CN102404096A - Feedback method and terminal for hybrid automatic repeat request information - Google Patents

Abstract

The invention discloses a method and a terminal for feeding back HARQ information, wherein the method comprises the following steps: the terminal determines resources corresponding to HARQ information to be fed back and QPSK modulation symbols according to the corresponding relation among the HARQ information, the resources and the QPSK modulation symbols, wherein in the corresponding relation among the HARQ information, the resources and the QPSK modulation symbols, the two bits at the same position in the two pieces of HARQ information corresponding to two QPSK modulation symbols with the same resources and opposite phases are opposite in value; and the terminal feeds back the HARQ information to be fed back by using the determined resources and the QPSK modulation symbols. By the method and the device, the fed back HARQ information bits are protected the same, and the erroneous judgment and the erroneous retransmission of the HARQ information are reduced.

Description

Feedback method and terminal for hybrid automatic repeat request information

technical field

The present invention relates to the field of communications, in particular to a method for feeding back HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) information under carrier aggregation and a terminal.

Background technique

With the development of the mobile communication industry and the increasing demand for mobile data services, people have higher and higher requirements for the speed and quality of service (Qos) of mobile communication. The next generation of mobile communication systems such as the 3rd Generation Partnership Project (3GPP) The long-term evolution (LongTerm Evolution, LTE) project started is attracting more and more people's attention. The highest spectrum bandwidth that the LTE system can provide is 20MHz (megahertz). With the further evolution of the network, LTE-Advanced (LTE-Advanced), as an evolution system of LTE, uses carrier aggregation technology to provide a spectrum bandwidth up to 100MHz, which supports more flexible Higher quality communication.

In a common wireless communication system, UE (User Equipment, user equipment) usually feeds back the correctness of the received data to the transmitter. If the reception is correct, it will feed back an ACK, which can be represented by a binary bit "1"; If there is an error, a NAK is fed back, which can be represented by a binary bit "0" (for the convenience of description, ACK is represented by A and NAK is represented by N in the following), and these A/N information are called HARQ information.

In the LTE-Advanced system, due to the introduction of carrier aggregation, the UE can receive data of multiple carriers at the same time, and needs to feed back multiple bits of HARQ information. The LTE-Advanced standard stipulates that when the number of bits that the UE needs to feed back is M (2≤M≤4) (each bit can indicate the correct/error information of a transport block), the UE needs to feed back the correct and incorrect status of the transport block A specific modulation symbol (QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) modulation symbol) is sent using one of the designated M resources (eg, PUCCH, Physical Uplink Control Channel, physical uplink control channel). Figure 1 shows a schematic diagram of a commonly used QPSK modulation: the binary symbol "00" corresponds to the modulation symbol "1", the binary symbol "01" corresponds to the modulation symbol "-j"; the binary symbol "10" corresponds to the modulation symbol "j"; the binary symbol "10" corresponds to the modulation symbol "j"; The symbol "11" corresponds to the modulation symbol "-1", wherein "1" and "-1" have opposite phases, and "j" and "-j" have opposite phases. Figure 2 shows a scheme for feeding back 4-bit HARQ information in related technologies: the number of bits that the UE needs to feed back is 4, and there are 16 possibilities for the corresponding HARQ information, corresponding to 4 channel resources (H0, H1, H2, H3) 4 possible modulation symbols (in order to make the schematic diagram brief, the modulation symbols corresponding to each HARQ information are not given in Figure 2, which can be referred to in conjunction with Figure 1, for example, the modulation symbol corresponding to NNNN in H0 is 1, the following same). For example, if the HARQ information that the UE needs to feed back is NNNN, the modulation symbol "1" is sent through the resource H0; for another example, the HARQ information that the UE needs to feed back is ANNA, and the UE sends the modulation symbol "j" through the resource H2.

Observing Figure 2, it can be found that: (1) the 0th bit information is carried by the channel index: for example, if the receiving end detects H0 or H1, it knows that the bit is N, otherwise, it is A; (2) the 1st bit information is carried by Channel index carrying: For example, if the receiving end detects H0 or H2, it knows that the bit is N, otherwise, it is A; (3) the 2/3 bit information is carried by specific modulation symbols, and the receiving end detects the specific channel After indexing, perform QPSK demodulation to obtain the 2/3 bit information. For example, the channel detected by the receiving end is H0, and the transmitted modulation symbol is detected as "j" through QPSK demodulation, then the receiving end knows that the 2/3 bit information is NA. It can be seen that in this solution, the performance of the four bits fed back has a relatively large difference.

This difference causes unequal protection of HARQ information bits. Therefore, when considering the performance requirements of HARQ information, if the worst bit is considered, at this time some HARQ information bits have better detection performance than other HARQ information bits. There is no obvious benefit; if the worst bit is not considered, since each HARQ information bit usually corresponds to a certain data stream of a carrier, this difference may lead to incorrect data due to incorrect parsing of HARQ information. Retransmission is necessary, resulting in relatively large differences in HARQ information efficiency between different carriers or different streams of the same carrier. In addition, the incorrect analysis of the HARQ information also leads to too many misjudgments from A to N or N to A, and further, the HARQ buffer data is damaged due to data retransmission.

Therefore, how to avoid the above-mentioned problems caused by the unequal protection of HARQ information bits has become an urgent problem to be solved.

