CN102932114A - Uplink precoding emitting method and device - Google Patents

Abstract

The present invention discloses an uplink precoding transmission method and device. When a base station judges that UE autonomous uplink precoding is allowed, it notifies the UE to adopt an autonomous uplink precoding mode for uplink precoding transmission. With the present invention, the UE can autonomously perform uplink precoding transmission, which overcomes the problem that the codebook selected by the eNode B cannot match the channel well when the previous uplink simply uses the precoding matrix issued by the eNode B for uplink transmission , so as to better match the channel, improve the uplink transmission performance, and reduce the system packet error rate; and if the non-codebook precoding method is used, it can further overcome the quantization error of the codebook, accurately match the channel, and improve the uplink link performance.

Description

A method and device for uplink precoding transmission

technical field

The present invention relates to the field of communication technology, in particular to an uplink precoding transmission method and device.

Background technique

MIMO (Multiple Input Multiple Output) precoding technology is divided into codebook-based precoding and non-codebook precoding.

The codebook-based precoding technology means that both the sending end and the receiving end know the same quantized codebook in advance, and the system selects an appropriate precoding matrix from the codebook according to certain criteria to precode the sending user. The advantage of the codebook-based precoding technology is that the amount of feedback information is small, but the disadvantage is that the codebook elements are limited and there are quantization errors.

The non-codebook precoding technology means that the transmitting end or receiving end calculates the precoding matrix in real time according to all or part of the Channel State Information (CSI) to precode the transmitted data. The disadvantage is that the amount of feedback information is large, and the advantage is that it can better match the channel and improve link performance. The LTE (Long Term Evolution, long-term evolution) system adopts both codebook-based precoding and non-codebook precoding. Among them, the non-codebook precoding technology is mainly used in the TDD (Time Division Duplex, Time Division Duplex) system.

The LTE TDD mode adopts the time division duplex mode, and the uplink and downlink channels occupy the same frequency resource, which has natural channel reciprocity, and is very suitable for using non-codebook precoding technology to improve downlink performance. The basic operation process of LTE TDD system downlink non-codebook precoding is as follows: First, estimate Obtaining the uplink channel is equivalent to obtaining the downlink channel according to channel reciprocity. Secondly, the downlink transmission precoding matrix is estimated according to the equivalent downlink channel, and the precoding matrix estimation method based on EBB (Eigen Based Beamforming, eigenvector forming algorithm) is usually used. Finally, during downlink transmission, the estimated precoding matrix is used to perform the same precoding on the transmitted data and UE (User Equipment, user equipment) specific reference signal (UE-Specific RS). At the receiving end, the UE uses the UE-specific reference signal to perform channel estimation to obtain the downlink channel, thereby recovering the downlink transmission data.

UL-MIMO (uplink MIMO) is introduced into the LTE-A (Long Term Evolution Advanced) system, which supports maximum 4-antenna transmission on the UE side. In the prior art, codebook-based precoding is used for uplink transmission. The base station estimates the uplink channel according to the reference signal sent by the UE, and searches for a precoding matrix that best matches it from the codebook. This precoding matrix is in the codebook The serial number in this book is called Precoding Matrix Indicator (PMI for short), and then the PMI is sent to the UE, and the UE mechanically uses the precoding matrix corresponding to the PMI to perform precoding when transmitting uplink. to approximately match the uplink channel. However, due to the unavoidable quantization error in the process of codebook quantization, and the codebook can only be searched in a limited space, it cannot match the channel well. Therefore, the uplink precoding transmission process in the prior art does not make full use of the TDD channel reciprocity feature.

Contents of the invention

The technical problem solved by the present invention is to provide an uplink precoding transmission method and device. In the LTE-ATDD uplink MIMO situation, the TDD channel reciprocity is fully utilized, so that the UE can perform uplink precoding transmission more autonomously.

In order to solve the above technical problems, the present invention provides an uplink precoding transmission method, the method comprising:

When the base station judges that autonomous uplink precoding is allowed, the base station notifies the UE to perform uplink precoding transmission in an autonomous uplink precoding mode.

Further, the autonomous uplink precoding mode refers to:

The UE uses the uplink precoding matrix corresponding to the PMI sent by the base station to perform uplink precoding;

Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI delivered by the base station, and uses the corrected uplink precoding matrix to perform uplink precoding;

Or, the UE performs uplink precoding using an uplink precoding matrix corresponding to the independently calculated PMI;

Or, the UE performs uplink precoding in a non-codebook manner.

Further, when the base station learns that the PMI value calculated by the UE is different from the PMI value calculated by the base station according to the precoding matrix indication (PMI) information reported by the UE, it judges that the UE is allowed to perform autonomous uplink precoding .

Further, when the base station learns that the UE is not currently in a multi-user MIMO (MU-MIMO) mode according to the multiple-input multiple-output (MIMO) mode of the UE, it judges that the UE is allowed to perform autonomous uplink precoding, and The base station does not schedule it in the MU-MIMO mode temporarily.

Further, when the base station notifies the UE to adopt the autonomous uplink precoding mode, it also instructs the UE to estimate the uplink precoding matrix, including:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the base station sends a reference signal for channel estimation to the UE while notifying the UE to adopt an autonomous uplink precoding mode;

The reference signal used for channel estimation includes one or more of the following: downlink measurement reference signal (CSI-RS), cell-specific reference signal (Cell-Specific RS) or UE-specific reference signal (UE-Specific RS).

Further, the base station notifies the UE to adopt the autonomous uplink precoding mode through control signaling.

Further, the method also includes:

The base station measures the effect of autonomous uplink precoding of the UE, and decides whether to notify the UE to terminate the autonomous uplink precoding mode according to the measured effect.

