CN104144041A

CN104144041A - Feedback information transmission method and device for downlink data

Info

Publication number: CN104144041A
Application number: CN201310164775.8A
Authority: CN
Inventors: 司倩倩; 高雪娟; 潘学明; 林亚男
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-05-07
Filing date: 2013-05-07
Publication date: 2014-11-12
Anticipated expiration: 2033-05-07
Also published as: CN104144041B

Abstract

The invention discloses a feedback information transmission method and device for downlink data. The method on a terminal side includes the steps that the downlink data are received on downlink subframes of all aggregated carriers respectively; for the downlink data received on the downlink subframe of each carrier, feedback information is generated; according to feedback corresponding relations on frequency bands where all the carriers are located, feedback information of the downlink data received on the corresponding downlink subframes in the feedback corresponding relations is transmitted on the available uplink subframes of the frequency bands where all the carriers are located. According to the technical scheme of the embodiment, the feedback corresponding relations of the downlink subframes corresponding to all the available uplink subframes on the instruction frequency bands are adopted for determining the feedback information of the downlink data needing feedback on the current uplink subframes so that the feedback information of the downlink data can be transmitted on the available uplink subframes of the frequency bands, and the transmission performance of the downlink data is improved.

Description

Feedback information transmission method and device for downlink data

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting feedback information of downlink data.

Background

In a subsequent version of a Long Term Evolution-advanced (LTE-a) system, a Carrier Aggregation (CA) technology is used to enable carriers (or cells) aggregated by a terminal (i.e., User Equipment (UE)) to use different frequency band (band) resources, i.e., an out-of-band discontinuous Carrier Aggregation (Inter-band CA) scenario.

In an Inter-band CA scenario, the same base station provides service to the terminal on a carrier (or cell) of the same frequency band. The frame structures used in different frequency bands may be the same or different. For example, the terminal communicates with a corresponding serving base station by using a Frequency Division Duplex (FDD) frame structure on each carrier in the same or different Frequency bands; or the terminal communicates with the corresponding serving base station by using a Time Division Duplex (TDD) frame structure on each carrier in the same or different frequency bands, wherein TDD uplink/downlink configurations used in different frequency bands may be the same or different; or, the terminal communicates with the corresponding serving base station by adopting an FDD frame structure on each carrier in a part of frequency bands, and communicates with the corresponding serving base station by adopting a TDD frame structure on each carrier in another part of frequency bands.

Communication between service base stations of a terminal is non-ideal backhaul (non-ideal backhaul), i.e., transmission delay between base stations is large. Therefore, in order to reduce the time delay for the terminal to feed back the correct acknowledgement/incorrect acknowledgement (ACK/NACK) information of the downlink data, the downlink carriers (or downlink carriers belonging to the same frequency band) served by the same base station are generally grouped into one group, and each group of downlink carriers corresponds to a specific Uplink carrier for feeding back the ACK/NACK information to the base station serving the group of downlink carriers through a Physical Uplink Control Channel (PUCCH) of the Uplink carrier. In a communication system, carriers are divided into uplink carriers and downlink carriers.

The terminal has the capability of multi-carrier simultaneous reception in downlink, that is, the terminal can simultaneously receive downlink data from different serving base stations in each downlink subframe. However, in consideration of the complexity and cost of radio frequency, the terminal only supports a single-frequency-band transmission capability in uplink, that is, only supports transmitting uplink signals on one frequency band to the base station serving the frequency band in each uplink subframe.

For a terminal working in an Inter-band CA scenario, the terminal needs to transmit ACK/NACK information of downlink data to different serving base stations on different uplink carriers, but the terminal only supports single-band transmission capability on an uplink, so that uplink subframes of the terminal need to be allocated among different frequency bands to ensure that the terminal only transmits uplink data in one frequency band in one uplink subframe.

After uplink subframes are allocated between different frequency bands, if the existing downlink data feedback scheme is used, such a problem may occur: according to a frame structure used on a frequency band where a certain carrier is located, an uplink subframe for performing ACK/NACK information feedback on downlink data is determined, but the uplink subframe is not allocated to the frequency band where the carrier is located, so that the ACK/NACK information of the downlink data cannot be fed back on the uplink subframe. The ACK/NACK information of downlink data transmitted by partial or even all downlink subframes cannot be fed back, and the performance of downlink data transmission is reduced.

Disclosure of Invention

The invention aims to provide a method and a device for transmitting feedback information of downlink data, which aim to solve the problem that the transmission performance of the downlink data is reduced because ACK/NACK information of partial or even all downlink data cannot be fed back.

The purpose of the invention is realized by the following technical scheme:

a method for transmitting feedback information of downlink data comprises the following steps:

respectively receiving downlink data on downlink subframes of each aggregated carrier;

respectively generating feedback information aiming at downlink data received on each downlink subframe of each carrier;

according to the feedback corresponding relation on the frequency band of each carrier, sending feedback information of downlink data received on a downlink subframe corresponding to the feedback corresponding relation on the frequency band of each carrier on an uplink subframe which can be used by the frequency band of each carrier; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

transmitting downlink data on a downlink subframe of the aggregated carrier;

according to the feedback corresponding relation on the frequency band of each carrier, receiving feedback information of downlink data sent on a downlink subframe corresponding to the feedback corresponding relation on the frequency band of the carrier on an uplink subframe which can be used by the frequency band of the carrier; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

A terminal, comprising:

a downlink data receiving module, configured to receive downlink data on downlink subframes of each aggregated carrier respectively;

a feedback information generation module, configured to generate feedback information for downlink data received on each downlink subframe of each carrier respectively;

a feedback information sending module, configured to send, on an uplink subframe that is usable in a frequency band where each carrier is located, feedback information of downlink data received on a downlink subframe corresponding to the feedback correspondence, according to the feedback correspondence on the frequency band where each carrier is located; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

A network device, comprising:

a downlink data sending module, configured to send downlink data on a downlink subframe of the aggregated carrier;

a feedback information receiving module, configured to receive, on an uplink subframe that is usable in a frequency band where each carrier is located, feedback information of downlink data sent on a downlink subframe corresponding to the frequency band where the carrier is located according to a feedback correspondence on the frequency band where the carrier is located; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

The technical scheme provided by the embodiment of the invention does not use the existing downlink data feedback scheme, and adopts the feedback corresponding relation of the downlink subframe corresponding to each usable uplink subframe on the indication frequency band to determine the feedback information of the downlink data needing to be fed back on the current uplink subframe, so that the feedback information of the downlink data can be transmitted on the usable uplink subframe of the frequency band, and the performance of downlink data transmission is improved.

Drawings

Fig. 1 is a flow chart of a terminal side method provided by an embodiment of the invention;

fig. 2 is a flow chart of a network device side method according to an embodiment of the present invention;

fig. 3 is a schematic view of a first carrier aggregation frame structure according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a second carrier aggregation frame structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

The technical solution provided in the embodiments of the present invention does not use the existing downlink data feedback scheme, but sends/receives feedback information of downlink data transmitted on a downlink subframe corresponding to a frequency band in which a current uplink subframe is available, on an uplink subframe available for use in the frequency band in which each carrier is located, according to a feedback correspondence on the frequency band in which each carrier is located, where the feedback correspondence is used to indicate a downlink subframe corresponding to each available uplink subframe. The feedback information of the downlink data can be transmitted on the uplink subframe available in the frequency band, and the performance of downlink data transmission is improved.

The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a method for transmitting feedback information of downlink data at a terminal side according to an embodiment of the present invention, which is specifically implemented in a manner that:

and step 100, receiving downlink data on downlink subframes of each aggregated carrier respectively.

Step 110, generating feedback information for the downlink data received on each downlink subframe of each carrier.

Wherein the feedback information is correct/error (ACK/NACK) information.

Step 120, according to the feedback corresponding relationship on the frequency band of each carrier, sending feedback information of downlink data received on the downlink subframe corresponding to the feedback corresponding relationship on the uplink subframe available to the frequency band of each carrier, where the feedback corresponding relationship is used to indicate the downlink subframe corresponding to each uplink subframe available.

As described above, the terminal supports only a single-band transmission capability in uplink, so in an Inter-band CA scenario, an uplink subframe of the terminal needs to be allocated between different frequency bands, so as to ensure that the terminal only transmits uplink data on a carrier of one frequency band in one uplink subframe. Therefore, in the embodiment of the present invention, the uplink subframe available for the frequency band indicates that the uplink subframe is allocated to the frequency band.

As also described above, downlink carriers served by the same base station (or downlink carriers belonging to the same frequency band) are generally grouped into one group, and each group of downlink carriers corresponds to a specific uplink carrier, and is used for feeding back ACK/NACK information to the base station serving the group of downlink carriers through the PUCCH of the uplink carrier. Therefore, in the embodiment of the present invention, the carriers in steps 100 to 110 are downlink carriers, and in step 110, feedback information of downlink data received on a downlink subframe corresponding to the feedback correspondence is sent on an uplink subframe that can be used in a frequency band where each carrier is located, specifically through an uplink carrier corresponding to the carrier.

In the feedback correspondence relationship of the embodiment of the present invention, the number of downlink subframes corresponding to each usable uplink subframe should be as average as possible and correspond to each usable uplink subframe according to a time sequence. That is, it is ensured that the downlink subframes where downlink data feedback is required correspond to the uplink subframes available to the frequency band as uniformly as possible, and that the feedback delay of each subframe is minimum. To achieve this, there may be a variety of feedback correspondences, which the present invention is not exhaustive. The following description is given by way of example only of a preferred feedback correspondence.

In the preferred feedback correspondence, it is assumed that uplink subframes, which are available in a radio frame, of a frequency band in which each carrier is located are divided into at least one feedback group, and the number of downlink subframes, which are corresponding to each available uplink subframe (i.e., the uplink subframe available in the frequency band in which the carrier is located) indicated by the preferred feedback correspondence, is: the frequency band corresponds to the first a uplink subframes in each feedback group of a wireless frameEach downlink subframe, and the last b uplink subframes in each feedback group of a wireless frame respectively correspond toAnd one downlink subframe. In the embodiment of the invention, the front-back sequence between the subframes, namely the time sequence of the subframes, is embodied by the subframe numbers.

The sum of a and b is the number of uplink subframes in a feedback group, and the number of downlink subframes corresponding to a feedback group is equal toA feedback group packageAt least one group of usable uplink subframes with continuous subframe numbers and the number of downlink subframes corresponding to each feedback group

The number p of downlink subframes corresponding to one feedback group is the number of downlink subframes in a subframe set formed by a k '-1 subframe before an uplink subframe with the maximum subframe number in the previous feedback group and a k subframe before the uplink subframe with the maximum subframe number in the feedback group, wherein k and k' are greater than 3, the k 'subframe before the uplink subframe with the maximum subframe number in the previous feedback group is a downlink subframe and other downlink subframes do not exist between the k' subframe and the uplink subframe with the maximum subframe number, and the k subframe before the uplink subframe with the maximum subframe number in the feedback group is a downlink subframe and other downlink subframes do not exist between the k subframe and the uplink subframe with the maximum subframe number in the feedback group;

q is the number of usable uplink subframes in a feedback group;

N_ULthe number of usable uplink subframes, N, in a radio frame for the frequency band of each carrier_DLAnd the number of downlink subframes in a wireless frame is the frequency band of each carrier.

It should be noted that the downlink subframe described in the embodiment of the present invention further includes a downlink pilot timeslot in a special subframe of a TDD frame structure. Therefore, in the embodiment of the present invention, in the feedback correspondence, the special subframe of the TDD frame structure is also regarded as the downlink subframe.

Based on any of the above embodiments, the feedback correspondence indicates that one downlink subframe corresponds to a unique usable uplink subframe; and the feedback correspondence indicates that one usable uplink subframe corresponds to a downlink subframe before the interval of three subframes, for example, a downlink subframe with the subframe number of m, and a usable uplink subframe with the corresponding subframe number of more than m + 3; and the feedback corresponding relation indicates that the usable uplink subframe with the subframe number n corresponds to the downlink subframe with the subframe number m, indicates that the usable uplink subframe with the subframe number n 'corresponds to the downlink subframe with the subframe number m', and if m '> m, n' is more than or equal to n.

In the embodiment of the invention, the feedback corresponding relation on each frequency band is predetermined. The following illustrates the determination method of the feedback correspondence:

suppose a frequency band contains x groups of usable uplink subframes with consecutive subframe numbers in a radio frame. For the usable uplink subframes with consecutive subframe numbers in the ith group, wherein the subframe number of the uplink subframe with the largest subframe number is n, and the subframe number of the uplink subframe with the largest subframe number in the usable uplink subframes with consecutive subframe numbers in the previous group is n', then defining: the number of downlink subframes in a subframe set formed by the k '+ 1 th subframe before the uplink subframe with the subframe number of n' to the k th subframe before the uplink subframe with the subframe number of n is the number of downlink subframes corresponding to usable uplink subframes with continuous subframe numbers of the ith group. Wherein, k ' >3, the kth subframe before the uplink subframe with the subframe number of n ' is a downlink subframe, and no other downlink subframe exists between the kth subframe and the uplink subframe with the subframe number of n '; k' >3, the kth subframe before the uplink subframe with the subframe number of n is a downlink subframe, and no other downlink subframe exists between the kth subframe and the uplink subframe with the subframe number of n.

If the number p' of the downlink subframes corresponding to the usable uplink subframes with continuous subframe numbers of each group meets the requirementDetermining the correspondence of the first a uplink subframes in the usable uplink subframes with continuous subframe numbers of each groupOne downlink subframe and the next b uplink subframes respectively correspond toAnd one downlink subframe. Wherein a and b satisfy the following conditions:

if there is at least one group of continuous usable up sub-frame numberThen, the usable uplink sub-frames with consecutive numbers of the group of uplink sub-frames and the previous group of sub-frames are used as a group of uplink sub-frames, and whether the number of downlink sub-frames corresponding to the group of uplink sub-frames (the number of downlink sub-frames corresponding to the group of uplink sub-frames can be defined as above) is less than or not is determinedAnd the product of the number of the group of uplink subframes and the number of the previous group of subframes is smaller than the product of the number of the group of uplink subframes and if the product of the number of the group of uplink subframes and the number of the previous group of subframes is smaller than the product of the number of the group of uplink subframes and the number of the previous group of subframes, the usable uplink subframes with the number of the group of uplink subframes and the number of the previous group of subframes are continuously usedOne downlink subframe and the next b uplink subframes respectively correspond toAnd one downlink subframe.

After determining the number of downlink subframes corresponding to each usable uplink subframe, the method may specifically be to determine a corresponding relationship between the uplink subframe and the downlink subframe, so that the corresponding relationship satisfies the conditions of the timing relationship, that is: the feedback corresponding relation indicates that one downlink subframe corresponds to the only usable uplink subframe; and the feedback correspondence indicates that one usable uplink subframe corresponds to a downlink subframe before the interval of three subframes, for example, a downlink subframe with the subframe number of m, and a usable uplink subframe with the corresponding subframe number of more than m + 3; and the feedback corresponding relation indicates that the usable uplink subframe with the subframe number n corresponds to the downlink subframe with the subframe number m, indicates that the usable uplink subframe with the subframe number n 'corresponds to the downlink subframe with the subframe number m', and if m '> m, n' is more than or equal to n.

The feedback time sequence indicated by the feedback corresponding relation provided by the embodiment of the invention may be different from the feedback time sequence specified by the existing protocol, and the downlink data feedback can not be carried out by using the resources of the existing physical uplink control channel format1a/1b (PUCCHFurmat 1a/1 b).

In order to solve the problem that the existing PUCCH format1a/1b resource is unavailable, the terminal can determine the PUCCHformat1a/1b resource used for sending feedback information of downlink data according to the indication of a Physical Downlink Control Channel (PDCCH). Specifically, the PUCCHformat1a/1b resource is determined according to the indication of the ARI information field in the PDCCH. The terminal can also determine the PUCCH format1a/1b resource used for sending the feedback information of the downlink data according to the configuration of the high-level signaling. Specifically, the PUCCH format1a/1b resource used by the feedback information of the downlink data is determined by static/semi-static configuration of the higher layer signaling. Correspondingly, based on any of the above embodiments or a combination thereof, the terminal may send the feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence, by using the physical uplink control channel format1a/1b resource indicated by the physical downlink control channel transmitted on each carrier, on the uplink subframe that can be used by the frequency band where each carrier is located. The terminal may also send feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence, using a physical downlink control channel format1a/1b resource configured by a high-level signaling, on an uplink subframe that can be used in the frequency band where each carrier is located.

When downlink data feedback is performed according to the technical scheme provided by the embodiment of the invention, because an FDD carrier does not contain a DAI information domain in a physical downlink control channel/enhanced physical downlink control channel (PDCCH/EPDCCH) for scheduling downlink transmission, the feedback bit sequence of downlink data in an uplink subframe cannot be directly determined according to the existing scheme. To solve this problem, embodiments of the present invention provide a new feedback bit sequence determination method, which is not only applicable to FDD carriers.

The feedback bit sequence determination method provided by the embodiment of the invention comprises the following steps: and the terminal determines the feedback bit sequence of the downlink subframe corresponding to the usable uplink subframe according to the time sequence of the downlink subframe corresponding to the usable uplink subframe. Assuming that the subframe numbers of downlink subframes corresponding to a current uplink subframe (subframe number is n) are n-3, n-4, n-5 and n-6, if a corresponding uplink carrier is in a single codeword transmission mode, a terminal determines that the feedback bit sequence of each downlink subframe is a according to the time sequence of the downlink subframe corresponding to the current uplink subframe₀a₁a₂a₃Wherein a is₀Feedback information for downlink data transmitted on a downlink subframe numbered n-3, a₁Feedback information for downlink data transmitted on a downlink subframe numbered n-4, a₂Feedback information for downlink data transmitted on a downlink subframe numbered n-5, a₃Feedback information of downlink data transmitted on a downlink subframe with a subframe number of n-6; if the corresponding uplink carrier is in a double-code-word transmission mode, the terminal determines the feedback bit sequence of each downlink subframe as a according to the time sequence of the downlink subframe corresponding to the current uplink subframe₀a₁a₂a₃a₄a₅a₆a₇Wherein a is₀a₁Feedback information for downlink data transmitted on a downlink subframe numbered n-3, a₂a₃Feedback information for downlink data transmitted on a downlink subframe numbered n-4, a₄a₅Feedback information for downlink data transmitted on a downlink subframe numbered n-5, a₆a₇And the feedback information of the downlink data transmitted on the downlink subframe with the subframe number of n-6.

Another feedback bit sequence determination method provided by the embodiment of the inventionThe method comprises the following steps: and acquiring a downlink subframe feedback index in a scheduling signaling of a downlink subframe corresponding to the usable uplink subframe, and determining a feedback bit sequence of the downlink subframe corresponding to the usable uplink subframe according to the downlink subframe feedback index. Assuming that the subframe numbers of a downlink subframe corresponding to a current uplink subframe (the subframe number is n) are n-3 and n-4, a downlink subframe feedback index carried in a scheduling signaling of the downlink subframe with the subframe number of n-3 is 0, a downlink subframe feedback index carried in a scheduling signaling of the downlink subframe with the subframe number of n-4 is 1, if a corresponding uplink carrier is in a single codeword transmission mode, the feedback bit sequence in a feedback codebook corresponding to the current uplink subframe is a₀a₁Wherein a is₀Feedback information for downlink data transmitted on a downlink subframe numbered n-3, a₁Feedback information of downlink data transmitted on a downlink subframe with a subframe number of n-4; if the corresponding uplink carrier is in a double-codeword transmission mode, the feedback bit sequence in the feedback codebook corresponding to the current uplink subframe is a₀a₁a₂a₃Wherein a is₀a₁Feedback information for downlink data transmitted on a downlink subframe numbered n-3, a₂a₃And the feedback information of the downlink data transmitted on the downlink subframe with the subframe number of n-4.

Correspondingly, based on any of the above embodiments or a combination thereof, before sending the feedback information of the downlink data received on the downlink subframe corresponding to the frequency band in which each carrier is located on the usable uplink subframe, the terminal may respectively concatenate the feedback information of the downlink data received on the downlink subframe corresponding to each usable uplink subframe according to the feedback bit sequence of the downlink subframe corresponding to each usable uplink subframe. The feedback bit sequence may be determined according to a timing sequence of a downlink subframe corresponding to each usable uplink subframe, or may be determined according to a downlink subframe feedback index value in a scheduling signaling of a downlink subframe.

Fig. 2 shows a method for transmitting feedback information of downlink data at a network device side according to an embodiment of the present invention, which is specifically implemented as follows:

and step 200, sending downlink data on the downlink subframe of the aggregated carrier.

Step 210, according to the feedback corresponding relationship on the frequency band of each carrier, receiving feedback information of downlink data sent on a downlink subframe corresponding to the feedback corresponding relationship on a usable uplink subframe of the frequency band of the carrier; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

In the embodiment of the network device side, the same or similar technical features as those of the terminal side exist, and the description of the terminal side may be referred to.

For example, in the network device side method embodiment, the description of the number of downlink subframes and corresponding time sequence corresponding to each usable uplink subframe on the frequency band indicated by the feedback correspondence is the same as that in the terminal side embodiment, and is not repeated here.

The feedback timing indicated by the feedback corresponding relation provided by the embodiment of the invention may be different from the feedback timing specified by the existing protocol, and the downlink data feedback cannot be performed by using the existing resources of the PUCCH format1a/1 b.

To solve the problem that the existing PUCCH format1a/1b resource is not available, based on any of the embodiments or a combination thereof, before receiving the feedback information of the downlink data, the network device may indicate, through the PDCCH, the PUCCH format1a/1b resource used for sending the feedback information of the downlink data. Specifically, the network device indicates the PUCCH format1a/1b resource through the ARI information field of the PDCCH. Correspondingly, the network device may receive, on the uplink subframe that is usable in the frequency band where the carrier is located, the feedback information of the downlink data transmitted on the downlink subframe corresponding to the feedback correspondence relationship, using the physical uplink control channel format1a/1b resource indicated by the physical downlink control channel transmitted on the carrier.

In order to solve the problem that the existing PUCCH format1a/1b resource is unavailable, based on any one of the embodiments or a combination thereof, before receiving the feedback information of the downlink data, the network device may further configure, through a higher layer signaling, the PUCCH format1a/1b resource used for sending the feedback information of the downlink data. Specifically, the PUCCH format1a/1b resource is statically/semi-statically configured through higher layer signaling. Correspondingly, the network device may receive, on the uplink subframe that is usable in the frequency band where each carrier is located, the feedback information of the downlink data transmitted on the downlink subframe corresponding to the feedback correspondence, using the physical downlink control channel format1a/1b resource configured by the higher layer signaling.

When downlink data feedback is performed according to the technical scheme provided by the embodiment of the invention, because an FDD carrier does not contain a DAI information field in a PDCCH/EPDCCH for scheduling downlink transmission, a feedback bit sequence in a feedback codebook cannot be directly defined according to the existing scheme. To solve this problem, embodiments of the present invention provide a new feedback bit sequence determination method, which is not only applicable to FDD carriers.

Based on any of the above embodiments or a combination thereof, a feedback bit sequence determination method provided by an embodiment of the present invention is as follows: the network equipment determines a feedback bit sequence in a feedback codebook corresponding to the current uplink subframe according to the time sequence of a downlink subframe corresponding to the current uplink subframe; or, the network device sends a downlink subframe feedback index through a scheduling signaling of a downlink subframe corresponding to the current uplink subframe, so as to determine a feedback bit sequence in a feedback codebook corresponding to the current uplink subframe according to the downlink subframe feedback index. Correspondingly, after receiving the feedback information of the downlink data sent on the corresponding downlink subframe in the feedback correspondence, the network device may further respectively determine the feedback information of the downlink data sent on each downlink subframe corresponding to the usable uplink subframe according to the feedback bit sequence of the downlink subframe corresponding to the usable uplink subframe; the feedback bit sequence is determined according to the time sequence of the downlink subframe corresponding to each usable uplink subframe, or the feedback bit sequence is determined according to the downlink subframe feedback index value in the scheduling signaling of the downlink subframe.

The following further explains the technical solution provided by the embodiment of the present invention by taking a specific application scenario as an example.

When it is assumed that two TDD carriers (carrier 1 and carrier 2) with different configurations in frequency bands are aggregated to serve a terminal, carrier 1 uses TDD uplink/downlink configuration 6, and carrier 2 uses TDD uplink/downlink configuration 4. As shown in fig. 3, subframe 4 on carrier 1, subframe 7 and subframe 8 may transmit uplink data, and subframe 2 and subframe 3 on carrier 2 may transmit uplink data, configured by high-layer signaling.

In the embodiment of the present invention, the subframe with the subframe number n may be referred to as subframe n for short. For example, subframe 4 is a subframe with subframe number 4.

It should be noted that, in the uplink subframe, the TDD carrier is an uplink carrier, and in the downlink subframe, the TDD carrier is a downlink carrier.

For carrier 2, the usable uplink subframe is the same as that of the conventional uplink subframe, and thus the conventional downlink data feedback method can be used. The following description is only for the downlink feedback process of carrier 1:

on a carrier 1, one radio frame comprises 2 groups of available uplink subframes with continuous subframe numbers, the uplink subframe with the subframe number of 4 in the uplink subframe group with continuous subframe numbers corresponds to the subframe number of the first downlink subframe before 3 subframes to be 0, and the uplink subframe with the subframe number of 8 in the uplink subframe group with continuous subframe numbers corresponds to the subframe number of the first downlink subframe before 3 subframes to be 1.

The downlink subframes in the subframe set formed from the subframe number 2 in the previous radio frame to the subframe number 0 in the present radio frame include subframe 0, subframe 5, subframe 6, and subframe 9, and thus p =4 for the uplink subframe group with consecutive subframe numbers of the first subframe.

Similarly, for the uplink subframe group with consecutive second subframe number, p = 1.

For the uplink subframe group with consecutive second subframe numbers,therefore, it is not only easy to use And taking the uplink subframe group with continuous first subframe number and the uplink subframe group with continuous second subframe number as a feedback group, determining that a =2 and b =1, so that subframe 4 and subframe 7 correspond to 2 downlink subframes respectively, and subframe 8 corresponds to 1 downlink subframe.

Further, subframe 8 corresponds to subframe 1, subframe 7 corresponds to subframe 0 and subframe 9, and subframe 4 corresponds to subframe 5 and subframe 6.

Taking subframe 4 as the current uplink subframe as an example, according to the determined feedback correspondence, the terminal obtains the feedback information of the downlink data transmitted in carrier 1 and in subframe 5 and subframe 6 of the last radio frame, and sends the feedback information of the downlink data in the current uplink subframe through carrier 1.

For the carrier 1, the downlink feedback time sequence determined in the above manner is different from the downlink feedback time sequence corresponding to the TDD uplink/downlink configuration of the carrier 1 itself, so that the PUCCH format1a/1b resource used for downlink data feedback needs to be indicated in the following manner;

the first method is as follows: the PUCCH format1a/1b resources of carrier 1 and carrier 2 are indicated by an explicit mode for the terminal. Specifically, the method comprises the following steps:

the used PUCCH format1a/1b resource may be indicated by adding an ARI information field in the PDCCH; or,

and configuring the used PUCCH format1a/1b resources statically/semi-statically through higher layer signaling.

The second method comprises the following steps: the terminal is indicated by an explicit mode in the PUCCH format1a/1b resource of the carrier 1, and is still indicated by an implicit mode in the PUCCH format1a/1b resource of the carrier 2.

The display mode indication is specifically as follows: indicating a used PUCCH format1a/1b resource by adding an ARI information field in a PDCCH; or configuring the used PUCCH format1a/1b resources statically/semi-statically through higher layer signaling.

As shown in fig. 4, assuming that FDD carriers (carrier 1 and carrier 2) with different configurations on two frequency bands are aggregated to serve a terminal, a subframe 0 on the carrier 1 is configured through high-layer signaling, a subframe 3 and a subframe 6 can transmit uplink data, and a subframe 1, a subframe 2, a subframe 4, a subframe 5, a subframe 7, a subframe 8 and a subframe 9 on the carrier 2 can transmit uplink data.

It should be noted that carrier 1 further includes an uplink carrier and a downlink carrier, and carrier 2 further includes an uplink carrier and a downlink carrier.

The following describes how to perform downlink feedback by taking carrier 1 as an example:

on carrier 1, one radio frame includes 3 groups of continuous available uplink subframes, an uplink subframe numbered 0 in the first uplink subframe group corresponds to a first downlink subframe before 3 subframes and is a subframe 6 in the previous radio frame, an uplink subframe numbered 6 in the previous uplink subframe group corresponds to a first downlink subframe before 3 subframes and is a subframe 2 in the previous radio frame, so that for the first uplink subframe group, p = 4; for the second and third subframe groups, the same way can be found for p =3, p = 3;

since the uplink subframe groups numbered consecutively for the second and third subframes,exist ofThen determine a =1, b=2, so the first 1 uplink subframe (subframe 0) in this uplink subframe group carriesACK/NACK information of one downlink sub-frame, the last 2 uplink sub-frames (sub-frame 3 and sub-frame 6) carry continuous information on the downlink carrier wave of the frequency bandACK/NACK information of each downlink subframe.

Allocating feedback information of 3 continuous downlink subframes before subframe #3, namely subframe 0, subframe 1 and subframe 2, to the last uplink subframe #6 of the continuous uplink subframe group; then, 3 consecutive downlink subframes (subframe 7, subframe 8, and subframe 9 of the previous radio frame) are allocated to the uplink subframe #3 in the uplink subframe group, and 4 consecutive downlink subframes (subframe 3, subframe 4, subframe 5, and subframe 6 of the previous radio frame) are allocated to the uplink subframe 0 in the uplink subframe group.

For two aggregated FDD carriers, the downlink feedback time sequence determined in the above manner is different from the downlink feedback time sequence corresponding to the existing FDD carrier, and therefore, the pucchforme 1a/1b resource used for downlink data feedback needs to be indicated in an explicit manner.

The used PUCCH format1a/1b resource may be indicated by adding an ARI information field in the PDCCH;

the used PUCCH format1a/1b resources can be statically/semi-statically configured through higher layer signaling;

when the above method is used for feeding back downlink data, as an FDD carrier does not include a DAI information field in a PDCCH/EPDCCH for scheduling downlink transmission, a feedback bit sequence of a plurality of downlink subframes corresponding to one uplink subframe cannot be directly defined according to the existing scheme, which is solved by the following two methods;

the first method is as follows: defining a feedback bit order according to a subframe order contained within a feedback window

For example: for uplink subframe #6, the downlink subframes within the corresponding feedback window (i.e., the downlink subframe corresponding to uplink subframe 6) are subframe 0, subframe 1, and subframe 2. If the current carrier is in the single-codeword transmission mode, the feedback bit sequence corresponding to the uplink subframe 6 is a0a1a2, where a0a1a2a3 are the feedback bits of the downlink subframe 0, the downlink subframe 1, and the downlink subframe 2, respectively; if the current carrier is the transmission mode of the double code words, the feedback bit sequence corresponding to the uplink subframe #6 is a0a1a2a3a4a5, where a0a1 is the feedback bit of the downlink subframe #0, a2a3 is the feedback bit of the downlink subframe #1, and a4a5 is the feedback bit of the downlink subframe # 2;

the second method comprises the following steps: increasing DAI information field in PDCCH/EPDCCH scheduling downlink transmission

For example: for uplink subframe #6, the downlink subframes within the corresponding feedback window are subframe 0, subframe 1, and subframe 2. When all three subframes in the feedback window are scheduled, the DAI indication index number included in the PDCCH/EPDCCH of the scheduling subframe #0 is 0, the DAI indication index number included in the PDCCH/EPDCCH of the scheduling subframe 1 is 1, and the DAI indication index number included in the PDCCH/EPDCCH of the scheduling subframe 2 is 2. When only subframe 2 in the feedback window is scheduled, the index number of the DAI indication included in the PDCCH/EPDCCH of the scheduling subframe 2 is 0.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a terminal, a structure of which is shown in fig. 5, including:

a downlink data receiving module 501, configured to receive downlink data on downlink subframes of each aggregated carrier respectively;

a feedback information generating module 502, configured to generate feedback information for downlink data received on each downlink subframe of each carrier respectively;

a feedback information sending module 503, configured to send, according to the feedback correspondence on the frequency band where each carrier is located, feedback information of downlink data received on a downlink subframe corresponding to the feedback correspondence on the frequency band where each carrier is located, on an uplink subframe that can be used by the frequency band where each carrier is located; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

Preferably, the uplink subframe, which can be used in a radio frame, of the frequency band where each carrier is located is divided into at least one feedback group, and the number of the downlink subframes, which correspond to each available uplink subframe, on the frequency band indicated by the feedback correspondence relationship is:

the first a uplink sub-frames of the frequency band of each carrier in each feedback group of a wireless frame respectively correspond toEach downlink subframe, and the last b uplink subframes in each feedback group of a wireless frame respectively correspond toA downlink subframe;

the sum of a and b is the number of uplink subframes in a feedback group, and the number of downlink subframes corresponding to a feedback group is equal toOne feedback group comprises at least one group of usable uplink subframes with continuous subframe numbers, and the number of downlink subframes corresponding to each feedback group

q is the number of usable uplink subframes in a feedback group;

Preferably, the feedback correspondence indicates that one downlink subframe corresponds to a unique usable uplink subframe;

and the feedback corresponding relation indicates that one usable uplink subframe corresponds to a downlink subframe before three subframe intervals;

and the feedback corresponding relation indicates that the usable uplink subframe with the subframe number n corresponds to the downlink subframe with the subframe number m, indicates that the usable uplink subframe with the subframe number n 'corresponds to the downlink subframe with the subframe number m', and if m '> m, n' is more than or equal to n.

Preferably, the feedback information sending module 503 is specifically configured to:

on the usable up sub-frame of frequency band of each carrier, use the physical up control channel format1a/1b resource that the physical down control channel transmitted on each carrier points out, send the feedback information of the downlink data received on the corresponding down sub-frame in the said feedback corresponding relation; or,

and sending feedback information of the downlink data received on the downlink subframe corresponding to the feedback corresponding relation by using a physical downlink control channel format1a/1b resource configured by a high-level signaling on the uplink subframe which can be used by the frequency band of each carrier wave.

Preferably, before the feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence is sent on the uplink subframe that can be used by the frequency band of each carrier, the feedback information sending module 503 is further configured to:

respectively cascading the feedback information of the downlink data received on the downlink sub-frame corresponding to each usable uplink sub-frame according to the feedback bit sequence of the downlink sub-frame corresponding to each usable uplink sub-frame; the feedback bit sequence is determined according to the time sequence of the downlink subframe corresponding to each usable uplink subframe, or the feedback bit sequence is determined according to the downlink subframe feedback index value in the scheduling signaling of the downlink subframe.

Based on the same inventive concept as the method, an embodiment of the present invention further provides a network device, whose structure is shown in fig. 6, including:

a downlink data sending module 601, configured to send downlink data on a downlink subframe of an aggregated carrier;

a feedback information receiving module 602, configured to receive, on an uplink subframe that is usable in a frequency band where each carrier is located, feedback information of downlink data sent on a corresponding downlink subframe in a feedback correspondence, according to the feedback correspondence on the frequency band where the carrier is located; and the feedback corresponding relation is used for indicating the downlink subframe corresponding to each usable uplink subframe.

q is the number of usable uplink subframes in a feedback group;

Preferably, the feedback information receiving module 602 is specifically configured to:

receiving feedback information of downlink data sent on a downlink subframe corresponding to the feedback corresponding relation by using a physical uplink control channel format1a/1b resource indicated by a physical downlink control channel transmitted on the carrier on an uplink subframe which can be used by the frequency band of the carrier; or,

and receiving feedback information of downlink data sent on the downlink subframe corresponding to the feedback corresponding relation by using a physical downlink control channel format1a/1b resource configured by a high-level signaling on the uplink subframe which can be used by the frequency band of each carrier wave.

Preferably, after receiving the feedback information of the downlink data sent on the corresponding downlink subframe in the feedback correspondence, the feedback information receiving module 602 is further configured to:

respectively determining feedback information of downlink data sent on each downlink subframe corresponding to the usable uplink subframe according to the feedback bit sequence of the downlink subframe corresponding to the usable uplink subframe; the feedback bit sequence is determined according to the time sequence of the downlink subframe corresponding to each usable uplink subframe, or the feedback bit sequence is determined according to the downlink subframe feedback index value in the scheduling signaling of the downlink subframe.

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 transmitting feedback information of downlink data is characterized by comprising the following steps:

2. The method of claim 1, wherein the uplink subframes available in a radio frame of the frequency band in which each carrier is located are divided into at least one feedback group, and the number of downlink subframes corresponding to each available uplink subframe indicated by the feedback correspondence relationship is:

q is the number of usable uplink subframes in a feedback group;

3. The method according to claim 1 or 2, wherein the feedback correspondence indicates that one downlink subframe corresponds to a unique usable uplink subframe;

4. The method according to claim 1 or 2, wherein the sending feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence on the uplink subframe available for the frequency band of each carrier includes:

5. The method according to claim 1 or 2, wherein before sending the feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence on the uplink subframe that can be used by the frequency band of each carrier, the method further comprises:

respectively cascading the feedback information of the downlink data received on the downlink sub-frame corresponding to each usable uplink sub-frame according to the feedback bit sequence of the downlink sub-frame corresponding to each usable uplink sub-frame; the feedback bit sequence is determined according to the time sequence of the downlink subframe corresponding to the usable uplink subframe, or the feedback bit sequence is determined according to the feedback index value of the downlink subframe in the scheduling signaling of the downlink subframe.

6. A method for transmitting feedback information of downlink data is characterized by comprising the following steps:

transmitting downlink data on a downlink subframe of the aggregated carrier;

7. The method of claim 6, wherein the uplink subframes available in a radio frame of the frequency band in which each carrier is located are divided into at least one feedback group, and the number of downlink subframes corresponding to each available uplink subframe indicated by the feedback correspondence relationship is:

q is the number of usable uplink subframes in a feedback group;

N_ULthe number of usable uplink subframes, N, in a radio frame for the frequency band of each carrier_DLNumber of downlink sub-frames in a radio frame for the frequency band of each carrier。

8. The method according to claim 6 or 7, wherein the feedback correspondence indicates that one downlink subframe corresponds to only one usable uplink subframe;

9. The method according to claim 6 or 7, wherein receiving feedback information of downlink data sent on a downlink subframe corresponding to the feedback correspondence on an uplink subframe that can be used in the frequency band where the carrier is located includes:

10. The method according to claim 6 or 7, wherein after receiving the feedback information of the downlink data transmitted on the corresponding downlink subframe in the feedback correspondence, the method further comprises:

11. A terminal, comprising:

12. The terminal of claim 11, wherein the uplink subframes available in a radio frame of the frequency band in which each carrier is located are divided into at least one feedback group, and the number of the downlink subframes corresponding to each available uplink subframe indicated by the feedback correspondence relationship is:

wherein the sum of a and b is the number of uplink subframes in a feedback group, andthe number of downlink subframes corresponding to one feedback group is equal toOne feedback group comprises at least one group of usable uplink subframes with continuous subframe numbers, and the number of downlink subframes corresponding to each feedback group

q is the number of usable uplink subframes in a feedback group;

13. The terminal according to claim 11 or 12, wherein the feedback correspondence indicates that one downlink subframe corresponds to a unique usable uplink subframe;

14. The terminal according to claim 11 or 12, wherein the feedback information sending module is specifically configured to:

15. The terminal according to claim 11 or 12, wherein before sending, on the uplink subframe that can be used in the frequency band where each carrier is located, the feedback information of the downlink data received on the downlink subframe corresponding to the feedback correspondence relationship, the feedback information sending module is further configured to:

16. A network device, comprising:

17. The network device according to claim 16, wherein the uplink subframes available in a radio frame of the frequency band in which each carrier is located are divided into at least one feedback group, and the number of downlink subframes corresponding to each available uplink subframe indicated by the feedback correspondence relationship is:

q is the number of usable uplink subframes in a feedback group;

18. The network device according to claim 16 or 17, wherein the feedback correspondence indicates that one downlink subframe corresponds to a unique usable uplink subframe;

19. The network device according to claim 16 or 17, wherein the feedback information receiving module is specifically configured to:

20. The network device according to claim 16 or 17, wherein after receiving the feedback information of the downlink data sent on the corresponding downlink subframe in the feedback correspondence, the feedback information receiving module is further configured to: