CN101227233B - Method and apparatus for sending physics uplink control signal in TDD system - Google Patents

Abstract

The present invention provides a method and device for sending a physical uplink control signal in a time division duplex system. The method includes the following steps: performing channel coding on the uplink control signal to obtain coded bits; performing QPSK modulation on the coded bits to obtain a modulation symbol; The symbols are transformed by DFT to obtain the symbols in the frequency domain; the symbols in the frequency domain are extended in the time domain by using the CAZAC root sequence to obtain the first signal and the second signal sent on the two time slots respectively; the first signal and the second signal are respectively obtained. The second signal is mapped to the corresponding information symbol of PUCCH reference signal structure 2; and the information symbol and the reference signal form a signal to be sent in a subframe. The present invention can well meet the performance requirements and coverage requirements of sending multiple ACK/NACKs in one uplink subframe.

Description

Method and device for sending physical uplink control signal in time division duplex system

technical field

The present invention relates to the field of communications, in particular to a method and device for sending physical uplink control signals in a time division duplex system.

Background technique

The rapid development of digital communication systems puts forward higher requirements for the reliability of data communication. However, under harsh channels, especially in high data rate or high-speed mobile environments, serious problems such as multipath interference and Doppler shift Affecting system performance, effective error control technology, especially Hybrid Automatic Repeat Request (HARQ) technology has become a research hotspot in the communication field.

In the HARQ mode, the code sent by the originator can not only detect errors, but also have certain error correction capabilities. After receiving the code word, the decoder at the receiving end first checks the error situation. If it is within the error correction capability of the code, it will automatically correct the error. If there are many errors that exceed the error correction capability of the code, but it can detect errors, then The receiving end sends a decision signal to the sending end through the feedback channel, requesting the sending end to resend the information. In OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, ACK/NACK (Acknowledged/Non-acknowledged, acknowledgment/not acknowledgment) (that is, physical uplink control signal) is used to indicate the correctness/error of transmission, and This is used to determine whether retransmission is required.

When the ACK/NACK signal is not sent together with the uplink data, the ACK/NACK signal will be sent on a dedicated physical uplink control channel PUCCH (Physical Uplink ControlCHannel). In the current LTE (Long Term Evolution, long-term evolution) system, two PUCCH reference signal structures are defined, as shown in Figure 1 and Figure 2 respectively, where Figure 1 is mainly used to send the format 0/ 1 (that is, ACK/NACK signal). Let me explain here that in the LTE standard, the control signals that can be sent on the PUCCH have multiple formats, which are format 0 to 3. The PUCCH reference signal structure 1 is used to carry format 0, 1, and 3, and the PUCCH reference signal structure 2 is used. To carry format 2.

PUCCH reference signal structure 1 is mainly used to carry ACK/NACK information, but the maximum number of information bits of ACK/NACK is 2. In the schematic diagram, a 1 ms PUCCH includes two 0.5 ms time slots, and the two time slots are respectively located in the upper and lower frequency bands of the system bandwidth in the frequency domain. In the 0.5ms time slot, when the PUCCH uses the conventional cyclic prefix, it includes 7 symbols, numbered #0~#6, and each symbol includes 12 subcarriers in the frequency domain. Among the 7 symbols, 3 are used to send reference signals (symbols numbered #2 to #4), and 4 are used to send ACK/NACK information to be carried (numbered #0, #1, #5, #6 symbol). The PUCCH reference signal structure 1 shown in Figure 1 is used to carry ACK/NACK information, and the sending process is as follows:

1. Perform BPSK/QPSK (Binary Phase Shift Keying/Quaternary Phase Shift Keying, Binary Phase Shift Keying/Quaternary Phase Shift Keying) modulation on 1-bit/2-bit ACK/NACK information to obtain 1 modulation symbol.

