity gain may not be obtained.

Disclosure of Invention

The invention aims to provide a method and a device for performing precoding.

According to an aspect of the present invention, there is provided a method of assisting in performing precoding in a UE, wherein an eNB included in a MIMO system and the UE store a common precoding codebook, and the eNB precodes transmission information based on a first precoding matrix corresponding to a beam used for a long term or a cyclically-changed beam and a second precoding matrix corresponding to a cyclically-changed beam, the method comprising the steps of:

a, when receiving a reference signal sent by an eNB, obtaining corresponding cycle indication information by executing a mobile estimation operation, wherein the cycle indication information comprises cycle sequence information used for indicating the sequence of replacing each beam;

b, feeding the circulation indication information back to the eNB so that the eNB can determine the circulation sequence of each beam needing to be changed circularly based on the circulation indication information.

According to an aspect of the present invention, a method of performing precoding in an eNB, wherein common precoding codebook information is stored in the eNB and a UE, the codebook information including a plurality of first and second sets of precoding matrices, the eNB precoding transmission information based on the first and second precoding matrices, the first precoding matrix corresponding to a long-term used beam or a cyclically-changed beam, and the second precoding matrix corresponding to a cyclically-changed beam, the method comprising the steps of:

a, in the process of executing UE scheduling, sending a reference signal to UE;

b, determining the circulation sequence of each beam needing to be changed circularly based on the circulation indication information from the UE;

c, based on the determined circulation sequence of each wave beam, executing precoding operation on the information to be transmitted;

and D, sending the precoded information to the UE.

According to an aspect of the present invention, there is also provided an assisting apparatus for assisting in performing precoding in a UE, wherein an eNB included in a MIMO system and the UE store a common precoding codebook, and the eNB precodes transmission information based on a first precoding matrix corresponding to a beam used for a long term or a cyclically-changed beam and a second precoding matrix corresponding to a cyclically-changed beam, the assisting apparatus comprising:

estimating means for obtaining corresponding cycle indication information by performing a motion estimation operation, wherein the cycle indication information includes cycle sequence information indicating a sequence of replacing each beam;

and a feedback device, configured to feed the cycling indication information back to the eNB, so that the eNB determines, based on the cycling indication information, a cycling order of each beam that needs to be cyclically changed.

According to an aspect of the present invention, there is also provided a precoding apparatus for performing precoding in an eNB in which common precoding codebook information is stored in the eNB and a UE, the eNB precoding transmission information based on a first precoding matrix corresponding to a beam used for a long term or a cyclically-changed beam and a second precoding matrix corresponding to a cyclically-changed beam, the precoding apparatus including:

a first sending device, configured to send a reference signal to a UE in a process of performing UE scheduling;

second determining means for determining a cycle order of each beam that needs to be cyclically changed based on the cycle indication information from the UE;

the execution device executes precoding operation on the information to be transmitted based on the determined cyclic sequence of each wave beam needing cyclic replacement;

and a second sending device, configured to send the precoded information to the UE.

Compared with the prior art, the invention has the following advantages: according to the invention, the UE can estimate the self moving state, so that the information indicating the cycle sequence and the replacement frequency of each beam needing to be cyclically replaced is fed back to the eNB, the eNB can precode the information to be transmitted based on the cycle sequence and the replacement frequency indicated by the UE, and higher diversity gain and beamforming gain are obtained.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 illustrates a flow chart of a method for performing precoding in accordance with the present invention;

fig. 2 illustrates a schematic structural diagram of an assisting apparatus for assisting in performing precoding in a UE and a precoding apparatus for performing precoding in an eNB according to the present invention.

The same or similar reference numbers in the drawings identify the same or similar elements.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Fig. 1 illustrates a schematic diagram of a method for performing precoding according to the present invention. The method according to the present invention comprises steps S101 and S102 performed by the User Equipment (UE), and steps S201, S202, S203 and S204 performed by the base station (eNB).

The method according to the present invention is implemented by a precoding device included in an eNB and an auxiliary device included in a UE.

The eNB includes, but is not limited to, a macro base station, a micro base station, a home base station, and the like.

Preferably, the eNB and the UE are both included in a MIMO system.

Wherein a common precoding codebook is stored in the eNB and the UE. The codebook information includes a plurality of first and second sets of precoding matrices, and the eNB precodes transmission information based on the first and second precoding matrices.

