WO2020029189A1 - Transmission de rétroaction harq - Google Patents

Transmission de rétroaction harq Download PDF

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Publication number
WO2020029189A1
WO2020029189A1 PCT/CN2018/099686 CN2018099686W WO2020029189A1 WO 2020029189 A1 WO2020029189 A1 WO 2020029189A1 CN 2018099686 W CN2018099686 W CN 2018099686W WO 2020029189 A1 WO2020029189 A1 WO 2020029189A1
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WO
WIPO (PCT)
Prior art keywords
harq
group
signaling
harq process
indication
Prior art date
Application number
PCT/CN2018/099686
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English (en)
Inventor
Zhe LUO
Tao Tao
Jianguo Liu
Zhuo WU
Yan Meng
Gang Shen
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201880096459.2A priority Critical patent/CN112585928B/zh
Priority to PCT/CN2018/099686 priority patent/WO2020029189A1/fr
Priority to TW108128338A priority patent/TWI727385B/zh
Publication of WO2020029189A1 publication Critical patent/WO2020029189A1/fr

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    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • 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
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • 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
    • 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

  • Embodiments of the present disclosure generally relate to the field of telecommunications, and in particular, to a method, device and computer readable medium for Hybrid Automatic Repeat Request (HARQ) feedback transmission.
  • HARQ Hybrid Automatic Repeat Request
  • a HARQ mechanism In telecommunication networks such as those based on the 3rd Generation Partnership Project (3GPP) specifications, a HARQ mechanism is employed.
  • a receiver detects whether there are errors in a packet received from a transmitter. If no error is detected in the received packet, the receiver will transmit a positive acknowledge (ACK) to the transmitter. On the other hand, if an uncorrectable error is detected in the received packet, the receiver will transmit a negative acknowledge (NACK) to the transmitter. In response to the NACK, the transmitter retransmits the discarded packet.
  • ACK and NACK may be collectively referred to as HARQ feedbacks.
  • NR new radio
  • NR-U new radio
  • a terminal device detects whether a slot is idle or busy before it starts transmission of a HARQ feedback to a network device at this slot, which is called as a listen-before-talk (LBT) process. If the LBT process fails, the terminal device may fail to transmit the HARQ feedback to the network device at this slot. Thus, HARQ feedback transmission opportunities are reduced due to the failure of the LBT process.
  • LBT listen-before-talk
  • example embodiments of the present disclosure provide a method, device and computer readable medium for HARQ feedback transmission.
  • a communication method comprises grouping, at a network device, a plurality of Hybrid Automatic Repeat Request, HARQ, processes for a terminal device into at least one HARQ group.
  • the method also comprises in response to a failure of reception of a HARQ feedback for a HARQ process in the at least one HARQ group, transmitting to the terminal device a first signaling for triggering transmission of the HARQ feedback, the first signaling comprising an indication for the at least one HARQ group.
  • grouping the plurality of HARQ processes comprises: determining a first timing indicator for a first HARQ process of the plurality of HARQ processes and a second timing indicator for a second HARQ process of the plurality of HARQ processes; determining whether the first and second HARQ processes share an initial HARQ feedback transmission occasion based on the first and second timing indicators; and in response to determining that the first and second HARQ processes share the initial HARQ feedback transmission occasion, grouping the first and second HARQ processes into a first HARQ group.
  • grouping the plurality of HARQ processes comprises: determining whether a first downlink grant associated with a third HARQ process of the plurality of HARQ processes and a second downlink grant associated with a fourth HARQ process of the plurality of HARQ processes are transmitted in a single control resource set; and in response to determining that the first and second downlink grants are transmitted in a single control resource set, grouping the third HARQ process and the fourth HARQ process into a second HARQ group of the at least one HARQ group.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the method further comprises: transmitting to the terminal device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a fifth HARQ process of the plurality of HARQ processes, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the fifth HARQ process is grouped.
  • the method further comprises: transmitting to the terminal device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a sixth HARQ process of the plurality of HARQ processes, the sixth HARQ process associated with the further downlink transmission, and an index of the sixth HARQ process in a further HARQ group into which the sixth HARQ process is grouped.
  • transmitting the first signaling comprises: in response to a failure of reception of a HARQ feedback for the sixth HARQ process, transmitting the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the sixth HARQ process.
  • a communication method comprises receiving from a network device a first signaling for triggering transmission of at least one Hybrid Automatic Repeat Request, HARQ, feedback for at least one HARQ process, the first signaling comprising an indication for at least one HARQ group.
  • the method also comprises determining whether the indication indicates one or more HARQ groups into which the at least one HARQ process is grouped.
  • the method also comprises in response to determining that the indication indicates the one or more HARQ groups, transmitting to the network device the HARQ feedback.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the method further comprises: receiving from the network device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a HARQ process of the at least one HARQ process, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the HARQ process is grouped.
  • determining whether the indication indicates the one or more HARQ groups comprises: determining whether the indication for the at least one HARQ group in the first signaling is identical to the indication for the HARQ group.
  • determining whether the indication indicates the one or more HARQ groups comprises: determining an initial HARQ feedback transmission occasion for a second HARQ process of the at least one HARQ process based on a timing indicator for the second HARQ process received from the network device; determining, based on the initial HARQ feedback transmission occasion, a HARQ group into which the second HARQ process is grouped; and determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • determining whether the indication indicates the one or more HARQ group comprises: determining, based on a control resource set, a HARQ group into which a third HARQ process of the at least one HARQ process is grouped, a downlink grant associated with the third HARQ process being transmitted on the control resource set; and determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • the method further comprises: receiving from the network device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a fourth HARQ process of the at least one HARQ process, the fourth HARQ process associated with the further downlink transmission, and an index of the fourth HARQ process in a further HARQ group into which the fourth HARQ process is grouped.
  • receiving the first signaling comprises: receiving the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the fourth HARQ process.
  • a network device comprising at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the device to carry out the method according to the first aspect.
  • a terminal device comprises at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the device to carry out the method according to the second aspect.
  • a computer-readable medium storing a computer program thereon.
  • the computer program when executed by a processor, causes the processor to carry out the method according to the first aspect.
  • a computer-readable medium storing a computer program thereon.
  • the computer program when executed by a processor, causes the processor to carry out the method according to the second aspect.
  • Fig. 1 shows an example communication network in which embodiments of the present disclosure can be implemented
  • Fig. 2 is a signaling chart of an example process for HARQ feedback transmission in accordance with some embodiments of the present disclosure
  • Fig. 3 is a flowchart of a method of HARQ feedback transmission in accordance with some embodiments of the present disclosure
  • Fig. 4 is a flowchart of a method of HARQ feedback transmission in accordance with some embodiments of the present disclosure.
  • Fig. 5 is a block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “communication network” refers to a network that follows any suitable communication standards or protocols such as long term evolution (LTE) , LTE-Advanced (LTE-A) and 5G NR, and employs any suitable communication technologies, including, for example, MIMO, OFDM, time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, machine type communication (MTC) , eMBB, mMTC and uRLLC technologies.
  • LTE network, the LTE-A network, the 5G NR network or any combination thereof is taken as an example of the communication network.
  • the term “network device” refers to any suitable device at a network side of a communication network.
  • the network device may include any suitable device in an access network of the communication network, for example, including a base station (BS) , a relay, an access point (AP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a gigabit NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • the eNB is taken as an example of the network device.
  • the network device may also include any suitable device in a core network, for example, including multi-standard radio (MSR) radio equipment such as MSR BSs, network controllers such as radio network controllers (RNCs) or base station controllers (BSCs) , Multi-cell/multicast Coordination Entities (MCEs) , Mobile Switching Centers (MSCs) and MMEs, Operation and Management (O&M) nodes, Operation Support System (OSS) nodes, Self-Organization Network (SON) nodes, positioning nodes, such as Enhanced Serving Mobile Location Centers (E-SMLCs) , and/or Mobile Data Terminals (MDTs) .
  • MSR multi-standard radio
  • RNCs radio network controllers
  • BSCs base station controllers
  • MCEs Multi-cell/multicast Coordination Entities
  • MSCs Mobile Switching Centers
  • OFM Operation and Management
  • OSS Operation Support System
  • SON Self-Organization Network
  • positioning nodes such as Enhanced Serving Mobile Location Centers
  • the term “terminal device” refers to a device capable of, configured for, arranged for, and/or operable for communications with a network device or a further terminal device in a communication network.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the terminal device may be configured to transmit and/or receive information without direct human interaction. For example, the terminal device may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • terminal device examples include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , and/or wireless customer-premises equipment (CPE) .
  • UE user equipment
  • LME laptop-embedded equipment
  • CPE wireless customer-premises equipment
  • the term “cell” refers to an area covered by radio signals transmitted by a network device.
  • the terminal device within the cell may be served by the network device and access the communication network via the network device.
  • circuitry may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and/or digital circuitry) ; and (b) combinations of hardware circuits and software, such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) ; and (c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
  • hardware circuits and or processor such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g.,
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • Fig. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a network device 110 and a terminal device 120 served by the network device 110.
  • the serving area of the network device 110 is called as a cell 102.
  • the network 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices may be located in the cell 102 and served by the network device 110.
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Extended Coverage Global System for Mobile Internet of Things (EC-GSM-IoT) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , and the like.
  • GSM Global System for Mobile Communications
  • E-GSM-IoT Extended Coverage Global System for Mobile Internet of Things
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the network device 110 can communicate data and control information to the terminal device 120 and the terminal device 120 can also communicate data and control information to the network device 110.
  • a link from the network device 110 to the terminal device 120 is referred to as a downlink (DL)
  • a link from the terminal device 120 to the network device 110 is referred to as an uplink (UL) .
  • HARQ feedback transmission opportunities for Physical Downlink Shared Channel are determined based on PDSCH-to-HARQ feedback timing indicator given in the corresponding DL grants.
  • the terminal device will report feedback for one or more DL HARQ processes at the feedback transmission opportunity determined based on PDSCH-to-HARQ feedback timing indicator.
  • HARQ feedback transmission may be blocked due to failure of the LBT process.
  • NR does not provide additional feedback transmission opportunities for those blocked ones.
  • sPUCCH Short Physical Uplink Control Channel
  • ePUCCH Extended Physical Uplink Control Channel
  • a network device groups a plurality of HARQ processes for a terminal device into at least one HARQ group. Each HARQ group is assigned an indication for the group. If the network device fails to receive HARQ feedbacks for one or more HARQ processes in one or more HARQ groups, the network device transmits to the terminal device a signaling for triggering transmission of the HARQ feedbacks.
  • the signaling comprises an indication for the one or more HARQ groups.
  • the terminal device may transmit HARQ feedbacks for HARQ processes in one or more HARQ groups indicated by the network device, instead of transmitting HARQ feedbacks for all of the configured HARQ processes.
  • feedback overhead may be reduced.
  • the network device since the network device provides an explicit indication for one or more HARQ groups, misunderstanding between the network device and the terminal device may be avoided.
  • Fig. 2 shows a process 200 for HARQ feedback transmission according to an embodiment of the present disclosure.
  • the process 200 will be described with reference to Fig. 1.
  • the process 200 may involve the network device 110 and the terminal device 120 in Fig. 1.
  • the network device 110 groups (210) a plurality of HARQ processes for the terminal device 120 into at least one HARQ group.
  • the network device 110 determines a first timing indicator for a first HARQ process of the plurality of HARQ processes and a second timing indicator for a second HARQ process of the plurality of HARQ processes.
  • a timing indicator for a HARQ process may indicate time from reception of DL transmission to transmission of an initial HARQ feedback for a HARQ process associated with the DL transmission.
  • the network device 110 may determine whether the first and second HARQ processes share an initial HARQ feedback transmission occasion. Examples of the timing indicator include, but not limited to, PDSCH-to-HARQ feedback timing indicator.
  • the network device 110 transmits first DL transmission at slot #0, second DL transmission at slot #1, third DL transmission at slot #3, and fourth DL transmission at slot #4.
  • the first DL transmission is associated with the first HARQ process with an identity (ID) of 6 (which is also referred to as the first HARQ process #6) .
  • the second DL transmission is associated with the second HARQ process with an ID of 3 (which is also referred to as the second HARQ process #3) .
  • the third DL transmission is associated with a third HARQ process with an ID of 2 (which is also referred to as the third HARQ process #2) .
  • the fourth DL transmission is associated with a fourth HARQ process with an ID of 9 (which is also referred to as the fourth HARQ process #9) .
  • PDSCH-to-HARQ feedback timing indicator for the first HARQ process #6 indicates 5 slots from reception of the first DL transmission to transmission of an initial HARQ feedback for the first HARQ process #6.
  • PDSCH-to-HARQ feedback timing indicator for the second HARQ process #3 indicates 4 slots from reception of the second DL transmission to transmission of an initial HARQ feedback for the second HARQ process #3.
  • PDSCH-to-HARQ feedback timing indicator for the third HARQ process #2 indicates 4 slots from reception of the third DL transmission to transmission of an initial HARQ feedback for the third HARQ process #2.
  • PDSCH-to-HARQ feedback timing indicator for the fourth HARQ process #9 indicates 3 slots from reception of the fourth DL transmission to transmission of an initial HARQ feedback for the fourth HARQ process #9.
  • the network device 110 determines an initial HARQ feedback transmission occasion for the HARQ feedback for the first HARQ process #6 as slot #5.
  • the network device 110 determines an initial HARQ feedback transmission occasion for the HARQ feedback for the second HARQ process #3 as slot #5.
  • the network device 110 may determine that the first HARQ process #6 and the second HARQ process #3 share the same initial HARQ feedback transmission occasion at slot #5.
  • the network device 110 groups the first HARQ process #6 and the second HARQ process #3 into a first HARQ group. In the case where a total number of all HARQ groups is four, the network device 110 may determine ID for the first HARQ group to be #1 (i.e., 5 mod 4) .
  • the network device 110 determines an initial HARQ feedback transmission occasion for the HARQ feedback for the third HARQ process #2 as slot #7.
  • the network device 110 determines an initial HARQ feedback transmission occasion for the HARQ feedback for the fourth HARQ process #9 as slot #7.
  • the network device 110 may determine that the third HARQ process #2 and the fourth HARQ process #9 share the same initial HARQ feedback transmission occasion at slot #7.
  • the network device 110 groups the third HARQ process #2 and the fourth HARQ process #9 into a second HARQ group. In the case where the total number of all HARQ groups is four, the network device 110 may determine ID for the second HARQ group to be #3 (i.e., 7 mod 4) .
  • the network device 110 determines whether a first DL grant associated with a fifth HARQ process of the plurality of HARQ processes and a second DL grant associated with a sixth HARQ process of the plurality of HARQ processes are transmitted in a single control resource set (CORSET) . For example, if both of the first DL grant and the second DL grant are transmitted in the CORSET at slot #0, the network device 110 may determine that the first and second DL grants are transmitted in a single (same) CORSET. Accordingly, the network device 110 may group the fifth HARQ process and the sixth HARQ process into a third HARQ group.
  • CORSET control resource set
  • the grouping in accordance with the present disclosure are dynamic grouping, which varies from scheduling to scheduling.
  • the dynamic grouping avoids the inefficiency of static grouping.
  • the network device 110 if the network device 110 fails to receive a HARQ feedback for a HARQ process in the at least one HARQ group, the network device 110 transmits (220) to the terminal device 120 a first signaling for triggering transmission of the HARQ feedback.
  • the first signaling comprises an indication for the at least one HARQ group. Because the first signaling for triggering comprises an indication for the at least one HARQ group, instead of explicit identities for the triggered HARQ processes, the overhead for triggering may be reduced.
  • the terminal device 120 receives the first signaling for triggering transmission of the HARQ feedback.
  • the indication for the at least one HARQ group in the first signaling for triggering may comprise an identity of the at least one HARQ group.
  • the indication for the at least one HARQ group in the first signaling for triggering comprises a bitmap.
  • Bits in the bitmap are associated with the at least one HARQ group. For example, a first bit in the bitmap may be associated with the first HARQ group #1, and a second bit in the bitmap may be associated with the second HARQ group #3. If a bit in the bitmap is set to be 1, it indicates that HARQ feedbacks for HARQ process in the associated HARQ group are triggered for transmission. If a bit in the bitmap is set to be 0, it indicates that HARQ feedbacks for HARQ processes in the associated HARQ group are not triggered for transmission.
  • the first signaling for triggering may comprise downlink control information (DCI) of a UL grant of Physical Uplink Control Channel (PUCCH) for uplink control information (UCI) of HARQ feedbacks.
  • DCI downlink control information
  • PUCCH Physical Uplink Control Channel
  • the DCI may include the following items: Triggered HARQ group ID (2 bits) , and PUCCH resource indicator (3 bits) .
  • the DCI may include the following items: Triggered HARQ group bitmap (4 bits) and PUCCH resource indicator (3 bits) .
  • the network device 110 may trigger transmission of HARQ feedbacks for HARQ processes in more than one HARQ groups.
  • the network device 110 may transmit to the terminal device 120 the first signaling for triggering that comprises the bitmap for the more than one HARQ groups.
  • the first signaling for triggering may comprise the bitmap of 0101, indicating the first HARQ group #1 and the second HARQ group #3 to be triggered.
  • the network device 110 may trigger transmission of HARQ feedbacks for part of HARQ processes in a HARQ group.
  • the network device 110 may assign each of the HARQ processes in the HARQ group with an index. The index may be different from the ID for the respective HARQ process.
  • the network device 1 10 may transmit to the terminal device 120 a signaling comprising IDs for the HARQ processes in the HARQ group and indexes for the HARQ processes.
  • the signaling may comprise DCI of one or more DL grants of PDSCH for DL transmissions.
  • a DL grant of PDSCH for DL transmission may include the following items: HARQ process ID (3 bits) , Index for the HARQ process (2 bits) , Downlink Assignment Index (2 bits) , PDSCH-to-HARQ timing indicator (3 bits) and CBG transmission information (4 bits) .
  • the network device 110 transmits three DL grants in the same CORSET at slot #0.
  • the three DL grants are used for scheduling DL transmissions associated with HARQ processes #6, #3 and #10, respectively.
  • HARQ processes #6, #3 and #10 may be grouped into HARQ group #0 (0 mod 4, where “0” means the slot #0 and the total number of all the HARQ groups is four) .
  • the network device 110 may assign HARQ processes #6, #3 and #10 with index #0, #1 and #2. If the network device 110 fails to receive HARQ feedbacks for HARQ processes #6 and #10, the network device 110 may transmit a signaling for triggering transmission of HARQ feedbacks for HARQ processes #6 and #10.
  • the signaling for triggering may comprise ID for the HARQ group (HARQ group #0) and a bitmap. Bits in the bitmap are associated with indexes of the triggered HARQ processes. For example, bitmap may be 1010, indicating HARQ processes with index #0 and #2 to be triggered.
  • the terminal device 120 determines (230) whether the indication in the first signaling indicates one or more HARQ groups into which at least one HARQ process is grouped.
  • the terminal device 120 determines whether the indication in the first signaling indicates one or more HARQ groups into which at least one HARQ process is grouped.
  • the network device 110 transmits to the terminal device 120 a second signaling for scheduling DL transmission.
  • the second signaling may at least comprise: an identity of a HARQ process associated with the DL transmission; and an indication for a HARQ group into which the HARQ process is grouped.
  • the second signaling for scheduling DL transmission may comprise DCI of a DL grant of PDSCH for DL transmission.
  • the DCI may include the following items: HARQ group ID (2 bits) , HARQ process ID (3 bits) , Downlink Assignment Index (2 bits) , PDSCH-to-HARQ timing indicator (3 bits) , Code Block Group (CBG) transmission information (4 bits) .
  • the terminal device 120 may know that the HARQ process is grouped into the HARQ group indicated by the indication in the second signaling.
  • the terminal device 120 may determine whether the indication for the at least one HARQ group in the first signaling is identical to the indication for the HARQ group in the second signaling.
  • the terminal device 120 determines that the indication for the at least one HARQ group in the first signaling is identical to the indication for the HARQ group in the second signaling, the terminal device 120 determines that the indication in the first signaling indicates one or more HARQ groups into which at least one HARQ process is grouped.
  • no explicit indication for the one or more HARQ groups is received in the second signaling from the network device 110. Instead, the terminal device 120 determines an identity for a HARQ group into which a HARQ process is grouped based on an initial HARQ feedback transmission occasion for the HARQ process.
  • the terminal device 120 may receive PDSCH-to-HARQ timing indicator for the HARQ process in the second signaling for scheduling DL transmission associated with the HARQ process.
  • the terminal device 120 may determine the initial HARQ feedback transmission occasion for the HARQ process based on the PDSCH-to-HARQ timing indicator. For example, based on the PDSCH-to-HARQ timing indicator, the terminal device 120 may determine the initial HARQ feedback transmission occasion for the HARQ process to be slot #5. In the case where a total number of all HARQ groups is four, the terminal device 120 may determine that the identity for the HARQ group to be #1 (i.e., 5 mod 4) . The total number of all HARQ groups may be pre-configured or signaled by the network device 110.
  • no explicit indication for the one or more HARQ groups is received in the second signaling from the network device 110.
  • the terminal device 120 determines an identity for a HARQ group into which the HARQ process is grouped. For example, if the DL grant is received in the CORSET at slot #0 and a total number of all HARQ groups is four, the terminal device 120 may determine the identity for the HARQ group to be #0 (i.e., 0 mod 4) .
  • the terminal device 120 determines that the indication in the first signaling indicates the one or more HARQ groups, the terminal device 120 transmits (240) to the network device 110 the HARQ feedback.
  • the signaling for triggering may comprise a PUCCH resource indicator indicating the resource for transmission of one or more HARQ feedbacks.
  • the signaling for scheduling DL transmission may comprise Downlink Assignment Index (DAI) .
  • DAI Downlink Assignment Index
  • the terminal device 120 may determine positions of bits of a HARQ feedback based on the DAI.
  • the terminal device 120 may determine positions of bits of HARQ feedbacks for each triggered HARQ group based on the DAIs received in the signaling for scheduling DL transmission. Then, the terminal device 120 may transmit to the network device 110 a concatenation of bits of HARQ feedbacks for each triggered HARQ group. For example, bits of HARQ feedbacks for HARQ group #1 are 1110
  • Fig. 3 is a flowchart of a method 300 for HARQ feedback transmission in accordance with some embodiments of the present disclosure.
  • the method 300 can be implemented at the network device 110 as shown in Fig. 1. It is to be understood that the method 300 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the network device 110 groups a plurality of HARQ processes for a terminal device 120 into at least one HARQ group.
  • the network device 110 transmits to the terminal device 120 a first signaling for triggering transmission of the HARQ feedback.
  • the first signaling comprises an indication for the at least one HARQ group.
  • grouping the plurality of HARQ processes comprises: determining a first timing indicator for a first HARQ process of the plurality of HARQ processes and a second timing indicator for a second HARQ process of the plurality of HARQ processes; determining whether the first and second HARQ processes share an initial HARQ feedback transmission occasion based on the first and second timing indicators; and in response to determining that the first and second HARQ processes share the initial HARQ feedback transmission occasion, grouping the first and second HARQ processes into a first HARQ group.
  • grouping the plurality of HARQ processes comprises: determining whether a first downlink grant associated with a third HARQ process of the plurality of HARQ processes and a second downlink grant associated with a fourth HARQ process of the plurality of HARQ processes are transmitted in a single control resource set; and in response to determining that the first and second downlink grants are transmitted in a single control resource set, grouping the third HARQ process and the fourth HARQ process into a second HARQ group of the at least one HARQ group.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the method 300 further comprises: transmitting to the terminal device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a fifth HARQ process of the plurality of HARQ processes, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the fifth HARQ process is grouped.
  • the method 300 further comprises: transmitting to the terminal device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a sixth HARQ process of the plurality of HARQ processes, the sixth HARQ process associated with the further downlink transmission, and an index of the sixth HARQ process in a further HARQ group into which the sixth HARQ process is grouped.
  • transmitting the first signaling comprises: in response to a failure of reception of a HARQ feedback for the sixth HARQ process, transmitting the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the sixth HARQ process.
  • Fig. 4 is a flowchart of a method 400 for HARQ feedback transmission in accordance with some embodiments of the present disclosure.
  • the method 400 can be implemented at the terminal device 120 as shown in Fig. 1. It is to be understood that the method 400 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the terminal device 120 receives from the network device 110 a first signaling for triggering transmission of at least one HARQ feedback for at least one HARQ process.
  • the first signaling comprises an indication for at least one HARQ group.
  • the terminal device 120 determines whether the indication indicates one or more HARQ groups into which the at least one HARQ process is grouped.
  • the terminal device 120 determines that the indication indicates the one or more HARQ groups, the terminal device 120 transmits to the network device 110 the HARQ feedback.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the method 400 further comprises: receiving from the network device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a HARQ process of the at least one HARQ process, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the HARQ process is grouped.
  • determining whether the indication indicates the one or more HARQ groups comprises: determining whether the indication for the at least one HARQ group in the first signaling is identical to the indication for the HARQ group.
  • determining whether the indication indicates the one or more HARQ groups comprises: determining an initial HARQ feedback transmission occasion for a second HARQ process of the at least one HARQ process based on a timing indicator for the second HARQ process received from the network device; determining, based on the initial HARQ feedback transmission occasion, a HARQ group into which the second HARQ process is grouped; and determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • determining whether the indication indicates the one or more HARQ group comprises: determining, based on a control resource set, a HARQ group into which a third HARQ process of the at least one HARQ process is grouped, a downlink grant associated with the third HARQ process being transmitted on the control resource set; and determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • the method 400 further comprises: receiving from the network device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a fourth HARQ process of the at least one HARQ process, the fourth HARQ process associated with the further downlink transmission, and an index of the fourth HARQ process in a further HARQ group into which the fourth HARQ process is grouped.
  • receiving the first signaling comprises: receiving the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the fourth HARQ process.
  • an apparatus capable of performing the method 300 may comprise means for performing the respective steps of the method 300.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for grouping a plurality of Hybrid Automatic Repeat Request, HARQ, processes for a terminal device into at least one HARQ group.
  • the apparatus also comprises means for transmitting to the terminal device, in response to a failure of reception of a HARQ feedback for a HARQ process in the at least one HARQ group, a first signaling for triggering transmission of the HARQ feedback, the first signaling comprising an indication for the at least one HARQ group.
  • means for grouping the plurality of HARQ processes comprises: means for determining a first timing indicator for a first HARQ process of the plurality of HARQ processes and a second timing indicator for a second HARQ process of the plurality of HARQ processes; means for determining whether the first and second HARQ processes share an initial HARQ feedback transmission occasion based on the first and second timing indicators; and means for grouping the first and second HARQ processes into a first HARQ group in response to determining that the first and second HARQ processes share the initial HARQ feedback transmission occasion.
  • means for grouping the plurality of HARQ processes comprises: means for determining whether a first downlink grant associated with a third HARQ process of the plurality of HARQ processes and a second downlink grant associated with a fourth HARQ process of the plurality of HARQ processes are transmitted in a single control resource set; and means for grouping the third HARQ process and the fourth HARQ process into a second HARQ group of the at least one HARQ group in response to determining that the first and second downlink grants are transmitted in a single control resource set.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the apparatus further comprises: means for transmitting to the terminal device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a fifth HARQ process of the plurality of HARQ processes, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the fifth HARQ process is grouped.
  • the apparatus further comprises: means for transmitting to the terminal device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a sixth HARQ process of the plurality of HARQ processes, the sixth HARQ process associated with the further downlink transmission, and an index of the sixth HARQ process in a further HARQ group into which the sixth HARQ process is grouped.
  • means for transmitting the first signaling comprises: means for transmitting, in response to a failure of reception of a HARQ feedback for the sixth HARQ process, the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the sixth HARQ process.
  • an apparatus capable of performing the method 400 may comprise means for performing the respective steps of the method 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for receiving from a network device a first signaling for triggering transmission of at least one Hybrid Automatic Repeat Request, HARQ, feedback for at least one HARQ process, the first signaling comprising an indication for at least one HARQ group.
  • the apparatus also comprises means for determining whether the indication indicates one or more HARQ groups into which the at least one HARQ process is grouped.
  • the apparatus also comprises means for transmitting to the network device the HARQ feedback in response to determining that the indication indicates the one or more HARQ groups.
  • the indication for the at least one HARQ group comprises at least one of the following: an identity of the at least one HARQ group, and a bitmap, bits in the bitmap associated with the at least one HARQ group.
  • the apparatus further comprises: means for receiving from the network device a second signaling for scheduling downlink transmission, the second signaling comprising: an identity of a HARQ process of the at least one HARQ process, the fifth HARQ process associated with the downlink transmission, and an indication for a HARQ group into which the HARQ process is grouped.
  • means for determining whether the indication indicates the one or more HARQ groups comprises: means for determining whether the indication for the at least one HARQ group in the first signaling is identical to the indication for the HARQ group.
  • means for determining whether the indication indicates the one or more HARQ groups comprises: means for determining an initial HARQ feedback transmission occasion for a second HARQ process of the at least one HARQ process based on a timing indicator for the second HARQ process received from the network device; means for determining, based on the initial HARQ feedback transmission occasion, a HARQ group into which the second HARQ process is grouped; and means for determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • means for determining whether the indication indicates the one or more HARQ group comprises: means for determining, based on a control resource set, a HARQ group into which a third HARQ process of the at least one HARQ process is grouped, a downlink grant associated with the third HARQ process being transmitted on the control resource set; and means for determining whether the indication for the at least one HARQ group in the first signaling indicates the HARQ group.
  • the apparatus further comprises: means for receiving from the network device a third signaling for scheduling further downlink transmission, the third signaling comprising: an identity of a fourth HARQ process of the at least one HARQ process, the fourth HARQ process associated with the further downlink transmission, and an index of the fourth HARQ process in a further HARQ group into which the fourth HARQ process is grouped.
  • means for receiving the first signaling comprises: means for receiving the first signaling comprising an indication for the further HARQ group and a further bitmap, a bit in the further bitmap associated with the index of the fourth HARQ process.
  • Fig. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 can be considered as a further example implementation of the network device 101 as shown in Fig. 1. Accordingly, the device 500 can be implemented at or as at least a part of the network device 110 or the terminal device 120.
  • the device 500 includes a processor 510, a memory 520 coupled to the processor 510, a suitable transmitter (TX) and receiver (RX) 540 coupled to the processor 510, and a communication interface coupled to the TX/RX 540.
  • the memory 520 stores at least a part of a program 530.
  • the TX/RX 540 is for bidirectional communications.
  • the TX/RX 540 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and UE.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and UE.
  • the program 530 is assumed to include program instructions that, when executed by the associated processor 510, enable the device 500 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Figs. 1 to 10.
  • the embodiments herein may be implemented by computer software executable by the processor 510 of the device 500, or by hardware, or by a combination of software and hardware.
  • the processor 510 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 510 and memory 520 may form processing means 550 adapted to implement various embodiments of the present disclosure.
  • the memory 520 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 520 is shown in the device 500, there may be several physically distinct memory modules in the device 500.
  • the processor 510 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods 300, 400 as described above with reference to Figs. 3 and 4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable media.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon certains modes de réalisation, la présente invention concerne un procédé, un dispositif et un support lisible par ordinateur pour la transmission d'une rétroaction HARQ. Dans des exemples de modes de réalisation, le procédé comprend le regroupement, au niveau d'un dispositif de réseau, d'une pluralité de processus HARQ pour un dispositif terminal en au moins un groupe HARQ ; et en réponse à un échec de réception d'une rétroaction HARQ pour un processus HARQ du ou des groupes HARQ, la transmission, au dispositif terminal, d'une première signalisation pour déclencher la transmission de la rétroaction HARQ, la première signalisation comprenant une indication pour le ou les groupes HARQ.
PCT/CN2018/099686 2018-08-09 2018-08-09 Transmission de rétroaction harq WO2020029189A1 (fr)

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PCT/CN2018/099686 WO2020029189A1 (fr) 2018-08-09 2018-08-09 Transmission de rétroaction harq
TW108128338A TWI727385B (zh) 2018-08-09 2019-08-08 混成自動重送請求(harq)回饋傳輸技術

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