WO2010099747A1 - Ack/nack transmission method and base station in long term evolution-advanced system - Google Patents

Abstract

Disclosed are an ACK/NACK transmission method and base station for a long term evolution-advanced (LTE-A) system, said method comprising: calculating a resource indication pair for transmitting ACK/NACK on a Physical Hybrid Automatic Repeat-Request Indicator Channel (PHICH) by using the cyclic shift indicator of one pre-defined Demodulation Reference Symbol (DMRS) from among the DMRSs for all flows (310); feeding back ACK/NACK in the resources indicated by the resource indication pair in PHICH (320). ACK/NACK feedback can thus be assured in both single codeword multi-flow and multi-codeword multi-flow situations. Also disclosed are another ACK/NACK transmission method and base station for a LTE-A system. Another ACK/NACK transmission method embodiment for two codewords of a multi-codeword in LTE-A system includes: modulating an ACK/NACK combination, which is fed back by two codewords, by using QPSK; transmitting said QPSK-modulated ACK/NACK combination of two codewords, by using the resources in PHICH corresponding to one pre-defined codeword of said two codewords. ACK/NACK feedback can thus be assured in multi-codeword situations.

Description

 Method for transmitting ACK/NACK in enhanced long term evolution system, base station The present application claims to be submitted to the Chinese Patent Office on March 4, 2009, application number 200910079055.5, and the invention name is "transmission method of ACK/NACK in enhanced long term evolution system" , the base station, and, in the Chinese patent application filed on March 4, 2009, the Chinese Patent Application No. 200910079054.0, entitled "Transmission Method of ACK/NACK in Enhanced Long Term Evolution System, Base Station", the priority of the Chinese patent application, The entire contents thereof are incorporated herein by reference.

 The present invention relates to the field of wireless communication technologies, and in particular, to a method and a base station for transmitting ACK/NACK in an LTE-A system. Background technique

 Hybrid Automatic Repeat ReQuest (HARQ) is a packet retransmission mechanism established in the communication layer to ensure reliable transmission of data packets. For example, in the 3G standard including WCDMA and TS-SCDMA, and in HSUPA, HSDPA, and the Long Term Evolution (LTE) scheme under development standards, HARQ technology is adopted.

 The basic principle of HARQ is that the retransmission of data packets is performed between the transmitting end and the receiving end, and one of the transmitting end and the receiving end is a base station, and the other is a terminal. Feedback messages include correct answer (ACK) and error acknowledgement (NACK). The receiving end receives the data packet sent by the sending end, and if correctly received, feeds back the correct answer (ACK) message to the sending end, indicating that the current data packet has been correctly transmitted and received, and then the transmitting end performs the sending of the next data packet; If the packet is not received correctly, the error acknowledgement (NACK) message is fed back to the sender, and the sender can retransmit the packet that the receiver does not receive correctly according to the message.

In the Long Term Evolution (LTE) system, the process of feeding back ACK/NACK can be as shown in Figure 1: Step S110: The base station indicates, by using the downlink PDCCH channel, physical resource block (PRB) information that can be occupied by the uplink transmission data, and information such as a Demodulation Reference Symbol (DMRS) of the uplink transmission.

 The PRB information that can be occupied actually includes the minimum PRB number that the subsequent uplink transmission data can occupy in all PRBs, which means that the receiver (here, the terminal) starts from the PRB number in the subsequent uplink data transmission process. Transfer data that needs to be transferred. DMRS, similar to the Midamble code in TD-SCDMA systems, is used for subsequent uplink channel estimation and other processing. A base station generally corresponds to a basic DMRS code, and the DMRS used by the terminal is generally obtained based on the cyclic shift of the basic DMRS code. The DMRS information indicated on the PDCCH is the cyclic shift information of the DMRS code used by the terminal to transmit the uplink data.

 The indicated PRB information and the DMRS information are generally indicated by the DCI format 0, that is, the base station indicates the PRB information that the uplink transmission data can occupy by using the DCI format 0 in the PDCCH (referred to as the lowest _index).

^PRB ) Take 3⁄4J) MRS information (remembered as Li) and so on.

 Step S120: The terminal uses a Physical Uplink Sharing Channel (PUSCH) to transmit data according to the indicated PRB and DMRS.

 After receiving the information such as the PRB and the DMRS indicated on the downlink PDCCH in the foregoing S110, the terminal transmits the uplink data from the resource starting from the indicated minimum PRB on the PUSCH, and adopts the indicated DMRS. As mentioned above, the DMRS is used for uplink channel estimation, that is, after the subsequent base station receives the data transmitted by the terminal through the PUSCH, the DMRS is used for channel estimation, and then the channel uplink estimation data can be used to further demodulate the sent uplink data.

 Step S130: After receiving the uplink data, the base station feeds the ACK/NACK to the terminal through the PHICH.

After receiving the data transmitted on the PUSCH, the base station uses the feedback mechanism in the HARQ to feed back the ACK information if the data is correctly received, and feedback the NACK information if the data cannot be correctly received. The ACK/NACK information that is fed back is processed by modulation, spreading, and scrambling, and then transmitted to the PHICH resource. The ACK/NACK of the feedback occupies a part of the resources on the PHICH.

( group seq \ uu ν% ^ύ s^eq nPHICH, ⁿ PHICH) to indicate. Where ^ denotes the number of the group used in p _fflCH , "PHICH denotes the orthogonal sequence used in a group. In fact, the resources used for transmission in PHICH are divided into different groups, so it is necessary to indicate the ACK/NACK used for transmission. The group used; in a group, there may be different sequences that are orthogonal to each other, and one of the sequences may be used to transmit ACK/NACK. Therefore, it is also necessary to specify the group to be used.

"group _seq

 "H and "PHICH are calculated by the following formula:

 Is the number of groups of PHICHs in the current subframe, which can be configured through higher layer signaling;

PHICH

^N s '"' is the size of the spreading factor at the time of PHICH modulation;

 j lowest index

^PRB is the number of the smallest PRB in the resource indication in DCI format 0;

 _ Jl is configured with 0 in TDD UUDL, and PUSCH is transmitted in subframe 4 or subframe 9 = 0 other

'Drawing is a cyclic shift indication of DMRS in DCI format 0, which can be defined as shown in the following table:

表 1.DCI格式 0中的 DMRS的循环移位指示与 "画的映射关系 可见， 通过上面的公式（1)， 可以计算得到用于指示 PHICH上用来传输

Table 1. The cyclic shift indication of the DMRS in DCI format 0 can be seen by the mapping relationship of the drawing. Through the above formula (1), it can be calculated to indicate the transmission on the PHICH.

 ( group seq

M—~, _MJ W ,,, _H v′ - ⁿ PHICH, ⁿ PHICH) _β

 In the existing LTE and its LTE-A technologies, the process of transmitting data on the uplink PUSCH channel includes transmitting a transport block (TB) to be transmitted through a single stream (data to be transmitted in the TB^_MAC layer) And the aforementioned PRB is a physical resource used to transmit TB on the physical layer). The uplink is transmitted through a single stream, and accordingly, a single DMRS needs to be transmitted. This cyclic shift of the DMRS, which is the "face" of the above formula (1). In the research and practice of the prior art, the inventors found the following problems in the prior art:

 First, in the prior art, only uplink single stream transmission is involved, and only one DMRS for uplink transmission is required. Correspondingly, the downlink feedback ACK/NACK occupies the resources on the PHICH, by the formula

(1) The calculation is determined by including the cyclic shift indication "^^ corresponding to the unique DMRS, and a result is obtained.