Further, in the case of no open-loop link adaptation (OLLA), the base station judges whether to notify the UE to terminate the autonomous precoding mode according to the statistical block error rate (BLER) value, and if the statistical BLER value is higher than the target The BLER value, or the difference between the target BLER value and the target BLER value is less than a predetermined first threshold value, then notify the UE to terminate the autonomous precoding mode;

In the case of OLLA, the base station compares the CQI in autonomous precoding mode with the CQI value calculated by the base station based on the issued PMI, and if the CQI value in autonomous precoding mode is lower than the CQI value calculated by the base station , or the difference between the two is smaller than a predetermined second threshold, the UE is notified to terminate the autonomous precoding mode.

Further, the base station calculates the difference between the PMI value actually used by the UE and the PMI value sent by the base station according to the PMI value actually used fed back by the UE, if the difference is smaller than a predetermined third threshold limit, then notify the UE to terminate the autonomous precoding mode;

Alternatively, the base station obtains the actually used precoding matrix according to the correction amount of the actually used precoding matrix fed back by the UE relative to the uplink precoding matrix corresponding to the PMI value sent by the base station, and calculates the autonomous precoding mode and compare it with the CQI value calculated by the base station based on the delivered PMI, if the calculated CQI value in the autonomous precoding mode is lower than the CQI value calculated by the base station based on the delivered PMI , or the difference between the two is smaller than a predetermined fourth threshold, the UE is notified to terminate the autonomous precoding mode.

The present invention also provides an uplink precoding transmission method,

The UE receives the notification from the base station, and uses the autonomous uplink precoding mode to perform uplink precoding transmission;

Wherein, the autonomous uplink precoding mode refers to: the UE uses the uplink precoding matrix corresponding to the PMI delivered by the base station to perform uplink precoding; or, the UE uses the uplink precoding matrix corresponding to the PMI delivered by the base station; A correction amount is added to the precoding matrix, and the uplink precoding is performed using the revised uplink precoding matrix; or, the uplink precoding is performed using the uplink precoding matrix corresponding to the PMI independently calculated by the UE; or, the UE adopts Perform uplink precoding in a non-codebook manner.

Further, the process of uplink precoding transmission specifically includes:

The UE estimates downlink channel information according to the reference signal sent by the base station, and uses the uplink channel information obtained by channel reciprocity;

The UE estimates an uplink precoding matrix according to the obtained uplink channel information, and uses the estimated uplink precoding matrix to perform uplink precoding transmission.

Further, the method also includes:

The UE reports PMI information to the base station according to a preset reporting policy, and the PMI information includes:

The PMI value calculated by the UE;

Or, an indication that the PMI value calculated by the UE is different from the PMI value delivered by the base station.

Further, the preset reporting strategy includes:

If the UE finds that the calculated PMI value is different from the PMI value issued by the base station, report the calculated PMI information to the base station;

Or, the UE periodically reports the calculated PMI value to the base station.

Further, the UE selects a way of estimating the uplink precoding matrix according to the following instructions from the base station:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the method also includes:

After the UE adopts the autonomous uplink precoding mode to perform uplink precoding transmission, it feeds back the PMI value actually used to the base station, or feeds back to the base station an uplink precoding matrix corresponding to the PMI issued by the base station. A correction amount of , so that the base station measures the effect of the UE autonomous uplink precoding.

The present invention also provides an uplink precoding transmitting device, the device includes an uplink transmission mode notification unit in a base station, wherein:

The uplink transmission mode notification unit is used for judging whether UE autonomous uplink precoding is allowed, and notifying the UE to adopt autonomous uplink precoding mode for uplink precoding transmission when UE autonomous uplink precoding is allowed.

Further, the uplink transmission mode notification unit is used to judge whether to allow UE autonomous uplink precoding in the following manner:

According to the precoding matrix indicator (PMI) information reported by the UE, when it is known that the PMI value calculated by the UE is different from the PMI value calculated by the base station, determine to allow the UE to allow autonomous uplink precoding;

And/or, according to the multiple-input multiple-output (MIMO) mode of the UE, when it is known that the UE is not currently in a multi-user MIMO (MU-MIMO) mode, it is determined that autonomous uplink precoding of the UE is allowed, and the The base station does not schedule it in MU-MIMO mode temporarily.

Further, the uplink transmission mode notification unit is further configured to, while notifying the UE to adopt the autonomous uplink precoding mode, also instruct the UE to estimate the way of the uplink precoding matrix, including:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the device further includes a reference signal sending unit,

The reference signal sending unit is configured to send a reference signal for channel estimation to the UE;

The reference signal used for channel estimation includes one or more of the following: CSI-RS, Cell-Specific RS or UE-Specific RS.

Further, the device further includes a control signaling sending unit,

The control signaling issuing unit is configured to notify the UE to adopt the autonomous uplink precoding mode by sending the control signaling to the UE.

Further, the device also includes an autonomous effect measurement unit,

The autonomous effect measuring unit is configured to measure the effect of the UE autonomous uplink precoding;

The uplink transmission mode notifying unit is further configured to determine whether to notify the UE to terminate the autonomous uplink precoding mode according to the effect measured by the autonomous effect measuring unit.

Further, the autonomous effect measurement unit is used to: in the case of no OLLA, count the BLER value; or, in the case of OLLA, compare the CQI in the autonomous precoding mode with the CQI calculated by the base station based on the issued PMI CQI values are compared; or, according to the actual PMI value fed back by the UE, calculate the difference between the PMI value actually used by the UE and the PMI value sent by the base station; or, according to the actual PMI value fed back by the UE The used precoding matrix is relative to the correction amount of the precoding matrix corresponding to the PMI value delivered by the base station, to obtain the actually used precoding matrix, calculate the CQI value in the autonomous precoding mode and compare it with the base station based on the delivered Compared with the CQI value calculated by the PMI;

The uplink transmission mode notification unit is configured to, in the case of no OLLA, if the BLER value counted by the autonomous effect measurement unit is higher than the target BLER value, or the difference between the target BLER value and the target BLER value is smaller than a predetermined first threshold value, notify the UE to terminate the autonomous precoding mode; or, in the case of OLLA, if the CQI value in the autonomous precoding mode is lower than the CQI value calculated by the base station, or the difference between the two is smaller than the predetermined second gate limit value, notify the UE to terminate the autonomous precoding mode; The UE terminates the autonomous precoding mode; or, if the CQI value calculated by the autonomous effect measuring unit in the autonomous precoding mode is lower than the CQI value calculated by the base station based on the delivered PMI, or the difference between the two is less than If the predetermined fourth threshold is set, the UE is notified to terminate the autonomous precoding mode.

The present invention also provides an uplink precoding transmitting device, the device includes an uplink precoding matrix estimation unit and an uplink precoding transmitting unit in UE, wherein:

The uplink precoding matrix estimating unit is used to estimate the uplink precoding matrix in an autonomous uplink precoding mode according to the notification of the base station;

The uplink precoding transmitting unit is configured to use the uplink precoding matrix estimated by the uplink precoding matrix estimating unit to perform uplink precoding transmission.

Further, the uplink precoding matrix estimation unit is used for:

performing uplink precoding using an uplink precoding matrix corresponding to the PMI issued by the base station;

Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI issued by the base station, and uses the corrected uplink precoding matrix to perform uplink precoding;

Or, use the uplink precoding matrix corresponding to the PMI independently calculated by the UE to perform uplink precoding;

Alternatively, the uplink precoding is performed in a non-codebook manner.

Further, the device also includes:

An information reporting unit, configured to report PMI information to the base station according to a preset reporting strategy, where the PMI information includes: the PMI value calculated by the UE; or, the PMI value calculated by the UE and the PMI value issued by the base station different instructions;

Wherein, the preset reporting strategy includes: if the UE finds that the calculated PMI value is different from the PMI value issued by the base station, then report the calculated PMI information to the base station; or, the UE Periodically report the calculated PMI value to the base station.

Further, the device further includes an equivalent uplink channel estimation unit, wherein:

The equivalent uplink channel estimation unit is used to estimate downlink channel information according to the reference signal sent by the base station, and use the uplink channel information obtained by channel reciprocity;

The uplink precoding matrix estimating unit is configured to estimate an uplink precoding matrix according to the uplink channel information obtained by the equivalent uplink channel estimating unit.

Further, the uplink precoding matrix estimating unit is further configured to select a way of estimating the uplink precoding matrix according to the following instructions of the base station:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the information reporting unit is further configured to feed back to the base station the PMI value actually used by the UE, or feed back to the base station the PMI value added on the basis of the uplink precoding matrix corresponding to the PMI issued by the base station. The correction amount is used to enable the base station to measure the effect of autonomous uplink precoding of the UE.

With the present invention, the UE can autonomously perform uplink precoding transmission, which overcomes the problem that the codebook selected by the eNode B cannot match the channel well when the previous uplink simply uses the precoding matrix issued by the eNode B for uplink transmission , so as to better match the channel, improve the uplink transmission performance, and reduce the system packet error rate; and if the non-codebook precoding method is used, it can further overcome the quantization error of the codebook, accurately match the channel, and improve the uplink link performance.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a UE uplink precoding transmission method according to an embodiment of the present invention;

Fig. 2 is a schematic block diagram of an uplink precoding transmission system according to an embodiment of the present invention.

Detailed ways

The uplink precoding transmission method provided in this embodiment adopts the following technical solution:

Step 1, UE reports PMI and other relevant information to eNode B;

Step 2, the eNode B notifies the UE that the autonomous uplink precoding mode can be used;

In the autonomous uplink precoding mode, the UE can use the uplink precoding matrix corresponding to the PMI sent by the base station to perform uplink precoding;

Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI issued by the base station, and uses the corrected PMI to perform uplink precoding;

Alternatively, the UE performs uplink precoding using the uplink precoding matrix corresponding to the independently calculated PMI;

Alternatively, the UE may also perform uplink precoding in a non-codebook manner.

Step 3: The eNode B sends a control signaling to the UE, notifying the UE to adopt the autonomous uplink precoding mode.

Step 4, according to the notification of the base station, the UE adopts the autonomous uplink precoding mode to perform uplink precoding transmission;

Wherein, the process of UE performing uplink precoding transmission specifically includes:

The UE uses the reference signal sent by the eNode B to estimate the downlink channel to obtain the equivalent uplink channel;

The UE estimates the uplink precoding matrix according to the equivalent uplink channel; where the uplink precoding matrix can be the uplink precoding matrix corresponding to the PMI issued by the base station, or a correction amount added to the uplink precoding matrix As a result, it may also be an uplink precoding matrix selected by the UE autonomously from the codebook and better matches the channel, or an uplink precoding matrix calculated according to channel estimation;

The UE uses the estimated uplink precoding matrix to perform uplink precoding transmission.

In step five, the eNodeB measures the effect of UE autonomous precoding to decide whether to terminate the autonomous precoding mode.

In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

As shown in Figure 1, the uplink precoding transmission method of the embodiment of the present invention mainly includes the following steps:

Step S101, UE reports PMI information to eNode B;

In order to actively report to eNode B the effect of using the codebook-based method, UE performs precoding matrix indicator (PMI) calculation, and can adopt the following reporting strategy to report PMI information to eNode B: (1) If it finds that the UE calculated The PMI is different from the PMI issued by the eNode B, and the UE actively reports the information to the eNode B; (2) The UE periodically reports the estimated PMI to the eNode B.

It should be noted that in the prior art, the UE performs downlink PMI calculation according to the actual downlink channel and the number of transmit antennas of the eNode B, but in the present invention, the uplink PMI is calculated according to the equivalent uplink channel and the number of transmit antennas of the UE calculate. For example, if the UE has 2 antennas and the eNode B has 4 antennas, then the downlink PMI calculation is based on the 4*2 downlink channel, which is selected from the 4-antenna codebook; while the uplink PMI calculation is based on the 2*4 equivalent uplink channel, selected from the 2-antenna codebook.

Specifically, the reporting method may be: (1) report the PMI value calculated by the UE to the eNode B, and suggest that the eNode B comprehensively consider the PMI value issued by the eNode B and calculated by the UE; (2) the UE indicates to the eNodeB the PMI value calculated by the UE The PMI value is different from the PMI value delivered by the eNode B to the UE. It is recommended that the eNodeB allow the UE to use the autonomous uplink precoding method. Among them, compared with the former method of reporting the PMI to the eNode B, multiple bits may be required; in the latter method, the UE only needs to tell the eNode B whether the PMI calculated by the UE is consistent with that calculated by the base station, and only 1 bit is used. Bits can be expressed.

Step S102, the eNode B judges that the UE is allowed to adopt the autonomous uplink precoding mode;

The eNode B can judge whether to allow the UE to adopt the autonomous uplink precoding method in the following way: (a) The eNode B judges whether to allow the UE to use the autonomous uplink precoding method based on the information reported by the UE, for example: for the above reporting method (1): eNode B sees that the PMI reported by the UE is quite different from the PMI it calculated. For reporting method (2): when the eNode B sees that the PMI calculated by the UE indicated by the UE is different from the PMI calculated by the eNode B, the UE can be allowed to use autonomous uplink precoding (b) The eNode B actively allows the UE to adopt an autonomous uplink precoding method. For example, the eNode B knows that the UE is not currently in MU-MIMO (Multi-User MIMO, multi-user MIMO) mode, or the eNode B sees that the UE is under the eNode B When the frame error rate is high when the PMI is transmitted, the UE may be actively notified to adopt the autonomous uplink precoding mode.

Another condition for the eNode B to allow the UE to adopt the autonomous uplink precoding method is that the eNode B knows that the UE is not currently in the MU-MIMO mode, and temporarily does not schedule it to the MU-MIMO mode. This is because, in the case of multi-user MIMO, when the UE selects the precoding matrix (PM), two factors need to be considered, one is the best matching own channel, and the other is to reduce the interference to other users as much as possible , that is, the channel correlation between the precoding matrix and other users is the lowest, and it is best to be orthogonal.

After the eNode B judges that the UE is allowed to adopt the autonomous uplink precoding mode, a feasible method for notifying the UE is to add an uplink transmission mode to distinguish it from the existing codebook-based precoding mode, for example, through RRC signaling to instruct the UE to adopt this new transmission mode.

Step S103, the eNode B sends the control signaling to the UE;

In order to send the control signaling required to adopt the new transmission mode to the UE, the implementation of this embodiment is: the eNodeB uses the downlink control information (DCI) carried by the downlink control channel (PDCCH) to send the UE uplink The control signaling is sent to the UE. For example, based on LTE R10 DCIFormat4, it can be used to send the control signaling required for uplink autonomous precoding by appropriately modifying it.

The field related to uplink precoding in DCI Format4 is "precoding information and number of layers" (Precoding information and number of layers) information. When the new autonomous uplink precoding method is adopted, precoding information (ie PMI) is no longer required, so the possible modifications to DCI Format4 are: (1) It is not necessary to send the existing "precoding information and layer number" (Precoding information and number of layers) information; (2) retain the "number of layers" (number of layers) information; (3) add a 1-bit flag to indicate that the UE can adopt the autonomous uplink precoding method.

After receiving the notification from the eNode B, the UE adopts the autonomous uplink precoding method for uplink precoding transmission, but after receiving the notification, the UE can also decide whether to use the autonomous uplink precoding method.

Furthermore, the eNode B notifies the UE that the autonomous uplink precoding method can be used, and at the same time, it can also instruct the UE to estimate the uplink precoding matrix. The first method is to use codebook-based autonomous precoding, that is, the precoding method must be selected from the codebook. Coding matrix; the second is to use non-codebook autonomous precoding, that is, the precoding matrix is not selected from the codebook; the third is to use the first method or the second method by the UE.

Step S104, the UE uses the reference signal sent by the eNode B to estimate the downlink channel, so as to obtain the equivalent uplink channel;

In order for the UE to estimate the equivalent uplink channel, the eNode B needs to send reference signals for channel estimation. For example, among the existing downlink reference signals of LTE, the downlink measurement reference signal (CSI-RS) is an optional reference signal. The number of antenna ports for sending should not be less than the number of ports for uplink sending.

The reference signal used for downlink channel estimation can also be selected: cell-specific reference signal (Cell-specific reference signal, referred to as CSRS), or UE-specific reference signal (UE-specific reference signal, referred to as UE-specific RS) .

The UE uses the reference signal sent by the eNode B on the corresponding antenna port to perform downlink channel estimation to obtain the equivalent uplink channel.

Further, in order to make the estimation result more suitable for precoding matrix estimation, the following processing can also be performed: (1) average on different granularities such as the entire bandwidth, several RBs or a single RB; (2) channel estimation results Normalization is performed to keep the total transmit power constant.

Step S105, the UE performs uplink precoding matrix estimation according to the equivalent uplink channel;

There are two methods for precoding matrix estimation: (1) codebook-based precoding matrix estimation; (2) non-codebook precoding matrix estimation.

The codebook-based precoding matrix estimation method can be to search the codebook (set of multiple precoding matrices) of the UE to best match the equivalent uplink channel, such as the precoding matrix with the largest correlation value, and use this precoding matrix to perform Uplink precoding transmission.

The non-codebook precoding matrix estimation method can be: on the basis of the precoding matrix corresponding to the PMI issued by the base station, a correction amount is added; it can also be: according to the equivalent uplink channel estimation result and the number of layers sent by the UE, Perform precoding matrix estimation. Estimation methods include but are not limited to (1) estimation methods based on eigenvectors (EBB); (2) estimation methods based on Grid of Beam (GOB for short).

Step S106, the UE performs uplink precoding transmission;

Uplink precoded transmission needs to precode the transmitted data and the demodulation reference signal at the same time. In order for the eNode B to demodulate the data transmitted through uplink precoding. For example, in an LTE system, uplink precoding may be performed on an uplink demodulation reference signal (DMRS) while performing uplink precoding on uplink transmission data.

Step S107, eNode B measures the effect of UE autonomous precoding to decide whether to terminate the autonomous precoding mode;

In the absence of feedback information from the UE, in order to measure the effect of UE autonomous precoding, the eNode B can use the statistical BLER (Block Error Rate (block error rate) value to determine whether to turn off the autonomous precoding mode, for example, if the BLER value is far lower than the target BLER value (10%), then maintain the autonomous precoding mode; if the BLER value is higher than the target BLER value or If it is equal to the target BLER value (for example, the difference between the two is smaller than the first threshold value), then the autonomous precoding mode is terminated. In the case of open-loop link adaptation, the base station can compare the CQI (Channel Quality Indicator) in the case of autonomous precoding with the CQI calculated by the base station based on the PMI issued by the base station. If the lower CQI is lower than or equal to the CQI calculated by the base station (for example, the difference between the two is smaller than the second threshold value), then the autonomous precoding mode is terminated; otherwise, the autonomous precoding mode is maintained.

In the case of feedback, the base station can measure the effect of UE autonomous precoding according to the following information fed back by the UE:

The PMI actually used by the UE or the difference (delta_PMI) between the PMI and the PMI issued by the eNode B, the eNode B judges whether to terminate the autonomous precoding mode according to the difference between the two PMIs, for example, when the difference between the two PMIs is greater than the set When the third threshold value is reached, the autonomous precoding mode is maintained, and when the difference between the two PMIs is less than or equal to the third threshold value, the autonomous precoding mode is terminated.

The correction amount of the precoding matrix actually used by the UE relative to the precoding matrix corresponding to the PMI issued by the eNode B. The eNode B obtains the actual precoding matrix based on the correction amount and the delivered PMI, calculates the CQI, and compares it with the CQI calculated by the base station based on the PMI delivered by itself. If the CQI in the case of autonomous precoding is lower than that calculated by the base station If the CQI is equal (if the difference between the two is smaller than the fourth threshold value), then the autonomous precoding mode is terminated, otherwise the autonomous precoding mode is maintained.

In addition, an uplink precoding transmitting device is also provided in an embodiment of the present invention, the device mainly includes an uplink transmission mode notification unit in a base station, wherein:

The uplink transmission mode notification unit is used for judging whether UE autonomous uplink precoding is allowed, and notifying the UE to adopt autonomous uplink precoding mode for uplink precoding transmission when UE autonomous uplink precoding is allowed.

Further, the uplink transmission mode notification unit is used to judge whether to allow UE autonomous uplink precoding in the following manner:

According to the precoding matrix indicator (PMI) information reported by the UE, when it is known that the PMI value calculated by the UE is different from the PMI value calculated by the base station, determine to allow the UE to allow autonomous uplink precoding;

And/or, according to the multiple-input multiple-output (MIMO) mode of the UE, when it is known that the UE is not currently in a multi-user MIMO (MU-MIMO) mode, it is determined that autonomous uplink precoding of the UE is allowed, and the The base station does not schedule it in MU-MIMO mode temporarily.

Further, the uplink transmission mode notification unit is further configured to, while notifying the UE to adopt the autonomous uplink precoding mode, also instruct the UE to estimate the way of the uplink precoding matrix, including:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the device further includes a reference signal sending unit,

The reference signal sending unit is configured to send a reference signal for channel estimation to the UE;

The reference signal used for channel estimation includes one or more of the following: CSI-RS, Cell-Specific RS or UE-Specific RS.

Further, the device further includes a control signaling sending unit,

The control signaling issuing unit is configured to notify the UE to adopt the autonomous uplink precoding mode by sending the control signaling to the UE.

Further, the device also includes an autonomous effect measurement unit,

The autonomous effect measuring unit is configured to measure the effect of the UE autonomous uplink precoding;

The uplink transmission mode notifying unit is further configured to determine whether to notify the UE to terminate the autonomous uplink precoding mode according to the effect measured by the autonomous effect measuring unit.

Further, the autonomous effect measurement unit is used to: in the case of no OLLA, count the BLER value; or, in the case of OLLA, compare the CQI in the autonomous precoding mode with the CQI calculated by the base station based on the issued PMI CQI values are compared; or, according to the actual PMI value fed back by the UE, calculate the difference between the PMI value actually used by the UE and the PMI value sent by the base station; or, according to the actual PMI value fed back by the UE The used precoding matrix is relative to the correction amount of the precoding matrix corresponding to the PMI value delivered by the base station, to obtain the actually used precoding matrix, calculate the CQI value in the autonomous precoding mode and compare it with the base station based on the delivered Compared with the CQI value calculated by the PMI;

The uplink transmission mode notification unit is configured to, in the case of no OLLA, if the BLER value counted by the autonomous effect measurement unit is higher than the target BLER value, or the difference between the target BLER value and the target BLER value is smaller than a predetermined first threshold value, notify the UE to terminate the autonomous precoding mode; or, in the case of OLLA, if the CQI value in the autonomous precoding mode is lower than the CQI value calculated by the base station, or the difference between the two is smaller than the predetermined second gate limit value, notify the UE to terminate the autonomous precoding mode; The UE terminates the autonomous precoding mode; or, if the CQI value calculated by the autonomous effect measuring unit in the autonomous precoding mode is lower than the CQI value calculated by the base station based on the delivered PMI, or the difference between the two is less than If the predetermined fourth threshold is set, the UE is notified to terminate the autonomous precoding mode.

In addition, an uplink precoding transmitting device is also provided in an embodiment of the present invention, the device mainly includes an uplink precoding matrix estimation unit and an uplink precoding transmitting unit in a UE, wherein:

The uplink precoding matrix estimating unit is used to estimate the uplink precoding matrix in an autonomous uplink precoding mode according to the notification of the base station;

The uplink precoding transmitting unit is configured to use the uplink precoding matrix estimated by the uplink precoding matrix estimating unit to perform uplink precoding transmission.

Further, the uplink precoding matrix estimation unit is used for:

performing uplink precoding using an uplink precoding matrix corresponding to the PMI issued by the base station;

Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI issued by the base station, and uses the corrected uplink precoding matrix to perform uplink precoding;

Or, use the uplink precoding matrix corresponding to the PMI independently calculated by the UE to perform uplink precoding;

Alternatively, the uplink precoding is performed in a non-codebook manner.

Further, the device also includes:

An information reporting unit, configured to report PMI information to the base station according to a preset reporting strategy, where the PMI information includes: the PMI value calculated by the UE; or, the PMI value calculated by the UE and the PMI value issued by the base station different instructions;

Wherein, the preset reporting strategy includes: if the UE finds that the calculated PMI value is different from the PMI value issued by the base station, then report the calculated PMI information to the base station; or, the UE Periodically report the calculated PMI value to the base station.

Further, the device further includes an equivalent uplink channel estimation unit, wherein:

The equivalent uplink channel estimation unit is used to estimate downlink channel information according to the reference signal sent by the base station, and use the uplink channel information obtained by channel reciprocity;

The uplink precoding matrix estimating unit is configured to estimate an uplink precoding matrix according to the uplink channel information obtained by the equivalent uplink channel estimating unit.

Further, the uplink precoding matrix estimating unit is further configured to select a way of estimating the uplink precoding matrix according to the following instructions of the base station:

instructing the UE to select a codebook-based approach;

Or, instruct the UE to select a non-codebook mode;

Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner.

Further, the information reporting unit is further configured to feed back to the base station the PMI value actually used by the UE, or feed back to the base station the PMI value added on the basis of the uplink precoding matrix corresponding to the PMI issued by the base station. The correction amount is used to enable the base station to measure the effect of autonomous uplink precoding of the UE.

Further, as shown in FIG. 2, an uplink precoding transmission system is also provided in an embodiment of the present invention, and the system mainly includes the following units:

The information reporting unit 201 is used for the UE to report or feed back relevant information such as PMI information to the eNode B.

The uplink transmission mode notification unit 202 is used for the eNode B to notify the UE that the autonomous uplink precoding mode can be adopted.

The control signaling issuing unit 203 is configured for the eNode B to issue the control signaling to the UE.

The equivalent uplink channel estimation unit 204 is used for the UE to estimate the downlink channel according to the reference signal sent by the eNode B, so as to obtain the equivalent uplink channel.

The uplink precoding matrix estimating unit 205 is used for the UE to estimate the uplink precoding matrix according to the equivalent uplink channel. The precoding matrix may be a precoding matrix selected by the UE autonomously from the codebook to better match the channel, It may also be a beamforming matrix estimated according to the channel.

The uplink precoding transmitting unit 206, the UE uses the uplink precoding matrix to perform uplink precoding transmission.

The autonomous effect measuring unit 207 is configured to measure the effect of UE autonomous precoding.

In this embodiment, the autonomous effect measurement unit 207 is connected to the information reporting unit 201, and is used to use the PMI value actually used by the UE fed back after the UE adopts the autonomous precoding mode, or the precoding matrix actually used by the UE relative to the base station. The correction amount of the uplink precoding matrix corresponding to the transmitted PMI value and other information are used to measure the effect of UE autonomous precoding.

The above are only preferred implementation examples of the present invention, and are not intended to limit the present invention. The present invention can also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can Various corresponding changes and modifications are made in the present invention, but these corresponding changes and modifications should all belong to the protection scope of the appended claims of the present invention.

Obviously, those skilled in the art should understand that each unit or each step of the present invention described above can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out either separately as individual integrated circuit units, or as a plurality of units or steps among them as a single integrated circuit unit. As such, the present invention is not limited to any specific combination of hardware and software.

Claims (29)

1. A method for uplink precoding transmission, characterized in that the method comprises: When the base station judges that autonomous uplink precoding is allowed, the base station notifies the UE to perform uplink precoding transmission in an autonomous uplink precoding mode. 2. The method of claim 1, wherein The autonomous uplink precoding mode refers to: The UE uses the uplink precoding matrix corresponding to the PMI sent by the base station to perform uplink precoding; Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI delivered by the base station, and uses the corrected uplink precoding matrix to perform uplink precoding; Or, the UE performs uplink precoding using an uplink precoding matrix corresponding to the independently calculated PMI; Or, the UE performs uplink precoding in a non-codebook manner. 3. The method of claim 1, wherein, When the base station learns that the PMI value calculated by the UE is different from the PMI value calculated by the base station according to the precoding matrix indicator (PMI) information reported by the UE, it judges that the UE is allowed to perform autonomous uplink precoding. 4. The method of claim 2 or 3, wherein, When the base station learns that the UE is not currently in multi-user MIMO (MU-MIMO) mode according to the multiple-input multiple-output (MIMO) mode of the UE, it judges that the UE is allowed to perform autonomous uplink precoding, and the base station Do not schedule it in MU-MIMO mode for now. 5. The method of claim 1 or 2, wherein, While notifying the UE to adopt the autonomous uplink precoding mode, the base station also instructs the UE to estimate the uplink precoding matrix, including: instructing the UE to select a codebook-based approach; Or, instruct the UE to select a non-codebook mode; Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner. 6. The method of claim 1, wherein, The base station sends a reference signal for channel estimation to the UE while notifying the UE to adopt an autonomous uplink precoding mode; The reference signal used for channel estimation includes one or more of the following: downlink measurement reference signal (CSI-RS), cell-specific reference signal (Cell-Specific RS) or UE-specific reference signal (UE-Specific RS). 7. The method of claim 1, wherein, The base station notifies the UE to adopt the autonomous uplink precoding mode through control signaling. 8. The method of claim 1, further comprising: The base station measures the effect of autonomous uplink precoding of the UE, and decides whether to notify the UE to terminate the autonomous uplink precoding mode according to the measured effect. 9. The method of claim 8, wherein In the case of no open-loop link adaptation (OLLA), the base station judges whether to notify the UE to terminate the autonomous precoding mode according to the statistical block error rate (BLER) value, if the statistical BLER value is higher than the target BLER value, or the difference with the target BLER value is less than a predetermined first threshold value, then notify the UE to terminate the autonomous precoding mode; In the case of OLLA, the base station compares the CQI in autonomous precoding mode with the CQI value calculated by the base station based on the issued PMI, and if the CQI value in autonomous precoding mode is lower than the CQI value calculated by the base station , or the difference between the two is smaller than a predetermined second threshold, the UE is notified to terminate the autonomous precoding mode. 10. The method of claim 8, wherein, The base station calculates the difference between the PMI value actually used by the UE and the PMI value sent by the base station according to the PMI value actually used fed back by the UE, and if the difference is smaller than a predetermined third threshold value, Then notify the UE to terminate the autonomous precoding mode; Alternatively, the base station obtains the actually used precoding matrix according to the correction amount of the actually used precoding matrix fed back by the UE relative to the uplink precoding matrix corresponding to the PMI value issued by the base station, and calculates the autonomous precoding mode and compare it with the CQI value calculated by the base station based on the delivered PMI, if the calculated CQI value in the autonomous precoding mode is lower than the CQI value calculated by the base station based on the delivered PMI , or the difference between the two is smaller than a predetermined fourth threshold, the UE is notified to terminate the autonomous precoding mode. 11. A method for transmitting uplink precoding, characterized in that, The UE receives the notification from the base station, and uses the autonomous uplink precoding mode to perform uplink precoding transmission; Wherein, the autonomous uplink precoding mode refers to: the UE uses the uplink precoding matrix corresponding to the PMI delivered by the base station to perform uplink precoding; or, the UE uses the uplink precoding matrix corresponding to the PMI delivered by the base station; A correction amount is added to the precoding matrix, and the uplink precoding is performed using the revised uplink precoding matrix; or, the uplink precoding is performed using the uplink precoding matrix corresponding to the PMI independently calculated by the UE; or, the UE adopts Perform uplink precoding in a non-codebook manner. 12. The method according to claim 11, wherein the process of the uplink precoding transmission specifically comprises: The UE estimates downlink channel information according to the reference signal sent by the base station, and uses the uplink channel information obtained by channel reciprocity; The UE estimates an uplink precoding matrix according to the obtained uplink channel information, and uses the estimated uplink precoding matrix to perform uplink precoding transmission. 13. The method of claim 11, further comprising: The UE reports PMI information to the base station according to a preset reporting strategy, and the PMI information includes: The PMI value calculated by the UE; Or, an indication that the PMI value calculated by the UE is different from the PMI value delivered by the base station. 14. The method according to claim 13, wherein the preset reporting strategy comprises: If the UE finds that the calculated PMI value is different from the PMI value issued by the base station, report the calculated PMI information to the base station; Or, the UE periodically reports the calculated PMI value to the base station. 15. The method of claim 11, wherein, The UE selects a way to estimate the uplink precoding matrix according to the following instructions from the base station: instructing the UE to select a codebook-based approach; Or, instruct the UE to select a non-codebook mode; Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner. 16. The method of claim 11, further comprising: After the UE adopts the autonomous uplink precoding mode to perform uplink precoding transmission, it feeds back the PMI value actually used to the base station, or feeds back to the base station an uplink precoding matrix corresponding to the PMI issued by the base station. A correction amount of , so that the base station measures the effect of the UE autonomous uplink precoding. 17. An uplink precoding transmitting device, characterized in that the device includes an uplink transmission mode notification unit in a base station, wherein: The uplink transmission mode notification unit is used for judging whether UE autonomous uplink precoding is allowed, and notifying the UE to adopt autonomous uplink precoding mode for uplink precoding transmission when UE autonomous uplink precoding is allowed. 18. The apparatus of claim 17, wherein The uplink transmission mode notification unit is used to judge whether to allow UE autonomous uplink precoding in the following manner: According to the precoding matrix indicator (PMI) information reported by the UE, when it is known that the PMI value calculated by the UE is different from the PMI value calculated by the base station, determine that the UE is allowed to perform autonomous uplink precoding; And/or, according to the multiple-input multiple-output (MIMO) mode of the UE, when it is known that the UE is not currently in a multi-user MIMO (MU-MIMO) mode, it is judged that the UE is allowed to perform autonomous uplink precoding, and the The base station does not schedule it in MU-MIMO mode temporarily. 19. The apparatus of claim 17, wherein The uplink transmission mode notification unit is also configured to, while notifying the UE to adopt the autonomous uplink precoding mode, also instruct the UE to estimate the way of the uplink precoding matrix, including: instructing the UE to select a codebook-based approach; Or, instruct the UE to select a non-codebook mode; Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner. 20. The device according to claim 17, further comprising a reference signal sending unit, The reference signal sending unit is configured to send a reference signal for channel estimation to the UE; The reference signal used for channel estimation includes one or more of the following: CSI-RS, Cell-Specific RS or UE-Specific RS. 21. The device according to claim 17, further comprising a control signaling sending unit, The control signaling issuing unit is configured to notify the UE to adopt the autonomous uplink precoding mode by sending the control signaling to the UE. 22. The device according to claim 17, further comprising an autonomous effect measurement unit, The autonomous effect measuring unit is configured to measure the effect of the UE autonomous uplink precoding; The uplink transmission mode notifying unit is further configured to determine whether to notify the UE to terminate the autonomous uplink precoding mode according to the effect measured by the autonomous effect measuring unit. 23. The apparatus of claim 22, wherein The autonomous effect measurement unit is used to: in the case of no OLLA, count the BLER value; or, in the case of OLLA, compare the CQI in the autonomous precoding mode with the CQI value calculated by the base station based on the issued PMI comparison; or, according to the PMI value actually used fed back by the UE, calculate the difference between the PMI value actually used by the UE and the PMI value sent by the base station; or, according to the predicted PMI value actually used fed back by the UE The correction amount of the coding matrix relative to the precoding matrix corresponding to the PMI value issued by the base station is obtained to obtain the actually used precoding matrix, and the CQI value in the autonomous precoding mode is calculated and calculated based on the PMI issued by the base station. Compared with the CQI value out; The uplink transmission mode notification unit is configured to, in the case of no OLLA, if the BLER value counted by the autonomous effect measurement unit is higher than the target BLER value, or the difference between the target BLER value and the target BLER value is smaller than a predetermined first threshold value, notify the UE to terminate the autonomous precoding mode; or, in the case of OLLA, if the CQI value in the autonomous precoding mode is lower than the CQI value calculated by the base station, or the difference between the two is smaller than the predetermined second gate limit value, notify the UE to terminate the autonomous precoding mode; The UE terminates the autonomous precoding mode; or, if the CQI value calculated by the autonomous effect measuring unit in the autonomous precoding mode is lower than the CQI value calculated by the base station based on the delivered PMI, or the difference between the two is less than If the predetermined fourth threshold is set, the UE is notified to terminate the autonomous precoding mode. 24. An uplink precoding transmitting device, characterized in that the device includes an uplink precoding matrix estimation unit and an uplink precoding transmitting unit in the UE, wherein: The uplink precoding matrix estimating unit is used to estimate the uplink precoding matrix in an autonomous uplink precoding mode according to the notification of the base station; The uplink precoding transmitting unit is configured to use the uplink precoding matrix estimated by the uplink precoding matrix estimating unit to perform uplink precoding transmission. 25. The apparatus of claim 24, wherein The uplink precoding matrix estimation unit is used for: performing uplink precoding using an uplink precoding matrix corresponding to the PMI issued by the base station; Or, the UE adds a correction amount to the uplink precoding matrix corresponding to the PMI issued by the base station, and uses the corrected uplink precoding matrix to perform uplink precoding; Or, use the uplink precoding matrix corresponding to the PMI independently calculated by the UE to perform uplink precoding; Alternatively, the uplink precoding is performed in a non-codebook manner. 26. The device of claim 24, further comprising: An information reporting unit, configured to report PMI information to the base station according to a preset reporting strategy, where the PMI information includes: the PMI value calculated by the UE; or, the PMI value calculated by the UE and the PMI value issued by the base station different instructions; Wherein, the preset reporting strategy includes: if the UE finds that the calculated PMI value is different from the PMI value issued by the base station, then report the calculated PMI information to the base station; or, the UE Periodically report the calculated PMI value to the base station. 27. The device according to claim 24, further comprising an equivalent uplink channel estimation unit, wherein: The equivalent uplink channel estimation unit is used to estimate downlink channel information according to the reference signal sent by the base station, and use the uplink channel information obtained by channel reciprocity; The uplink precoding matrix estimating unit is configured to estimate an uplink precoding matrix according to the uplink channel information obtained by the equivalent uplink channel estimating unit. 28. The apparatus of claim 24, wherein The uplink precoding matrix estimating unit is further configured to select a way of estimating the uplink precoding matrix according to the following instructions of the base station: instructing the UE to select a codebook-based approach; Or, instruct the UE to select a non-codebook mode; Or, instruct the UE to select a codebook-based manner or a non-codebook-based manner. 29. The apparatus of claim 26, wherein The information reporting unit is further configured to feed back to the base station the PMI value actually used by the UE, or feed back to the base station the correction amount added on the basis of the uplink precoding matrix corresponding to the PMI issued by the base station, The base station measures the effect of autonomous uplink precoding of the UE.

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