CN101841401A - 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: the number of the uplink member carriers is less than or equal to the K, 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 the carrier aggregation system

Technical field

The present invention relates to wireless communication technology field, ACK/NACK transmission method and base station in particularly 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 wideer 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 the whole bandwidth of these carrier waves, distribute to a user or give a plurality of users, as shown in Figure 1 as system.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, also can be a plurality of discontinuous LTE carrier waves are carried out polymerization.

In the carrier aggregation system, need on descending carrier, pass through Physical Downlink Control Channel (Physical Downlink Control CHannel, PDCCH) send the signaling indication, with Physical Uplink Shared Channel (Physical Uplink Sharing CHannel to up-link carrier, PUSCH) resource on and transmission block attribute are indicated, it is afterwards, descending that (Hybrid Automatic Repeat reQuest HARQ) feeds back the reception correctness by mixing automatic repeat requests.

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.

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) 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 is based on this basic DMRS sign indicating number and obtains after cyclic shift.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, general by DCI Downlink Control Information (Downlink Control Information, DCI) form 0 is indicated, 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

) and DMRS information (be designated as n _DMRS) etc.

S220: 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 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, 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.

S230: 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 ACK/NACK of feedback takies a part of resource on the PHICH, and this part resource is right by parameter

Indicate.Wherein

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

Numbering be from 0 to

The index of representing 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 orthogonal sequence index of employing.

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 the current subframe, can dispose by high-level signaling;

The notion of PHICH group is meant that (Resource Element, set RE) can be transmitted 8 PHICH channels in the set of this RE, each PHICH interchannel is distinguished by orthogonal sequence for the elementary cell of one group of resource.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 the FDD system,

In all subframes, fix, and provide by following formula:

The size of the spreading factor during expression PHICH modulation;

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

Can obtain by the downlink bandwidth information calculations in the broadcasting;

The numbering of the PRB of the minimum in the resource indication in the expression 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 and be used to indicate that to be used for the parameter of resource of transferring ACK/NACK on the PHICH right

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

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

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

Summary of the invention

The purpose of the embodiment of the invention provides ACK/NACK transmission method and the base station in a kind of carrier aggregation system, to save resource.

For solving the problems of the technologies described above, the embodiment of the 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 uplink member carrier at described PUSCH place and the downlink member carrier at described PHICH place have following predefined corresponding relation:

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

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

Then:

The number of middle uplink member carrier is smaller 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 to receive the up data of sending by PUSCH;

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

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

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

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

The number of middle uplink member carrier is smaller 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 invention as seen, only predefined downlink member carrier remains for the PHICH resource that ACK/NACK replys in advance for the PUSCH of corresponding uplink member carrier, rather than all be that the PUSCH of all uplink member carrier remains for the PHICH resource that ACK/NACK replys in advance on each downlink member carrier, therefore can on the basis that certain PHICH flexible configuration based on UE is provided, save 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 the prior art;

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

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

Fig. 5 be in the prior art 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 the carrier aggregation system of the present invention;

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

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

Embodiment

The embodiment of the 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 the present invention program better, the embodiment of the invention is described in further detail below in conjunction with drawings and embodiments.

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

Need to prove that at first the example in the 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 invention goes for above-mentioned arbitrary situation.

Corresponding relation about 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 then 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 of the PHICH correspondence of each downlink member carrier can be made as

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

The number of middle uplink member carrier is smaller 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 the carrier aggregation system then 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 among the S620 can be the PUSCH pairing PHICH in predefined corresponding relation among the described S610, also can be the PUSCH pairing several PHICH in predefined corresponding relation among the described S610.

This PHICH, concrete, can dispose in conjunction with the setting of main carrier, also can be 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 uplink member carrier pairing downlink member carrier in PUSCH place described in the described corresponding relation, the downlink member carrier that disposes in conjunction with the setting of main carrier.The downlink member carrier at PHICH place also can comprise: in uplink member carrier pairing downlink member carrier in PUSCH place described in the described corresponding relation, dispatch the downlink member carrier at the PDCCH place of described PUSCH.

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

The up data of sending by PUSCH among the 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 among the 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 among the up PUSCH can take in all PRB, the up PUSCH transmission of terminal data need the data of transmission from the place transmission of this PRB numbering beginning.DMRS 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 is based on this basic DMRS sign indicating number and obtains after cyclic shift.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

) and DMRS information (be designated as n _DMRS) etc.