 However, in the prior art, there are also cases of uplink multi-stream transmission (i.e., SU-MIMO), and different streams correspond to different DMRSs. The prior art only gives a determination of the transmission in the case of a single stream.

 ( group seq \

 nPHICH, "PHICH" way, does not give a multi-flow case

 ( group seq \

• ^, _v , ^-^., "/WOf,"/WOi), there is no way to feed back ACK/NACK in multi-stream situations.

 Second, in the prior art, only uplink single codeword transmission is involved. Correspondingly, downlink feedback

The resource on the PHICH occupied by the ACK/NACK is calculated by the formula (1) to obtain a result.

However, in the prior art, there are also cases of multi-codeword transmission, and the prior art does not have a scheme of feeding back ACK/NACK in the case of multiple codewords. Summary of the invention An object of the embodiments of the present invention is to provide a method for transmitting ACK/NACK in a LTE-A system, and a base station, to implement feedback ACK/NACK in a multi-stream situation.

 To solve the above technical problem, an embodiment of the present invention provides a method for transmitting ACK/NACK in an LTE-A system, and the base station is implemented as follows:

 A method for transmitting ACK/NACK in an LTE-A system, which is applied to a single codeword multi-stream, and includes:

 Calculating a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indication of a DMRS predefined in the DMRS of all the flows;

 The resource indication at the PHICH feeds back ACK/NACK on the indicated resource.

 A method for transmitting ACK NACK in an LTE-A system, which is applied to a multi-codeword multi-stream, including:

 For each codeword, a resource indication pair for transmitting ACK/NACK on the PHICH is calculated by using a cyclic shift indication of a predefined one of the DMRSs in the DMRS of all the streams of the codeword;

 For each codeword, the resource corresponding to the codeword of the PHICH indicates that the ACK/NACK corresponding to the codeword is fed back to the indicated resource.

 A method for transmitting ACK/NACK in an LTE-A system, which is applied to a multi-codeword multi-stream, including:

 Combine ACK/NACK of multiple codewords;

 In the PHICH, the resource indication pair for transmitting ACK/NACK on the PHICH is calculated by using a cyclic shift indication of a predefined DMRS in the DMRS of all the streams of the pre-defined one codeword or any codeword in the multi-codeword; The resource indication feeds back the merged ACK/NACK on the indicated resource. A base station comprising:

 a calculating unit, configured to calculate a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indication of a predefined DMRS in the DMRS of all streams of the single codeword;

 And a sending unit, configured to: in the PHICH, the resource indication feeds back an ACK/NACK on the indicated resource.

A base station comprising: a calculating unit, configured, for each codeword in the multi-codeword, to calculate a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indication of a predefined one of the DMRSs in the DMRS of all the streams of the codeword ;

 And a sending unit, configured to: for each codeword in the multi-codeword, the resource indication corresponding to the codeword in the PHICH feeds back an ACK/NACK corresponding to the codeword on the indicated resource.

 A base station comprising:

 a merging unit, configured to combine ACK/NACK of multiple codewords;

 a calculating unit, configured to calculate a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indication of a predefined DMRS in a DMRS of a pre-defined one codeword or any codeword in a multi-codeword ;

 And sending, by the resource indication of the PHICH, the ACK/NACK of the merged unit after the merged unit is fed back to the indicated resource.

 As can be seen from the technical solutions provided by the foregoing embodiments of the present invention, the present invention provides a method for determining a resource pair for transmitting ACK/NACK in the case of determining a single codeword multi-stream and multi-codeword multi-stream, thereby determining transmission ACK/NACK. The resources on the PHICH, in turn, implement feedback ACK/NACK.

 Another object of the present invention is to provide an ACK/NACK transmission method and a base station in an LTE-A system to implement feedback ACK/NACK in the case of implementing multiple codewords.

 To solve the above technical problem, an embodiment of the present invention provides a method for transmitting ACK/NACK in an LTE-A system, and the base station is implemented as follows:

 A method for transmitting ACK/NACK in an LTE-A system, for two codewords in a multi-codeword, including:

 Combining the ACK/NACK of the two codeword feedbacks with QPSK;

 Transmitting ACK/NACK combinations of two codewords modulated by QPSK by using resources on the PHICH corresponding to a predefined one of the two codewords,

A method for transmitting ACK/NACK in an LTE-A system, which is applied to a multi-codeword, includes: dividing ACK/NACKs that need to be fed back by multiple codewords into two groups, for each group, all in the group ACK/NACK combining of codeword feedback; Combining the combined ACK/NACK of the two groups by QPSK; transmitting the QPSK modulated ACK/NACK combination by using resources on the PHICH corresponding to a predefined one of the plurality of codewords .

 A base station comprising:

 a modulating unit, configured to modulate an ACK/NACK combination of two codeword feedbacks by using QPSK; and a transmitting unit, configured to use a resource on a PHICH corresponding to a predefined one of the two codewords to transmit ACK/NACK combination of two codewords of QPSK modulation.

 A base station comprising:

 a packet merging unit, configured to divide ACK/NACKs that need to be fed back by multiple codewords into two groups, and for each group, combine ACK/NACKs fed back by all codewords in the group;

 a modulating unit, configured to modulate a combination of ACK/NACK of the combined two groups by using QPSK;

 And a transmitting unit, configured to transmit a QPSK modulated ACK/NACK combination by using resources on the PHICH corresponding to a predefined one of the plurality of codewords.

 It can be seen from the technical solutions provided by the foregoing embodiments of the present invention that the present invention provides a modulation mode for determining ACK/NACK transmitted in a case of multi-codeword single stream and multi-codeword multi-stream, and thus, based on the modulation mode, The resources on the PHICH defining the codeword implement feedback ACK/NACK:. DRAWINGS

 1 is a schematic flowchart of feedback ACK/NACK in the prior art;

 2 is a schematic diagram of a first-class DMRS relationship of codewords according to an embodiment of the present invention;

 3 is a flowchart of a method for transmitting ACK/NACK in a single codeword multi-stream case in an LTE-A system according to an embodiment of the present invention;

 4 is a flowchart of a method for transmitting ACK/NACK in a multi-codeword multi-stream scenario in an LTE-A system according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for transmitting ACK/NACK in a multi-codeword multi-stream case in an LTE-A system according to another embodiment of the present invention; 6 is a block diagram of an embodiment of a base station according to the present invention;

 7 is a block diagram of another embodiment of a base station of the present invention.

 FIG. 8 is a flow chart showing a method for transmitting ACK/NACK in the case of multiple codewords according to still another embodiment of the present invention; FIG.

 FIG. 9 is a flow chart showing a method for transmitting ACK/NACK in the case of multiple codewords according to still another embodiment of the present invention; FIG.

 10 is a block diagram of still another embodiment of a base station according to the present invention;

 11 is a block diagram of another embodiment of a base station of the present invention. detailed description

 The embodiment of the invention provides a method for transmitting ACK/NACK in a LTE-A system, and a base station. In order to make those skilled in the art better understand the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

 First, single code words and multiple code words are explained.

 The single code word corresponds to one TB to be transmitted in the MAC layer, and the multiple code words correspond to a plurality of TBs to be transmitted in the MAC layer. Simply put, if a TB is to be transmitted in the MAC layer, a single codeword is needed. If n TB is required in the MAC layer, a multi-codeword of number n is required.