Contents of the invention

The main purpose of the present invention is to provide a method and terminal for feeding back HARQ information under carrier aggregation, so as to at least solve the above problems.

According to one aspect of the present invention, a method for feeding back HARQ information is provided, including: according to the correspondence between HARQ information, resources, and quadrature phase shift keying (QPSK) modulation symbols, the terminal determines the corresponding HARQ information to be fed back. The resources and the QPSK modulation symbols, wherein, in the correspondence between the HARQ information, resources, and QPSK modulation symbols, the two QPSK modulation symbols with opposite phases of the same resource correspond to the two HARQ The values of the two bits at the same position in the information are opposite; the terminal uses the determined resource and the QPSK modulation symbol to feed back the HARQ information to be fed back.

According to another aspect of the present invention, a terminal is provided, including: a determining module, configured to determine the feedback to be fed back according to the correspondence between hybrid automatic repeat request HARQ information, resources, and quadrature phase shift keying QPSK modulation symbols The resources corresponding to the HARQ information and the QPSK modulation symbols, wherein, in the correspondence between the HARQ information, resources, and QPSK modulation symbols, the two QPSK modulation symbols with opposite phases of the same resource correspond to The values of the two bits at the same position in the two HARQ information are opposite; the feedback module is configured to use the determined resource and the QPSK modulation symbol to feed back the HARQ information to be fed back.

Through the present invention, the values of the two bits in the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource are opposite, and for each bit of the HARQ information fed back by the terminal, the receiving end (such as the base station) ) determine that the area of A/N is the same, so that each HARQ information bit sent by the terminal has the same performance, thereby solving the problem caused by the protection of unequal bits, and then achieving no matter what the HARQ information fed back by the terminal is. No matter which designated resource is selected, the protection of the fed back HARQ information bits is the same, reducing the effect of misjudgment and false retransmission of HARQ information.

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 kind of QPSK modulation schematic diagram according to related art;

FIG. 2 is a schematic diagram of a 4-bit HARQ information feedback according to the related art;

FIG. 3 is a flowchart of steps of a method for feedbacking HARQ information according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a 2-bit HARQ information feedback according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a 3-bit HARQ information feedback according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a 4-bit HARQ information feedback according to an embodiment of the present invention;

Fig. 7 is a structural block diagram of a terminal according to an embodiment of the present invention.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. 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 with each other.

The terminal in the embodiment of the present invention uses one of the designated M (2≤M≤4) channel resources according to the received data to send a QPSK modulation symbol to feed back M-bit HARQ information, so as to solve the problem of HARQ information bit unequal problem of protection. For ease of describing the present invention, the present invention makes following assumptions:

(1) The value of the bit number M of the HARQ information fed back by the terminal is configured by a higher layer.

(2) For the M HARQ information bits, the information carried by each bit is related to the received transport block of a certain carrier. If the transport block is detected correctly, the information carried by this bit is A; otherwise, the information carried by this bit is A. Information is N. When it is N, it may be that the transport block detection error, or the terminal did not detect the transport block due to some reasons (for example, the terminal did not detect the resource allocation signaling for the transport block), or the high-level configuration terminal feedback M bit HARQ information, and at a certain moment, the number of transport blocks sent by the transmitter to the terminal is L, assuming L<M, at this time, in addition to feeding back the A/N information of these L transport blocks, the terminal also feeds back ( M-L) bit information, at this time, the information carried by these (M-L) bits is all N, or other reasons that cause the bit value to be N, etc.

(3) Complementary information based on a certain element of HARQ information: that is, the method of determining the complementary information of the i-th element in a known state is to make the i-th element of the known HARQ information take its opposite information, and keep other elements unchanged. For example: for information A, the complementary information based on the 0th element is N; for information A, N, the complementary information based on the 0th element is N, N, and the complementary information based on the 1st element is A, A.

(4) Complementary information of HARQ information: that is, the method of determining the complementary information of certain known HARQ information is to make each element of the known HARQ information take its opposite information. For example: the complementary information of information A is N; the complementary information of information A and A is N, N; the complementary information of information A and N is N, A, etc., and so on.

等等，本领域技术人员可以根据实际情况适当设置。QPSK调制符号中，两个相位相差180度的调制符号互为相位相反的调制符号。为了描述方便，本发明实施例统一采用前面一种。(5) Set four QPSK modulation symbols as 1, -1, j, -j, and of course other forms of QPSK modulation symbols, such as:

etc., those skilled in the art can properly set according to the actual situation. In the QPSK modulation symbols, two modulation symbols with a phase difference of 180 degrees are modulation symbols with opposite phases. For convenience of description, the embodiment of the present invention uniformly adopts the former one.

The above assumptions are applicable to all embodiments of the present invention.

Embodiment one

Referring to FIG. 3 , it shows a flow chart of the steps of a method for feedbacking HARQ information according to an embodiment of the present invention, including the following steps:

Step S302: The terminal determines resources and QPSK modulation symbols corresponding to the HARQ information to be fed back according to the correspondence between HARQ information, resources, and quadrature phase shift keying QPSK modulation symbols;

Among them, in the corresponding relationship between HARQ information, resources, and QPSK modulation symbols, the values of the two bits at the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource are opposite, that is, two HARQ information is complementary information. Taking 2-bit HARQ information as an example, "A" and "N" are opposite values, represented by bit values 1 and 0 respectively, if the 0th bit of the first HARQ information is "A" (bit value is 0) , the first bit is "N" (bit value 1), then the 0th bit of the second HARQ information is "N" (bit value 1), the first bit is "A" (bit value 0 ).

