CN101478379A - Sending method and user equipment for physical uplink control channel - Google Patents
Sending method and user equipment for physical uplink control channel Download PDFInfo
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Abstract
The invention provides a method for transmitting a physical uplink control channel. The method comprises the following steps: the user equipment (UE) decodes the downlink transmitted data information in the physical uplink control channel (PDSCH); the UE judges whether the downlink transmitted data information is accurately received and transmits the acknowledgment/negative acknowledgment (ACK/NACK) messages to a base station in the corresponding transmission mode, wherein the number of codestream of the PDSCH is 4. The invention also provides the user equipment. The transmitting method and the user equipment support the feedback of four ACK/NACK messages at the same time, and meet the requirement for the long-term evolution-advanced (LTE-Advanced) system.
Description
Technical field
The present invention relates to the channel transmission technology, relate in particular to the sending method and the subscriber equipment (UE, User Equipment) of a kind of Physical Uplink Control Channel (PUCCH, Physical Uplink Control Channel).
Background technology
In mobile communication system, adopt and mix automatic request retransmission (HARQ, Hybrid AutomaticRepeat Request) technology is carried out error control, and HARQ has introduced forward error correction, and the data that adopt the HARQ technology to send have the ability of EDC error detection and correction simultaneously.Streams of code words after the chnnel coding that transmitting terminal sends not only can error detection, but also has certain error correcting capability.After the receiving terminal decoder is received streams of code words, at first check error situation, if in the error correcting capability of streams of code words, then carry out error correction automatically, if wrong a lot, surpassed the error correcting capability of streams of code words, but can detect mistake, then receiving terminal sends a control signaling by feedback channel to transmitting terminal, requires transmitting terminal to resend corresponding information.
At OFDM (OFDM, Orthogonal Frequency Division Multiplex) in the system, reply (ACK/NACK by ack/nack, Acknowledgement/Negative Acknowledge-ment) the control signaling represents to transmit correct/error, and transmitting terminal determines whether that according to the ACK/NACK information of receiving needs resend corresponding information.
Long Term Evolution (LTE, Long Terrm Evolution) system is the essential planning of third generation partnership, Fig. 1 shows the structural representation of basic frame structure in the LTE system, as shown in Figure 1, frame structure is divided into radio frames, field, subframe and four grades of time slot, wherein, the length of a radio frames is 10ms, a radio frames is made up of two fields, the length of each field is 5ms, and a field is made up of 5 subframes, and the length of each subframe is 1ms, a subframe is made of two time slots, and the length of each time slot is 0.5ms.When the LTE system adopted regular circulation prefix (CP, Cyclic Prefix), time slot comprised on 7/descending symbol; When the LTE system adopted expansion CP, time slot comprised on 6/descending symbol.
In ofdm system, a Resource Block (RB, Resource Block) is made of 7 OFDM symbols or 6 OFDM symbols, and each OFDM symbol comprises 12 continuous subcarriers, a Resource Unit (RE, Resource Element) is 1 subcarrier in the OFDM symbol.Fig. 2 shows that bandwidth is the structural representation of the Resource Block of 5MHz in the LTE system, as shown in Figure 2, when carrying out resource allocation, is that base unit distributes with the Resource Block.
LTE system definition Physical Downlink Control Channel (PDCCH, Physical Downlink ControlChannel) carrying scheduling distribute and other control information; Physical Control Format Indicator Channel (PCFICH, Physical Control Format Indicator Channel) is carried in the subframe, be used to transmit the information of number of the OFDM symbol of PDCCH, send on first OFDM symbol of subframe, the place frequency location is by system descending bandwidth and little distinctive emblem (ID) decision.Each PDCCH is made up of several control channel unit (CCE, Control Channel Element), and the CCE number of each subframe is by quantity and the downlink bandwidth decision of PDCCH.The CCE of each subframe according to first frequency domain after the serial number of time domain carry out index.The number of the CCE that each PDCCH takies is called the gathering level (Aggregation Level) of PDCCH.
