WO2012071887A1

WO2012071887A1 - Method and mobile terminal for feeding back channel information coding

Info

Publication number: WO2012071887A1
Application number: PCT/CN2011/076459
Authority: WO
Inventors: 徐俊; 杨勋; 陈艺戬; 李儒岳
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-29
Filing date: 2011-06-28
Publication date: 2012-06-07
Also published as: CN102025450B; CN102025450A

Abstract

A method and mobile terminal for feeding back channel information coding. The method includes: combining a Precoder Type Instruction (PTI) and a Rank Instruction (RI) into a feedback report by a mobile terminal, and setting the PTI before a sequence for indicating the RI; encoding the feedback report in linear block code to obtain a code word sequence of the encoded feedback report; feeding the code word sequence back to a base station by the mobile terminal. The present invention can improve the performance of channel information feedback

Description

Method for performing channel information coding feedback and mobile terminal

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method for performing channel information coding feedback and a mobile terminal.

Background technique

In wireless communication, if multiple antennas are used by both the transmitting end and the receiving end, spatial multiplexing can be used to obtain a higher rate. Compared with the general spatial multiplexing method, an enhanced technology includes: the receiving end feeds back the channel information of the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel information to improve the transmission performance. The simpler method is to pre-code the channel feature vector information directly. This method is mainly used in single-user Multiple-Input Multiple-Output (MIMO), and other better but more complicated methods. Mainly used in multi-user MIMO. Both methods require more accurate channel information.

In Long Term Evolution (LTE), the feedback of channel information mainly utilizes a simple single codebook feedback method, and the performance of MIMO transmit precoding technology mainly depends on the accuracy of codebook feedback.

The basic principle of quantizing feedback of channel information based on codebook is briefly described as follows.

Assuming that the limited feedback channel capacity is B bps/Hz, then the number of available codewords is N=2 ^B. The eigenvector spaces of the matrix are quantized to form the codeword space CB = ^ , w ₂ , ... , M }. The transmitter and the receiver jointly save or generate the codebook in real time (same as the transceiver). The receiving end selects a codeword that best matches the channel from the CB according to a certain criterion and feeds back the codeword sequence number back to the transmitting end. Here, the code word number is called a Precoding Matrix Indicator (PMI). The transmitting end finds the corresponding precoding codeword according to the sequence number to obtain channel information, and ^ represents the feature vector information of the channel.

Since the eigenvector structure of the channel matrix H is different, the CB can be further divided into codebooks corresponding to a plurality of ranks (layers), and each rank corresponds to a plurality of codewords to quantize the channel eigenvectors under the rank. Precoding matrix. The rank of the channel and the number of eigenvectors corresponding to the larger eigenvalues of the channel matrix H are equal. Therefore, in general, the codewords with the rank of time have columns. Taking LTE Rel.8 as an example, the codebook CB can be divided into four subcodebooks CB(1), CB(2), CB(3), and CB(4) according to the rank, as shown in Table 1. Each codebook has 16 code words.

Table 1 LTE Rel.8 codebooks according to different ranks

The codebook of rank 1 in Table 1 is

CB(r) = {« . · -w[ ₅ } Equation 1 The Long Term Evolution Advanced (LTE-A), which continues to evolve as LTE, needs to support larger system bandwidth (up to 100MHz). In addition, LTE-A needs to enhance the related technologies, such as increasing the transmit antenna port of MIMO from 4 antennas to 8 antennas. This requires designing an 8-antenna MIMO codebook. The vector space of the MIMO 8-antenna codebook is more complex and requires higher precision. Thus, the feedback amount of the 8-antenna codebook is increased relative to the 4-antenna codebook feedback amount at Rel. In order to further reduce the overhead while ensuring the 8-antenna MIMO performance, LTE-A gives the design principle of the 8-antenna MIMO codebook:

1) The precoding/feedback structure of a subband consists of two matrices. As shown in Table 2, each rank r has two codebooks CBj (r) and CB ₂ (r), which can be expressed as Equations 2 and 3.