2. The modulated symbols are firstly spread in the frequency domain with a spreading factor of 12 (the spreading sequence is a CAZAC root sequence with a length of 12), and then spread in the time domain by a Walsh code with a length of 4.

3. Map the time-frequency extended signal to information symbols corresponding to PUCCH structure 1 as shown in FIG. 1 .

4. The ACK/NACK information carried in the second time slot is the same as that of the first time slot, but in the process of forming the transmitted signal, the spreading sequence used in the frequency domain expansion and the Walsh sequence used in the time domain expansion can be the same as the first time slot One time slot may be different or the same.

5. Finally, the data forming a subframe together with the reference signal is sent out.

For a frequency division duplex (FDD: Frequency Division Duplex) system, since the uplink and downlink subframes are in one-to-one correspondence, the ACK/NACK information bits sent in one uplink subframe are 1 bit or 2 bits, corresponding to 1 stream or 2 streams for downstream transmission. Therefore, for the FDD system, the ACK/NACK signal is sent using the PUCCH reference signal structure shown in FIG. 1 , which can meet the performance and coverage requirements of the ACK/NACK.

However, in the process of realizing the present invention, the inventor found that for a Time Division Duplex (TDD: Time Division Duplex) system, due to the asymmetry of the uplink and downlink, for example, when the downlink transmission subframes are more than the uplink transmission subframes, there will be It may be necessary to send ACK/NACK signals corresponding to multiple downlink transmissions in one uplink subframe. When the number of ACK/NACK information bits to be fed back in an uplink subframe is greater than or equal to 3 bits, if the PUCCH structure in Figure 1 is used for transmission, only higher modulation methods can be used for ACK/NACK, such as 8PSK or 16QAM or higher. However, if high-order modulation is used to send ACK/NACK signals, since the UE (User Equipment, user equipment) is power-limited, it may not be able to meet the performance requirements of ACK/NACK, and this method can The number of supported ACK/NACK information bits is also very limited.

A transmission method is also provided in the prior art, which proposes to independently encode multiple ACK/NACK signals, and use different code resources to transmit on the same time-frequency resource. But the main problem of this method is that the transmitted signal is no longer a single carrier signal, so it will have a high PAR (Peak Average Rate, peak-to-average ratio), which is also unfavorable to the UE.

Contents of the invention

The present invention aims to provide a method and device for sending a physical uplink control signal in a TDD system, which can solve the problem of high PAR caused by independent coding of multiple ACK/NACK signals in the prior art.

In an embodiment of the present invention, a method for transmitting a physical uplink control signal in a TDD system is provided, comprising the following steps: performing channel coding on the uplink control signal to obtain coded bits; performing QPSK modulation on the coded bits to obtain a modulation symbol; The modulation symbols are transformed by DFT (Discrete Fourier Transform, Discrete Fourier Transform) to obtain the symbols in the frequency domain; the symbols in the frequency domain are extended in the time domain by CAZAC (Constant Amplitude Zero Auto-Correlation, constant amplitude zero autocorrelation) sequence , respectively obtain the first signal and the second signal transmitted on the two time slots; map the first signal and the second signal to the corresponding information symbols of the PUCCH reference signal structure 2; and form the information symbols and the reference signals together into a Subframes to be signaled.

In an embodiment of the present invention, a device for transmitting physical uplink control signals in a TDD system is also provided, including: an encoding module, configured to perform channel encoding on the uplink control signals to obtain encoded bits; a modulation module, configured to encode the encoded bits Perform QPSK modulation to obtain a modulation symbol; the transformation module is used to perform DFT transformation on the modulation symbol to obtain symbols in the frequency domain; the extension module is used to perform time domain extension on the symbols in the frequency domain using the CAZAC root sequence, and obtain the symbols in the frequency domain respectively. The first signal and the second signal sent on the two time slots; the mapping module, which is used to map the first signal and the second signal to the corresponding information symbols of PUCCH reference signal structure 2; and the framing module, which is used for information Symbols together with reference signals constitute a subframe to be transmitted.