 For each TB, an ACK/NACK is required for feedback. That is, each codeword requires an ACK/NACK feedback.

 As mentioned above, multi-stream refers to the data stream of the physical layer. For example, one data stream can be divided into multiple spatially multiplexed data streams, and all spatially multiplexed streams are combined at the receiving end to form a complete data. flow.

 In the case of a single codeword, there may be transmission of multiple data streams in the uplink, and the receiving end combines multiple data streams and feeds back one ACK/NACK information.

 For the case of multiple codewords, there may be multiple data stream transmissions in each of the codewords, and the receiving end combines the multiple data streams and feeds back one ACK/NACK information for each codeword.

It should be noted that each stream corresponds to one DMRS. For the above, the example can be visually displayed by one of the cases in FIG. 2. The following describes the ACK/NACK transmission method in the case of single codeword multi-stream in the LTE-A system. FIG. 3 shows a flowchart of the embodiment, including:

 Step S310: Calculate a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indicator of a predefined DMRS in the DMRS of all flows.

 As mentioned above, in the case of a single codeword, only one ACK/NACK is fed back, and an ACK/NACK feedback only needs to occupy a resource indication pair obtained by equation (1).

( group sea \

nPHICH' ⁿ PHICH) for the indicated resource.

 For the case of single codeword multiple streams, each stream corresponds to one DMRS. Each DMRS is obtained after the basic DMRS is cyclically shifted, that is, each DMRS corresponds to a "^^.

_M "group

 As can be seen from equation (1), multiple "iw3⁄4s, possibly corresponding to multiple" /wcw, and thus, in multiple streams

 (group sea , , ~ , , "~, ^τ —— , w ^PHICH^PHICH) , that is, if the single-stream scheme in the prior art is adopted, resources for transmitting multiple ACK/NACKs on the PHICH are obtained, and this As mentioned before, it is unnecessary.

 Therefore, a DMRS can be predefined in the DMRS of all streams, and the specified one DMRS corresponds to a cyclic shift indication "DM3⁄4S. Thus, even for multi-stream transmission, for a single codeword, a resource on the PHICH is still used. Transmit ACK/NACK feedback, ie the feedback is still an ACI /NACKo

Specifically, it can be calculated as follows: nPHICH = ^PRB_ RA ^ + ⁿ DMRS ) ^mo< ^ ^ PHICH + ^ PHICH ^PHICH

yjSeq _ ( j lowest Jndex , _N group , mi 1? ^

n PHICH ~ l ^I PRB_RA ^{1 i} PHICH "ten ⁿ DMRS ) ^moa ", SF ( 2 ) where ⁿ DMRS is a cyclic shift indication of a predefined DMRS in the DMRS of all streams, the cyclic shift indication from the DCI format Obtained in 0;

^^i/ is the number of groups of PHICHs in the current subframe; ^ The size of the spreading factor when ^OT APHICH is modulated;

 τ lowest _index

^PRB indicates the number of the smallest PRB in the resource indication;

 _ Jl is in TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9 = 0 other. Thus, the only resource indication pair in the single codeword even in the case of multiple streams is obtained from equation (2).

(η^ ^οηρ n ^seq

" PHICH > ⁿ PHICH ).

 Step S320: The resource indication in the PHICH feeds back ACK/NACK on the indicated resource. Subsequently, the terminal can obtain the reception status of the codeword TB on the base station side, thereby determining whether to retransmit. The following describes an embodiment of a method for transmitting ACK/NACK in the case of multiple codewords in the LTE-A system, and FIG. 4 shows a flowchart of the embodiment, including:

 Step S410: For each codeword, use a cyclic shift indication of a predefined one of the DMRSs in the DMRS of all the streams of the codeword to calculate a resource indication pair for transmitting ACK/NACK on the PHICH.

 As mentioned above, in the case of a single codeword, only one ACK/NACK is fed back, and an ACK/NACK feedback only needs to occupy a resource indication pair obtained by equation (1).

( group seq \

n PHICH ^ ⁿ PHICH) for the indicated resource.

 Multi-codewords can be thought of as a combination of multiple single-codewords. Therefore, in the case of multiple codewords, it can be split into multiple single codewords.

 Therefore, a DMRS can be predefined in the DMRS of all streams of each single codeword, and the specified one DMRS corresponds to a cyclic shift indication "D dish. Thus, even for multi-stream transmission, for the single codeword, A resource on the PffCH is used to transmit the ACK/NACK feed, that is, the feedback is still an ACK/NACK.

 Specifically, it can be calculated as follows:

 g o"p

 PHICH

 Seq

 n PHICH

group seg

Group seg

 Where "/wc" indicates the number of the group used in the PHICH, indicating the use of a group

 "group „seq

The orthogonal sequence, ( ^npH1CH , ^{np ICH} ) is a resource indication pair for transmitting ACK/NACK on the PHICH;

 "iwis is a cyclic shift indication of a DMRS predefined in a DMRS of all streams of a single codeword, the cyclic shift indication being obtained from DCI format 0;

Is the number of groups of PHICHs in the current subframe; the size of the spreading factor when Ns" ^ICH ^PHICH modulation;

 τ lowest _in ex

 ^ indicates the number of the smallest PRB in the resource indication;

其它 这样， 由公式（3 )得到一单码字的唯一资源指示^ ("^^，"^^)。 步骤 S420: 在 PHICH的所述每一码字对应资源指示对所指示的资源上反 馈各码字对应的 ACK/NACK。 即， 对于多码字中的每一码字， 在 PHICH的该 码字对应资源指示对所指示的资源上反馈该码字对应的 ACK/NACK。 When TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9

Otherwise, a unique resource indication ^ ("^^,"^^) of a single codeword is obtained from equation (3). Step S420: The resource indicator corresponding to each codeword in the PHICH feeds back ACK/NACK corresponding to each codeword on the indicated resource. That is, for each codeword in the multi-codeword, the codeword corresponding resource indication in the PHICH feeds back the ACK/NACK corresponding to the codeword on the indicated resource.

 Subsequently, the terminal can obtain the reception status of each codeword TB on the base station side, thereby determining whether to retransmit. The following describes another embodiment of the transmission method of ACK/NACK in the case of multi-codewords in the LTE-A system. FIG. 5 shows a flowchart of the embodiment, including:

 Step S510: Combine the ACK/NACK of the multi-codeword.

 In the foregoing embodiment shown in FIG. 4, for each codeword, ACK/NACK is fed back according to the embodiment shown in FIG.

In this embodiment, the ACK/NACK of the multi-codeword is first combined. ACK/NACK is represented by a binary word in data transmission. For example, ACK can be represented as 0, and NACK can be identified as 1. Different feedbacks can be combined by the logic and operation of binary words. The following is an example of the simplest two-codeword: A: For one of the codewords, the content of the feedback is NACK, indicating 0, and for the other codeword, the content of the feedback is also NACK, also denoted as 0, then the ACK/NACK of the two codewords are logically ANDed. Also 0;

 B: For one of the codewords, the content of the feedback is NACK, which is represented as 0, and for the other codeword, the content of the feedback is ACK, which is expressed as 1, then the AC/NACK of the two codewords is logically operated. Is 0;

 C: For one of the codewords, the content of the feedback is ACK, denoted as 1, and for the other codeword, the content of the feedback is also ACK, also denoted as 1, then the ACK/NACK of the two codewords are logically ANDed. Also 1

 For multi-codewords of two codewords or more, the way of merging is similar to the above example. For example, for three-codewords, three feedback ACK/NACKs are logically ANDed.

