CN101841401B - Method for transmitting ACK/NACK in carrier aggregation system and base station - Google Patents

Abstract

The invention relates to a method for transmitting ACK/NACK in a carrier aggregation system and a base station. The method for transmitting the ACK/NACK in the carrier aggregation system comprises the following steps of: receiving data which is sent from an uplink through a PUSCH; and feeding the ACK/NACK back by a downlink PHICH, wherein the uplink member carriers in which the PUSCH is positioned and the downlink member carriers in which the PHICH is positioned have the following predefined corresponding relation that: the number of the uplink member carriers is set to be N, the number of the downlink member carriers is set to be M, and the number of the corresponding uplink member carriers in each downlink member carrier is set to be K, and the K is less than the N; the total set of the uplink member carriers is set to be SUL={1, 2, ..., N}; and the set of the corresponding uplink member carriers of the PHICH of the each downlink member carrier is set that SDL i: the number of the uplink member carriers is less than or equal to the K in SDL i, and i is equal to 1, 2, ..., M, and i is the No. of the downlink member carriers. Due to the adoption of the method, resource utilization can be saved on the basis of providing a certain UE-based PHICH flexible configuration.

Description

ACK/NACK transmission method and base station in carrier aggregation system

Technical field

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

Background technology

Carrier aggregation system is a kind of system that a plurality of carrier resource polymerizations (or claiming to connect) are got up to use.As just at developing enhancing Long Term Evolution (Long Term Evolution Advanced, LTE-A) system, it is in order to support the system bandwidth wider than LTE system, for example in order to support the bandwidth of 100MHz, the resource of a plurality of LTE carrier waves (or claiming member carrier) is coupled together use.Can bind these carrier waves as the whole bandwidth of system, distribute to a user or give a plurality of users, as shown in Figure 1.Like this, when using for a user, can provide higher peak rate.Concrete, can be that a plurality of continuous LTE carrier waves are carried out polymerization, can be also a plurality of discontinuous LTE carrier waves are carried out polymerization.

In carrier aggregation system, need to pass through Physical Downlink Control Channel (PhysicalDownlink Control CHannel on descending carrier, PDCCH) send the signaling indication, with Physical Uplink Shared Channel (the Physical Uplink Sharing CHannel to up-link carrier, PUSCH) resource on and transmission block attribute are indicated, afterwards, descendingly feed back the reception correctness by mixed automatic retransfer request (Hybrid Automatic RepeatreQuest, HARQ).

The basic principle of HARQ is: the re-transmission of packet is carried out between transmitting terminal and receiving terminal, and in transmitting terminal and receiving terminal, one is the base station, and another is 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, 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; If receiving terminal is correct the reception not, 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.

In the LTE-A system, the process of feeding back ACK/NACK can be as shown in Figure 2:

S210: Physical Resource Block (the Physical Resource Block that the base station can take by descending PDCCH channel indication uplink transmission data, PRB) information such as demodulation reference mark of information and uplink (Demodulation Reference Symbol, 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 from the place of this PRB numbering beginning the data that need transmission.DMRS is similar to the Midamble code in the TD-SCDMA system, is used for the follow-up processing such as uplink channel estimation.The general corresponding basic DMRS code in base station, and the DMRS that terminal adopts generally is based on this basic DMRS code and obtains after cyclic shift.The DMRS information of the upper indication of PDCCH, i.e. the circular shift information of the DMRS code of indicating terminal subsequent transmission upstream data process employing.

PRB information and the DMRS information of indication, general by DCI Downlink Control Information (DownlinkControl Information, DCI) form 0 is indicated, and namely the base station indicates the PRB information that uplink transmission data can take (to be designated as I by the DCI form 0 in PDCCH _{PRB_RA} ^Lowest_index) and DMRS information (be designated as n _DMRS) etc.

S220: terminal adopts Physical Uplink Shared Channel (Physical Uplink Sharing Channel, PUSCH) PRB and DMRS the transmission of data as indicated.

After the information such as the PRB that terminal is indicated on descending PDCCH in receiving aforementioned S210 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, namely 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.

S230: after the base station receives the up data of sending, by PHICH channel feedback ACK/NACK to terminal.

The base station utilizes the feedback mechanism in HARQ after receiving the data of transmitting on PUSCH, if correct receive data, feeding back ACK information is if correct receive data feeds back nack message.The ACK/NACK information of feedback after processing by modulation, spread spectrum and scrambling etc., is mapped to the transmitted over resources of PHICH channel.

