CN101826948B - Transmission method of ACK/NACK in enhanced long-period evolution system and base station - Google Patents

Abstract

The invention relates to a transmission method of ACK/NACK in a LTE-A system and a base station. The transmission method of ACK/NACK in a LET-A system comprises the following steps that: a pre-defined DMRS cyclic shift in DMRS of all streams is utilized to indicate and calculate a resource indication pair for transmitting ACK/NACK on a PHICH signal channel; and ACK/NACK is fed back on a resource indicated by the resource indication pair of PHICH. By utilizing the method, the ACK/NACK can be fed back under the condition of single code word multi-stream and multi-code-word multi-stream.

Description

The transmission method of ACK/NACK, base station in the enhanced long-period evolution system

Technical field

The present invention relates to wireless communication technology field, transmission method, the base station of ACK/NACK in the particularly a kind of LTE-A system.

Background technology

(Hybrid Automatic Repeat reQuest HARQ) is a kind of packet retransmission mechanism of setting up in physical layer for the reliable transmission that ensures packet in the communication to mix automatic repeat requests.For example in the 3G standard that comprises WCDMA, TS-SCDMA and among HSUPA, the HSDPA, and the Long Term Evolution in the formulation standard (Long Term Evolution LTE) in the works, has adopted the HARQ technology.

The basic principle of HARQ is: the re-transmission of packet is carried out between transmitting terminal and receiving terminal, and one is the base station in transmitting terminal and the receiving terminal, and another is a terminal.Feedback message comprises correctly replys (ACK) and wrong responses (NACK).The packet that the receiving terminal receiving end/sending end is sent, if correct the reception, then feedback is correctly replied (ACK) message to transmitting terminal, show that current data packet correctly sends reception, and then transmitting terminal carries out the transmission of next packet; Do not receive if receiving terminal is correct, then feedback error is replied (NACK) message to transmitting terminal, and transmitting terminal can retransmit receiving terminal according to this message does not have the correct packet that receives.

Long Term Evolution (Long Term Evolution, LTE) in the system, the process of feeding back ACK/NACK can be as shown in Figure 1:

S110: Physical Resource Block (the Physical Resource Block that the base station can take by descending PDCCH channel indication uplink transmission data, PRB) demodulation reference mark of information and uplink (Demodulation Reference Symbol, information such as DMRS).

The PRB information that can take, in fact comprise the minimum PRB numbering that the data of follow-up uplink can take in all PRB, mean recipient's (here as terminal) in follow-up uplink transmission data process, transmit the data that need transmission from the place of this PRB numbering beginning.DMRS is similar to the Midamble sign indicating number in the TD-SCDMA system, is used for follow-up processing such as uplink channel estimation.The general corresponding basic DMRS sign indicating number in base station, and the DMRS that terminal adopts generally obtains after cyclic shift based on this basic DMRS sign indicating number.The DMRS information of the last indication of PDCCH, i.e. the circular shift information of the DMRS sign indicating number of indicating terminal subsequent transmission upstream data process employing.

The PRB information and the DMRS information of indication are generally indicated by DCI form 0, and promptly the base station PRB information of indicating uplink transmission data to take by the DCI form 0 among the PDCCH (is designated as I _{PRB_RA} ^Lowest_index) and DMRS information (be designated as n _DMRS) etc.

S120: terminal adopts Physical Uplink Shared Channel (Physical Uplink Sharing Channel, PUSCH) PRB as indicated and DMRS transmission data.

After the information such as PRB that terminal is indicated on the descending PDCCH in receiving aforementioned S110 and DMRS, the resource that begins from the minimum PRB that indicates on PUSCH is come transmit ascending data, and adopts the DMRS of indication.The front is mentioned DMRS and is used for uplink channel estimation, promptly after subsequent base stations receives the data that terminal transmits by PUSCH, utilizes DMRS to do channel estimating, and then the upstream data that could utilize the further demodulation of channel estimation results to send.

S130: after the base station receives the up data of sending, give terminal by PHICH channel feedback ACK/NACK.

The base station utilizes the feedback mechanism among the HARQ after receiving the data of transmitting on the PUSCH, if correctly receive data, then feeding back ACK information if can't correctly receive data, is then fed back nack message.The ACK/NACK information of feedback after processing such as modulation, spread spectrum and scrambling, is mapped to the transmitted over resources of PHICH channel.