Table 2 LTE Rel.10 8 antenna double codebook big d, design Rank r CBj size CB ^ size equivalent codebook size

1 16 16 256

2 16 16 256

3 4 16 64

4 4 8 32

5 4 1 4

6 4 1 4

7 4 1 4

8 1 1 1

CB, (r) = { ¹ , ¹ , ...,^;, ₁ }

CB ₂ (r) = {« , ₂ } Equation 3 Here, the first codeword matrix representing the codebook CB r) represents the first codeword matrix of the codebook CB ₂ (r). And N ^r ' ² represent the size of the codebook (r) and the codebook CB ₂ (r ), respectively.

When User Equipment (UE) (commonly referred to as UE) feeds back precoding, the sequence number of the codeword matrix selected from the two codebooks is used as the precoding matrix to instruct PMI1 and PMI2 to feed back. In the LTE standard, the minimum feedback unit of channel information is a subband (Subband). A subband is composed of a number of resource blocks (RBs). Each RB is composed of a plurality of resource elements (REs), which are the smallest units of time-frequency resources in LTE, and LTE-A uses LTE. Resource representation method. The precoding structure refers to the precoding recommended by the UE to the base station, and is actually a representation method of the channel information.

2) This precoding/feedback structure can be applied to all transmit antenna array configurations.

3) Each of the two matrices belongs to a separate codebook. The codebook is known in advance by the base station and the UE. Codebooks can vary at different times and on different subbands.

4) A matrix represents the properties of a wideband or long-term channel. Another matrix represents the properties of the determined frequency band or short-term channel. As shown, for rank r determined, selected out of the codebook CB r) matrix of f ^ ¹ denotes wideband or long-term channel properties in Table 2, and selected out of the codebook CB ₂ (r) matrix representation determined band The properties of the upper or short channel. In this way, every band or short time Equivalent precoding matrix ^ = /(^, ^7). _{^{1≤ ≤ N, \ ≤j≤N r 2}} , i, · that is fed back to the base station UE PMI1 and PMI2. Wherein, k = ixj, N denotes the codebook CB size rank r ₂ (r), showing the size of the codebook CB ₂ (r) at the rank r, l≤r≤8.

5) Rel.8 precoding feedback can be regarded as a special form of this structure, that is, the codebook of the existing Rel.8 can be regarded as the codebook CB ₂ , and the number of CB codebooks is regarded as 1, that is, the rank The codebook CB under r has only one unit matrix /, l ≤ r ≤ 4.

The design principles described above, in the 8-antenna MIMO codebook design, it is necessary to codebooks CB, and CB ₂ placed in both the UE and the base station side. After the UE acquires the channel information, the appropriate codewords ^ and ^ are respectively selected from the CB and the CB ₂ , and the PMI1 and PMI2 of the ^ and ^ and the corresponding Rank Indication (RI) information, and at most Two CQI information.

Therefore, the problem to be solved is how to upload the two PMIs, one RI, and two CQI information obtained by the UE in the 8-antenna configuration scenario to the base station under a limited overhead. The solution to this problem by LTE Rel.lO is mainly based on the existing channel information feedback mode of Rel.8. Among them, the Rel.lO 8 antenna PUCCH 2-1 mode proposed based on the Rel.8 PUCCH 2-1 feedback mode is a more effective method.

The Rel.lO PUCCH 2-1 mode uses Precoder Type Indication (PTI) to achieve the purpose of reducing overhead and transmitting broadband and subband information at intervals. The report structure of Rel.lO PUCCH 2-1 mode feedback information uses the following four kinds of feedback reports: RI+PTL PMI1, wideband CQI+broadband PMI2, subband CQI+subband PMI2; that is, RI and PTI are combined in one subframe. Transmission, PMI1 is separately transmitted in one subframe, wideband CQI and wideband PMI2 are jointly transmitted in one subframe, and subband CQI and subband PMI2 are jointly transmitted in one subframe.

When the scenario is an 8-antenna configuration, the PUCCH 2-1 of the Rel.10 indicates that the base station knows whether the UE currently feeds back long-term information or short-term information by setting the PTI, as shown in Table 3. When PTI=0, PUCCH 2-1 feeds back long-term information, including the following three kinds of feedback reports: RI+PTK Report 1), PMI1 (Report 2), broadband CQI+Broadband PMI2 (Report 3). When PTI=1, PUCCH 2-1 feeds back short-term information, including the following three kinds of feedback reports: RI+PTI (Report 1), wideband CQI+wideband PMI2 (Report 2), subband CQI+subband PMI2 (Report 3 ).

