CN102123016A - Method for determining acknowledgement (ACK)/negative acknowledgement (NACK) channel - Google Patents

Abstract

The invention discloses a method for determining a acknowledgement (ACK)/negative acknowledgement (NACK) channel in a wireless communication system of asymmetric carrier aggregation, the method comprises the following steps: A, determining the ACK/NACK channel mapped by an existing physical downlink control channel in accordance with a rule of evenly using an ACK/NACK channel on an uplink cell carrier (CC); and B, feeding back the ACK/NACK information by a terminal based on the determined ACK/NACK channel. By using the method, the average of the ACK/NACK channel mapped by a downlink CC can be realized easily without exerting extra limitations by a base station, thus greatly improving the scheduling flexibility.

Description

A kind of definite method of ACK/NACK channel

Technical field

The present invention relates to wireless communication technology, particularly a kind of affirmation/deny definite method of (ACK/NACK) channel.

Background technology

In strengthening Long Term Evolution (LTE-A) system, in order to support higher transmission rate, carrier combination (Carrier Aggregation) technology has been proposed, be specially: obtain bigger bandwidth of operation by making up a plurality of unit carrier wave (CC), so that constitute communication system down link and up link.For example, in order to support the bandwidth of 100MHz, can obtain by the CC that makes up 5 20MHz.

Wherein, transfer of data and LTE system class seemingly all are based on the automatic repeat requests of mixing (HARQ) and carry out transfer of data in the LTE-A system, be specially: the data receiver determines whether correctly to receive data, when being, and feeding back ACK information, not the time, the feedback nack message.Here, ACK/NACK information is the ACK/NACK channel of capable control channel (PUCCH) physically.Therefore, as can be seen, when feeding back ACK/nack message, need at first to determine the ACK/NACK channel that uses.Respectively definite method of the ACK/NACK channel of use that needs under symmetrical carrier wave and two kinds of situations of asymmetric carrier wave is described below.

Referring to Fig. 1, Fig. 1 is symmetrical carrier combination schematic diagram.Here, symmetrical carrier combination is exactly in fact that the number of up-downgoing CC equates that promptly up CC is related one by one with descending CC.In the prior art, provide the ACK/NACK channel definite method at symmetrical carrier combination, mainly comprise:, this descending CC is gone up send the system broadcast information that the up CC that has carried association goes up the identification information (being specially the index of ACK/NACK channel etc.) that distributes the ACK/NACK channel at each descending CC; Afterwards, according to this system broadcast information, on the up CC related, distribute the ACK/NACK channel with this descending CC.

Here, asymmetric carrier combination is exactly in fact that the number of up-downgoing CC is unequal, can be divided into two kinds of situations during specific implementation, wherein a kind of situation is professional asymmetry, be specially: the number of the descending CC of configuration is more than up CC in sub-district, that is, need to distribute the ACK/NACK channel of a plurality of descending CC in up CC; Another kind of situation is: no matter whether the number of the up-downgoing CC of configuration is equal in sub-district, can the specific asymmetric carrier combination of configure user, for example, terminal receives PDSCH simultaneously on a plurality of descending CC, and only on a up CC, send upward signal, so that terminal power saving.Based on above-mentioned two kinds of situations, below in the prior art during asymmetric carrier combination definite method of ACK/NACK channel be described.

Schematic diagram with asymmetric carrier combination shown in Figure 2 is an example, and as shown in Figure 2, because the number of up CC only is 1, and the number of descending CC based on this, just need be distributed the ACK/NACK channel of a plurality of descending CC correspondences greater than 1 in a up CC.In order to control the expense of ACK/NACK channel to greatest extent, terminal pins adopts same procedure to determine corresponding ACK/NACK channel to all descending CC.Existing LTE FDD determines the ACK/NACK channel method such as employing, $n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{CCE}}+N_{\mathrm{PUCCH}}^{\left(1\right)},$ Wherein, n _CCEThe index of the control channel unit (CCE) that comprises for descending CC, n _PUCCH ⁽¹⁾Be the index of the ACK/NACK channel of this CCE mapping, N _PUCCH ⁽¹⁾Be high-rise configuration parameter.Like this, " tree-like " structure that adopts when being combined into PDCCH with CCE among the LTE, promptly to comprising the PDCCH of m CCE, m=1,2,4,8, it can only be the CCE of the multiple of m from index, so, correspondingly, will to make index of reference be the ACK/NACK channel of the multiple of m to the UE that dispatches with the PDCCH that comprises m CCE.As can be seen, to each CC, each CC is actual, and to be more prone to make index of reference be the ACK/NACK channel of the multiple of m (m is greater than 1), that is to say that the ACK/NACK channel can not on average be used.For the ACK/NACK channel that makes each CC go up data dispatching does not collide, just need the base station to apply more restriction, this obviously is unfavorable for improving dispatching flexibility.

Summary of the invention

The invention provides definite method of the ACK/NACK channel in a kind of wireless communication system that is applied to asymmetric carrier combination, so that help improving dispatching flexibility.

Technical scheme provided by the invention realizes by following operation:

Definite method of the ACK/NACK channel in a kind of wireless communication system that is applied to asymmetric carrier combination may further comprise the steps:

A goes up the principle of ACK/NACK channel and determines the ACK/NACK channel that current PDCCH shines upon according to the up CC of even use;

B, the ACK/NACK channel feedback ACK/NACK information of terminal by determining.

As can be seen from the above technical solutions, in definite method of the ACK/NACK channel in the wireless communication system that is applied to asymmetric carrier combination provided by the invention, when determining the ACK/NACK channel of PDCCH mapping, go up the principle of ACK/NACK channel determines according to the up CC of even use, so, be easy to realize that the ACK/NACK channel of descending CC mapping is average, avoiding each CC in the prior art to be more prone to make index of reference is the technical problem that the ACK/NACK channel of the multiple of m (m is greater than 1) is brought, and this obviously helps improving dispatching flexibility.

Description of drawings

Fig. 1 is a symmetrical carrier combination schematic diagram in the prior art;

Fig. 2 is an asymmetric carrier combination schematic diagram in the prior art;

Fig. 3 is first schematic diagram of first embodiment of the invention;

Fig. 4 is second schematic diagram under the first embodiment of the invention;

Fig. 5 is the 3rd schematic diagram under the first embodiment of the invention;

Fig. 6 is the schematic diagram of second embodiment of the invention;

Fig. 7 is the schematic diagram of third embodiment of the invention.

Embodiment

Definite method of the ACK/NACK channel in the wireless communication system that is applied to asymmetric carrier combination that the embodiment of the invention provides, central idea is: the number of the ACK/NACK channel that has distributed in the number of the CCE that comprises according to current PDCCH and the up CC, the principle that goes up the probability of use of ACK/NACK channel according to the up CC of equalization is determined the ACK/NACK channel of current PDCCH mapping.Afterwards, terminal can be passed through definite ACK/NACK channel feedback ACK/NACK information, and the ACK/NACK information that the base station also can be fed back by the ACK/NACK channel receiving terminal of determining.

In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.Need to prove that for ease of describing, following each embodiment is based on a plurality of descending CC and sends PDCCH, the situation that only sends ACK/NACK in a up CC is that example is described.

First embodiment:

As shown in Figure 3, this embodiment is in order to reduce the expense of PDCCH, in PDCCH, do not increase the identification information of the ACK/NACK channel be used to distinguish this PDCCH mapping, but the number of ACK/NACK channel is determined the ACK/NACK channel that PDCCH shines upon in the index of the index of the CCE that comprises according to current PDCCH fully, the descending CC in PDCCH place and the up CC.Wherein, why to use the index of the descending CC in PDCCH place mainly be in order to guarantee that PDCCH among the different descending CC will be mapped to up CC and go up on the different ACK/NACK channels to present embodiment.

In the present embodiment, supposing does not need to make the CCE on the residing descending CC of current PDCCH to be mapped to continuous ACK/NACK channel in the up CC, determines in the present embodiment that then the ACK/NACK channel of current PDCCH mapping specifically comprises:

At first, on the ACK/NACK channel that the CCE on the descending CC is disperseed to have distributed in the up CC of mapping, obtain interim ACK/NACK channel indexes n _PUCCHGoing up index with descending CC is n _CCECCE be example, then n _PUCCHCan realize by following formula 1:

Perhaps

(formula 1)

Wherein,

Round N under the expression _{CCE, k}Be the sum of the CCE that comprises in the residing descending CC of this current PDCCH when equaling k of the value of the PCFICH of current PDCCH correspondence, if ignore the expense of PCFICH and PHICH, then N _{CCE, k}Can be:

N _RB ^DLBe Physical Resource Block (PRB) sum in the system bandwidth, N _Sc ^RBIt is the number of subcarrier in the PRB; N _ANBe the number information of the last ACK/NACK channel that distributes of up CC, this N _ANCan send to terminal by high-level signaling such as broadcast signaling or RRC signaling, perhaps this N _ANDo not send, but determine, such as regulation N by additive method is implicit by special signaling _ANEqual the maximum number of the CCE on the descending CC of preassigned master of up CC correspondence, the CCE number when promptly sending physical control channels with 3 OFDM symbols, certainly, if ignore the influence of PCFICH and PHICH, N _ANCan estimate by formula 2:

(formula 2)

Next, to each CCE on the current PDCCH place CC,, finally determine the index n of the ACK/NACK channel of this CCE mapping according to the index of the interim ACK/NACK channel of this CCE mapping and the deviant of current PDCCH place CC correspondence _PUCCH ⁽¹⁾, this can determine by formula 3:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{PUCCH}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{PUCCH}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ (formula 3)

Wherein, N _PUCCH ⁽¹⁾Be the parameter of high level configuration, f (i _CC) be the deviant of the descending CC correspondence in current PDCCH place, i _CCIndex for descending CC.

Need to prove, in the present embodiment, the deviant of descending CC correspondence has been provided when carrying out this step, during specific implementation multiple mode can be arranged, such as: a kind of mode is for all descending CC are provided with different deviants respectively, can represent by following formula 3-1:

F (i _CC)=ci _CC(formula 3-1)

Another kind of mode is for the identical deviant of more than one descending CC configuration, that is to say, the number of the deviant of setting greater than 1 but less than the sum of descending CC, can represent by following formula 3-2:

F (i _CC)=cmod (i _CC, P), (formula 3-2)

Here, P is the number of the deviant of setting.

Among above formula 3-1 or the formula 3-2, parameter c is predefined numerical value, also can be the numerical value of semi-static configuration, and for example, c equals 1; Perhaps, consider that UE may take two adjacent ACK/NACK channels of index and come feeding back ACK/nack message, also can make c equal 2 or be 2 multiple.So, when carrying out this step, the deviant of searching the descending CC correspondence in current PDCCH place from the deviant of the descending CC correspondence that set in advance gets final product.

Need to prove, above-mentioned is to be example not make CCE on the residing CC of current PDCCH be mapped to ACK/NACK channel continuous in the up CC, preferably, a kind of expansion as the embodiment of the invention, suppose to make the CCE on the residing CC of current PDCCH to be mapped to continuous ACK/NACK channel in the up CC, its concrete operations are similar to the above, promptly determine CCE index n earlier _CCEThe interim ACK/NACK channel indexes n of mapping _PUCCH, here, because present embodiment makes the CCE on the residing CC of current PDCCH be mapped to continuous ACK/NACK channel in the up CC, therefore, n _PUCCH=n _CCEAfterwards, in conjunction with the deviant f (i of the descending CC correspondence in current PDCCH place _CC), the ACK/NACK channel indexes n that is finally shone upon _PUCCH ⁽¹⁾, specifically by shown in the formula 3-3:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)},$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ (formula 3-3)

Need to prove that because the PCFICH of each descending CC dynamically arranges, promptly the CCE number of each descending CC is dynamic change, in order to make full use of all ACK/NACK channels of up CC, then deviant f (i _CC) in the time of also need all getting smaller value (for example PCFICH equals 1) at the PCFICH of each descending CC, guarantee that as far as possible the CCE on each descending CC is mapped on the different ACK/NACK channels, promptly can fully be mapped on all ACK/NACK channels of up CC, based on this, can be provided with among formula 3-1 or the formula 3-2 and calculate f (i _CC) time parameter c equal or the numerical value of CCE when approximating an OFDM symbol transmission physical control channel, remember that this numerical value is ${\mathrm{<figure-callout\; id="0"\; label="c"\; filenames="H2010100023880E00012.png"\; state="\{\{state\}\}">c</figure-callout>}}_0=N_{\mathrm{CCE}}^{\left(1\right)},$ Certainly, if ignore the influence of PCFICH and PHICH, N _CCE ⁽¹⁾Can be estimated as

As the another way that parameter c is set in the embodiment of the invention, can also be the number information N of the ACK/NACK channel that comprises on the up CC _ANBe divided into N _CCPart, wherein, N _CCBe the number of the descending CC of base station configuration, the numerical value that this parameter c is at or about a ACK/NACK channel (is designated as c ₀'), remember that this numerical value is

Those skilled in the art will know that, CCE is to adopt the tree structure combination when combination PDCCH among the LTE, promptly to comprising the PDCCH of m CCE, it can only be the CCE of the multiple of m from index, and the ACK/NACK channel that UE only uses the CCE of the index minimum of PDCCH to shine upon, this causes index is that the ACK/NACK of CCE correspondence of the multiple of m (m greater than 1, for example 2,4 and 8) is used with bigger probability.Based on this, can adjust N in the present embodiment _ANWith the value of c, thereby thereby the load of the ACK/NACK channel of the up CC of balance reduces when dispatching restriction, for example, can dispose N _ANFor the even number parameter c is an odd number, like this, can guarantee index i _CCTending to make index of reference for the CC of even number is the ACK/NACK channel of even number, and index i _CCFor the CC of odd number tends to make index of reference is the ACK/NACK letter of odd number.Based on this, according to top description, parameter c finally can be defined as near above-mentioned c in the present embodiment ₀Or c ₀' an odd number, for example

Perhaps

So far, realized that by aforesaid operations the embodiment of the invention provides the method for fixing CCE mapping ACK/NACK channel that capable CC comprises really.

Consider the application of the embodiment of the invention, the present inventor also provides several concrete extended mode of present embodiment, is that example is described in following three kinds of modes below, need to prove, these three kinds of modes are a kind of giving an example, and the application of the non-limiting embodiment of the invention.

First kind of mode:

As shown in Figure 4, the manner is in order to realize that further identical CCE index is mapped to different ACK/NACK channels among the different descending CC, on the basis of the foregoing description, also further according to the sign of terminal UE such as the ACK/NACK channel that UE ID determines the PDCCH mapping, specifically comprise: the index (for example CCE of index minimum) of an appointed CCE who comprises according to current PDCCH, receive the UE ID of the terminal of this PDCCH, the number of the ACK/NACK channel that has distributed in the index of the current PDCCH descending CC in place and the up CC is determined the index n of the ACK/NACK channel of this appointed CCE mapping _PUCCH ⁽¹⁾

Here, the UE ID with the terminal that receives PDCCH is n _RNTI, the index of the current PDCCH descending CC in place is i _CC, an appointed CCE index be n _CCEBe example, the index n of then above-mentioned definite ACK/NACK channel _PUCCH ⁽¹⁾Realize by formula 4:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(Y_k+n_{\mathrm{CCE}})\mathrm{mod}{N}_{\mathrm{AN}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(Y_k+n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)};$ (formula 4)

Wherein, f (i _CC) be the deviant of each descending CC correspondence specifically calculate as above formula 3-1 or 3-2 described, repeat no more here; Y _kBy UE ID decision, if adopt identical mapping method, then Y in each subframe _k=n _RNTIPreferably, in the manner,, can also make designated CCE in different subframes, be mapped to different ACK/NACK channels for the mapping of the above-mentioned designated CCE of randomization in different subframes to the ACK/NACK channel, so, Y _kBy UE ID and subframe numbers decision, for example adopt the method for determining UE particular search space among the existing LTE, Y _k=(AY _K-1) modD, wherein, Y _-1=n _RNTI≠ 0, A=39827, D=65537and

n _sIt is the timeslot number in a frame.

So far, finish the description of first kind of mode.

The second way:

This mode is different from first kind of mode, specifically may further comprise the steps:

Step 200 is determined the particular search space of described terminal in the descending CC in described PDCCH place.

Here, this step 200 can be carried out according to the mode in definite particular search space in the existing LTE system, and the embodiment of the invention repeats no more.

Step 201, the CCE that described particular search space is comprised begins to set gradually index from preset value.

Here, preset value can be 0, perhaps other values, and such as 1 etc., present embodiment does not limit.

Step 202 is determined the index n of the ACK/NACK channel of this CCE mapping according to the UE ID of the index of the CC at the index of each CCE, described PDCCH place and described terminal _PUCCH ⁽¹⁾

The value that is provided with step 201 is n _CCEIndex be example, then this step 202 realizes by following formula 5:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(Y_k+n_{\mathrm{CCE}})\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)};$ (formula 5)

Certainly, in order to realize that further identical CCE index is mapped to different ACK/NACK channels among the different descending CC, above-mentioned formula 5 is also replaceable to be formula 5-1:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(Y_k+n_{\mathrm{CCE}})\mathrm{mod}{N}_{\mathrm{AN}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(Y_k+n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ (formula 5-1)

Need to prove, as another kind of embodiment of the present invention, step 202 is also replaceable be step 202 ': according to the method for existing LTE, with N _ANCalculate the starting position in particular search space for the number of CCE:

Wherein, L is the CCE number that current PDCCH comprises; Afterwards, with

Be original position, the CCE that comprises from this starting position begins to determine successively the index n of the ACK/NACK channel of each CCE mapping the described particular search space _PUCCH ⁽¹⁾Specifically represent by formula 5-2:

Perhaps

(formula 5-2)

Preferably, step 202 ' also can be further according to the index i of the current PDCCH descending CC in place _CCDeviant f (the i that each descending CC is provided with mapping is set respectively _CC), so, formula 5-2 is the corresponding formula 5-3 that replaces with further:

Perhaps

(formula 5-3)

So far, finish the description of the second way.

The third mode:

The manner is different from the above-mentioned first kind of mode and the second way, and the manner is also considered the PRB of the index of the appointed PRB that the PDSCH of current PDCCH correspondence comprises such as the index minimum, specifically as shown in Figure 5.In Fig. 5, the ACK/NACK channel determined in appointed PRB index (for example PRB of index minimum) that the index (for example CCE of index minimum) of the appointed CCE that present embodiment comprises at current PDCCH, corresponding PDSCH comprise and the index of the current PDCCH descending CC in place.The appointed PRB index that comprises with PDSCH is n _PRB, the index of the current PDCCH descending CC in place is i _CC, the index of the appointed CCE that current PDCCH comprises is n _CCE, then pass through the index n that following formula 6 is determined the ACK/NACK channels of mapping _PUCCH ⁽¹⁾:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{PRB}}+n_{\mathrm{CCE}})\mathrm{mod}{N}_{\mathrm{AN}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{PRB}}+n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ (formula 6)

So, base station dispatcher is by adjusting the CCE index that appointed PRB index and current PDCCH take, and can realize that a PDCCH on the descending CC evenly is mapped on all ACK/NACK channels on the up CC; And, adopt side-play amount f (i _CC), can further guarantee to make the PDCCH among the different descending CC to be mapped on the upward different ACK/NACK channel of up CC.

So far, finish description to the third mode.

Be the description of first embodiment of the invention more than, below second embodiment of the invention be described.

Second embodiment:

Present embodiment is different from first embodiment, present embodiment is in order further to improve flexibility, can be further during according to the CCE mapping ACK that is used to indicate current PDCCH to comprise/NACK channel the information b of employed deviant determine the ACK/NACK channel of current PDCCH mapping, wherein, this information b can be carried by PDCCH, be specially the information b that in PDCCH, increases the ACK/NACK channel of distinguishing mapping, perhaps adopting other modes to inform needs the terminal of the ACK/NACK channel of definite current PDCCH mapping, does not specifically limit here.

For ease of describing, present embodiment is carried by PDCCH with information b and is example, based on this, when present embodiment is determined the ACK/NACK channel of CCE mapping, the index of the CCE that can comprise according to PDCCH and the information b that carries, and determine the index n of the ACK/NACK channel that PDCCH shines upon in conjunction with the formula that existing LTE FDD calculates the ACK/NACK channel indexes _PUCCH ⁽¹⁾, be specially following formula 7:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{CCE}}+o\left(b\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ (formula 7)

Here, o (b) is the deviant of information b indication among the PDCCH, and is specifically relevant with the bit that information b takies, and is 2 bit informations such as information b, and then o (b) can get 4 values, for example 0,1,2 and 3.But, adopt the method for this definition o (b), the OFDM symbol that is used for transmitting control channel on each CC more after a little while, the CCE number is less, PDCCH on this CC can only be mapped to the less ACK/NACK channel of index value in the up CC, thereby causes the load inequality of the ACK/NACK channel of distribution in the up CC.

In order to solve the uneven problem of above-mentioned load, information b, the index i of the residing descending CC of current PDCCH of the ACK/NACK channel of the differentiation mapping that the present invention gives chapter and verse the CCE index, increase in current PDCCH _CCNumber N with the ACK/NACK channel that has distributed in the up CC _ANCalculate the ACK/NACK channel indexes of a PDCCH mapping.Four kinds of preferred modes are described below.Need to prove that these four kinds of modes are that some are given an example, and the application of the non-limiting embodiment of the invention.

Mode 1:

The manner 1 is according to the index i of the current PDCCH descending CC in place _CCObtain the deviant f (i of this descending CC correspondence _CC), wherein, this deviant f (i _CC) concrete set-up mode and embodiment one similar, repeat no more here, preferably, deviant f (i in the present embodiment _CC) in the time of need all getting smaller value (for example PCFICH equals 1) at the PCFICH of each descending CC, guarantee that as far as possible the CCE on the different descending CC is mapped on the different ACK/NACK channels, promptly can fully be mapped on all ACK/NACK channels of up CC.Afterwards, utilize this deviant that obtains to determine the ACK/NACK channel indexes n of current PDCCH mapping _PUCCH ⁽¹⁾, specifically embody by following formula:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+o\left(b\right))\mathrm{mod}{N}_{\mathrm{AN}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+o\left(b\right)+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}.$ (formula 8)

Here, deviant can o (b) and N _ANIrrelevant, for example information b is 2 bits, and then deviant o (b) can be 0,1,2,3 or 1,3,5,7 etc.

So far, finish the description of aforesaid way 1.

Mode 2:

Here, mode 2 is the number N according to the ACK/NACK channel that distributes in the up CC _ANDispose deviant o (b), specifically, make each value of o (b) be distributed to 0 to N exactly _ANOn, so, correspondingly, determine ACK/NACK channel indexes n in the manner _PUCCH ⁽¹⁾Formula can replace with formula 9:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+o\left(b\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}.$ (formula 9)

For each value that makes o (b) is distributed to 0 to N _ANOn, the manner 2 definable o (b) are o (b)=bN _{CCE, 1}Perhaps

Wherein, N _{CCE, 1}Be the numerical value of CCE when first OFDM symbol sends physical control channel only, here, if ignore the influence of PCFICH and PHICH, this numerical value can be estimated as

Wherein, N _bBe the number that information b is allowed to value, be specially b=0,1 ... N _b, for example information b is 2 bit informations, then N _bEqual 4.

Need to prove, owing to when determining the ACK/NACK channel indexes of each CCE mapping, all need to use o (b), and according to top description, the N that is adopted when determining o (b) _bBe the number that information b is allowed to value, be specially 0,1 ..., N _b-1, like this, the ACK/NACK channel distribution of each CCE mapping is gone up on all ACK/NACK channels to up CC.So, the actual ACK/NACK channel that takies of current PDCCH can be controlled by adjustment information b in the base station, and then reaches the load equalization of ACK/NACK channel on up CC, thereby reduces the restriction and the interference of scheduling.

Preferably, the CCE of same index is mapped to identical ACK/NACK channel and causes the extra scheduling restriction that increases in the descending CC of difference, can be further according to the index i of current PDCCH place CC _CCObtain the deviant f (i of different descending CC at mapping ACK/NACK channel _CC), specifically as shown in Figure 6, so, formula 9 is replaceable to be following formula 9:

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+o\left(b\right))\mathrm{mod}{N}_{\mathrm{AN}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps

$n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+o\left(b\right)+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}.$ (formula 9)

So far, finish the description of aforesaid way 2.

Mode 3:

The manner 3 specifically realizes by following step:

Step 300 is according to the total N of the current CCE that comprises of the descending CC in current PDCCH place _{CCE, k}Number N with the ACK/NACK channel that distributes in the up CC _ANCalculate the start position information of the ACK/NACK channel of CCE mapping in this descending CC.

Here, calculate on the ACK/NACK that ACK/NACK channel dispersion that principle is specially the CCE mapping that makes PDCCH place CC distributes in the up CC.For example, index is n in this step 300 _CCEThe original position of ACK/NACK of CCE mapping represent by following formula:

Step 301, the deviant o (b) of this CCE of the information b indication of carrying according to the start position information that calculates and described PDCCH calculates the index n of the ACK/NACK channel of described CCE mapping _PUCCH ⁽¹⁾

Here, in this step 301, deviant can o (b) and N _ANIrrelevant, for example information b is 2 bits, and then deviant o (b) is 0,1,2,3 or 1,3,5,7 etc., so, the index n of the ACK/NACK channel that this step 301 is determined _PUCCH ⁽¹⁾For:

Perhaps

(formula 10)

Preferably, the CCE of same index is mapped to identical ACK/NACK channel and causes the extra scheduling restriction that increases in the descending CC of difference, can be further according to the index i of current PDCCH place CC _CCObtain the deviant f (i of different descending CC at mapping ACK/NACK channel _CC).So, formula 10 is replaceable be following formula 10 ':

Perhaps

(formula 10)

So far, finish the description of aforesaid way 3.

Mode 4:

The second way of the manner and first embodiment is similar, specifically may further comprise the steps:

Step 400 is determined the particular search space of described terminal in the CC at current PDCCH place.

Step 401, the CCE that described particular search space is comprised begins to set gradually index from preset value.

Step 402 is according to the method for existing LTE, with N _ANCalculate the starting position in particular search space for the number of CCE.

Here, step 402 can be calculated by following formula:

Wherein, L is the CCE number that PDCCH comprises.

Step 403 is at the starting position of calculating from step 402, according to the index n of this CCE _CCEDetermine the index n of the ACK/NACK channel of this CCE mapping with deviant o (b) _PUCCH ⁽¹⁾

Here, step 403 realizes by formula 11:

Perhaps

(formula 11)

Preferably, the CCE of same index is mapped to identical ACK/NACK channel and causes the extra scheduling restriction that increases in the descending CC of difference, can be further according to the index i of current PDCCH place CC _CCChange the index of the ACK/NACK channel of mapping, so, formula 11 is replaceable be following formula 11 ':

Perhaps

(formula 11)

So far, finish description to mode 4.

Be the description of second embodiment of the invention more than, below third embodiment of the invention be described.

The 3rd embodiment:

Present embodiment is with respect to the first above-mentioned embodiment and second embodiment, fairly simple, be specially: when the ACK/NACK channel of the PDCCH of a plurality of descending CC correspondence sends on same CC, as shown in Figure 7, then on up CC, distribute two groups of ACK/NACK channels, wherein the CCE of first group of ACK/NACK channel and appointed descending CC as main descending CC has the relation of mapping one by one, so, can realize that LTE UE in the main descending CC and the HARQ of more senior UE transmit, need to prove, can adopt the method for the CCE mapping ACK/NACK channel that defines among the LTE to satisfy backward compatibility here; And second group of ACK/NACK channel with remove that the CCE of other descending CC shines upon the main descending CC, based on this, the ACK/NACK channel of determining mapping in the present embodiment specifically comprises: whether the CC that determines current PDCCH place earlier is the descending CC of the descending CC of conduct master of appointment, if determine the ACK/NACK channel that described PDCCH shines upon according to the principle that the wherein one group of ACK/NACK channel in two groups of ACK/NACK channels that distributed in main descending CC and the described up CC shines upon one by one; If not, determine the ACK/NACK channel of PDCCH mapping according to the predefined mapping method that adopts with descending CC except that main descending CC.Here, main descending CC supports the UE of LTE, and other the descending CC except that main descending CC can not support the UE of LTE, based on this, the CCE of other descending CC except that main descending CC can redefine to the mapping of ACK/NACK, specifically, under the prerequisite that the ACK/NACK channel that the PDCCH that guarantees to dispatch on each descending CC shines upon in up CC does not collide, other descending CC except that main descending CC can be mapped to second group of ACK/NACK channel with identical method, for example all adopt the method for existing LTE that the method that perhaps adopts above-mentioned first embodiment or second embodiment to provide is provided.

As can be seen from the above technical solutions, the present invention is when determining the ACK/NACK channel of PDCCH mapping, go up the principle of ACK/NACK channel determines according to the up CC of even use, so, be easy to realize that the ACK/NACK channel of descending CC mapping is average, avoiding each CC in the prior art to be more prone to make index of reference is the technical problem that the ACK/NACK channel of the multiple of m (m is greater than 1) is brought, and this obviously helps improving dispatching flexibility.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (15)

1. definite method of the ACK/NACK channel in the wireless communication system that is applied to asymmetric carrier combination is characterized in that this method may further comprise the steps:

A goes up the principle of ACK/NACK channel and determines the ACK/NACK channel that current PDCCH shines upon according to even use upstream cell carrier wave CC;

B, the ACK/NACK channel feedback ACK/NACK information of terminal by determining.

2. method according to claim 1 is characterized in that, determining in the described steps A comprises:

A1 determines the deviant of the descending CC correspondence in current PDCCH place;

A2 determines the ACK/NACK channel of described PDCCH mapping according to the index of the deviant of the descending CC correspondence of determining in the number of the ACK/NACK channel that has distributed in the up CC, the steps A 1 in current PDCCH place, control channel unit CCE that described PDCCH comprises.

3. method according to claim 2 is characterized in that, described steps A 2 comprises:

Steps A 21 is calculated the index n of the ACK/NACK channel that has distributed in the up CC of the interim mapping of each CCE that described PDCCH comprises _PUCCH

Steps A 22, each CCE that comprises at described PDCCH is according to the index n of the ACK/NACK channel of the interim mapping of this CCE _PUCCH, the ACK/NACK channel that distributed in the up CC number N _ANWith the deviant of the descending CC correspondence in described PDCCH place, determine the index n of the ACK/NACK channel of the final mapping of this CCE _PUCCH ⁽¹⁾

4. method according to claim 3 is characterized in that, described steps A 21 is calculated according to the principle that each CCE that described PDCCH is comprised disperses to be mapped to the ACK/NACK channel, specifically realizes by following formula:

Perhaps

Wherein,

Round n under the expression _CCEThe index of the CCE that comprises for described PDCCH, N _{CCE, k}When being k for described PDCCH corresponding physical format indication channel PCFICH value, the sum of CCE in the described PDCCH descending CC of living in;

Described steps A 22 is by following formula

$n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{PUCCH}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps $n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{PUCCH}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Realize; Wherein, f (i _CC) be the deviant of the descending CC correspondence in described PDCCH place, i _CCBe the index of described PDCCH place CC, N _PUCCH ⁽¹⁾Be high-rise configuration parameter.

5. method according to claim 3 is characterized in that, is mapped to the principle calculating of continuous ACK/NACK channel in the described steps A 21 according to each CCE that described PDCCH is comprised;

Pass through to adjust described definite deviant and N in the described steps A 22 _AN, and utilize following formula

$n_{\mathrm{PUCCH}}^{\left(1\right)}=n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right)+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Perhaps $n_{\mathrm{PUCCH}}^{\left(1\right)}=(n_{\mathrm{CCE}}+f\left(i_{\mathrm{CC}}\right))\mathrm{mod}{N}_{\mathrm{AN}}+N_{\mathrm{PUCCH}}^{\left(1\right)}$ Realize.

6. according to claim 4 or 5 described methods, it is characterized in that in the described steps A 1, the deviant of predetermined descending CC correspondence is to be provided with according to the principle that makes the corresponding different deviants of all descending CC difference, specifically realizes by following formula: deviant f (i _CC)=ci _CCPerhaps,

According to a principle with the corresponding same offset value of up-downgoing CC is provided with, realize by following formula:

f(i _CC)＝c·mod(i _CC，P)

Wherein, i _CCBe the index of a descending CC, P is the number of the deviant of setting, and c is the numerical value that sets in advance, and perhaps is the numerical value of semi-static configuration.

7. method according to claim 6 is characterized in that, described c is an odd number,

By the decision of the CCE number during the transmitting physical control channel in the OFDM symbol; Perhaps

The number N of the ACK/NACK channel that in up CC, has distributed _ANBe divided into N _CCDuring part, wherein, N _CCBe the number of the descending CC of base station configuration, by the number decision of any a ACK/NACK channel.

8. method according to claim 1 is characterized in that, determining in the described steps A comprises:

The number of the ACK/NACK channel that has distributed in the index of the appointed CCE that comprises according to described PDCCH, the index of the descending CC in PDCCH place, the up CC and the sign UE ID of described terminal determine the ACK/NACK channel of described appointed CCE mapping; Perhaps,

Determine the particular search space of described terminal in the descending CC in described PDCCH place, the CCE that described particular search space is comprised begins to set gradually index from preset value;

Afterwards, each CCE at described particular search space comprises determines the ACK/NACK channel that this CCE shines upon according to the index of the index of this CCE, the described PDCCH descending CC in place and the sign UE ID of described terminal; Perhaps, calculate the starting position in described particular search space, the CCE that comprises from described starting position begins to determine successively the ACK/NACK channel of each CCE mapping the described particular search space.

9. method according to claim 1 is characterized in that, determining in the described steps A comprises:

A0, the index of the appointed CCE that comprises according to described PDCCH, with described PDCCH corresponding physical descending shared control signal channel PDSCH in the index of the index of appointed PRB and the descending CC in PDCCH place determine the ACK/NACK channel of described PDCCH mapping.

10. method according to claim 1 is characterized in that, determining in the described steps A comprises:

A3, the number of the ACK/NACK channel that has distributed in the index of the information b of employed deviant during according to the CCE mapping ACK that is used to indicate described PDCCH to comprise/NACK channel, CCE that described PDCCH comprises, the index of the described PDCCH descending CC in place, the up CC is determined the ACK/NACK channel of described PDCCH mapping.

11. method according to claim 10 is characterized in that, the information b of employed deviant is carried by PDCCH when being used to the CCE mapping ACK of indicating described PDCCH to comprise/NACK channel.

12. according to claim 10 or 11 described methods, it is characterized in that, described when being used to the CCE mapping ACK of indicating PDCCH to comprise/NACK channel employed deviant be according to being distributed in 0 to N _ANOn principle determine, specifically pass through

Perhaps N _CCE ⁽¹⁾B determines;

Wherein, Round N under the expression _ANBe the number of the ACK/NACK channel that distributed in the up CC, N _bThe value number that the information b that carries for described PDCCH is allowed to, N _CCE ⁽¹⁾The number of CCE when being first OFDM symbol transmission physical control channel.

13., it is characterized in that described steps A 3 comprises according to claim 10 or 11 described methods:

The number of the ACK/NACK channel that distributes in the sum of the CCE that comprises according to the descending CC in described PDCCH place and the up CC is calculated the start position information of the ACK/NACK channel of CCE mapping in this descending CC;

Each CCE that comprises at described descending CC, calculate the sign of the ACK/NACK channel of this CCE mapping according to the deviant of this CCE of described start position information and described information b indication, the ACK/NACK channel that is designated the sign of described calculating is defined as the ACK/NACK channel of described CCE mapping.

14., it is characterized in that described steps A 3 comprises according to claim 10 or 11 described methods:

Determine the particular search space of described terminal in the CC at described PDCCH place, the CCE that described particular search space is comprised begins to set gradually index from preset value; Calculate the starting position in described particular search space, each CCE that rise described starting position in the CC at described PDCCH place, calculate the sign of the ACK/NACK channel of described CCE mapping according to the deviant of this CCE of the index of this CCE and described information b indication, the ACK/NACK channel that is designated the sign of described calculating is defined as the ACK/NACK channel of described CCE mapping.

15. method according to claim 1 is characterized in that, determines to comprise in the described steps A:

Whether the CC that determines described PDCCH place is the descending CC of the descending CC of conduct master of appointment, if determine the ACK/NACK channel that described PDCCH shines upon according to the principle that the wherein one group of ACK/NACK channel in two groups of ACK/NACK channels that distributed in main descending CC and the described up CC shines upon one by one; If not, the mapping method that adopts according to descending CC predefined and except that main descending CC is determined the ACK/NACK channel of PDCCH mapping.

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