WO2017171299A1 - Procédé et appareil pour le renvoi d'informations d'accusé de réception de harq - Google Patents

Procédé et appareil pour le renvoi d'informations d'accusé de réception de harq Download PDF

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Publication number
WO2017171299A1
WO2017171299A1 PCT/KR2017/003079 KR2017003079W WO2017171299A1 WO 2017171299 A1 WO2017171299 A1 WO 2017171299A1 KR 2017003079 W KR2017003079 W KR 2017003079W WO 2017171299 A1 WO2017171299 A1 WO 2017171299A1
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WIPO (PCT)
Prior art keywords
harq
uplink
ack
carrier
subframe
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PCT/KR2017/003079
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English (en)
Inventor
Yi Wang
Shichang Zhang
Yingyang Li
Original Assignee
Samsung Electronics Co., Ltd.
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Publication date
Priority claimed from CN201610298403.8A external-priority patent/CN107294665A/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to US16/089,925 priority Critical patent/US10790942B2/en
Publication of WO2017171299A1 publication Critical patent/WO2017171299A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present disclosure relates to radio communications technologies, more particularly to a method and an apparatus for feeding back HARQ-ACK information.
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • CoMP Coordinated Multi-Points
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet which is a human centered connectivity network where humans generate and consume information
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology”
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • IoT Internet technology services
  • IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
  • IT Information Technology
  • 5G communication systems to IoT networks.
  • technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas.
  • MTC Machine Type Communication
  • M2M Machine-to-Machine
  • Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
  • RAN Radio Access Network
  • FIG. 1 shows a frame structure of a TDD system.
  • Each radio frame is of 10ms length and is divided into two 5ms half-frames.
  • Each half-frame includes eight 0.5ms slots and three special fields, i.e., downlink pilot slot (DwPTS), guard period (GP) and uplink pilot slot (UpPTS).
  • DwPTS downlink pilot slot
  • GP guard period
  • UpPTS uplink pilot slot
  • the total length of the three special fields is 1ms.
  • the TDD system supports 7 kinds of uplink-downlink configurations, as shown in Table 1.
  • D denotes downlink subframe
  • U denotes uplink subframe
  • S denotes a special subframe including the above three special fields.
  • LTE-A LTE-Advanced
  • CC Component Carriers
  • CA Carrier Aggregation
  • Pcell Primary Cell
  • Scells Secondary Cells
  • Hybrid Automatic Repeat reQuest (HARQ) technique is utilized to ensure reliability of downlink data receiving.
  • the UE receives a DL-GRANT, wherein the DL-GRANT is carried by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH).
  • Physical Downlink Shared Channel (PDSCH) is received according to indication information in the DL-GRANT.
  • the UE For each Transmission Block (TB) received via PDSCH, or received Physical Downlink Control Channel indicating release of semi-persistent scheduling (hereinafter the above two are referred to as downlink HARQ transmission), the UE needs to feed back ACK (correct receiving) bit or NACK (incorrect receiving or lost) bit to the base station via corresponding uplink subframe, hereinafter referred to as HARQ-ACK bit. If the base station receives the NACK bit, the base station re-transmits the TB corresponding to the NACK or the PDCCH indicating the release of the SPS.
  • the LTE-A standard defines corresponding method for determining the number of HARQ-ACK bits to be fed back and values of the HARQ-ACK bits.
  • the number of HARQ-ACK bits to be fed back is determined according to the number of carriers configured for the UE and a transmission mode (transmission mode supporting up to one TB or transmission mode supporting up to two TBs) of each carrier. For each carrier configured for the UE, if the transmission mode is one TB, the carrier corresponds to one HARQ-ACK bit. If the transmission mode is two TBs, the carrier corresponds to two HARQ-ACK bits.
  • PUSCH Physical Uplink Shared Channel
  • the bits are arranged according to an ascending order of the indexes of the carriers, to form a HARQ-ACK bit sequence that the UE finally feeds back in uplink subframe n (the HARQ-ACK bit sequence refers to that before channel coding, the same applies hereinafter).
  • the number of HARQ-ACK bits to be fed back by the UE in an uplink subframe n is determined by an HARQ-ACK time-frequency bundling window, a Downlink Assignment Index (DL DAI) carried in UL Grant (UG) of subframe n, number of carriers configured for the UE, and the transmission mode configured for each carrier, in which:
  • the HARQ-ACK time-frequency bundling window is determined by a TDD uplink-downlink configuration corresponding to a HARQ-ACK timing relationship followed by the HARQ-ACK fed back of the UE, denoting all downlink subframes on one carrier whose HARQ-ACK is to be fed back in subframe n.
  • the indexes of the downlink subframes are denoted by n- k i , k i ⁇ K, wherein the dimension M of the set K is referred to as the size of the time-frequency bundling window.
  • the set K determined by the LTE standard with respect to the HARQ timing relationships corresponding to different TDD uplink-downlink configurations is as shown in Table 2.
  • UL DAI denotes a maximum number of downlink subframes actually have downlink HARQ transmission in the time-frequency bundling window configured for each carrier of the UE.
  • the HARQ-ACK bit sequence needs to be fed back by the UE is determined by a sum O UE of HARQ-ACK bits corresponding to all carriers. If O UE is not larger than 20, the HARQ-ACK bit of each carrier is arranged according to an ascending order of the carrier indexes to form the HARQ-ACK bit sequence to be fed back by the UE. Otherwise, if O UE is larger than 20, for all carriers whose transmission mode is two TBs, an "OR" calculation (i.e., spatial bundling) is performed to the two HARQ-ACK bits corresponding to two TBs of each subframe, to obtain one HARQ-ACK bit.
  • O UE is not larger than 20
  • an "OR" calculation i.e., spatial bundling
  • the HARQ-ACK bit corresponding to each subframe is remained unchanged.
  • the HARQ-ACK bit of each carrier of the UE is arranged according to the ascending order of the carrier indexes to generate the HARQ-ACK bit sequence to be fed back by the UE.
  • the HARQ-ACK bit sequence finally fed back by the UE may include a HARQ-ACK bit corresponding to a downlink subframe which has no downlink HARQ transmission.
  • the HARQ-ACK bit sequence fed back by the UE always includes an HARQ-ACK bit corresponding to that carrier.
  • the UE determines the number of downlink subframes having downlink HARQ transmission on each carrier according to Bc, but the value of Bc may be larger than the number of downlink subframes actually having downlink HARQ transmission in the time-frequency bundling window corresponding to the carrier.
  • Bc the number of downlink subframes actually having downlink HARQ transmission in the time-frequency bundling window corresponding to the carrier.
  • the UE supports at most 5 carriers. Therefore, the existence of the nonsense HARQ-ACK bit does not have much impact to the system performance.
  • the maximum number of carriers supported by the UE should be increased.
  • the number of carriers supported by the UE will be increased to 32, wherein carriers on the unlicensed band may be included.
  • the absolute value of non-scheduled downlink subframes may increase accordingly. Therefore, the impact brought out by the nonsense HARQ-ACK bit is enlarged. In this case, if the current HARQ-ACK feedback mechanism is still utilized, the efficiency for feeding back information will decrease and finally affect the downlink peak rate of the UE, which contradicts to the initial objective of increasing the number of carriers.
  • the Total DAI indicates a total number of scheduled PDSCHs in all subframes and on all carriers from the first subframe to a current subframe in the HARQ-ACK time-frequency bundling window.
  • the counter DAI indicates a total number of scheduled PDSCHs on all carriers before the current subframe in the HARQ-ACK bundling window and the scheduled PDSCHs on carriers from a carrier with minimum index to the carrier in the current subframe.
  • the total DAI indicates a total number of scheduled PDSCHs on all carriers in the current subframe
  • the counter DAI indicates a total number of scheduled PDSCHs on carriers from a carrier with minimum index to the carrier in the current subframe.
  • an LTE device may operate on both the licensed band and the unlicensed band at the same time, via a carrier aggregation or double connection manner.
  • An apparent difference between a licensed carrier and an unlicensed carrier is that, data transmission of the LTE device on the unlicensed band is based on listen before talk (LBT), i.e., the LTE device has to sense a busy/idle state of the unlicensed carrier. Only when the unlicensed carrier is idle, the LTE device is able to transmit on the carrier. Since the LTE device cannot accurately predict when the unlicensed carrier will be idle, the transmission of the LTE device on the unlicensed carrier is uncertain, i.e., it cannot be predicted that whether it can transmit in subframe n.
  • LBT listen before talk
  • uplink control signal can be transmitted on the unlicensed band. Since the transmission is based on LBT and the unlicensed band does not have a fixed uplink-downlink configuration, and the UE also cannot ensure that it can transmit uplink signal in an uplink subframe, when the uplink control signal is transmitted on the unlicensed carrier, the HARQ-ACK feedback cannot be transmitted according to the semi-statically configured HARQ-ACK timing. Therefore, how to effectively transmit uplink control signal on the unlicensed carrier is an urgent problem to be solved.
  • Embodiments of the present disclosure provide a method for feeding back HARQ-ACK information.
  • the method includes:
  • a time-frequency bundling window corresponding to an uplink subframe in a feedback window of a first uplink subframe for feeding back HARQ-ACK
  • a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH) scheduling downlink HARQ transmission obtaining a downlink assignment index (DL DAI) in a DL-assignment, and determining a mapping value of each DL DAI;
  • PDCCH physical downlink control channel
  • EPDCCH enhanced PDCCH
  • the first uplink subframe for feeding back the HARQ-ACK is determined according to indication information in received physical layer signaling, and/or the first uplink subframe for feeding back the HARQ-ACK is determined according to a reference carrier and an HARQ-ACK timing of a carrier on which PDSCH is received.
  • the feedback window of the first uplink subframe for feeding back the HARQ-ACK starts from the first uplink subframe, and the length of the feedback window is configurable.
  • the second uplink subframe is within the feedback window.
  • the time-frequency bundling window includes all downlink subframes whose HARQ-ACK need to be fed back in the first uplink subframe, and the HARQ-ACK of the downlink subframes are arranged according to a predefined rule.
  • the mapping the HARQ-ACK bits of each HARQ feedback unit to the corresponding bits of the feedback bit sequence according to the mapping value of the corresponding DL DAI includes: determining whether there is another second uplink subframe which belongs to another feedback window and overlaps with the second uplink subframe;
  • PDSCHs physical downlink shared channels
  • determining a number of first type HARQ-ACK bits according to a maximum number of PDSCHs can be scheduled in all downlink subframes of the time-frequency bundling window of a first uplink subframe corresponding to the another second uplink subframe in the another feedback window, and determining a number of a second type HARQ-ACK bits according to the number of PDSCHs actually being scheduled in all downlink subframes in the time-frequency bundling window of the first uplink subframe corresponding to the second uplink subframe of the feedback window, and determining the sequence of the two types of HARQ-ACK bits according to a predefined rule.
  • the number of PDSCHs actually being scheduled is determined according to a received total DAI and/or counter DAI; and/or,
  • the maximum number of PDSCHs can be scheduled is determined according to a number of configured carriers.
  • the mapping the HARQ-ACK bits of each HARQ feedback unit to the corresponding bits of the feedback bit sequence according to the mapping value of the corresponding DL DAI includes: determining whether there is another second uplink subframe which belongs to another feedback window and overlaps with the second uplink subframe;
  • determining a first type HARQ-ACK bits according to the PDSCHs actually being scheduled in all downlink subframes in the time-frequency bundling window of a first uplink subframe corresponding to the another second uplink subframe in the another feedback window determining a second type HARQ-ACK bits according to the PDSCHs actually being scheduled in all downlink subframes of the time-frequency bundling window of the first uplink subframe corresponding to the second uplink subframe of the feedback window, and determining a sequence of the two types of HARQ-ACK bits according to a predefined rule.
  • the number of PDSCHs actually being scheduled is determined according to at least the received total DAI and/or counter DAI.
  • the predefined rule includes: determining the sequence of the two types of HARQ-ACK bits according to a sequence of the first uplink subframes respectively corresponding to the two types of HARQ-ACK bits, wherein the HARQ-ACK bits corresponding to the first uplink subframe which is earlier in time are placed in the front, and the HARQ-ACK bits corresponding to the first uplink subframe which is latter in time are placed behind.