Because the sending method and device of the above-mentioned embodiments of the present invention use the format 2 of PUCCH to send the physical uplink control signal, there is no need to use a higher modulation method, and because a single carrier is still used, it solves the problem of multiple ACKs in the prior art. The independent encoding of the /NACK signal leads to the problem of high PAR, and can well meet the performance requirements and coverage requirements of ACK/NACK.

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 shows a schematic diagram of PUCCH reference signal structure 1;

FIG. 2 shows a schematic diagram of PUCCH reference signal structure 2;

FIG. 3 shows a flowchart of a method for sending a physical uplink control signal in a time division duplex system according to an embodiment of the present invention;

FIG. 4 shows a flowchart of a method for sending a physical uplink control signal in a time division duplex system according to a preferred embodiment of the present invention;

FIG. 5 shows a structural diagram of a channel reference signal used in a signal transmission method according to an embodiment of the present invention;

FIG. 6 shows a structural diagram of another channel reference signal used in the signal transmission method of the embodiment of the present invention;

Fig. 7 shows a block diagram of a device for sending a physical uplink control signal in a time division duplex system according to an embodiment of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

Figure 2 is used to send format 2 of PUCCH (that is, channel quality indicator CQI (Channel Quality Indicator)). In the schematic diagram, a 1 ms PUCCH includes two 0.5 ms time slots, and the two time slots are respectively located in the upper and lower frequency bands of the system bandwidth in the frequency domain. When the PUCCH uses a conventional cyclic prefix, 7 symbols are included in the 0.5ms time slot, numbered #0-#6, and each symbol includes 12 subcarriers in the frequency domain. Among them, 7 symbols numbered #1 and #5 are used to send reference signals, and 5 symbols #0, #2 to #4 and #6 are used to send CQI information to be carried. The PUCCH reference signal structure 2 shown in Figure 2 is used to carry CQI information, assuming that the CQI bit information to be sent is M, and the sending process is as follows:

1. Perform channel coding on M-bit information to obtain 20 coded bits.

2. Perform QPSK modulation on the coded bits to obtain 10 modulation symbols.

3. Perform frequency-domain spreading with a spreading factor of 12 on each modulation symbol (the spreading sequence is a CAZAC root sequence with a length of 12).

4. Map the spread signal to the corresponding information symbol in 1 ms in the PUCCH reference signal structure 2 shown in Figure 2, and finally form a subframe together with the reference signal to transmit the signal.

It can be seen from the above that by using the PUCCH reference signal structure 2, M-bit information can be sent. Based on the above analysis, the present invention provides a method and device for sending physical uplink control signals in a time division duplex system.

FIG. 3 shows a flowchart of a method for sending a physical uplink control signal in a time division duplex system according to an embodiment of the present invention, including the following steps:

Step S10, performing channel coding on the uplink control signal to obtain coded bits;

Step S20, performing QPSK modulation on the coded bits to obtain modulation symbols;

Step S30, performing DFT transformation on the modulation symbols to obtain symbols in the frequency domain;

Step S40, performing time domain extension on the symbols in the frequency domain using the CAZAC root sequence to obtain the first signal and the second signal transmitted on the two time slots respectively;

Step S50, mapping the first signal and the second signal to corresponding information symbols of PUCCH reference signal structure 2; and

In step S60, the information symbol and the reference signal are combined to form a signal to be transmitted in a subframe.

The transmission method of the above embodiment adopts the reference signal structure 2 of the PUCCH to carry multiple ACK/NACK information bits (that is, the physical uplink control signal), so there is no need to use a higher modulation method, and because the single carrier is still used, it solves the problem of Independent coding of multiple ACK/NACK signals in the prior art leads to a high PAR problem, and can well meet the performance requirements and coverage requirements of ACK/NACK.