Wherein the first precoding matrix may correspond to a beam for long-term use, or the first precoding matrix may correspond to a cyclically-changed beam.

Wherein the second precoding matrix corresponds to a cyclically changed beam.

Referring to fig. 1, in step S201, an eNB transmits a reference signal to a UE in a process of performing UE scheduling.

Preferably, the reference signal is a Channel State Information (CSI) reference signal.

In step S101, upon receiving the reference signal sent by the eNB, the UE performs a motion estimation operation to obtain corresponding cyclic indication information.

The motion estimation operation includes various operations that can be used to predict the moving direction and moving speed of the UE.

Wherein the cycle indication information includes cycle order information indicating an order of replacing the respective beams.

For example, if the eNB cyclically selects a beam from the beams numbered 1 to 4 for precoding, the cyclic indication information may include "ascending" or "descending" to instruct the eNB to cyclically change the beams in the order of "from 1 to 4" or "from 4 to 1".

Preferably, the cycle indication information further includes cycle frequency information indicating a frequency of replacing each beam.

According to a preferred embodiment of the present invention, the first precoding matrix corresponds to a beam fed back by the UE for long-term use, and the second precoding matrix corresponds to a cyclically-changed beam, and the step S101 further includes a step S1011 (not shown) and a step S1012 (not shown).

In step S1011, when the UE receives the reference signal transmitted by the eNB, one first precoding matrix is selected from the codebook by performing a channel estimation operation.

Specifically, the UE performs a channel estimation operation based on signal-related information of the received reference signal and based on a predetermined channel estimation algorithm to select one first precoding matrix from the codebook.

The procedure for the UE to perform channel estimation should be familiar to those skilled in the art, and is not described herein again. Also, those skilled in the art should understand a variety of channel estimation algorithms, and select a suitable channel estimation algorithm to perform a channel estimation operation and select a first precoding matrix from the codebook based on actual requirements.

According to a first example of the present invention, eNB and UE _1 are included in a MIMO system, and eNB and UE _1 store the same precoding matrix codebook. The eNB precodes data to be transmitted based on the first coding matrix W1 and the second coding matrix W2. Where W1 corresponds to a beam fed back by the UE for long term use and W2 corresponds to a cyclically changed beam.

When scheduling UE _1 in step S201, the eNB transmits a reference signal RS _1 to UE _ 1. Next, UE _1 receives the reference signal RS _1 transmitted by the eNB in step S1011, and selects the first precoding matrix W1_1 from the codebook by performing a channel estimation operation. And, UE _1 feeds back the selected W1_1 to the eNB.

Continuing to describe the preferred embodiment, in step S1012, the UE obtains the corresponding cyclic indication information by performing a motion estimation operation based on the selected first precoding matrix.

Wherein the cyclic indication information includes cyclic sequence information of each beam corresponding to the second precoding matrix.

Specifically, the UE calculates current motion estimation information of the UE based on the selected first precoding matrix and based on a predetermined motion estimation algorithm. Wherein the movement estimation information is used for indicating the movement change situation of the UE. Then, the UE determines corresponding cyclic indication information based on the motion estimation information.

Preferably, the UE may calculate the motion estimation information based on the following formula:

wherein mobility represents motion estimation information, W₂Denotes a second precoding matrix, BI (·) denotes a beam number of the selected input precoding, i and j denote subframe numbers (if the same precoding is used for the period corresponding to each subframe) or i and j may denote OFDM symbol numbers in one subframe (if different precoding is used for the period corresponding to each subframe).

It can be seen that the mobility calculated by the formula can reflect the moving direction of the UE corresponding to each beam, and can reflect the moving speed of the UE in each beam direction when moving.

Continuing with the description of the foregoing first example, the first precoding matrix W1_1 selected by UE _1 corresponds to 4 beams beam _1 to beam _4, and W2 corresponds to a beam cyclically selected from the 4 beams. And, the UE calculates the mobility estimation information mobility _1 based on the above formula (2).

Preferably, the UE may also calculate the averaged motion estimation information based on the following formula:

more preferably, the motion estimation information includes motion estimation information in a horizontal direction and a vertical direction, and the UE calculates the motion estimation information in the horizontal direction and the vertical direction based on the following formulas, respectively:

wherein the mobility_HAnd mobility_vRepresenting the motion estimation information, BI, in the horizontal and vertical directions, respectively_H(. and BI)_V(. cndot.) denotes the beam number of the selected input precoding in the horizontal direction and the vertical direction, respectively.

