CN104158626B - The method of sending and receiving and device of a kind of precoding information - Google Patents

Abstract

The invention discloses a kind of method of sending and receiving of precoding information and device, methods described includes：Terminal obtains broadband precoding instruction PMI；The MSB of broadband PMI described in the terminal-pair carries out information separately encoded or after being encoded the MSB of the broadband PMI and N-bit other information combined coding, wherein, MSB is a part of the broadband PMI, and N is natural number；The terminal sends the information after encoding to data sending terminal.Embodiments of the invention by the PMI of broadband MSB carry out it is separately encoded after and send or with N-bit other information carry out combined coding after and send, improve the reliability of broadband precoding information, reduce error propagation, so as to further increase the code performance that prelists.

Description

A method and device for sending and receiving precoded information

technical field

The present invention relates to the field of communication technology, in particular to a method and device for sending and receiving precoded information.

Background technique

With the continuous development of communication technology, in order to improve the performance of data transmission, the data sending end (such as NodeB (Node B), BS (Base station, base station), etc.) (Mobile Station, mobile station, etc.) Feedback precoding information (such as PMI (Precoding Matrix Indicator, precoding matrix indication) and the local pre-stored codebook, the data to be sent is preprocessed and then sent to the terminal, so that the data The transmission process adapts to the change of the channel state, thereby improving the performance of data transmission. Therefore, how to transmit and receive the above precoding information is very important.

The existing 3GPP LTE R8 (3rd Generation Partnership Project Long Term Evolution Release 8, 3rd Generation Partnership Project Long Term Evolution Release 8) system uses a single codebook, and its precoding matrix is indexed by a single PMI (precoding matrix indicator, precoding matrix indicator) , periodic and aperiodic reporting may be performed through PUCCH (Physical Uplink Control Channel, Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel) respectively.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

The wideband precoding matrix indicates that PMI is prone to error propagation. Therefore, it is necessary to further study the reporting mode in order to improve the system performance.

Contents of the invention

Embodiments of the present invention provide a method and device for sending and receiving precoding information, so as to improve system performance.

On the one hand, an embodiment of the present invention provides a method for sending precoding information, the method including:

The terminal obtains the wideband precoding indication PMI;

The terminal separately encodes the MSB of the broadband PMI or jointly encodes the MSB of the broadband PMI and N bits of other information to obtain encoded information, wherein the MSB is a part of the broadband PMI, and N is a natural number;

The terminal sends the coded information to the data sending end.

On the one hand, an embodiment of the present invention provides a method for receiving precoding information, the method including:

The data sender receives the encoded information sent by the terminal;

Wherein, the encoded information is: information obtained by separately encoding the MSB of the wideband PMI or jointly encoding the MSB of the wideband PMI and N bits of other information after the terminal obtains the wideband precoding indication PMI, wherein, the MSB is a part of the broadband PMI, and N is a natural number.

On the other hand, an embodiment of the present invention provides a device for sending precoding information, including:

an information acquisition unit, configured to acquire a wideband precoding indication PMI;

An information encoding unit, configured to separately encode the MSB of the wideband PMI or jointly encode the MSB of the wideband PMI and N bits of other information to obtain encoded information, wherein the MSB is a part of the wideband PMI, and N is Natural number;

The information sending unit is used to send the information encoded by the information encoding unit to the data sending end.

On the other hand, an embodiment of the present invention provides a device for receiving precoding information, including:

an information receiving unit, configured to receive encoded information sent by the terminal;

Wherein, the encoded information is: information obtained by separately encoding the MSB of the wideband PMI or jointly encoding the MSB of the wideband PMI and N bits of other information after the terminal obtains the wideband precoding indication PMI, wherein, the MSB is a part of the broadband PMI, and N is a natural number.

The embodiment provided by the embodiment of the present invention improves the reliability of the wideband precoding information and reduces error propagation by encoding the MSB in the wideband PMI separately and sending it or jointly encoding it with other N-bit information and sending it. The precoding performance is further improved.