Assuming that the number of ACK/NACK information bits to be sent in one uplink subframe is M (M>2), Fig. 4 shows the flow of the method for sending physical uplink control signals in a time division duplex system according to a preferred embodiment of the present invention Figure; Figure 5 shows the channel reference signal structure diagram used in the signal transmission method of the embodiment of the present invention; Figure 6 shows another channel reference signal structure diagram used in the signal transmission method of the embodiment of the present invention. The specific description is as follows:

1) Perform channel coding on M-bit ACK/NACK information to obtain 24 coded bits C(i), i=0, 1, . . . , 23.

2) Perform QPSK modulation on C(i), i=0, 1, . . . , 23 to obtain 12 modulation symbols S _t (i), i=0, 1, .

3) Perform DFT transformation on S _t (i) _, i=0, 1, .

4) The 12 symbols S _f (i) after DFT transformation, i=0, 1, . . . , 11 are extended in the time domain by using a CAZAC root sequence with a length of 5, and the signals sent on the two time slots are respectively obtained Z _f1 (i, k) and Z _f2 (i, k):

Z _f1 (i, k) = S _f (i).CAZAC(u ₁ , k) (Formula 1)

Z _f2 (i, k) = S _f (i).CAZAC(u ₂ , k) (Formula 2)

in:

$\mathrm{<span\; class="notranslate">\; CAZAC</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; uk</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

N=5, u=1, 2, 3, 4, k=0, 1, 2, 3, 4 (Formula 3)

i=0,1,...,11

u ₁ and u ₂ are cell-related parameters.

5) Map the modulated symbols Z _f1 (i, k) and Z _f2 (i, k) after time domain expansion to the corresponding information symbols of PUCCH reference signal structure 2, that is:

When PUCCH uses regular cyclic prefix:

Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0;

Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the first slot number #2;

Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #3;

Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4;

Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #6;

Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot;

Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #2;

Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #3;

Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4;

Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol with the second slot number #6;

When PUCCH uses extended cyclic prefix:

Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0;

Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol whose first slot number is #1;

Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #2;

Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4;

Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #5;

Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot;

Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #1;

Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #2;

Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4;

Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose number is #5 in the second time slot.

6) Finally, together with the reference signal, a subframe is formed to transmit a signal.

Preferably, different UEs use different cyclic shifts of the same CAZAC root sequence.

Each CAZAC root sequence with a length of 5 has 5 cyclic shifts, and they are mutually orthogonal. Therefore, this embodiment can provide 5 UEs to simultaneously send multiple ACK/NACK signals on the same time-frequency resource .

Preferably, different CAZAC root sequences are used on each time slot, corresponding to the time-domain spread sequence hopping enabled in units of time slots, when enabled, u ₁ ≠ u ₂ ; or the same root sequence is used on each time slot The CAZAC root sequence corresponds to the time domain spreading sequence hopping in units of time slots. When it is not enabled, u ₁ =u ₂ .

In this way, the time-domain extended CAZAC root sequence used on each time slot can use different CAZAC root sequences, or the same CAZAC root sequence, which corresponds to the time-domain extended sequence hopping enablement in units of time slots In the two cases of enabling and disabling, u ₁ ≠ u ₂ when enabling, and u ₁ =u ₂ when disabling.

Preferably, when the time-domain spreading sequence hopping in units of time slots is enabled, different cells can use different hopping patterns; and when the time-domain spreading sequence hopping in units of time slots is not enabled, different Cells may use different CAZAC root sequences. This enables randomization of inter-cell interference.

In short, UEs within a cell can use different cyclic shifts of the same CAZAC root sequence for multiplexing, and UEs between cells can also use different CAZAC root sequences to further realize inter-cell interference randomization.

When the number of ACK/NACK information bits to be sent changes, it can be realized through channel coding with different code rates. Preferably, the code rate of the channel coding is set according to the number of information bits of the uplink control signal, so that 24 coded bits are obtained through channel coding.