The feedback ACK/NACK, take a part of resource on the PHICH, this part resource by parameter to (n _PHICH ^Group, n _PHICH ^Seq) indicate.N wherein _PHICH ^GroupThe numbering of the group that adopts among the expression PHICH, n _PHICH ^SeqRepresent the orthogonal sequence that adopts in the group.In fact, the resource that is used for transmitting among the PHICH is divided into different groups, is used for the group that transferring ACK/NACK adopted so need indicate; In the group, mutually orthogonal different sequences can be arranged, and can adopt one of them sequence to come transferring ACK/NACK, therefore, also need to indicate the group of employing.

n _PHICH ^GroupAnd n _PHICH ^SeqCalculate by following formula:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein:

N _PHICH ^GroupBe the number of the group of the PHICH in the current subframe, can dispose by high-level signaling;

N _SF ^PHICHThe size of the spreading factor when being the PHICH modulation;

I _{PRB_RA} ^Lowest_indexIt is the numbering of the PRB of the minimum in the resource indication in the DCI form 0;

n _DMRSBe the cyclic shift indication of the DMRS in the DCI form 0, its definition can be as shown in the table:

The cyclic shift of DMRS in the DCI form 0	n DMRS
		000	0
001	1
		010	2
011	3
		100	4
101	5
		110	6
111	7

Cyclic shift indication and the n of DMRS in the table 1.DCI form 0 _DMRSMapping relations

As seen, by top formula (1), can calculate to be used to indicate and be used for the parameter of resource of transferring ACK/NACK on the PHICH (n _PHICH ^Group, n _PHICH ^Seq).

Existing LTE with and the LTE-A technology in, the process of up PUSCH channel transmission data, comprise transmission block waiting for transmission (Transfer Block, TB) transmit (this TB is the data that will be transmitted in the MAC layer, and aforesaid PRB is the physical resource that is used for transmitting TB on the physical layer) by single stream.Up by single flow transmission, correspondingly, need the single DMRS of transmission.The cyclic shift of this DMRS, the n in the promptly top formula (1) _DMRS

In research and practice process to prior art, the inventor finds to exist in the prior art following problem:

In the prior art, only relate to up single-stream transmission, the DMRS of uplink also only needs one.Correspondingly, the resource on the shared PHICH of the ACK/NACK of downstream feedback is by being calculated by formula (1), by the cyclic shift indication n that comprises the DMRS correspondence that this is unique _DMRSDetermine, obtain a result.

But, in the prior art, also have the situation (being SU-MIMO) of up multithread transmission, not the corresponding different DMRS of homogeneous turbulence.And prior art has only provided the parameter of the resource of determining transferring ACK/NACK under the single current situation to (n _PHICH ^Group, n _PHICH ^Seq) mode, the parameter that does not provide under the multithread situation resource of determining transferring ACK/NACK is to (n _PHICH ^Group, n _PHICH ^Seq) mode, just do not have the scheme of feeding back ACK/NACK under the multithread situation yet.

Summary of the invention

The purpose of the embodiment of the invention provides transmission method, the base station of ACK/NACK in a kind of LTE-A system, to realize realizing feeding back ACK/NACK under the multithread situation.

For solving the problems of the technologies described above, the embodiment of the invention provides transmission method, the base station of ACK/NACK in a kind of LTE-A system to be achieved in that

The transmission method of ACK/NACK in a kind of LTE-A system is used the situation of single codeword multithread, comprising:

It is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of all streams to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

The transmission method of ACK/NACK is used the situation of many code words multithread in a kind of LTE-A system, comprising:

For each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

The ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

The transmission method of ACK/NACK is used the situation of many code words multithread in a kind of LTE-A system, comprising:

The ACK/NACK of many code words is merged;

It is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

The ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

A kind of base station is applied to the ACK/NACK feedback under the single codeword multithread situation, comprising:

Computing unit, it is right to be used for utilizing the cyclic shift indication of the predefined DMRS of DMRS of all streams to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element is used for feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

A kind of base station is applied to the ACK/NACK feedback under many code words multithread situation, comprising:

Computing unit, for each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element, the ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

A kind of base station is applied to the ACK/NACK feedback under many code words multithread situation, comprising:

Merge cells is with the ACK/NACK merging of many code words;

Computing unit, it is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element, the ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

The technical scheme that is provided by the above embodiment of the invention as seen, the invention provides the right method of resource of determining to be identified under single codeword multithread and the many code words multithread situation transferring ACK/NACK, thereby determined the resource on the PHICH of transferring ACK/NACK, and then realized feeding back ACK/NACK.

