CN107294660B

CN107294660B - ACK/NACK feedback sequence determination method and device

Info

Publication number: CN107294660B
Application number: CN201610214203.XA
Authority: CN
Inventors: 高雪娟
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-03-31
Filing date: 2016-04-07
Publication date: 2020-04-10
Anticipated expiration: 2036-04-07
Also published as: CN107294660A

Abstract

The invention discloses a method and a device for determining an ACK/NACK feedback sequence, wherein the method comprises the following steps: determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the received DAI; and when determining that the SPS service is configured and/or an SPS subframe exists in a subframe set which needs ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number. Because the feedback information with the additionally set bit number is always supposed to exist in the dynamic ACK/NACK codebook determined according to the DAI, the inconsistency between the terminal packet loss and the understanding of the base station on the ACK/NACK codebook is avoided.

Description

ACK/NACK feedback sequence determination method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining an ACK/NACK feedback sequence.

Background

In a Long Term Evolution-Advanced (LTE-a) Release (Rel, Release) -10 Carrier Aggregation (CA) system, up to 5 Carrier Aggregation is supported. Pucchfmat 3 is defined to carry up to 22 bits of information transfer. In the LTE-A Rel-13CA system, up to 32 carrier aggregation is supported. As the number of aggregated carriers increases, the number of terminals feeding back ACK/NACK (ACKnowledgement/Non-ACKnowledgement) feedback information will also increase significantly. The Physical Uplink Control Channel (PUCCH) format (format) defined in the earlier release for transmitting ACK/NACK cannot already support transmission of so many ACK/NACK feedback bits, and therefore

new PUCCH formats

4 and 5 with larger capacity need to be defined, whose data and pilot structures are shown in fig. 1, where Di represents one symbol sequence. Since PUCCH format 4 does not use orthogonal sequences, only 1 terminal can be transmitted in 1 PRB, and since PUCCH format 5 uses orthogonal spreading sequences of length 2 in the frequency domain to further increase the multiplexing capacity, its carrying capacity is half that of PUCCH format 4. Both PUCCH formats 4 and 5 use a Quadrature Phase-Shift Keying (QPSK) modulation scheme. The PUCCH format 4 may use more than 1 Physical Resource Block (PRB) for transmission, and assuming that only 1 PRB and a normal Cyclic Prefix (CP) are occupied, the PUCCH format 4 may carry 288 bits of encoded information, that is, 144 modulation symbols, and the PUCCH format 5 may carry 144 bits of encoded information, that is, 72 modulation symbols.

For Frequency Division Duplex (FDD), the ACK/NACK feedback information of downlink transmission in subframe n is fed back in subframe n +4, and then the feedback window may be defined as a downlink carrier set aggregated by the terminal. For Time Division Duplex (TDD, Time Division Duplex), because the number of uplink and downlink subframes corresponding to different TDD uplink and downlink configurations is different, an ACK/NACK feedback timing sequence is defined for different TDD uplink and downlink configurations, as shown in table 1, ACK/NACK feedback information of different downlink subframes on the same carrier may need to be transmitted in the same uplink subframe, and according to a set K corresponding to an uplink subframe with the number n: { k } is a function of₀,k₁,…k_M-1Determining a downlink subframe (namely a downlink subframe numbered n-K and including a special subframe) needing ACK/NACK feedback in the uplink subframe n, wherein the value of each element K is the number of elements in a set K, and the values of different uplink subframes and different TDD uplink and downlink configuration M are not necessarily the same; when the terminal aggregates a plurality of TDD carriers, the downlink subframe determined according to the feedback timing sequence on the plurality of carriers also needs to be fed back in the uplink subframe N at the same time, so the feedback window of the TDD is M subframes in the time domain and N configuration carriers in the frequency domain.

Table 1: downlink subframe index set K of ACK/NACK feedback in same uplink subframe in TDD₀,k₁,…k_M-1}(Downlink association set index K:{k₀,k₁,…k_M-1}for TDD)

The numbers in table 1 are subframes with numbers n-k in units of radio frames, and if n-k is less than 0, it indicates that the subframe is a subframe in the previous radio frame.

In order to ensure that the terminal and the base station understand the ACK/NACK feedback sequence (ACK/NACK codebook) consistently, the ACK/NACK codebook is defined in Rel-12 and the foregoing versions according to the size of the feedback window, that is, for FDD, ACK/NACK feedback information needs to be generated for all configured carriers, for TDD, ACK/NACK feedback information needs to be generated for M subframes and N configured carriers, where NACK placeholders are generated for subframes/carriers that do not receive data. When the terminal aggregates more than 5 carriers, particularly when the number of aggregated carriers is large, the ACK/NACK codebook determined by the method is large, and more useless information is contained, so that the transmission efficiency of the ACK/NACK feedback information is reduced.

Considering that a terminal does not always schedule data transmission in all carriers and M subframes even if 32 carriers are aggregated, in order to improve the transmission efficiency of ACK/NACK feedback information, a dynamic ACK/NACK codebook transmission mode is defined, and ACK/NACK codebook corresponding to a feedback window is determined according to a Downlink allocation Index (Counter DAI, C-DAI; Downlink allocation Index, DAI) for cumulative counting in a Physical Downlink Control Channel (PDCCH)/enhanced Physical Downlink control channel (EPDCCH, enhanced PDCCH) received in the feedback window and DAI (Total DAI, T-DAI) for indicating Total scheduling data amount; the ACK/NACK feedback information is sorted by the C-DAI, and the bit number of the ACK/NACK feedback information determined by the T-DAI is always smaller than or equal to the ACK/NACK codebook determined according to the size of the feedback window, as shown in fig. 2A and fig. 2B, fig. 2A shows a DAI structure in FDD, and fig. 2B shows a DAI structure in TDD. Where both the C-DAI and the T-DAI are 2 bits, the indication is shown in Table 2 for FDD and in Table 3 for TDD.

