CN108809534B - Scheduling method, HARQ-ACK feedback method and corresponding equipment - Google Patents

Scheduling method, HARQ-ACK feedback method and corresponding equipment Download PDF

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CN108809534B
CN108809534B CN201710816832.4A CN201710816832A CN108809534B CN 108809534 B CN108809534 B CN 108809534B CN 201710816832 A CN201710816832 A CN 201710816832A CN 108809534 B CN108809534 B CN 108809534B
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cbg
cbgs
ack
scheduled
harq
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CN108809534A (en
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王轶
李迎阳
张世昌
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority to CN202210663807.8A priority Critical patent/CN114826490A/en
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to EP18793969.9A priority patent/EP3635898A4/en
Priority to US16/611,115 priority patent/US11219049B2/en
Priority to EP23152657.5A priority patent/EP4191920A1/en
Priority to RU2019139378A priority patent/RU2746224C1/en
Priority to PCT/KR2018/004801 priority patent/WO2018203612A1/en
Priority to KR1020197032690A priority patent/KR102499381B1/en
Publication of CN108809534A publication Critical patent/CN108809534A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • 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
    • H04L1/1887—Scheduling and prioritising arrangements
    • 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
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes
    • 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
    • H04L1/1621—Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
    • 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • 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
    • H04L1/1835—Buffer management
    • 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
    • H04L1/1861—Physical mapping arrangements
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present disclosure proposes a method of scheduling downlink transmissions performed at a network node and a corresponding network node. The method comprises the following steps: determining a maximum number of Coded Block Groups (CBGs) that can be partitioned in each TB of a downlink transmission to be transmitted according to a number of scheduled Transport Blocks (TBs) in the downlink transmission and the maximum number of CBGs that can be partitioned in the downlink transmission; determining a CBG configuration of scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission; and transmitting downlink control signaling indicating the CBG configuration. Furthermore, the present disclosure also proposes a method and a corresponding user equipment for feeding back a hybrid automatic repeat request acknowledgement (HARQ-ACK), performed at the User Equipment (UE), and a communication system comprising the above network node and the user equipment.

Description

Scheduling method, HARQ-ACK feedback method and corresponding equipment
Technical Field
The present disclosure relates to the field of mobile communications technologies, and in particular, to a downlink transmission scheduling method and a corresponding network node, a HARQ-ACK (hybrid automatic repeat request-acknowledgement) feedback method and a corresponding user equipment, and a corresponding computer-readable storage medium and a communication system including a network node and a user equipment.
Background
With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (Internet of Things or IoT for short), the future mobile communication technology is challenged unprecedentedly. To address this unprecedented challenge, the communications industry and academia have developed an extensive fifth generation (5G) mobile communications technology research directed to 2020. Work on the first phase of 5G has been underway according to the work program of the 3GPP (third generation partnership project) organization.
To support more flexible scheduling, 3GPP decides to support variable HARQ-ACK feedback delay in 5G. In a 5G system, whether FDD (Frequency Division Duplex or Frequency Division Duplex) or TDD (Time Division Duplex or Time Division Duplex) systems, for a certain downlink (also sometimes referred to herein simply as "downlink") Time unit (also sometimes referred to as a Time resource, e.g., a downlink timeslot or a downlink mini-timeslot), the uplink (also sometimes referred to herein simply as "uplink") Time unit available for feeding back HARQ-ACK is variable. For example, the time delay of HARQ-ACK feedback may be dynamically indicated through physical layer signaling, or different HARQ-ACK time delays may be determined according to different services or user equipment capabilities and other factors. Therefore, even in an FDD system, it may occur that HARQ-ACKs for downlink data transmission in a plurality of downlink time units are fed back in one uplink time unit.
In addition, considering that the size of a transport Block (Tranport Block or abbreviated TB) in a 5G system is further increased and in order to better support coexistence of different traffic types, for example, PDSCH (physical downlink shared channel) of (puncuture) partial eMBB (enhanced mobile broadband) traffic is knocked out for transmitting URLLC (ultra-reliable and low-latency communication), 3GPP decides to further refine the granularity of scheduling in 5G, and extends scheduling in units of coding blocks (Code Block or abbreviated CB)/coding Block groups (CB Group or abbreviated CBG) from scheduling in units of TB of LTE. Scheduling with CB/CBG granularity is mainly applicable for retransmissions.
The 5G system also still supports MIMO (multiple input multiple output) transmission. When operating in MIMO transmission mode, multiple TBs may be scheduled simultaneously on one downlink time unit of one carrier. For example, for initial transmission, when the number of layers (layers) of MIMO transmission is less than or equal to 4, only 1 TB is scheduled. When the number of layers is greater than 4, 2 TBs are scheduled. Or for retransmission, it is possible to schedule 2 TBs even if the number of layers is less than or equal to 4. Of course, the number of TBs actually scheduled by the base station at a time is dynamically variable.
Furthermore, in order to flexibly utilize various spectrum resources, 5G still supports carrier aggregation. That is, the base station may configure multiple carriers for one UE (User Equipment or User Equipment).
It is easy to see that in 5G systems, both from the downlink scheduling point of view and from the uplink feedback HARQ-ACK point of view, the dimensionality is increased compared to LTE. Therefore, how to design downlink scheduling signaling and how to design a HARQ-ACK feedback mechanism makes the uplink and downlink control signaling overhead reasonable, and does not affect the scheduling flexibility, and a new scheme is urgently needed.
Disclosure of Invention
To at least partially solve or mitigate the above-mentioned problems, embodiments of the present disclosure propose a downlink transmission scheduling method and a network node, a HARQ-ACK feedback method and a user equipment, and a corresponding computer-readable storage medium and a communication system.
According to a first aspect of the present disclosure, a method performed at a network node of scheduling downlink transmissions is presented. The method comprises the following steps: determining a maximum number of Coding Block Groups (CBGs) that can be partitioned in each TB of a downlink transmission to be transmitted according to a number of Transport Blocks (TBs) that can be scheduled in the downlink transmission and the maximum number of CBGs that can be partitioned in the downlink transmission; determining a CBG configuration of scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission; and transmitting downlink control signaling indicating the CBG configuration.
In some embodiments, the maximum number of CBGs that can be partitioned in the downlink transmission is configured by higher layer signaling and does not vary with the number of TBs that can be scheduled in the downlink transmission. In some embodiments, the number of TBs that can be scheduled in the downlink transmission is configured by higher layer signaling, e.g., the transmission mode that the base station configures for a scheduled TB1 is different from the transmission mode that the scheduled TB2 is configured. The number of schedulable TBs here can be understood as the maximum schedulable number of TBs. It can be seen that this number varies semi-statically. For the transmission mode with the scheduled TB of 2, the base station may set the number of schedulable TBs to 1 or 2 in the actual scheduling. In some embodiments, the number of TBs that can be scheduled in the downlink transmission is indicated by physical layer signaling, e.g., the base station configures a transmission mode with a maximum of 2 schedulable TBs, and indicates by physical layer signaling (DCI) whether the number of TBs that can be scheduled at each time is 1 or 2. The number of TBs that can be scheduled here can be understood as the number of TBs that are actually scheduled. It is readily apparent that this is a dynamically changing process. Note that for scheduling in special cases, such as the scheduling of DCI1A for backoff in LTE system, if the number of CBGs is determined, it does not fall within the scope of the present invention. With this fallback situation, the TB is no longer subdivided into CBGs but handled according to TB-based scheduling. In some embodiments, the step of determining the maximum number of CBGs that can be partitioned in each TB of the downlink transmission based on the number of transport blocks, TBs, that can be scheduled in the downlink transmission to be transmitted and the maximum number of coding block groups, CBGs, that can be partitioned in the downlink transmission comprises at least one of: determining a maximum number of CBGs that can be partitioned in the one TB to be equal to a maximum number of CBGs that can be partitioned in the downlink transmission if the downlink transmission is only one TB at most; determining a maximum number of CBGs that can be partitioned in the one TB to be equal to a maximum number of CBGs that can be partitioned in the downlink transmission if the downlink transmission actually schedules the one TB; if one TB is actually scheduled by the downlink transmission and is initially transmitted, determining the maximum number of the CBGs which can be divided in the TB as equal to the maximum number of the CBGs which can be divided in the downlink transmission, and the maximum number of the CBGs which can be divided in the TB is unchanged during retransmission of the TB; determining the maximum number of separable CBGs of the two TBs, if the downlink transmission can schedule at most two TBs, respectively, so that the sum of the maximum number of separable CBGs of the two TBs, respectively, is equal to the maximum number of separable CBGs in the downlink transmission, and the maximum number of separable CBGs of the two TBs, respectively, is equal to or differs by 1; determining the maximum number of separable CBGs of the two TBs, respectively, if the downlink transmission actually schedules the two TBs, such that the sum of the maximum number of separable CBGs of the two TBs, respectively, is equal to the maximum number of separable CBGs in the downlink transmission, and the maximum number of separable CBGs of the two TBs, respectively, is equal to or differs by 1; if the downlink transmission actually schedules two TBs, respectively determining the maximum number of the CBGs that can be divided of the two TBs, so that the sum of the maximum number of the CBGs that can be divided of the two TBs is equal to the maximum number of the CBGs that can be divided in the downlink transmission, and the maximum number of the CBGs that can be divided of the two TBs is equal to or different by 1, and if the downlink transmission schedules only 1 of the TBs at the time of retransmission, the maximum number of the CBGs that can be divided of the TB is the same as the maximum number of the CBGs that can be divided of the TB when 2 TBs are scheduled simultaneously before.
In some embodiments, the step of determining the CBG configuration of the scheduled CBG in the respective TB based on the maximum number of CBGs that can be partitioned in each TB of the downlink transmission comprises: determining a CBG configuration of CBGs that can be scheduled in a respective TB such that a number of CBGs scheduled in the respective TB is less than or equal to a maximum number of CBGs that can be partitioned in the respective TB. The step of determining a CBG configuration for scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission comprises: for each TB, determining a maximum virtual CBG number for the respective TB according to a maximum number of CBGs that can be partitioned in the downlink transmission; determining the number of virtual CBGs for the respective TB according to the size of the respective TB and the maximum number of virtual CBGs for the respective TB; and mapping the virtual CBGs to actual CBGs to determine the CBG configuration such that the number of actual CBGs does not exceed a maximum number of CBGs that can be partitioned in a respective TB. In some embodiments, the determining the CBG configuration of the scheduled CBG in the respective TB based on the maximum number of CBGs that can be partitioned in each TB of the downlink transmission comprises: for each TB, determining the number of actually scheduled CBGs according to the size of the corresponding TB and the maximum number of CBGs that can be partitioned in the corresponding TB, and further determining the CBG configuration. In some embodiments, the downlink control signaling indicating the CBG configuration comprises at least one of: a separate field for each CBG to indicate whether the respective CBG is scheduled; the independent field aiming at each CBG or the independent fields corresponding to a plurality of CBGs is used for indicating whether the HARQ buffer of the corresponding CBG needs to be emptied; a first type downlink assignment index, DAI; and a second type of DAI. In some embodiments, the first type of DAI is used to indicate one of: the sum of the number of the scheduled CBGs to the currently scheduled downlink time unit and the current carrier within the HARQ-ACK feedback binding window; within the HARQ-ACK feedback binding window, the sum of the number of the scheduled CBGs to the latest downlink time unit and/or carrier before the current scheduled downlink time unit and/or current carrier is + 1; in the HARQ-ACK feedback binding window, the sum of the number of the maximum CBGs of the scheduled downlink time unit and/or the downlink carrier till the current scheduled downlink time unit and the current carrier; and in the HARQ-ACK feedback binding window, the sum of the maximum CBG number of the scheduled downlink time unit and/or the downlink carrier wave to the latest downlink time unit and/or the latest carrier wave before the current scheduled downlink time unit and/or the current carrier wave is + 1. In some embodiments, the second type of DAI is used to indicate one of: the total number of bits of the HARQ-ACK codebook; the total number of scheduled CBGs of all scheduled carriers from a first downlink time unit to a current downlink time unit in all scheduled downlink time units within a HARQ-ACK feedback bundling window; and the total number of the maximum CBGs of all scheduled carriers from the first downlink time unit to the current downlink time unit in all the scheduled downlink time units in the HARQ-ACK feedback bundling window. In some embodiments, the downlink transmission is a physical downlink shared channel, PDSCH, transmission.
According to a second aspect of the present disclosure, a network node for scheduling downlink transmissions is presented. The network node comprises: a maximum number of Coding Block Groups (CBGs) determination unit for determining a maximum number of Coding Block Groups (CBGs) that can be partitioned in each TB of a downlink transmission to be transmitted, based on a number of Transport Blocks (TBs) that can be scheduled in the downlink transmission and the maximum number of CBGs that can be partitioned in the downlink transmission; a CBG configuration determining unit for determining a CBG configuration of scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission; and a control signaling sending unit, configured to send downlink control signaling indicating the CBG configuration.