Step S304: the terminal feeds back the HARQ information to be fed back by using the determined resources and QPSK modulation symbols.

After determining the resource and the QPSK modulation symbol, the terminal sends the QPSK modulation symbol on the resource to feed back the HARQ information to be fed back.

In the related art, when the terminal feeds back the HARQ information, it is easy to cause unequal protection of the HARQ information bits, which further leads to misjudgment and erroneous retransmission of the HARQ information. Through this embodiment, the value of the two bits in the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource used by the terminal is opposite, and for each bit of the HARQ information fed back by the terminal, the receiving end ( For example, the base station) judges that the area of the A/N is the same, so that each HARQ information bit sent by the terminal has the same performance, which solves the problem caused by the unequal protection of related technology bits, and then achieves whether the HARQ information fed back by the terminal is What, which designated resource is selected, and the feedback HARQ information bits get the same protection, reducing the effect of misjudgment and false retransmission of HARQ information.

Embodiment two

In this embodiment, the HARQ information represented by the modulation symbol 1 sent by the terminal using a certain resource and the HARQ information represented by the modulation symbol -1 sent by the same resource are complementary information; the HARQ information represented by the modulation symbol j sent by the terminal using a certain resource The information and the HARQ information represented by the modulation symbol -j sent using the same resource are complementary information.

When M=2, four possible HARQ information A, A, A, N, N, A, N, N are divided into two groups: N, N and A, A is a group, and these two information are passed by 2 One of the specified resources (without loss of generality, assuming the 0th), sends modulation symbol 1 or -1 (or j or -j) for feedback; A, N and N, A is another group, Through the other one of the two designated resources (assumed to be the first), send modulation symbols 1 or -1 (or j or -j) for feedback (preferably, if the modulation symbols used for the 0th resource are 1 and - 1, then the modulation symbols used for the first resource are j and -j).

When M=3, similar to M=2,

The two information of A, A, P, N, N, Q are fed back by sending modulation symbols 1 and -1 (or j and -j) through the 0th of the 3 designated resources (preferably, the modulation symbols used Same as when M=2), here it is required that P is different from Q, that is: if P is A, then Q is N; if P is N, then Q is A.

In the same way, the two information of A, N, X and N, A, Y are fed back through the first of the three designated resources, sending modulation symbols 1 and -1 (or j and -j) (preferably, the used The modulation symbol is the same as when M=2), where X and Y are required to be different, that is: if X is A, then Y is N; if X is N, then Y is A.

According to the above four information, the complementary information based on the kth (k=0, 1, 2) element is obtained (it should be noted that the results of k=0, 1, 2 are the same), and these four new information pass through 3 Specify the second resource, and send modulation symbols 1, -1, j, -j for feedback. Of course, it is required here that the HARQ information represented by modulation symbol 1 and the HARQ information represented by modulation symbol -1 are complementary information to each other; the HARQ information represented by modulation symbol j and the HARQ information represented by modulation symbol -j are complementary information to each other.

When M=4, similar to M=3,

A, A, P, J, N, N, Q, K (the values of P and Q are the same as when M=3) send modulation symbols 1 and -1 (or j and -j) to feed back (preferably, the modulation symbol used is the same as M=2), where J is required to be different from K, that is: if J is A, then K is N; if J is N, then K is A ;According to the two information of A, A, P, J, N, N, Q, K, obtain the complementary information based on the kth (k=0, 1, 2, 3) elements, these two new information through 4 The 0th of a specified resource, send another two modulation symbols for feedback (if the modulation symbols used for states A, A, P, J, N, N, Q, K are 1, -1, here j, - j).

A, N, X, U and N, A, Y, V (the value of X, Y is the same as when M=3) transmit modulation symbols 1 and -1 (or j and -j) to feed back (preferably, the modulation symbol used is the same as M=2), where U is required to be different from V, that is: if U is A, then V is N; if U is N, then V is A ;According to the information of A, N, X, U and N, A, Y, V, obtain the complementary k=0, 1, 2, 3 based on the kth element (k=0, 1, 2, 3) , these two new information are fed back by sending the other two modulation symbols through the first of the 4 designated resources (if the modulation symbols used for states A, N, X, U and N, A, Y, V are 1, - 1, use j here, -j).

Assuming that M=3, the four information fed back by the second of the three specified resources are: X1, X2, X3, X4, here it is assumed that X1, X2 is a pair of complementary information, and X3, X4 is a pair of complementary information. When M=4, information X1, P, X2, Q, X3, J, X4, K is fed back by sending modulation symbols 1, -1, j, -j through the second of the 4 designated resources. Here it is required that P is different from Q, that is: if P is A, then Q is N; if P is N, then Q is A; J is different from K, that is: if J is A, then K is N; if J is N , then K is A.

According to the information X1, P, X2, Q, X3, J, X4, K, the complementary information based on the kth element (here the value of k is the same as the previous one) is obtained, and these four new information pass through the third element of the four specified resources. , send modulation symbols 1, -1, j, -j for feedback. Of course, it is required here that the HARQ information represented by modulation symbol 1 and the HARQ information represented by modulation symbol -1 are complementary information to each other; the HARQ information represented by modulation symbol j and the HARQ information represented by modulation symbol -j are complementary information to each other.

Embodiment three

Referring to FIG. 4 , it shows a schematic diagram of 2-bit HARQ information feedback according to an embodiment of the present invention.

In this embodiment, it is assumed that the number of bits of HARQ information that the terminal needs to feed back is 2, and the number of resources that can be used for feedback at this time is H0 and H1. Divide the four possible HARQ information A, A, A, N, N, A, N, N into two groups: N, N and A, A as a group, these two information are sent through H0 modulation symbol 1 and -1 feedback; A, N and N, A are another group, and these two information are fed back by sending modulation symbols j and -j through H1 respectively.

Table 1 shows the HARQ information when M=2, the resource index number and QPSK modulation symbol used for terminal feedback, and the resource index number is used to quickly determine the resource used by the terminal feedback.

Table 1

It should be noted that Table 1 is only an exemplary illustration. In the case where the two HARQ information corresponding to the QPSK modulation symbols of opposite phases of the same resource are complementary (that is, the bit values of the same bit are opposite), those skilled in the art can according to Table 1 needs to be adjusted appropriately. For example: when the HARQ information is "N, N", use the resource index number "1" and the QPSK modulation symbol "1" to feed back, and at the same time, use the resource index number "1" and the QPSK modulation symbol "-1" to feed back the HARQ information "A , A"; or, use resource index number "1" and QPSK modulation symbol "-1" to feed back HARQ information "N, N", and at the same time, use resource index number "1" and QPSK modulation symbol "1" to feed back HARQ information" A, A"; or, use resource index number "0" and QPSK modulation symbol "-1" to feed back HARQ information "N, N", and at the same time, use resource index number "0" and QPSK modulation symbol "1" to feed back HARQ information "A, A"; or, use resource index number "0" and QPSK modulation symbol "j" or "-j" to feed back HARQ information "N, N", and at the same time, use resource index number "0" and QPSK modulation symbol " -j" or "j" feeds back the HARQ information "A, A", etc., which is not limited in the present invention.

Analyze the HARQ information bit protection degree based on the feedback method in Table 1:

Let the received signal after phase compensation be R, where the real part is a and the imaginary part is b, then:

Assuming that the channel detected by the receiving end is H0, the judgment can be made as follows:

For bit 0: a>0, N, otherwise A;

For bit 1: a>0, N, otherwise A;

Assuming that the channel detected by the receiving end is H1, the judgment can be made as follows:

For bit 0: b>0, A, otherwise N;

For bit 1: b>0, N, otherwise A;

According to the above analysis, it can be seen that for each bit, the receiving end judges the area of A/N to be the same. Therefore, using the above scheme, the performance of the two HARQ information bits sent by the terminal is the same, that is: The protection obtained by the 2 HARQ information bits is the same.

Embodiment four

Referring to FIG. 5 , it shows a schematic diagram of 3-bit HARQ information feedback according to an embodiment of the present invention.

In this embodiment, it is assumed that the number of bits of HARQ information that the terminal needs to feed back is 3, and the number of resources that can be used for feedback at this time is H0, H1, and H2 in total.

Utilizing the results in the third embodiment shown in FIG. 4 , for the two pieces of information A, A, P, N, N, and Q, the modulation symbols -1 and 1 are respectively sent and fed back through H0. As an example, let P be N and Q be A here.

Also using the results of the third embodiment shown in FIG. 4 , for the two information of A, N, X and N, A, Y, the modulation symbols j, -j are sent through H1 for feedback respectively. As an example, let X be N and Y be A here.

Using the 4 information of A, A, N, N, N, A, A, N, N and N, A, A, we obtain the complementary information based on the second element A, A, A, N, N, N , A, N, A, N, A, N, these four new information, these four new information are respectively fed back by sending modulation symbols -1, 1, j, -j through H2. It should be noted that: here, the HARQ information represented by modulation symbol 1 and the HARQ information represented by modulation symbol -1 are complementary information; the HARQ information represented by modulation symbol j and the HARQ information represented by modulation symbol -j are complementary information to each other.

Table 2 shows the HARQ information when M=3 and the resource index numbers and QPSK modulation symbols used for terminal feedback.

Table 2

It should be noted that Table 2 is only an exemplary illustration. In the case where the two HARQ information corresponding to the opposite phase QPSK modulation symbols of the same resource are complementary (that is, the bit values of the same bit are opposite), those skilled in the art can according to The adjustment table 2 needs to be properly set, which is not limited by the present invention.

The HARQ information bit protection degree based on the feedback mode in Table 2 is analyzed below:

Let the received signal after phase compensation be R, where the real part is a and the imaginary part is b, then:

Assuming that the channel detected by the receiving end is H0, the judgment can be made as follows:

For bit 0: a>0, N, otherwise A;

For bit 1: a>0, N, otherwise A;

For bit 2: a>0, A, otherwise N;

Assuming that the channel detected by the receiving end is H1, the judgment can be made as follows:

For bit 0: b>0, A, otherwise N;

For bit 1: b>0, N, otherwise A;

For bit 2: b>0, N, otherwise A;

Assuming that the channel detected by the receiving end is H2, the judgment can be made as follows:

For bit 0: b>a, A, otherwise N;

For bit 1: b+a<0, A, otherwise N;

For bit 2: b>a, A, otherwise N;

According to the above analysis, it can be seen that with the above solution, the detection performance of the three HARQ information bits sent by the terminal is the same.