Table 3 Feedback design of PUCCH 2-1 in base station 8 antenna configuration in LTE Rel.lO Report 1 RI+PTI RI+PTI

Report 2 Wl Broadband CQI+Broadband W2

Report 3 Broadband CQI+Broadband W2 Subband CQI+Subband W2 When the base station is configured for 4 antennas and 2 antennas, since PMI1 is determined to be 1, it is not necessary to set PTI=0. Therefore, when the scene is configured for 4 antennas and 2 antennas, ΡΤΙ=1.

Due to channel noise interference, the base station may also have problems when it receives correct RI errors. The corresponding analysis is given here. The following is an example of PMI1 feedback, and the same situation will occur in ΡΜΙ2 feedback.

The PMI1 fed back by the UE is a certain matrix number in the codebook CB rJ of the rank. When the base station judges the rank ^ error as r ₂ , where r _{1 ≠} r ₂ , the base station considers that PMI1 is the codebook CB rJ of the rank r ₂ . A matrix number in . At this time, the following situation may theoretically occur.

1) If the value of PMI1 exceeds the size of the codebook CB rJ of rank r ₂ at this time, a valid precoding matrix cannot be retrieved.

2) If the codeword matrix dimensions in CB rJ and CB rJ are not the same, even if the value of PMI1 does not exceed the size of the codebook CB rJ of the rank r ₂ , the retrieved precoding matrix cannot be used.

For example, in an 8 x 2 typical scenario (base station configuration 8 antennas, UE configuration 2 antennas), RI has only two options RI=1 or RI=2. However, whether RI=1 is erroneously judged as RI=2 or RI=2 is incorrectly judged as RI=1. As can be seen from Table 3, the size of the codebook CB when RI=1 and RI=2 is exactly the same, and there is no RI. After the misjudgment, the PMI is used to retrieve the corresponding codebook and the codeword matrix is not obtained.

In the 8 x 4 scene (8 antennas for the base station and 4 antennas for the UE), the RI has only 4 options RI=1, RI=2, RI=3, and RI=4. At this time, in addition to the case where RI=1 is misjudged as RI=2 and RI=2, and RI=1 is misjudged, RI=1 may be misjudged as RI=3, and RI=3 is misjudged as RI=4 and so on. The misjudgment between RI=1 and 2 is the same as the 8 x 2 scenario discussed above. Otherwise, the situation may be different due to the different size of CB ₂ under different ranks, which may cause PMI based on feedback. The result of the corresponding codeword matrix is not retrieved. At this time, the decoding fails, and the current feedback channel information cannot be used.

When the RI is 3 or 4 and the RI is 1, 2, the dimension of the W1 codeword matrix is different, which also affects the normal use of channel information. Since RI errors can result in system performance degradation or even the inability to use current feedback information, the prior art generally considers RI information to be more important than other channel information. Therefore, it is generally considered to separately place the RI in one subframe for transmission to reduce the bit error rate. If there is a case where RI and other information (such as a PMI bit or a binary sequence of PMI1) are jointly transmitted in one subframe, the following two measures are used:

1) The overhead of defining RI and other information, that is, the number of input sequence bits before encoding is less than or equal to 5 bits, because in the case where the output codeword sequence is determined after encoding, the number of bits of the input sequence before encoding is smaller, and the sequence of the encoded sequence is The greater the information redundancy, the stronger the ability to resist noise and noise interference. 5 bits are the extensive experience of wide acceptance.

2) The binary sequence representing the RI is placed before the binary sequence representing other information before encoding. Since the first column of the linear block code used for encoding is an all-one sequence, the bit information at the top of the input sequence can be loaded on the all-one sequence, resulting in better protection.

In the design of Rel.10 PUCCH 2-1, ΡΉ and RI form a feedback report, that is, PTI and RI are coded and transmitted in one subframe. When a base station uses an 8-antenna configuration, the importance of PTI is greater than the importance of RI. The above-mentioned second measure of general technical use does not apply to the need to feedback feedback from ΡΉ and RI in Rel.10 PUCCH 2-1.

Summary of the invention

When the base station uses an 8-antenna configuration, the indication of PTI in PUCCH 2-1 is very important. If the base station decodes the feedback information and obtains the wrong PTI due to factors such as channel noise interference, the following serious consequences are caused.