According to a third aspect of the present disclosure, a network node for scheduling downlink transmissions is presented. The network node comprises: a processor; a memory storing instructions that, when executed by the processor, cause the processor to: determining a maximum number of Coding Block Groups (CBGs) that can be partitioned in each TB of a downlink transmission to be transmitted according to a number of Transport Blocks (TBs) that can be scheduled in the downlink transmission and the maximum number of CBGs that can be partitioned in the downlink transmission; determining a CBG configuration of scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission; and transmitting downlink control signaling indicating the CBG configuration.
According to a fourth aspect of the present disclosure, a computer-readable storage medium storing instructions that, when executed by a processor, enable the processor to perform the method according to the first aspect of the present disclosure is presented.
According to a fifth aspect of the present disclosure, a method performed at a User Equipment (UE) for feeding back a hybrid automatic repeat request acknowledgement (HARQ-ACK) is presented. The method comprises the following steps: receiving downlink control signaling; generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission; and feeding back HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook.
In some embodiments, the downlink control signaling is a downlink control indicator, DCI, and/or higher layer signaling received from a network node. In some embodiments, the downlink control signaling comprises at least one of: a first type downlink assignment index, DAI; a second type of DAI; information for determining a number of transport blocks on which to feed back the HARQ-ACK; the maximum number of coding block groups CBG that can be partitioned in the transport block TB; and whether HARQ-ACK feedback is subjected to spatial dimension bundling. In some embodiments, in the same uplink transmission, in case the number of transport blocks with at least one carrier that can be scheduled to feed back HARQ-ACKs is larger than 1: if the downlink control signaling indicates that spatial dimension bundling is not performed, the number of transport blocks on which HARQ-ACK is fed back is equal to 2; the number of transport blocks on which the feedback HARQ-ACK is based is equal to 1 if the downlink control signaling indicates spatial dimension bundling. In some embodiments, the bit length of the ACK/negative acknowledgement, NACK, for the downlink transmission is: the product of the maximum number of CBGs that can be partitioned in the TB and the number of transport blocks on which the feedback HARQ-ACK is based; the product of the number of CBGs actually scheduled by the reference transport block and the number of transport blocks on which HARQ-ACK feedback is based. In some embodiments, the reference transport block is the transport block with the largest number of CBGs actually scheduled. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: and according to the second class of DAI of the downlink control signaling, determining the bit length of the HARQ-ACK codebook as the product of the value of the second class of DAI and the number of transmission blocks on which the HARQ-ACK is fed back. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: and determining the starting point of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook according to the first type DAI of the downlink control signaling. In some embodiments, the step of determining, from the first type of DAI of the downlink control signaling, a starting point of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook comprises one of: determining a starting point of a bit position of ACK/NACK bits of the downlink transmission in the HARQ-ACK codebook as a first type DAI of the downlink control signaling; determining a starting point of a bit position of the ACK/NACK bits of the downlink transmission in the HARQ-ACK codebook as a first type DAI of the downlink control signaling minus an ACK/NACK bit length of the downlink transmission plus 1; determining the starting point of the bit position of the ACK/NACK bit of the downlink transmission in the HARQ-ACK codebook as the product of the first type DAI of the downlink control signaling and the number of transmission blocks on which the HARQ-ACK is fed back, and subtracting 1; and determining the starting point of the bit position of the ACK/NACK bit of the downlink transmission in the HARQ-ACK codebook as the product of the first type DAI of the downlink control signaling and the number of the transmission blocks on which the HARQ-ACK is fed back, minus the ACK/NACK bit length of the downlink transmission plus 1. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: and determining the ACK/NACK bit length of the downlink transmission as the maximum number of CBGs which can be segmented in the TBs multiplied by the number of transport blocks on which the HARQ-ACK is fed back, wherein the ACK/NACK bit of the scheduled CBG in the scheduled TBs is generated according to the CRC check result of the actually scheduled CBG, and the ACK/NACK bit of the unscheduled CBG is a space bit, wherein the ACK/NACK bit of the unscheduled TBs is a space bit. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: determining an ACK/NACK bit length of the downlink transmission as a product of the number of CBGs actually scheduled by the reference transport block and the number of transport blocks on which HARQ-ACK feedback is based, wherein the ACK/NACK bit of the reference transport block is generated according to a CRC check result of the CBGs actually scheduled, and the ACK/NACK bit of the non-reference transport block is generated according to a CRC check result of the CBGs actually scheduled by the non-reference transport block, and additionally generating a placeholder bit such that the ACK/NACK bit length of the non-reference transport block is equal to the number of CBGs actually scheduled by the reference transport block. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: when the downlink control signaling indicates spatial dimension binding, determining the length of ACK/NACK bits of the downlink transmission as the maximum number of CBGs that TBs can partition, wherein the ACK/NACK bits are obtained by logically AND-ing the scheduled CBGs in the respective TBs and the ACK/NACKs having the same CBG index. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: if all CBGs of one TB are scheduled by the downlink transmission, if the CRC check of all CBGs is determined to be correct: and if the CRC of the TB is incorrect, setting the ACK/NACK of all the CBGs as NACK, and if the CRC of the TB is correct, setting the ACK/NACK of all the CBGs as ACK. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: if the downlink transmission does not schedule all CBGs of a TB and the CRC check of all CBGs of the TB is correct by the current scheduling time, but the CRC check of the TB is incorrect, determining the value of ACK/NACK according to at least one of: feeding back NACKs for all CBGs; taking the ACK/NACK bit of the CBG which has fed back the ACK and is not scheduled in the current scheduling as NACK; and taking the ACK/NACK bit value of the CBG which has fed back the ACK and is not scheduled in the current scheduling as the opposite value of the predefined occupancy bit. In some embodiments, generating a HARQ-ACK codebook based on the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission comprises: feeding back both ACK/NACK for CBGs segmented by the downlink transmission and HARQ-ACK for corresponding TBs of the downlink transmission. In some embodiments, the downlink transmission is a physical downlink shared channel, PDSCH, transmission.
According to a sixth aspect of the present disclosure, a User Equipment (UE) for feeding back a hybrid automatic repeat request acknowledgement (HARQ-ACK) is presented. The UE comprises: a control signaling receiving unit, configured to receive downlink control signaling; a codebook generating unit configured to generate a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission; and a feedback unit for feeding back HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook.
According to a seventh aspect of the present disclosure, a User Equipment (UE) for feeding back a hybrid automatic repeat request acknowledgement (HARQ-ACK) is presented. The UE comprises: a processor; a memory storing instructions that, when executed by the processor, cause the processor to: receiving downlink control signaling; generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in a downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission; and feeding back HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook.
According to an eighth aspect of the present disclosure, a computer-readable storage medium storing instructions that, when executed by a processor, enable the processor to perform the method according to the fifth aspect of the present disclosure is presented.
According to a ninth aspect of the present disclosure, a communication system is presented. The communication system includes: a network node according to the second or third aspect of the present disclosure; and one or more User Equipments (UEs) according to the sixth or seventh aspects of the present disclosure.
By adopting the scheme of the embodiment of the disclosure, the HARQ-ACK feedback overhead can be effectively reduced when CBG transmission is adopted, and the misinterpretation of the HARQ-ACK codebook (sometimes also called codebook) size by a base station (network node) and UE can be avoided. Especially when the CBG transmission is adopted and the MIMO mode is operated, the embodiment of the disclosure effectively reduces the overhead of a downlink control channel and an uplink channel for bearing HARQ-ACK feedback.
Drawings
These and/or other aspects and advantages of the present disclosure will become apparent and more readily appreciated from the following description of the particular embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flow diagram illustrating an example method for scheduling downlink transmissions in accordance with an embodiment of the present disclosure.
Fig. 2 is a flow chart illustrating an example method for feeding back HARQ-ACK/NACK according to an embodiment of the present disclosure.
FIG. 3 is a schematic diagram illustrating the generation of a virtual CBG and an actual CBG according to one embodiment of the present disclosure.
FIG. 4 is a schematic diagram illustrating the generation of an actual CBG according to another embodiment of the present disclosure.
Fig. 5 is a diagram illustrating feeding back HARQ-ACKs according to one embodiment of the present disclosure.
Fig. 6 is another diagram illustrating feeding back HARQ-ACKs according to one embodiment of the present disclosure.
Fig. 7 is a diagram illustrating feeding back HARQ-ACKs according to another embodiment of the present disclosure.
Fig. 8 is another diagram illustrating feeding back HARQ-ACKs according to another embodiment of the present disclosure.
Fig. 9 is another diagram illustrating feeding back HARQ-ACKs according to another embodiment of the present disclosure.
Fig. 10 is another diagram illustrating feeding back HARQ-ACKs according to another embodiment of the present disclosure.
Fig. 11 is another diagram illustrating feeding back HARQ-ACKs according to another embodiment of the present disclosure.
Fig. 12 is a block diagram illustrating an example hardware arrangement of an example network node and/or user equipment according to an embodiment of the present disclosure.
Detailed Description
In the following detailed description of the preferred embodiments of the present disclosure, reference is made to the accompanying drawings, in which details and functions that are not necessary for the disclosure are omitted so as not to obscure the understanding of the present disclosure. In this specification, the various embodiments described below which are used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the present disclosure as defined by the claims and their equivalents. The following description includes various specific details to aid understanding, but such details are to be regarded as illustrative only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Moreover, descriptions of well-known functions and constructions are omitted for clarity and conciseness. Further, throughout the drawings, the same reference numerals are used for the same or similar functions and operations. Furthermore, all or a portion of the functions, features, units, modules, etc. described in the various embodiments described below can be combined, deleted and/or modified to form new embodiments, and still fall within the scope of the present disclosure. Furthermore, in the present disclosure, the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation.
Hereinafter, although various aspects according to embodiments of the present disclosure are described in detail by taking "Base Station (BS) or simply referred to as" BS "and" User Equipment (UE) or simply referred to as "as examples, the present disclosure is not limited thereto. Indeed, the present disclosure is applicable to any known or future developed wireless communication standard, including (but not limited to): 2G, 3G, 4G, 5G, etc. For example, herein, a base station may actually include (but is not limited to): a Base Transceiver Station (BTS), a Radio Base Station (RBS), a node b (node b), an evolved node b (enodeb), a Relay Station (Relay Station), a Transmission Point (Transmission Point), and the like. Thus, in this document, without explicit mention to the contrary, the term "base station" may be used interchangeably with the generic term "network node" including the foregoing to indicate that it is a network-side node capable of providing the same or similar functionality as a base station. Further, herein, the user equipment may actually also include concepts (but not limited to) of the following terms: user devices (User devices), Mobile stations (Mobile Station), Mobile terminals, smart phones, tablet computers, and the like.
An example method for scheduling downlink transmissions according to embodiments of the present disclosure will first be described in detail below in conjunction with fig. 1 and other figures. Fig. 1 is a flow diagram illustrating an example method 100 for scheduling downlink transmissions in accordance with an embodiment of the disclosure.
In the embodiment shown in fig. 1, the base station may generally configure a carrier (e.g., hereinafter carrier C) before the method 100 beginsi) Whether the scheduling mode of (1) is TB-based scheduling or CBG-based scheduling. If configured for CBG based scheduling, the base station may also configure the maximum number of CBGs that can be scheduled, e.g., set to Nmax_CBG. The base station, when configuring this value, may display the maximum number of CBGs configured to be schedulable. Furthermore, in other embodiments, the maximum number of CBGs that can be scheduled may also be implicitly indicated by configuring the maximum data for each scheduling of the feedbackable HARQ-ACK bits. For convenience of description, the description is made herein in terms of the maximum number of CBGs configured to be schedulable, however, it should be understood by those skilled in the art that the present disclosure is not limited thereto. Further, in some embodiments, the base station may also configure whether the HARQ-ACK feedback mode for its associated UE is TB-based or CBG-based granularity.
The present invention does not limit how a base station specifically divides a TB into a plurality of CBs, and further combines the plurality of CBs into a CBG, unless otherwise specified. For example, the base station determines how many CBs to divide into according to the size of TB, and then determines Nmax_CBGIt is determined how many CBGs to combine.
In some embodiments, the signaling for configuring the HARQ-ACK feedback mode may be the same signaling as for configuring the carrier scheduling mode. For example, if carrier C is to be usediConfigured to be TB based, the HARQ-ACK feedback may be implicitly configured to be TB based as well. Alternatively, in other embodiments, the signaling for configuring the HARQ-ACK feedback mode may be separately configured signaling from the signaling for configuring the carrier scheduling mode. For example, carrier C may be usediIs configured to be TB based but HARQ-ACK feedback is configured to be CBG based. Furthermore, in some embodiments, the above configuration information may be configured, in whole or in part, semi-statically for higher layer signaling. It is noted that, configured as a CBG-based scheduling/feedback mode, the base station may indicate scheduling information for each CBG, which may be displayed in the downlink control signaling DCI, or may implicitly indicate, and cause the UE to determine which CBGs are scheduled by a predefined criterion. The present disclosure is not particularly limited.