 The combined value can still represent NACK with 0 and ACK with 0. In this case, the merge indicates ACK 1, which means that all codewords are correctly received at the receiving end, and the actual situation is that each codeword is correctly received. The 0 indicating NACK means that all codewords are not correctly received at the receiving end, although the actual situation may be that only some of the codewords are not correctly received at the receiving end, and other codewords are still correctly received, and may be all The code words are not correctly received, but after being combined by logic and operation, it will always mean that all code words are not received correctly.

 Thus, by combining the above logical AND, a plurality of bits representing ACK/NACK fed back by a plurality of codewords can be combined into one bit, thereby saving resources.

 Step S520: Calculate a resource indication pair for transmitting ACK/NACK on the PHICH by using a pre-defined one codeword in the multi-codeword or a cyclic shift indication of a DMRS predefined in any codeword DMRS of all streams.

For the case of multi-codeword multi-stream, each stream of each codeword corresponds to one DMRS. Each DMRS is obtained after the basic DMRS is cyclically shifted, that is, each DMRS corresponds to one ⁿ DMRS _o.

Therefore, a predefined codeword can be selected among the multiple codewords, and the predefined codeword can be based on Station and terminal agreement. Selecting a predefined DMRS in the DMRS of all the selected codewords, and the designated one DMRS corresponds to a cyclic shift indication. Thus, using the dish, even multi-codeword multi-stream transmission still obtains PHICH. The previous resource is used to transmit the ACK/NACK feed.

 Specifically, it can be calculated as follows:

"PHICH

( 4 ) 其中， "/w/c"表示 PHICH中采用的组的编号， "^wc/f表示一个组中采用的 NPHICH II

(4) where "/w/c" indicates the number of the group used in the PHICH, "^wc/f indicates the group used in the group

 „&-oup seq

An orthogonal sequence, (" ^PHICH , "PHicH) is a resource indication pair for transmitting ACK/NACK on the PHICH;

 ^ is a cyclic shift indication of a predefined DMRS in a DMRS of all streams of a predefined codeword or any codeword in the multicodeword, the cyclic shift indication being obtained from DCI format 0; The number of groups of PHICHs in the frame;

^N TM ^C " is the size of the spreading factor at PHICH modulation;

 T lowest one index

^PRB -^ indicates the number of the smallest PRB in the resource indication;

 _ Jl is transmitted in TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9.

JPHICH = ^ ₀ Others, the only resource indication pair for multi-stream case in multi-codewords is obtained by equation (4)

(y.group seq \

V ¹ PHICH > PHICH. Step S530: The resource indication of the PHICH feeds back the combined ACK/NACK on the indicated resource.

 It is still explained in terms of logic and consolidation. For the case of the foregoing ACK after merging, it means that all codewords are correctly received, and the actual situation is that each codeword is correctly received, so after the merged ACK^ is fed to the terminal, the terminal does not need to match any codeword. The TB is retransmitted.

For the case where the foregoing merge is NACK, although the actual situation may be that part of the codeword is at the receiving end. It is not received correctly, and other code words are still received correctly. It may also be that all code words are not correctly received. After combining feedback, all code words are not received correctly. In this way, after receiving the NAC feed of the merged representation, the terminal can retransmit the TB of all codewords.

 Here, the embodiment shown in Fig. 5 can only feed back one ACK/NACK indication for the multi-codeword multi-stream case with respect to the foregoing embodiment shown in Fig. 4, thereby reducing the resources required for transmission.

 As can be seen from the above three embodiments, the present invention provides a method for determining a resource pair for transmitting ACK/NACK in the case of determining a single codeword multi-stream and multi-codeword multi-stream, thereby determining the PHICH on which the ACK/NACK is transmitted. The resource, in turn, implements a feedback ACK/NACK.

 The following describes a base station embodiment of the present invention. The block diagram of the embodiment can be applied to the ACK/NAC feed in the case of a single codeword multi-stream, as shown in FIG.

 The calculating unit 61 is configured to calculate, by using a cyclic shift indication of a predefined DMRS in the DMRS of all the flows, a resource indication pair for transmitting ACK/NACK on the PHICH;

 The sending unit 62 is configured to feed back ACK/NACK on the indicated resource in the resource indication of the PHICH.

 For a specific process of implementing feedback in this embodiment, reference may be made to the method embodiment corresponding to FIG. 3. Another embodiment of the base station of the present invention is described below. The block diagram of the embodiment may also be applied to the ACK/NACK feed in the case of multi-codeword multi-stream, including:

 The calculating unit 61 is configured to calculate, for each codeword, a resource indication pair for transmitting ACK/NACK on the PHICH by using a cyclic shift indication of a predefined one of the DMRSs in the DMRS of all the streams of the codeword;

 The sending unit 62 is configured to: for each codeword, the codeword corresponding resource indication in the PHICH feeds back an ACK/NACK corresponding to the codeword on the indicated resource.

 For a specific process of implementing feedback in this embodiment, reference may be made to the method embodiment corresponding to FIG. A further embodiment of the base station of the present invention is described below. The block diagram of the embodiment can be applied to the ACK/NACK feed in the case of multi-codeword multi-stream, including:

 a merging unit 71, configured to merge ACK/NACK of the multi-codeword;

The calculating unit 72 is configured to utilize a predefined codeword or any codeword in the multi-codeword for all streams A cyclic shift indication of a predefined DMRS in the DMRS is used to calculate a resource indication pair for transmitting ACK/NACK on the PHICH;

 The sending unit 73 is configured to feed back the merged ACK/NACK on the indicated resource on the resource indication of the PHICH.

 For a specific process of implementing feedback in this embodiment, reference may be made to the method embodiment corresponding to FIG. 5. The embodiment of the present invention further provides another LTE/A system transmission method and base station for ACK/NACK. The embodiments of the present invention are further described in detail below with reference to the drawings and embodiments.

 First, single code words and multiple code words are explained.

 The single code word corresponds to one TB to be transmitted in the MAC layer, and the multiple code words correspond to a plurality of TBs to be transmitted in the MAC layer. Simply put, if a TB is to be transmitted in the MAC layer, a single codeword is needed. If n TB is required in the MAC layer, a multi-codeword of number n is required. :

 For each TB, an ACK/NACK is required for feedback. That is, for multiple codewords, each codeword requires an ACK/NACK feedback.

 In addition, it should be noted that in the prior art, the data on the PHICH adopts a Binaiy Phase Shifting Key (BPSK) modulation method. Those skilled in the art will recognize that the results of the BPSK modulation scheme have only two states. Thus, for the feedback of the existing uplink single codeword transmission, since only the reception of the single codeword is needed, the feedback of the single codeword has only two conditions, and only ACK/NACK is needed.

The following describes the transmission method of ACK/NACK in the case of multi-codewords in the LTE-A system. It should be noted that the case where the multi-codeword includes two codewords and more codewords. Thus, the total number of codewords of a multi-codeword can be an odd number of codewords or an even number of codewords. In the first embodiment of the present invention, two codewords in a multi-codeword are divided into one group, and for a total number of odd-numbered codewords, one codeword will eventually remain, and for a total number of even-numbered codewords, Eventually each codeword will be grouped into segments. Thus, for the transmission of ACK/NACK in the case of multiple codewords, it can be regarded as the transmission of ACK/NACK to two codewords divided into the same group (the total number of even digital words), and may also include for individual The transmission of an ACK/NACK of one codeword (in the case of a total number of odd digital words). For the transmission of a single codeword, the prior art approach can be used, and for the transmission of ACK/NACK divided into two codewords in a group, an embodiment of the invention is given below.