1) Report 2 information cannot be solved. It can be seen from Table 3 that because the information content and type of Report 2 with PTI=0 and ΡΤΙ=1 are completely different, Report 2 cannot be solved, which requires the UE to retransmit the information to the base station.

2) The subsequent channel information cannot be judged. If the feedback period of PTI=0 and PTI=1 is different, 判断 Judgment error will make it impossible to judge where the beginning of the feedback sequence of the next PUCCH 2-1 is, and the next channel information cannot be decoded.

However, the RI's judgment error is at most such that the channel information is not used, and it is not like awkward Judgment errors are likely to cause decoding errors in the next few channel information. Moreover, since the 8 x 2 configuration is the most common configuration in the 8-antenna scenario, the RI's judgment error does not make the current channel information unavailable. In another common 8-antenna scene 8 x 4 configuration, the probability of occurrence of RI=1 and RI=2 is higher than RI=3 and RI=4. Therefore, the probability that the RI judgment error causes the channel information to be unavailable is not high.

On the one hand, the RI's judgment error leads to a low probability that the channel information will not be used. On the other hand, even if the channel information is not used, the next channel information usage will not be affected. On the one hand, the PTI judgment error will cause the channel to be completely unusable, and if the feedback periods of PTI=0 and ΡΤΙ=1 are different, it will be impossible to judge the starting position of the next channel information, resulting in the next few times. Channel information is also not available.

From the above analysis, one can draw a conclusion: It is more important than RI. Therefore, in Re-10 PUCCH 2-1, the feedback report including PTI and RI needs to adjust the coding strategy, and the idea of focusing on protecting RI is transformed into the idea of protecting PTI.

The technical problem to be solved by the present invention is to provide a method for performing channel information coding feedback and a mobile terminal, which improves the performance of channel information feedback.

In order to solve the above technical problem, an embodiment of the present invention provides a method for performing channel information coding feedback, including: a mobile terminal combining a precoder type indication (PTI) and a rank indication (RI) into a feedback report, and setting a PTI Before the sequence indicating the RI; encoding the linear block code of the feedback report to obtain the codeword sequence encoded by the feedback; the mobile terminal feeds back the codeword sequence to the base station.

Preferably, the above method may also have the following features:

The feedback report in turn includes one PTI binary bit and one binary sequence representing RI.

Preferably, the above method may also have the following features:

When the number of receiving antenna ports configured by the mobile terminal is two, the feedback report includes one

The binary bit of the PTI and the 1 bit represent the binary sequence of the RI; when the mobile terminal is configured with four receiving antenna ports, the feedback report includes one PTI binary bit and two bits of the binary sequence representing the RI. When the mobile terminal is configured with eight receiving antenna ports, The joint to-be-coded sequence includes a binary bit of 1 PTI and a 3-bit binary sequence representing RI.

In order to solve the above technical problem, an embodiment of the present invention further provides a mobile terminal that performs channel information coding feedback, where the mobile terminal is configured to: combine a precoder type indication (PTI) and a rank indication (RI) into one feedback. Reporting, the PTI is set before the sequence indicating the RI; and the feedback report is encoded by a linear block code to obtain a codeword sequence encoded by the feedback report; and the codeword sequence is fed back to the base station.

Preferably, the foregoing mobile terminal may further have the following features:

When the number of receiving antenna ports configured by the mobile terminal is two, the feedback report includes a binary bit of one PTI and a binary sequence of one bit indicating RI; when the receiving antenna port configured by the mobile terminal is four The feedback report includes a binary bit of 1 PTI and a binary sequence of 2 bits representing RI. When the receiving antenna port configured by the mobile terminal is 8, the joint to-be-coded sequence includes a PTI binary. The bit and the 3-bit binary sequence representing the RI.

The technical problem to be solved by the present invention is to provide a method for setting a feedback report and a mobile terminal to improve the performance of channel information feedback.

In order to solve the above technical problem, an embodiment of the present invention further provides a method for setting a feedback report, including: a mobile terminal combining a precoder type indication (PTI) and a rank indication (RI) into a feedback report, and setting the PTI to Indicates the RI's binary sequence before.