Further, in some embodiments, the base station may also configure a MIMO transmission mode (which may also be sometimes referred to as a MIMO scheduling mode). For example, transmission between the base station and the UE may be configured in SIMO (single input multiple output) or MIMO transmission mode, but the number of MIMO layers is not limited. Furthermore, in some embodiments, the transmission between the base station and the UE may also be configured as a transmission mode in which at most one TB or two TBs are transmitted.
In some embodiments, the maximum number of CBGs that can be scheduled, N, configured by the base stationmax_CBGMay represent the maximum number of CBGs that can be scheduled in one schedule. If multiple TBs are scheduled in one schedule, the total number of scheduled CBGs in all TBs does not exceed Nmax_CBG. If only one TB is scheduled in a schedule, the total number of CBGs that this TB is scheduled will not typically exceed Nmax_CBG。
In other embodiments, the maximum number of schedulable CBGs, N, configured by the base stationmax_CBGMay indicate that the total number of CBGs scheduled in one TB in one schedule does not exceed Nmax_CBG. In this case, if 2 TBs are scheduled in one schedule, the total number of scheduled CBGs in all TBs typically does not exceed 2 × Nmax_CBG. Thus, the base station can cope with the maximum CBG number Nmax_CBGWhether the total number of CBGs in one schedule or the total number of CBGs of one TB in one schedule is configured. In some embodiments, the information related to the configuration may be a higher layer signaling semi-static configuration.
In some embodiments, the configured maximum number of CBGs N may be predefined according to a standardmax_CBGIs the total number of CBGs in a schedule. In other embodiments, the maximum number of CBGs N that can be configured may be predefined according to a standardmax_CBGThe total number of CBGs for one TB in a schedule.
Next, an example method 100 of scheduling downlink transmissions according to an embodiment of the present disclosure will be described in detail in connection with steps S110-S130 shown in fig. 1.
As shown in fig. 1, the method 100 may begin at step S110. In step S110, the base station may determine the maximum number of Coded Block Groups (CBGs) that can be split in each TB of a downlink transmission to be transmitted to the UE according to the number of Transport Blocks (TBs) that can be scheduled in the downlink transmission and the maximum number of CBGs that can be split in the downlink transmission.
In some embodimentsIf carrier (e.g., carrier C)i) Is configured to schedule based on CBGs as described earlier, the base station may schedule according to the configured number of schedulable maximum TBs and the maximum number of CBGs N determined as described abovemax_CBGTo determine the maximum number of CBGs that can be scheduled in each TB Nmax_CBG_TBi. In step S110, the base station can schedule the maximum number of TBs N according to the schedulableTBAnd/or predefined criteria to determine the maximum number of CBGs N that can actually be scheduled per TBmax_CBG_TBi. In some embodiments, the predefined criteria may be:
Nmax_CBG_TBi＝Nmax_CBG/NTB。
in some embodiments, if carrier (e.g., carrier C)i) Is configured to be scheduled based on CBGs as described above, the base station may determine the maximum number of CBGs N according to the number of actually scheduled TBs and the maximum number of CBGs N determined as described abovemax_CBGTo determine the maximum number of CBGs that can be scheduled in each TB Nmax_CBG_TBi。
In some embodiments, in step S110, the maximum number N of Coded Block Groups (CBGs) that can be partitioned if in downlink transmissionmax_CBGThe total number of CBGs in one scheduling, the base station may be based on the actual number of scheduled TBs NTBAnd/or predefined criteria to determine the maximum number of CBGs N that can actually be scheduled per TBmax_CBG_TBi. In some embodiments, the predefined criteria may be:
Nmax_CBG_TBi＝Nmax_CBG/NTB。
if N is presentmax_CBGIs not NTBInteger multiple of N, N may be divided equally as much as possible in some embodimentsmax_CBGIs divided into NTBIn each TB. For example, if N max_CBG5 and N TB2, then N of the first TBmax_CBG_TB1N which may be 2 and a second TBmax_CBG_TB2N which may be 3, or the first TBmax_CBG_TB1N which may be 3 and a second TBmax_CBG_TB2May be 2.
Next, as shown in fig. 1, the method 100 may proceed to step S120. In step S120, the base station may determine a CBG configuration of scheduled CBGs in corresponding TBs based on the maximum number of CBGs that can be split in each TB of the downlink transmission.
In some embodiments, to determine the configuration of the CBG that is actually schedulable, this may be done in at least two ways. Or, by other means, according to TB size, and Nmax_CBG_TBiThe configuration of the CBG for each TB is determined.
CBG configuration mode one
In some embodiments, for each TB, the base station may pass Nmax_CBGTo determine the virtual maximum number of CBGs N for the corresponding TBvirtual_max_CBG_TBi. For example, can let Nvirtual_max_CBG_TBi＝Nmax_CBG. Then, the base station can be based on TB size and Nvirtual_max_CBG_TBiTo determine the number N of virtual CBGs scheduledvirtual_CBG_TBi. Next, the base station may map the virtual CBGs onto the actual CBGs according to a predefined manner such that the number of actually schedulable CBGs does not exceed the maximum number of actually schedulable CBGs N in the respective TBmax_CBG_TBi. In this way, the CBG configuration in each TB can be determined.
For example, as shown in the lower part of FIG. 3, if Nmax_CBGIn this scheduling, the base station schedules 2 TBs: TBaAnd TBbAnd thus N as described abovemax_CBG_TBi2. By TBaFor example, N virtual_max_CBG_TBa4 and N max_CBG_TBa2. Hypothesis TBaThe size of (2) is 50000, and can be divided into 6 CBs and 4 virtual CBGs, wherein the 1 st and 2 nd CBs constitute the 1 st virtual CBG, the 3 rd and 4 th CBs constitute the 2 nd virtual CBG, the 5 th CB constitutes the 3 rd virtual CBG, and the 6 th CB constitutes the 4 th virtual CBG. These 4 virtual CBGs may be mapped into 2 actual CBGs, then the 1 st and 2 nd virtual CBGs may be mapped into the 1 st actual CBG, and the 3 rd and 4 th virtual CBGs may be mapped into the 2 nd actual CBG. Furthermore, as understood by those skilled in the art: the above example is only one example to aid the reader's understandingIt is not excluded that there may be other predefined ways to map the 4 virtual CBGs into the 2 actual CBGs. For example, the 1 st, 3 rd virtual CBGs may be mapped to the 1 st actual CBG, and the 2 nd, 4 th virtual CBGs may be mapped to the 2 nd actual CBG, and so on.
In addition, as shown in the upper part of fig. 3, if the base station schedules only 1 TB in the current schedulingaThen is thus N max_CBG_TBi4. In this case, 4 virtual CBGs may correspond to 4 actual CBGs.
CBG configuration mode two
In other embodiments, for each TB, the base station may base on the corresponding TB size and the maximum number of CBGs N that may be actually scheduledmax_CBG_TBiTo determine the number of CBGs actually scheduled.
For example, as shown in the right side of FIG. 4, if Nmax_CBGIn this scheduling, the base station schedules 2 TBs: TBaAnd TBbAnd thus N max_CBG_TBi2. By TBaFor example, suppose TBaIs 50000 and can be divided into 6 CBs, the number of actually scheduled CBGs is 2 (since the number of CBs > 1). Wherein the 1 st, 2 nd, 3 rd CBs constitute the 1 st actual CBG, and the 4 th, 5 th, 6 th CBs constitute the 2 nd actual CBG.
For another example, as shown in the left side of fig. 4, if the base station schedules only one TB in the current scheduling, the 1 st and 2 nd CBs constitute the 1 st actual CBG, the 3 rd and 4 th CBs constitute the 2 nd actual CBG, the 5 th CB constitutes the 3 rd actual CBG, and the 6 th CB constitutes the 4 th actual CBG.
From the above description, it can be seen that "CBG configuration two" is simpler in implementation, but "CBG configuration one" is more robust in case that the UE misses DCI, and in some cases, it can also improve the efficiency of retransmission, and several examples are given below.
In some embodiments, the number of TBs scheduled by the base station per time may be different, but Nmax_CBG_TBiDoes not vary with the number of actually scheduled TBs. For example, the maximum schedulable TB number N configured by the base station through higher layer signalingTB2 if the current downlinkOnly one TB is scheduled in a transmission, N of this TBmax_CBG_TBi＝N max_CBG2 instead of Nmax_CBG_TBi＝Nmax_CBG。
In some embodiments, the number of TBs scheduled by the base station per time may be different. For example, the base station may determine N according to the number of TBs actually scheduled for this transmissionmax_CBG_TBi. So, for different TBs, N per schedulingmax_CBG_TBiMay be the same or different. For the same TB, one implementation, N, at retransmission and initial transmission (initial transmission), or at different retransmission timesmax_CBG_TBiDetermined by the number of TBs per transmission. In another implementation, for the same TB, N is used for retransmission and initial transmission (initial transmission) or different retransmission timesmax_CBG_TBiAnd keeping the transmission state unchanged, and determining the transmission state according to the TB number of the TB in the initial transmission of the TB.
For example, the base station schedules 2 TBs: TBaAnd TBbAll of which are initial transmissions. At this time, Nmax_CBG_TBa＝N max_CBG_TBb2. If of TBbSuccessful transmission, but TBaIf transmission fails, the base station only schedules TB when scheduling retransmissiona. In this case, Nmax_CBG_TBa＝4。
Scheduling the primary transmission TB at the base station according to the CBG configuration mode IaWhen, N max_CBG_TBa2, wherein CB 1-4 is actually scheduled CBG1 and CB 5-6 is actually scheduled CBG 2. Assuming that the UE fails to demodulate CBG2 but successfully demodulates CBG1, the base station is scheduling retransmission of TBaWhen the data is transmitted, the CB 5-6 is scheduled. At this time N max_CBG_TBa4. The base station indicates the CBGs scheduled at this time as CBG3 and CBG4, namely CB 5-6.
According to the CBG configuration mode II, the primary transmission TB is scheduled at the base stationaWhen N is presentmax_CBG_TBa2, wherein CB 1-3 is actually scheduled CBG1 and CB 4-6 is actually scheduled CBG 2. Assuming that the UE fails to demodulate CBG2 but successfully demodulates CBG1, the base station is scheduling retransmission of TBaWhen the data is transmitted, the CB 4-6 is scheduled. At this time N max_CBG_TBa4. CBG regrouping, i.e. where the 1 st, 2 nd CBs constitute the 1 st CBG,the 3 rd and 4 th CBs constitute the 2 nd CBG, the 5 th CB constitutes the 3 rd CBG, and the 6 th CB constitutes the 4 th CBG. To retransmit CBs 4-6, the base station indicates that the CBGs scheduled at this time are CBGs 2, 3 and 4, namely, CBs 3-6.
For another example, the base station schedules 1 TB: TBaIt is the initial transmission. At this time, N max_CBG_TBa4. If TBaIf the transmission fails, the base station schedules the retransmission of the TB and schedules an initially transmitted TBb. At this time, Nmax_CBG_TBa＝Nmax_CBG_TBb＝2。
Scheduling the primary transmission TB at the base station according to the CBG configuration mode IaWhen N is presentmax_CBG_TBaWhere 1 st, 2 nd CBs constitute the 1 st actually scheduled CBG, 3 rd, 4 th CBs constitute the 2 nd actually scheduled CBG, 5 th CB constitutes the 3 rd actually scheduled CBG, and 6 th CB constitutes the 4 th actually scheduled CBG. Suppose the UE failed to demodulate CBG2, but succeeded in demodulating CBGs 1, 3, 4. The base station schedules the retransmission TBaThe scheduling CB 3-4. At this time N max_CBG_TBa2. The base station indicates that the CBG scheduled at this time is CBG1, namely CB1 ~ 4.
According to the CBG configuration mode II, the primary transmission TB is scheduled at the base stationaWhen N is presentmax_CBG_TBaWhere 1 st, 2 nd CBs constitute the 1 st actually scheduled CBG, 3 rd, 4 th CBs constitute the 2 nd actually scheduled CBG, 5 th CB constitutes the 3 rd actually scheduled CBG, and 6 th CB constitutes the 4 th actually scheduled CBG. Suppose the UE failed to demodulate CBG2, but succeeded in demodulating CBGs 1, 3, 4. Scheduling retransmission of TBs at a base stationaWhen the data is transmitted, the CB 3-4 is scheduled. At this time N max_CBG_TBa2. CBG regrouping, i.e., where the 1 st, 2, 3 rd CBs make up the 1 st CBG and the 4 th, 5, 6 th CBs make up the 2 nd CBG. To retransmit CBs 3-4, the base station indicates that the CBG scheduled at this time is CBG1 and CBG2, i.e., all CBs.
For example, the base station schedules 2 TBs: TBaAnd TBbAll of which are initial transmissions. At this time, Nmax_CBG_TBa＝N max_CBG_TBb2. If of TBbAll CBGs transmitted successfully, but TBaWhen the base station schedules retransmission, only the TB can be scheduleda. In this case, Nmax_CBG_TBa＝2。
According to the CBG configuration mode II, the primary transmission TB is scheduled at the base stationaWhen N is presentmax_CBG_TBa2, wherein CB 1-3 is actually scheduled CBG1 and CB 4-6 is actually scheduled CBG 2. Assuming that the UE fails to demodulate CBG2 but successfully demodulates CBG1, the base station is scheduling retransmission of TBaWhen the data is transmitted, the CB 4-6 is scheduled. At this time Nmax_CBG_TBaThe base station indicates that the CBG scheduled at this time is CBG2, 2.