The transmission method provided by the above-mentioned embodiment of the present invention does not need to adopt a higher modulation method, and the transmission method of the above-mentioned embodiment of the present invention still uses a single carrier signal for transmission, so it solves the problem of multiple ACK/NACK signals in the prior art Performing independent coding leads to a problem of high PAR, and this method can well meet the performance requirements and coverage requirements of ACK/NACK.

FIG. 7 shows a block diagram of a device for sending a physical uplink control signal in a time division duplex system according to an embodiment of the present invention, including:

An encoding module 10, configured to perform channel encoding on the uplink control signal to obtain encoded bits;

The modulation module 20 is used to perform QPSK modulation on the coded bits to obtain a modulation symbol;

A transformation module 30, configured to perform DFT transformation on the modulation symbols to obtain symbols in the frequency domain;

The extension module 40 is used to extend the symbols in the frequency domain using the CAZAC root sequence in the time domain to obtain the first signal and the second signal sent on the two time slots respectively;

A mapping module 50, configured to map the first signal and the second signal to corresponding information symbols of PUCCH reference signal structure 2; and

The framing module 60 is configured to combine information symbols and reference signals into a signal to be sent in a subframe.

Because the sending device of this embodiment uses the format 2 of PUCCH to send the physical uplink control signal, it does not need to use a higher modulation method, and because it uses a single carrier, it solves the problem of independent processing of multiple ACK/NACK signals in the prior art. Coding leads to the problem of high PAR, and can well meet the performance requirements and coverage requirements of ACK/NACK.

Preferably, the number of information bits of the uplink control signal is M, where M>2:

The coding module performs channel coding on the M-bit uplink control signal to obtain 24 coded bits C(i), i=0, 1, . . . , 23;

The modulation module performs QPSK modulation on 24 coded bits C(i), i=0, 1, . . . , 23 to obtain 12 modulation symbols S _t (i), i=0, 1, . . . , 11;

The transformation module performs DFT transformation on the 12 modulation symbols S _t (i), i=0, 1, ..., 11, and obtains symbols S _f (i)i=0, 1, ..., 11 in the frequency domain ;

The extension module performs time domain extension on the symbols S _f (i), i=0, 1, ..., 11 in the frequency domain using a CAZAC root sequence with a length of 5, and obtains the first symbols sent on the two time slots respectively. Signal _Zf1 (i,k) and second signal _Zf2 (i,k):

Z _f1 (i, k) = S _f (i).CAZAC(u ₁ , k)

Z _f2 (i, k) = S _f (i).CAZAC(u ₂ , k)

$\mathrm{<span\; class="notranslate">\; CAZAC</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; uk</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$

Where: N=5, u=1, 2, 3, 4, k=0, 1, 2, 3, 4

i=0,1,...,11

u ₁ and u ₂ are cell-related parameters;

Framing module When PUCCH uses a regular cyclic prefix:

When PUCCH uses regular cyclic prefix:

Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0;

Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the first slot number #2;

Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #3;

Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4;

Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #6;

Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot;

Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #2;

Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #3;

Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4;

Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol with the second slot number #6;

When PUCCH uses extended cyclic prefix:

Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0;

Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol whose first slot number is #1;

Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #2;

Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4;

Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #5;

Map z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol with the second slot number #0;

Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #1;

Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #2;

Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4;

Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose number is #5 in the second time slot.

From the above description, it can be seen that the sending method and device of the embodiments of the present invention do not need to adopt a higher modulation mode, and solve the problem of high PAR caused by independent coding of multiple ACK/NACK signals in the prior art, Therefore, the performance requirements and coverage requirements of ACK/NACK are well met. In addition, UEs within a cell can use different cyclic shifts of the same CAZAC root sequence for multiplexing, while UEs between cells can also use different CAZAC root sequences, which can further realize inter-cell interference randomization.