 FIG. 8 shows the flow of the embodiment, which specifically includes:

 Step S310: Modulate the ACK/NACK combination of the two codeword feedbacks by using Quaternary Phase Shift Keying (QPSK).

 The ACK/NACK fed back by each codeword has two states - ACK and NACK.

 In the prior art BPSK modulation mode, since the result of the BPSK modulation has only two states, it corresponds to the ACK and NACK states of the feedback, such as 0 for NACK and 1 for ACK. Therefore, the BPSK-modulated symbol can only represent The feedback result of a codeword. That is, the BPSK modulation method adopted in the prior art, one symbol can only be used to represent the ACK/NACK feed result of one codeword.

 If the ACK/NACK feed of one codeword is shown by lbit, and the ACK/NACK feed of another codeword is shown by another lbit, the ACK/NACK feed of the two codewords has four cases, respectively 00. , 01, 10, 11. In this case, the four states can no longer be modulated using the BPSK method with only two results.

 Here, modulation is performed by the QPSK method. The QPSK modulation results are represented by four states in four quadrants. In this way, four combinations of ACK/NACK feedback corresponding to two codewords can be modulated by the QPSK method.

 As an example, let the four states of QPSK be state 1, state 2, state 3, and state 4, respectively. It is possible to use state 1 to correspond to two codewords ACK/NACK to 00, and state 2 to two codes. The word ACK/NACK is a combination of 01, the state 3 corresponds to a combination of two codewords ACK/NACK of 10, and the state 4 corresponds to a combination of two codewords ACK/NACK of 11.

 Step S320: The ACK/NACK combination of the QPSK-modulated two codewords in step 310 is transmitted by using resources on the PHICH corresponding to a predefined one of the two codewords.

In the two codewords, the base station and the terminal may predefine a codeword, and the predefined codeword is similar to the prior art for a predefined one of the two codewords, and the first The resource on the PHICH corresponding to the predefined codeword for transmitting ACK/NACK, that is, the calculation

(η^ ^οηρ n ^seq

, ⁿ PHICH, ⁿ PHICH).

y,gr up _seq

 Specifically, "WWC and "WWOT can be calculated by the following formula:

η^°"Ρ - (J lowest ndex , ^mod N^ ⁰ ^ + 1 Ν ^ουρ

nPHlC ⁱ PHICH

 Seq

( 5 ) 其中： n PHICH

(5) where:

^?/ is the number of PHICH groups in the current subframe, which can be configured by higher layer signaling; N'" ^1CH is the size of the spreading factor when PfflCH modulation;

 r lowest one index

^PRB is the number of the smallest PRB in the resource indication in DCI format 0;

 _ Jl is transmitted in TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9.

 = 0 other .

"Drawing is a cyclic shift indication of a DMRS of a predefined one of the two codewords, the cyclic shift indication being obtained from DCI format 0.

 Of course, the QPSK modulates the ACK/NACK combination of two codewords, and performs conventional spreading, scrambling, etc. before transmission on the PfflCH.

 The above embodiment can be applied to the case of uplink single stream transmission.

 In addition, there is also a case of uplink multi-stream transmission.

 Single stream or multiple stream refers to the data stream of the physical layer. In the case of a single stream, a codeword is transmitted in a data stream. In the case of multiple streams, for example, a data stream of one codeword can be divided into a plurality of spatially multiplexed data streams, and all spatially multiplexed streams are combined at the receiving end to form a complete data stream.

 For the case of multi-codeword multi-stream, there may be multiple data stream transmissions in each codeword uplink, the receiving end combines multiple data streams, and feeds back one ACK/NACK information for each codeword.

For the above, the example can be visually displayed by one of the cases in FIG. 2. For the case where the multi-codeword multi-stream transmission is used in the uplink in the foregoing embodiment shown in FIG. 8, a cyclic shift indication of a predefined DMRS in the DMRS of all streams of the predefined one of the two codewords is utilized. , to calculate a resource indication pair for transmitting ACK/NACK on the PHICH.

 Specifically, "ΜΛ5" in the formula (5) is a cyclic shift indication of the DMRS in the DCI format 0, corresponding to the DMRS of the predefined stream of the predefined one of the two codewords.

 For the embodiment shown in Fig. 8 above, a specific example of a 4-stream multi-flow case will be described below.

 As described above, the four codewords are respectively codeword 1, codeword 2, codeword 3, and codeword 4, and the two are grouped into one group, such as codeword 1 and codeword 2 are grouped together, In the first group, the code word 3 and the code word 4 are grouped into one group, and the second group is set.

 Look at codeword 1 and codeword 2 in group 1.

The multi-stream corresponding to codeword 1 is set to 2 streams, and the cyclic shift indications of the DMRSs corresponding to the 2 streams are respectively M ¹

"D- ¹ W ¹

MRS _? "D-M ² RS · Codeword 2 corresponds to multiple streams set to 2 streams, and the 2 streams correspond to DMRS cyclic shift indications respectively

2-1 2-2

For ⁿ DMRS, ⁿ DMRS.

 Let ACK/NACK fed back by codeword 1 and ACK/NACK fed back by codeword 2 have 4 values, respectively 00, 01, 10, 11, among which 2 bits of content, the left 1 bit can represent the feedback of codeword 1 ACK/NACK, the right 1 bit can represent the ACK/NACK of the codeword 2 feedback:.

 The ACK/NACK fed back for the two codewords is QPSK modulated. The four states of the QPSK modulation result, state 2, state 3, and state 4 can correspond to the four cases of 00, 01, 10, and 11, respectively.

 Then, the ACK/NACK combination of the QPSK modulated two codewords is transmitted by using resources on the PHICH corresponding to one of the two predefined codewords.

 Let the predefined codeword be codeword 1.

Select a pre-defined DMRS in a DMRS of all streams of a codeword 1 with a predefined codeword The cyclic shift indication is set to "Draw, Use" to calculate the resource indication pair on the PfflCH for transmitting ACK/NACK. Substituting into equation (2) can be of the form: nPHICH ~

 nPHICH ~

( 6 ) 其中， &是当前子帧中的 PHICH的组的个数；

(6) where & is the number of groups of PHICHs in the current subframe;

NS ^P is the size of the spreading factor when PHICH is modulated;

 7 lowest one index

^PRB indicates the number of the smallest PRB in the resource indication;

 _J1 When TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9 = 0 Others, from equation (6), ACK/NACK for transmitting codeword 1 and codeword 2 is obtained. The resource indication pair on the combined PWCHCH may further transmit the ACK/NACK combination of the codeword 1 and the codeword 2 by using the resource indication on the Pff1CH corresponding to the codeword 1 to transmit the codeword 1 and the codeword 2. Therefore, the codeword 1 and the ACK/NACKJ of the codeword 2 need only one PHICH resource corresponding to the codeword 1.

 For the codeword 3 and the codeword 4, the processing manner is similar to that of the above codeword 1 and codeword 2, and will not be described again.

 Next, a second embodiment of the present invention will be described. FIG. 9 shows the flow of the embodiment, which may specifically include:

Step S410: The ACK/NACKs that need to be fed back by the plurality of codewords are divided into two groups, and for each group, the ACK/NACKs fed back by all the codewords in the group are combined. ¹

 As mentioned in the foregoing embodiments, ACK/NACK can be represented by a binary word in data transmission, for example, ACK can be represented as 0, and NACK can be identified as 1.

 In this embodiment, different feedbacks can be combined by the logic and operation of binary words. The following is an example of the simplest two-codeword:

A: For one of the codewords, the content of the feedback is NACK, indicating 0, and for the other codeword, the content of the feedback is also NACK, also denoted as 0, then the ACK/NACK of the two codewords is logical. Also after the operation is 0;

 B: For one of the codewords, the content of the feedback is NACK, which is represented as 0, and for the other codeword, the content of the feedback is ACK, which is expressed as 1, then the ACK/NACK of the two codewords is logically AND Is 0;

 C: For one of the codewords, the content of the feedback is ACK, which is 1, and for the other codeword, the content of the feedback is also 1ACK, which is also expressed as 1, then the ACK/NACK of the two codewords is logically ANDed. Also 1

 For multi-codewords of two codewords or more, the way of merging is similar to the above example. For example, for three-codewords, three feedback ACK/NACKs are logically ANDed.

 The combined value can still represent NACK with 0 and ACK with 0. In this case, the merge indicates ACK 1, which means that all codewords are correctly received at the receiving end, and the actual situation is that each codeword is correctly received. The 0 indicating NACK means that all codewords are not correctly received at the receiving end, although the actual situation may be that only some of the codewords are not correctly received at the receiving end, and other codewords are still correctly received, and may be all The code words are not correctly received, but after being combined by logic and operation, it will always mean that all code words are not received correctly.

 Thus, by combining the above logical AND, a plurality of bits representing ACK/NACK fed back by a plurality of codewords can be combined into one bit, thereby saving resources.

 Step S420: Modulate the combination of the ACK/NACK of the merged two groups by using QPSK.

 The combined ACK/NACK of each group of codewords in the two sets of codewords has two states - ACK and NACK.

 In the prior art BPSK modulation mode, since the result of the BPSK modulation has only two states, it corresponds to the ACK and NACK states of the feedback, such as 0 for NACK and 1 for ACK. Therefore, the BPSK-modulated symbol can only represent The feedback result of a codeword. That is, there is a BPSK modulation method adopted by the technology, and one symbol can only be used to represent the ACK/NACK feed result of one codeword.

If lbit^ is used to indicate ACK/NACK feed of one set of codewords in two sets of codewords, and ACK/NACK feed of another set of codewords is shown by another lbit^, then ACK/NACK^ feeds of two codewords are common. Four kinds of love The conditions are 00, 01, 10, and 11, respectively. In this case, the four states can no longer be modulated using the BPSK method with only two results.

 Here, modulation is performed by the QPSK method. The QPSK modulation results are represented by four states in four quadrants. In this way, four combinations of ACK/NACK feedback corresponding to two codewords can be modulated by the QPSK method.

 As an example, let the four states of QPSK be state 1, state 2, state 3, and state 4, respectively. The state 1 can correspond to the combination of two codewords ACK/NACK to 00, and the state 2 corresponds to two codes. The word ACK/NACK is a combination of 01, the state 3 corresponds to a combination of two codewords ACK/NACK of 10, and the state 4 corresponds to a combination of two codewords ACK/NACK of 11.

 Step S430: The QPSK-modulated ACK/NACK combination in step 420 is transmitted by using resources on the PHICH corresponding to one of the plurality of codewords.

 In the plurality of codewords, the base station and the terminal may predefine a codeword, wherein the predefined codeword is similar to the prior art for a predefined one of the plurality of codewords, and the pre-calculation is first performed. Defining the resource on the PHICH corresponding to the codeword for transmitting ACK/NACK, that is, calculating

( _n Sroup seq

, ⁿ PHICH, ⁿ PHICH).

Y.group _seq

 Specifically, "wwc / and "/ ^ can be calculated by the following formula:

Group ₍ j lowest Jndex , od N*""^ +7 Μ^°"Ρ

"PHICH * PRB_RA ^ "DMRS ) " ^{luu 1 v} PHICH ^{T 1} PHICH ^iv PHICH

Seq _ A lowest index ι J group , \ _M - J ^ -κ τ PHICH

"PHICH ~ VJ PRB_RA ^{1 l} PHICH"卞ⁿ DMRS ) ^mOU ", SF ( y ) where:

The number of groups of PHICHs in the current subframe, which can be configured by higher layer signaling; N^ ^ICH is the size of the spreading factor when PHICH modulation;

 τ lowest _index

^PRB is the number of the smallest PRB in the resource indication in DCI format 0;

 _ Jl is configured with 0 in TDD UUDL, and PUSCH is transmitted in subframe 4 or subframe 9 = lo other.

, And is a cyclic shift indication of a DMRS of a predefined one of the plurality of codewords, the cyclic shift indication being obtained from DCI format 0.

 Of course, the ACK/NACK combination of two codewords modulated by QPSK is subjected to conventional spreading, scrambling, etc. before transmission on the PHICH.

 The above embodiment can be applied to the case of uplink single stream transmission.

 In addition, there is also a case of uplink multi-stream transmission.

 For the case where the multi-codeword multi-stream transmission is used in the uplink in the foregoing embodiment shown in FIG. 9, a cyclic shift indication of a predefined DMRS in the DMRS of all the streams of the predefined one of the plurality of codewords is utilized. , to calculate a resource indication pair for transmitting ACK/NACK on the PHICH.

 Specifically, "zw/3⁄4s" in the formula (7) is a cyclic shift indication of the DMRS in the DCI format 0, and corresponds to a DMRS of a predefined stream of the predefined one of the plurality of codewords.

 For the embodiment shown in Fig. 9, the specific example of the 4-stream multi-flow case will be described below.

 As described above, the four codewords are respectively codeword 1, codeword 2, codeword 3, and codeword 4, and the two are grouped into one group, such as codeword 1 and codeword 2 are grouped together, In the first group, the code word 3 and the code word 4 are grouped into one group, and the second group is set.

 Look at codeword 1 and codeword 2 in group 1.

 The multi-stream corresponding to codeword 1 is set to 2 streams, and the cyclic shift indications of the DMRS corresponding to the two streams are respectively "DMRS," DMRS.

The multi-stream corresponding to codeword 2 is set to 2 streams, and the cyclic shift indications of the DMRSs corresponding to the 2 streams are respectively "DMRS," DMRS _β

 Let ACK/NACK fed back by codeword 1 and ACK/NACK fed back by codeword 2 be 0, 1 respectively. That is to say, for codeword 1, the receiving end does not receive correctly, and NACK is fed back, and the receiving end of codeword 2 is correct. Receive, will be feedback ACK.

Combine codeword 1 with ACK/NACK fed back by codeword 2, that is, merge 0 and 1, logically and operationally The result is 0, which means that for codeword 1 and codeword 2, the receiving end is not correctly received.

 Look at the codeword 3 and codeword 4 in the second group.

 The multi-stream corresponding to the codeword 3 is set to two streams, and the cyclic shift indications of the DMRSs corresponding to the two streams are respectively "DMRS, DMRS. The multi-stream corresponding to the codeword 4 is set to two streams, and the two streams correspond to DMRS cyclic shift indication

2-1 2-2

For ⁿ DMRS, ⁿ DMRS. Let ACK/NACK fed back by codeword 3 and ACK/NACK fed back by codeword 4 be 1, 1 respectively, that is, for codeword 3, the receiving end receives correctly, and ACK is fed back, and the receiving end of codeword 4 receives correctly. The ACK will be returned soon.

 Combining codeword 3 with the ACK/NACK fed back by codeword 4, that is, combining 1 and 1, the result of the logical AND operation is 1, indicating that for both codeword 3 and codeword 4, the receiving end receives correctly.

 Next, QPSK modulation is performed on the combination 01 in which the first combination and the result 0 and the second combination are combined, and the combination of the 01 can be expressed by using one of the four states of the QPSK modulation result.

 In fact, for the case of two groups, the combination of the codewords after each combination has four values, which are 00, 01, 10, 11, respectively. Among the contents of 2 bits, the left one can indicate the first The ACK/NACK of a set of codeword feedback, the 1st bit of the right side can represent the ACK/NACK of the second set of codeword feedback. Thus, QPSK modulation is performed on the ACK/NACK fed back for the two sets of codewords. The four states in the QPSK modulation result, state 1, state 2, and state 4, can correspond to the four cases of 00, 01, 10, and 11, respectively.

 Then, the ACK/NACK combination of the QPSK modulated two sets of codewords is transmitted by using resources on the PHICH corresponding to one of the plurality of codewords.

 Let the predefined codeword be codeword 1.

来计算 PHICH上用于传输 ACK/NACK 的资源指示对。 则代入到公式（2 ) 中， 可以为如下形式： yjgr p _ rlowest Judex , 1-1 _mnA Tgroup , τ jgroup Selecting a predefined one codeword-one codeword 1 of all streams of the DMRS in a predefined one of the DMRS cyclic shift indications,

To calculate a resource indication pair for transmitting ACK/NACK on the PHICH. Substituting into formula (2) can be of the form: Yjgr p _ rlowest Judex , 1-1 _mn A Tgroup , τ jgroup

"PHICH-DMRS" ^{11ιυα 1 v} PHICH ^{T 1} PHICH ^{1 v} PHICH

n ^se q - , _N group mod 2N ^PHICH

^{1 1 v} PHICH」卞 "DMRS ) ^muu "、 SF ( 8 ) 其中， 是当前子帧中的 PHICH的组的个数；

时的扩频因子的大小； "PHICH

^{1 1 v} PHICH"卞"DMRS) ^muu ", SF ( 8 ) where is the number of groups of PHICHs in the current subframe;

The size of the spreading factor;

 Lowest lowest index

^PRB indicates the number of the smallest PRB in the resource indication;

 _ Jl when TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9 =| o Others, obtained by equation (5), used to transmit the first group of codewords and the second group of codes a resource indication pair on the PHICH of the ACK/NACK combination of words, such that the resource indication for the indicated resource is transmitted on the PHICH of the predefined codeword 1 to transmit the first set of codewords and the second set of codewords ACK/NACK combination. Therefore, the ACK/NACK combination of the first group of codewords and the second group of codewords only requires one PHICH resource transmission corresponding to the codeword 1.

 As can be seen from the above embodiments, the present invention provides a modulation mode for determining ACK/NACK transmitted in a multi-codeword single stream and a multi-codeword multi-stream case, thereby using a predefined codeword on the PHICH based on the modulation mode. The resource that implements the feedback ACK/NACK:.

 A base station embodiment of the present invention is described below. A block diagram of the embodiment may be as shown in FIG. 10, including:

 a modulating unit 51, configured to modulate the ACK/NACK of the two codeword feedbacks by using QPSK;

 The transmitting unit 52 is configured to transmit, by using resources on the PHICH corresponding to one of the predefined ones of the two codewords, an ACK/NACK combination of two codewords modulated by QPSK.

 For a specific process of implementing feedback in this embodiment, reference may be made to the method embodiment corresponding to FIG. 8. Another embodiment of the base station of the present invention is described below. The block diagram of the embodiment may be as shown in FIG.

a packet merging unit 61, configured to divide ACK/NACKs that need to be fed back by multiple codewords into two groups, For each packet, ACK/NACK of all codeword feedbacks in the group is merged;

 a modulating unit 62, configured to modulate a combination of the combined ACK/NACK of the two groups by using QPSK;

 The transmitting unit 63 is configured to transmit the QPSK modulated ACK/NACK combination by using resources on the PHICH corresponding to the predefined one of the plurality of codewords.

 Preferably, in the base station, the packet merging unit 61 combines ACK/NACK of all codeword feedbacks in each group into logical and merged.

 For a specific process of implementing feedback in this embodiment, reference may be made to the method embodiment corresponding to FIG. It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request  1. An enhanced long-term evolution ACK/NACK transmission method in an LTE-A system, which is applied to a single codeword multi-stream, and is characterized in that it comprises:  Using a demodulation reference symbol of all streams, a cyclic shift indication of a predefined DMRS in the DMRS, calculating a resource indication pair for transmitting ACK/NACK on the physical hybrid automatic request retransmission indication channel PHICH;  The resource indication at the PHICH feeds back ACK/NACK on the indicated resource.  2. The method according to claim 1, wherein the resource indication pair is calculated and calculated by: nP ICH nPHICH

Where " _iwc denotes the number of the group used in _PfflCH , "/w/c// denotes the orthogonal sequence used in one group, (" ^PH1CH , "display) is the resource indication for transmitting ACK/NACK on the PHICH. Correct;  The n-picture is a cyclic shift indication of a predefined DMRS in the DMRS of all streams, and the cyclic shift indication is obtained from DCI format 0;  Is the number of groups of PHICHs in the current subframe; the size of the spreading factor at the time of APHICH modulation; the number of the smallest PRB in the indication; When UL/DL configuration is 0, and PUSCH is transmitted in subframe 4 or subframe 9

 3. An enhanced long-term evolution ACK/NACK transmission method in an LTE-A system, which is applied to a multi-codeword multi-stream, and is characterized in that it includes: For each codeword, a predefined one of the demodulation reference symbols DMRS of all streams of the codeword is utilized a cyclic shift indication of the DMRS, calculating a resource indication pair for transmitting ACK/NACK on the physical hybrid automatic request retransmission indication channel PHICH;  For each codeword, the resource corresponding to the codeword of the PHICH indicates that the ACK/NACK corresponding to the codeword is fed back to the indicated resource.  4. The method of claim 3, wherein calculating the resource indication pair is calculated by: nSr° ^u P - "PHICH one nPHICH =

 Group seq Where "ffic// indicates the number of the group used in _PmCH , "/wc indicates the number used in a group.  "group seq The orthogonal sequence, "P c / / " is the resource indication pair for transmitting ACK/NACK on the pHICH;  "DMis is a cyclic shift indication of a predefined DMRS in a DMRS of all streams of a single codeword, the cyclic shift indication being obtained from DCI format 0;  Is the number of groups of PHICHs in the current subframe; ^N s" ^ICH is the size of the spreading factor in PHICH modulation;  r l loowweesstt i inndeexx l ^pRB indicates the number of the smallest PRB in the resource indication;  _ il in TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9 ^{PH, CH =} [0 other. 5. An enhanced long-term evolution ACK/NACK transmission method in an LTE-A system, which is applied to a multi-codeword multi-stream, and is characterized in that it includes:  Combine ACK/NACK of multiple codewords;  Calculating a physical hybrid automatic request retransmission indication channel PHICH for transmission by using a pre-defined one codeword in a multi-codeword or a cyclic shift indication of a predefined DMRS in the demodulation reference symbol DMRS of all streams of any codeword Resource indication pair of ACK/NACK; The resource indication at the PHICH feeds back the merged ACK/NACK: on the indicated resource. 6. The method according to claim 5, wherein the merging the ACK/NACK of the multi-codeword comprises:  The ACK/NACK of the multi-codeword is combined by logic and operation. 7. The method according to claim 6, wherein the calculating the resource indication pair is calculated by:

 .group ^ eq  Where "wz/OT represents the number of the group used in the PHICH, and "P C" represents the one used in the group.  "group seq An orthogonal sequence, (" ^PHICH , ^{np IC} " is a resource indication pair for transmitting ACK/NACK on the PHICH;  "zwfts is a cyclic shift indication of a predefined DMRS in a DMRS of all streams of a predefined codeword or any codeword in the multicodeword, the cyclic shift indication being obtained from DCI format 0; The number of groups of PfflCH in the subframe; ^N s" ^1C " is the size of the spreading factor at the time of PHICH modulation;  Lowest lowest ^index ^PRB indicates the number of the smallest PRB in the resource indication;  _ il when TDD UUDL is configured with 0, and PUSCH is transmitted in subframe 4 or subframe 9.  = [0 other. 8. A base station, comprising:  a calculating unit, configured to calculate, by using a cyclic shift indication of a demodulation reference symbol DMRS predefined in a DMRS of all streams of a single codeword, to calculate a resource indication pair for transmitting ACK/NACK on the physical hybrid automatic request retransmission indication channel PHICH ;  Transmitting unit, 'the resource indication used in the Pff1CH feeds back ACK/NACK on the indicated resource. A base station, comprising: a calculating unit, configured, for each codeword in the multi-codeword, to calculate a cyclic shift indication of a predefined DMRS in the demodulation reference symbol DMRS of all streams of the codeword, and calculate the PHICH for transmitting ACK/NACK Resource indication pair;  And a sending unit, configured, for each codeword in the multi-codeword, the resource indication corresponding to the codeword in the physical hybrid automatic request retransmission indication channel Pff1CH to feed back the ACK/NACKo corresponding to the codeword on the indicated resource  10. A base station, comprising:  a merging unit, configured to combine ACK/NACK of multiple codewords;  a calculating unit, configured to calculate a physical hybrid automatic request retransmission indication channel by using a pre-defined one DMRS cyclic shift indication in a demodulation reference symbol DMRS of a pre-defined one codeword or any codeword in the multi-codeword a resource indication pair for transmitting ACK/NACK on the PWCHCH;  And a sending unit, configured to feed back, by the resource indication of the PGW, the ACK/NACK after the merge unit is merged on the indicated resource.  11. An enhanced long-term evolution ACK/NACK transmission method in an LTE-A system, characterized in that, for two code words in a multi-codeword, comprising:  The ACK/NACK combination of the two codeword feedbacks is modulated by the quadrature phase shift keying QPSK; the resource on the redirection indication channel Pff1CH is automatically requested by using the physical hybrid corresponding to one of the predefined two codewords , to transmit the ACK/NACK combination of the two codewords modulated by QPSK.  The method according to claim 11, wherein the ACK/NACK combination of the two codeword feedbacks is modulated by using QPSK, including:

Four states in the result. The method according to claim 11, wherein the resources on the PHICH corresponding to a predefined one of the two codewords are calculated by: "Gr p _ (j lowest _ index τηηή N 0U P + TN ^ °" ρ "PHICH - ^PRB RA Ten ^N DMRS ) ^{MOA V} PHICH Ten ¹ PHICH ^IV PHICH  PHICH ^N PHICH = (1/PRB RA * I ^ PHICH J+ ^N DMRS ) ^M0 ^ ^SF where is the number of PHICH groups in the current subframe, configured by higher layer signaling;

^PRB is the number of the smallest PRB in the resource indication in DCI format 0; When UL/DL configuration is 0, and PUSCH is transmitted in subframe 4 or subframe 9

 "ZW is a cyclic shift indication of a DMRS of a predefined one of the two codewords, the cyclic shift indication being obtained from DCI format 0,  The method according to claim 11, wherein, in the case of multi-codeword multi-stream, the resource is transmitted by using resources on a PHICH corresponding to a predefined one of the two codewords. The QPSK modulates the ACK/NACK combination of two codewords, including:  An ACK/NACK combination of two QPSK modulated codewords is transmitted using resources on the PHICH corresponding to a predefined stream of one of the two codewords.  A method for transmitting ACK/NACK in an LTE-A system, which is applied to a multi-codeword, and is characterized in that:  The ACK/NACK that needs to be fed back by multiple codewords is divided into two groups, and for each group, the ACK/NACK fed back by all the codewords in the group is merged;  Combining the combined ACK/NACK of the two groups is modulated by quadrature phase shift keying QPSK;  The QPSK modulated ACK/NACK combination is transmitted by automatically requesting retransmission of resources on the channel PHICH by a physical hybrid corresponding to a predefined one of the plurality of codewords.  16. The method according to claim 15, wherein the ACK/NACK of all the codewords in the group is combined, including: ACK/NACK of all codeword feedbacks in the group is logically combined. The method according to claim 15, wherein the combining the ACK/NACK combination of the two groups is modulated by using QPSK, including: Four states in QPSK modulation results. The method according to claim 15, wherein the resources on the PHICH corresponding to a predefined one of the plurality of codewords are calculated by:

Where ^ is the number of groups of PHICHs in the current subframe, configured by higher layer signaling;

The size of the spreading factor;  Lowest lowest ^index ^PRB -^ The number of the smallest PRB in the resource indication in format 0;  _ il in TDD UL/DL configuration 0, and PUSCH is transmitted in subframe 4 or subframe 9  = |o other ; 3⁄4Λ Λ5 is a cyclic shift indication of a _DMRS of a predefined one of the plurality of codewords, the cyclic shift indication being obtained from DCI format 0.  The method according to claim 15, wherein, in the case of multi-codeword multi-stream, the resource is transmitted through QPSK by using resources on a PHICH corresponding to a predefined one of the plurality of codewords. Modulated ACK/NACK combination, including:  The QPSK modulated ACK/NACK combination is transmitted using resources on the PHICH corresponding to a predefined stream of one of the plurality of codewords.  20. A base station, comprising:  a modulating unit, configured to modulate an ACK/NACK combination of two codeword feedbacks by using a quadrature phase shift keying QPSK; a transmitting unit, configured to automatically retransmit a resource on the PHICH of the indication channel by using a physical hybrid corresponding to a predefined one of the two codewords to transmit two codewords modulated by QPSK ACK/NACK combination.  A base station, comprising:  a packet merging unit, configured to divide ACK/NACKs that need to be fed back by multiple codewords into two groups, and for each group, combine ACK/NACKs fed back by all codewords in the group;  a modulating unit, configured to modulate a combination of the combined ACK/NACK of the two groups by using quadrature phase shift keying QPSK;  And a transmitting unit, configured to automatically transmit a QPSK modulated ACK/NACK combination by using a physical hybrid corresponding to a predefined one of the plurality of codewords to automatically request a resource on the retransmission indicator channel PHICH.  22. The base station of claim 21, wherein the merging is logic and merging.