For another example, the base station schedules 2 TBs: TBaAnd TBbWherein TBaAnd TBbAre all initial transmissions. At this time, Nmax_CBG_TBa＝N max_CBG_TBb2. If of TBbAll CBGs transmitted successfully, but TBaWhen the base station schedules retransmission, the base station can schedule TBaRetransmission of partial CBG and TBcAnd (4) newly transmitting. In this case, Nmax_CBG_TBa＝Nmax_CBG_TBc＝2。
It is noted that it may happen that the UE misses the DCI scheduling the initial transmission of a certain TB, and thus cannot determine N at the time of initial transmissionmax_CBG_TBi. The base station may avoid this confusion by scheduling. For example, if the last transmission is 2 TBs, if the base station can determine that the received HARQ-ACK corresponding to the last transmission is DTX/DTX, the base station schedules the two TBs simultaneously when scheduling again. If the last transmission is 2 TBs, the base station may schedule only one TB or two TBs at the same time if the base station can determine that the received HARQ-ACK corresponding to the last transmission is one CBG of at least one TB as ACK.
For another example, the base station schedules 1 TB: TBaIt is the initial transmission. At this time, N max_CBG_TBa4. If of TBaAnd if the transmission fails, the base station schedules to retransmit the TB. In order to avoid the increase of the number of bits for HARQ-ACK feedback caused by simultaneously scheduling 2 TBs, one way is that the base station cannot be in the TBaBefore the transmission is successful, other TBs are scheduled. This also avoids when the UE misses the scheduled TBaDCI transmitted initially but TB retransmittedaAnd DCI of another TB, the UE has noMethod for determining N at initial transmissionmax_CBG_TBaTo a problem of (a). Alternatively, the base station may schedule other TBs, e.g., TBs, at the same timebAnd N ismax_CBG_TBa＝N max_CBG_TBb4. In order to avoid the increase of the HARQ-ACK bit, the UE automatically performs CBG dimension bundling, so that the HARQ-ACK bit number fed back by the two TBs is still 4. The detailed example section for participating in HARQ-ACK feedback.
More generally, the disclosed embodiments do not limit how the base station partitions one or more TBs into CBs, and the specific method of composing the virtual CBG.
Next, the method 100 may proceed to step S130. In step S130, the base station may transmit downlink control signaling indicating the CBG configuration determined in step S120. For example, the base station may generate DCI including CBG scheduling or configuration information bits according to the aforementioned manner and transmit the DCI to the UE through a downlink control channel (e.g., PDCCH). The DCI containing the CBG scheduling or configuration information generated by the base station may be generated in one of the following ways.
In some embodiments, the base station may indicate scheduling information separately for each TB. For example, each TB has an independent MCS (Modulation and Coding Scheme) indication, RV (redundancy Version or redundancy Version) indication, NDI (New Data Indicator or New Data Indicator), and the like. In some embodiments, the NDI may be one NDI for each TB, or may be one NDI for a CBG of each TB (or bit information with the same effect).
Further, in some embodiments, the base station may indicate scheduling or configuration information separately for the CBG of each TB. For example, one or more of the following information may be included:
(1) each CB/CBG may have an independent bit field (or sometimes referred to as a field or field) for indicating whether the corresponding CB/CBG is scheduled.
Suppose N max_CBG4, and this time scheduled NTBWhen 2, then N max_CBG_TBi2. For these 2 CBGs of each TB, there is a 1-bit field to indicateWhether the base station schedules this CBG. In some embodiments, if the 1 bit is inverted relative to the corresponding bit in the initial transmission scheduling the same TB, this CBG is not scheduled. In some embodiments, the 1 bit is unchanged relative to the corresponding bit scheduling the initial transmission of the same TB, indicating that this CBG is scheduled. In some embodiments, the 1 bit indicates that the CBG is scheduled or not scheduled according to a predefined value, 0 or 1.
And for initial transmission, this bit may not be used to indicate whether the corresponding CB/CBG is scheduled, but rather to indicate that this TB is an initial transmission. For example, when the bit of all CBGs of a TB is inverted with respect to the bit of DCI scheduling the initial transmission of the previous TB of the same HARQ process, it indicates that this TB is the initial transmission, otherwise it indicates retransmission. That is, for the initial transmission of one TB, the bits of each CBG should all be the same value and the bits are all inverted relative to the initial transmission of the previous TB scheduling the same HARQ process.
The following describes a scenario when the number of TBs of the current transmission and the current initial transmission are different:
(a) for example, the base station has only scheduled 1 new TB in the last initial transmissionaIt has 4 CBGs, but the base station schedules two new TBs in this transmission: TBbAnd TBcThen there are 2 bits for 2 CBGs for each of the two TBs, i.e. 4 bits in total. Hypothesis TBaAnd TBbCorresponding (e.g., HARQ process is the same), TB is addedb2 bits with respect to TB a4 bit inversion of (TB)cThe 2 bits of (a) are all inverted with respect to the previous TB of the same HARQ process.
(b) For example, the base station scheduled 2 new TBs in the last initial transmission: TBbAnd TBcHowever, the base station only schedules 1 new TB in the transmissionaSuppose TBaAnd TBbCorresponding (e.g., HARQ process is the same), TB is the samea4 bits of (d) relative to TB b2 bit inversion of (a).
Furthermore, in some embodiments, if the DCI also contains the NDI of the TB, each CB/CBG has a separate field for indicating only whether the corresponding CB/CBG is scheduled, and whether this TB is an initial transmission or a retransmission is indicated by the NDI of the TB.
(2) Each CB/CBG can have an independent field for explicitly indicating whether the corresponding CB/CBG needs to empty the corresponding buffer, or implicitly indicating whether the corresponding CB/CBG needs to empty the corresponding buffer by indicating whether the corresponding CB/CBG is knocked down, or each TB respectively adopts 1 bit to indicate whether the CB/CBG scheduled by the same DCI needs to empty the corresponding buffer, or a plurality of TBs share 1 bit to indicate whether the CB/CBG scheduled by the same DCI needs to empty the corresponding buffer. By inverting the field relative to the last transmission of the same TB scheduled, it can be indicated that the CB/CBG is a new CBG or a CBG that may need to empty buffers, while the field does not change to indicate that the CB/CBG is a CBG that does not need to empty buffers.
However, it should be noted that: when the buffer is emptied, if the CB contained in the current CBG is not identical to the CB contained in the CBG transmitted last time, for example, the CBs 1-4 in the buffer are the CBG1 transmitted last time, the current transmission receives a signaling instruction to empty the buffer of the CB of the CBG2, at this time, the CBG2 only contains the CBs 3-4, only the buffers of the CBs 3-4 are emptied, and the CB 1-2 is still reserved in the buffer. On the contrary, if the CBs 1-4 in the buffer are the CBG1 and the CBG2 transmitted last time, the current transmission receives a signaling instruction to empty the buffer of the CB of the CBG1, and the CBG1 at the moment contains the CBs 1-4, the buffer of the CBs 1-4 needs to be emptied.
In step S130, the DCI including the CBG scheduling/configuration information generated by the base station may further include a Downlink Assignment Index (DAI). In some embodiments, the DAIs may comprise a first type of DAI and/or a second type of DAI.
A first class of DAI, which may also be referred to as a count DAI, indicates one of:
(1) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And a current carrier (e.g., current carrier C)i) Is scheduled toOr the sum of the number of the CBGs or the sum of the number of bits of the HARQ-ACK to be fed back;
(2) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And/or a current carrier (e.g., current carrier C)i) Adding 1 to the sum of the number of the scheduled CBGs or adding 1 to the sum of the number of bits of the HARQ-ACK needing to be fed back until the last downlink time unit and/or carrier;
(3) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And a current carrier (e.g., current carrier C)i) The sum of the maximum CBGs of the scheduled downlink time unit and/or downlink carrier, or the sum of the number of bits of the HARQ-ACK to be fed back; alternatively, the first and second electrodes may be,
(4) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And/or a current carrier (e.g., current carrier C)i) Adding 1 to the sum of the maximum CBGs of the scheduled downlink time unit and/or downlink carrier or adding 1 to the sum of the bit numbers of the HARQ-ACK needing to be fed back until the last downlink time unit and/or downlink carrier.
The HARQ-ACK feedback bundling window is a set of all downlink time units and/or a set of all carriers that may simultaneously feed back HARQ-ACK/NACK in the same uplink time unit. The length of the downlink time unit is not limited in the present disclosure, and may be, for example, a downlink slot, a mini slot, or an OFDM symbol. In some embodiments, the counting of the first type of DAI may be granular in terms of the number of CBGs. If configured in TB scheduling mode, one TB may be considered to correspond to 1 CBG. When a carrier configured in the TB scheduling mode is scheduled, and the base station does not configure bundling of the spatial dimension, the number of CBGs scheduled for this carrier may be considered as a fixed value. For example, the number of CBGs scheduled for this carrier may be equal to the maximum number of TBs N supportable in MIMO mode max_TB2. Alternatively, the number of CBGs scheduled for this carrier may be equal to the number of TBs actually scheduled.
For (3) or (4) above, the maximum CBG number N of each downlink time unit and/or downlink carrier being scheduledmax_CBGMay be different. For example, the base station configures different N for different downlink carriersmax_CBG. A special case is that a TB scheduling mode is configured for some carriers, and when the base station does not configure the bundling of spatial dimensions, N of these carriers max_CBG2, if one TB is scheduled, the HARQ-ACK bit of another TB is a space occupying bit, and simultaneously, CBG scheduling modes are configured for part of carriers, but N of each carrier configured with the CBG scheduling modemax_CBGThe specific values may be different. According to the method of the invention, N is determinedmax_CBGA value of one HARQ-ACK; or, a carrier configured with a TB scheduling mode, Nmax_CBGDepending on the number of actually scheduled TBs, if only one TB is scheduled, Nmax_CBGIf 2 TBs are scheduled, N is 1max_CBG2. It will be readily seen that the first class of DAIs is granular in terms of the number of CBGs, and the count of the TB dimension is included in the count of the CBG dimension. Then, for either the TB scheduling mode or the CBG scheduling mode, whether one TB or two TBs are scheduled, the DAI of the first type calculates the number of bits of HARQ-ACK that all TBs need to feed back in each PDSCH.
When the base station configures the binding of the spatial dimension, configuring the N of the carrier waves of the TB scheduling mode max_CBG1, if 2 TBs are scheduled, performing AND operation on HARQ-ACK of the two TBs, and if 2 TBs are scheduled for a carrier configured with a CBG scheduling mode, feeding back N no matter one or two TBs are scheduled according to the method provided by the inventionmax_CBGHARQ-ACK of bits.
For example, it can be assumed that the time length of the HARQ-ACK feedback bundling window is one downlink time unit, and the frequency domain dimension has 3 carriers. All three carriers are configured to support scheduling of a maximum of 2 TBs. In a downlink time unit, the base station may schedule PDSCH on 2 carriers, where carrier 1 may be configured as CBG-based scheduling, and the maximum number N of CBGsmax_CBG_C1Carrier 2 may be configured as a TB-based scheduling, and Nmax_CBG_C2＝N max_TB2. In addition, carrier 3 may be configured as CBG-based scheduling, and the maximum number of CBGs N max_CBG_C36. Suppose that: carrier 1 schedules 2 TBs, and the total number of CBGs scheduled by 2 TBs is 3; and carrier 3 schedules 1 TB, the total number of scheduled CBGs is 6. Then, as shown in fig. 5, according to the method (1), the DAI of carrier 1 is 3, which means that carrier 1 schedules 3 CBGs, and the DAI of carrier 3 is 9, which means that carrier 1 to carrier 3 schedule 9 CBGs in total. The UE may find that the base station does not schedule carrier 2 when it receives the first type DAI for carrier 3. According to the method of (4), the first class DAI of carrier 1 is 1, which indicates that carrier 1 is the first scheduled carrier, and the first class DAI of carrier 3 is 5, which indicates carriers 1 to 2, and the sum of the maximum CBG numbers corresponding to the carriers actually scheduled by the base station is 4. The UE may find that the base station does not schedule carrier 2 when it receives the first type DAI for carrier 3.
For another example, it may be assumed that carrier 1 schedules 2 TBs, the total number of CBGs scheduled by the 2 TBs is 3, carrier 2 schedules 1 TB and carrier 3 schedules 1 TB, and the total number of scheduled CBGs is 6. Then, according to the method of (1), the first class DAI of carrier 1 is 3, which means that carrier 1 schedules 3 CBGs; the first class DAI of carrier 2 is 5, which means that 5 CBGs are scheduled in total for carriers 1 to 2; and the first DAI of carrier 3 is 11, which means that 11 CBGs are scheduled for carriers 1 to 3 in total. Suppose the UE receives no PDCCH for carrier 2, and receives PDCCHs for carrier 1 and carrier 3. Then, when receiving the first type DAI of carrier 3, the UE may find that the PDCCH of carrier 2 is missed, and determine that carrier 2 actually schedules at most 2 CBGs. Note that: the base station may schedule 1 TB or 2 TBs, but no matter how many TBs the base station schedules, it considers that at most 2 CBGs are scheduled.