Description of drawings

FIG. 1 is a schematic flowchart of a method for sending and receiving precoding information provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of resource mapping of coded information on PUSCH provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of resource mapping of another encoded information on PUSCH provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of another method for sending and receiving precoding information provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device for sending precoding information provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an apparatus for receiving precoding information provided by an embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to FIG. 1, an embodiment of the present invention provides a method for sending precoding information, the system bandwidth is divided into at least one subband, and the method includes:

101: The terminal obtains the broadband PMI;

Specifically, the terminal can acquire the broadband PMI according to preset criteria, and of course, can also acquire the broadband PMI according to other methods in the prior art; taking the terminal acquiring the broadband PMI according to the preset criteria as an example, the terminal can obtain the broadband PMI based on the preset criteria 1 Calculate the wideband precoding matrix to indicate PMI, specifically as shown in formula (1):

Where W _j represents a codeword in the single codebook C, and f ₁ (W _j ) represents the system bandwidth corresponding to preset criterion 1 and the objective function of the precoding matrix W _j . It should be noted that the above preset criterion 1 may be the throughput maximization criterion, and the objective function corresponding to the criterion may be the throughput maximization function, and the throughput maximization function may be realized based on information capacity calculation, or based on The realization of mutual information or the deformation of mutual information (such as the weighting of mutual information). The embodiment in which the preset criterion 1 is the capacity maximization criterion is similar to the above, and will not be repeated here. Of course, the objective function corresponding to the preset criterion can also be flexibly set according to the actual application situation, which is not specifically limited.

Or the terminal calculates the wideband precoding matrix indication PMI based on the preset criterion 2, specifically as shown in formula (2) (3):

in Represents a precoding matrix, which is two matrices with The function. matrix with They are indexed from two codebooks C1 and C2 through j _k,1 and j _k,2 respectively, which are used to represent the broadband characteristics and frequency selectivity characteristics of the channel respectively. Indicates the system bandwidth and wideband precoding matrix corresponding to preset criterion 2 the objective function of . f _s (i, W _j ) represents the objective function of subband i and precoding matrix W _j corresponding to preset criterion 2, and N _S is the total number of subbands constituting the system bandwidth. Here, j _k , ₁ is called a wideband precoding matrix indicator, that is, a wideband PMI.

It should be noted that the above preset criterion 2 may be a throughput maximization criterion, and the objective function corresponding to the criterion may be a throughput maximization function, and the throughput maximization function may be realized based on information capacity calculation, or based on The realization of mutual information or the deformation of mutual information (such as the weighting of mutual information). Of course, the objective function corresponding to the preset criterion can also be flexibly set according to the actual application situation, which is not specifically limited.

Further, after obtaining the broadband PMI, it may also include:

102: The terminal separately encodes the MSB (Most Significant bits, highest bit) of the broadband PMI;

Wherein, the MSB may be a part of the broadband PMI.

Specifically, the MSB (Most Significant Bits, the highest bit) of the broadband PMI obtained in step 101 is represented by a ₀ , a ₁ , a ₂ , a ₃ ,..., a _A-1 , where A is the MSB of the broadband PMI number of bits.

The MSB of the broadband PMI obtained in step 101 can be encoded by the terminal with a (20,A) code (refer to 3GPP LTETS36.212V9.0.0), where the codeword of the (20,A) code is a linear combination of 13 base sequences , the base sequence can be expressed as M _i,n , i=0,...,19; n=0,...,12, the specific M _i,n can be defined as in Table 5.2.3.3- in 3GPP LTE TS36.212V9.0.0 1. The encoded bits can be expressed as b ₀ , b ₁ , b ₂ , b ₃ ,...,b ₁₉ , where each bit can be expressed as

Of course, the encoding method can also be flexibly selected according to the actual application situation, which is not specifically limited.

In addition, it should be noted that the MSB of the wideband PMI may be a part of the wideband PMI, or may be all bits of the wideband PMI. When the MSB is a part of the wideband PMI, separately encoding and transmitting the MSB that is only a part of the wideband PMI saves overhead compared to separately encoding and transmitting the entire wideband PMI. And the MSB is the main component information of the PMI, even if the remaining PMI component information other than the MSB such as the LSB (Least Significant Bits) is not transmitted correctly, the impact on the system performance is relatively small.

103: The terminal sends the encoded information to the data sending end;

Specifically, the terminal may send the coded information to the data sending end through a physical uplink control channel PUCCH. Further, when the coded information is sent through the PUCCH, the same cycle as that of the rank indication (RI) may be used.

or

The terminal can send the coded information to the data transmitting end through the physical uplink shared channel PUSCH.

Further, the encoded information can be mapped to both sides of the PUSCH demodulation pilot or reference signal (Reference Signal, RS) through a channel interleaver, as shown in FIG. 2 or FIG. 3, S0 to S13 represent a sub- For SC-FDMA symbols in a frame, the position indicated by the MSB box is the position to which the coded information is mapped, and the RS box in the figure indicates the position to which the RS is mapped.