The feedback ACK/NACK, take a part of resource on PHICH, this part resource by parameter to (n _PHICH ^Group, n _PHICH ^seq) indicate.N wherein _PHICH ^GroupThe numbering of the group that adopts in expression PHICH, n _PHICH ^GroupNumbering be from 0 to N _PHICH ^Group-1; n _PHICH ^seqThe index that represents the orthogonal sequence that adopts in a group.In fact, the resource that is used for transmitting in PHICH is divided into different groups, so need to indicate the group that transferring ACK/NACK adopts; In a 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 orthogonal sequence index 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 current subframe, can configure by high-level signaling;

The concept of PHICH group refers to the set of the elementary cell (Resource Element, RE) of one group of resource, can transmit 8 PHICH channels in the set of this RE, and each PHICH interchannel is distinguished by orthogonal sequence.For regular circulation prefix (Normal CP (Cyclic Prefix)), 8 orthogonal sequences can be arranged, in a PHICH group, 8 PHICH channels are arranged so; For extended cyclic prefix (Extended CP), 4 orthogonal sequences can be arranged, in a PHICH group, 4 PHICH channels are arranged so.

For FDD system, N _PHICH ^GroupFix in all subframes, and pass through following formula:

N _SF ^PHICHThe size of the spreading factor during expression PHICH modulation;

N wherein _g{ 1/6,1/2,1,2} can be provided by high level ∈, N _RB ^DLCan calculate by the downlink bandwidth information in broadcasting and obtain;

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

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

The cyclic shift of DMRS in 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 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 PHICH to (n _PHICH ^Group, n _PHICH ^seq).

In discussion about the LTE-A system, a kind of PHICH transmission plan based on user terminal (User Equipment, UE) as shown in the example in Fig. 3 has been proposed at present.As shown in Figure 3, in this scheme, show the situation of 3 uplink member carrier and 3 downlink member carriers.Remain in advance the PHICH resource that the PUSCH of all uplink member carrier replys in each downlink member carrier.For example, in downlink member carrier 1, for the PUSCH in uplink member carrier 1,2,3 remains for the PHICH resource that ACK/NACK replys in advance; In downlink member carrier 2, equally also remain in advance for the PUSCH in uplink member carrier 1,2,3 the PHICH resource that ACK/NACK replys; In downlink member carrier 3, equally also remain in advance for the PUSCH in uplink member carrier 1,2,3 the PHICH resource that ACK/NACK replys.

The situation of example as shown in Figure 3, if UE only with the transmission of the PUSCH on uplink member carrier 1, needing in system so is that 1 PUSCH reserves 3 parts of PHICH resources.

As seen, in existing scheme, to remain in advance for the PUSCH of all uplink member carrier the PHICH resource that ACK/NACK replys on each downlink member carrier.And significantly, such mode has caused the larger waste of resource.

Summary of the invention

The purpose of the embodiment of the present invention is to provide ACK/NACK transmission method and the base station in a kind of carrier aggregation system, with saving resource.

For solving the problems of the technologies described above, the embodiment of the present invention provides ACK/NACK transmission method and the base station in a kind of carrier aggregation system to be achieved in that

ACK/NACK transmission method in a kind of carrier aggregation system comprises:

Receive the up data of sending by PUSCH;

By descending PHICH feeding back ACK/NACK;

Wherein, the downlink member carrier at the uplink member carrier at described PUSCH place and described PHICH place has following predefined corresponding relation:

If the number of uplink member carrier is N, the number of downlink member carrier is M, and in each downlink member carrier, the number of corresponding uplink member carrier is K, K＜N;

Total set of uplink member carrier is made as S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding is made as S _DL ⁱ:

S _DL ⁱThe number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}};$

I=1 wherein, 2 ..., M, i represent the numbering of downlink member carrier.

A kind of base station comprises:

Receiving element is used for receiving the up data of sending by PUSCH;

Feedback unit is used for by descending PHICH feeding back ACK/NACK;

Wherein, the downlink member carrier at the uplink member carrier at described PUSCH place and described PHICH place has following predefined corresponding relation:

If the number of uplink member carrier is N, the number of downlink member carrier is M, and in each downlink member carrier, the number of corresponding uplink member carrier is K, K＜N;

Total set of uplink member carrier is made as S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding is made as S _DL ⁱ:

S _DL ⁱThe number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}};$

I=1 wherein, 2 ..., M, i represent the numbering of downlink member carrier.

The technical scheme that is provided by the above embodiment of the present invention as seen, only predefined downlink member carrier remains for for the PUSCH of corresponding uplink member carrier the PHICH resource that ACK/NACK replys in advance, rather than remain in advance for the PUSCH of all uplink member carrier the PHICH resource that ACK/NACK replys on each downlink member carrier, therefore can be on the basis that certain PHICH flexible configuration based on UE is provided, saving resource.