The form of PUCCH (format) is divided into six kinds of format 1, format 1a, format 1b, format 2, format 2a and format 2b, wherein, format 1, format 1a have identical channel architecture with format 1b, format 1 multiply by a fixed modulation symbol on data symbol, illustrate whether have SR information to send by having or not of format 1 channel; Format 1a multiply by a biphase phase shift keying (BPSK, Binary Phase Shift Keying) symbol on data symbol, by the ACK/NACK information of BPSK symbol transmission single codeword stream; Format 1b multiply by a Quadrature Phase Shift Keying (QPSK, Quadrature Phase Shift Keying) symbol on data symbol, by the ACK/NACK information of the two streams of code words of QPSK symbol transmission; Wherein, the ACK/NACK information of corresponding 1 bit of each streams of code words.Format 2, format 2a has identical channel architecture with format 2b, format 2 is used for transmission channel quality indication (CQI on data symbol, Channel Quality Indicator)/pre-coding matrix indication (PMI, recodingMatrix Indicator) and order indication (RI, Rank Indication) information, format 2a is used to transmit CQI/PMI and RI information, the ACK/NACK information of single codeword stream, format 2b is used to transmit CQI/PMI and RI information, the ACK/NACK information of two streams of code words, format 2a and format 2b are used for the scene that Cyclic Prefix is the regular circulation prefix.
Fig. 3 shows the frequency domain position schematic diagram of PUCCH in the LTE system, as shown in Figure 3, and n wherein
PRBRepresent the index of RB on frequency domain,
The total RB number of expression upstream bandwidth, m represents the RB index at PUCCH place, the resource of two Resource Block of each PUCCH channel occupancy.
The channel architecture of PUCCH format 2 is as follows:
When adopting conventional CP, the constant amplitude zero auto-correlation (CAZAC that selects one long 12 computer search to come out, Constant Amplitude Zero Auto Correlation) sequence is as basic sequence, described sequence is repeated 7 times, described sequence of mapping on 12 frequency domain positions on each symbol of a RB, the sequence on each time slot symbol wherein, as the sequence # 0 among Fig. 5, #2, #3, #4 and #6 are as the transfer of data of PUCCH channel, sequence on each time slot symbol, as the sequence # 1 among Fig. 4, #5 is as the reference signal (RS of PUCCH channel, Reference Signal), it is pilot symbol transmission, as shown in Figure 4, the blank representative data symbol of filling, point is filled and is represented RS.
When adopting expansion CP, select CAZAC sequence that one long 12 computer search comes out as basic sequence, described sequence is repeated 6 times, described sequence of mapping on 12 frequency domain positions on each symbol of a RB, the sequence on each time slot symbol wherein, as the sequence # 0 among Fig. 5, #1, #3, #4 and #5 transfer of data as the PUCCH channel, sequence on each time slot symbol, as the RS transmission of the sequence # 2 among Fig. 5 as the PUCCH channel, as shown in Figure 5, the blank representative data symbol of filling, point is filled and is represented RS.
The bit number of coding back CQI/PMI and RI information is 20, bit behind the coding is carried out the QPSK modulation, be modulated to 10 QPSK modulation symbols, 5 QPSK modulation symbols of mapping on each time slot, and make each modulation symbol corresponding with the data sequence of a PUCCH channel, this modulation symbol and target data sequence are multiplied each other, be mapped on the corresponding carrier wave and send.
The channel architecture of PUCCH format 2a is: on the basis of format 2, the ACK/NACK information of 1 bit is carried out the BPSK modulation, then, multiply each other, be mapped to again on the corresponding carrier wave and send with second RS sequence of each time slot in forrmat 2 structures.
The channel architecture of PUCCH format 2b is: on the basis of format 2, the ACK/NACK information of 2 bits is carried out the QPSK modulation, then with format 2 structures in second reference signal sequence of each time slot multiply each other, be mapped to again on the corresponding carrier wave and send.
Long Term Evolution senior (LTE-Advanced) system is the further improvement of general land wireless access (E-UTRA), is the evolution version of LTE Release-8.Except that satisfying 3GPP TR 25.913: all related needs of " Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) (requirement of E-UTRA and E-UTRRAN) ", also will satisfy the demand of the IMT-Advanced of ITU-R proposition.Wherein, the demand with LTE Release-8 backward compatibility is meant: the terminal UE of LTERelease-8 can be worked in the network of LTE-Advanced; The terminal UE of LTE-Advanced can be worked in the network of LTE Release-8.
In addition, LTE-Advanced can comprise the frequency spectrum configuration wideer than LTE Release-8 in the frequency spectrum configuration of different sizes, as the continuous frequency spectrum resource work down of 100MHz, to reach higher performance and target peak speed.Because the LTE-Advanced network needs to insert LTE user, so its operational frequency bands need cover present LTE frequency band, has not had the spectral bandwidth of assignable continuous 100MHz on this frequency range.So the direct technology that LTE-Advanced need solve is that several continuous component carrier frequency (Component carrier) (frequency spectrum) polymerizations that are distributed on the different frequency range are got up to form the operable 100MHz bandwidth of LTE-Advanced.Promptly for the frequency spectrum after assembling, be divided into n component carrier frequency (frequency spectrum), the frequency spectrum in each component carrier frequency (frequency spectrum) is continuous.
The clear and definite descending spatial reuse of LTE-Advanced is the highest among demand research report TR 36.814 V0.1.1 of the LTE-Advanced that proposes in September, 2008 supports 4 streams of code words transmission, that is to say at Frequency Division Duplexing (FDD) (FDD, Frequency Division Duplex) under the pattern, each sub-frame of uplink need feed back four ACK/NACK information.The design of existing LTE only supports to feed back simultaneously two ACK/NACK information, can not support to feed back simultaneously four ACK/NACK information, can't satisfy the demand of LTE-Advanced.
Summary of the invention
In view of this, main purpose of the present invention is to provide the sending method and the subscriber equipment of Physical Uplink Control Channel under a kind of big bandwidth, feedback when can support four ACK/NACK information.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the sending method of a kind of Physical Uplink Control Channel PUCCH, comprising: the downlink transmission data information among the user equipment (UE) decoding physical down data channel PDSCH; UE judges whether this downlink transmission data information is correctly received, and sends to the base station to select corresponding send mode that ack/nack is replied ACK/NACK information; Wherein, the streams of code words number of described PDSCH is 4.
In the technique scheme, described PUCCH comprises eight kinds of forms, is respectively: form format 1, format1a, format 1b, format 1c, format 2, format 2a, format 2b and format 2c;
Wherein, format 1c is modulated to one 16 quadrature amplitude modulation qam symbol for the ACK/NACK information with 4 streams of code words, and sends on data symbol;
Format 2c is modulated to a 16QAM symbol for the ACK/NACK information with 4 streams of code words, and sends on frequency pilot sign.
In the technique scheme, when four ACK/NACK information sent in subframe separately, described send mode sent ACK/NACK information for adopting format 1c.
When four ACK/NACK information and other ascending control informations sent in same subframe, described send mode sent ACK/NACK information for adopting format 2c.
When four ACK/NACK information and other ascending control informations sent in same subframe, described send mode was that ACK/NACK information and other ascending control information carry out combined coding, adopted format2 to send ACK/NACK information.
Described send mode sends four ACK/NACK information for adopting format1b on the PUCCH of respective resources index resource, wherein, the control channel element number of Physical Downlink Control Channel is more than or equal to 4.
Described send mode sends ACK/NACK information for adopt format 1b, format 2b or format 2 simultaneously at two component carriers, sends two ACK/NACK information on each component carrier.
Described send mode carries out the part bindings for four ACK/NACK information that will need to send and generates the ACK/NACK information that two needs send, and adopts the ACK/NACK information after format 1b, format 2b or format 2 send binding then; Described part bindings obtains two ACK/NACK information for respectively two in four ACK/NACK information being carried out and operation.
Described send mode carries out bindings for four ACK/NACK information that will need to send and generates the ACK/NACK information that needs send, and adopts the ACK/NACK information after format 1a, format 2a or format 2 send binding then; Described bindings is and operation.
The present invention also provides a kind of subscriber equipment, comprises decoding unit, judging unit and send mode selected cell, and is concrete:
Decoding unit, the downlink transmission data information of the PDSCH that is used for decoding;
Judging unit is used to judge whether described downlink transmission data information is correctly received;
The send mode selected cell is used for the judged result according to judging unit, selects corresponding send mode that ACK/NACK information is sent to the base station;
Wherein, the streams of code words number of described PDSCH is 4.
The sending method and the subscriber equipment of Physical Uplink Control Channel under the big bandwidth of the present invention, owing to adopt 16 quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) modulation system, utilize the PUCCH resource index or four ACK/NACK information carried out and mode such as operation, feed back when can support four ACK/NACK information, satisfied the demand of LTE-Advanced.