Further, when the PUSCH adopts MIMO (multiple input multiple output, multiple input multiple output) multi-layer transmission, the encoded information can be mapped to all layers for transmission.

104: The data sending end receives the encoded information sent by the terminal;

Specifically, the data sending end may receive the coded information sent by the terminal through a physical uplink control channel PUCCH.

or

Specifically, the data sending end may receive the coded information sent by the terminal through a physical uplink shared channel PUSCH.

Further, when the data sending end receives the coded information sent by the terminal through the physical uplink shared channel PUSCH, the coded information can be mapped to two channels close to the demodulation pilot or reference signal through the channel interleaver. side, receive at the position indicated by the MSB in Figure 2 or 3.

It should be further explained that there is a mapping relationship between the precoding indication PMI and the precoding matrix, and the mapping relationship makes the distance between the precoding matrices corresponding to the two PMIs with different highest MSBs larger than that between the two PMIs with different lowest LSBs. The distance between the precoding matrices corresponding to the PMI, which can be defined as the chord distance:

d _{A, B} ＝||A ^H B-BA ^H || _F (5)

Among them, d _{A, B} represent the chord distance of two matrices A and B, where matrix A has the same dimension as B, A ^H represents the conjugate transpose of matrix A, and ||□|| _F represents the Frobenius norm. Of course, the definition of the distance can also be flexibly defined according to the actual application situation, which is not specifically limited.

It should be noted that, the MSB of the foregoing wideband PMI may include a part of the wideband PMI, or may be all of the wideband PMI.

In addition, it should be noted that after obtaining the MSB of the wideband PMI, the data transmitting end can also obtain a reliable wideband or frequency selective precoding matrix together with wideband or frequency selective precoding information obtained through other feedback methods.

In the method for sending and receiving precoding information described in the embodiment of the present invention, by separately encoding and sending the MSB in the wideband PMI, the reliability of the wideband precoding information is improved, error propagation is reduced, and the precoding is further improved. performance.

Referring to FIG. 2, an embodiment of the present invention provides a method for sending precoding information, the system bandwidth is divided into at least one subband, and the method includes:

201: The terminal obtains the broadband PMI;

Specifically, the terminal can acquire the broadband PMI according to preset criteria, and of course, can also acquire the broadband PMI according to other methods in the prior art; taking the terminal acquiring the broadband PMI according to the preset criteria as an example, the terminal can obtain the broadband PMI based on the preset criteria 1 The PMI indicated by the wideband precoding matrix is calculated, specifically as shown in formula (1). Of course, the objective function corresponding to the preset criterion can also be flexibly set according to the actual application situation, which is not specifically limited.

Alternatively, the terminal calculates the wideband precoding matrix indicator PMI based on preset criterion 2, specifically as shown in formulas (2) (3). Of course, the objective function corresponding to the preset criterion can also be flexibly set according to the actual application situation, which is not specifically limited.

Further, after obtaining the broadband PMI, it may also include:

202: The terminal jointly codes the MSB of the wideband PMI and other information of N bits; wherein, the MSB is a part of the wideband PMI.

Specifically, the MSB (Most Significant Bits, the highest bit) of the broadband PMI obtained in step 201 is represented by A bits, and other information of N bits can be other bits except the MSB of the broadband PMI, such as rank indication RI , or may be hybrid automatic repeat request HARQ acknowledgment (ACK/NACK) information. The terminal combines the MSB of the wideband PMI and the N bits of other information into a bit sequence with a length of A+N.

Further, the terminal codes the bit sequence with a length of A+N through a (20, A+N) code, and the code may be coded similarly to the embodiment shown in FIG. 1 .

Of course, the encoding method can also be flexibly selected according to the actual application situation, which is not specifically limited.

In addition, it should be noted that the MSB of the wideband PMI may be a part of the wideband PMI, or may be all bits of the wideband PMI.

203: The terminal sends the encoded information to the data sending end;

Specifically, the terminal may send the coded information to the data sending end through a physical uplink control channel PUCCH. Further, when the coded information is sent through the PUCCH, the same cycle as that of the rank indication (RI) may be used.

or

The terminal can send the coded information to the data transmitting end through the physical uplink shared channel PUSCH.

Further, the encoded information can be mapped to both sides of the PUSCH demodulation pilot or reference signal (Reference Signal, RS) through a channel interleaver, as shown in FIG. 2 or FIG. 3, S0 to S13 represent a sub- For SC-FDMA symbols in a frame, the position indicated by the MSB box is the position to which the coded information is mapped, and the RS box in the figure indicates the position to which the RS is mapped.