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 Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. 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 (12)

1. a sending method of physical uplink control signal in a time division duplex system, is characterized in that, comprises the following steps: performing channel coding on the uplink control signal to obtain coded bits; performing QPSK modulation on the encoded bits to obtain modulation symbols; performing DFT transformation on the modulation symbols to obtain symbols in the frequency domain; performing time-domain extension on symbols in the frequency domain by using a CAZAC root sequence, respectively obtaining the first signal and the second signal sent on the two time slots; mapping the first signal and the second signal to corresponding information symbols of PUCCH reference signal structure 2; and The information symbol and the reference signal form a signal to be sent in a subframe. 2. The sending method according to claim 1, wherein the number of information bits of the uplink control signal is M, where M>2, and performing channel coding on the uplink control signal to obtain coded bits specifically includes: Perform channel coding on the M-bit uplink control signal to obtain 24 coded bits C(i), i=0, 1, . . . , 23. 3. The sending method according to claim 2, characterized in that, performing QPSK modulation on the coded bits to obtain a modulation symbol specifically includes: Perform QPSK modulation on 24 coded bits C(i), i=0, 1, ..., 23 to obtain 12 modulation symbols S _t (i), i=0, 1, ..., 11 . 4. The sending method according to claim 3, characterized in that, performing DFT transformation on the modulation symbols to obtain symbols in the frequency domain specifically includes: Perform DFT transformation on the 12 modulation symbols S _t (i), i=0, 1, ..., 11, to obtain symbols S _f (i), i = 0, 1, ... in the frequency domain ., 11. 5. sending method according to claim 4, is characterized in that, adopts CAZAC root sequence to carry out time-domain extension to the symbol on described frequency domain, obtains the first signal and the second signal that are sent on two time slots respectively Specifically include: For the symbols S _f (i) in the frequency domain, i=0, 1, ..., 11, the CAZAC root sequence with a length of 5 is used to perform time-domain extension, and the signals sent on the two time slots are respectively obtained. Said first signal _Zf1 (i,k) and said second signal _Zf2 (i,k): Z _f1 (i, k) = S _f (i).CAZAC(u ₁ , k) Z _f2 (i, k) = S _f (i).CAZAC(u ₂ , k) in: $\mathrm{<span\; class="notranslate">\; CAZAC</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; uk</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$ N=5, u=1, 2, 3, 4, k=0, 1, 2, 3, 4 i=0,1,...,11 u ₁ and u ₂ are cell-related parameters. 6. The sending method according to claim 5, wherein mapping the first signal and the second signal to corresponding information symbols of PUCCH reference signal structure 2 specifically includes: When PUCCH uses regular cyclic prefix: Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0; Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the first slot number #2; Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #3; Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4; Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #6; Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot; Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #2; Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #3; Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4; Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol with the second slot number #6; When PUCCH uses extended cyclic prefix: Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0; Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol whose first slot number is #1; Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #2; Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4; Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #5; Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot; Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #1; Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #2; Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4; Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose number is #5 in the second time slot. 7. sending method according to claim 1, is characterized in that, adopts CAZAC root sequence to carry out time domain extension to the symbol on described frequency domain, obtains the first signal and the second signal that are sent on two time slots respectively Specifically include: Different user equipments use different cyclic shifts of the same CAZAC root sequence for time domain extension. 8. sending method according to claim 5, is characterized in that, adopts CAZAC root sequence to carry out time domain extension to the symbol on described frequency domain, obtains the first signal and the second signal that are sent on two time slots respectively Specifically include: Different CAZAC root sequences are used on each time slot, which corresponds to the enabling of time-domain spreading sequence hopping in units of time slots. When enabled, u ₁ ≠ ₂ ; or The same CAZAC root sequence is used on each time slot, which corresponds to disabling time-domain spreading sequence hopping in units of time slots, and when it is not enabled, u ₁ =u ₂ . 9. sending method according to claim 8, is characterized in that, adopts CAZAC root sequence to carry out time domain extension to the symbol on described frequency domain, obtains the first signal and the second signal that are sent on two time slots respectively Specifically include: When the time-domain spread sequence hopping is enabled in units of time slots, different cells use different hopping patterns; However, when the time-slot-based time-domain spreading sequence hopping is disabled, different cells use different CAZAC root sequences. 10. The sending method according to claim 1, characterized in that, performing channel coding on the uplink control signal to obtain coded bits specifically comprises: The code rate of the channel coding is set according to the number of information bits of the uplink control signal, so that 24 coded bits are obtained through channel coding. 11. A sending device for a physical uplink control signal in a time division duplex system, characterized in that it comprises: An encoding module, configured to perform channel encoding on the uplink control signal to obtain encoded bits; A modulation module, configured to perform QPSK modulation on the coded bits to obtain modulation symbols; A transformation module, configured to perform DFT transformation on the modulation symbols to obtain symbols in the frequency domain; An extension module, configured to extend the symbols in the frequency domain in the time domain using a CAZAC root sequence to obtain the first signal and the second signal sent on the two time slots respectively; A mapping module, configured to map the first signal and the second signal to corresponding information symbols of PUCCH reference signal structure 2; and A framing module, configured to combine the information symbol and the reference signal into a signal to be sent in a subframe. 12. The sending device according to claim 11, wherein the number of information bits of the uplink control signal is M, where M>2: The coding module performs channel coding on the M-bit uplink control signal to obtain 24 coded bits C(i), i=0, 1, ..., 23; The modulation module performs QPSK modulation on 24 coded bits C(i), i=0, 1, ..., 23 to obtain 12 modulation symbols S _t (i), i=0, 1, . . . . , 11; The transformation module performs DFT transformation on the 12 modulation symbols S _t (i), i=0, 1, ..., 11, to obtain symbols S _f (i) in the frequency domain, i=0, 1,...,11; The extension module performs time-domain extension on the symbols S _f (i), i=0, 1, ..., 11 in the frequency domain using the CAZAC root sequence with a length of 5, and obtains The first signal Z _f1 (i, k) and the second signal Z _f2 (i, k) sent on the slot: Z _f1 (i, k) = S _f (i).CAZAC(u ₁ , k) Z _f2 (i, k) = S _f (i).CAZAC(u ₂ , k) in: $\mathrm{<span\; class="notranslate">\; CAZAC</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; uk</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span>$ N=5, u=1, 2, 3, 4, k=0, 1, 2, 3, 4 i=0,1,...,11 u ₁ and u ₂ are cell-related parameters; When the framing module uses a conventional cyclic prefix for the PUCCH: Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0; Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the first slot number #2; Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #3; Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4; Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #6; Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot; Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #2; Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #3; Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4; Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol with the second slot number #6; When PUCCH uses extended cyclic prefix: Map Z _f1 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose first slot number is #0; Map Z _f1 (0:11, 1)→to the 12 subcarriers corresponding to the symbol whose first slot number is #1; Map Z _f1 (0:11, 2)→to the 12 subcarriers corresponding to the symbol whose first slot number is #2; Map Z _f1 (0:11, 3)→to the 12 subcarriers corresponding to the symbol whose first slot number is #4; Map Z _f1 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose first slot number is #5; Map Z _f2 (0:11, 0)→to the 12 subcarriers corresponding to the symbol whose number is #0 in the second time slot; Map Z _f2 (0:11, 1)→to the 12 subcarriers corresponding to the symbol with the second slot number #1; Map Z _f2 (0:11, 2)→to the 12 subcarriers corresponding to the symbol with the second slot number #2; Map Z _f2 (0:11, 3)→to the 12 subcarriers corresponding to the symbol with the second slot number #4; Map Z _f2 (0:11, 4)→to the 12 subcarriers corresponding to the symbol whose number is #5 in the second time slot.

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