Embodiment five

Referring to FIG. 6 , it shows a schematic diagram of 4-bit HARQ information feedback according to an embodiment of the present invention.

In this embodiment, it is assumed that the number of bits of HARQ information that the terminal needs to feed back is 4, and the number of resources that can be used for feedback at this time is H0, H1, H2, and H3.

Utilizing the results in the fourth embodiment shown in FIG. 5 , the two pieces of information A, A, N, J, N, N, A, and K transmit modulation symbols -1 and 1 through H0, respectively. As an example, let J=A, K=N here. According to the two information of A, A, N, A, N, N, A, N, the complementary information based on the third element is obtained: A, A, NN, N, N, A, A. The two new information are fed back by sending modulation symbols -j and j through H0 respectively.

Also using the result in the fourth embodiment shown in Figure 5, the two information of A, N, N, U and N, A, A, V are respectively sent modulation symbols j and -j (or j, -j) through H1 to feedback. As an example, let U=A, V=N here. According to the two information of A, N, N, A and N, A, A, N, the complementary information based on the third element is obtained: A, N, N, N, N, A, A, A. The two new information are fed back by sending modulation symbols 1 and -1 respectively through H1.

Using the results in the fourth embodiment shown in Figure 5, the four information fed back by H2 when M=3 are: N, N, N, A, A, A, A, N, A, N, A, N, These four modulation symbols are respectively fed back by sending modulation symbols 1, -1, j, -j through H2. When M=4, let N, N, N, P, A, A, A, Q, A, N, A, J, N, A, N, K send modulation symbols 1, -1, j through H2 respectively , -j to feedback. As an example: let P=N, Q=A, J=A, K=N here.

According to the state N, N, N, N, A, A, A, A, A, N, A, A, N, A, N, N, the complementary information based on the third element is obtained: N, N, N, A , A, A, A, N, A, N, A, N, N, A, N, A, these four new information are fed back by sending modulation symbols 1, -1, j, -j respectively through H3. When determining the modulation symbol of each information, the HARQ information represented by the modulation symbol 1 and the HARQ information represented by the modulation symbol -1 are used here as complementary information; the HARQ information represented by the modulation symbol j and the HARQ information represented by the modulation symbol -j The principle that information is complementary information.

Table 3 shows the HARQ information when M=4 and the resource index numbers and QPSK modulation symbols used for terminal feedback.

table 3

It should be noted that Table 3 is only an exemplary illustration. In the case where the two HARQ information corresponding to the opposite phase QPSK modulation symbols of the same resource are complementary (that is, the bit values of the same bit are opposite), those skilled in the art can according to The adjustment table 3 needs to be properly set, which is not limited by the present invention.

The HARQ information bit protection degree based on the feedback mode in Table 3 is analyzed below:

Let the received signal after phase compensation be R, where the real part is a and the imaginary part is b, then:

Assuming that the channel detected by the receiving end is H0, the judgment can be made as follows:

For bit 0: a+b<0, A, otherwise N;

For bit 1: a+b<0, A, otherwise N;

For bit 2: a+b<0, N, otherwise A;

For bit 3: b>a, A, otherwise N;

Assuming that the channel detected by the receiving end is H1, the judgment can be made as follows:

For bit 0: a+b<0, it is N, otherwise it is A;

For bit 1: a+b<0, A, otherwise N;

For bit 2: a+b<0, A, otherwise N;

For bit 3: b>a, A, otherwise N;

Assuming that the channel detected by the receiving end is H2, the judgment can be made as follows:

For bit 0: b>a, A, otherwise N;

For bit 1: a+b<0, A, otherwise N;

For bit 2: b>a, A, otherwise N;

For bit 3: b>a, A, otherwise N;

Assuming that the channel detected by the receiving end is H3, the judgment can be made as follows:

For bit 0: b>a, A, otherwise N;

For bit 1: a+b<0, A, otherwise N;

For bit 2: b>a, A, otherwise N;

For bit 3: b>a, N, otherwise A;

According to the above analysis, it can be seen that with the above solution, the detection performance of the four HARQ information bits sent by the terminal is the same.

Embodiment six

Observing Table 3 and Table 2, it can be found that: when M=4, the resource index number used by the terminal to feed back certain HARQ information X is P, and the QPSK modulation symbol used is Q (Q is one of 1, -1, j, -j ); when M=3, if the resource index number used by the terminal to feed back the HARQ information Y is also P, and the QPSK modulation symbol is also Q, then the first three elements of X are exactly the same as Y. Observing Table 3 and Table 1, Table 2 and Table 1, this relationship also exists, which can be called a "nested structure". This nested structure can effectively avoid the detection ambiguity problem at the receiving end caused by reconfiguration in carrier aggregation.