Further, when the PUSCH adopts MIMO (multiple input multiple output, multiple input multiple output) multi-layer transmission, the encoded information can be mapped to all layers for transmission.

204: The data sender receives the encoded information sent by the terminal

Specifically, the data sending end may receive the coded information sent by the terminal through a physical uplink control channel PUCCH.

or

Specifically, the data sending end may receive the coded information sent by the terminal through a physical uplink shared channel PUSCH.

Further, when the data sending end receives the coded information sent by the terminal through the physical uplink shared channel PUSCH, the coded information can be mapped to two channels close to the demodulation pilot or reference signal through the channel interleaver. side, receive at the position indicated by the MSB in Figure 2 or Figure 3.

It should be further explained that there is a mapping relationship between the precoding indication PMI and the precoding matrix, and the mapping relationship makes the distance between the precoding matrices corresponding to the two PMIs with different highest MSBs larger than that between the two PMIs with different lowest LSBs. The distance between the precoding matrices corresponding to the PMI can be defined as a chord distance, specifically as shown in formula (5). Of course, the definition of the distance can also be flexibly defined according to the actual application situation, which is not specifically limited.

It should be noted that, the MSB of the foregoing wideband PMI may include a part of the wideband PMI, or may be all of the wideband PMI.

In addition, it should be noted that after obtaining the MSB of the wideband PMI, the data transmitting end can also obtain a reliable wideband or frequency selective precoding matrix together with wideband or frequency selective precoding information obtained through other feedback methods.

The method for sending and receiving precoding information described in the embodiment of the present invention improves the reliability of the wideband precoding information and reduces error propagation by jointly encoding and sending the MSB and N-bit other information in the wideband PMI. The precoding performance is further improved.

Referring to Fig. 5, corresponding to the above-mentioned method embodiment, an embodiment of the present invention provides a device for sending precoding information, which is suitable for a system in which the bandwidth is divided into at least one subband, and the device includes:

An information acquiring unit 301, configured to acquire a wideband precoding indication PMI;

Specifically, the terminal can acquire the broadband PMI according to preset criteria, and of course, can also acquire the broadband PMI according to other methods in the prior art; taking the terminal acquiring the broadband PMI according to the preset criteria as an example, the information acquisition unit is based on the preset Criterion 1 calculates the wideband precoding matrix indicator PMI, specifically as shown in formula (1).

Or the information acquiring unit calculates the wideband precoding matrix indicator PMI based on preset criterion 2, specifically as shown in formulas (2) (3).

Of course, the objective function corresponding to the preset criterion can also be flexibly set according to the actual application situation, which is not specifically limited.

The information encoding unit 302 is configured to separately encode the MSB of the wideband PMI or jointly encode the MSB of the wideband PMI and N bits of other information to obtain encoded information, where the MSB is a part of the wideband PMI, and N is a natural number;

The information sending unit 303 is configured to send the information encoded by the information encoding unit to the data sending end.

Wherein, the device for sending the precoding information in the embodiment of the present invention may specifically be a terminal.

The device for transmitting precoding information described in the embodiment of the present invention improves the reliability of the wideband precoding information by encoding the MSB in the wideband PMI separately and then transmitting it or jointly encoding it with other information of N bits and then transmitting it. Error propagation is reduced, which further improves precoding performance.

Referring to Fig. 6, corresponding to the above-mentioned method embodiment, an embodiment of the present invention provides a device for receiving precoding information, which is suitable for a system in which the bandwidth is divided into at least one subband, and the device includes:

The information receiving unit 601 is configured to receive encoded information sent by the terminal. Wherein, the encoded information is: information obtained by separately encoding the MSB of the wideband PMI or jointly encoding the MSB of the wideband PMI and N bits of other information after the terminal obtains the wideband precoding indication PMI, wherein, the MSB is a part of the broadband PMI, and N is a natural number.

The device for receiving precoding information described in the embodiment of the present invention improves the wideband precoding information by receiving the information sent by the terminal after encoding the MSB in the broadband PMI separately or jointly encoding and sending the information with N bits of other information. The reliability of the encoded information reduces error propagation, thereby further improving the precoding performance.

The data sending end in the foregoing embodiments may be NodeB (Node B), BS (Base station, base station), home base station, or relay station, etc., and the terminal in the foregoing embodiments may be UE (User Equipment, user equipment), MS (Mobile Station , mobile station).

All or part of the technical solutions provided by the above embodiments can be realized by software programming, and the software program is stored in a readable storage medium, such as a hard disk, an optical disk or a floppy disk in a computer.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (15)

1. a kind of sending method of precoding information, it is characterised in that methods described includes：

Terminal obtains broadband precoding instruction PMI；

The terminal by a part of the broadband PMI and N-bit order instruction RI combined codings, wherein, the one of the broadband PMI Part includes the MSB of the broadband PMI, and lowest order LSB, N including the broadband PMI are not natural number；

The terminal sends the information after encoding to data sending terminal.

2. according to the method for claim 1, it is characterised in that

The terminal sends the information after encoding to data sending terminal, is specially：The terminal passes through Physical Uplink Control Channel PUCCH sends the information after the coding by Physical Uplink Shared Channel PUSCH.

3. according to the method for claim 2, it is characterised in that

In the information after the terminal sends the coding by Physical Uplink Shared Channel PUSCH, the letter after the coding Breath is mapped to the both sides close to demodulation pilot tone or reference signal by channel interleaver.

4. according to the method for claim 1, it is characterised in that：Precoding, which indicates to exist between PMI and pre-coding matrix, reflects Relation is penetrated, the mapping relations cause the distance between pre-coding matrix corresponding to two different PMI of highest order MSB to be more than most The distance between pre-coding matrix corresponding to two different low level LSB PMI.

5. according to the method for claim 2, when PUSCH uses multiple-input and multiple-output MIMO multilayer transmissions, the coding Information MAP afterwards is to transmitting on all layers.

6. a kind of method of reseptance of precoding information, it is characterised in that methods described includes：

Information after the coding that data sending terminal receiving terminal is sent；

Wherein, the information after the coding is：A broadband PMI part and N-bit order instruction RI combined codings, wherein, it is described A broadband PMI part includes the MSB of the broadband PMI, and lowest order LSB, N including the broadband PMI are not natural number.

7. according to the method for claim 6, it is characterised in that：

Information after the coding that data sending terminal receiving terminal is sent, is specifically included：The data sending terminal passes through physical uplink Control channel PUCCH passes through Physical Uplink Shared Channel PUSCH and receives the information after the coding that the terminal is sent.

8. according to the method for claim 7, it is characterised in that：

Information after the data sending terminal receives the coding of the terminal transmission by Physical Uplink Shared Channel PUSCH When, the information after the coding is mapped to the both sides close to demodulation pilot tone or reference signal by channel interleaver.

9. according to the method for claim 6, it is characterised in that：Precoding, which indicates to exist between PMI and pre-coding matrix, reflects Relation is penetrated, the mapping relations cause the distance between pre-coding matrix corresponding to two different PMI of highest order MSB to be more than most The distance between pre-coding matrix corresponding to two different low level LSB PMI.

A kind of 10. dispensing device of precoding information, it is characterised in that including：

Information acquisition unit, for obtaining broadband precoding instruction PMI；

Information coding unit, for by a part of the broadband PMI and N-bit order instruction RI combined codings, wherein, the width A part with PMI includes the MSB of the broadband PMI, and lowest order LSB, N including the broadband PMI are not natural number；

Information transmitting unit, for sending the information after described information coding unit coding to data sending terminal.

11. device according to claim 10, it is characterised in that

Described information transmitting element, is specifically used for：By Physical Uplink Control Channel PUCCH or pass through Physical Uplink Shared Channel PUSCH sends the information after the coding.

12. device according to claim 11, it is characterised in that

When the information after the coding is sent by Physical Uplink Shared Channel PUSCH, the information after the coding passes through channel Interleaver is mapped to the both sides close to demodulation pilot tone or reference signal.

A kind of 13. reception device of precoding information, it is characterised in that including：

Information receiving unit, for the information after the coding of receiving terminal transmission；

Wherein, the information after the coding is：A broadband PMI part and N-bit order instruction RI combined codings, wherein, it is described A broadband PMI part includes the MSB of the broadband PMI, and lowest order LSB, N including the broadband PMI are not natural number.

14. device according to claim 13, it is characterised in that：

Described information receiving unit, is specifically used for：By Physical Uplink Control Channel PUCCH or pass through Physical Uplink Shared Channel PUSCH receives the information after the coding that the terminal is sent.

15. device according to claim 14, it is characterised in that：

When the information after the coding of the terminal transmission is received by the Physical Uplink Shared Channel PUSCH, after the coding Information by channel interleaver be mapped to close to demodulation pilot tone or reference signal both sides.