Preferably, when the cycle indication information further includes cycle frequency information indicating a frequency of replacing each beam, the UE determines corresponding cycle frequency information based on the motion estimation information.

Preferably, the UE may obtain the corresponding cyclic frequency information based on the motion estimation information calculated based on any one of the above equations (2) to (5). For example, the UE may determine the cyclic frequency information corresponding to the calculated motion estimation information based on a predetermined relationship between the motion estimation information and the cyclic frequency.

Preferably, the UE may further determine Channel Quality Indicator (CQI) information and Rank Indicator (RI) information in combination with the cycling indicator information, so as to be fed back to the eNB together.

According to a preferred embodiment of the present invention, the eNB and the UE may represent the cycling indication information using predefined signaling information.

Preferably, the eNB and the UE may employ predefined signaling information to represent the cyclic indication information in the horizontal direction and the vertical direction, respectively.

Preferably, the eNB and the UE may employ predefined signaling information to respectively represent the cyclic indication information corresponding to different frequency domain bandwidths.

Preferably, the eNB and the UE may employ predefined signaling information to respectively represent cycle indication information corresponding to ranks (rank) of different numbers of channel matrices.

Continuing with the foregoing first example, the UE calculates the mobility estimation information mobility based on the above formula (2), and the cyclic indication information is represented in the eNB and the UE using Cyclic Indication (CI) values as described in table 1 below, each CI value corresponding to a specific cyclic direction, cyclic frequency, and mobility value range. And, the circulation direction includes an "ascending order" and a "descending order" of beam numbers, and both the circulation frequency and the motion estimation information mobility are in units of a predefined long-term feedback interval (LFT).

TABLE 1

UE _1 determines that its corresponding CI value is "001" based on the calculated value of mobility _1 and based on table 1 above.

According to another preferred embodiment of the present invention, when the first precoding matrix and the second precoding matrix both correspond to cyclically-changed beams, the cyclic indication information further includes a cyclic order of each beam corresponding to the first precoding matrix, and the step S101 further includes a step S1013 (not shown).

In step S1013, the UE obtains the cyclic indication information corresponding to the first precoding matrix by performing a motion estimation operation based on the first precoding matrix.

Specifically, the UE obtains the cyclic indication information corresponding to the first precoding matrix in a similar manner as performing steps S1011 and S1012 described above.

Preferably, the UE may obtain the motion information corresponding to the second precoding matrix based on any one of the above equations (2) to (5), and calculate the motion estimation information corresponding to the first precoding matrix based on the following equation:

wherein, W₁Representing the first precoding matrix, BI (-) representing the W of the selected input precoding₁The sequence numbers i and j represent subframe sequence numbers (if the same precoding is used for the period corresponding to each subframe) or i and j may represent OFDM symbol sequence numbers in one subframe (if different precoding is used for the period corresponding to each subframe).

Continuing to refer to fig. 1, in step S102, the UE feeds back the cycle indication information to the eNB, so that the eNB determines a cycle order of each beam that needs to be cyclically changed based on the cycle indication information.

Next, in step S202, the eNB determines the order of the cycles of the beams that need to be cyclically changed, based on the cycle indication information from the UE.

Preferably, when the cycle indication information further includes cycle frequency information, the eNB determines a cycle sequence and a replacement frequency of each beam that needs to be cyclically replaced according to the cycle indication information.

Next, in step S203, the eNB performs a precoding operation on information to be transmitted based on the determined cyclic order of the respective beams.

Preferably, when the cyclic indication information further includes cyclic frequency information, the eNB performs a precoding operation on the information to be transmitted according to the determined cyclic sequence and replacement frequency of each beam.

Next, in step S204, the eNB transmits the precoded information to the UE.

Continuing with the description of the foregoing first example, the eNB determines, based on the cycling indication information "001" from the UE _1 and based on table 1 above, that the cycling order of the corresponding beams of the second precoding matrix is an ascending order of beam numbers, i.e., cycles in the order of beam _1 to beam _4, and the time interval for replacing each beam is LFI/2. Then, the eNB performs a precoding operation on information to be transmitted based on the determined cyclic order "beam _1 to beam _ 4" and the replacement frequency "LFI/2".

Preferably, the eNB also precodes a demodulation reference signal (DMRS) based on the first coding matrix and/or the second coding matrix, and transmits the precoded DMRS to the UE together with data to be transmitted.