Description of drawings

Fig. 1 is the schematic flow sheet of feeding back ACK/NACK in the prior art;

Fig. 2 is that the code word-stream-DMRS in the embodiment of the invention concerns schematic diagram;

Fig. 3 is the transmission method flow chart of ACK/NACK under the single codeword multithread situation in the LTE-A system in the embodiment of the invention;

Fig. 4 is the transmission method flow chart of ACK/NACK under many code words multithread situation in the LTE-A system in one embodiment of the invention;

Fig. 5 is the transmission method flow chart of ACK/NACK under many code words multithread situation in the LTE-A system in another embodiment of the present invention;

Fig. 6 is the block diagram of the present invention one base station embodiment;

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

Embodiment

The embodiment of the invention provides transmission method, the base station of ACK/NACK in a kind of LTE-A system.

In order to make those skilled in the art person understand the present invention program better, the embodiment of the invention is described in further detail below in conjunction with drawings and embodiments.

At first instruction book code word and many code words.

Single codeword, corresponding with a TB that will transmit in the MAC layer, many code words, then corresponding with a plurality of TB that will transmit in the MAC layer.Briefly, if will transmit a TB in the MAC layer, then need single codeword, if need to transmit n TB in the MAC layer, then needing quantity is many code words of n.

For each TB, all need to feed back an ACK/NACK.That is to say that each code word all needs the feedback of an ACK/NACK.

As previously mentioned, multithread refers to the data flow of physical layer, and for example the data flow that can be a plurality of spatial reuses with a data flow point merges at the stream of receiving terminal to all spatial reuses, forms a partial data stream.

For the situation of single codeword, the up transmission that can have a plurality of data flow, then receiving terminal merges a plurality of data flow, and feeds back an ACK/NACK information.

For the situation of many code words, the wherein up transmission that can have a plurality of data flow of each code word, receiving terminal merges a plurality of data flow, and to ACK/NACK information of each code word feedback.

It is pointed out that all corresponding DMRS of each stream.

For foregoing, can show this example intuitively by a kind of situation among Fig. 2.

Below at first introduce in the LTE-A system transmission method of ACK/NACK under the single codeword multithread situation, Fig. 3 shows the flow chart of this embodiment, comprising:

S310: it is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of all streams to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel.

As previously mentioned, for the situation of single codeword, only need ACK/NACK of feedback to get final product, and the feedback of an ACK/NACK only need take a resource that is obtained by formula (1) and indicate (n _PHICH ^Group, n _PHICH ^Seq) to the indication resource.

For the situation of single codeword multithread, the corresponding DMRS of each stream.And each DMRS all to be basic DMRS obtain after unique a kind of cyclic shift, i.e. corresponding n of each DMRS _DMRS

And by formula (1) as can be known, a plurality of n _DMRS, may corresponding a plurality of n _PHICH ^GroupSo,, under the situation of multithread transmission, a plurality of resources that may calculate on the PHICH are indicated (n _PHICH ^Group, n _PHICH ^Seq), if promptly adopt the scheme of single current in the prior art, can obtain the resource that PHICH goes up a plurality of ACK/NACK of transmission, and this is as previously mentioned, is unnecessary.

Therefore, can be in the DMRS of all streams a predefined DMRS, the cyclic shift indication n that a DMRS of this appointment is corresponding _DMRSLike this, even multithread transmission, but for single codeword, still obtain the last resource of PHICH and be used for transferring ACK/NACK feedback, promptly feedback is still an ACK/NACK.