For example: Assuming that the initial high-level configuration has 3 carriers (one carrier corresponds to one HARQ information bit), at this time the terminal needs to provide feedback in the form of 3-bit HARQ information (even if the terminal only receives data from one carrier, it should also use 3-bit HARQ information) Feedback is performed in the form of HARQ information, and the feedback state is N when no data is received). Then, the high layer reconfigures the two carriers, that is, the terminal is required to give feedback in the form of 2-bit HARQ information. The terminal configured by the high layer may receive the signal incorrectly or correctly (if it is correct, the terminal will receive the signal in the form of 2-bit HARQ information). Feedback, and if the reception is wrong, the terminal will give feedback in the form of 3-bit HARQ information). However, there is still a little delay for the terminal to receive this high-level configuration signaling. During this time, the receiving end does not know whether the terminal is giving feedback in the form of 2-bit HARQ information or in the form of 3-bit HARQ information. If Under the same resource index number and QPSK modulation symbol, the 2-bit HARQ information format is very different from the 3-bit HARQ information format, and there will be a detection ambiguity problem at the receiving end, that is, the receiving end cannot determine which HARQ information format should be used to interpret the terminal feedback of. On the contrary, in this embodiment, the 2-bit HARQ information form, the 3-bit HARQ information form and the 4-bit HARQ information form all satisfy the nested structure. Therefore, for the detection ambiguity problem at the receiving end described above, the receiving end only needs to follow the X-bit HARQ information In combination with the actual scheduling situation in the ambiguity period, only the first Y bits of the HARQ information represented by the received QPSK modulation symbols are explained, and the above-mentioned detection ambiguity problem can be solved, where X=Max(A, B ), where A is the number of HARQ information bits initially configured by the high layer, B is the number of HARQ information bits reconfigured by the high layer, and Max(A, B) is equal to the larger value of A and B. Y = the total number of bits that need to be fed back for actually scheduling carriers.

Here are two examples to illustrate in detail:

Assuming that 3 carriers are initially configured by the upper layer (one carrier corresponds to one HARQ information bit), at this time, the terminal needs to perform feedback in the form of 3-bit HARQ information. Next, the high-level reconfigures the two carriers. Before the terminal receives feedback from the high-level configuration signaling that the high-level configuration signaling is received correctly, this period is the receiving processing ambiguity period. During this period, the maximum number of carriers scheduled to the terminal is 2. However, the feedback received by the receiving end may be fed back in the form of 3-bit HARQ information, or may be fed back in the form of 2-bit HARQ information. The scheme of this embodiment is adopted: for example, the 3-bit HARQ information adopts 2-bit HARQ information as shown in FIG. The HARQ information feedback adopts the feedback form shown in FIG. 4 . The receiving end performs detection in the form of 3-bit HARQ information, and notices that the number of carriers scheduled by the terminal during this ambiguity period does not exceed 2, and the receiving end only needs to pay attention to the first 2 bits represented by the received modulation symbols. Comparing Figure 4 and Figure 5, it can be found that: for H0 and H1, in the case of the same resource and modulation symbol, the first two bits corresponding to the modulation symbol in the 3-bit HARQ information and the 2 bits represented by the same modulation symbol in the 2-bit HARQ information The meanings of the two bits are the same, so no matter whether the terminal performs feedback in the form of 2-bit HARQ information or in the form of 3-bit HARQ information, there will be no processing ambiguity problem at the receiving end.

Assuming that two carriers are initially configured by the upper layer (here, one carrier corresponds to one HARQ information bit), at this time, the terminal needs to perform feedback in the form of 2-bit HARQ information. Next, the high-level reconfigures 3 carriers. Before receiving the feedback from the terminal to receive this high-level configuration signaling, the period of time is the ambiguity period for the receiving end to process. During this period, the maximum number of carriers scheduled to the terminal is 2. However, the feedback received by the receiving end may be fed back in the form of 3-bit HARQ information, or may be fed back in the form of 2-bit HARQ information. The solution of this embodiment is adopted: for example, the 3-bit HARQ information is used as shown in Figure 5, 2 Bit HARQ information feedback adopts the feedback form shown in FIG. 4 . The receiving end performs detection in the form of 3-bit HARQ information, and notices that the number of carriers scheduled by the terminal during this ambiguity period does not exceed 2, and the receiving end only needs to pay attention to the first 2 bits represented by the received modulation symbols.

It can be found that in this embodiment, as long as the receiving end performs detection according to the form of X-bit HARQ information, combined with the actual scheduling situation of the ambiguity period, only the first Y bits of the HARQ information represented by the received QPSK modulation symbols are interpreted, then It can effectively solve the problem of reception processing ambiguity caused by carrier reconfiguration, where X=Max(A, B), where A is the number of HARQ information bits configured by the initial high layer, B is the number of HARQ information bits reconfigured by the high layer, and Max( A, B) is equal to the larger value of A, B. Y = the total number of bits that need to be fed back for actually scheduling carriers.

Of course, when only solving the problem of bit inequality protection, Table 1, Table 2 and Table 3 may not adopt the preferred "nested structure" of this embodiment.

Embodiment seven

Referring to FIG. 7, it shows a structural block diagram of a terminal according to an embodiment of the present invention, including:

The determination module 702 is configured to determine the resources and QPSK modulation symbols corresponding to the HARQ information to be fed back according to the correspondence between HARQ information, resources, and quadrature phase shift keying QPSK modulation symbols, wherein the HARQ information, resources, and QPSK modulation symbols In the correspondence between symbols, the values of the two bits in the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource are opposite; the feedback module 704 is used to use the determined resource and QPSK modulation Symbol feedback HARQ information to be fed back.