Then, the UE performs a corresponding demodulation operation on the precoded information from the eNB.

Preferably, the UE receives the precoded DMRS from the eNB, performs channel estimation on the DMRS, and performs a corresponding demodulation operation on the precoded DMRS.

If the eNB performs precoding operation on the DMRS based on the first coding matrix only, the UE performs corresponding demodulation operation on the precoded DMRS based on the known second coding matrix.

And if the eNB performs precoding operation on the DMRS based on the first coding matrix and the second coding matrix, the UE performs corresponding demodulation operation on the precoded DMRS.

According to the method, the UE can estimate the self moving state, so that the information indicating the cycle sequence and the replacement frequency of each beam needing to be cyclically replaced is fed back to the eNB, the eNB can precode the information to be transmitted based on the cycle sequence and the replacement frequency indicated by the UE, and higher diversity gain and beamforming gain are obtained.

The auxiliary device according to the invention comprises a predictive device 101 and a feedback device 102.

The pre-coding device according to the present invention comprises a first transmitting means 201, a first determining means 202, an executing means 203 and a second transmitting means 204.

Referring to fig. 2, in the process of performing UE scheduling, a first transmission apparatus 201 transmits a reference signal to a UE.

When receiving the reference signal sent by the eNB, the estimation apparatus 101 obtains the corresponding cycle indication information by performing a motion estimation operation.

According to a preferred embodiment of the present invention, the first precoding matrix corresponds to a beam fed back by the UE for long term use, the second precoding matrix corresponds to a cyclically changed beam, and the estimating device 101 further comprises a channel estimating device (not shown) and a motion estimating device (not shown).

When receiving a reference signal transmitted by the eNB, the channel estimation apparatus selects a first precoding matrix from the codebook by performing a channel estimation operation.

Specifically, the channel estimation apparatus selects one first precoding matrix from the codebook based on the signal-related information of the received reference signal and performs a channel estimation operation based on a predetermined channel estimation algorithm.

The process of the channel estimation performed by the channel estimation device should be familiar to those skilled in the art, and will not be described herein again. Also, those skilled in the art should understand a variety of channel estimation algorithms, and select a suitable channel estimation algorithm to perform a channel estimation operation and select a first precoding matrix from the codebook based on actual requirements.

When the eNB schedules UE _1, the first transmitting apparatus 201 transmits a reference signal RS _1 to UE _ 1. Then, UE _1 receives a reference signal RS _1 transmitted by the eNB, and the channel estimation apparatus selects a first precoding matrix W1_1 from the codebook by performing a channel estimation operation. And, UE _1 feeds back the selected W1_1 to the eNB.

Continuing with the description of the preferred embodiment, the mobile estimation apparatus performs a mobile estimation operation based on the selected first precoding matrix to obtain corresponding cyclic indication information.

Specifically, the motion estimation apparatus further includes a calculation apparatus (not shown) and a first determination apparatus (not shown).

The calculation means calculates current motion estimation information of the UE based on the selected first precoding matrix and based on a predetermined motion estimation algorithm. Wherein the movement estimation information is used for indicating the movement change situation of the UE. Then, the first determining means determines the corresponding cycle indication information based on the motion estimation information.

Preferably, the calculation means may calculate the movement estimation information based on the following formula:

Continuing with the description of the foregoing first example, the first precoding matrix W1_1 selected by UE _1 corresponds to 4 beams beam _1 to beam _4, and W2 corresponds to a beam cyclically selected from the 4 beams. Then, the calculation means calculates the movement estimation information mobility _1 based on the above formula (2).

Preferably, the calculation means may further calculate the averaged movement estimation information based on the following formula:

Preferably, when the cycle indication information further includes cycle frequency information indicating a frequency of replacing each beam, the first determining means further includes sub-determining means (not shown).

The sub-determination means determines the corresponding cycle frequency information based on the motion estimation information.

Preferably, the UE may obtain the corresponding cycle frequency information based on the motion estimation information calculated based on any one of the above equations (2) to (5) by the sub-determination device. For example, the sub-determination means may determine the cycle frequency information corresponding to the calculated motion estimation information based on a predetermined relationship between the motion estimation information and the cycle frequency.