Description of drawings

Fig. 1 is the principle schematic of carrier aggregation system;

Fig. 2 is the method flow diagram of a kind of feeding back ACK/NACK in prior art;

Fig. 3 is the PHICH transmission plan schematic diagram based on user terminal of the prior art;

Fig. 4 be in prior art the downlink member carrier number greater than the schematic diagram of uplink member carrier number situation;

Fig. 5 be in prior art the downlink member carrier number less than the schematic diagram of uplink member carrier number situation;

Fig. 6 is the flow chart of an embodiment of the ACK/NACK transmission method in carrier aggregation system of the present invention;

Fig. 7 principle schematic that to be the present invention realize in one embodiment according to the method for Fig. 6;

The block diagram of Fig. 8 the present invention one base station embodiment.

Embodiment

The embodiment of the present invention provides ACK/NACK transmission method and the base station in a kind of carrier aggregation system.

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

The embodiments of the invention that the following describes need PHICH in the predefine downlink member carrier and the corresponding relation of uplink member carrier.

At first need to prove, the example in earlier figures 3 only shows the situation that comprises 3 uplink member carrier and 3 downlink member carriers, i.e. uplink member carrier situation about equating with the number of downlink member carrier.In fact, the situation that also exists the number of uplink member carrier and downlink member carrier not wait.As shown in Figure 4, show the downlink member carrier number greater than the uplink member carrier number; As shown in Figure 5, show the downlink member carrier number less than the uplink member carrier number.

The embodiment of the present invention goes for above-mentioned arbitrary situation.

Corresponding relation about the PHICH in the predefine downlink member carrier and uplink member carrier, here, the number that can establish uplink member carrier is N, and the number of downlink member carrier is M, the number that limits uplink member carrier corresponding in each downlink member carrier is K, and K＜N.On the other hand, total set of uplink member carrier is S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding can be made as S _DL ⁱ, i=1 wherein, 2 ..., M, i can represent the numbering of downlink member carrier, wherein:

S _DL ⁱThe number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}}.$

These predefine relations here can be notified to UE by the base station by high-level signaling or system broadcasts.

Based on above-mentioned predefined corresponding relation, ACK/NACK transmission method one embodiment in carrier aggregation system of the present invention, shown in Figure 6, can comprise:

S610: receive the up data of sending by PUSCH.

S620: by descending PHICH feeding back ACK/NACK.

Wherein, described PUSCH place uplink member carrier and PHICH place downlink member carrier satisfy aforementioned predefined corresponding relation.

The descending PHICH that adopts in S620 can be the PUSCH corresponding PHICH in predefined corresponding relation in described S610, can be also the PUSCH corresponding several PHICH in predefined corresponding relation in described S610.

This PHICH, concrete, can configure in conjunction with the setting of main carrier, can be also and the PHICH that dispatches on the PDCCH same carrier wave.Say that accurately the downlink member carrier at PHICH place can be determined in the following way: in the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, the downlink member carrier that configures in conjunction with the setting of main carrier.The downlink member carrier at PHICH place also can comprise: in the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, and the downlink member carrier at the PDCCH place of the described PUSCH of scheduling.

In the embodiment of the present invention shown in Figure 6, only predefined downlink member carrier remains for for the PUSCH of corresponding uplink member carrier the PHICH resource that ACK/NACK replys in advance, rather than remain in advance for the PUSCH of all uplink member carrier the PHICH resource that ACK/NACK replys on each downlink member carrier, therefore, with respect to prior art, can saving resource.

The up data of sending by PUSCH in S610, the resource that the transmission of these data is shared can be determined by the information of notifying before.Determine the resource that can take in up PUSCH as the information such as demodulation reference mark of the PRB information that can take by descending PDCCH channel indication uplink transmission data before the base station and uplink.

PRB information comprises the minimum PRB numbering that the data transmitted in up PUSCH can take in all PRB, the up PUSCH the transmission of data of terminal needs the data of transmission from the place transmission of this PRB numbering beginning.DMRS is used for the follow-up processing such as uplink channel estimation.The general corresponding basic DMRS code in base station, and the DMRS that terminal adopts generally is based on this basic DMRS code and obtains after cyclic shift.The DMRS information of the upper indication of PDCCH, i.e. the circular shift information of the DMRS code of indicating terminal subsequent transmission upstream data process employing.

PRB information and the DMRS information of indication are generally indicated by DCI form 0, and namely the base station indicates the PRB information that uplink transmission data can take (to be designated as I by the DCI form 0 in PDCCH _{PRB_RA} ^Lowest_index) and DMRS information (be designated as n _DMRS) etc.