TABLE 2 values of C-DAI and T-DAI (Value of counter DAI and total DAI)

TABLE 3 values of C-DAI and T-DAI (Value of counter DAI and total DAI)

When the values expressed by the C-DAI and the T-DAI exceed 4, the same 2-bit DAI state is multiplexed in a modulo-4 manner to indicate that the probability of continuously losing 4 data packets is very small in the system, so the UE can determine which value of the multiple values is indicated at this time according to the received DAI value, for example, the UE receives C-DAI equal to 1 and T-DAI equal to 1, and the UE has received 4 data packets before the data packet, and then the value indicated by the C-DAI and the T-DAI at this time is considered to be 5.

At present, when dynamic ACK/NACK codebook is used, the values indicated by C-DAI and T-DAI are only counted according to the PDSCH with the corresponding PDCCH/EPDCCH and the number of PDCCH/EPDCCH indicating the release of the downlink Semi-Persistent Scheduling (SPS); the SPS service can be configured on the main component carrier, namely the PDCCH/EPDCCH is activated through the SPS to trigger the transmission of the SPS PDSCH, the SPS periodically transmits in an SPS subframe according to a preconfigured period before the PDCCH/EPDCCH which indicates the SPS resource release is not received, and if the SPS subframe has a dynamically scheduled PDSCH, namely a base station sends a PDSCH with the corresponding PDCCH/EPDCCH in the SPS subframe, the data information of the SPS PDSCH is packed into the dynamic PDSCH for transmission; therefore, if the feedback window includes the SPS subframe, as shown in fig. 3, for FDD, the UE receives PDCCH/EPDCCH with C-DAI of 2 on carrier (CC)3, so that it can be determined that there is 1 carrier packet loss before carrier 3, but the User Equipment (UE) cannot determine whether carrier 1 packet loss or carrier 2 packet loss, where in case 1: the UE considers that the carrier 1 has packet loss and no transmission exists on the carrier 2, and then the UE considers that the SPS PDSCH is packaged into the dynamic PDSCH for transmission at the moment, namely the feedback window does not have ACK/NACK feedback information of the SPS PDSCH, so that 6-bit ACK/NACK feedback information needs to be generated according to the indication of the T-DAI; case 2: and the UE considers that the carrier 2 has packet loss, receives the SPS PDSCH on the carrier 1 according to the SPS resources, and obtains ACK/NACK feedback information of the SPS PDSCH, namely the UE judges that the feedback window has the ACK/NACK feedback information of the SPS PDSCH, and 1-bit SPS PDSCH feedback information is required to be added on the basis of 6-bit information determined according to the indication of the T-DAI, namely 7-bit ACK/NACK feedback information is fed back. In the two cases, the number of ACK/NACK feedback bits of the UE is different, and if the actual scheduled transmission of the base station is inconsistent with the understanding of the UE, for example, the base station actually sends the dynamic PDSCH on the carrier 1, i.e., the SPS PDSCH is packed into the dynamic PDSCH for transmission, and the UE understands as case 2, or the base station actually sends the SPS PDSCH on the carrier 1 and sends the dynamic PDSCH on the carrier 2, and the UE understands as case 1, both of them will cause the base station and the UE to have inconsistent understanding of the number of ACK/NACK feedback bits, thereby causing the base station to receive the ACK/NACK erroneously. The TDD case shown in fig. 4 is the same. There is currently no clear solution to this problem.

In summary, if the terminal configures the SPS service, when the existing dynamic ACK/NACK codebook performs feedback of ACK/NACK feedback information, there may be inconsistency in understanding of the ACK/NACK codebook by the base station and the UE, thereby causing erroneous ACK/NACK reception by the base station.

Disclosure of Invention

The embodiment of the invention provides a method and a device for determining an ACK/NACK feedback sequence, which solve the problem that the understanding of a terminal on ACK/NACK codebook is inconsistent when a terminal loses packets and a base station understands the ACK/NACK codebook.

In a first aspect, a method for determining an ACK/NACK feedback sequence includes:

determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the received downlink allocation index DAI;

and when determining that the SPS service is configured and/or an SPS subframe exists in a subframe set which needs ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number.

In a possible implementation manner, the set number of bits is 1.

In one possible implementation manner, the DAI is transmitted in a physical downlink control channel indicating release of downlink SPS resources or a physical downlink control channel having a corresponding physical downlink shared channel.

In one possible implementation, the DAI includes: C-DAI and T-DAI, wherein the C-DAI represents the DAI used for accumulating the count, and the T-DAI represents the DAI used for indicating the total scheduling data amount.

In one possible implementation, for frequency division duplex FDD,

the C-DAI indicates that the carriers of the physical downlink shared channel of the corresponding physical downlink control channel exist and the accumulated number of the carriers of the physical downlink control channel which indicates the downlink SPS resource release exists until the current carrier according to the ascending sequence of the carrier numbers;

and the T-DAI indicates that the carrier of the physical downlink shared channel of the corresponding physical downlink control channel exists and the total number of the carriers of the physical downlink control channel which indicates the downlink SPS resource release exists.

In one possible implementation, for time division duplex TDD,

the C-DAI indicates that the carrier and the subframe pairs of the physical downlink shared channel of the corresponding physical downlink control channel exist and the accumulated number of the carrier and the subframe pairs of the physical downlink control channel which indicates the release of the downlink SPS resources exists from the ascending order of the carrier numbers to the current carrier and from the ascending order of the subframe numbers to the current subframe;

and the T-DAI indicates that the total number of the carrier wave and the subframe pair of the physical downlink shared channel of the corresponding physical downlink control channel and the carrier wave and the subframe pair of the physical downlink control channel indicating the downlink SPS resource release exist until the current subframe.

In one possible implementation, determining that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n includes:

if the fact that the SPS subframe is contained in the subframe set which needs to be subjected to ACK/NACK feedback in the uplink subframe n on the main member carrier is determined, determining that the SPS subframe exists in the subframe set which needs to be subjected to ACK/NACK feedback in the uplink subframe n;

and/or

And if the physical downlink control channel indicating the activation of the downlink SPS resources is received, determining that the SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n.

In one possible implementation, generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number includes:

if a physical downlink shared channel without a corresponding physical downlink control channel is received, mapping ACK/NACK feedback information of a set bit number of the physical downlink shared channel without the corresponding physical downlink control channel to a set position in the ACK/NACK feedback sequence; or

And if the received physical downlink shared channels all have corresponding physical downlink control channels, generating NACK feedback information with a set bit number, and mapping the NACK feedback information to a set position in the ACK/NACK feedback sequence.

In a possible implementation manner, the set positions in the ACK/NACK feedback sequence are: and the front or the back of a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number.

In a possible implementation manner, the physical downlink control channel is a legacy physical downlink control channel and/or an enhanced physical downlink control channel.

In a second aspect, a computer-readable storage medium is provided, in which executable program code is stored, the program code being adapted to implement the method of the first aspect.

In a third aspect, an apparatus for determining an ACK/NACK feedback sequence includes:

the determining module is used for determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the received downlink allocation index DAI;

and the generating module is used for determining the sum of the first ACK/NACK feedback bit number and the set bit number as a second ACK/NACK feedback bit number and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number when determining that the SPS subframe exists in the subframe set which is configured with the semi-persistent scheduling SPS service and/or needs to carry out ACK/NACK feedback in the uplink subframe n.

Please refer to the related description in the method of the first aspect for the set bit number, the DAI, and the pdcch, which is not described herein again.

In a possible implementation manner, when the determining module determines that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n, the determining module includes:

if the fact that the SPS subframe is contained in the subframe set which needs to be subjected to ACK/NACK feedback in the uplink subframe n on the main member carrier is determined, determining that the SPS subframe exists in the subframe set which needs to be subjected to ACK/NACK feedback in the uplink subframe n; and/or

In a possible implementation manner, when the generating module generates an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number, the generating module includes:

In a fourth aspect, a terminal includes: a transceiver, and at least one processor connected with the transceiver, wherein:

the processor reads the program in the memory and executes the following processes:

determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the DAI received by the transceiver; when determining that an SPS service is configured and/or an SPS subframe exists in a subframe set which needs ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number;

a transceiver for receiving and transmitting data under the control of the processor.

In one possible implementation, the determining, by the processor, that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n includes:

And if the physical downlink control channel indicating the activation of the downlink SPS resources is received through the transceiver, determining that the SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n.

In one possible implementation manner, the generating, by the processor, an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number includes:

if a physical downlink shared channel without a corresponding physical downlink control channel is received through a transceiver, mapping ACK/NACK feedback information of a set bit number of the physical downlink shared channel without the corresponding physical downlink control channel to a set position in an ACK/NACK feedback sequence;

or

And if the physical downlink shared channels received by the transceiver all have corresponding physical downlink control channels, generating NACK feedback information with a set bit number, and mapping the NACK feedback information to a set position in the ACK/NACK feedback sequence.

In a fifth aspect, a method for determining an ACK/NACK feedback sequence includes:

determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the transmitted downlink allocation index DAI;

and when determining that the SPS service is configured and/or the SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and the set bit number as a second ACK/NACK feedback bit number, and receiving an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number.

and/or

And if the physical downlink control channel indicating the activation of the downlink SPS resources is sent, determining that the SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n.

In a possible implementation manner, after receiving the ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number, the method further includes:

if the physical downlink shared channel without the corresponding physical downlink control channel is sent, determining that the feedback information of the set bit number at the set position in the ACK/NACK feedback sequence is the ACK/NACK feedback information of the physical downlink shared channel without the corresponding physical downlink control channel; or

And if the sent physical downlink shared channels all have corresponding physical downlink control channels, determining the feedback information with the set bit number at the set position in the ACK/NACK feedback sequence as NACK feedback information.

In a possible implementation manner, the set positions in the ACK/NACK feedback sequence are: a first ACK/NACK feedback sequence corresponding to the first ACK/NACK feedback bit number.

A sixth aspect provides a computer readable storage medium having stored therein executable program code for implementing the method of the fifth aspect.

In a seventh aspect, an ACK/NACK feedback sequence determination apparatus, the apparatus includes:

the determining module is used for determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the sent downlink allocation index DAI;

and the receiving module is used for determining the sum of the first ACK/NACK feedback bit number and the set bit number as a second ACK/NACK feedback bit number when determining that the SPS service is configured and/or the SPS subframe exists in the subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n, and receiving the ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number.

In a possible implementation manner, the determining module determines that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n, including:

and/or

In a possible implementation manner, the determining module is further configured to:

In an eighth aspect, a base station includes a transceiver and at least one processor coupled to the transceiver, wherein:

determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the transmitted downlink allocation index DAI; when determining that a semi-persistent scheduling (SPS) service is configured and/or an SPS subframe exists in a subframe set which needs to perform ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and receiving an ACK/NACK feedback sequence through the transceiver according to the second ACK/NACK feedback bit number;

the transceiver receives and transmits data under the control of the processor.

and/or

And if the transceiver sends a physical downlink control channel indicating the activation of the downlink SPS resources, determining that an SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in an uplink subframe n.

In a possible implementation manner, after receiving, by the transceiver, an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number, the processor further performs:

if the transceiver sends a physical downlink shared channel without a corresponding physical downlink control channel, determining that the feedback information of the set bit number at the set position in the ACK/NACK feedback sequence is the ACK/NACK feedback information of the physical downlink shared channel without the corresponding physical downlink control channel; or

And if the physical downlink shared channels sent by the transceiver all have corresponding physical downlink control channels, determining that the feedback information with the set bit number at the set position in the ACK/NACK feedback sequence is NACK feedback information.

In the method and the device provided by the embodiment of the invention, when a terminal side determines that a semi-persistent scheduling (SPS) service is configured and/or an SPS subframe exists in a subframe set which needs to perform ACK/NACK feedback in an uplink subframe n, the sum of a first ACK/NACK feedback bit number determined according to a received DAI and a set bit number is determined as a second ACK/NACK feedback bit number, and an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number is generated; when determining that a semi-persistent scheduling (SPS) service is configured and/or an SPS subframe exists in a subframe set which needs to carry out ACK/NACK feedback in an uplink subframe n, a base station side determines the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and receives an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number; because the feedback information with the additionally set bit number is always supposed to exist in the dynamic ACK/NACK codebook determined according to the DAI, the inconsistency between the terminal packet loss and the understanding of the base station on the ACK/NACK codebook is avoided.

Drawings

Fig. 1 is a schematic diagram of

PUCCH format

4 and 5 formats;

FIG. 2A is a diagram of a DAI in FDD;

FIG. 2B is a diagram of DAI in TDD;

fig. 3 is a schematic diagram of a DAI with SPS configured in FDD;

FIG. 4 is a diagram of a DAI with SPS configured in TDD;

fig. 5 is a schematic diagram of a method for determining an ACK/NACK feedback sequence according to an embodiment of the present invention;

fig. 6 is a schematic diagram of another ACK/NACK feedback sequence determination method according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an ACK/NACK feedback sequence determining apparatus according to an embodiment of the present invention;

fig. 8 is a schematic diagram of another ACK/NACK feedback sequence determining apparatus according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a terminal according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a base station according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

The method for determining the ACK/NACK feedback sequence provided by the embodiment of the invention, as shown in FIG. 5, comprises the following processes:

s51, determining the first ACK/NACK feedback bit number needing ACK/NACK feedback according to the received DAI.

And the DAI is transmitted in a physical downlink control channel indicating the release of the downlink SPS resources or a physical downlink control channel with a corresponding physical downlink shared channel.

And S52, when determining that the SPS service is configured and/or the SPS subframe exists in the subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and the set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number.

Optionally, the set number of bits is 1.

Optionally, if it is determined that the subframe set on the primary component carrier, which needs to perform ACK/NACK feedback in the uplink subframe n, includes an SPS subframe, it is determined that an SPS subframe exists in the subframe set, which needs to perform ACK/NACK feedback in the uplink subframe n; and/or if a physical downlink control channel indicating the activation of the downlink SPS resources is received, determining that an SPS subframe exists in a subframe set which needs ACK/NACK feedback in an uplink subframe n.

In the embodiment of the invention, when determining that a semi-persistent scheduling (SPS) service is configured and/or an SPS subframe exists in a subframe set which needs to perform ACK/NACK feedback in an uplink subframe n, determining the sum of a first ACK/NACK feedback bit number determined according to a received DAI and a set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number.

In the embodiment of the present invention, the execution subjects of the steps S51 to S52 are terminals.

Optionally, the set number of bits is 1.

In the embodiment of the invention, the DAIs comprise T-DAIs and C-DAIs, wherein the C-DAIs represent DAIs used for accumulating counts, and the T-DAIs represent DAIs used for indicating total scheduling data quantity.

In a possible implementation manner, for FDD, the C-DAI indicates that there are carriers of a physical downlink shared channel of a corresponding physical downlink control channel and the cumulative number of carriers of a physical downlink control channel indicating release of downlink SPS resources, in ascending order of carrier numbers until a current carrier; and the T-DAI indicates that the carrier of the physical downlink shared channel of the corresponding physical downlink control channel exists and the total number of the carriers of the physical downlink control channel which indicates the downlink SPS resource release exists.

And the T-DAI values in the physical downlink control channel for scheduling the physical downlink shared channel and the physical downlink control channel for indicating the downlink SPS resource release in the same subframe are the same.

In another possible implementation manner, for TDD, the C-DAI indicates that there are carrier and subframe pairs of a physical downlink shared channel of a corresponding physical downlink control channel and an accumulated number of carrier and subframe pairs of a physical downlink control channel indicating release of downlink SPS resources, from the ascending order of carrier numbers to the current carrier and from the ascending order of subframe numbers to the current subframe; and the T-DAI indicates that the total number of the carrier wave and the subframe pair of the physical downlink shared channel of the corresponding physical downlink control channel and the carrier wave and the subframe pair of the physical downlink control channel indicating the downlink SPS resource release exist until the current subframe.

And updating the T-DAI by subframes in a subframe set which needs to perform ACK/NACK feedback in the same uplink subframe.

Based on any of the above embodiments, in implementation, the generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number in S52 includes the following two possible implementations:

in the method 1, if a physical downlink shared channel (i.e., SPSPDSCH) without a corresponding physical downlink control channel is received, the ACK/NACK feedback information with the set bit number of the physical downlink shared channel without the corresponding physical downlink control channel is mapped to the set position in the ACK/NACK feedback sequence.

Optionally, the set positions in the ACK/NACK feedback sequence are: and the front or the back of a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number.

In this way, the ACK/NACK feedback sequence is configured by a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number and ACK/NACK feedback information of a set bit number of the physical downlink shared channel having no corresponding physical downlink control channel.

And in the mode 2, if the received physical downlink shared channels all have corresponding physical downlink control channels (namely SPSPDSCH), generating NACK feedback information with set bit number, and mapping the NACK feedback information to a set position in the ACK/NACK feedback sequence.

In this way, the ACK/NACK feedback sequence is configured by a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number and NACK feedback information of a set bit number generated.

Based on any of the above embodiments, the physical downlink control channel in the embodiments of the present invention is a conventional Physical Downlink Control Channel (PDCCH) and/or an Enhanced Physical Downlink Control Channel (EPDCCH).

The TTI length of the physical downlink control channel is equal to 1ms, or less than 1ms, or more than 1 ms. The embodiment of the present invention is not limited thereto.

Based on the same inventive concept, another ACK/NACK feedback sequence determination method is provided in the embodiments of the present invention, as shown in fig. 6, the method includes:

s61, determining a first ACK/NACK feedback bit number needing ACK/NACK feedback according to the sent downlink allocation index DAI;

and S62, when determining that the SPS service is configured and/or the SPS subframe exists in the subframe set which needs to carry out ACK/NACK feedback in the uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and the set bit number as a second ACK/NACK feedback bit number, and receiving an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number.

In the embodiment of the invention, when determining that the SPS service is configured and/or the SPS subframe exists in the subframe set which needs ACK/NACK feedback in the uplink subframe n, the sum of the first ACK/NACK feedback bit number and the set bit number is determined as the second ACK/NACK feedback bit number, and the ACK/NACK feedback sequence is received according to the second ACK/NACK feedback bit number.

In the embodiment of the present invention, the executing subjects of the steps S51 to S52 are network side devices, such as a base station.

Please refer to the relevant description in the embodiment shown in fig. 5 for the set bit number, the DAI, and the pdcch, which is not described herein again.

In an implementation, the determining, in S62, that there is an SPS subframe in the subframe set in which ACK/NACK feedback needs to be performed in the uplink subframe n includes:

and/or

Based on any of the above embodiments, after receiving the ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number in S62, the method further includes:

if the physical downlink shared channel without the corresponding physical downlink control channel is sent, determining that the feedback information of the set bit number at the set position in the ACK/NACK feedback sequence is the ACK/NACK feedback information of the physical downlink shared channel without the corresponding physical downlink control channel;

or

Optionally, the set positions in the ACK/NACK feedback sequence are: a first ACK/NACK feedback sequence corresponding to the first ACK/NACK feedback bit number.

The following describes in detail a method for determining an ACK/NACK feedback sequence according to an embodiment of the present invention with two specific embodiments.

Example 1: as shown in fig. 3, it is assumed that the transmission mode of each carrier is 1TB, i.e., if ACK/NACK feedback is required for each carrier, it corresponds to 1-bit ACK/NACK; assume that carrier 1 is the primary component carrier and the current subframe i is the SPS subframe:

the terminal side judges that the indication of the T-DAI is 6 according to that downlink transmission is actually received on 4 carriers, and the finally received C-DAI is 1 and T-DAI is 2, namely 6 carriers have the carrier of the physical downlink shared channel of the corresponding physical downlink control channel and/or the transmission of the physical downlink control channel indicating the release of the downlink SPS resources, namely the first ACK/NACK feedback bit number determined according to the DAI is 6 bits;

the terminal determines the actual ACK/NACK feedback bit number O due to the existence of the SPS subframe in the feedback window ^ACK6+ 1-7 bits;

the terminal maps the received ACK/NACK of the downlink transmission to the corresponding position in the 6-bit first ACK/NACK feedback sequence according to the C-DAI sequence, generates NACK for the position which does not receive the downlink transmission, and obtains a 6-bit first ACK/NACK feedback sequence NACK, o_cc3,o_cc4,o_cc5,o_cc7NACK, where o_cciFeeding back a bit for ACK/NACK of a corresponding carrier;

the terminal determines that there is a carrier packet loss before the carrier 3 according to the C-DAI ═ 2 in the physical downlink control channel received by the carrier 3, which specifically includes the following cases:

case 1: supposing that the packet loss of the carrier 1 is judged, namely the SPS PDSCH is packaged and transmitted in the dynamic PDSCH, the SPS PDSCH does not exist in a feedback window, the terminal generates 1-bit NACK, the 1-bit NACK is mapped after the first ACK/NACK feedback sequence, namely the last position in the 7-bit final ACK/NACK feedback sequence, and the final 7-bit ACK/NACK feedback sequence NACK, o, is obtained_cc3,o_cc4,o_cc5,o_cc7NACK, NACK, i.e. in the final 7-bit ACK/NACK feedback sequence o_i，i＝0,1，…，O^ACKIn-1, o₀～o₅For the first ACK/NACK feedback sequence determined from the DAI, o₆＝NACK；

Case 2: assuming that the carrier 2 is judged to be lost, that is, SPS PDSCH transmission exists on the carrier 1, the terminal generates ACK/NACK corresponding to 1-bit SPSPDSCH, and maps the ACK/NACK to the last position in the first ACK/NACK feedback sequence, that is, the 7-bit final ACK/NACK feedback sequence, to obtain a final 7-bit ACK/NACK feedback sequence NACK, o_cc3,o_cc4,o_cc5,o_cc7NACK, ACK/NACK, i.e. in the final 7-bit ACK/NACK feedback sequence o_i，i＝0,1，…，O^ACKIn-1, o₀～o₅For the first ACK/NACK feedback sequence determined from the DAI, o₆1-bit ACK/NACK for SPS PDSCH;

in both cases, O^ACKAll are 7 bits, although the final ACK/NACK feedback sequence o depends on the different terminal judgment conditions_i，i＝0,1，…，O^ACKThe physical meanings of the last 1 bit in 1 are different, but the mapping position and the bit number of the first ACK/NACK feedback sequence determined according to the DAI are the same, so that the base station and the terminal can understand the part of feedback information consistently; for the last 1 bit feedback information:

if the base station really sends the SPS PDSCH on the carrier 1, the dynamic PDSCH sent on the carrier 2 or a physical downlink control channel indicating the downlink SPS resource release, if the terminal understands the situation 2, the base station and the terminal understand completely consistent, if the terminal understands the situation 1, the feedback information of the SPS PDSCH received by the base station is NACK, and retransmission is only needed (if the terminal does not have the situation similar to the packet loss in the next retransmission, namely the information is received on the carrier 1, whether the SPS PDSCH exists can be directly judged, so that the situation that NACK is always generated on the SPS PDSCH is avoided);

if the base station packs the SPS PDSCH into the dynamic PDSCH on the carrier 1 for transmission, if the terminal understands that the case 1 is the case 1, the base station and the terminal understand completely the same, and if the terminal understands that the case 2 is the case 2, the base station may ignore the last 1-bit feedback information, and think that the transmission is only occupied for ensuring that the ACK/NACK feedback bit number is constant, and there is no actual physical meaning.

Example 2: as shown in fig. 4, it is assumed that the transmission mode of each carrier is 1TB, that is, if ACK/NACK feedback is required for each carrier, it corresponds to 1-bit ACK/NACK; assuming that carrier 1 is a primary component carrier, the number of downlink subframes on each carrier, which need to perform ACK/NACK feedback in the same uplink subframe n, is 2, that is, M is 2, and subframe n-k2 (that is, sf2) is an SPS subframe:

the terminal side judges that the indication of the T-DAI is 13 according to that downlink transmission is actually received on 9 carriers and subframe pairs (for example, carrier 1 and subframe n-k1 are a pair, which corresponds to one downlink transmission, and so on), and the last received C-DAI is 4 and T-DAI is 1, that is, carriers of a physical downlink shared channel (pdcch) corresponding to the physical downlink control channel and/or a physical downlink control channel (SPS) indicating downlink SPS resource release exist on the 13 carriers and subframe pairs in total, that is, the first ACK/NACK feedback bit number determined according to the DAI is 13 bits;

the terminal determines the actual ACK/NACK feedback bit number O due to the existence of the SPS subframe in the feedback window^ACK13+ 1-14 bits;

the terminal maps the received ACK/NACK of the downlink transmission to the corresponding position in the 13-bit first ACK/NACK feedback sequence according to the C-DAI sequence, generates NACK for the position which does not receive the downlink transmission, and obtains a 13-bit first ACK/NACK feedback sequence NACK, o_cc2,sf1,o_cc3,sf1,NACK,o_cc5,sf1,o_cc7,sf1,o_cc8,sf1,NACK,o_cc3,sf2,o_cc4,sf2,o_cc5,sf2,o_cc7,sf2NACK, where o_cci,sfjFeedback bits for ACK/NACK for corresponding carrier and subframe pairs;

the terminal determines that there is a carrier packet loss before the carrier 3 on the subframe n-k2 (i.e., sf2) according to C-DAI ═ 4 in the physical downlink control channel received at the carrier 8 and the subframe n-k1 (i.e., sf1) and C-DAI ═ 1 in the physical downlink control channel received at the carrier 3 and the subframe n-k2 (i.e., sf2), which specifically includes the following cases:

case 1: assuming that it is determined that carrier 1 packet loss occurs on subframe n-k2 (i.e., sf2), i.e., SPS PDSCH is packed for transmission in dynamic PDSCH, no SPS PDSCH is present in the feedback window, the terminal generates 1-bit NACK, and maps the 1-bit NACK to the last position in the first ACK/NACK feedback sequence, i.e., the 14-bit final ACK/NACK feedback sequence, to obtain the final 14-bit ACK/NACK feedback sequence NACK, o_cc2,sf1,o_cc3,sf1,NACK,o_cc5,sf1,o_cc7,sf1,o_cc8,sf1,NACK,o_cc3,sf2,o_cc4,sf2,o_cc5,sf2,o_cc7,sf2NACK, NACK, i.e. at the mostFinal 14-bit ACK/NACK feedback sequence o_i，i＝0,1，…，O^ACKIn-1, o₀～o₁₂For the first ACK/NACK feedback sequence determined from the DAI, o₁₃＝NACK；

Case 2: assuming that it is determined that carrier 2 on subframe n-k2 (i.e., sf2) has lost packet, i.e., there is SPS PDSCH transmission on carrier 1, the terminal generates ACK/NACK corresponding to 1-bit SPS PDSCH, and maps the ACK/NACK to the last position in the first ACK/NACK feedback sequence, i.e., the final 13-bit ACK/NACK feedback sequence, to obtain the final 13-bit ACK/NACK feedback sequence NACK, o_cc2,sf1,o_cc3,sf1,NACK,o_cc5,sf1,o_cc7,sf1,o_cc8,sf1,NACK,o_cc3,sf2,o_cc4,sf2,o_cc5,sf2,o_cc7,sf2NACK, ACK/NACK, i.e. in the final 14-bit ACK/NACK feedback sequence o_i，i＝0,1，…，O^ACKIn-1, o₀～o₁₂For the first ACK/NACK feedback sequence determined from the DAI, o₁₃1-bit ACK/NACK for SPS PDSCH;

in both cases, O^ACKAll are 14 bits, although the final ACK/NACK feedback sequence o depends on the different terminal judgment conditions_i，i＝0,1，…，O^ACKThe physical meanings of the last 1 bit in 1 are different, but the mapping position and the bit number of the first ACK/NACK feedback sequence determined according to the DAI are the same, so that the base station and the terminal can understand the part of feedback information consistently; for the last 1 bit feedback information:

if the base station really transmits the SPS PDSCH on the carrier 1 of the subframe n-k2 (namely sf2), and the dynamic PDSCH transmitted on the carrier 2 of the subframe n-k2 (namely sf2) or a physical downlink control channel indicating the release of downlink SPS resources, if the terminal understands the situation 2, the understanding of the base station and the terminal is completely consistent, and if the terminal understands the situation 1, the feedback information of the SPS PDSCH received by the base station is NACK, retransmission can be carried out (if the terminal does not have the packet loss situation similar to the above situation, namely the information is received on the carrier 1 of the subframe n-k2 (namely sf2), the base station can directly judge whether the SPS PDSCH exists, so that the situation that NACK is always generated on the SPS PDSCH is avoided);

if the base station packs the SPS PDSCH into the dynamic PDSCH for transmission on carrier 1 on subframe n-k2 (i.e., sf2), the base station and the terminal understand completely the same if the terminal understands case 1, and if the terminal understands case 2, the base station may ignore the last 1-bit feedback information, and consider that the transmission is only occupied for ensuring that the ACK/NACK feedback bit number is constant, and has no practical physical meaning.

It should be noted that, in the above embodiment, only the transmission mode of each carrier only supports 1TB transmission as an example, when the transmission mode of all or part of the carriers supports 2TB transmission and whether spatial combining is configured, only determining the first ACK/NACK feedback bit number and the first ACK/NACK feedback sequence according to the DAI is affected, and the process of mapping 1-bit feedback information at the last position of the final ACK/NACK feedback sequence is not affected, which is also included in the present invention.

In addition, in the above embodiment, it is assumed that the subframe on the primary component carrier in the feedback window includes an SPS subframe, that is, at this time, as long as the feedback window includes an SPS subframe determined according to the periodic configuration of the SPS service, regardless of whether the SPS service in the SPS subframe is activated (i.e., whether a physical downlink control channel indicating activation of downlink SPS resources is received), corresponding operations in the above embodiment are performed. Certainly, the condition may also be replaced by that the subframe on the primary component carrier in the feedback window includes an SPS subframe and a physical downlink control channel indicating activation of downlink SPS resources has been received, that is, the SPS subframe in the feedback window has been activated and may be used to transmit an SPS PDSCH, that is, in the above embodiment 1, when the condition is that the current subframe i is an SPS subframe and a physical downlink control channel indicating activation of downlink SPS resources has been received, corresponding operations in the embodiment are performed; in the above embodiment 2, when the condition is that the subframe n-k2 (i.e. sf2) is an SPS subframe and a physical downlink control channel indicating activation of downlink SPS resources has been received, the corresponding operations in the embodiment are performed; or the condition may be replaced by that the SPS service is configured, that is, the feedback window does not necessarily include an SPS subframe determined according to the periodic configuration of the SPS service, and does not necessarily receive a physical downlink control channel indicating activation of the downlink SPS resource, so as long as the terminal is configured with the corresponding configuration, for example, the period, of the SPS service, the corresponding operations in the above embodiments are all performed.

The above method process flow may be implemented by a software program, which may be stored in a storage medium, and when the stored software program is called, the above method steps are performed.

Based on the same inventive concept, an embodiment of the present invention provides an ACK/NACK feedback sequence determination apparatus corresponding to the embodiment shown in fig. 5, as shown in fig. 7, where the apparatus includes:

a determining module 71, configured to determine, according to the received DAI, a first ACK/NACK feedback bit number that needs to be subjected to ACK/NACK feedback;

a generating module 72, configured to determine, when it is determined that an SPS subframe exists in a subframe set in which a semi-persistent scheduling SPS service is configured and/or ACK/NACK feedback needs to be performed in an uplink subframe n, a sum of the first ACK/NACK feedback bit number and a set bit number is a second ACK/NACK feedback bit number, and generate an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number.

Optionally, when determining that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n, the determining module includes:

Based on any of the foregoing embodiments, optionally, when the generating module generates the ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number, the generating module includes:

Based on the same inventive concept, an embodiment of the present invention provides an ACK/NACK feedback sequence determination apparatus corresponding to the embodiment shown in fig. 6, as shown in fig. 8, where the apparatus includes:

a determining module 81, configured to determine, according to the sent downlink assignment index DAI, a first ACK/NACK feedback bit number that needs to be subjected to ACK/NACK feedback;

and a receiving module 82, configured to determine, when it is determined that an SPS subframe exists in a subframe set in which a semi-persistent scheduling SPS service is configured and/or ACK/NACK feedback needs to be performed in an uplink subframe n, a sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and receive an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number.

Optionally, the determining module determines that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n, including:

and/or

Optionally, the determining module is further configured to:

Based on the same inventive concept, an embodiment of the present invention provides a terminal, as shown in fig. 9, where the terminal includes: a transceiver 91, and at least one processor 92 connected to the transceiver 91, wherein:

a processor 92 for reading the program in the memory 93 and executing the following processes:

determining a first ACK/NACK feedback bit number which needs to perform ACK/NACK feedback according to the DAI received by the transceiver 91; when determining that an SPS service is configured and/or an SPS subframe exists in a subframe set which needs ACK/NACK feedback in an uplink subframe n, determining the sum of the first ACK/NACK feedback bit number and a set bit number as a second ACK/NACK feedback bit number, and generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number;

a transceiver 91 for receiving and transmitting data under the control of the processor 92.

Wherein in fig. 9 the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 92 and various circuits of memory represented by memory 93 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 91 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 94 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 92 is responsible for managing the bus architecture and general processing, and the memory 93 may store data used by the processor 92 in performing operations.

Optionally, the determining, by the processor, that an SPS subframe exists in a subframe set in which ACK/NACK feedback needs to be performed in an uplink subframe n includes:

Based on any of the foregoing embodiments, optionally, the generating, by the processor, an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number includes:

or

Based on the same inventive concept, an embodiment of the present invention provides a base station, as shown in fig. 10, the base station includes a transceiver 101 and at least one processor 102 connected to the transceiver 101, wherein:

a processor 102 for reading the program in the memory 103 and executing the following processes:

a transceiver 101 for receiving and transmitting data under the control of a processor.

Where in fig. 10 the bus architecture may include any number of interconnected buses and bridges, in particular one or more processors represented by processor 102 and various circuits of memory represented by memory 103, linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 101 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 102 is responsible for managing the bus architecture and general processing, and the memory 103 may store data used by the processor 102 in performing operations.

and/or

Optionally, after the processor receives the ACK/NACK feedback sequence through the transceiver according to the second ACK/NACK feedback bit number, the processor further performs:

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for determining an ACK/NACK feedback sequence, the method comprising:

2. The method of claim 1, wherein the set number of bits is 1.

3. The method of claim 1, wherein the DAI is transmitted in a physical downlink control channel indicating a release of downlink SPS resources or a physical downlink control channel having a corresponding physical downlink shared channel.

4. The method of claim 1, wherein the DAI comprises: C-DAI and T-DAI, wherein the C-DAI represents the DAI used for accumulating the count, and the T-DAI represents the DAI used for indicating the total scheduling data amount.

5. The method of claim 4, wherein for frequency division duplex, FDD,

6. The method of claim 4, wherein for time division duplex, TDD,

7. The method of claim 1, wherein determining that an SPS subframe exists in a set of subframes requiring ACK/NACK feedback in an uplink subframe n, comprises:

and/or

8. The method of any of claims 1 to 7, wherein generating an ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number comprises:

9. The method of claim 8, wherein the set positions in the ACK/NACK feedback sequence are: and the front or the back of a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number.

10. The method according to claim 3 or 5 or 6 or 7, wherein the physical downlink control channel is a legacy physical downlink control channel and/or an enhanced physical downlink control channel.

11. An apparatus for determining an ACK/NACK feedback sequence, the apparatus comprising:

12. The apparatus of claim 11, wherein the set number of bits is 1.

13. The apparatus of claim 11, wherein the DAI is transmitted in a physical downlink control channel indicating a release of downlink SPS resources or a physical downlink control channel having a corresponding physical downlink shared channel.

14. The apparatus of claim 11, wherein the DAI comprises: C-DAI and T-DAI, wherein the C-DAI represents the DAI used for accumulating the count, and the T-DAI represents the DAI used for indicating the total scheduling data amount.

15. The apparatus of claim 14, wherein for frequency division duplex, FDD,

16. The apparatus of claim 14, wherein for time division duplex, TDD,

17. The apparatus as claimed in claim 11, wherein the determining module, when determining that there is an SPS subframe in the set of subframes requiring ACK/NACK feedback in uplink subframe n, comprises:

18. The apparatus according to any one of claims 11 to 17, wherein the generating module, when generating the ACK/NACK feedback sequence corresponding to the second ACK/NACK feedback bit number, includes:

19. The apparatus of claim 18, wherein the set position in the ACK/NACK feedback sequence is: and the front or the back of a first ACK/NACK feedback sequence generated according to the first ACK/NACK feedback bit number.

20. The apparatus according to claim 13 or 15 or 16 or 17, wherein the physical downlink control channel is a legacy physical downlink control channel and/or an enhanced physical downlink control channel.

21. A method for determining an ACK/NACK feedback sequence, the method comprising:

22. The method of claim 21, wherein the set number of bits is 1.

23. The method as claimed in claim 21, wherein the DAI is transmitted in a physical downlink control channel indicating a release of downlink SPS resources or a physical downlink control channel having a corresponding physical downlink shared channel.

24. The method of claim 21, wherein the DAI comprises: C-DAI and T-DAI, wherein the C-DAI represents the DAI used for accumulating the count, and the T-DAI represents the DAI used for indicating the total scheduling data amount.

25. The method of claim 24, wherein for frequency division duplex, FDD,

26. The method of claim 24, wherein for time division duplex, TDD,

27. The method of claim 21, wherein determining that an SPS subframe exists in a set of subframes requiring ACK/NACK feedback in uplink subframe n comprises:

and/or

28. The method according to any of claims 21 to 27, wherein after receiving an ACK/NACK feedback sequence according to the second ACK/NACK feedback bit number, further comprising:

29. The method of claim 28, wherein the set positions in the ACK/NACK feedback sequence are: a first ACK/NACK feedback sequence corresponding to the first ACK/NACK feedback bit number.

30. The method according to claim 23 or 25 or 26 or 27, wherein the physical downlink control channel is a legacy physical downlink control channel and/or an enhanced physical downlink control channel.

31. An apparatus for determining an ACK/NACK feedback sequence, the apparatus comprising:

32. The apparatus of claim 31, wherein the set number of bits is 1.

33. The apparatus of claim 31, wherein the DAI is transmitted in a physical downlink control channel indicating a release of downlink SPS resources or a physical downlink control channel having a corresponding physical downlink shared channel.

34. The apparatus of claim 31, wherein the DAI comprises: C-DAI and T-DAI, wherein the C-DAI represents the DAI used for accumulating the count, and the T-DAI represents the DAI used for indicating the total scheduling data amount.

35. The apparatus of claim 34, wherein for frequency division duplex, FDD,

36. The apparatus of claim 34, wherein for time division duplex, TDD,

37. The apparatus as claimed in claim 31, wherein said determining module determines that there is an SPS subframe in the set of subframes requiring ACK/NACK feedback in uplink subframe n, comprising:

and/or

38. The apparatus of any of claims 31-37, wherein the determination module is further configured to:

39. The apparatus of claim 38, wherein the set position in the ACK/NACK feedback sequence is: a first ACK/NACK feedback sequence corresponding to the first ACK/NACK feedback bit number.

40. The apparatus according to claim 33 or 35 or 36 or 37, wherein the physical downlink control channel is a legacy physical downlink control channel and/or an enhanced physical downlink control channel.