Continuing with the foregoing first example, the computing device computes the mobility estimation information mobility based on the above equation (2), and the cyclic indication information is represented in the eNB and the UE using Cyclic Indication (CI) values as described in table 1 below, each CI value corresponding to a particular cyclic direction, cyclic frequency, and mobility value range. And, the circulation direction includes an "ascending order" and a "descending order" of beam numbers, and both the circulation frequency and the motion estimation information mobility are in units of a predefined long-term feedback interval (LFT).

TABLE 2

The first determination means determines that its corresponding CI value is "001" based on the calculated value of mobility _1 and based on table 2 above.

According to another preferred embodiment of the present invention, when the first precoding matrix and the second precoding matrix both correspond to cyclically changed beams, the cyclic indication information further includes a cyclic order of each beam corresponding to the first precoding matrix, and the pre-estimating device 101 further includes a sub-estimating device (not shown).

The second determining means obtains the cyclic indication information corresponding to the first precoding matrix by performing a motion estimation operation based on the first precoding matrix.

Specifically, the sub-estimation means obtains the cyclic indication information corresponding to the first precoding matrix by performing operations similar to those of the calculation means and the first determination means.

Preferably, the calculating means in the UE may obtain the motion information corresponding to the second precoding matrix based on any one of the above equations (2) to (5), and calculate the motion estimation information corresponding to the first precoding matrix by the sub-prediction means in the UE based on the following equation:

wherein, W₁Representing the first precoding matrix, BI (-) representing the W of the selected input precoding₁The sequence numbers i and j represent sub-frame sequence numbers (if the same precoding is used for the corresponding period of each sub-frame) or i and j may represent a sub-frameThe OFDM symbol number in the frame (if different precoding is used for the period corresponding to each subframe).

With continued reference to fig. 2, the feedback device 102 then feeds back the cycling indication information to the eNB, so that the eNB determines a cycling order of each beam that needs to be cyclically changed based on the cycling indication information.

Next, the second determination device 202 determines the cycle order of each beam that needs to be cyclically changed, based on the cycle indication information from the UE.

Preferably, when the cycle indication information further includes cycle frequency information, the second determining device 202 determines the cycle sequence and the replacement frequency of each beam that needs to be cyclically replaced according to the cycle indication information.

Then, the performing device 203 performs a precoding operation on the information to be transmitted based on the determined cyclic order of the respective beams.

Preferably, when the circulation indication information further includes circulation frequency information, the executing device 203 executes a precoding operation on the information to be transmitted according to the determined circulation sequence and replacement frequency of each beam.

Then, the second transmitting device 204 transmits the precoded information to the UE.

Continuing with the description of the foregoing first example, the second determining means 202 determines, based on the circulation indication information "001" from UE _1 and based on table 2 above, that the circulation order of the corresponding respective beams of the second precoding matrix is in ascending order of beam numbers, i.e., in the order of beam _1 to beam _4, and that the time interval for replacing the respective beams is LFI/2. Next, the performing means 203 performs a precoding operation on the information to be transmitted based on the determined cyclic order "beam _1 to beam _ 4" and the replacement frequency "LFI/2".

According to the scheme of the invention, the UE can estimate the self moving state, so that the information indicating the cycle sequence and the replacement frequency of each beam needing to be cyclically replaced is fed back to the eNB, the eNB can precode the information to be transmitted based on the cycle sequence and the replacement frequency indicated by the UE, and higher diversity gain and beamforming gain are obtained.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. A plurality of units or means recited in the system claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Claims

1. A method for assisting in performing precoding in a UE, wherein a common precoding codebook is stored in an eNB and a UE included in a MIMO system, and the eNB precodes transmission information based on a first precoding matrix corresponding to a long-term used beam or a cyclically-changed beam and a second precoding matrix corresponding to a cyclically-changed beam, the method comprising the steps of:

a, when a reference signal sent by an eNB is received, performing mobile estimation operation based on a first precoding matrix to obtain corresponding cycle indication information, wherein the cycle indication information comprises cycle sequence information used for indicating the sequence of replacing each beam;

2. The method of claim 1, wherein the first precoding matrix corresponds to a long-term used beam and the second precoding matrix corresponds to a cyclically changed beam, the step a comprises the steps of:

a1 selecting a first precoding matrix from the codebook by performing a channel estimation operation when receiving a reference signal transmitted by the eNB;

a2 obtaining corresponding cycle indication information by executing the mobile estimation operation based on the selected first precoding matrix, wherein the cycle indication information includes cycle sequence information of each beam corresponding to the second precoding matrix.