The PHICH of the ACK/NACK information of feeding back by downlink bearing in S620, for the PUSCH transmission of dispatching in subframe n, UE determines at subframe n+k _PHICHIn the PHICH resource of correspondence, the FDD k of system wherein _PHICH=4, for TDD system, k _PHICHBy following form:

Table 2.k _PHICHAllocation list

By the ACK/NACK of descending PHICH feedback, take a part of resource on PHICH in S620.The resource that this takies, the resource of PHICH channel are that the cyclic shift of the uplink demodulation reference symbol (DMRS) of PRB sequence number minimum in the resource of distributing of the row according to the PUSCH transmission permission indicating in the DCI form 0 of PDCCH and 3bits indication determines jointly.

Resource on the shared PHICH of ACK/NACK by downstream feedback in S620, concrete, as previously mentioned, mainly by parameter to (n _PHICH ^Group, n _PHICH ^seq) indication.

N wherein _PHICH ^GroupThe numbering of the group that adopts in expression PHICH, n _PHICH ^GroupNumbering be from 0 to N _PHICH ^Group-1; n _PHICH ^seqThe index that represents the orthogonal sequence that adopts in a group.

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 current subframe, can configure by high-level signaling;

N _SF ^PHICHThe size of the spreading factor during expression PHICH modulation;

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

n _DMRSBe the cyclic shift indication of the DMRS in DCI form 0, its definition can be as shown in aforementioned table 1.

In the present embodiment, N _PHICH ^GroupCan draw by following formula:

N wherein _g{ 1/6,1/2,1,2} can be provided by high level ∈;

N _RB ^DLCan calculate by the downlink bandwidth information in broadcasting and obtain.

In addition, N _gCan also independently determine according to the set of the uplink member carrier that in current each downlink member carrier, PHICH is corresponding:

$N_g=N_{j,g}=\frac{\underset{i}{\mathrm{\Σ}}{N}_{j,i,\mathrm{RB}}^{\mathrm{UL}}}{N_{j,\mathrm{RB}}^{\mathrm{DL}}}---\left(2\right)$

Wherein:

N _{J, i, RB} ^ULExpression be the number of the PRB that transmits for up PUSCH in i uplink member carrier in the set of the uplink member carrier that in j downlink member carrier, PHICH is corresponding;

N _{J, RB} ^DLWhat represent is the PRB number of j downlink member carrier.

The set of the uplink member carrier that in downlink member carrier, PHICH is corresponding can be as described in front predefined corresponding relation.

In addition, described N _g, can also be through the N after quantizing _g, also be used for the calculating of PHICH group.Here said quantification, be consider if with LTE in the definition of Ng compatible, can be so that the N after being calculated by formula (2) _gWith the N in LTE _gValue relatively, fall into which interval, just adopt which N _gBe configured.Like this, can be on the basis that certain PHICH flexible configuration based on UE is provided, the saving resource expense.

In addition, in the embodiment of the present invention, can also be according to the set of the uplink member carrier that in each downlink member carrier, PHICH is corresponding, the numbering of the PRB of the uplink member carrier that set is interior couples together, afterwards, adopt described parameter the upper resource of the PHICH of indication to be transmitted the ACK/NACK of feedback, wherein the resource of parameter to indication, be corresponding resource after the PRB numbering couples together.

For example: the PRB number for uplink member carrier 2 is A, its PRB is numbered 0～A-1, PRB number for uplink member carrier 3 is M, its PRB is numbered A～A+M-1, obtained the resource of the upper transmission of PHICH ACK/NACK by the right account form of described indication, account form is with described formula:

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

Different is, I wherein _{PRB_RA} ^Lowest_indexWhat indicate is after the PRB numbering couples together, the PRB numbering of the minimum that represents on the PRB of this connection resource.

Like this, can be on the basis that certain PHICH flexible configuration based on UE is provided, saving resource.

Below provide the example of a specific implementation of the above embodiment of the present invention.Fig. 7 shows the schematic diagram of this object lesson.

As shown in Figure 7, in this example, system comprises 3 uplink member carrier and 3 downlink member carriers.To PHICH in downlink member carrier and uplink member carrier predefine relation, can for:

Limiting maximum two uplink member carrier can be corresponding with the PHICH of a downlink member carrier.Be specifically as follows:

The corresponding downlink member carrier 1 of uplink member carrier 1 and 2 set, $S_{\mathrm{DL}}^1=\left\{\mathrm{1,2}\right\};$

The corresponding downlink member carrier 2 of uplink member carrier 2 and 3 set, $S_{\mathrm{DL}}^2=\left\{\mathrm{2,3}\right\};$

The corresponding downlink member carrier 3 of uplink member carrier 1 and 3 set, $S_{\mathrm{DL}}^3=\left\{\mathrm{3,1}\right\}.$

These information can be notified to UE by system broadcast message or high-level signaling.

Restrictive condition above satisfying for the PUSCH on uplink member carrier 1,2,3, provides the corresponding relation based on the PHICH flexibly of UE.

Like this, the base station receives the up data of sending by PUSCH, and afterwards by descending PHICH feeding back ACK/NACK, the downlink member carrier at the uplink member carrier at the PUSCH place in this process and PHICH place meets predefined corresponding relation.

For example, for uplink member carrier 1, according to predefined corresponding relation, can adopt downlink member carrier 1 or downlink member carrier 3.Like this, if terminal sends data by the PUSCH on uplink member carrier 1, after these data are received in the base station, can come feeding back ACK/NACK by the PHICH on downlink member carrier 1 or downlink member carrier 3.And downlink member carrier 2, due to not in the uplink member carrier of predefined downlink member carrier 1 correspondence, therefore, needn't be preserved for the data of transmitting for uplink member carrier 1 on this downlink member carrier 2 and feed back needed resource, also just can save the resource of this downlink member carrier 2.

Again for example, for uplink member carrier 2, according to predefined corresponding relation, can adopt downlink member carrier 1 or downlink member carrier 2.Like this, if terminal sends data by the PUSCH on uplink member carrier 1, after these data are received in the base station, can come feeding back ACK/NACK by the PHICH on downlink member carrier 1 or downlink member carrier 2.And downlink member carrier 3, due to not in the uplink member carrier of predefined downlink member carrier 2 correspondences, therefore, needn't be preserved for the data of transmitting for uplink member carrier 1 on this downlink member carrier 3 and feed back needed resource, also just can save the resource of this downlink member carrier 3.

Again for example, for uplink member carrier 3, according to predefined corresponding relation, can adopt downlink member carrier 2 or downlink member carrier 3.Like this, if terminal sends data by the PUSCH on uplink member carrier 3, after these data are received in the base station, can come feeding back ACK/NACK by the PHICH on downlink member carrier 2 or downlink member carrier 3.And downlink member carrier 1, due to not in the uplink member carrier of predefined downlink member carrier 3 correspondences, therefore, needn't be preserved for the data of transmitting for uplink member carrier 3 on this downlink member carrier 1 and feed back needed resource, also just can save the resource of this downlink member carrier 1.

As seen, in this object lesson, reserve the PHICH resource of uplink member carrier 1 and 2 in downlink member carrier 1, reserved the PHICH resource of uplink member carrier 2 and 3 in downlink member carrier 2, reserved the PHICH resource of uplink member carrier 1 and 3 in downlink member carrier 3.If UE can for this 1 PUSCH reserves 2 parts of PHICH resources at the most, namely reserve for 2 parts of PHICH resources on downlink member carrier 1 and downlink member carrier 3 in system at the most only with the transmission of the PUSCH on uplink member carrier 1.Rather than be all that this PUSCH reserves resource in all downlink member carriers, therefore, with respect to prior art, can saving resource.

Difference according to the uplink member carrier of the transmission of data, the difference that comprises quantity, for example terminal adopts the uplink member carrier of polymerization to come the transmission of data, correspondingly, the descending PHICH that adopts, can be the PUSCH PHICH in a corresponding downlink member carrier in predefined corresponding relation on uplink member carrier, can be also PUSCH PHICH in corresponding several downlink member carriers in predefined corresponding relation.

as up the transmission of data, transmit by the PUSCH on the PUSCH on uplink member carrier 1 and uplink member carrier 2, correspondingly, can be adopt uplink member carrier 1 and uplink member carrier 2 in predefined corresponding relation jointly the PHICH on corresponding downlink member carrier 1 come feeding back ACK/NACK, can be also, data for the transmission of the PUSCH on uplink member carrier 1, adopt the PHICH on downlink member carrier 1 to come feeding back ACK/NACK, data for the transmission of the PUSCH on uplink member carrier 2, adopt the PHICH on downlink member carrier 2 to come feeding back ACK/NACK.

According to example shown in Figure 7, transmit by the PUSCH on the PUSCH on uplink member carrier 2 and uplink member carrier 3, perhaps transmit by the PUSCH on the PUSCH on uplink member carrier 1 and uplink member carrier 3, the downlink member carrier of corresponding employing, mode that can be similar to the above is determined.

For the common the transmission of data of PUSCH that adopts on uplink member carrier 1,2,3, be about to the situation that uplink member carrier 1,2,3 polymerizations get up to use, the downlink member carrier that adopts of feeding back ACK/NACK, can determine more flexibly.For example, can be according to predefined corresponding relation, by the PHICH on downlink member carrier 1, the data of transmission on uplink member carrier 1 and 2 are fed back, and adopted downlink member carrier 3 that the data of transmission on uplink member carrier 3 are fed back.Or, according to predefined corresponding relation, by the PHICH on downlink member carrier 2, the data of transmission on uplink member carrier 2 and 3 are fed back, and adopted downlink member carrier 1 that the data of transmission on uplink member carrier 1 are fed back.Or, according to predefined corresponding relation, by the PHICH on downlink member carrier 3, the data of transmission on uplink member carrier 1 and 3 are fed back, and adopted downlink member carrier 2 that the data of transmission on uplink member carrier 2 are fed back.Also have other combined situation, exemplify no longer one by one.The perhaps mode of a kind of 1 pair 1, according to predefined corresponding relation, by the PHICH on downlink member carrier 1, the data of transmission on uplink member carrier 1 are fed back, adopt downlink member carrier 2 that the data of transmission on uplink member carrier 2 are fed back, adopt downlink member carrier 3 that the data of transmission on uplink member carrier 3 are fed back.

In any case, aforesaid way, reserved the PHICH resource of feeding back for to uplink member carrier 1 and 2 in downlink member carrier 1, reserve the PHICH resource of feeding back for to uplink member carrier 2 and 3 in downlink member carrier 2, reserved the PHICH resource of feeding back for uplink member carrier 1 and 3 in downlink member carrier 3.All remain in advance the mode of PHICH resource that all uplink member carrier are fed back with respect to each downlink member carrier in prior art, can reduce the consumption of resource, thus can saving resource.

The PHICH that adopts, concrete, can configure by high level, configure as the setting in conjunction with main carrier.Another kind of situation can be also and the PHICH that dispatches on the PDCCH same carrier wave.For the former, for example adopt downlink member carrier 1 as main carrier in system, in order to alleviate the signaling burden on main carrier, can preferably adopt the downlink member carrier of non-main carrier to feed back, or be in unified and purpose that be convenient to manage concentratedly, can preferably adopt the downlink member carrier of main carrier to feed back, as seen, this depends on the different purposes of system.Situation for the latter, for example, for adopting the PUSCH on uplink member carrier 1 to come the transmission of data, and this PUSCH is dispatched by the PDCCH on 1 on downlink member carrier, can still adopt the PHICH on this downlink member carrier 1 to feed back, namely with the PHICH that dispatches the PDCCH same carrier wave.

As for being used for the shared PHICH resource of feeding back ACK/NACK on downlink member carrier, namely the parameter of indexed resource is to (n _PHICH ^Group, n _PHICH ^seq), still can adopt the mode in aforementioned formula (1) to obtain.N in formula (1) _PHICH ^Group, as previously mentioned, can draw by following formula:

N wherein _g{ 1/6,1/2,1,2} can be provided by high level ∈;

N _RB ^DLCan calculate by the downlink bandwidth information in broadcasting and obtain.

In addition, N _gCan also independently determine according to the set of the uplink member carrier that in current each downlink member carrier, PHICH is corresponding:

$N_g=N_{j,g}=\frac{\underset{i}{\mathrm{\Σ}}{N}_{j,i,\mathrm{RB}}^{\mathrm{UL}}}{N_{j,\mathrm{RB}}^{\mathrm{DL}}}---\left(2\right)$

Wherein:

N _{J, i, RB} ^ULExpression be the number of the PRB that transmits for up PUSCH in i uplink member carrier in the set of the uplink member carrier that in j downlink member carrier, PHICH is corresponding;

N _{J, RB} ^DLWhat represent is the PRB number of j downlink member carrier.

In addition, in the formula (1) that adopts, can also be according to the set of the uplink member carrier that in each downlink member carrier, PHICH is corresponding, the numbering of the PRB of the uplink member carrier that set is interior couples together, afterwards, adopt described parameter the upper resource of the PHICH of indication to be transmitted the ACK/NACK of feedback, wherein the resource of parameter to indication, be corresponding resource after the PRB numbering couples together.For example: the PRB number for uplink member carrier 2 is A, its PRB is numbered 0～A-1, PRB number for uplink member carrier 3 is M, its PRB is numbered A～A+M-1, obtained the resource of the upper transmission of PHICH ACK/NACK by the right account form of described indication, account form is with described 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, I _{PRB_RA} ^Lowest_indexIndication be the PRB numbering of minimum indicated after PRB numbering couples together.

The situation of the polymerization carrier wave that no matter adopts for uplink transmission data does not still adopt the situation of polymerization carrier wave, can be drawn by this formula.

Below introduce the embodiment of the present invention one base station, Fig. 8 shows the block diagram of this base station embodiment, as shown in Figure 9, comprising:

Receiving element 81 is used for receiving the up data of sending by PUSCH;

Feedback unit 82 is used for by descending PHICH feeding back ACK/NACK;

Wherein, the downlink member carrier at the uplink member carrier at described PUSCH place and described PHICH place has following predefined corresponding relation:

If the number of uplink member carrier is N, the number of downlink member carrier is M, and in each downlink member carrier, the number of corresponding uplink member carrier is K, K＜N;

Total set of uplink member carrier is made as S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding is made as S _DL ⁱ:

S _DL ⁱThe number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}};$

I=1 wherein, 2 ..., M, i represent the numbering of downlink member carrier.

Preferably, the downlink member carrier at described PHICH place is:

In the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, the downlink member carrier that configures in conjunction with the setting of main carrier.

Preferably, the downlink member carrier at described PHICH place comprises:

In the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, the downlink member carrier at the PDCCH place of the described PUSCH of scheduling.

Preferably, the resource on the shared described PHICH of the ACK/NACK of described feedback, by parameter to (n _PHICH ^Group, n _PHICH ^seq) indication, wherein n _PHICH ^GroupThe numbering of the group that adopts in expression PHICH, n _PHICH ^GroupNumbering be from 0 to N _PHICH ^Group-1; n _PHICH ^seqThe index that represents the orthogonal sequence that adopts in a group;

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 current subframe, configure by high-level signaling;

N _SF ^PHICHThe size of the spreading factor during expression PHICH modulation;

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

n _DMRSIt is the cyclic shift indication of the DMRS in DCI form 0.

Preferably, N _PHICH ^GroupBy determining by following formula:

N wherein _g{ 1/6,1/2,1,2} is provided by high level ∈;

N _RB ^DLCalculate by the downlink bandwidth information in broadcasting and obtain.

Preferably, N _PHICH ^GroupBy determining by following formula:

Wherein:

N _RB ^DLCalculate by the downlink bandwidth information in broadcasting and obtain;

N _gIndependently determined by following formula according to the set of the uplink member carrier that in current each downlink member carrier, PHICH is corresponding:

$N_g=N_{j,g}=\frac{\underset{i}{\mathrm{\Σ}}{N}_{j,i,\mathrm{RB}}^{\mathrm{UL}}}{N_{j,\mathrm{RB}}^{\mathrm{DL}}}$

Wherein:

N _{J, i, RB} ^ULThe number that represents in the set of the uplink member carrier that in j downlink member carrier, PHICH is corresponding the PRB that is used for up PUSCH transmission in i uplink member carrier;

N _{J, RB} ^DLThe PRB number that represents j downlink member carrier.

Preferably, it is characterized in that described I _{PRB_RA} ^Lowest_indexThe minimum PRB of indication is numbered the PRB numbering of PRB numbering indicated minimum after coupling together.

Utilize above-mentioned base station embodiment to carry out the method for ACK/NACK transmission in carrier aggregation system, embodiment is similar with preceding method, does not repeat them here.

Although described the embodiment of the present 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 ACK/NACK transmission method in a carrier aggregation system, is characterized in that, comprising:

Receive the up data of sending by PUSCH;

By descending PHICH feeding back ACK/NACK;

Wherein, the downlink member carrier at the uplink member carrier at described PUSCH place and described PHICH place has following predefined corresponding relation:

If the number of uplink member carrier is N, the number of downlink member carrier is M, and in each downlink member carrier, the number of corresponding uplink member carrier is K, K＜N;

Total set of uplink member carrier is made as S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding is made as

:

The number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}};$

I=1 wherein, 2 ..., M, i represent the numbering of downlink member carrier;

Particularly, described predefined corresponding relation is notified to user terminal by the base station by high-level signaling or system broadcasts;

The downlink member carrier at described PHICH place is determined in the following way: according to the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, and the downlink member carrier that configures in conjunction with the setting of main carrier;

Perhaps, the downlink member carrier at described PHICH place comprises: according to the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, and the downlink member carrier at the PDCCH place of the described PUSCH of scheduling.

2. the method for claim 1, is characterized in that, the resource on the shared described PHICH of the ACK/NACK of described feedback is by parameter pair

Indication, wherein

The numbering of the group that adopts in expression PHICH, Numbering be from 0 to

The index that represents the orthogonal sequence that adopts in a group;

With Calculate 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:

Be the number of the group of the PHICH in current subframe, configure by high-level signaling;

The size of the spreading factor during expression PHICH modulation;

The numbering of the PRB of the minimum in the resource indication in expression DCI form 0;

n _DMRSIt is the cyclic shift indication of the DMRS in DCI form 0.

3. method as claimed in claim 2, is characterized in that,

Determine by following formula:

N wherein _g{ 1/6,1/2,1,2} is provided by high level ∈;

Calculate by the downlink bandwidth information in broadcasting and obtain.

4. method as claimed in claim 2, is characterized in that,

Determine by following formula:

Wherein:

Calculate by the downlink bandwidth information in broadcasting and obtain;

N _gIndependently determined by following formula according to the set of the uplink member carrier that in current each downlink member carrier, PHICH is corresponding:

$N_g=N_{j,g}=\frac{\underset{i}{\mathrm{\Σ}}{N}_{j,i,\mathrm{RB}}^{\mathrm{UL}}}{N_{j,\mathrm{RB}}^{\mathrm{DL}}}$

Wherein:

The number that represents in the set of the uplink member carrier that in j downlink member carrier, PHICH is corresponding the PRB that is used for up PUSCH transmission in i uplink member carrier;

The PRB number that represents j downlink member carrier.

5. method as claimed in claim 2, is characterized in that, and is described The minimum PRB of indication is numbered the PRB numbering of PRB numbering indicated minimum after coupling together.

6. a base station, is characterized in that, comprising:

Receiving element is used for receiving the up data of sending by PUSCH;

Feedback unit is used for by descending PHICH feeding back ACK/NACK;

Wherein, the downlink member carrier at the uplink member carrier at described PUSCH place and described PHICH place has following predefined corresponding relation:

If the number of uplink member carrier is N, the number of downlink member carrier is M, and in each downlink member carrier, the number of corresponding uplink member carrier is K, K＜N;

Total set of uplink member carrier is made as S _UL=1,2 ..., N}, the set of the uplink member carrier that the PHICH of each downlink member carrier is corresponding is made as

:

The number of middle uplink member carrier is less than or equal to K;

$S_{\mathrm{DL}}^1\∪S_{\mathrm{DL}}^2\∪\·\·\·\·\·\·\∪S_{\mathrm{DL}}^M=S_{\mathrm{UL}};$

I=1 wherein, 2 ..., M, i represent the numbering of downlink member carrier;

Particularly, described predefined corresponding relation is notified to user terminal by the base station by high-level signaling or system broadcasts;

The downlink member carrier at described PHICH place is: according to the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, and the downlink member carrier that configures in conjunction with the setting of main carrier;

Perhaps, the downlink member carrier at described PHICH place comprises: according to the corresponding downlink member carrier of PUSCH place uplink member carrier described in described corresponding relation, and the downlink member carrier at the PDCCH place of the described PUSCH of scheduling.

7. base station as claimed in claim 6, is characterized in that, the resource on the shared described PHICH of the ACK/NACK of described feedback is by parameter pair Indication, wherein

The numbering of the group that adopts in expression PHICH,

Numbering be from 0 to

The index that represents the orthogonal sequence that adopts in a group;

With

Calculate 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:

Be the number of the group of the PHICH in current subframe, configure by high-level signaling;

The size of the spreading factor during expression PHICH modulation;

The numbering of the PRB of the minimum in the resource indication in expression DCI form 0;

n _DMRSIt is the cyclic shift indication of the DMRS in DCI form 0.

8. base station as claimed in claim 7, is characterized in that,

Determine by following formula:

N wherein _g{ 1/6,1/2,1,2} is provided by high level ∈;

Calculate by the downlink bandwidth information in broadcasting and obtain.

9. base station as claimed in claim 7, is characterized in that,

Determine by following formula:

Wherein:

Calculate by the downlink bandwidth information in broadcasting and obtain;

N _gIndependently determined by following formula according to the set of the uplink member carrier that in current each downlink member carrier, PHICH is corresponding:

$N_g=N_{j,g}=\frac{\underset{i}{\mathrm{\Σ}}{N}_{j,i,\mathrm{RB}}^{\mathrm{UL}}}{N_{j,\mathrm{RB}}^{\mathrm{DL}}}$

Wherein:

The number that represents in the set of the uplink member carrier that in j downlink member carrier, PHICH is corresponding the PRB that is used for up PUSCH transmission in i uplink member carrier;

The PRB number that represents j downlink member carrier.

10. base station as claimed in claim 7, is characterized in that, and is described

The minimum PRB of indication is numbered the PRB numbering of PRB numbering indicated minimum after coupling together.

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