  • values of the total DAI and/or counter DAI are determined cumulatively in time-frequency bundling windows corresponding to all uplink subframes in the feedback window.
  • the determining the uplink carrier for feeding back the HARQ-ACK includes:
  • the uplink carrier merely responsible for feeding back the HARQ-ACK of an unlicensed carrier is a first uplink carrier, and the uplink carrier responsible for feeding back the HARQ-ACK of licensed carrier and/or unlicensed carrier is a second uplink carrier.
  • the process of determining the uplink carrier for feeding back the HARQ-ACK according to the channel busy/idle state further includes: if the channel is currently busy, an index of an uplink carrier for feeding back the HARQ-ACK corresponding to the current subframe is 1 less than that of the uplink carrier for feeding back the HARQ-ACK corresponding to a next subframe.
  • the number of a first type HARQ-ACK bits according to a maximum number of PDSCHs can be scheduled in all downlink subframes in the time-frequency bundling window corresponding to one of the first uplink carrier and the second uplink carrier which one has a minimum carrier index, and determining a number of second type HARQ-ACK bits according to the PDSCHs actually being scheduled in all downlink subframes in the time-frequency bundling window corresponding to one of the first uplink carrier and the second uplink carrier which has a maximum carrier index; the first type HARQ-ACK bits are arranged in the front and the second type HARQ-ACK bits are arranged behind the first type HARQ-ACK bits.
  • the number of PDSCHs actually being scheduled is determined according to a received total DAI and/or counter DAI; and/or
  • the maximum number of PDSCHs can be scheduled is determined according to a number of configured carriers.
  • Embodiments of the present disclosure further provide a method for feeding back channel state information (CSI), including:
  • uplink control information including at least CSI, determining a third uplink carrier on a licensed band for feeding back the uplink control information, and determining an uplink physical channel for carrying the uplink control information on the third uplink carrier;
  • periodic CSI of an unlicensed carrier is transmitted on a Pcell or a licensed carrier configured by a base station; if the uplink control information includes merely the periodic CSI, the uplink control information is transmitted on the primary cell or PUCCH on the licensed carrier configured by the base station; and/or if the uplink control information includes both periodic CSI and HARQ-ACK, and a physical uplink shared channel (PUSCH) is scheduled on at least one licensed carrier, a UE transmitting the periodic CSI on one of the at least one licensed carrier where the PUSCH is scheduled, and transmitting the HARQ-ACK on the Pcell or the PUCCH of the licensed carrier configured by the base station; and/or if the uplink control information includes both periodic CSI and HARQ-ACK, and no PUSCH is scheduled on a licensed carrier, the UE transmitting the HARQ-ACK and the CSI on the Pcell or the PUCCH on the licensed carrier configured by the base station.
  • PUSCH physical uplink shared channel
  • Embodiments of the present disclosure further provide an apparatus for feeding back HARQ-ACK information, including:
  • a receiving module configured to receive a DL-GRANT scheduling downlink HARQ transmission in a time-frequency bundling window corresponding to an uplink subframe for feeding back HARQ-ACK and/or time-frequency bundling windows corresponding to all uplink subframes in a feedback window of uplink subframes for feeding back HARQ-ACK, obtain a DL DAI and/or a total DAI and/or a counter DAI in the DL-GRANT, and determine a mapping value of each DAI; and
  • a feedback module configured to map HARQ-ACK bits of each HARQ feedback unit to corresponding bits of a feedback bit sequence according to the mapping value of the corresponding DAI.
  • efficiency for feeding back the HARQ-ACK can be increased and downlink peak rate of the UE can be ensured
  • FIG. 1 is a schematic diagram illustrating a frame structure of an existing TDD system.
  • FIG. 2 is a flowchart illustrating a method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 3 is a schematic diagram illustrating a method for feeding back HARQ-ACK information based on the HARQ-ACK timing of existing TDD-FDD carrier aggregation according to some embodiments of the present disclosure, in which it is assumed that the unlicensed carrier follows the HARQ-ACK timing of FDD according to some embodiments of the present disclosure.
  • FIG. 4 is a flowchart illustrating another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 5 is a flowchart illustrating yet another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram illustrating a method for feeding back HARQ-ACK information via an uplink carrier dynamically selected based on busy/idle state of the carriers according to some embodiments of the present disclosure.
  • FIG. 7 is a flowchart illustrating still another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic diagram illustrating a feedback window according to some embodiments of the present disclosure.
  • FIG. 9 is a schematic diagram illustrating a method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 10 is a schematic diagram illustrating another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 11 is a schematic diagram illustrating still another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 12 is a schematic diagram illustrating yet another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 13 is a schematic diagram illustrating an HARQ-ACK information receiving method according to some embodiments of the present disclosure.
  • FIG. 14 is a schematic diagram illustrating another HARQ-ACK information receiving method according to some embodiments of the present disclosure.
  • FIG. 15 is a schematic diagram illustrating a structure of an apparatus for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 16 is a schematic diagram illustrating another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 17 is a schematic diagram illustrating yet another method for feeding back HARQ-ACK information according to some embodiments of the present disclosure.
  • FIG. 18 is a schematic diagram illustrating a method for feeding back CSI information according to some embodiments of the present disclosure.
  • FIG. 19 is a schematic diagram illustrating another method for feeding back CSI information according to some embodiments of the present disclosure.
  • FIG. 20 is a schematic diagram illustrating yet another method for feeding back CSI information according to some embodiments of the present disclosure.
  • the timing of uplink subframe responsible for carrying ACK/NACK feedback of corresponding PDSCH is fixed.
  • the uplink carrier may be a primary uplink carrier (Pcell) or a primary secondary uplink carrier (pScell).
  • Pcell primary uplink carrier
  • pScell primary secondary uplink carrier
  • the system semi-statically configures the uplink-downlink configuration (as shown in Table 1) or dynamically indicates the uplink-downlink configuration on the basis of the semi-static configuration.
  • the UE is able to determine a unique value of k (as shown in Table 2) for the subframe n+k responsible for the HARQ-ACK feedback of the PDSCH of each downlink subframe according to the uplink-downlink configuration.
  • the uplink-downlink configuration of unlicensed carrier varies dynamically and is not limited to the existing 7 uplink-downlink configurations in TDD systems
  • the value of k of subframe n+k responsible for the HARQ-ACK feedback of the PDSCH of downlink subframe n cannot be determined according to the current TDD configuration and Table 2.
  • one method is: not dynamically change the value of k according to the uplink-downlink subframe situation of the unlicensed carrier, but determine the value of k according to the uplink-downlink configuration of a licensed carrier.
  • Another method is: dynamically indicate the value of k via physical layer signaling.
  • the indication may be explicit or implicit.
  • the value of k may be determined through (1) explicitly indicating the value of k in downlink DCI scheduling the PDSCH, or (2) explicitly indicating, in downlink common DCI which is used for indicating uplink-downlink transmission burst information, the value of k or the uplink-downlink subframe configuration information, so as to determine the value of k.
  • manner (1) or (2) may be applied.
  • Another problem of the LAA system relies in that, if an uplink subframe in which the base station expects the UE to transmit uplink control signal cannot be used for uplink transmission, e.g., in the subframe, channel is occupied by WiFi, then (1) the UE needs to try to transmit on another carrier in the subframe, or (2) try to transmit in another subframe on the same carrier, or (3) a combination of the above. In embodiments of the present disclosure, any one or any combination of the manners (1), (2) and (3) may be applied.
  • the HARQ-ACK information may be carried by PUCCH and/or PUSCH.
  • the HARQ-ACK of downlink carriers in the same PUCCH group is generally transmitted on one uplink carrier in the PUCCH group, but not transmitted on the uplink carrier of another PUCCH group, unless a predefined condition is met.
  • the predefined condition is CCA check failed.
  • the predefined condition is an indication for transmitting on another uplink carrier is received.
  • the PUCCH group may include the HARQ-ACK information of the downlink carriers of the PUCCH group, or include both the HARQ-ACK information of the downlink carriers of the PUCCH group and the HARQ-ACK information of another group.
  • the PUCCH group it is not restricted that there is an uplink carrier available for transmitting the PUCCH.
  • the PUSCH may carry uplink control information.
  • the carrier transmitting the PUCCH carrying the uplink control information may be configured semi-statically or predefined by standards, e.g., the uplink carrier configured as the pScell, or may be determined according to a predefined rule, e.g., an uplink carrier with a minimum Scellindex among those transmitting PUSCH, or an uplink carrier with a minimum Scellindex among those whose PUSCH is scheduled, or other rules.
  • the carrier transmitting the PUCCH may be configured semi-statically or predefined by standards, e.g. the uplink carrier configured as the pScell, or determined according to a predefined rule.
  • each of the above PUCCH groups is referred to as a PUCCH group in general.
  • the PUCCH group which is able to transmit the PUCCH is referred to as a first type PUCCH group
  • the PUCCH group which is only able to transmit PUSCH is referred to as a second type PUCCH group.
  • the two types of PUCCH groups may be independent or associated with each other.
  • the second type PUCCH group and the first type PUCCH group may have an intersection or not. When they have an intersection, the second type PUCCH group may be a subset of the first type PUCCH group.
  • a PUCCH group consists of unlicensed carriers and includes merely the PUSCH has no intersection with a PUCCH group consists of licensed carriers and includes PUCCH.
  • the embodiments of the present disclosure are also applicable for the cases that they have an intersection.
  • the second type PUCCH group may carry merely part of the uplink control information.
  • the remaining uplink control information may be carried by another PUCCH group.
  • the another PUCCH group may be the first type PUCCH group.
  • the another PUCCH group may be another second type PUCCH group.
  • the ACK/NACK information of the unlicensed carriers may be carried by the PUSCH in the PUCCH group, and periodic CSI information of the unlicensed carriers may be carried by PUSCH or PUCCH of another PUCCH group, e.g., carried by the Pcell or pScell transmitting PUCCH or PUSCH of a licensed carrier of another PUCCH group.
  • periodic CSI information of the unlicensed carriers may be carried by PUSCH or PUCCH of another PUCCH group, e.g., carried by the Pcell or pScell transmitting PUCCH or PUSCH of a licensed carrier of another PUCCH group.
  • the value of DAI is counted within the PUCCH group.
  • the base station configures 4 carriers for the UE, wherein CC1 ⁇ CC2 are licensed carriers and CC3 ⁇ CC4 are unlicensed carriers, CC3 and CC4 belong to a second type PUCCH group.
  • the values of DAI of the carriers CC1 and CC2 are counted cumulatively and the values of DAI of the carriers CC3 and CC4 are counted cumulatively.
  • the values of DAI of the two groups are counted individually.
  • the counting manner of the DAI is configured independently.
  • CC1 and CC2 may be configured with no DAI, a determination is made according to the number of configured carriers when the UE feeds back the HARQ-ACK, e.g., the LTE Rel-12 CA manner.
  • a total/counter DAI may be configured, e.g., the LTE Rel-13 CA manner.
  • the value of the DAI transmitted by the base station is cumulatively counted in multiple PUCCH groups.
  • the base station configures 4 carriers for the UE, wherein CC1 ⁇ CC2 are licensed carriers, and CC3 ⁇ CC4 are unlicensed carriers and belong to the second type PUCCH group.
  • the values of DAI of the four carriers CC1 ⁇ CC4 are counted cumulatively.
  • the uplink carriers for feeding back the uplink control information of the licensed carrier and the unlicensed carrier are different.
  • the HARQ-ACK information of the licensed carrier is transmitted on an uplink carrier of the licensed band
  • the HARQ-ACK information of the unlicensed carrier is transmitted on an uplink carrier of the unlicensed band or on an uplink carrier of the licensed band when a predefined condition is met.
  • an entity feeding back the HARQ-ACK is a UE
  • an entity receiving the HARQ-ACK is a base station.
  • the present disclosure is also applicable for other scenarios.
  • HARQ-ACK feedback is required for PDSCH and PDCCH indicating semi-persistent scheduling (SPS) service.
  • SPS semi-persistent scheduling
  • the present disclosure provides a method for feeding back HARQ-ACK information, as shown in FIG. 2.
  • the method includes the following.
  • a UE determines an uplink subframe n+k responsible for HARQ-ACK feedback corresponding to a PDSCH of a downlink subframe n.
  • the value of k may be determined according to HARQ-ACK timing of existing FDD-FDD and TDD-FDD carrier aggregation.
  • the first FDD corresponds to a reference carrier
  • the second FDD corresponds to an unlicensed carrier.
  • the TDD-FDD the TDD corresponds to a reference carrier and the FDD corresponds to an unlicensed carrier.
  • the meaning of the FDD corresponding to the unlicensed carrier is that, when determining the timing for the unlicensed band, the assumption of the FDD is applied.
  • the licensed carriers aggregated with the unlicensed carriers are all FDD carriers
  • the licensed carriers aggregated with the unlicensed carriers include both FDD carriers and TDD carriers or include merely TDD carriers
  • it is possible to determine the value of k of the uplink subframe n+k for feeding back the HARQ-ACK of the downlink subframe n of the unlicensed carriers based on a combination of the HARQ-ACK timing of the reference carrier (as shown in Table 2) determined according to the TDD uplink-downlink configuration and the HARQ-ACK timing of the unlicensed carrier based on the FDD assumption (e.g. k 4).
  • the reference carrier is Pcell or pScell.
  • the reference carrier is a licensed carrier.
  • the UE is configured with three carriers, wherein CC1 is a licensed carrier, configured as Pcell and is an FDD carrier, i.e., adopting frame structure 1 defined in TS 36.211, CC2 is a unlicensed carrier and is configured as Scell, i.e., adopting frame structure 3 defined in TS 36.211, CC3 is a unlicensed carrier and is configured as Scell, i.e., adopting frame structure 3 defined in TS 36.211.
  • the UE is configured with 3 carriers, wherein CC1 is a licensed carriers, configured as Pcell and is a TDD carrier, i.e., adopting frame structure 2 defined by TS 36.211, the uplink-downlink configuration is as shown by configuration 1 of Table 1, DSUUDDSUUD.
  • CC2 is an unlicensed carrier and is configured as Scell, i.e., adopting frame structure 3 defined by TS 36.211.
  • CC3 is an unlicensed carrier and is configured as Scell, i.e., adopting frame structure 3 defined by TS 36.211.
  • step 202 the UE transmits uplink control information in the uplink subframe n+k on the uplink carrier indicated by the base station.
  • the uplink control information includes at least the HARQ-ACK information.
  • the uplink carrier indicated by the base station is the Pcell or an unlicensed carrier configured for transmitting the PUCCH.
  • the uplink carrier indicated by the base station is the Pcell or an unlicensed carrier determined according to a predefined rule for feeding back the uplink control information.
  • indication information for indicating the uplink carrier by the base station is included in DL assignment DCI scheduling the PDSCH, e.g., 1 bit.
  • new bit(s) may be added in the DL assignment DCI scheduling the PDSCH.
  • existing bit(s) in the DL assignment DCI scheduling the PDSCH may be re-defined, e.g., TPC bits, at least one combination of the bits may be used for indicating the carrier, e.g., whether the transmission is on the Pcell/pScell, or is on the unlicensed carrier.
  • the re-definition of the existing bit(s) may be configured by the base station. For example, the base station may dynamically indicate which carrier is responsible for the transmission.
  • TPC bits may be used for indicating the carrier to transmit ACK/NACK and the corresponding resources on that carrier.
  • One combination of the TPC bits may be used for indicating that there is no carrier fallback.
  • the indication information is included in the common DCI.
  • the UE is configured with 3 carriers, CC1 is a licensed carrier and is Pcell, CC2/CC3 are unlicensed carriers and CC2 is pScell.
  • CC1 is a licensed carrier and is Pcell
  • CC2/CC3 are unlicensed carriers
  • CC2 is pScell.
  • the uplink control information of CC1 is merely fed back on CC1
  • the uplink control information of CC2/CC3 is fed back on CC2.
  • the indication information of the base station is 1 bit, indicating that whether the HARQ-ACK information is fed back on the Pcell (CC1) or the pScell (CC2).
  • the uplink carrier indicated by the base station is not restricted to the Pcell.
  • the base station may semi-statically configure two uplink carriers, e.g., CC2 and CC3.
  • the base station indicates that the HARQ-ACK is fed back on which carrier via physical layer signaling.
  • the base station may semi-statically configure a fallback uplink carrier corresponding to a second type PUCCH group.
  • the base station dynamically indicates via physical layer signaling whether the HARQ-ACK is fed back on the fallback carrier or the corresponding uplink carrier of the second type PUCCH group.
  • the base station configures 4 carriers for the UE, wherein carriers CC1 and CC2 are licensed carriers, CC1 is Pcell, CC3 and CC4 are unlicensed carriers, CC3/CC4 belong to a second type PUCCH group, CC2 is a fallback uplink carrier for the second type PUCCH group.
  • the base station is able to dynamically indicate whether the UE should transmit the HARQ-ACK on CC2 or CC3/CC4.
  • the UE determines, according to the HARQ-ACK feedback timing determined based on the reference carrier and the related art, bit length and bit sequence of the HARQ-ACK feedback. Or, the UE may determine the bit length and bit sequence of the HARQ-ACK feedback according to the method provided by embodiment 3.
  • the UE determines the bit length of the HARQ-ACK feedback according to the HARQ-ACK feedback timing determined based on the reference carrier, suppose that the DAI transmitted by the base station is counted individually for different PUCCH groups, when carriers of different PUCCH groups have an intersection, e.g., the second type PUCCH group is a subset of the first type PUCCH group, the total/counter DAI of all carriers in the second type PUCCH group are counted cumulatively, and the total/counter DAI of carriers within the same first type PUCCH group but not included in the second type PUCCH group are counted cumulatively.
  • the two types of DAI are counted independently.
  • the UE when transmitting the uplink control information on the carrier indicated by the base station, determines an uplink transmission power according to power control parameters of the carrier.
  • the UE when transmitting the uplink control information on the carrier indicated by the base station, the UE needs to determine positions of the resources for transmitting the uplink control information on the carrier.
  • the UE is configured with 3 carriers, CC1 is a licensed carrier and is Pcell, CC2/CC3 are unlicensed carriers and belong to a second type PUCCH group.
  • the uplink control information of the CC1 is transmitted on merely CC1. If PUSCH is transmitted on CC2, the uplink control information of CC2/CC3 is fed back on CC2; otherwise, the uplink control information of CC1/CC2/CC3 is fed back on CC1.
  • the UE determines, according to the bit length of the uplink control information to be fed back on CC1, a PUCCH format for feeding back the uplink control information on CC1 and transmission resources for the corresponding PUCCH format. For example, if the carrier indicated by the base station is a carrier of the second type PUCCH group, the UE feeds back the HARQ-ACK of CC1 on CC1 and feeds back the HARQ-ACK of CC2 and CC3 on CC2 on which PUSCH is transmitted.
  • the PUCCH on CC1 is of PUCCH format 1a/1b and the PUCCH resources are determined based on CCEs of the PDCCH on CC1.
  • the UE feeds back the HARQ-ACK of CC1, CC2 and CC3 on CC1 adopting the PUCCH format 3, the PUCCH resources are indicated by ARI in the DL assignment of CC2/CC3.
  • the manner that the base station informs the UE on which carrier the HARQ-ACK is to be fed back has the following advantages: the base station is able to determine, according to the overhead of the uplink control information on the licensed carrier, whether to let the UE to transmit on the licensed carrier such as the Pcell to feed back the HARQ-ACK of the unlicensed carrier. For another example, the base station is able to determine, according to a service situation or CCA situation of the unlicensed carrier, whether to schedule downlink transmission on the unlicensed carrier in the subframe in which HARQ-ACK may be fed back, so as to determine whether to let the UE to transmit on the licensed carrier. For example, if the base station determines to schedule the downlink transmission on the unlicensed carrier in a corresponding HARQ-ACK subframe, the base station may indicate the UE to feed back the HARQ-ACK on the Pcell in the corresponding subframe.
  • UE 1 is configured with 3 carriers.
  • CC1 is a licensed carrier, configured as PCell and is a TDD carrier, the uplink-downlink configuration 1 is adopted.
  • CC2/CC3 are unlicensed carriers,
  • CC2 is a pScell.
  • the base station transmits PDSCH for UE 1 in downlink subframes 0, 4, 5, 6 and 9 of CC1. Then UE 1 feeds back ACK/NACK in uplink subframes 7 and 8 of the same frame and uplink subframes 2, 2, 3 of the next frame.
  • the base station does not seize the channel in downlink subframes 0 ⁇ 3 of CC2, passes the CCA check in subframe 4 and occupies the channel for downlink transmission till subframe 8, performs a CCA check again and occupies the channel from subframe 9 to subframe 2 of the next frame.
  • the base station transmits the PDSCH for UE 1.
  • the UE performs uplink transmission in uplink subframes 2 and 3.
  • the base station does not seize the channel in downlink subframes 0 ⁇ 3 on CC3, passes the CCA check in subframe 4 and occupies the channel for downlink transmission till subframe 6, performs a CCA check again and occupies the channel from subframe 9 to subframe 2 of a next frame.
  • the base station transmits PDSCH for UE 1. It can be seen that, if the HARQ-ACK timing of CC1 is applied for CC2/CC3, the HARQ-ACK for the PDSCH transmitted in subframe 4 of CC2 and CC3 should be fed back in subframe 8. However, subframe 8 of CC2 is a downlink subframe and cannot transmit the HARQ-ACK. Therefore, the base station may inform UE 1 to feed back the HARQ-ACK of CC1, CC2 and CC3 in the subframe 8 on CC1.
  • the base station may inform UE 1 to feed back the HARQ-ACK of CC2 and CC3 in the subframe 2 of the next frame on CC2. It should be noted that, CC2 and CC3 do not have fixed uplink-downlink configuration. The base station may determine the uplink-downlink configuration according to service amount and busy/idle situation of the channel. In this example, CC2 has a large amount of downlink services.
  • the base station may configure less uplink subframes and more downlink subframes for CC2, so as to transmit more downlink services on CC2.
  • the HARQ-ACK feedback may be dynamically allocated to the Pcell for transmission.
  • the base station wants to ensure that the HARQ-ACK for a data packet transmitted in downlink subframe 4 on CC3 can be fed back in time.
  • the time cannot be ensured if the HARQ-ACK is transmitted on CC2, e.g., UE 1 cannot pass the CCA check if the channel is occupied by WiFi in subframe 8. Therefore, the base station may dynamically schedule UE 1 to transmit the HARQ-ACK on the Pcell.
  • the present disclosure provides a method for feeding back HARQ-ACK information.
  • the method includes the following.
  • a UE determines an uplink subframe n+k for feeding back HARQ-ACK corresponding to a PDSCH in downlink subframe n according to time information dynamically indicated by a base station.
  • step 402 the UE transmits uplink control information in the uplink subframe n+k on an uplink carrier indicated by the base station.
  • the uplink subframe for transmitting the HARQ-ACK determined by the UE is not predefined or determined based on a combination of the configured HARQ-ACK timing of a reference carrier and the HARQ-ACK timing of the unlicensed carrier, but is determined according to physical layer signaling transmitted by the base station.
  • the physical layer signaling is DL DCI of DL assignment or common DCI.
  • the physical layer signaling is the TPC bits in the DL DCI of the DL assignment, for indicating the uplink subframe for feeding back the HARQ-ACK.
  • the TPC bits in the Dl DCI are not used for power control of the PUCCH and also not used for indicating resources (ARI) of the PUCCH.
  • the TPC bits may be used for indicating the time information for feeding back the HARQ-ACK.
  • the TPC bits may be used for indicating, e.g., resource of aperiodic SRS.
  • the base station may indicate the uplink carrier according to the method provided by embodiments of the present disclosure or the related art.
  • the present disclosure provides a method for feeding back HARQ-ACK information, as shown in FIG. 5.
  • the method includes the following.
  • a UE determines an uplink subframe n+k for feeding back HARQ-ACK corresponding to a PDSCH in a downlink subframe n.
  • the UE may determine the uplink subframe n+k according to the method provided by step 201 of embodiment 1 or the method provided by step 401 in embodiment 2.
  • the UE determines uplink carrier information for the uplink control information including at least the HARQ-ACK information transmitted in uplink subframe n+k.
  • the uplink carrier information indicates on which uplink carrier the uplink control information containing at least the HARQ-ACK information is transmitted.
  • the uplink carrier includes at least a first uplink carrier and a second uplink carrier.
  • the first uplink carrier is an unlicensed carrier.
  • the first uplink carrier is an uplink carrier available for transmitting PUCCH in a PUCCH group.
  • the first uplink carrier is an uplink carrier determined according to a predefined rule and available for transmitting PUSCH containing UCI in a second type PUCCH group.
  • the second uplink carrier is a licensed carrier.
  • the second uplink carrier is a Pcell.
  • the second uplink carrier is the Pcell and is a licensed carrier.
  • the second uplink carrier is predefined, e.g., predefined to be the Pcell in standards.
  • the second uplink carrier is an uplink carrier available for transmitting PUCCH in a PUCCH group.
  • the second uplink carrier is an uplink carrier available for transmitting UCI in the first type PUCCH group.
  • the second uplink carrier is semi-statically configured by the base station, e.g., the base station may configure an uplink carrier on the licensed band for each second type PUCCH group.
  • the uplink carrier on the licensed band is available for transmitting PUCCH and the PUCCH carries the HARQ-ACK information of the carriers in the corresponding second type PUCCH group.
  • the HARQ-ACK information of the licensed carrier is transmitted on the Pcell/Scell of the first type PUCCH group where it belongs to.
  • the UE may perform a CCA check on the first uplink carrier before the uplink subframe n+k, if the CCA check is passed, the UE determines to transmit the HARQ-ACK on the first uplink carrier; otherwise, the UE transmits the HARQ-ACK on the second carrier.
  • the description herein does not consider the situation that the base station transmits a UL grant but the UE fails to detect the UL grant. However, in the case that the UE fails to detect the UL grant, the UE certainly cannot transmit the corresponding PUSCH. In this case, if there is no corresponding PUSCH transmission, the UE transmits the HARQ-ACK on the second carrier.
  • the UE may determine whether to transmit the HARQ-ACK on the first or second carrier according to the information indicating the uplink carrier for transmitting the uplink control information transmitted by the base station.
  • the indication information may be transmitted according to the method provided by embodiment 1 or 2.
  • the UE may determine whether the HARQ-ACK is fed back on the first or the second uplink carrier according to a total number of bits of the uplink control information can be fed back on the second uplink carrier. For example, suppose that the total number of bits of the HARQ-ACK of the downlink carriers of the PUCCH group corresponding to the second uplink carrier is PUCCH format X, and the sum of the number of bits of the HARQ-ACK should have been fed back on the first uplink carrier and the number of bits of the HARQ-ACK of the downlink carriers of the PUCCH group corresponding to the second uplink carrier is PUCCH format Y.
  • the UE may transmit on the second carrier to transmit the HARQ-ACK when it cannot be transmitted on the first carrier. If format X and format Y are different, the UE can fed back the HARQ-ACK on merely the first carrier or give up the feedback of the corresponding HARQ-ACK.
  • PUCCH format X and format Y are same, but the number of PRBs, e.g., 4 PRBs allocated by the base station for the PUCCH format X, is insufficient for carrying the sum of the number of bits of the HARQ-ACK which should have been fed back on the first uplink carrier and the number of bits of the HARQ-ACK of the downlink carriers of the PUCCH group corresponding to the second uplink carrier, e.g., 8 PRBs, the UE is merely able to feed back the HARQ-ACK on the first carrier or give up the feedback of the corresponding HARQ-ACK.
  • the number of PRBs e.g., 4 PRBs allocated by the base station for the PUCCH format X
  • the UE determines the uplink carrier for transmitting the uplink control information, and further determines the resources of the uplink carrier for transmitting the uplink control information.
  • the resources may be determined according to one or more of the following manners.
  • the PUCCH resources may be indicated by the TPC in the DL assignment of downlink carriers in the second type PUCCH group that the first uplink carrier belongs to (ARI).
  • the TPC in the DL assignment scheduling the downlink carrier Pcell merely indicates the power control information but does not indicate PUCCH resource information, i.e., not ARI.
  • the UE transmits, on the second uplink carrier, the HARQ-ACK of the downlink carrier Pcell in the first type PUCCH group and the HARQ-ACK of the downlink carriers of the second type PUCCH group that the first uplink carrier belongs to the utilized PUCCH resources are indicated by the TPC in the DL assignment of the downlink carriers of the second type PUCCH group that the first uplink carrier belongs to (ARI).
  • the TPC in the DL assignment of the downlink carriers in the first type PUCCH group that the second uplink carrier belongs to may indicate the PUCCH resources when merely the HARQ-ACK of the downlink carriers of the first type PUCCH group that the second uplink carrier belongs to is fed back, whereas the TPC in the DL assignment of the downlink carriers in the second type PUCCH group that the first uplink carrier belongs to indicates the PUCCH resources when the HARQ-ACK of the downlink carriers in the first type PUCCH group that the second uplink carrier belongs to and the HARQ-ACK of the downlink carriers of the second type PUCCH group that the first uplink carrier belongs to are fed back on the second uplink carrier.
  • the PUCCH resources may be indicated by the TPC in the DL assignment of the downlink carriers in the first type PUCCH group that the second uplink carrier belongs to (ARI).
  • the TPC in the DL assignment of the downlink carriers in the first type PUCCH group that the second uplink carrier belongs to is able to indicate both the PUCCH resources when merely the HARQ-ACK of the downlink carriers in the first type PUCCH group that the second uplink carrier is fed back, and the PUCCH resources when the HARQ-ACK of the downlink carriers of the first type PUCCH group that the second uplink carrier belongs to and the HARQ-ACK of the downlink carriers in the second type PUCCH group that the first uplink carrier belongs to are fed back.
  • the TPC in the DL assignment of the downlink carriers in the second type PUCCH group that the first uplink carrier belongs to may be used for indicating other information, e.g., indicating time information for feeding back the HARQ-ACK as mentioned in other embodiments, or indicating carrier information, or indicating information about aperiodic SRS, etc.
  • the PUCCH resources may be indicated by the TPC in the DL assignment of the downlink carriers in the second type PUCCH group that the first uplink carrier belongs to and the TPC in the DL assignment of the downlink carriers in the first type PUCCH group that the second uplink carrier belongs to (ARI).
  • the ARI information of the two kinds of TPC are same.
  • the PUCCH format is determined according to the number of bits of the uplink control information can be transmitted, and the resources may be indicated according to the PUCCH format and the TPC in the DL assignment of the downlink carriers of the second type PUCCH group that the first uplink carrier belongs to and/or the TPC in the DL assignment of downlink carriers of the first type PUCCH group that the second uplink carrier belongs to.
  • the resources for transmitting the uplink control information on the second uplink carrier may be determined according to the method provided by embodiment 1 or according to the related art.
  • step 503 according to the uplink carrier transmitting the uplink control information including at least the HARQ-ACK information, the HARQ-ACK bits are determined and are transmitted on the uplink carrier.
  • the transmitted HARQ-ACK information includes merely the HARQ-ACK information corresponding to the PDSCH of the downlink carriers in the PUCCH group that the first uplink carrier belongs to. If the HARQ-ACK information is transmitted on the second uplink carrier, the transmitted HARQ-ACK information includes both the HARQ-ACK information corresponding to the PDSCH of the downlink carriers of the PUCCH group where the first uplink carrier belongs to and the HARQ-ACK information corresponding to the PDSCH of the downlink carriers of the PUCCH group that the second uplink carrier belongs to, and so on.
  • the UE sorts the HARQ-ACK bits of the PDSCH of the downlink carriers of the PUCCH group that the first uplink carrier belongs to and the HARQ-ACK bits of the PDSCH of the downlink carriers of the PUCCH group that the second uplink carrier belongs to according to a predefined order. For example, it is possible to sort according to carrier indexes of the first uplink carrier and the second uplink carrier. For example, the HARQ-ACK corresponding to an uplink carrier with a small Scellindex is placed in the front, and the HARQ-ACK corresponding to an uplink carrier with a large Scellindex is placed behind.
  • the UE may use the following manner 1 or 2.
  • Manner 1 when determining the HARQ-ACK bits of the carrier group placed in the front, the UE determines the number of the HARQ-ACK bits according to a maximum number of bits can be fed back, i.e., the same as the mechanism in LTE Release 12, which determines the number of bits according to the number of configured carriers and information indicated by UL DAI/DL DAI, but not according to the number of PDSCHs (such as total DAI) actually transmitted by the base station.
  • the base station configures that the number of HARQ-ACK bits of the carrier group placed in the front is determined according to the number of configured carriers, i.e., the HARQ-ACK transmission manner of CA in Rel-12.
  • the UE determines the number of bits according to the number of PDSCHs actually transmitted (such as total DAI). For example, the HARQ-ACK bits of the PUCCH group that the second uplink carrier belongs to are placed in the most front, suppose that it is a FDD system, the PUCCH group includes 2 carriers, each carrier corresponds to 2 HARQ-ACK bits. Thus, no matter how many carriers that the base station schedules, the UE feeds back 4 bits. If the UE detects the PDSCH and the detection is correct, the UE feeds back an ACK.
  • the UE feeds back an NACK.
  • This manner has an advantage that, if the UE fails to detect the PDSCH in the PUCCH group that the second uplink carrier belongs to but does not aware of this, it does not affect the UE when arranging the HARQ-ACK bits of the PUCCH group that the first uplink carrier belongs to, which avoids misunderstanding of the base station and the UE about the bit length and bit arrangement of the HARQ-ACK.
  • the number of configured carriers refers to the number of carriers configured in one PUCCH group.
  • UE 1 is configured with 5 carriers, wherein CC1 is a licensed carrier and is a Pcell, CC2 is a licensed carrier and belongs to the same PUCCH group with CC1. These two carriers are both FDD carriers, and the transmission mode (TM) of each of them is to support up to two transmission blocks.
  • CC1 is the second uplink carrier.
  • CC3 ⁇ CC5 are unlicensed carriers and belong to the same PUCCH group.
  • the transmission mode (TM) of each of them is to support up to 2 transmission blocks.
  • CC3 is a pScell and is the first uplink carrier.
  • the base station transmits total DAIs. The total DAIs within different PUCCH groups are independent each other.
  • UE 1 receives the PDSCH on CC1, CC3 and CC4 in subframe 0, UE 1 determines that HARQ-ACK information needs to be fed back in subframe 4. Thus, before subframe 4, UE 1 performs a CCA check on CC3.
  • UE 1 feeds back the HARA-ACK of CC3 and CC4 on CC3, the number of HARQ-ACK bits is 4; and feeds back the HARQ-ACK of CC1 on CC1, the number of HARQ-ACK bits is 2.
  • the CCA check on CC3 fails, the feedback for the PDSCH of CC1, CC3 and CC4 are transmitted on CC1.
  • the UE needs to arrange the HARQ-ACK bits of CC1 and CC2 in the front and then the HARQ-ACK bits of CC3 ⁇ CC5.
  • the UE feeds back 4+4 bits, wherein the former 4 bits are the HARQ-ACK bits of CC1 and CC2, the latter 4 bits are HARQ-ACK bits of CC3 and CC4.
  • UE 1 correctly receives the total DAI of CC1 and is able to determine that there is merely one PDSCH in the second type PUCCH group, UE 1 still needs to determine the number of bits to be fed back according to the number of carriers CC1+CC2, wherein the ACK/NACK of CC1 is generated according to a CRC check result, and CC2 corresponds to NACK.
  • Manner 2 if the UE determines in step 502 to transmit the uplink control information containing the HARQ-ACK on the second uplink carrier, the HARQ-ACK bits of all carrier groups is determined according the maximum number of bits can be fed back, i.e., the same as the mechanism in LTE Release 12, which determines the number of bits according to the number of configured carriers and/or information indicated by UL DAI/DL DAI, but not according to the number of PDSCHs actually transmitted by the base station (such as total DAI). However, once the UE determines to feed back on the first uplink carrier, the number of bits is determined according to the number of PDSCHs (such as total DAI) actually transmitted by the base station.
  • the UE assumes that the total DAI and/or counter DAI transmitted by the base station are counted individually in each PUCCH group.
  • the number of configured carriers refers to the number of carriers configured in one PUCCH group.
  • step 503 if the HARQ-ACK is transmitted on the first uplink carrier, the number of bits is determined according to the number of PDSCHs (e.g., total DAI) actually transmitted by the base station according to current TDD system. If the HARQ-ACK is transmitted on the second uplink carrier, the HARQ-ACK of the second type PUCCH group is determined according to the maximum number of bits can be fed back according to the current TDD system.
  • the number of bits is determined according to the number of PDSCHs (e.g., total DAI) actually transmitted by the base station according to current TDD system.
  • the HARQ-ACK is transmitted on the second uplink carrier, the HARQ-ACK of the second type PUCCH group is determined according to the maximum number of bits can be fed back according to the current TDD system.
  • the uplink carrier feeding back the HARQ-ACK corresponding to the first uplink carrier may be the first uplink carrier or the second uplink carrier, e.g., if the determination is made based on the indication of the base station or a CCA check result of the UE as described above, the HARQ-ACK feedback mode of the UE is configured to be determined according to the maximum number of PDSCHs can be transmitted by the base station, i.e., the HARQ-ACK feedback manner of carrier aggregation in LE Release-12. As such, no matter that the UE feeds back the HARQ-ACK on the first or the second carrier, the number of HARQ-ACK bits is always determined according to the maximum number of PDSCHs can be transmitted by the base station.
  • the present disclosure provides a method for feeding back HARQ-ACK information. As shown in FIG. 7, the method includes the following.
  • a UE determines a first uplink subframe n+k responsible for HARQ-ACK feedback of PDSCH(s) of a downlink subframe n, and determines an uplink control information feedback window starting from the first uplink subframe.
  • the UE may determine the uplink subframe n+k according to the method as described in step 201 of embodiment 1 or the method described in step 401 of embodiment 2.
  • the uplink control information feedback window may be semi-statically configured by the base station. It is a time window starting from the first uplink frame and having a length of N.
  • the length N of the feedback window may be 1, i.e., the UE has merely one opportunity to attempt to transmit the uplink control information.
  • the length N of the feedback window may be an integer larger than 1.
  • the UE may transmit the uplink control information in a first idle uplink subframe in the feedback window.
  • the feedback windows have the same length, as shown in FIG. 8(a). If the subframe 4 or subframe 5 is the first uplink subframe, the length of the feedback window is 4.
  • the UE may transmit at least uplink control information corresponding subframe 4 in subframes 4 ⁇ 7 or transmit at least uplink control information corresponding subframe 5 in subframes 5 ⁇ 8. It should be noted that, since the length of uplink/downlink burst on the unlicensed carrier is variable, it is possible that there is no available uplink subframe within the feedback window, e.g., it has been switched to downlink subframes.
  • the UE is able to determine that the subframes in the feedback window cannot be used for uplink transmission based on explicit signaling indication, e.g., at least indication of ending of uplink burst indicated by the base station via common DCI, or other information indicating the uplink/downlink burst.
  • explicit signaling indication e.g., at least indication of ending of uplink burst indicated by the base station via common DCI, or other information indicating the uplink/downlink burst.
  • the UE is able determine whether subframes within the feedback window can be used for uplink transmission via blind detection, e.g., CCA check.
  • blind detection e.g., CCA check.
  • the UE may transmit at least the uplink control information corresponding to subframe 4 in subframes 4 ⁇ 7.
  • subframe 5 is the first subframe, although the configured length of the feedback window is 4, since subframe 8 is a downlink subframe, the subframes actually available for the UE is subframes 5 ⁇ 7. It can be seen that, the defined feedback window determines a maximum delay of the HARQ-ACK fed back by the UE.
  • the uplink control information feedback window may be dynamically configured by the base station.
  • the start point is still the first uplink subframe.
  • the length of the feedback window may be dynamically indicated by the base station, e.g. via DL assignment scheduling PDSCH or common DCI, or via other dedicated DCI.
  • step 702 the UE determines a position of a subframe in which uplink control information containing at least HARQ-ACK information can be transmitted within the uplink control information feedback window.
  • the subframe for transmitting the uplink control information must be within the feedback window.
  • the feedback window starts from the first uplink subframe n+k determined in step 701, then follows a second uplink subframe, a third uplink subframe, until the end of the feedback window.
  • the UE may perform a CCA check before the first uplink subframe. If the CCA check succeeds, the UE determines to transmit HARQ-ACK in the first uplink subframe. Otherwise, the UE performs a CCA check before the second uplink subframe. If the CCA check succeeds, the UE determines to transmit HARQ-ACK in the second uplink subframe. The process proceeds until the last uplink subframe in the feedback window. If the CCA check is not successful until the last uplink subframe, the UE gives up the transmission of the uplink control information, or attempts to transmit the uplink control information on another carrier, which is not restricted in the present disclosure.
  • the UE determines the HARQ-ACK bits to be transmitted according to the position of the subframe in which the uplink control information containing at least the HARQ-ACK information is transmitted, and transmits the uplink control information containing at least the HARQ-ACK information in the subframe.
  • the transmitted HARQ-ACK information includes merely the HARQ-ACK information corresponding to the PDSCH(s) of the downlink carriers corresponding to the first uplink subframe. If the HARQ-ACK information is transmitted in the second uplink subframe, the transmitted HARQ-ACK information includes both the HARQ-ACK information corresponding to the PDSCH(s) of the downlink carriers corresponding to the first uplink subframe and the HARQ-ACK information corresponding to the PDSCH(s) of the downlink carriers corresponding to the second uplink carrier, and so on.
  • the PDSCH(s) of the downlink carriers corresponding to the uplink subframe X may be the PDSCHs on all downlink carriers in all downlink subframes in the time-frequency bundling window corresponding to the uplink subframe X.
  • the length of the time-frequency bundling window may be 1, i.e., one uplink subframe corresponds to merely one downlink subframe.
  • the length of the time-frequency bundling window may be determined according to conventional TDD uplink-downlink configuration (Table 1, Table 2).
  • the length of the time-frequency bundling window may also be determined according to a newly-defined uplink-downlink configuration.
  • the time-frequency bundling window may also be determined according to an HARQ-ACK feedback time dynamically indicated by the base station, e.g., the base station may indicate via DL assignment that the HARQ-ACK corresponding to the downlink subframe n is expected to be fed back in the uplink subframe n+k, thus it can be determined how many downlink subframes correspond to the uplink subframe n+k.
  • the UE sorts the HARQ-ACK of the PDSCH(s) of the downlink carriers corresponding to the first uplink subframe, and/or sorts the HARQ-ACK of the PDSCH(s) of downlink carriers corresponding to the first uplink subframe and the HARQ-ACK of PDSCH(s) of downlink carriers corresponding to the second uplink subframe, and so on, and/or sorts the HARQ-ACK of PDSCH(s) of downlink carriers corresponding to the first uplink carrier until the HARQ-ACK of PDSCH(s) of downlink carriers corresponding to the last uplink subframe in the feedback window.
  • the UE sorts the HARQ-ACK bits of PDSCHs of downlink carriers corresponding to different uplink subframes according to the sequence of the uplink subframes. For example, when sorting the HARQ-ACK of the PDSCH(s) of downlink carriers corresponding to the first uplink subframe and that of the second uplink subframe, the HARQ-ACK of the PDSCH(s) of downlink carriers corresponding to the first uplink subframe is arranged in the front, and the HARQ-ACK of the PDSCH(s) of downlink carriers corresponding to the second uplink subframe is placed behind.
  • the UE arranges the HARQ-ACK bits the following manner 1 or manner 2 may be adopted.
  • the UE assumes that a total DAI and/or counter DAI transmitted by the base station are counted individually in the downlink subframes within respective time-frequency bundling window corresponding to the respective uplink subframe X. For example, as shown in FIG. 9, if the first uplink subframe is respectively subframe 4, 5, 6, and 7, the length of the time-frequency windows respectively corresponding to the first uplink subframes are all 1, the corresponding downlink subframe is respectively 0, 1, 2, and 3. Thus, the total DAI and counter DAI in the DL assignment in each of these downlink subframes is counted individually. For facilitating the description, FIG. 9 merely shows the total DAI, the same applies to the counter DAI.
  • the HARQ-ACK bits includes the HARQ-ACK bits respectively corresponding to uplink subframes X 1 , X 2 ,... and X n .
  • the number of HARQ-ACK bits corresponding to the uplink subframe X n is determined according to the number of PDSCH(s) actually transmitted (e.g. total DAI), whereas the number of HARQ-ACK bits corresponding to the uplink subframes X 1 , X 2 ,... and X n -1 should be determined according to the maximum number of bits can be fed back, i.e.
  • the number of bits is determined according to the number of configured carriers and/or information indicated in UL DAI/DL DAI, but not according to the number of PDSCH(s) actually transmitted by the base station (e.g., total DAI).
  • the HARQ-ACK bits having been transmitted will not be transmitted in a subsequent uplink subframe.
  • the number of configured carriers refers to the number of carriers configured in one PUCCH group.
  • a downlink burst includes subframes 0 ⁇ 3, an uplink burst includes subframes 4 ⁇ 7, and a next downlink burst including subframes 8 ⁇ 10.
  • UE 1 is configured with 4 CCs
  • CC0 is a licensed carrier and is configured as a Pcell
  • CC1 ⁇ CC3 are unlicensed carriers in the same PUCCH group
  • CC1 is a pScell for feeding back the HARQ-ACK of CC1 ⁇ CC3
  • the description is provided merely with respect to CC1 ⁇ CC3 but not to CC0.
  • the feedback may be performed according to a conventional method.
  • the transmission modes of CC1 ⁇ CC3 are all to support up to 2 transmission blocks.
  • the base station transmits PDSCH for UE 1 on CC1 ⁇ CC3.
  • the base station transmits PDSCH for UE 1 on CC1.
  • the base station transmits PDSCH for UE 1 on CC1 and CC3.
  • the first uplink subframe corresponds to downlink subframe 0 is subframe 4, the feedback window includes subframes 4 ⁇ 7.
  • the first uplink subframe corresponds downlink subframe 1 is subframe 5, and the feedback window includes subframes 5 ⁇ 8.
  • the first uplink subframe corresponds downlink subframe 3 is subframe 7, and the feedback window includes subframes 7 ⁇ 10.
  • the effective feedback windows respectively include subframes 4 ⁇ 7, subframes 5 ⁇ 7 and subframe 7.
  • UE 1 transmits 6 HARQ-ACK bits for downlink subframe 0 in uplink subframe 4.
  • UE 1 If a CCA check performed by UE 1 before uplink subframe 4 is failed, but the CCA check in uplink subframe 5 succeeds, UE 1 transmits 6 HARQ-ACK bits for downlink subframe 0 and transmits 2 HARQ-ACK bits for downlink subframe 1 in uplink subframe 5, a total of 8 bits.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 in uplink subframe 6, a total of 8 bits.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 in uplink subframe 6, a total of 8 bits.
  • UE 1 does not detect the DL DCI in downlink subframe 2
  • UE 1 still needs to generate 6 HARQ-ACK bits for the 3 carriers, and then arranges the 4 HARQ-ACK bits of subframe 3, so as to avoid that the dislocation of the HARQ-ACK bits of subframe 3 due to UE 1 failing to detect the PDSCH transmitted by the base station in subframe 2.
  • UE 1 since UE 1 has transmitted the HARQ-ACK bits of downlink subframes 0 and 1 in uplink subframe 6, UE 1 does not transmit the HARQ-ACK bits of downlink subframes 0 and 1 again when transmitting HARQ-ACK bits in uplink subframe 7.
  • UE 1 transmits in uplink subframe 7, 6 HARQ-ACK bits of downlink subframe 0, 6 HARQ-ACK bits of downlink subframe 1, 6 HARQ-ACK bits of downlink subframe 2, and 4 HARQ-ACK bits of downlink subframe 3, a total of 22 bits.
  • Manner 2 in some embodiments, the UE assumes that the values of total DAI and/or counter DAI transmitted by the base station are determined cumulatively for downlink subframes in all time-frequency bundling windows corresponding to all uplink subframes in the uplink control information feedback window.
  • a new time-frequency bundling window is defined. It starts from the first subframe in the time-frequency bundling window corresponding to the first uplink subframe in the feedback window, and ends at the last subframe in the time-frequency bundling window corresponding to the last uplink subframe in the feedback window.
  • the UE When receiving the total DAI and/or counter DAI, the UE assumes that the total DAI and/or counter DAI indicates a cumulative number of PDSCHs transmitted by the base station within all time-frequency windows from the first downlink subframe of the first time-frequency bundling window determined by the base station to the subframe in which the UE receives the total DAI and/or counter DAI. In some embodiments, the UE may regard that the value of the total DAI and/or counter DAI is determined cumulatively from the first downlink frame in which the total DAI and/or counter DAI is received to the current downlink subframe in which the UE receives the total DAI and/or counter DAI in all time-frequency bundling windows within a certain time period such as one UL burst.
  • the time-frequency bundling windows respectively correspond to first uplink subframes 4, 5, 6 and 7 are all 1, the corresponding downlink subframes are respectively 0, 1, 2 and 3.
  • the values of the total DAI and counter DAI in the DL assignment in these downlink subframes are determined cumulatively in subframes 0 ⁇ 3.
  • FIG. 11 merely shows the total DAI. It is similar for the counter DAI.
  • the UE determines the number of HARQ-ACK bits and arranges the HARQ-ACK bits according to the number of PDSCHs actually transmitted by the base station, e.g., according to the total DAI and counter DAI.
  • the UE when feeding back the HARQ-ACK, the UE feeds back the corresponding HARQ-ACK bits in the first subframe in the feedback window. If the UE does not feed back the HARQ-ACK bits in the first subframe successfully, the UE attempts to feed back the HARQ-ACK bits in the second subframe. At this time, the HARQ-ACK bits include both the HARQ-ACK that the UE fails to feed back in the first subframe and the HARQ-ACK bits corresponding to the second subframe. If the UE successfully feeds back the HARQ-ACK bits in the first subframe, the UE has two manners to feed back the HARQ-ACK bits in the second subframe.
  • the UE feeds back in the second subframe both the HARQ-ACK bits corresponding to the first subframe and the HARQ-ACK bits corresponding to the second subframe.
  • the UE feeds back merely the HARQ-ACK bits corresponding to the second subframe.
  • the first manner is able to avoid the impact of incorrect determination about the feedback situation of the first subframe to the receiving of the HARQ-ACK of the second subframe of the base station.
  • the second manner helps to effectively reduce the overhead of the HARQ-ACK feedback.
  • the UE is able to know from which downlink subframe that the total DAI and the counter DAI transmitted by the base station are counted. For example, the UE may make a determination through obtaining indication information of uplink/downlink burst. Accordingly, it is required that the base station also determines the first subframe for counting the DAI according to the indication information of the uplink/downlink burst when transmitting the total DAI and counter DAI.
  • the UE may not know from which downlink subframe the total DAI and counter DAI transmitted by the base station are counted.
  • the UE merely needs to arrange the HARQ-ACK bits according to the received total DAI and counter DAI. Accordingly, it is not restricted that the base station must determine the first subframe for counting the DAI according to a certain rule when transmitting the total DAI and counter DAI.
  • the base station may make a determination by itself or according to a predefined rule.
  • UE 1 is configured with 4 CCs, wherein CC0 is a licensed carrier and is a Pcell, CC1 ⁇ CC3 are unlicensed carriers in the same PUCCH group, CC1 is a pScell for feeding back the HARQ-ACK of CC1 ⁇ CC3, and belongs to a PUCCH group different from CC0.
  • CC0 the feedback may be performed according to a conventional method.
  • the transmission modes of CC1 ⁇ CC3 are all to support up to 2 transmission blocks.
  • the base station transmits PDSCH for UE 1 on CC1 ⁇ CC3.
  • the base station transmits PDSCH for UE 1 on CC1.
  • the base station transmits PDSCH for UE 1 on CC1 and CC3.
  • the first uplink subframe corresponds to downlink subframe 0 is subframe 4, the feedback window includes subframes 4 ⁇ 7.
  • the first uplink subframe corresponds downlink subframe 1 is subframe 5, and the feedback window includes subframes 5 ⁇ 8.
  • the first uplink subframe corresponds downlink subframe 3 is subframe 7, and the feedback window includes subframes 7 ⁇ 10.
  • the effective feedback windows respectively include subframes 4 ⁇ 7, subframes 5 ⁇ 7 and subframe 7.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 in uplink subframe 4.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 in uplink subframe 5, a total of 8 bits.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 in uplink subframe 6, a total of 8 bits.
  • UE 1 transmits 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 in uplink subframe 6, a total of 8 bits.
  • UE 1 does not detect the DL DCI in downlink subframe 2
  • UE 1 also fails to detect the PDSCH in downlink subframe 3.
  • UE 1 cannot determine whether the miss-detection happens in downlink subframe 2 or downlink subframe 3. But this does not affect the bit length and bit sequence of the HARQ-ACK.
  • UE 1 since UE 1 has transmitted the HARQ-ACK bits of downlink subframes 0 and 1 in uplink subframe 6, UE 1 does not transmit the HARQ-ACK bits of downlink subframes 0 and 1 again when transmitting HARQ-ACK bits in uplink subframe 7.
  • UE 1 transmits in uplink subframe 7, 6 HARQ-ACK bits of downlink subframe 0, 2 HARQ-ACK bits of downlink subframe 1, and 4 HARQ-ACK bits of downlink subframe 3, a total of 12 bits.
  • this embodiment describes merely one PUCCH group.
  • there may multiple PUCCH groups e.g., one PUCCH group including at least a licensed carrier, and another PUCCH group including merely unlicensed carriers.
  • the description is provided with respect to the PUCCH group including merely unlicensed carriers.
  • the PUCCH group including at least a licensed carrier the implementation is not restricted in the present disclosure, e.g. uplink control signal may be fed back according to a conventional method, or according to other methods.
  • the above shows embodiments for determining the number of bits in the FDD-FDD scenario.
  • the embodiments of the present disclosure are also applicable for the TDD-FDD scenario and the idea is the same.
  • the FDD operations need to be mapped to the TDD operations.
  • the number of bits is determined according to the number of PDSCHs actually transmitted by the base station (e.g. total DAI) according to the conventional TDD system.
  • the number of bits may be determined according to the maximum number of bits can be fed back in the TDD system.
  • the length of the time-frequency bundling window of one uplink subframe is larger than 1, and it is possible that the lengths of time-frequency bundling windows of different uplink subframes are different.
  • the base station needs to determine the value of the total DAI and counter DAI according to the number of PDSCHs can be transmitted in all downlink subframes of all time-frequency bundling windows corresponding to the uplink subframes from the first uplink frame to the current uplink subframe in the feedback window.
  • downlink subframes 0 and 1 form the HARQ-ACK time-frequency bundling window of uplink subframe 5
  • the length is 2.
  • Downlink subframe 3 is the HARQ-ACK time-frequency bundling window of uplink subframe 7, the length is 1.
  • the uplink control information includes merely the HARQ-ACK.
  • the present disclosure is also applicable for the situation that the uplink control information includes HARQ-ACK and/CSI.
  • This embodiment is applicable for transmitting uplink control information on a predefined uplink carrier, e.g. pScell, and pScell is an unlicensed carrier.
  • a predefined uplink carrier e.g. pScell
  • pScell is an unlicensed carrier.
  • This embodiment may be combined with embodiment 3, i.e., it is determined according to the method of embodiment 3 that the transmission is implemented on one of the multiple uplink carriers, and it is determined according to this embodiment the transmission is implemented in one of the multiple uplink subframes of the uplink carrier.
  • the sequence for determining the carrier and the subframe is not restricted.
  • This embodiment describes from a base station side, corresponding to embodiment 3.
  • the present disclosure provides a method for receiving HARQ-ACK information, as shown in FIG. 13.
  • the method includes the following.
  • a base station determines an uplink subframe n+k responsible for HARQ-ACK feedback of PDSCH(s) of a downlink subframe n.
  • the base station may determine the above uplink subframe according to the HARQ-ACK feedback timing preconfigured for the UE, or the HARQ-ACK timing dynamically indicated to the UE.
  • the base station detects, on multiple predefined uplink carriers from a first uplink carrier, uplink control information containing at least HARQ-ACK information, and determines the carrier for receiving the uplink control information.
  • the predefined uplink carriers may be defined in standards or configured by the base station.
  • the base station may determine whether the UE transmits the uplink control information containing at least the HARQ-ACK information on a carrier through blind detection, e.g., detecting reference signal, or CRC check, or correlation detection method. Or, the base station may determine whether the UE transmits the uplink control information containing at least the HARQ-ACK information on a corresponding carrier through detecting an indication transmitted by the UE indicating whether the UE has transmitted the corresponding uplink control information. For example, if the UE needs to transmit PUSCH and corresponding uplink control information, but the LBT detection of the UE is failed, the UE may report, e.g., on the Pcell, to the base station that there is no transmission on a corresponding carrier. Therefore, the base station can determine whether the UE has transmitted the uplink control information containing at least the HARQ-ACK information through detecting the information reported by the UE.
  • blind detection e.g., detecting reference signal, or CRC check, or correlation detection method.
  • the base station
  • the base station determines the length and bit sequence of the uplink control information containing at least the HARQ-ACK information to be received according to information of the carrier carrying the uplink control information containing at least the HARQ-ACK information.
  • the base station assumes that the transmitted HARQ-ACK information includes merely the HARQ-ACK information corresponding to the PDSCH(s) of downlink carriers in the PUCCH group corresponding to the first uplink carrier if the UE transmits the HARQ-ACK information on the first uplink carrier, and assumes that the transmitted HARQ-ACK information includes both the HARQ-ACK information of the PDSCH(s) of downlink carriers in the PUCCH group corresponding to the first uplink carrier and the HARQ-ACK information corresponding to the PDSCH(s) of downlink carriers in the PUCCH group of the second uplink carrier if the UE transmits the HARQ-ACK information on the second uplink carrier, and so on.
  • the base station assumes that the UE determines the sequence of the HARQ-ACK bits of the PDSCH(s) of the downlink carriers in the PUCCH group of the first uplink carrier and the HARQ-ACK bits of the PDSCH(s) of the downlink carriers in the PUCCH group of the second uplink carrier according to a predefined order.
  • the PUCCH group that the second uplink carrier belongs to include a Pcell, thus the HARQ-ACK bits corresponding to the downlink carriers in this PUCCH group are placed in the front, and the HARQ-ACK bits of the PDSCH(s) of the downlink carriers in the PUCCH group that the first uplink carrier belongs to are placed behind.
  • the base station assumes that the UE determines the number of HARQ-ACK bits of the PUCCH group whose HARQ-ACK bits are placed in the front according to maximum number of bits can be fed back, i.e., the same as the mechanism in LTE Release 12, in which the number of bits is determined according to number of configured carriers and/or information indicated in UL DAI/DL DAI, but not according to the number of PDSCH(s) actually transmitted by the base station (e.g. total DAI).
  • the number of bits is determined according to the number of PDSCH(s) actually transmitted by the base station (e.g. total DAI).
  • the base station assumes that if the uplink control information containing the HARQ-ACK is received on the second uplink carrier, the number of HARQ-ACK bits of all PUCCH groups is determined according to the maximum number of bits can be fed back, i.e., the same as the mechanism in LTE Release 12, in which the number of bits is determined according to the number of configured carriers and/or information indicated in UL DAI/DL DAI, but not according to the number of PDSCH(s) actually transmitted by the base station (total DAI).
  • the base station assumes that if the uplink control information containing the HARQ-ACK is received on the first uplink carrier, the number of the HARQ-ACK bits is determined according to the number of PDSCH(s) actually transmitted by the base station (e.g. total DAI).
  • This embodiment describes from the base station side and is corresponding to embodiment 4.
  • the present disclosure provides a method for receiving HARQ-ACK information, as shown in FIG. 14.
  • the method includes the following.
  • a base station determines a first uplink subframe n+k for the HARQ-ACK feedback of PDSCH(s) of a downlink subframe n, and determines an uplink control information feedback window starting from the first uplink subframe.
  • the base station may determine the first uplink subframe and the feedback window according to HARQ-ACK feedback time information and/or feedback window information preconfigured for the UE or according to the HARQ-ACK feedback time information and/or feedback window information dynamically indicated to the UE.
  • the base station detects uplink control information containing at least HARQ-ACK information in the uplink control information feedback window from the first uplink subframe, and determines the subframe for receiving the uplink control information.
  • the base station may determine whether the UE transmits the uplink control information containing at least the HARQ-ACK information in a corresponding subframe through blind detection, e.g., detecting reference signal, or CRC check, or correlation detection method. Or, the base station may determine whether the UE transmits the uplink control information containing at least the HARQ-ACK information in a corresponding subframe through detecting an indication transmitted by the UE indicating whether the UE has transmitted the corresponding uplink control information.
  • blind detection e.g., detecting reference signal, or CRC check, or correlation detection method.
  • the base station may determine whether the UE transmits the uplink control information containing at least the HARQ-ACK information in a corresponding subframe through detecting an indication transmitted by the UE indicating whether the UE has transmitted the corresponding uplink control information.
  • the base station determines the bit length and bit sequence of the uplink control information containing at least the HARQ-ACK information needs to be received according to the subframe in which the uplink control information containing at least the HARQ-ACK information is received.
  • the base station assumes that the UE arranges the HARQ-ACK bits of the PDSCHs of downlink carriers corresponding to different uplink subframes according to the sequence of the uplink subframes.
  • the base station assumes that, if the uplink control information containing at least the HARQ-ACK information is detected in an uplink subframe X1 in the feedback window, the uplink control information detected in a following uplink subframe X2 does not include the HARQ-ACK information transmitted by the UE in the uplink subframe X1.
  • the base station determines the values of the total DAI and/or counter DAI in the downlink subframes of the time-frequency bundling window corresponding to respective uplink subframe X individually.
  • the base station assumes that when the UE feeds back HARQ-ACK bits in uplink subframe X, the HARQ-ACK bits includes the HARQ-ACK bits corresponding to uplink subframes X 1 , X 2 ,...and X n , thus the number of HARQ-ACK bits corresponding to the uplink subframe X n is determined according to the number of PDSCH(s) actually transmitted (e.g.
  • the number of HARQ-ACK bits corresponding to the uplink subframes X 1 , X 2 ,... and X n -1 is determined according to the maximum number of bits can be fed back. If the UE successfully transmits the HARQ-ACK bits corresponding to a downlink subframe, the HARQ-ACK bits are not transmitted in the subsequent uplink subframe.
  • the base station determines the values of the total DAI and counter DAI cumulatively in downlink subframes in all time-frequency bundling windows corresponding to all uplink subframes in the uplink control information feedback window.
  • the base station assumes that for the HARQ-ACK fed back in any uplink subframe, the UE determines the length of the HARQ-ACK bits and the sequence the HARQ-ACK bits according to the number of PDSCH(s) actually transmitted by the base station, e.g., according to the total DAI and counter DAI. If the UE successfully transmits the HARQ-ACK bit corresponding to a downlink subframe, the HARQ-ACK bit is not transmitted in subsequent uplink subframes.
  • the base station detects the uplink control information in uplink subframe X 2 based on a detected result of the uplink control information in uplink subframe X 1 . For example, the base station needs to determine whether the UE has transmitted uplink control information in uplink subframe X 1 , so as to determine the length and sequence of the HARQ-ACK bits in the uplink control information in the uplink subframe X 2 .
  • the downlink burst includes subframes 0 ⁇ 3, the uplink burst includes subframes 4 ⁇ 7, and then follows another downlink burst including subframes 8 ⁇ 10.
  • UE 1 is configured with 4 CCs, wherein CC0 is a licensed carrier and is a Pcell, CC1 ⁇ CC3 are unlicensed carriers in the same PUCCH group, CC1 is a pScell for feeding back the HARQ-ACK of CC1 ⁇ CC3, and belongs to a PUCCH group different from CC0.
  • the description is provided merely with respect to CC1 ⁇ CC3 but not to CC0.
  • the feedback may be performed according to a conventional method.
  • the transmission modes of CC1 ⁇ CC3 are all to support up to 2 transmission blocks.
  • the base station transmits PDSCH for UE 1 on CC1 ⁇ CC3.
  • the base station transmits PDSCH for UE 1 on CC1.
  • the base station transmits PDSCH for UE 1 on CC1 and CC3.
  • the first uplink subframe corresponds to downlink subframe 0 is subframe 4, the feedback window includes subframes 4 ⁇ 7.
  • the first uplink subframe corresponds downlink subframe 1 is subframe 5, and the feedback window includes subframes 5 ⁇ 8.
  • the first uplink subframe corresponds downlink subframe 3 is subframe 7, and the feedback window includes subframes 7 ⁇ 10.
  • the effective feedback windows respectively include subframes 4 ⁇ 7, subframes 5 ⁇ 7 and subframe 7.
  • the base station detects uplink control information containing HARQ-ACK in uplink subframe 4.
  • the base station assumes that the HARQ-ACK of downlink subframe 0 is expected to be received in uplink subframe 4, which includes 6 bits.
  • the base station If the base station does not detect the uplink control information containing the HARQ-ACK in uplink subframe 4, the base station detects uplink control information containing HARQ-ACK in uplink subframe 5. The base station assumes that 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 are expected to be received in uplink subframe 5, a total of 8 bits.
  • the base station If the base station does not detect the uplink control information containing HARQ-ACK in uplink subframes 4 and 5, the base station detects uplink control information containing HARQ-ACK in uplink subframe 6. The base station assumes that the 6 HARQ-ACK bits of downlink subframe 0 and 2 HARQ-ACK bits of downlink subframe 1 are expected to be received in uplink subframe 6, a total of 8 bits.
  • the base station If the base station does not detect the uplink control information containing the HARQ-ACK before uplink subframe 7, the base station detects in uplink subframe 7.
  • the base station expects to receive 6 HARQ-ACK bits of downlink subframe 0, 2 HARQ-ACK bits of downlink subframe 1 and 4 HARQ-ACK bits of downlink subframe 3 in the uplink subframe 7, a total of 12 bits.
  • the base station assumes that, no matter whether the uplink control information containing the HARQ-ACK information is detected in an uplink subframe X 1 in the feedback window, the uplink control information detected in a following uplink subframe X 2 still includes the HARQ-ACK information transmitted by the UE in the uplink subframe X 1 .
  • the base station assumes that, if the detection in subframe 5 succeeds, the number of HARQ-ACK bits is 8. If the detection in subframe 6 succeeds, the number of HARQ-ACK bits is 8. If the detection in subframe 7 succeeds, the number of HARQ-ACK bits is 12.
  • the present disclosure provides a method for feeding back HARQ-ACK information. As shown in FIG. 16, the method includes the following.
  • a UE determines a first uplink subframe n+k for HARQ-ACK feedback of PDSCH(s) of a downlink subframe n, and determines an uplink control information feedback window starting from the first uplink subframe.
  • the length of the feedback window is configured by an eNB.
  • the length of the feedback window is defined by a system.
  • step 1602 the UE determines, in the uplink control information feedback window, a position of a subframe available for transmitting uplink control information containing at least HARQ-ACK, and determines an uplink carrier for transmitting the uplink control information in the subframe.
  • the UE determines HARQ-ACK bits to be transmitted according to the position of the subframe and the uplink carrier for transmitting the uplink control information containing at least the HARQ-ACK, and transmits the uplink control information containing at least the HARQ-ACK on the uplink carrier in the subframe.
  • the process that the UE determines the uplink carrier available for transmitting the uplink control information according to the position of the subframe for transmitting the uplink control information containing at least the HARQ-ACK includes: in the first uplink subframe of the uplink control information feedback window, a first uplink carrier is an uplink carrier determined according to a predefined criteria, e.g., the first uplink carrier is an uplink carrier with a minimum Scellindex among those scheduled to transmit PUSCH in the uplink subframe, and/or an uplink carrier indicated by higher layer signaling/physical layer signaling.
  • the UE attempts to transmit the uplink control information in a second uplink subframe in the uplink control information feedback window.
  • a second uplink carrier selected by the UE has a predefined relationship with the first uplink carrier in the first uplink subframe.
  • the uplink carrier transmitting the uplink control information in the second uplink subframe is an uplink carrier with a second minimum Scellindex among those actually being scheduled to transmit PUSCH in the second uplink subframe. It should be noted that, besides the uplink control information whose transmission is delayed (e.g.
  • the second uplink subframe may further carry the uplink control information whose transmission is not delayed (e.g., the uplink control information should be transmitted in the second uplink subframe).
  • the uplink control information whose transmission is not delayed is still transmitted on the uplink carrier with the minimum Scellindex among those scheduled to transmit PUSCH in the second uplink subframe. It can be seen that, the delayed and non-delayed uplink control information are transmitted on different uplink carriers, which avoids the impact to the non-delayed uplink control information brought out by the delayed uplink control information, e.g. the impact to the HARQ-ACK code book. The process proceeds similarly till the end of the uplink control information feedback window.
  • the eNB configures 1 licensed carrier CC0 and 2 unlicensed carriers CC1 and CC2 for the UE.
  • the HARQ-ACK feedback for CC0 may be implemented according to a conventional method.
  • FIG. 17 merely shows the implementation for CC1 and CC2.
  • the first uplink subframe corresponding to downlink subframe 0 is uplink subframe 4, the first uplink carrier is CC1, the second uplink subframe is uplink subframe 5, and the second uplink carrier is CC2.
  • the first uplink subframe corresponding to downlink subframe 1 is uplink subframe 5, and the first uplink carrier is CC1.
  • the UE feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 0 in uplink subframe 4, and feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 1 in uplink subframe 5.
  • the UE If the UE does not finish the LBT detection on uplink carrier CC1 before uplink subframe 4, finishes the LBT on CC1 before uplink subframe 5 but does not finish the LBT on CC2, the UE feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 1 in uplink subframe 5 on uplink carrier 1, and gives up the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 0.
  • the UE If the UE does not finish the LBT on CC1 before uplink subframe 4, but finishes the LBT on CC1 and the LBT on CC2 before uplink subframe 5, the UE feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 1 in uplink subframe 5 on CC1, and feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 0 in subframe 5 on CC2.
  • the UE If the UE does not finish the LBT on CC1 before uplink subframe 4, and does not finish the LBT on CC1 before uplink subframe 5, but finishes the LBT on CC2 before uplink subframe 5, the UE feeds back the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 0 in uplink subframe 5 on CC2, and gives up the HARQ-ACK of downlink carriers CC1 and CC2 of downlink subframe 1. If the UE does not finish the LBT on CC1 and CC2 in subframes 5 and 6, the UE gives up all HARQ-ACK feedback.
  • the present disclosure provides a method for feeding back HARQ-ACK information. As shown in FIG. 18, the method includes the following.
  • a UE determines an uplink subframe n+k for HARQ-ACK feedback of PDSCH(s) in a downlink subframe n, and determines whether periodic CSI needs to be fed back in uplink subframe n+k.
  • step 1802 the UE feeds back in the uplink subframe n+k, a first type ACK/NACK on a first uplink carrier and/or a second type ACK/NACK on a second uplink carrier, and/or the periodic CSI on a third uplink carrier.
  • the first type ACK/NACK includes the ACK/NACK of some or all carriers in a first type PUCCH group, the some or all carriers do not belong to a second type PUCCH group.
  • the second type ACK/NACK includes ACK/NACK of carriers in the second type PUCCH group.
  • the first type ACK/NACK includes at least ACK/NACK of a licensed carrier.
  • the second type ACK/NACK includes ACK/NACK of unlicensed carriers.
  • the first uplink carrier is a licensed carrier in the first type PUCCH group. If the UE support simultaneous transmission of the PUCCH and PUSCH, the first uplink carrier is an uplink carrier available for transmitting the PUCCH in the first type PUCCH group, e.g. Pcell and/or pScell defined in existing standards, generally a licensed carrier. If the UE does not support simultaneous transmission of PUCCH and PUSCH, the first uplink carrier is an uplink carrier available for transmitting PUCCH in the first type PUCCH group or a licensed carrier in the first type PUCCH group.
  • the first uplink carrier is an uplink carrier available for transmitting PUCCH in the first type PUCCH group or a licensed carrier in the first type PUCCH group.
  • the second uplink carrier is a licensed carrier and/or an unlicensed carrier in the second type PUCCH group.
  • the third uplink carrier is a licensed carrier.
  • the third uplink carrier is a licensed carrier in the first type PUCCH group.
  • the third uplink carrier is a licensed carrier corresponding to the second type PUCCH group configured by the base station.
  • the licensed carrier may not belong to the second PUCCH group.
  • the UE may feed back the period CSI on the third uplink carrier according to any one or any combination of the following manners.
  • Manner 1 if the UE is configured to be able to transmit PUCCH and PUSCH simultaneously, and the UE is scheduled to transmit PUSCH on at least one licensed carrier in subframe n+k, and there is no first type ACK/NACK needs to be fed back on the first uplink carrier, the UE feeds back the periodic CSI on the PUCCH of the third uplink carrier Pcell and/or pScell.
  • the UE is configured to be able to transmit PUCCH and PUSCH simultaneously, and the UE is scheduled to transmit PUSCH on at least one licensed carrier in subframe n+k, and it is required to feed back first type ACK/NACK on the first uplink carrier, the UE feeds back the first type ACK/NACK on the PUCCH of the first uplink carrier Pcell/pScell, selects a carrier from the at least one licensed carrier scheduled for transmitting the PUSCH as the third uplink carrier, and transmits the periodic CSI on the PUSCH of the third uplink carrier (it should be noted that, the first uplink carrier and the third uplink carrier may be the same uplink carrier, or different uplink carriers, but both of them are licensed carriers).
  • the UE is configured to be able to transmit PUCCH and PUSCH simultaneously, the UE is merely scheduled to transmit PUSCH on at least one unlicensed carrier in subframe n+k, but is not scheduled to transmit PUSCH on licensed carrier, the UE feeds back the periodic CSI and/or the first type ACK/NACK on the PUCCH of the third uplink carrier Pcell and/or pScell. At this time, the first uplink carrier and the third uplink carrier are the same carrier. In this manner, the transmission of the PUSCH on the unlicensed carrier is generally not affected by the transmission on the licensed carrier.
  • Manner 2 if the UE is not configured to be able to transmit PUCCH and PUSCH simultaneously, and the UE is scheduled to transmit PUSCH on at least one licensed carrier in subframe n+k, the UE selects a carrier from those scheduled to transmit the PUSCH according to a predefined rule as the third uplink carrier, and feeds back the periodic CSI and/or the first type ACK/NACK on the PUSCH of the third uplink carrier. At this time, the first uplink carrier and the third uplink carrier are the same carrier.
  • the UE feeds back the periodic CSI and/or the first type ACK/NACK and/or the second type ACK/NACK on the PUCCH of the third uplink carrier Pcell and/or pScell, and does not transmit the PUSCH on the unlicensed carrier.
  • the first uplink carrier and the third uplink carrier are the same carrier.
  • the transmission of the PUSCH on the unlicensed carrier is generally affected by the transmission of the PUCCH on the licensed carrier, i.e., if PUCCH is transmitted on the licensed carrier, the PUSCH cannot be transmitted on the unlicensed carrier.
  • the second type ACK/NACK is generally transmitted on merely the second uplink carrier.
  • the second type PUCCH group includes at least one uplink carrier transmitting PUCCH
  • the second type ACK/NACK is transmitted on the second uplink carrier.
  • the transmission is on the first uplink carrier.
  • the eNB configures 5 carriers for the UE, wherein CC1 and CC2 are licensed carriers, CC3 ⁇ CC5 are unlicensed carrier.
  • CC1 is a Pcell
  • CC1 ⁇ CC5 belong to the same first type PUCCH group.
  • the PUCCH may be transmitted on CC1.
  • CC3 ⁇ CC5 belong to the same second type PUCCH group.
  • the ACK/NACK of CC1 and CC2 can only be transmitted on the PUCCH of CC1 or the PUSCH of CC1/CC2. In most cases, the ACK/NACK of CC3 ⁇ CC5 is not transmitted on CC1/CC2.
  • the ACK/NACK is transmitted on the at least one PUSCH on CC3 ⁇ CC5.
  • the ACK/NACK of CC3 ⁇ CC5 may be transmitted on CC1/CC2, e.g., when there is no PUSCH transmission on any one of CC3 ⁇ CC5.
  • the periodic CSI the periodic CSI of any one of CC1 ⁇ CC5 cannot be transmitted on CC3 ⁇ CC5, i.e., can only be transmitted on CC1/CC2.
  • the eNB schedules the UE in subframe n to transmit PUSCH on the CC2, CC3 and CC5 in subframe n+4.
  • the UE needs to feed back the ACK/NACK of CC1 ⁇ CC5 and the periodic CSI of CC3.
  • the UE is configured to be able to transmit PUCCH and PUSCH simultaneously.
  • the UE feeds back the ACK/NACK of CC1 and CC2 on the PUCCH on CC1, transmits PUSCH on CC2, and feeds back the periodic CSI of CC3 on the PUSCH on CC2.
  • the UE performs LBT detection on CC3 and CC5, transmits PUSCH on the CC on which the LBT detection succeeds, and feeds back the ACK/NACK of CC3 ⁇ CC5 on the PUSCH on one or more CCs on which the LBT detection succeeds according to a predefined rule.
  • the predefined rule may be configured according to method described in other embodiments of the present disclosure or according to a conventional method.
  • the eNB schedules in subframe n the UE to transmit PUSCH in subframe n+4 on CC3 and CC5.
  • the UE needs to feed back the ACK/NACK of CC1 ⁇ CC5 and the periodic CSI of CC3.
  • the UE is configured to be able to transmit PUCCH and PUSCH simultaneously.
  • the UE feeds back the ACK/NACK of CC1 and CC2 on the PUCCH of CC1, and feeds back the periodic CSI of CC3 on the PUCCH of CC1.
  • the UE performs an LBT detection on CC3 and CC5, transmits PUSCH on the CC on which the LBT detection succeeds, and transmits the ACK/NACK of CC3 ⁇ CC5 on the PUSCH of one or more CCs on which the LBT detection succeeds according to a predefined rule. It can be seen that, in order to ensure that the periodic CSI (whether the periodic CSI of the licensed carrier or the periodic CSI of the unlicensed carrier) is not transmitted on the unlicensed carrier, if there is at least one licensed carrier in the same first type PUCCH group transmitting PUSCH, the periodic CSI can be transmitted on the PUSCH of the at least one licensed carrier.
  • the periodic CSI can only be transmitted on the PUCCH of the Pcell or pScell, but not transmitted on the PUSCH of the unlicensed carrier.
  • the PUSCH of the licensed carrier for transmitting the periodic CSI the PUSCH of a carrier with a minimum Scellindex among those transmitting PUSCH may be selected.
  • Manner 3 if the UE successfully transmits PUSCH and HARQ-ACK on one uplink carrier of the second type PUCCH group in subframe n+k, and the UE needs to transmit the periodic CSI of downlink carriers of the second type PUCCH group, the UE transmits the periodic CSI on a licensed carrier (the third uplink carrier) corresponding to the second type PUCCH group configured by the base station.
  • the third uplink carrier may carry the periodic CSI by the PUCCH or PUSCH.
  • the transmission of the periodic CSI of the downlink carriers corresponding to the third uplink carrier may be performed according to a conventional method, i.e., transmitting on a licensed carrier, e.g. the Pcell/pScell of the first type PUCCH group.
  • This embodiment provides a method for transmitting uplink control information on an unlicensed carrier, including the following.
  • a UE receives a UL grant scheduling a PUSCH on an unlicensed carrier.
  • step 2102 the UE determines whether the UL grant received in step 2101 is used for scheduling the UE to transmit PUSCH carrying uplink data, or used for scheduling the UE to transmit PUSCH carrying merely uplink control signaling.
  • the UE determines that the PUSCH scheduled by the base station does not carry uplink data (no TB for UL-SCH), the UE reports merely uplink control information.
  • the UE determines that the PUSCH scheduled by the base station does not carry uplink data (no TB for UL-SCH), the UE reports merely uplink control information.
  • one interlace includes a group of PRBs with equal intervals in the frequency domain. For example, on a 20MHz system bandwidth, 10 PRBs with equal intervals form a group, which corresponds to one interlace.
  • step 2103 the UE transmits uplink data or merely transmits uplink control signaling according to a transmission mode of the PUSCH determined according to the UL grant.
  • the apparatus includes a receiving module and a feedback module; wherein
  • the receiving module is configured to receive a DL-GRANT scheduling downlink HARQ transmission in a time-frequency bundling window corresponding to an uplink subframe responsible for HARQ-ACK feedback and/or time-frequency bundling windows corresponding to all uplink subframes in a feedback window of uplink subframes responsible for HARQ-ACK feedback, obtain a DL DAI and/or a total DAI and/or a counter DAI in the DL-GRANT, and determine a mapping value of each DAI; and
  • the feedback module is configured to map HARQ-ACK bits of each HARQ feedback unit to corresponding bits of a feedback bit sequence according to the mapping value of the corresponding DAI.
  • the functional modules in the embodiments of the present disclosure may be integrated into one processing module, or may be independent from each other. Or, two or more of the above modules may be integrated in one module.
  • the integrated module may be implemented in form of hardware of software functional module. If the integrated module is implemented via software functional module and is sold or used as an independent product, the integrated module may be stored in a computer readable storage medium.
  • the above storage medium may be read only memory, disk, or compact disk, etc.

Abstract

La présente invention concerne un procédé de renvoi d'informations d'accusé de réception de HARQ. Dans le procédé selon l'invention, un UE reçoit une émission HARQ de liaison descendante de programmation de DL-GRANT dans la fenêtre de regroupement temps-fréquence correspondant à une sous-trame respective de liaison montante servant à renvoyer à son tour un accusé de réception de HARQ, obtient un DAI DL dans le DL-GRANT, et détermine une valeur de mappage de chaque DAI DL; mappe ensuite des bits d'accusé de réception de HARQ de la fenêtre de regroupement temps-fréquence correspondant à la sous-trame respective de liaison montante servant à renvoyer l'accusé de réception de HARQ, sur des bits correspondants d'une suite de bits de renvoi d'après la valeur de mappage du DAI DL; puis émet l'accusé de réception HARQ sur une porteuse de liaison montante disponible.
PCT/KR2017/003079 2016-04-01 2017-03-22 Procédé et appareil pour le renvoi d'informations d'accusé de réception de harq WO2017171299A1 (fr)

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CN201610298403.8A CN107294665A (zh) 2016-04-01 2016-05-06 Harq-ack信息的反馈方法及设备

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CN112385164A (zh) * 2018-05-11 2021-02-19 株式会社Ntt都科摩 用户终端
WO2019242527A1 (fr) * 2018-06-21 2019-12-26 维沃移动通信有限公司 Procédé et dispositif de traitement d'informations de rétroaction de demande de répétition automatique hybride (harq-ack)
CN110635868A (zh) * 2018-06-21 2019-12-31 维沃移动通信有限公司 混合自动重传请求反馈信息harq-ack处理方法及装置
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CN112703800A (zh) * 2018-09-20 2021-04-23 华为技术有限公司 用于报告关于来自多个发送接收点的多个下行链路分配的系统和方法
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WO2020057339A1 (fr) 2018-09-20 2020-03-26 Huawei Technologies Co., Ltd. Système et procédé pour rendre compte par rapport à de multiples attributions de liaison descendante à partir de multiples points de réception de transmission
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WO2021057977A1 (fr) * 2019-09-26 2021-04-01 中兴通讯股份有限公司 Procédé et appareil de rétroaction de livre de codes, dispositif et support de stockage
CN114938701A (zh) * 2019-11-08 2022-08-23 联想（新加坡）私人有限公司 用于管理反馈消息的传输的方法及设备
WO2021090298A1 (fr) * 2019-11-08 2021-05-14 Lenovo (Singapore) Pte. Ltd. Procédé et appareil de gestion de la transmission d'un message de rétroaction
WO2021146026A1 (fr) * 2020-01-16 2021-07-22 Qualcomm Incorporated Sélection d'un mode de rapport d'informations de commande de liaison montante
US11956717B2 (en) 2020-01-16 2024-04-09 Qualcomm Incorporated Techniques for selecting an uplink control information reporting mode
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US11812418B2 (en) 2020-07-16 2023-11-07 Qualcomm Incorporated Transmit delay sensitive uplink control on secondary carrier
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