Description of drawings
Fig. 1 is the structural representation of basic frame structure in the LTE system;
Fig. 2 is the schematic diagram of the Resource Block of 5MHz for bandwidth in the LTE system;
Fig. 3 is the frequency domain position schematic diagram of Physical Uplink Control Channel in the LTE system;
PUCCH format 2 channel architecture schematic diagrames when Fig. 4 adopts the regular circulation prefix for system;
Fig. 5 is PUCCH format 2 channel architecture schematic diagrames when system adopts extended cyclic prefix;
Fig. 6 is the sending method schematic flow sheet of PUCCH under the big bandwidth of the present invention.
Embodiment
Basic thought of the present invention is: when sub-frame of uplink need feed back four ACK/NACK information simultaneously, by adopting 16 quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) modulation system, utilize the PUCCH resource index or four ACK/NACK information carried out and mode such as operation, feed back when realizing four ACK/NACK information, satisfy the demand of LTE-Advanced.
Fig. 6 is the sending method schematic flow sheet of PUCCH under the big bandwidth of the present invention, and as shown in Figure 6, this sending method comprises:
Downlink transmission data information in step 1, the UE decoding physical down data channel (PDSCH, Physical Downlink SharedChannel);
Wherein, the streams of code words number of described PDSCH is 4.
Described PUCCH comprises eight kinds of forms, except that six kinds of the prior art, also comprises: format 1c and format 2c; Wherein, format 1c is modulated to a 16QAM symbol for the ACK/NACK information with 4 streams of code words, and multiplies each other with data symbol, sends this ACK/NACK information on data symbol; Format 2c is modulated to a 16QAM symbol for the ACK/NACK information with 4 streams of code words, and multiplies each other with frequency pilot sign, sends this ACK/NACK information on frequency pilot sign.
When four ACK/NACK information sent in subframe separately, described send mode sent ACK/NACK information for adopting format1c.
When four ACK/NACK information and other ascending control informations sent in same subframe, described send mode sent ACK/NACK information for adopting format 2c.
Described send mode can also adopt format 1b to send ACK/NACK information on the PUCCH of respective resources index resource.
Described send mode sends ACK/NACK information for adopt format 1b, format 2b or format 2 respectively at two component carriers.
Described send mode carries out the ACK/NACK information that part binding (sub-bundling) operation generates two needs feedbacks for four ACK/NACK information that will need to feed back, promptly respectively two ACK/NACK information are carried out and operation, generate two ACK/NACK information, adopt the ACK/NACK information after format1b, format 2b or format 2 send binding then.
Described send mode is bound (bundling) operation for four ACK/NACK information that will need to feed back, four ACK/NACK information that are about to feed back are carried out and operation generates the ACK/NACK information that needs feed back, and adopt the ACK/NACK information after format 1a, format 2a or forrmat 2 transmissions are bound then.
Specify the sending method of PUCCH under the big bandwidth of the present invention below in conjunction with embodiment.
Be set in i streams of code words (ACK-CW (i)) when feedback message is ACK, ACK-CW (i)=1, and i streams of code words feedback message be when being NACK, ACK-CW (i)=0; Perhaps, when i streams of code words feedback message is ACK, ACK-CW (i)=0, and i streams of code words feedback message be when being NACK, ACK-CW (i)=1;
For terminal UE, whether in same subframe, send according to ACK/NACK information with other ascending control informations, adopt different modulation system and send mode, specifically referring to following examples.
In the present embodiment, four ACK/NACK information send in subframe separately.
In this case, terminal UE adopts PUCCH format 1c to send.The ACK/NACK information of 4 streams of code words (4 bit ACK-CW (1), ACK-CW (2), ACK-CW (3), ACK-CW (4)) is modulated to a 16QAM symbol; Terminal UE is superior with above-mentioned 16QAM symbol at data symbol, by the ACK/NACK information of 4 streams of code words of 16QAM symbol transmission.
In the present embodiment, four ACK/NACK information and other ascending control informations send in same subframe, and system adopts the regular circulation prefix.
In this case, terminal UE adopts PUCCH format 2c to send.The ACK/NACK information of 4 streams of code words (4 bit ACK-CW (1), ACK-CW (2), ACK-CW (3), ACK-CW (4)) is modulated to a 16QAM symbol; Terminal UE is transmitted CQI or PMI or RI information on data symbol, second of each time slot frequency pilot sign is superior with above-mentioned 16QAM symbol in the subframe, by the ACK/NACK information of 4 streams of code words of 16QAM symbol transmission.
In the present embodiment, when base station configuration adopts 4 streams of code words transmission, base station scheduling is assembled the level restriction for the CCE of the PDCCH of UE and is at least 4, promptly the PDCCH of scheduling this moment take at least 4 CCE, corresponding up PUCCH resource index of each CCE of the PDCCH of terminal UE is given in scheduling.
Under this situation, the ACK/NACK information mapping that terminal UE is fed back is as required selected a PUCCH resource index, and feeds back four ACK/NACK information by PUCCH format 1b on this resource.
Table 1 sends mapping table for the PUCCH of the ACK/NACK information of 4 streams of code words of terminal UE feedback, and is as shown in table 1:
Table 1
Wherein,
Represent the pairing PUCCH resource index of i CCE of PDCCH; B (0), b (1) representative is by two symbols of PUCCH format 1b transmission.The ACK/NACK information that obtains 4 streams of code words when decoding terminals is during for " ACK, ACK, ACK, ACK ", and terminal at index is
PUCCH utilization of resources format 1b transmission two symbols " 0,0 ".When terminal UE is not decoded to PDCCH, be mapped to " DTX, DTX, DTX, DTX " state, it does not send any information to the base station.
The PUCCH resource representation
B (0), b (1) 〉, wherein, i=1,2,3,4, promptly
Four kinds of states are arranged, b (0), b (1)=and 00,01,10,11} also has four kinds of states, so,
B (0), b (1)〉can represent 16 kinds of states, the ACK/NACK information of 4 streams of code words (ACK-CW (1), ACK-CW (2), ACK-CW (3), ACK-CW (4), the value of each feedback information is 0,1; Also corresponding 16 kinds of states; (ACK-CW (1), ACK-CW (2), ACK-CW (3), ACK-CW (4)) and
B (0), b (1)〉corresponding relation be not limited to the example that present embodiment provides, as long as they between set up one-to-one relationship, wherein, when terminal UE is not decoded to PDCCH, be mapped to " DTX, DTX, DTX; DTX " state, promptly do not send any information (corresponding states＜N/A, N/A 〉), all in protection range of the present invention to the base station;
In the present embodiment, four ACK/NACK information and other ascending control informations send in same subframe.
In this case, terminal UE is carried out the ACK/NACK information (4 bits) of 4 streams of code words and other CQI that will transmit or PMI or RI information the combined coding of format 2 forms, each data symbol multiply by the symbol behind this combined coding in the subframe, sends ACK/NACK information on data symbol.
In the present embodiment, terminal UE works in the LTE-Advanced system, utilizes component carrier to send ACK/NACK information.
Under this situation, terminal UE sends ACK/NACK information simultaneously on the PUCCH of two component carriers, adopts PUCCH format 1b/2b/2 carrying to send two ACK/NACK information on the PUCCH of each component carrier.
Preceding two ACK/NACK information-bearings index low/PUCCH of high component carrier on, and send by format 1b, format 2b or format 2 forms; Latter two ACK/NACK information-bearing adopts format 1b, format 2b or format2 form to send on the PUCCH of the high/low component carrier of index simultaneously.
In the present embodiment,, adopt existing form to realize the ACK/NACK transmission of Information by the part bindings.
Under this situation, four ACK/NACK information that terminal UE will need to feed back are carried out the part bindings, generate two needs feedacks, preceding two the ACK/NACK information in four ACK/NACK information that wherein need to feed back carry out generating a feedback information with operation; Latter two ACK/NACK information carries out generating a feedback information with operation.Whether adopt format 1b, format 2a or format 2 to send respectively through two feedback informations basis on the PUCCH of certain component carrier with the multiplexing emission of other ascending control channels with the operation generation.
In the present embodiment,, adopt existing form to realize the ACK/NACK transmission of Information by bindings.
Under this situation, four ACK/NACK information that terminal UE will need to feed back are bound (bundling) operation, need four ACK/NACK information of feedback to carry out generating a feedback information with operation, with operating process in, as long as it is NACK that an ACK/NACK information is arranged, then the result with operation be NACK, only when four ACK/NACK information all are ACK, with the result who operates just be ACK; Whether adopt format 1a, format 2a or format 2 to send respectively through feedback information basis on the PUCCH of certain component carrier with the multiplexing emission of other ascending control channels with the operation generation.
As mentioned above, by means of the sending method of Physical Uplink Control Channel under the big bandwidth provided by the invention, the LTE design can't be fed back the problem of four ACK/NACK information simultaneously when having solved LTE-Advanced system descending spatial reuse.
In order to realize the sending method of above-mentioned PUCCH, the present invention also provides a kind of UE, comprises decoding unit, judging unit and send mode selected cell, and is concrete:
Decoding unit, the downlink transmission data information of the PDSCH that is used for decoding;
Judging unit is used to judge whether described downlink transmission data information is correctly received;
The send mode selected cell is used for the judged result according to judging unit, selects corresponding send mode that ACK/NACK information is sent to the base station;
Wherein, the streams of code words number of described PDSCH is 4.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (12)
1, the sending method of a kind of Physical Uplink Control Channel PUCCH is characterized in that, comprising:
Downlink transmission data information among the user equipment (UE) decoding physical down data channel PDSCH;
UE judges whether this downlink transmission data information is correctly received, and sends to the base station to select corresponding send mode that ack/nack is replied ACK/NACK information;
Wherein, the streams of code words number of described PDSCH is 4.
2, the sending method of PUCCH according to claim 1, it is characterized in that, described PUCCH comprises eight kinds of forms, is respectively: form format 1, format 1a, format 1b, format 1c, format2, format 2a, format 2b and format 2c;
Wherein, format 1c is modulated to one 16 quadrature amplitude modulation qam symbol for the ACK/NACK information with 4 streams of code words, and sends on data symbol;
Format 2c is modulated to a 16QAM symbol for the ACK/NACK information with 4 streams of code words, and sends on frequency pilot sign.
3, the sending method of PUCCH according to claim 2 is characterized in that, when four ACK/NACK information sent in subframe separately, described send mode sent ACK/NACK information for adopting format 1c.
4, the sending method of PUCCH according to claim 2 is characterized in that, when four ACK/NACK information and other ascending control informations sent in same subframe, described send mode sent ACK/NACK information for adopting format 2c.
5, the sending method of PUCCH according to claim 2, it is characterized in that, when four ACK/NACK information and other ascending control informations send in same subframe, described send mode is that ACK/NACK information and other ascending control information carry out combined coding, adopts format 2 to send ACK/NACK information.
6, the sending method of PUCCH according to claim 2, it is characterized in that, described send mode sends four ACK/NACK information for adopting format 1b on the PUCCH of respective resources index resource, wherein, the control channel element number of Physical Downlink Control Channel is more than or equal to 4.
7, the sending method of PUCCH according to claim 2, it is characterized in that, described send mode sends ACK/NACK information for adopt format 1b, format 2b or format 2 simultaneously at two component carriers, sends two ACK/NACK information on each component carrier.
8, the sending method of PUCCH according to claim 2, it is characterized in that, described send mode carries out the part bindings for four ACK/NACK information that will need to send and generates the ACK/NACK information that two needs send, and adopts the ACK/NACK information after format 1b, format 2b or format 2 send binding then.
9, the sending method of PUCCH according to claim 8 is characterized in that, described part bindings obtains two ACK/NACK information for respectively two in four ACK/NACK information being carried out and operation.
10, the sending method of PUCCH according to claim 2, it is characterized in that, described send mode carries out bindings for four ACK/NACK information that will need to send and generates the ACK/NACK information that needs send, and adopts the ACK/NACK information after format 1a, format 2a or format 2 send binding then.
11, the sending method of PUCCH according to claim 10 is characterized in that, described bindings is and operation.
12, a kind of subscriber equipment is characterized in that, comprises decoding unit, judging unit and send mode selected cell, and is concrete:
Decoding unit, the downlink transmission data information of the PDSCH that is used for decoding;
Judging unit is used to judge whether described downlink transmission data information is correctly received;
The send mode selected cell is used for the judged result according to judging unit, selects corresponding send mode that ACK/NACK information is sent to the base station;
Wherein, the streams of code words number of described PDSCH is 4.
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