According to the method of (4), as shown in fig. 6, the first class DAI of carrier 1 is 1, the first class DAI of carrier 2 is 5, and the first class DAI of carrier 3 is 7. Suppose the UE receives no PDCCH for carrier 2, and receives PDCCHs for carrier 1 and carrier 3. Then, the UE may find that the PDCCH of carrier 2 is missed when receiving the first type DAI of carrier 3. Assuming that the UE does not receive the PDCCH of carrier 1, the PDCCH of carrier 2 and carrier 3 is receivedWhen receiving the first type DAI of carrier 2, the UE may find that the PDCCH of carrier 1 is missed. In addition, the UE may determine that the carrier 2 only schedules 1 TB according to the PDCCH of the carrier 2, but when generating the HARQ-ACK, the UE still needs to generate HARQ-ACK of 2 TBs, where the HARQ-ACK of 1 TB determines ACK/NACK according to a decoding result of the PDSCH, and the HARQ-ACK of another TB is an occupied bit, and a value may be a fixed value, for example, a value may be NACK/DTX. Alternatively, assume N for the carrier scheduled for TBmax_CBGDetermined according to the number of scheduled TBs, then, in this example, the first class DAI of carrier 1 equals 1, the first class DAI of carrier 2 equals 5, and the first class DAI of carrier 3 is not 7, but 6. Suppose the UE receives no PDCCH for carrier 2, and receives PDCCHs for carrier 1 and carrier 3. Then the UE only needs to generate HARQ-ACK for 1 TB when generating HARQ-ACK for carrier 2.
In some embodiments, the first type of DAI may be used to calculate a currently scheduled downlink time unit (e.g., downlink time unit T)i) And a downlink carrier (e.g., downlink carrier C)i) Is at the beginning of a bit position in the HARQ-ACK codebook.
Corresponding to (2) or (4), the downlink time unit TiAnd downlink carrier CiThe start of the bit position of the ACK/NACK bit in the HARQ-ACK codebook may be equal to the corresponding DAI. In some embodiments, the downlink time unit TiAnd downlink carrier CiThe ACK/NACK bit length of (a) may be the number of CBGs scheduled (corresponding to (2)) or the maximum number of CBGs (corresponding to (4)).
Corresponding to (1) or (3), the downlink time unit TiAnd downlink carrier CiMay be equal to the corresponding DAI minus the downlink time unit TiAnd downlink carrier CiPlus 1. In some embodiments, the downstream time unit TiA downlink carrier CiThe ACK/NACK bit length of (a) may be the number of CBGs scheduled (corresponding to (1)) or the maximum number of CBGs (corresponding to (3)).
In some embodiments, when the UE feeds back the downlink time unit TiAnd downlink carrier CiWhen configured in the CBG scheduling mode, the ACK/NACK of the CBG in the scheduled first TB is mapped first, and then the ACK/NACK of the CBG in the scheduled second TB (if 2 TBs are scheduled) is mapped.
In some embodiments, when mapping ACK/NACK of each CBG in a TB corresponding to (1) or (2), the ACK/NACK bits of each scheduled CBG may be mapped in sequence from small to large according to the index of the CBG actually scheduled by the TB.
In some embodiments, corresponding to (3) or (4), when mapping ACK/NACK of each CBG in one TB, ACK/NACK bits of each CBG may be mapped sequentially from small to large according to an index of the CBG of the TB, where ACK/NACK of a scheduled CBG is determined to take a value according to a decoding result of the CBG, and ACK/NACK of an unscheduled CBG is a placeholder bit and may take a predefined value. In addition, a downlink time unit TiAnd downlink carrier CiMay be N in total length of ACK/NACK bits for all TBsmax_CBG。
For the TB scheduling mode configured, corresponding to (1) - (4), ACK/NACK of a first TB may be mapped first, and then ACK/NACK of a second TB may be mapped, and the ACK/NACK of the scheduled TB is determined according to a decoding result of the TB, and the ACK/NAC of the non-scheduled TB is an placeholder bit, and may adopt a predefined value.
The second class of DAI, also called full DAI (i.e. total DAI), may indicate a total number of bits of the HARQ-ACK codebook, or a total number of scheduled CBGs of all scheduled carriers from a first downlink time unit in all scheduled downlink time units to a current downlink time unit within a HARQ-ACK feedback bundling window, or a maximum total number of CBGs of all scheduled carriers from the first downlink time unit in all scheduled downlink time units to the current downlink time unit within the HARQ-ACK feedback bundling window, or a sum of corresponding number of bits of HARQ-ACK to be fed back.
For example, in one downlink time unit, PDSCH is scheduled on 2 carriers, where carrier 1 is configured to be based on CBG scheduling, and the maximum number of CBGs Nmax_CBGCarrier 2 is configured as a TB-based scheduling. Assume that carrier 1 schedules 2 TBs and the total number of CBGs scheduled by 2 TBs is 3. If the DAI of the second type indicates the total number of scheduled CBGs from the first downlink time unit to the current downlink time unit in all the scheduled downlink time units corresponding to the given uplink time unit, then the DAI of the second type of carrier 1 and carrier 2 is 3+2, 5. If the DAI of the second type indicates the total number of the scheduled maximum CBGs from the first downlink time unit to the current downlink time unit in all the scheduled downlink time units corresponding to the given uplink time unit, the DAI of the second type of carrier 1 and carrier 2 is 4+ 2-6.
Please note that: for either the first type of DAI or the second type of DAI, it may be that one bit state corresponds to a value of multiple DAIs due to limitations in bit overhead. For example, in an LTE system, the DAI contains only 2 bits, but the actual values of the DAI that can be indicated are 1-32 or greater. In this case, a modulo form may be generally adopted, and for example, DAI ═ 00 "may indicate that DAI takes values of 1, 5, 9, …, 4 × (M-1) + 1.
Another method for determining the total bit number of the HARQ-ACK codebook can be based on the number of semi-statically configured carriers, the HARQ-ACK feedback bundling window and each semi-statically configured downlink time unit T instead of the DAIiAnd downlink carrier CiThe size and the bit arrangement order of the HARQ-ACK codebook are determined by the number of HARQ-ACK bits. In this case, the carrier configured for TB scheduling may determine the number of HARQ-ACK bits according to the maximum number of transmittable TBs, for example, if downlink carrier CiIs configured to have only 1 TB at maximum, and is 1 bit, and if it has 2 TBs at maximum, it is 2 bits regardless of how many TBs are actually scheduled. The carrier wave configured to be CBG scheduling is fixed to N no matter the number of TBmax_CBG_i。
Although the foregoing embodiments are mainly described from the perspective of a base station, for those skilled in the art, based on the foregoing description, to ensure correct reception of the UE, the UE needs to determine the received DCI according to the same or corresponding criteria and methods as the base station, and determine the DCIThe information of CBG of (1), whether it is for one TB or a plurality of TBs, and each CBG in the DCI indicates which CBG of which TB the information bit corresponds to, and how the received PDSCH is divided into CBs and combined into CBGs. For the sake of brevity, further description is omitted here. In addition, in order to ensure correct feedback of HARQ-ACK, the UE may also need to determine information of the first type and/or the second type of DAI in the received DCI according to the same or corresponding criteria and methods as the base station, determine HARQ-ACK feedback according to the information of the first type or/and the second type of DAI, or according to a predefined rule, for example, the number of HARQ-ACK bits per scheduling feedback is fixed to Nmax_CBGDetermining HARQ-ACK feedback is also not described in detail.
By using the scheme according to the above embodiments, the length of DCI in each scheduling does not change with the number of scheduled TBs, and the complexity of blind detection of PDCCH by UE is reduced. In addition, when the UE performs HARQ-ACK feedback, the bit number of HARQ-ACK corresponding to the PDSCH scheduled every time is not changed along with the number of the scheduled TBs, so that the HARQ-ACK feedback overhead is saved. In addition, the problem that when HARQ-ACK of PDSCHs of a plurality of carriers or HARQ-ACK of PDSCHs of a plurality of downlink time units are fed back in one uplink time unit and one or more PDSCHs (PDCCH) are missed and detected by UE, the size or the arrangement sequence of an HARQ-ACK codebook cannot be determined due to the fact that the number of TBs of the missed PDSCHs is uncertain is avoided.
A flowchart of an example method for feeding back HARQ-ACK/NACK is described in detail below in conjunction with fig. 2 and other figures. Fig. 2 is a flow diagram of an example method 200 for feeding back HARQ-ACK/NACK according to an embodiment of the present disclosure. As shown in fig. 2, the method 200 may begin at step S210. At step S210, the UE may receive downlink control signaling from an associated base station. Next, in step S220, the UE may generate a HARQ-ACK codebook according to the downlink control signaling and a decoding result for a downlink transmission corresponding to the downlink control signaling. In step S230, the UE may feed back HARQ-ACK corresponding to the downlink transmission to the base station according to the generated HARQ-ACK codebook.
In some embodiments, the UE may determine the size of the HARQ-ACK codebook and the position of the ACK/NACK bits of the PDSCH scheduled by the downlink control signaling in the HARQ-ACK codebook according to the first and/or second class of DAI included in the downlink control signaling (note: the first and/or second class of DAI herein may be different from the first and/or second class of DAI described above in connection with fig. 1, in particular, see the definition for the first and second class of DAI described below), and the selected reference TB.
In some embodiments, if the carrier on which the current downlink time unit is scheduled is an operating mode configured to schedule only one TB at most, for example, a single antenna SIMO (single input multiple output) transmission mode, the reference TB may be the scheduled one TB, which corresponds to the DAI. In other words, it can also be understood that this step of determining the reference TB is not necessary.
In other embodiments, if the carrier scheduled by the current downlink time unit is in an operation mode configured to be schedulable by more than one TB at most and is configured in a TB scheduling mode, any one TB may be selected as the reference TB. For example, the first TB may be selected as the reference TB, which corresponds to the DAI. In other words, it can also be understood that this step of determining the reference TB is not necessary.
In still other embodiments, if the carrier scheduled for the current downlink time unit is in an operating mode configured to be schedulable by more than one TB at most and the carrier scheduled for the current downlink time unit is the carrier configured to be the CBG scheduling mode, it is determined according to the downlink control information which TB is actually scheduled to have the largest number of CBGs, and the TB is determined to be a reference TB, which corresponds to the DAI. In some embodiments, any one of the plurality of TBs may be selected to correspond to the DAI if the number of CBGs actually scheduled by the plurality of TBs is equal.
In still other embodiments, if the carrier scheduled by the current downlink time unit is an operating mode configured to be schedulable by more than one TB at most, and the carrier scheduled by the current downlink time unit is a carrier configured to be CBG scheduling mode, and the number of HARQ-ACK bits that each TB can feed back is the same, for example, each determined according to the configured maximum CBG number, any one TB may be selected as the reference TB, which corresponds to the DAI.
In some embodiments, the number of ACK/NACK bits fed back by the UE for the PDSCH scheduled for downlink control signaling may be Nmax_TB*NCBG_refWherein N ismax_TBIs the maximum number of TBs that can be scheduled in PDSCH in the configured operating mode. N is a radical ofmax_TBAnd may typically be 2. For carriers configured as CBG scheduling mode, NCBG_refMay be the number of CBGs actually scheduled for the reference TB corresponding to the DAI. For carriers configured in TB scheduling mode, NCBG_refMay be 1. For the carriers configured to be in the CBG scheduling mode, the number of HARQ-ACK bits which can be fed back by each TB is equal to the configured maximum CBG number Nmax_CBGWhen N is presentCBG_refMay be Nmax_CBG。
Alternatively, the DAIs of the first and/or second type may be referenced to a fixed one of the TBs, regardless of whether the scheduled carrier is configured to operate in CBG or TB scheduling mode. Further, the number of ACK/NACK bits fed back by the UE for the PDSCH scheduled by the downlink control signaling may be Nmax_TB*Nmax_CBG_ref. For carriers configured as CBG scheduling mode, Nmax_CBG_refMay be the maximum number of CBGs schedulable for the reference TB corresponding to the DAI. For carriers configured in TB scheduling mode, Nmax_CBG_refMay be 1.
Unlike the embodiment shown in FIG. 1, N is present in the embodiment shown in FIG. 2max_CBG_refOr NCBG_refAre for one TB. If a plurality of TBs, for example, 2 TBs, are scheduled in one PDSCH, the sum of the maximum CBG numbers of the 2 TBs of one PDSCH is Nmax_CBG_ref*2。
Similarly, if 2 TBs are scheduled, the actually scheduled CBG number of the 2 TBs of one PDSCH is NCBG_TB1+NCBG_TB2Wherein N isCBG_ref＝max(NCBG_TB1，NCBG_TB2)。
For DCI scheduling this PDSCH, the finger of each CBG for each TBThe display may be independent. For example, for 2 TBs, each TB has a bit indication for each CBG. For example if Nmax_CBG＝Nmax_CBG_refThere is an 8 bit indication whether the base station actually schedules 1 or 2 TBs. When the base station schedules only one TB, the 4 bits of the non-scheduled TB do not indicate the information of the TB, and can be used for other purposes or only serve as space occupying bits. For the DCI scheduling this PDSCH, the indication of each CBG of each TB may also be used jointly, which is not limited in this disclosure.
In the embodiment shown in fig. 2, the first type of DAI, which may be referred to as a counting DAI (counter DAI), may indicate one of the following:
(1) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And a current carrier (e.g., current carrier C)i) The number of actually scheduled CBGs (N) of reference TBs for each scheduled downlink time unit and/or downlink carrierCBG_ref) Summing;
(2) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And/or a current carrier (e.g., current carrier C)i) Adding 1 to the sum of the number of actually scheduled CBGs of the reference TB of each scheduled downlink time unit and/or downlink carrier until the latest downlink time unit and/or carrier;
(3) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And a current carrier (e.g., current carrier C)i) The number of maximum CBGs (N) up to the scheduled reference TB for each downlink time unit and/or downlink carriermax_CBG_ref) Summing; and
(4) within the HARQ-ACK feedback bundling window, to the currently scheduled downlink time unit (e.g., downlink time unit T)i) And/or a current carrier (e.g., current carrier C)i) Reference TB of each scheduled downlink time unit and/or downlink carrier up to the last downlink time unit and/or carrierPlus 1.
In the embodiment shown in fig. 2, the DAI of the second type may be used to determine the total number of bits of the HARQ-ACK codebook, or the total number of scheduled CBGs of all scheduled carriers from the first downlink time unit to the current downlink time unit in the HARQ-ACK feedback bundling window, or the maximum CBG of all scheduled carriers from the first downlink time unit to the current downlink time unit in the HARQ-ACK feedback bundling window.
In some embodiments, when the base station does not configure bundling of spatial dimensions, the total number of bits of the HARQ-ACK codebook or the total number of scheduled CBGs or the total number of maximum CBGs may be equal to the DAI and N of the second typemax_TBThe product of (a) and (b). In some embodiments, when the base station configures bundling of spatial dimensions, the total number of bits of the HARQ-ACK codebook or the total number of scheduled CBGs or the total number of maximum CBGs may be equal to the DAI of the second type.
In some embodiments, the first type of DAI may be used to calculate the start of the bit position of the ACK/NACK bit of the currently scheduled downlink time unit in the HARQ-ACK codebook. For example, if Nmax_TBThen, in some embodiments, when the base station is not configured with a binding of spatial dimensions, corresponding to (2) or (4), the downlink time unit T isiAnd downlink carrier CiThe start of the bit position of the ACK/NACK bit in the HARQ-ACK codebook may be equal to the corresponding DAI multiplied by 2 minus 1. Corresponding to (1), the downlink time unit TiAnd downlink carrier CiMay be equal to the corresponding DAI minus the downlink time unit TiAnd downlink carrier CiN of (A)CBG_refMultiplied by 2 and then added with 1. Corresponding to (3), a downlink time unit TiAnd downlink carrier CiMay be equal to the corresponding DAI minus the downlink time unit TiAnd downlink carrier CiN of (2)max_CBG_refMultiplied by 2 and then added with 1.
In addition, in other embodimentsIn the embodiment, when the base station configures the binding of the spatial dimension, corresponding to (2) or (4), the downlink time unit TiAnd downlink carrier CiThe start of the bit position of the ACK/NACK bit in the HARQ-ACK codebook may be equal to the corresponding DAI. Corresponding to (1), the downlink time unit TiAnd downlink carrier CiMay be equal to the corresponding DAI minus the downlink time unit TiAnd downlink carrier CiN of (A)CBG_refPlus 1. Corresponding to (3), the downlink time unit TiAnd downlink carrier CiMay be equal to the corresponding DAI minus the downlink time unit TiAnd downlink carrier CiN of (A)max_CBG_refPlus 1.
If the base station is not configured with the binding of the space dimension, when the UE feeds back the downlink time unit TiAnd downlink carrier CiWhen the ACK/NACK is received, the ACK/NACK of the CBG in the first TB may be mapped first, and then the ACK/NACK of the CBG in the second TB may be mapped.
Corresponding to (1) or (2), for each TB, the ACK/NACK bits of each scheduled CBG may be mapped in turn from small to large according to the index of the actually scheduled CBG. When the number of scheduled CBGs of the 2 TBs is different, for the TB with the smaller number of CBGs, the occupied bit can be sent, so that the ACK/NACK bit number of the TB is equal to NCBG_ref. For example, 2 TBs are scheduled, TBaScheduling 1 st, 2 nd, 3 rd CBG, TBbThe 2 nd and 4 th CBG are scheduled, then N CBG_ref3, 6-bit ACK/NACK is fed back. Mapping TB firstaACK/NACK of 3 CBGs, remap TBbAnd 2 nd and 4 th CBGs, and finally mapping 1-bit placeholder bits.
Corresponding to (3) or (4), when mapping ACK/NACK of each CBG in one TB, ACK/NACK bits of each CBG may be mapped sequentially from small to large according to an index of the CBG of the TB, where ACK/NACK of scheduled CBGs determines a value according to a decoding result of the CBG, and ACK/NACK of non-scheduled CBGs may be a placeholder bit and take a predefined value, so that each CBG may take a value of the predefined valueThe number of ACK/NACK bits for TB is equal to Nmax_CBG_ref. Corresponding to (1) - (4), ACK/NACK of the non-scheduled TB may be a placeholder bit and take a predefined value.
In addition, if the base station configures the binding of the spatial dimension, when the UE feeds back the downlink time unit TiAnd downlink carrier CiIf the TB scheduling mode is configured, the ACK/NACK bits of each scheduled TB may be logically and-operated. Alternatively, ACK/NACK of the not-scheduled TBs may be set as ACK, and ACK/NACK bits of the respective TBs are logically anded. If the CBG scheduling mode is configured, ACK/NACK scheduled in each TB and having the same CBG index may be logically and-operated, i.e. the non-scheduled CBG does not participate in the logical and-operation. At this time, the number of ACK/NACK bits for the PDSCH scheduled by the downlink control signaling fed back by the UE is Nmax_TB*Nmax_CBG_refIn which N ismax_TB1. Accordingly, in a reasonable manner, when the configured CBG scheduling mode adopts spatial dimension binding, and 2 TBs are scheduled, the UE may consider that a bit in the downlink scheduling signaling for indicating whether the corresponding CB/CBG is scheduled is common to the 2 TBs, that is, only one group of bits indicated by the CB/CBG is provided, and does not respectively indicate CB/CBG scheduling for the 2 TBs.
The binding of the configuration space dimension can be a piece of signaling, and is suitable for both a TB scheduling mode and a CBG scheduling mode. Or, the binding of the configuration space dimension may be two signaling configurations respectively. Alternatively, there is only one signaling for the TB scheduling mode, which defaults to the binding requiring spatial dimension.
Corresponding to (3) or (4), ACK/NACKs scheduled in respective TBs and having the same CBG index may be logically anded, i.e., non-scheduled CBGs do not participate in the logical and operation. For a CBG that is not scheduled in each TB, its ACK/NACK may be a placeholder bit. For example, if 2 TBs are scheduled, and Nmax_CBG＝4，TBaScheduling #1, #3 CBG, TBb#1, #2 CBG are scheduled. The UE generates 4-bit ACK/NACK together, corresponding to 4 bits respectivelyAnd (4) CBG. Wherein, the 1 st bit ACK/NACK is TBa#1 CBG and TBbThe 2 nd bit ACK/NACK is TB as a result of the logical AND operation of ACK/NACK for #1 CBGbACK/NACK of #2 CBG, and ACK/NACK of 3 rd bit is TBaACK/NACK for #3 CBG, and bit 4 is a placeholder bit. Alternatively, the ACK/NACK of the non-scheduled CBG may be an ACK, and the ACK/NACK of the CBG with the same CBG index within each TB is logically anded.
Corresponding to (1) or (2), for each TB, the indexes of the actually scheduled CBGs may be sequentially ordered from small to large, and a virtual CBG index j is obtained. Then, according to the virtual CBG index, the ACK/NACK of the CBG having the same CBG index in each TB is logically anded. Alternatively, the logical and operation may be performed on the ACKs/NACKs of the CBGs with the same actually scheduled CBG index in each TB, if the actually scheduled CBG indexes of each TB are different, the virtual CBG index j is obtained by sequencing the actually scheduled CBG indexes from small to large, and the logical and operation is performed on the ACKs/NACKs of the CBGs with the same CBG index in each TB according to the virtual CBG indexes.
For example, for 2 TBs, TBaCBG #1, CBG #3, #4 and TB are scheduledb CBG #1, CBG #2, CBG #4 are scheduled. Then, 3-bit ACK/NACK is fed back, wherein the 1 st bit of the HARQ-ACK codebook may be TBaCBG #1 and TB ofbThe 2 nd bit of the CBG #1 may be TBaCBG #4 and TB ofbThe ACK/NACK of CBG #4 is logically ANDed, and bit 3 may be TBaCBG #3 and TB ofbAnd the ACK/NACK of CBG #2 (1).
For example, assuming that bundling of spatial dimension is not configured, the time length of the HARQ-ACK feedback bundling window is one downlink time unit, and the frequency domain dimension has 3 carriers. In a downlink time unit, the base station may schedule PDSCH on 2 carriers, where carrier 1 is configured as CBG-based scheduling mode and the maximum number N of CBGs max_CBG_C14 and carrier 2 is configured as TB-based scheduling, and N max_CBG_C21. In addition, carrier 3 is configuredA CBG-based scheduling mode is set, and the maximum number N of CBGs max_CBG_C36. Assume that carrier 1 schedules 2 TBs, where TB isaScheduling 1 CBG (e.g., #3), TB b2 CBGs are scheduled (e.g., #1 and # 2).
Then, according to the method (1) or (2), the TB corresponding to the DAI can be the TBbAnd N isCBG_ref_C1And according to the method (3) or (4), the TB corresponding to the DAI may be optionally selected one (TB is selected)bOr TBaIs fully equivalent because the maximum CBG number configured by the base station is the same for each TB), e.g., TBaAnd N ismax_CBG_C14. Carrier 2 schedules 1 TBcThen, according to the methods (1) to (4), the TB corresponding to the DAI may be TBc，NCBG_ref_C2＝1，Nmax_CBG_C2＝1。
According to the method (1), as shown in fig. 7, the first type DAI of the carrier 1 may be 2, the first type DAI of the carrier 2 may be 3, and the second type DAIs of the carrier 1 and the carrier 2 may be 3. The HARQ-ACK codebook size fed back by the UE may be 6 bits.
In some embodiments, carrier 1 occupies 4 bits, with TBaAnd 2 bits of ACK/NACK exist, the 1 st bit in the HARQ-ACK codebook determines an ACK/NACK value according to the detection result of the scheduled CBG, and the 2 nd bit is an occupied bit. TBbThere are 2 bits of ACK/NACK, and the ACK/NACK values are determined according to the detection results of the scheduled CBGs at bits 3 and 4 in the HARQ-ACK codebook.
In some embodiments, carrier 2 occupies 2 bits, TBcWith 1 bit ACK/NACK, bit 5 in the HARQ-ACK codebook according to the scheduled TBcDetermines the ACK/NACK value and the 6 th bit in the HARQ-ACK codebook is a placeholder bit.
According to the method (2), the first type DAI of the carrier 1 may be 1, the first type DAI of the carrier 2 may be 3, and the second type DAIs of the carrier 1 and the carrier 2 may be 3. The bit mapping of ACK/NACK may be the same as the ACK/NACK bit mapping of (1).
According to method (3), in the example of FIG. 7, if N ismax_CBG_C1Expressed is the maximum number of CBGs of one PDSCH, or understandingFeeding back the number of bits for HARQ-ACK for one PDSCH, and when 2 TBs are scheduled, performing CBG dimension bundling inside each TB, assuming that each TB has 4 CBGs. As shown in FIG. 9, TB a1 and 2 CBG bindings, 3 and 4 CBG bindings, TBbThe 1 st and 2 nd CBG bindings, and the 3 rd and 4 th CBG bindings. TB can be selectedbOr TBaFor reference to TB, then the first type DAI for carrier 1 is 2. The first type DAI for carrier 2 is 3 and the second type DAI for carrier 1 and carrier 2 is 3. The HARQ-ACK codebook size fed back by the UE is 6 bits. It is easy to see that for the TB scheduled carrier and the carrier for which the CBG schedules and actually schedules 2 TBs, the first type of DAI is the count of the reference TB, but the CBG schedules and actually schedules only the carrier for 1 TB, and the DAI count is the number of CBGs/2 for this TB. Alternatively, as shown in fig. 10, carrier 1 may schedule 2 TBs at most, and carrier 1 actually schedules only TBsaAnd 3 rd CBG. Then the HARQ-ACK fed back by this TB is 4 bits, wherein the 3 rd bit determines the HARQ-ACK according to the decoding result, and the other 3 bits may send predefined placeholder bits. The first kind of DAI of the carrier 1 is 2, and the second kind of DAI is 3. The first type DAI of carrier 2 is 3 and the second type DAI is 3. This has the advantage that the overhead of DAI can be effectively reduced. The size of the HARQ-ACK codebook is second type DAI × 2. If N is presentmax_CBG_C1If 4 indicates the maximum CBG number of a TB, then in the example of fig. 7, the first class DAI of carrier 1 may be 4, the first class DAI of carrier 2 may be 5, and the second class DAIs of carrier 1 and carrier 2 may be 5. The HARQ-ACK codebook fed back by the UE has a size of 10 bits. In some embodiments, carrier 1 is 8 bits, TBaThere are 4 bits of ACK/NACK, the 3 rd bit in the HARQ-ACK codebook determines an ACK/NACK value according to the detection result of the scheduled #3 CBG, and the 1 st, 2 nd, and 4 th bits are placeholder bits. TBbThere are 4 bits of ACK/NACK, the 5 th and 6 th bits in the HARQ-ACK codebook determine the ACK/NACK value according to the scheduled #1 CBG and #2 CBG detection results, and the 7 th and 8 th bits are placeholder bits. In some embodiments, carrier 2 occupies 2 bits, TBcWith 1 bit ACK/NACK, bit 9 in the HARQ-ACK codebook according to the scheduled TBcDetermines an ACK/NACK value and determines an ACK/NACK value at HARThe 10 th bit in the Q-ACK codebook is a placeholder bit.
According to method (4), as shown in FIG. 8, Nmax_CBG_C1The maximum CBG number of one TB is represented by 4, the first class DAI of carrier 1 may be 1, the first class DAI of carrier 2 may be 5, and the second class DAIs of carrier 1 and carrier 2 may be 5. The total number of bits of the HARQ-ACK/NACK codebook is 10.
It should be noted that: for DAIs of the first or second type, it may be that one bit state corresponds to a value of multiple DAIs due to bit overhead constraints. As in LTE systems, the DAI may only contain 2 bits, but the actual values of the DAI that may be indicated are 1-32 or more. In this case, a modulo form may be generally adopted, for example, DAI ═ 00 "means that DAI takes values of 1, 5, 9, …, 4 × (M-1) + 1. For another example, the value of DAI may be determined according to a greatest common divisor of the maximum number of HARQ-ACK bits that can be transmitted per PDSCH as a step size. Suppose Nmax_CBGPossible values are 2 and 4. Then, the step size is 2, the second class DAI ═ 000 "indicates that the DAI has a value of 2,. 16 · (M-1) +2, DAI ═ 001" indicates that the DAI has a value of 4.. 16 · (M-1) +4, DAI ═ 010 "indicates that the DAI has a value of 6.. 16 · (M-1) +6, DAI ═ 110" indicates that the DAI has a value of 14.. 16 · (M-1) +14, and DAI ═ 111 "indicates that the DAI has a value of 16.. 16 · (M-1) + 16. The above embodiments are mainly described from the UE side. But it is easy to see that: in order to ensure the correct transmission and reception of the HARQ-ACK, the base station also needs to determine the value of the first type of DAI and/or the second type of DAI when the DCI is transmitted, and determine the size of the HARQ-ACK codebook and the mapping relationship of the ACK/NACK bits when the HARQ-ACK codebook is received according to the same or corresponding criteria and methods as the UE.
In some embodiments, if the base station configures the UE with at least one carrier in CBG scheduling mode, the base station cannot configure HARQ-ACK bundling (spatial bundling) of this carrier in the spatial dimension for this UE at the same time.
In some embodiments, when the uplink control signaling including HARQ-ACK exceeds the maximum number of bits that can be carried by the PUCCH format used, the UE may prioritize HARQ-ACK bundling for the spatial dimension over bundling for the CBG dimension. Alternatively, the UE may prioritize the binding in the CBG dimension over the binding in the spatial dimension. The bundling of the CBG dimension is that HARQ-ACK of a plurality of CBGs of one TB are logically ANDed to generate 1-bit HARQ-ACK. The spatial dimension HARQ-ACK bundling is performed according to the method when the base station configures the spatial dimension HARQ-ACK bundling described in the embodiment of the present disclosure.
In some embodiments, HARQ-ACK bundling through CBG dimension can be used to realize that the HARQ-ACK bit number of carrier waves scheduled based on CBG is a fixed value Nmax_harqAnd not with the number of actually scheduled TBs. The fixed value is configured by the base station or predefined by the label. This may be achieved according to at least one of the following methods:
if N ismax_harq＝Nmax_CBGAnd N ismax_CBGThe maximum total number of CBGs for all TBs scheduled at one time, the number of HARQ-ACK bits corresponding to each TB is Nmax_harq/Nmax_TB. The scheduled TB generates ACK/NACK according to the decoding result, and the unscheduled TB transmits Nmax_CBG_TBiA placeholder bit for a bit, and the predefined placeholder bit may be a NACK, or an ACK.
If N ismax_harq＝Nmax_CBGAnd N ismax_CBGThe maximum total number of CBGs for one TB scheduled at a time, the sum of HARQ-ACK bits corresponding to all TBs scheduled at a time can still be N according to the method described belowmax_CBG. For example, when 2 TBs are scheduled, the maximum number of CBGs that can be scheduled per TB is N max_CBG4, but the number of HARQ-ACK bits per TB is N max_CBG2 is obtained. One implementation may perform an and operation on HARQ-ACKs of multiple CBGs according to a predefined criterion, i.e., bundling HARQ-ACKs of multiple CBGs. For example, when 2 TBs are scheduled, assuming that the first TB schedules 4 CBGs and the second TB schedules 3 CBGs, the HARQ-ACKs of the first 2 CBGs of the first TB are anded to obtain 1-bit HARQ-ACK, and the HARQ-ACKs of the last 2 CBGs are anded to obtain 1-bit HARQ-ACK. HARQ-ACK of the first 2 CBGs of the second TB AND operation to get 1 bit HARQ-ACK and the 3 rd of the second TBThe HARQ-ACK of CBG is 1 bit. For another example, when 2 TBs are scheduled, it is assumed that the first TB schedules the 2 nd, 3 rd CBGs and the second TB schedules the 3 rd CBG. Assuming that the DAI indicates that there are 3 CBGs for this scheduling or indicates that 3-bit HARQ-ACK needs to be fed back for this scheduling, bundling is not needed. For another example, when 2 TBs are scheduled, it is assumed that the first TB schedules 4 CBGs and the second TB schedules the 3 rd CBG. Assuming that the DAI indicates that there are 3 CBGs in total for this scheduling or indicates that 3-bit HARQ-ACK needs to be fed back for this scheduling, the HARQ-ACK bundling for the 1 st and 2 nd CBGs of the first TB, the HARQ-ACK bundling for the 3 rd and 4 th CBGs, and the 3 rd CBG of the second TB generate one-bit HARQ-ACK.
Preferably, CBG of different TB, bundling is not carried out.
Preferably, no scheduled CBG is involved in bundling. For example, when 2 TBs are scheduled, assuming that the first TB schedules the 1 st and 3 rd CBGs, the 4 th CBG, and the second TB schedules the 1 st CBG, then the 2 nd CBG of the first TB does not participate in bundling, the first CBG corresponds to the 1-bit HARQ-ACK, the 3 rd and 4 th CBGs perform an and operation to obtain the 1-bit HARQ-ACK, the 1 st CBG of the second TB corresponds to the 1-bit HARQ-ACK, and 1 placeholder bit is generated. The placeholder bit is a predefined value, for example, NACK.
Preferably, there is no scheduled CBG, participating in bundling. An unscheduled CBG is an ACK if previously scheduled and successfully decoded, and is a NACK otherwise.
The bundling of the CBG dimension described above may be combined with the first type DAI/second type DAI methods of the present invention. As shown in fig. 11, the DAI is counted using CBGs as a granularity, and the number of CBGs of all TBs per PDSCH is counted. Total bit number N of feedback HARQ-ACK scheduling assuming carrier 1max_harqThe base station schedules 2 TBs, each of which can be divided into 4 CBGs, TBsaScheduling the 3 rd CBG, TBbThe 1 st, 2 nd CBG is scheduled. Carrier 2 schedules a TBc. Then, the first class DAI of carrier 1 is 1, the first class DAI of carrier 2 is 5, and the second class DAIs of carrier 1 and carrier 2 are 5, which indicates that the HARQ-ACK codebook size fed back by the UE is 5 bits. Wherein, carrier 1 takes 4 bits，TBaAnd TB b2 bits, TBaIs a space occupying bit, TBaGenerates ACK/NACK, TB according to the detection result of CBG3bThe first bit of (a) is the result of the AND operation of ACK/NACK for the detection results of CBG1 and CBG2, TBbIs a placeholder bit. Carrier 2 is 1 bit, TBcWith 1 bit ACK/NACK, bit 5 in the HARQ-ACK codebook according to the scheduled TBcDetermines an ACK/NACK value. In this example, although carrier 2 can schedule 2 TBs at maximum, the number of HARQ-ACK bits for carrier 2 is determined according to the number of actually scheduled TBs. If, according to another method of the present invention, a HARQ-ACK bit length of 2 is configured for carriers configured for TB scheduling, the HARQ-ACK codebook size in this example is 6 bits, where the 6 th bit is a placeholder bit.
By the above method, the HARQ-ACK codebook can be changed according to the number of scheduled carriers and the number of scheduled downlink time units.
Furthermore, in another method for determining the HARQ-ACK codebook, the size of the HARQ-ACK codebook may be determined by the number of downlink time units (dtus), the number of configured or activated downlink carriers that may feed back HARQ-ACKs on a given uplink time unit/uplink carrier. In addition, the maximum CBG number of the downlink carriers/downlink time units can be determined. In other words, the three dimensions may be summed. Note that: the maximum CBG number of each downlink carrier and/or downlink time unit may be the same or different. If at least one downlink carrier is configured to work in the multi-TB working mode and the base station is not configured with the binding of the space dimension, the HARQ-ACK codebook size can be multiplied by the schedulable maximum TB number on the basis of the summation of the three dimensions. The maximum number of TBs that can be scheduled is the same for all downlink carriers and/or downlink time units. And if the base station configures the spatial dimension binding, performing logical AND operation on the ACK/NACK with the same CBG index number of each TB.
In addition, in another method of determining the HARQ-ACK codebook, the size of the HARQ-ACK codebook may be determined according to a third type of DAI. The content of the third type of DAI indication is the same as that of the second type of DAI indication, or the third type of DAI indication is the total bit number of the HARQ-ACK/NACK code book expected to be received by the base station, and the total bit number of the HARQ-ACK/NACK corresponding to the PDSCH actually scheduled by the base station is less than or equal to the expected total bit number. When HARQ-ACK is sent on PUSCH, if PUSCH needs to carry out rate matching according to HARQ-ACK code book, the size of the HARQ-ACK code book is indicated by third type DAI.
In addition, in the above method, how to determine which downlink time units of the HARQ-ACKs for PDSCH are fed back in one uplink time unit is not limited. For example, it may be determined according to the prior art, according to a semi-statically configured uplink and downlink ratio, or according to a HARQ-ACK feedback time indicated in downlink control signaling, etc.
Furthermore, in some embodiments, when the UE is configured to perform CBG-based HARQ-ACK feedback, it may happen that the CRC check for each CBG in a TB is correct, but the CRC check for that TB fails. To at least partially solve or mitigate this problem, the UE may perform HARQ-ACK feedback in one of the following ways.
HARQ-ACK feedback mode one
In some embodiments, the UE may feed back not only HARQ-ACK for CBG but also HARQ-ACK for TB. The ACK/NACK bit of the TB may be located at the position where the HARQ-ACK codebook starts or at the position where the HARQ-ACK codebook ends.
For example, when the UE is scheduled with 2 TBs, for example, the bit order of the HARQ-ACK codebook is ACK/NACK bit of TB1, ACK/NACK bit of #1 CBG of TB1, ACK/NACK bit of #2 CBG of TB1, # N of TB1max_CBGACK/NACK bits of CBG, ACK/NACK bits of TB2, ACK/NACK bits of #1 CBG of TB2, # N of TB2max_CBGACK/NACK bits of CBG, where Nmax_CBGThe maximum number of CBGs per TB.
HARQ-ACK feedbackMode two
In some embodiments, the UE may feed back the HARQ-ACK of the CBG, and the bit length of the HARQ-ACK of the CBG fed back by the UE mayIs Nmax_CBG*Nmax_TB. If the bundling of the spatial dimension is adopted, the UE can feed back the HARQ-ACK of the CBG, and the bit length of the HARQ-ACK fed back by the UE to the CBG can be Nmax_CBG. For convenience, the following description is given with a single TB. If the current PDSCH scheduling is one complete TB, i.e., all CBGs of one TB are scheduled, the UE may set ACK/NACK of all CBGs as NACK when the UE finds that the CRC check of all CBGs is correct but the CRC check of the TB is incorrect. In addition, if the CRC check of the TB is also correct, the UE may set ACK/NACK of all CBGs to ACK.
Furthermore, in some embodiments, if only partial TBs are scheduled currently, i.e. partial CBGs of one TB are scheduled, and the UE finds that the CRC check of all CBGs of this TB is correct until now, but the CRC check of this TB is incorrect, the UE may determine the value of ACK/NACK according to at least one of the following three methods:
(1) feeding back NACKs for all CBGs;
(2) taking the ACK/NACK bit of the CBG which has fed back the ACK and is not scheduled in the current scheduling as NACK;
(3) and feeding back the ACK, wherein the ACK/NACK bit value of the non-scheduled CBG in the current scheduling is different from the value of the predefined occupancy bit. For example, if the predefined placeholder bit value is NACK, ACK is fed back in this case; conversely, if the predefined placeholder bit value is ACK, NACK is fed back in this case.
For example, the scheduled CBG may determine an ACK/NACK value according to a CRC check result of the corresponding CBG, and an ACK/NACK bit value of a correct CBG that is not scheduled may be equal to the ACK value. In addition, when the UE finds that the CRC result of the TB is inconsistent with the check result of the CBG, the UE may set ACK/NACK of all CBGs of this TB to NACK. For example, assume that the maximum schedulable number of CBGs is 4. At downlink time unit T1, the base station schedules an initial transmission of one TB, which is divided into 4 CBGs. If the UE receives this TB, where the CRC check of #1 and #2 CBGs fails and the CRC check of #3 and #4 CBGs succeeds, the HARQ-ACK fed back by the UE may be: NACK, ACK. The base station schedules retransmission of this TB at downlink time unit T2, schedules #1 and #2 CBGs, and the UE receives this TB. If the CRC check of #1 and #2 CBG is correct, but the CRC check of TB fails. At this time, the HARQ-ACK fed back by the UE may be: NACK, NACK.
Furthermore, in some embodiments, if only partial TBs, i.e. partial CBGs of one TB, are scheduled by the current schedule, and the UE finds that the CRC check of all CBGs of this TB is correct and the CRC check of the TB is also correct by the current schedule, the UE may determine the value of ACK/NACK according to one of the following two methods:
(1) setting ACK/NACK of all CBGs as ACK;
(2) the ACK/NACK of all the CBGs currently scheduled for transmission at this time is set as ACK, and the ACK/NACK of other CBGs are values of the placeholder bits.
In some embodiments, when the number of CBGs that a TB can actually partition is less than Nmax_CBGIn time, the above method is only suitable for the HARQ-ACK bit corresponding to the actually divisible CBG number, and does not limit how other HARQ-ACKs take values, e.g., Nmax_CBGWhen a TB CRC error occurs, 2-bit HARQ-ACK is set as NACK, and the value standard of the other 2 bits is not limited; alternatively, the above applies to Nmax_CBGOne HARQ-ACK bit, e.g., Nmax_CBGThe current TB can be divided into only 2 CBGs, and 4-bit HARQ-ACKs are all set to NACK when a TB CRC error occurs.
In some embodiments, the UE checks the CRC for a TB if and only if the UE checks the CRCs for all CBGs of one TB correctly.
The method of the foregoing embodiment may be used in combination with the embodiment shown in fig. 1 and/or the embodiment shown in fig. 2, for example, determining the HARQ-ACK value of the CBG that is not scheduled according to the method shown in fig. 2, and may be used in combination with the embodiment shown in fig. 1, or may be used in combination with other technologies.
Fig. 12 is a block diagram of an example hardware arrangement of an example network node and/or user equipment according to an embodiment of the present disclosure. The hardware arrangement 1200 may include a processor 1206. The processor 1206 may be a single processing unit or a plurality of processing units for performing different actions of the procedures described herein. The arrangement 1200 may also include an input unit 1202 for receiving signals from other entities, and an output unit 1204 for providing signals to other entities. The input unit 1202 and the output unit 1204 may be arranged as a single entity or as separate entities.
Furthermore, the arrangement 1200 may comprise at least one readable storage medium 1208 in the form of a non-volatile or volatile memory, for example an electrically erasable programmable read-only memory (EEPROM), a flash memory, an optical disc, a blu-ray disc and/or a hard disk drive. Readable storage medium 1208 may include a computer program 1210, which computer program 1210 may comprise code/computer readable instructions that, when executed by processor 1206 in arrangement 1200, cause hardware arrangement 1200 and/or a device comprising hardware arrangement 1200 to perform a procedure such as that described above in connection with fig. 1 and/or fig. 2, and any variations thereof.
The computer programs 1210 may be configured as computer program code having, for example, an architecture of computer program modules 1210A-1210C. Thus, in an example embodiment using the hardware arrangement 1200 as a base station, the code in the computer program of the arrangement 1200 may comprise: a module 1210A for determining a maximum number of Coding Block Groups (CBGs) that can be partitioned in each TB of a downlink transmission to be transmitted based on a number of scheduled Transport Blocks (TBs) in the downlink transmission and the maximum number of CBGs that can be partitioned in the downlink transmission. The code in the computer program may further include: a module 1210B for determining a CBG configuration for scheduled CBGs in respective TBs based on a maximum number of CBGs that can be partitioned in each TB of the downlink transmission. The code in the computer program may further include: a module 1210C for sending downlink control signaling indicating CBG configuration. However, other modules for performing the steps of the various methods described herein may also be included in the computer program 1210.
Furthermore, in an example embodiment using the hardware arrangement 1200 as a user device, the code in the computer program of the arrangement 1200 may comprise: a module 1210A for receiving downlink control signaling. The code in the computer program may further include: a module 1210B for generating a HARQ-ACK codebook based on the downlink control signaling and decoding results for downlink transmissions corresponding to the downlink control signaling. The code in the computer program may further include: a module 1210C for feeding back HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook. However, other modules for performing the steps of the various methods described herein may also be included in the computer program 1210.
The computer program modules may essentially perform the actions of the flows shown in fig. 1 and/or fig. 2 to simulate various devices. In other words, when different computer program modules are executed in the processor 1206, they may correspond to various different elements of various devices mentioned herein.
Although the code means in the embodiments disclosed above in connection with fig. 12 are implemented as computer program modules which, when executed in the processor 1206, cause the hardware arrangement 1200 to perform the actions described above in connection with fig. 1 and/or 2, at least one of the code means may, in alternative embodiments, be implemented at least partly as hardware circuitry.
The processor may be a single CPU (central processing unit), but may also include two or more processing units. For example, a processor may include a general purpose microprocessor, an instruction set processor, and/or related chip sets and/or special purpose microprocessors (e.g., an Application Specific Integrated Circuit (ASIC)). The processor may also include on-board memory for caching purposes. The computer program may be carried by a computer program product connected to the processor. The computer program product may comprise a computer readable medium having a computer program stored thereon. For example, the computer program product may be a flash memory, a Random Access Memory (RAM), a Read Only Memory (ROM), an EEPROM, and the above-mentioned computer program modules may in alternative embodiments be distributed in the form of a memory within the UE to the different computer program products.
The disclosure has thus been described in connection with the preferred embodiments. It should be understood that various other changes, substitutions, and additions may be made by those skilled in the art without departing from the spirit and scope of the present disclosure. Accordingly, the scope of the present disclosure is not to be limited by the specific embodiments described above, but only by the appended claims.
Furthermore, functions described herein as being implemented by pure hardware, pure software, and/or firmware can also be implemented by special purpose hardware, combinations of general purpose hardware and software, and so forth. For example, functions described as being implemented by dedicated hardware (e.g., Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), etc.) may be implemented by combinations of general purpose hardware (e.g., Central Processing Units (CPUs), Digital Signal Processors (DSPs)) and software, and vice versa.

Claims (16)

1. A method performed by a user equipment in a communication system, comprising:
receiving a Physical Downlink Shared Channel (PDSCH) comprising Code Block Groups (CBG) of Transport Blocks (TB);
generating negative acknowledgement, NACK, bits for the CBGs included in the TB if the TB is not correctly detected but each of the CBGs is correctly detected; and
the generated NACK bit is transmitted and,
wherein the number N of CBGs included in the TBCBGLess than the maximum number of CBGs configured Nmax_CBGIn case of (2), further generating at least one NACK bit, wherein the number of the at least one NACK bits is equal to Nmax_CBGAnd NCBGThe difference between them.
2. The method of claim 1, wherein for a retransmitted TB, an ACK bit is generated for a CBG of the retransmitted TB if the CBG of the retransmitted TB was decoded correctly in a previous transmission.
3. The method of claim 1, wherein the maximum number of CBGs, Nmax_CBGIs configured through higher layer signaling.
4. The method of claim 1, wherein HARQ-ACK spatial dimension bundling is not applicable where CBG-based PDSCH reception is configured.
5. A method performed by a base station in a communication system, comprising:
sending a Physical Downlink Shared Channel (PDSCH) to User Equipment (UE), wherein the PDSCH comprises a Code Block Group (CBG) of a Transport Block (TB); and
receiving a negative acknowledgement, NACK, bit for the CBGs included in the TB if the TB is not correctly detected but each of the CBGs is correctly detected;
wherein the number N of CBGs included in the TBCBGLess than the maximum number of CBGs configured Nmax_CBGIn case that at least one NACK bit is generated, wherein the number of the at least one NACK bits is equal to Nmax_CBGAnd NCBGThe difference between them.
6. The method of claim 5, wherein the maximum number N of CBGsmax_CBGIs configured through higher layer signaling.
7. The method of claim 5, wherein, for a retransmitted TB, ACK bits for a CBG of the retransmitted TB are generated if the CBG of the retransmitted TB was decoded correctly at the UE in a previous transmission.
8. The method of claim 5, wherein HARQ-ACK spatial dimension bundling is not applicable if CBG-based PDSCH reception is configured.
9. A user equipment, UE, the UE comprising:
a processor; and
a memory storing instructions that, when executed by the processor, cause the processor to:
receiving a Physical Downlink Shared Channel (PDSCH), wherein the PDSCH comprises a Code Block Group (CBG) of a Transport Block (TB);
generating negative acknowledgement, NACK, bits for the CBGs included in the TB if the TB is not correctly detected but each of the CBGs is correctly detected; and
the generated NACK bit is transmitted and,
wherein the number N of CBGs included in the TBCBGLess than the maximum number of CBGs configured Nmax_CBGIn case of (2), further generating at least one NACK bit, wherein the number of the at least one NACK bits is equal to Nmax_CBGAnd NCBGThe difference between them.
10. The UE of claim 9, wherein the instructions, when executed by the processor, further cause the processor to: for a retransmitted TB, generating ACK bits for a CBG of the retransmitted TB if the CBG of the retransmitted TB was decoded correctly in a previous transmission.
11. The UE of claim 9, wherein the maximum number N of CBGsmax_CBGIs configured through higher layer signaling.
12. The UE of claim 9, wherein HARQ-ACK spatial dimension bundling is not applicable where CBG-based PDSCH reception is configured.
13. A base station, comprising:
a processor; and
a memory storing instructions that, when executed by the processor, cause the processor to:
sending a Physical Downlink Shared Channel (PDSCH) to User Equipment (UE), wherein the PDSCH comprises a Code Block Group (CBG) of a Transport Block (TB); and
receiving a negative acknowledgement, NACK, bit for the CBGs included in the TB if the TB is not correctly detected but each of the CBGs is correctly detected;
wherein the number N of CBGs included in the TBCBGLess than the maximum number of CBGs configured Nmax_CBGIn case that at least one NACK bit is generated, wherein the number of the at least one NACK bits is equal to Nmax_CBGAnd NCBGThe difference between them.
14. The base station of claim 13, wherein the maximum number of CBGs, Nmax_CBGIs configured through higher layer signaling.
15. The base station of claim 13, wherein, for a retransmitted TB, an ACK bit for a CBG of the retransmitted TB is generated if the CBG of the retransmitted TB was decoded correctly at the UE in a previous transmission.
16. The base station of claim 13, wherein HARQ-ACK spatial dimension bundling is not applicable if CBG-based PDSCH reception is configured.
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CN202210663807.8A CN114826490A (en) 2017-05-05 2017-09-11 Scheduling method, HARQ-ACK feedback method and corresponding equipment
US16/611,115 US11219049B2 (en) 2017-05-05 2018-04-25 Method and apparatus for transmitting and receiving signal in mobile communication system
EP23152657.5A EP4191920A1 (en) 2017-05-05 2018-04-25 Method and apparatus for transmitting and receiving signal in mobile communication system
RU2019139378A RU2746224C1 (en) 2017-05-05 2018-04-25 Method and equipment for transmission and reception of signal in mobile communication system
EP18793969.9A EP3635898A4 (en) 2017-05-05 2018-04-25 Method and apparatus for transmitting and receiving signal in mobile communication system
PCT/KR2018/004801 WO2018203612A1 (en) 2017-05-05 2018-04-25 Method and apparatus for transmitting and receiving signal in mobile communication system
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