Preferably, the determination module 702 is configured to use the HARQ information to be fed back to search and determine the resource index number and QPSK modulation symbol corresponding to the HARQ information to be fed back from a pre-stored correspondence table, wherein the correspondence table is used to store HARQ information, Correspondence between resource index numbers and QPSK modulation symbols, resource index numbers are used to indicate different resources.

Preferably, when the number of bits of the HARQ information to be fed back is 2, the correspondence table is as shown in Table 1; when the number of bits of the HARQ information to be fed back is 3, the correspondence table is as shown in Table 2; When the number of bits of the HARQ information is 4, the correspondence table is shown in Table 3.

Preferably, the resources include M physical uplink control channels, where M is greater than or equal to 2 and less than or equal to 4.

Preferably, in the correspondence between HARQ information, resources and QPSK modulation symbols, when the HARQ information with the number of bits K and the HARQ information with the number of bits N use the same resource and the same QPSK modulation symbol, the number of bits is K The value of the first N bits of the HARQ information is the same as that of the N bits of the HARQ information with the number of bits N, where K is greater than or equal to 2 and less than or equal to 4, N is greater than or equal to 2 and less than or equal to 4, and K is greater than N.

After receiving the HARQ information fed back by the terminal, the receiving end detects the HARQ information in the form of X-bit HARQ information feedback, and combined with the actual scheduling situation in the ambiguity period, only the first Y bits of the HARQ information represented by the received QPSK modulation symbols are processed. Explanation, here X=Max(A, B), wherein, A is the number of HARQ information bits configured by the initial high layer, B is the number of HARQ information bits reconfigured by the high layer, and Max(A, B) is equal to the larger value of A and B . Y = the total number of bits that need to be fed back for actually scheduling carriers.

From the above description, it can be seen that for the LTE-Advanced system, the designated resource in the embodiment of the present invention is PUCCH (Physical Uplink Control Channel), which is especially suitable for the downlink using carrier aggregation technology, and the terminal has multiple HARQ Information bits need to be fed back at the same time, and in order to reduce the peak-to-average ratio of the terminal and save power consumption, the terminal only sends feedback on a single resource of a single carrier.

Through the above-mentioned embodiments of the present invention, no matter what the HARQ information fed back by the terminal is, which one of the M specified resources is selected, the protection obtained by the fed-back HARQ information bits is the same; and, in carrier aggregation, effectively avoiding the Handling ambiguities caused by reconfiguration situations.

It should be noted that those skilled in the art can refer to the embodiments of the present invention and apply the present invention to a non-HE-Advanced system, or a system that specifies resources other than PUCCH, and the present invention is not limited thereto.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention 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, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (15)

1. A feedback method of hybrid automatic repeat request HARQ information, characterized in that, comprising: The terminal determines the resources corresponding to the HARQ information to be fed back and the QPSK modulation symbols according to the correspondence between the HARQ information, resources, and quadrature phase shift keying QPSK modulation symbols, wherein the HARQ information, resources, and QPSK In the correspondence between the modulation symbols, the values of the two bits at the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource are opposite; The terminal feeds back the HARQ information to be fed back by using the determined resource and the QPSK modulation symbol. 2. The method according to claim 1, wherein the terminal determines the resource for feeding back the HARQ information to be fed back according to the correspondence between HARQ information, resources and quadrature phase shift keying (QPSK) modulation symbols And the step of QPSK modulation symbol comprises: The terminal uses the HARQ information to be fed back to search and determine the resource index number corresponding to the HARQ information to be fed back and the QPSK modulation symbol from a pre-stored correspondence table, wherein the correspondence table is used to store The corresponding relationship between the HARQ information, the resource index number, and the QPSK modulation symbol, where the resource index number is used to indicate different resources. 3. The method according to claim 1 or 2, wherein the resources include M physical uplink control channels, and the M is greater than or equal to 2 and less than or equal to 4. 4. The method according to claim 3, wherein, in the correspondence between the HARQ information, resources, and QPSK modulation symbols, when the HARQ information with the number of bits K and the HARQ information with the number of bits N When the HARQ information uses the same resource and the same QPSK modulation symbol, the value of the first N bits of the HARQ information with the number of bits K is the same as that of the N bits of the HARQ information with the number of bits N, Where K is greater than or equal to 2 and less than or equal to 4, N is greater than or equal to 2 and less than or equal to 4, and K is greater than N. 5. The method according to claim 4, wherein when the carrier is reconfigured, the method further comprises: The receiving end receives the HARQ information fed back by the terminal; The receiving end detects the HARQ information according to the larger of the number of bits of the initial high-level configuration HARQ information and the number of bits of the HARQ information reconfigured by the high-level; The receiving end parses the first Y bits of the detected HARQ information, where Y is the total number of bits that need to be fed back for actual carrier scheduling. 6. The method according to claim 1, wherein the correspondence between the HARQ information, resources and QPSK modulation symbols is determined in the following manner: When the number of bits of the HARQ information to be fed back is 2, the bit values of the HARQ information are divided into two groups of AA and NN, AN and NA, wherein the bit value N indicates that the data corresponding to the bit has not been The terminal is correctly received, and the bit value is A, indicating that the data corresponding to the bit has been correctly received by the terminal; Using one of the two designated resources and a pair of QPSK modulation symbols with opposite phases in the QPSK modulation symbols corresponds to any one of the two groups of bit values; Using another resource of the specified two resources and a pair of QPSK modulation symbols with opposite phases among the QPSK modulation symbols corresponds to the remaining group of the two groups of bit values. 7. The method according to claim 6, wherein the correspondence between the HARQ information, resources and QPSK modulation symbols comprises: HARQ information Resource index number QPSK modulation symbols N, N 0 1 N,A 1 -j A, N 1 j A, A 0 -1 8. The method according to claim 1, wherein the correspondence between the HARQ information, resources, and QPSK modulation symbols is determined in the following manner: When the number of bits of the HARQ information to be fed back is 3, the bit values of the HARQ information are divided into four groups: NNA and AAN, NAA and ANN, NNN and AAA, NAN and ANA, where the bit value N represents The data corresponding to the bit has not been correctly received by the terminal, and the bit value is A indicating that the data corresponding to the bit has been correctly received by the terminal; Using the first resource among the specified 3 resources and a pair of QPSK modulation symbols with opposite phases among the QPSK modulation symbols correspond to any one of the four groups of bit values; Using the second resource in the specified 3 resources and a pair of QPSK modulation symbols with opposite phases among the QPSK modulation symbols correspond to any one of the remaining three groups of bit values; Using the third resource among the designated 3 resources and the two pairs of QPSK modulation symbols with opposite phases among the QPSK modulation symbols respectively correspond to the remaining two groups of bit values. 9. The method according to claim 8, wherein the correspondence between the HARQ information, resources and QPSK modulation symbols comprises: comprising: HARQ information Resource index number QPSK modulation symbol N, N, A 0 1 N,A,A 1 -j A, N, N 1 j A, A, N 0 -1 N, N, N 2 1 N,A,N 2 -j A, N, A 2 j A, A, A 2 -1 10. The method according to claim 1, wherein the correspondence between the HARQ information, resources and QPSK modulation symbols is determined in the following manner: When the number of bits of the HARQ information to be fed back is 4, the bit values of the HARQ information are divided into NNAN and AANA, NAAN and ANNA, NNNN and AAAA, NANN and ANAA, NNAA and AANN, ANNN and NAAA, NNNA And eight groups of AAAN, ANAN and NANA, wherein, the bit value N indicates that the data corresponding to the bit has not been correctly received by the terminal, and the bit value A indicates that the data corresponding to the bit has been correctly received by the terminal; Using the first resource among the designated 4 resources and the two pairs of QPSK modulation symbols with opposite phases in the QPSK modulation symbols respectively corresponding to any two groups of the eight groups of bit values; Using the second resource among the designated 4 resources and the two pairs of QPSK modulation symbols with opposite phases in the QPSK modulation symbols respectively correspond to any two groups of the remaining six groups of bit values; Using the third resource in the specified 4 resources and the two pairs of QPSK modulation symbols with opposite phases in the QPSK modulation symbols respectively correspond to any two groups of the remaining four groups of bit values; Using the fourth resource among the designated 4 resources and the two pairs of QPSK modulation symbols with opposite phases among the QPSK modulation symbols respectively correspond to the remaining two groups of bit values. 11. The method according to claim 10, wherein the correspondence between the HARQ information, resources and QPSK modulation symbols comprises: HARQ information Resource index number QPSK modulation symbol N, N, A, N 0 1 N, A, A, N 1 -j A, N, N, A 1 j A, A, N, A 0 -1 N, N, N, N 2 1 N, A, N, N 2 -j A, N, A, A 2 j A, A, A, A 2 -1 N,N,A,A 0 j A, A, N, N 0 -j A, N, N, N 1 1 N,A,A,A 1 -1 N, N, N, A 3 1 A, A, A, N 3 -1 A, N, A, N 3 j N,A,N,A 3 -j 12. A terminal, characterized in that, comprising: A determining module, configured to determine the resource and the QPSK modulation symbol corresponding to the HARQ information to be fed back according to the correspondence between hybrid automatic repeat request HARQ information, resources, and quadrature phase shift keying QPSK modulation symbols, wherein , in the correspondence between the HARQ information, resources, and QPSK modulation symbols, the two bits of the same position in the two HARQ information corresponding to the two QPSK modulation symbols with opposite phases of the same resource The value is opposite; A feedback module, configured to use the determined resource and the QPSK modulation symbol to feed back the HARQ information to be fed back. 13. The terminal according to claim 12, wherein the determination module is configured to use the HARQ information to be fed back to search and determine the resource index corresponding to the HARQ information to be fed back from a pre-stored correspondence table number and the QPSK modulation symbol, wherein the correspondence table is used to store the correspondence between the HARQ information, the resource index number and the QPSK modulation symbol, and the resource index number is used to indicate different the resource. 14. The terminal according to claim 12 or 13, wherein the resources include M physical uplink control channels, and the M is greater than or equal to 2 and less than or equal to 4. 15. The terminal according to claim 14, characterized in that, in the correspondence between the HARQ information, resources and QPSK modulation symbols, when the HARQ information with the number of bits K and the HARQ information with the number of bits N When the HARQ information uses the same resource and the same QPSK modulation symbol, the value of the first N bits of the HARQ information with the number of bits K is the same as that of the N bits of the HARQ information with the number of bits N, Where K is greater than or equal to 2 and less than or equal to 4, N is greater than or equal to 2 and less than or equal to 4, and K is greater than N.

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