Preferably, the above method may also have the following features:

In order to solve the above technical problem, an embodiment of the present invention further provides a mobile terminal that sets a feedback report, where the mobile terminal is configured to: combine a precoder type indication (PTI) and a rank indication (RI) into a feedback report, The PTI is set before the binary sequence representing the RI. Preferably, the foregoing mobile terminal may further have the following features:

The embodiments of the present invention can improve the performance of channel information feedback. BRIEF abstract

1 is a schematic diagram of a method for setting a feedback report in an embodiment;

2 is a schematic diagram of a method for performing feedback report coding feedback. Preferred embodiment of the invention

The present invention is directed to the analysis result of the RI and the ΡΉ formation feedback of the downlink MIMO 8 antenna PUCCH 2-1, which is more important than the RI, and proposes a scheme for improving the degree of protection of the PTI.

The mobile terminal performing channel information feedback is configured to combine a precoder type indication (PTI) and a rank indication (RI) into one feedback report, and set the PTI before the sequence indicating the RI; performing linear block code on the feedback report Encoding, obtaining a codeword sequence encoded by the feedback report; feeding the codeword sequence to a base station.

The mobile terminal that sets the feedback report is used to combine the precoder type indication (PTI) and the rank indication (RI) into one feedback report, and set the PTI before the binary sequence representing the RI.

As shown in FIG. 1, the present invention provides a method for setting a feedback report, including: a mobile terminal combining a precoder type indication (PTI) and a rank indication (RI) into a feedback report, and setting a PTI Before the binary sequence representing the RI.

The feedback report includes a binary bit of 1 PTI and a binary sequence representing RI.

As shown in FIG. 2, the present invention further provides a method for performing channel information feedback, including: a mobile terminal combining a precoder type indication (PTI) and a rank indication (RI) into one feedback report, and setting a PTI to represent an RI Before the sequence; encoding the linear block code of the feedback report to obtain a codeword sequence encoded by the feedback report; the mobile terminal feeds back the codeword sequence to the base station.

The method of performing channel information feedback is described in detail below:

Pre-stored in the base station and the UE (N, linear packet code base sequence e., _ei , ..., _eAM . is a length of 々 binary ll vector, 0 ≤ / < N- l , N > 8 , L > %.

Step 1: The UE sets the value of ΡΉ according to the high-level signaling indication or according to the existing feedback period relationship; .

Step 2: The UE determines whether to calculate the RI according to the value p of the PTI. If p = 0, the current channel is measured. Calculate the RI. If p = l, take the RI of the last feedback as the RI of the current feedback. If / ≠0 and / ≠1, the exception handling flow is entered. Here, the value of RI is represented by the variable r.

Step 3: Calculate the binary sequence representing PTI and RI separately. And ^^,... . .

KG {1, 2, 3}. Where a _Q e {0,1}; 3⁄4 G {0,1} , 0 < / <^-1; p = a ₀ r = ^ +1. Step 4: Calculate the inclusion? ! ! with! ^ Feedback report..., ^. This feedback report is a binary sequence. Here, c ₀ = a ₀ , c _t = b _K _ _t , \ ≤ i ≤ K.

Step 5: According to the following formula, the binary sequence c. , encode to get 4, ..·, — =∑( ^C A (·')) ^{mod 2} where is a binary vector of length J. . ( ) indicates the vector + element. \≤i≤N, 0≤ ≤1. Jcmod2 indicates that the JC pair 2 is reserved. When j3⁄4, = + 1.

Step 6: The UE loads the encoded sequence after the encoding is determined on the subframe to transmit the feedback to the base station. Several embodiments of the invention are given below.

Specific embodiment 1

It is known that the base station is configured with eight transmit antenna ports, and the UE end is configured with two receive antenna ports. A (20, Α) linear block code base sequence β is prestored simultaneously in the base station side and the UE side. , ί .·, , as shown in Table 4. e _t is a binary vector of length 20, 0 ≤ ≤ 12. A is determined by the number of input sequence bits that need to be encoded.

Table 4 (20, A) base sequence of linear block codes

Step 101: The UE sets the PTI value P = l according to the high layer signaling indication or according to the existing feedback period relationship, that is, the content of the feedback is determined.

Step 102: Because the value of ΡΉ p = 1, according to the format of Rel.lO PUCCH 2-1, the UE takes the rank RI of the feedback once as the current rank RI. Here, the value of RI is represented by the variable r. Re{l, 2}.

Step 103: Calculate the binary representation sequence of the RI. Satisfies = + 1 and ^{0,1}.

Step 104: Generate feedback of PTI and RI. The report is binary sequence 1, .

Step 105: Calculate the coding sequence according to the following formula. = ( ^e o(X '》 ^mod2

Here is a binary vector of length 20. Represents vector + + 1 element. 1</<12, 0≤ ≤19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=2 at this time.

Step 106: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station.

Specific embodiment 2

It is known that the base station is configured with eight transmit antenna ports, and the UE end is configured with two receive antenna ports. A (20, A) linear block code base sequence β is prestored simultaneously in the base station side and the UE side. , ί .·, , as shown in Table 4. e _t is a binary vector of length 20, 0 ≤ ≤ 12. A is determined by the number of input sequence bits that need to be encoded.

Step 201: The UE sets the value of the PTI ρ = 0 according to the high layer signaling indication or according to the existing feedback period relationship, that is, the content of the feedback is determined.

Step 202: Because the value of ΡΤΙ ρ = 0, according to the format of Rel.10 PUCCH 2-1, the UE measures the channel and calculates a new RI. Here, the value of RI is represented by the variable r. Re{l, 2}.

Step 203: Calculate a binary representation sequence of the RI. Satisfies = + 1 and ^{0,1}.

Step 204: Generate a feedback of the PTI and the RI, that is, the binary sequence 0, b ₀ .

Step 205: Calculate the coding sequence according to the following formula. = ( ^e o(X '》 ^mod2

Here is a binary vector of length 20. (·) indicates the vector · + 1 element.

1</<12, 0≤ ≤19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=2 at this time.

Step 206: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station.

Concrete embodiment 3

It is known that the base station is configured with 8 transmit antenna ports, and the UE end is configured with 4 receive antenna ports. A (20, A) linear block code base sequence β is prestored simultaneously in the base station side and the UE side. , ί .·, , as shown in Table 4. e _t is a binary vector of length 20, 0 ≤ ≤ 12. A is determined by the number of input sequence bits that need to be encoded.

Step 301: The UE sets the value of the PTI according to the high layer signaling indication or according to the existing feedback period relationship, that is, the content of the feedback is determined.

Step 302: The UE takes the rank RI of the last feedback as the current rank RI according to the value of the PTI p=1. Here, the variable r is used to represent the value of RI, {l, 2, 3, 4}.

Step 303: Calculate the binary representation sequence of RI to satisfy r = 2 + + l and , ^{0, 1}. Step 304: Generate a feedback sequence of PTI and RI, that is, a binary sequence.

Step 305: Calculate the coding sequence according to the following formula.

Dj = {e ₀ U) + e _x (j) + b ₀ e ₂ /》mod 2

Here is a binary vector of length 20. Represents a vector · · ΐ an element. 1</<12, 0≤ ≤19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=3 at this time.

Step 306: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station.

Concrete embodiment 4

Step 401: The UE sets the value of the PTI ρ = 0 according to the high layer signaling indication or according to the existing feedback period relationship, that is, the content of the feedback is determined.

Step 402: The UE measures the channel according to the value ΡΉ of ΡΉ, and calculates channel information such as RI. Here, the variable r is used to represent the value of RI, w[l, 2, 3, 4}.

Step 403: Calculate the binary representation sequence of RI, satisfying r = 2 + + l and Α ο, ι}.

Step 404: Generate feedback of ΡΤΙ and RI. The obituary is the binary sequence 0, ^, .

Step 405: Calculate the coding sequence according to the following formula.

Dj = {e ₀ {j) + e _x (j) + b ₀ e ₂ /》mod 2

Here is a binary vector of length 20. Represents a vector + 1 element.

1</<12, 0≤ ≤19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=3 at this time.

Step 406: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station.

Specific embodiment 5

It is known that the base station is configured with 8 transmit antenna ports, and the UE end is configured with 8 receive antenna ports. A (20, A) linear block code base sequence β is prestored simultaneously in the base station side and the UE side. , ί .·, , as shown in Table 4. e _t is a binary vector of length 20, 0 ≤ ≤ 12. A is determined by the number of input sequence bits that need to be encoded.

Step 501: The UE sets the PTI according to the high layer signaling indication or according to the existing feedback period relationship. The value of p = l, which determines the content of the feedback.

Step 502: The UE takes the rank RI of the last feedback as the current rank RI according to the value p of ΡΉ. Here, the variable r is used to represent the value of RI, re{l, 2, 3, 4, 5, 7, 8}.

Step 503: Calculate the binary representation sequence H of the RI; ) ₂ , , satisfy r = 4b ₂ +

And » ₂ £ {0,1}.

Step 504: Generate a feedback report of the PTI and the RI, that is, the binary sequence 1, H .

Step 505: Calculate the coding sequence according to the following formula.

d _} = {e ₀ (j) + b ₂ e, (j) + b,e ₂ (j) + b ₀ e ₃ (j)) mod 2

Here is a binary vector of length 20. Represents a vector + 1 element. 1 ≤ / ≤ 12, 0 ≤ _ / ≤ 19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=4 at this time.

Step 506: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station.

Concrete embodiment 6

It is known that the base station is configured with 8 transmit antenna ports, and the UE end is configured with 8 receive antenna ports. The (20, A) linear block code base sequence ^, ^ is pre-stored in the base station side and the UE side, as shown in Table 4. e _t is a binary vector of length 20, 0 ≤ ≤ 12. A is determined by the number of input sequence bits that need to be encoded.

Step 601: The UE sets the value of the PTI to 0 according to the high layer signaling indication or according to the existing feedback period relationship, that is, the content of the feedback is determined.

Step 602: The UE measures the channel according to the value ΡΤΙ of ΡΤΙ, and calculates channel information such as RI. Here, the variable r is used to represent the value of RI, re {1, 2, 3, 4, 5, 7, 8}.

Step 603: Calculate the binary sequence 6» of the RI. Satisfy =4 +2 + + 1 and

W ₂ e{0,l}.

Step 604: Generate a feedback of the PTI and the RI. The binary sequence is 0, b ₂ , b\, b ₀ .

Step 605: Calculate the coding sequence according to the following formula.

d _} = {e ₍₎ {j) + (j) + b ₀ e ₂ (j) + b ₀ e ₃ (j)) mod 2

Here is a binary vector of length 20. C /) represents the vector + 1 element.

1 ≤ / ≤ 12, 0 ≤ 7 ≤ 19. Jcmod2 indicates that the JC pair 2 is reserved. Obviously, A=4 at this time.

Step 606: The UE loads the code sequence «..^ ₁₉ on the current frame and sends it to the base station. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other. It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

Industrial Applicability The embodiments of the present invention can improve the performance of channel information feedback.

Claims

Claim

A method for performing channel information coding feedback, the method comprising:

The mobile terminal combines a precoder type indication (PTI) and a rank indication (RI) into one feedback report, and sets the PTI before the sequence indicating the RI; performs coding of the linear block code on the feedback report to obtain the feedback report. The encoded codeword sequence; the mobile terminal feeds back the codeword sequence to the base station.

2. The method of claim 1 wherein

3. The method of claim 2, wherein

When the mobile terminal is configured with two receiving antenna ports, the feedback report includes one PTI binary bit and one bit representing a binary sequence of RI;

When the mobile terminal is configured with four receiving antenna ports, the feedback report includes one PTI binary bit and two bits of a binary sequence representing RI;

When the mobile terminal is configured with eight receiving antenna ports, the joint to-be-coded sequence includes one PTI binary bit and three bits of a binary sequence representing RI.

4. A method of setting a feedback report, the method comprising:

The mobile terminal combines a precoder type indication (PTI) and a rank indication (RI) into a feedback report, and sets the PTI before the binary sequence representing the RI.

5. The method of claim 4, wherein

6. A mobile terminal that performs channel information coding feedback,

The mobile terminal is configured to: combine a precoder type indication (PTI) and a rank indication (RI) into one feedback report, and set a PTI before the sequence indicating the RI; perform coding of the linear block code on the feedback report, Obtaining a sequence of codewords encoded by the feedback report; feeding the sequence of codewords to a base station.

7. The mobile terminal of claim 6, wherein

8. The mobile terminal of claim 7, wherein

The binary bit of PTI and 1 bit represent the binary sequence of RI;

9. A mobile terminal that sets a feedback report,

The mobile terminal is configured to: combine a precoder type indication (PTI) and a rank indication (RI) into a feedback report, and set the PTI before the binary sequence representing the RI.

10. The mobile terminal of claim 9, wherein