Concrete, can followingly calculate:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein, n _DMRSA predefined DMRS among the DMRS of corresponding all streams;

N _PHICH ^GroupIt is the number of the group of the PHICH in the current subframe;

N _SF ^PHICHThe size of the spreading factor when being the PHICH modulation;

I _{PRB_RA} ^Lowest_indexThe numbering of minimum PRB in the indication of expression resource;

Like this, by formula (2) even the unique resource indication that obtains multithread situation in the single codeword to (n _PHICH ^Group, n _PHICH ^Seq).

S320: feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

Follow-up, terminal can obtain the reception condition of this code word TB in base station side, thereby whether decision retransmits.

Below introduce in the LTE-A system transmission method embodiment of ACK/NACK under many code words situation, Fig. 4 shows the flow chart of this embodiment, comprising:

S410: for each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel.

As previously mentioned, for the situation of single codeword, only need ACK/NACK of feedback to get final product, and the feedback of an ACK/NACK only need take a resource that is obtained by formula (1) and indicate (n _PHICH ^Group, n _PHICH ^Seq) to the indication resource.

And many code words can be regarded the merging of a plurality of single codeword as.Therefore, the situation of many code words can be divided into many single codeword and handle.

Therefore, can be in the DMRS of each all stream of single codeword a predefined DMRS, the cyclic shift indication n that a DMRS of this appointment is corresponding _DMRSLike this, even multithread transmission, but for this single codeword, still obtain the last resource of PHICH and be used for transferring ACK/NACK feedback, promptly feedback is still an ACK/NACK.

Concrete, can followingly calculate:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein, n _PHICH ^GroupThe numbering of the group that adopts among the expression PHICH, n _PHICH ^SeqRepresent the orthogonal sequence that adopts in the group, (n _PHICH ^Group, n _PHICH ^Seq) to be the resource indication that is used for transferring ACK/NACK on the PHICH channel right;

n _DMRSA predefined DMRS among the DMRS of corresponding all streams of single codeword;

N _PHICH ^GroupIt is the number of the group of the PHICH in the current subframe;

N _SF ^PHICHThe size of the spreading factor when being the PHICH modulation;

I _{PRB_RA} ^Lowest_indexThe numbering of minimum PRB in the indication of expression resource;

Like this, obtain unique resource indication of a single codeword to (n by formula (3) _PHICH ^Group, n _PHICH ^Seq).

S420: the ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

Follow-up, terminal can obtain the reception condition of each code word TB in base station side, thereby whether decision retransmits.

Below introduce in the LTE-A system another transmission method embodiment of ACK/NACK under many code words situation, Fig. 5 shows the flow chart of this embodiment, comprising:

S510: the ACK/NACK of many code words is merged.

Among the aforementioned embodiment shown in Figure 4, for each code word, all according to embodiment feeding back ACK/NACK shown in Figure 3.

And in the present embodiment, be at first the ACK/NACK of many code words to be merged.ACK/NACK represents by binary word in transfer of data.For example ACK can be expressed as 0, and NACK can be designated 1.Different feedbacks can be operated by the logical AND of binary word and merged.Below be example with the simplest two code words, various situations are made an explanation:

A: for one of them code word, the content of feedback is NACK, be expressed as 0, and for another code word, the content of feedback also is NACK, also is expressed as 0, and then to carry out after the logical AND operation also be 0 to the ACK/NACK of two code words;

B: for one of them code word, the content of feedback is NACK, be expressed as 0, and for another code word, the content of feedback is ACK, is expressed as 1, and then to carry out after the logical AND operation also be 0 to the ACK/NACK of two code words;

C: for one of them code word, the content of feedback is ACK, be expressed as 1, and for another code word, the content of feedback also is ACK, also is expressed as 1, and then to carry out after the logical AND operation also be 1 to the ACK/NACK of two code words.

For the many code words more than two code words, the mode and the previous example that merge are similar, for example for three code words, are that the ACK/NACK with three feedbacks carries out the logical AND operation.

Value after this merges still can be with 0 expression NACK, with 0 expression ACK.Under this situation, merge 1 of back expression ACK, its implication is that all code words all correctly receive at receiving terminal, and actual conditions also to be each code word all correctly received.And the expression NACK 0, its implication is that all code words all do not have correct the reception at receiving terminal, although may being the part code word, actual conditions correctly do not received at receiving terminal, and other code word has still correctly been received, also may be that all code words are not all correctly received really, but after logical AND operation merging, will represent without exception that all code words are not all correctly received.

Like this, by the merging of above-mentioned logical AND, can be to a plurality of bits of the expression ACK/NACK of a plurality of code words feedback be merged into a bit, thus saved resource.

S520: it is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel.

For the situation of many code words multithread, all corresponding DMRS of each stream of each code word.And each DMRS all to be basic DMRS obtain after unique a kind of cyclic shift, i.e. corresponding n of each DMRS _DMRS

Therefore, can select a predefined code word in many code words, this predefined code word can be by base station and terminal agreement.In the DMRS of all streams of code word of this selection, select a predefined DMRS, the cyclic shift indication n that a DMRS of this appointment is corresponding _DMRSLike this, utilize this n _DMRSEven many code words multithread transmission still obtains the last resource of PHICH and is used for transferring ACK/NACK feedback.

Concrete, can followingly calculate:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein, n _PHICH ^GroupThe numbering of the group that adopts among the expression PHICH, n _PHICH ^SeqRepresent the orthogonal sequence that adopts in the group, (n _PHICH ^Group, n _PHICH ^Seq) to be the resource indication that is used for transferring ACK/NACK on the PHICH channel right;

n _DMRSA predefined DMRS among the DMRS of corresponding all streams of predetermined codeword;

N _PHICH ^GroupIt is the number of the group of the PHICH in the current subframe;

N _SF ^PHICHThe size of the spreading factor when being the PHICH modulation;

I _{PRB_RA} ^Lowest_indexThe numbering of minimum PRB in the indication of expression resource;

Like this, obtain unique resource indication of multithread situation in many code words to (n by formula (4) _PHICH ^Group, n _PHICH ^Seq).

S530: the ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

Still be illustrated in logical AND merging mode.For aforementioned merging back be the situation of ACK, represents that all code words are all correctly received, and actual conditions also to be each code word all correctly received, so after the ACK after will merging fed back to terminal, terminal did not need the TB of arbitrary code word is retransmitted.

And for the aforementioned situation of merging into NACK, although may being the part code word, actual conditions correctly do not received at receiving terminal, and other code word has still correctly been received, also may be that all code words are not all correctly received really, and after merging feedback here, represent without exception that all code words are not all correctly received.Like this, terminal can retransmit the TB of all code words after receiving the NACK feedback that merges expression.

Here embodiment illustrated in fig. 5 with respect to aforementioned embodiment shown in Figure 4, can only feed back an ACK/NACK indication for the situation of many code words multithread, transmit required resource thereby reduced.

By above-mentioned three embodiment as seen, the invention provides the right method of resource of determining to be identified under single codeword multithread and the many code words multithread situation transferring ACK/NACK, thereby determined the resource on the PHICH of transferring ACK/NACK, and then realized feeding back ACK/NACK.

Below introduce a base station embodiment of the present invention, the block diagram of this embodiment can be as shown in Figure 6, and the ACK/NACK feedback that it is applied under the single codeword multithread situation comprises:

Computing unit 61, it is right to be used for utilizing the cyclic shift indication of the predefined DMRS of DMRS of all streams to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element 62 is used for feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

Utilize this embodiment to realize the detailed process of feeding back, can be with reference to figure 3 pairing method embodiment.

Below introduce another base station embodiment of the present invention, the block diagram of this embodiment also can be as shown in Figure 6, and the ACK/NACK feedback that it is applied under many code words multithread situation comprises:

Computing unit 61, for each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element 62, the ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

Utilize this embodiment to realize the detailed process of feeding back, can be with reference to figure 4 pairing method embodiment.

Below introduce another base station embodiment of the present invention, the block diagram of this embodiment can be as shown in Figure 7, and the ACK/NACK feedback that it is applied under many code words multithread situation comprises:

Merge cells 71 is with the ACK/NACK merging of many code words;

Computing unit 72, it is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

Transmitting element 73, the ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

Utilize this embodiment to realize the detailed process of feeding back, can be with reference to figure 5 pairing method embodiment.

Though described the embodiment of the invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.

Claims (10)

1. the transmission method of ACK/NACK in the LTE-A system is used the situation of single codeword multithread, it is characterized in that, comprising:

It is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of all streams to determine to be used on the PHICH channel resource indication of transferring ACK/NACK;

Feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

2. the method for claim 1 is characterized in that, described definite indication is right, determines by following mode:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The numbering of the group that adopts among the expression PHICH,

Represent the orthogonal sequence that adopts in the group, (

) to be the resource indication that is used for transferring ACK/NACK on the PHICH channel right;

n _DMRSA predefined DMRS among the DMRS of corresponding all streams;

It is the number of the group of the PHICH in the current subframe;

The size of the spreading factor when being the PHICH modulation;

The numbering of minimum PRB in the indication of expression resource;

3. the transmission method of ACK/NACK in the LTE-A system is used the situation of many code words multithread, it is characterized in that, comprising:

For each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to determine to be used on the PHICH channel resource indication of transferring ACK/NACK;

The ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

4. method as claimed in claim 3 is characterized in that, described definite indication is right, determines by following mode:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein, The numbering of the group that adopts among the expression PHICH,

Represent the orthogonal sequence that adopts in the group, (

) to be the resource indication that is used for transferring ACK/NACK on the PHICH channel right;

n _DMRSA predefined DMRS among the DMRS of corresponding all streams of single codeword;

It is the number of the group of the PHICH in the current subframe;

The size of the spreading factor when being the PHICH modulation;

The numbering of minimum PRB in the indication of expression resource;

5. the transmission method of ACK/NACK in the LTE-A system is used the situation of many code words multithread, it is characterized in that, comprising:

The ACK/NACK of many code words is merged;

It is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to calculate the resource indication that is used for transferring ACK/NACK on the PHICH channel;

The ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

6. method as claimed in claim 5 is characterized in that, described ACK/NACK with many code words merges and comprises:

The ACK/NACK of many code words is merged by the logical AND operation.

7. method as claimed in claim 6 is characterized in that, it is characterized in that, described calculating indication is right, calculates by following mode:

$n_{\mathrm{PHICH}}^{\mathrm{group}}=(I_{\mathrm{PRB}\_\mathrm{RA}}^{\mathrm{lowest}\_\mathrm{index}}+n_{\mathrm{DMRS}})\mathrm{mod}{N}_{\mathrm{PHICH}}^{\mathrm{group}}+I_{\mathrm{PHICH}}{N}_{\mathrm{PHICH}}^{\mathrm{group}}$

Wherein,

The numbering of the group that adopts among the expression PHICH,

Represent the orthogonal sequence that adopts in the group, (

) to be the resource indication that is used for transferring ACK/NACK on the PHICH channel right;

n _DMRSA predefined DMRS among the DMRS of corresponding all streams of predetermined codeword;

It is the number of the group of the PHICH in the current subframe;

The size of the spreading factor when being the PHICH modulation;

The numbering of minimum PRB in the indication of expression resource;

8. a base station is applied to the ACK/NACK feedback under the single codeword multithread situation, it is characterized in that, comprising:

Computing unit, it is right to be used for utilizing the cyclic shift indication of the predefined DMRS of DMRS of all streams to determine to be used on the PHICH channel resource indication of transferring ACK/NACK;

Transmitting element is used for feeding back ACK/NACK on the described resource of PHICH is indicated indicated resource.

9. a base station is applied to the ACK/NACK feedback under many code words multithread situation, it is characterized in that, comprising:

Computing unit, for each code word, it is right to utilize the cyclic shift indication of the predefined DMRS among the DMRS of these all streams of code word to determine to be used on the PHICH channel to transmit the resource indication of AC K/NACK;

Transmitting element, the ACK/NACK of each code word correspondence of feedback on the corresponding resource of described each code word of PHICH is indicated indicated resource.

10. a base station is applied to the ACK/NACK feedback under many code words multithread situation, it is characterized in that, comprising:

Merge cells is with the ACK/NACK merging of many code words;

Computing unit, it is right to utilize the cyclic shift indication of a predefined DMRS among the DMRS of a predefined code word or arbitrary all streams of code word to determine to be used on the PHICH channel resource indication of transferring ACK/NACK;

Transmitting element, the ACK/NACK of the described merging of feedback on the described resource of PHICH is indicated indicated resource.

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