The PHICH of the ACK/NACK information of feeding back by downlink bearing among the S620, for the PUSCH transmission of dispatching in subframe n, UE determines at subframe n+k _PHICHIn the PHICH resource of correspondence, the k of FDD 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 the PHICH among the 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 according to the row of indicating in the PUSCH transmission permission in the DCI form 0 of PDCCH and 3bits indication determines jointly.

, concrete, as previously mentioned, mainly right among the S620 by parameter by the resource on the shared PHICH of the ACK/NACK of downstream feedback

Indication.

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

The index of representing the orthogonal sequence that adopts in the 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 the current subframe, can dispose 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 the expression DCI form 0;

n _DMRSBe the cyclic shift indication of the DMRS in the DCI form 0, its definition is as described above shown in the table 1.

In the present embodiment,

Can draw by following formula:

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

Can obtain by the downlink bandwidth information calculations in the broadcasting.

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

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

Wherein:

Expression be the number that is used for the PRB that up PUSCH transmits in i uplink member carrier in the set of the uplink member carrier of PHICH correspondence in j the downlink member carrier;

What represent is the PRB number of j downlink member carrier.

The set of the uplink member carrier of PHICH correspondence in the downlink member carrier can be as described in the preceding 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 compatibility of Ng, then can be so that the N after calculating by formula (2) _gWith the N among the LTE _gValue relatively, fall into which interval, just adopt which N _gBe configured.Like this, can on the basis that certain PHICH flexible configuration based on UE is provided, save resource overhead.

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

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, then obtain the resource that PHICH goes up transmission 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, wherein

What indicate is after the PRB numbering couples together, the PRB numbering of the minimum of representing on the PRB of this connection resource.

Like this, can on the basis that certain PHICH flexible configuration based on UE is provided, save 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, comprise 3 uplink member carrier and 3 downlink member carriers in the system.To PHICH in the 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.Then be specifically as follows:

The corresponding downlink member carrier 1 of uplink member carrier 1 and 2 set,

The corresponding downlink member carrier 2 of uplink member carrier 2 and 3 set,

The corresponding downlink member carrier 3 of uplink member carrier 1 and 3 set,

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

Restrictive condition above satisfying then for the PUSCH on the 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 by descending PHICH feeding back ACK/NACK, the uplink member carrier at the PUSCH place in this process and the downlink member carrier at PHICH place meet predefined corresponding relation afterwards.

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

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

Again for example, for uplink member carrier 3,, can adopt downlink member carrier 2 or downlink member carrier 3 according to predefined corresponding relation.Like this, if terminal sends data by the PUSCH on the uplink member carrier 3, after then these data are received in the base station, can come feeding back ACK/NACK by the PHICH on downlink member carrier 2 or the downlink member carrier 3.And downlink member carrier 1, because not in the uplink member carrier of predefined downlink member carrier 3 correspondences, therefore, needn't be preserved for the data of transmitting at uplink member carrier 3 on this downlink member carrier 1 and feed back resource needed, 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 the downlink member carrier 1, reserved the PHICH resource of uplink member carrier 2 and 3 in the downlink member carrier 2, reserved the PHICH resource of uplink member carrier 1 and 3 in the downlink member carrier 3.If UE can promptly reserve for 2 parts of PHICH resources on downlink member carrier 1 and the downlink member carrier 3 for this 1 PUSCH reserves 2 parts of PHICH resources at the most in the system at the most only with the transmission of the PUSCH on the uplink member carrier 1.Rather than all be this PUSCH reserved resource in all downlink member carriers, therefore,, can save resource with respect to prior art.

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

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

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

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

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

The PHICH that adopts, concrete, can dispose by high level, dispose as setting in conjunction with main carrier.Another kind of situation also can be 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 the system, then in order to alleviate the signaling burden on the 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 various objectives of system.Situation for the latter, for example, for adopting the PUSCH on the uplink member carrier 1 to transmit data, and this PUSCH is dispatched by the PDCCH on 1 on the downlink member carrier, then can still adopt the PHICH on this downlink member carrier 1 to feed back, promptly 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 the downlink member carrier, promptly the parameter of indexed resource is right

Still can adopt the mode in the aforementioned formula (1) to obtain.In the formula (1)

As previously mentioned, can draw by following formula:

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

Can obtain by the downlink bandwidth information calculations in the broadcasting.

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

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

Wherein:

Expression be the number that is used for the PRB that up PUSCH transmits in i uplink member carrier in the set of the uplink member carrier of PHICH correspondence in j the downlink member carrier;

What 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 of PHICH correspondence in each downlink member carrier, the numbering of the PRB of the uplink member carrier that set is interior couples together, afterwards, adopt described parameter that the PHICH of indication is gone up the ACK/NACK that resource is transmitted feedback, wherein parameter is a corresponding resource after the PRB numbering couples together to the resource of indication.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, then obtain the resource that PHICH goes up transmission 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,

Indication be the PRB numbering of minimum indicated after PRB numbering couples together.

The situation of the polymerization carrier wave that adopts for uplink transmission data no matter 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 to receive the up data of sending by PUSCH;

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

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

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

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

Then:

The number of middle uplink member carrier is smaller 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 uplink member carrier pairing downlink member carrier in PUSCH place described in the described corresponding relation, the downlink member carrier that disposes in conjunction with the setting of main carrier.

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

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

Preferably, the resource on the shared described PHICH of the ACK/NACK of described feedback is right by parameter

Indication, wherein

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

Numbering be from 0 to

The index of representing the orthogonal sequence that adopts in the 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 the current subframe, dispose 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 the expression DCI form 0;

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

Preferably,

By determining by following formula:

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

Obtain by the downlink bandwidth information calculations in the broadcasting.

Preferably,

By determining by following formula:

Wherein:

Obtain by the downlink bandwidth information calculations in the broadcasting;

N _gSet according to the uplink member carrier of PHICH correspondence in current each downlink member carrier is independently determined by following formula:

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

Wherein:

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

The PRB number of representing j downlink member carrier.

Preferably, it is characterized in that, described The 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 the carrier aggregation system, embodiment is similar with preceding method, does not repeat them here.

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 (15)

1. the ACK/NACK transmission method in the 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 uplink member carrier at described PUSCH place and the downlink member carrier at described PHICH place have following predefined corresponding relation:

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

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

Then:

The number of middle uplink member carrier is smaller 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.

2. the method for claim 1 is characterized in that, described predefined corresponding relation is notified to user terminal by high-level signaling or system broadcasts by the base station.

3. the method for claim 1 is characterized in that, the downlink member carrier at described PHICH place is determined in the following way:

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

4. the method for claim 1 is characterized in that, the downlink member carrier at described PHICH place comprises:

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

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

Indication, wherein

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

Numbering be from 0 to

The index of representing the orthogonal sequence that adopts in the 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 the current subframe, dispose 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 the expression DCI form 0;

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

6. method as claimed in claim 5 is characterized in that,

By determining by following formula:

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

Obtain by the downlink bandwidth information calculations in the broadcasting.

7. method as claimed in claim 5 is characterized in that,

By determining by following formula:

Wherein:

Obtain by the downlink bandwidth information calculations in the broadcasting;

N _gSet according to the uplink member carrier of PHICH correspondence in current each downlink member carrier is independently determined by following formula:

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

Wherein:

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

The PRB number of representing j downlink member carrier.

8. method as claimed in claim 5 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.

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

Receiving element is used to receive the up data of sending by PUSCH;

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

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

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

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

Then:

The number of middle uplink member carrier is smaller 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.

10. base station as claimed in claim 9 is characterized in that, the downlink member carrier at described PHICH place is:

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

11. base station as claimed in claim 9 is characterized in that, the downlink member carrier at described PHICH place comprises:

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

12. base station as claimed in claim 9 is characterized in that, the resource on the shared described PHICH of the ACK/NACK of described feedback is right by parameter

Indication, wherein

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

Numbering be from 0 to

The index of representing the orthogonal sequence that adopts in the 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 the current subframe, dispose 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 the expression DCI form 0;

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

13. method as claimed in claim 12 is characterized in that,

By determining by following formula:

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

Obtain by the downlink bandwidth information calculations in the broadcasting.

14. method as claimed in claim 12 is characterized in that,

By determining by following formula:

Wherein:

Obtain by the downlink bandwidth information calculations in the broadcasting;

N _gSet according to the uplink member carrier of PHICH correspondence in current each downlink member carrier is independently determined by following formula:

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

Wherein:

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

The PRB number of representing j downlink member carrier.

15. base station as claimed in claim 12 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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