3. The method of claim 2, wherein the step a2 includes the steps of:

a21 calculating the current mobile estimation information of UE based on the selected first pre-coding matrix and based on the preset mobile estimation algorithm;

a22, based on the motion estimation information, determining corresponding cycle indication information, wherein the cycle indication information includes cycle sequence information of each beam corresponding to the second precoding matrix.

4. The method according to claim 3, wherein the cyclic indication information further includes cyclic frequency information indicating a frequency of replacing each beam corresponding to the second precoding, and the step a22 further includes the steps of:

-determining, based on the movement estimation information, corresponding cyclic frequency information.

5. The method according to claim 1, wherein the first precoding matrix and the second precoding matrix each correspond to cyclically changed beams, the cyclic indication information further includes cyclic indication information corresponding to the first precoding matrix, and the step a further includes the steps of:

a3 obtains the cyclic indication information corresponding to the first precoding matrix by performing a motion estimation operation based on the first precoding matrix.

6. A method of performing precoding in an eNB, wherein common precoding codebook information is stored in the eNB and a UE, the codebook information including a plurality of first and second sets of precoding matrices, the eNB precoding transmission information based on the first and second precoding matrices, the first precoding matrix corresponding to a long-term used beam or a cyclically-changed beam, and the second precoding matrix corresponding to a cyclically-changed beam, the method comprising the steps of:

a, in the process of executing UE scheduling, sending a reference signal to UE;

and D, sending the precoded information to the UE.

7. The method of claim 6, wherein the cycle indication information further includes cycle frequency information, the step B comprising the steps of:

-determining a cycle order and a replacement frequency of each beam requiring cycle replacement according to the cycle indication information;

wherein the step C comprises the following steps:

-performing a precoding operation on the information to be transmitted according to the determined cyclic order and the replacement frequency of the respective beams.

8. An assistance apparatus for assisting in performing precoding in a UE, wherein an eNB included in a MIMO system and the UE store a common precoding codebook, and the eNB precodes transmission information based on a first precoding matrix corresponding to a long-term-used beam or a cyclically-changed beam and a second precoding matrix corresponding to a cyclically-changed beam, the assistance apparatus comprising:

9. The assisting apparatus according to claim 8, wherein the first precoding matrix corresponds to a long-term used beam and the second precoding matrix corresponds to a cyclically changed beam, the estimating apparatus includes:

channel estimation means for selecting a first precoding matrix from the codebook by performing a channel estimation operation when receiving a reference signal transmitted by the eNB;

and the mobile estimation device is used for executing mobile estimation operation based on the selected first precoding matrix to obtain corresponding cycle indication information, wherein the cycle indication information comprises cycle sequence information of each beam corresponding to the second precoding matrix.

10. The assistance device of claim 9, wherein the movement estimation device comprises:

calculating means for calculating current motion estimation information of the UE based on the selected first precoding matrix and based on a predetermined motion estimation algorithm;

a first determining device, configured to determine, based on the motion estimation information, corresponding cyclic indication information, where the cyclic indication information includes cyclic order information of each beam corresponding to the second precoding matrix.

11. The assistance apparatus according to claim 10, wherein the cycle indication information further includes cycle frequency information indicating a frequency of replacing each beam corresponding to the second precoding, and the first determination apparatus further includes:

and a sub-determination device for determining the corresponding cycle frequency information based on the motion estimation information.

12. The assisting apparatus according to claim 8, wherein the first precoding matrix and the second precoding matrix each correspond to a cyclically changed beam, the cyclic indication information further includes cyclic indication information corresponding to the first precoding matrix, and the estimating apparatus further includes:

and the sub-estimation device is used for obtaining the circulation indication information corresponding to the first pre-coding matrix by executing the motion estimation operation based on the first pre-coding matrix.

13. A precoding apparatus that performs precoding in an eNB storing common precoding codebook information in the eNB and a UE, the eNB precoding transmission information based on a first precoding matrix corresponding to a beam used for a long term or a cyclically changed beam and a second precoding matrix corresponding to a cyclically changed beam, the precoding apparatus comprising:

the executing device executes precoding operation on the information to be transmitted based on the determined circulation sequence of each wave beam;

14. The precoding apparatus of claim 13, wherein the cycling indication information further comprises cycling frequency information, the second determining means is configured to:

wherein the execution device is configured to: