KR102499381B1 - Method and apparatus for transmitting and receiving signals in a mobile communication system - Google Patents

Abstract

This disclosure proposes a method performed for scheduling downlink transmissions in a network node and a corresponding network node. The method according to the present disclosure is based on the number of transport blocks (TBs) scheduled during downlink transmission and the maximum number of divisible coding block groups (CBGs) during downlink transmission, CBGs divisible within each TB of downlink transmission determining the maximum number of ; determining a CBG configuration of CBGs scheduled within a TB based on a maximum number of divisible CBGs within each TB of a downlink transmission; and transmitting downlink control signaling indicating the CBG configuration. In addition, the present disclosure proposes a method performed in a user equipment (UE) for HARQ-ACK (Hybrid AutomaticRepeat Request Acknowledgment) feedback, a corresponding user equipment, and a communication system including the network node and the user equipment.

Description

Method and apparatus for transmitting and receiving signals in a mobile communication system

The present disclosure relates to the field of mobile communication technology, and more particularly, downlink scheduling method and corresponding network node, HARQ-ACK (Hybrid Automatic Repeat Request-Acknowledgement) feedback method and corresponding user equipment, computer storage medium, and network node and a communication system including user equipment.

Efforts have been made to develop improved fifth generation (5G) or preliminary 5G communication systems to meet the growing demand for wireless data traffic following the deployment of fourth generation (4G) communication systems. The 5G or preliminary 5G communication system is also called a 'beyond 4G (after 4G) network' or a 'post long term evolution (LTE) system'. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, such as 60 Ghz bands, to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, large-scale multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large-scale antenna Techniques are being discussed in relation to 5G communication systems. In addition, in 5G communication systems, advanced small cells, cloud radio access networks (RANs), dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, coordinated communication, CoMP (Coordinated Multi-Points), development for improving the system network based on interference cancellation at the receiving end is in progress. In 5G systems, hybrid frequency shift keying (FSK) and Feher's quadrature amplitude modulation (FQM) modulation (FQM) and sliding window superimposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC) as advanced access technology ), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) have been developed.

The Internet, a person-centered access network in which people create and consume information, is currently evolving into the Internet of Things (IoT), in which distributed entities such as objects exchange and process information without human intervention. The Internet of Everything (IoE), a combination of IoT technology and big data processing technology through cloud servers, has emerged. Technology elements such as "sensing technology", "wired/wireless communication and network infrastructure", "service interface technology" and "security technology" are required for IoT implementation, such as M2M (machine-to-machine) communication, MTC (machine type communication) has recently been studied. Such an IoT environment can provide intelligent Internet technology services that create new values in human life by collecting and analyzing data generated between connected objects. IoT provides smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services through convergence and combination between existing information technology (IT) and various industrial applications. It can be applied in a variety of fields, including

Along with this, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, MTC, and M2M communications may be implemented by beamforming, MIMO, and array antennas. The application of cloud RAN as the above-described big data processing technology can also be regarded as an example of convergence between 5G technology and IoT technology.

As described above, various services may be provided according to the development of wireless communication systems, and accordingly, a method for easily providing such services is required.

New solutions are urgently needed on how to design the downlink scheduling signaling and how to design the HARQ-ACK feedback mechanism so that the uplink and downlink control signaling overhead are properly made without affecting the scheduling flexibility. there is.

This disclosure proposes a method performed for scheduling downlink transmissions in a network node and a corresponding network node. In this method, based on the number of transport blocks (TBs) scheduled during downlink transmission and the maximum number of coded block groups (CBGs) that can be divided during the downlink transmission, CBGs divisible within each TB of the downlink transmission determining the maximum number; determining a CBG configuration of CBGs scheduled within a corresponding TB based on the maximum number of CBGs that can be divided within each TB of the downlink transmission; and transmitting downlink control signaling indicating the CBG configuration. In addition, the present disclosure proposes a method performed in a user equipment (UE) for HARQ-ACK (Hybrid AutomaticRepeat Request Acknowledgment) feedback, a corresponding user equipment, and a communication system including the network node and the user equipment.

The solution according to the above embodiment makes uplink and downlink control signaling overhead reasonable without affecting scheduling flexibility.

These and/or other embodiments and advantages of the present disclosure will become apparent and more readily understood from the following description of some of the specific embodiments taken in conjunction with the accompanying drawings.
1 is a flow diagram illustrating an example method for scheduling downlink transmissions according to one embodiment of the present disclosure.
2 is a flow diagram illustrating an exemplary method for feeding back HARQ-ACK/NACK according to an embodiment of the present disclosure.
3 is a diagram illustrating creation of a virtual CBG and an actual CBG according to an embodiment of the present disclosure.
4 is a diagram illustrating actual CBG generation according to another embodiment of the present disclosure.
5 is a schematic diagram illustrating HARQ-ACK feedback according to an embodiment of the present disclosure.
6 is another schematic diagram illustrating HARQ-ACK feedback according to an embodiment of the present disclosure.
7 is a schematic diagram illustrating HARQ-ACK feedback according to another embodiment of the present disclosure.
8 is another schematic diagram illustrating HARQ-ACK feedback according to another embodiment of the present disclosure.
9 is another schematic diagram illustrating HARQ-ACK feedback according to another embodiment of the present disclosure.
10 is another schematic diagram illustrating HARQ-ACK feedback according to another embodiment of the present disclosure.
11 is another schematic diagram illustrating HARQ-ACK feedback according to another embodiment of the present disclosure.
12 is a block diagram illustrating an exemplary hardware configuration of an exemplary network node and/or user equipment according to an embodiment of the present disclosure.
13 is a block diagram illustrating another exemplary hardware configuration of an exemplary network node and/or user equipment according to an embodiment of the present disclosure.

In order to at least partially solve or reduce the above problems, embodiments of the present disclosure propose a downlink transmission scheduling method and network node, a HARQ-ACK feedback method and user equipment, and corresponding computer-readable storage media and communication systems.

According to a first embodiment of the present disclosure, a method performed for scheduling downlink transmission in a network node is provided. This method is based on the number of transport blocks (TBs) that can be scheduled during downlink transmission and the maximum number of coding block groups (CBGs) that can be divided during the downlink transmission, which can be divided within each TB of the downlink transmission determining the maximum number of CBGs; determining a CBG configuration of CBGs scheduled within a corresponding TB based on the maximum number of CBGs that can be divided within 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 divided during downlink transmission is set through higher layer signaling and does not change according to the maximum number of TBs that can be scheduled during downlink transmission. In some embodiments, the maximum number of TBs that can be scheduled is set through higher layer signaling. For example, when the number of TBs that can be scheduled is 1, the transmission mode set by the base station is different from the case where the number of TBs that can be scheduled is 2. Here, the number of TBs that can be scheduled may be regarded as the maximum number of TBs that can be scheduled. It is easy to see that these numbers change semi-stationarily. In a transmission mode in which the number of TBs that can be scheduled is 2, the number of TBs that can be scheduled can be 1 or 2 during actual scheduling of the base station. In some embodiments, the number of TBs that can be scheduled in downlink transmission is indicated through physical layer signaling. For example, the base station sets a transmission mode in which up to two TBs can be scheduled and indicates whether one or two TBs can be simultaneously scheduled through physical layer signaling (DCI). Here, the number of TBs that can be scheduled may be regarded as the number of TBs that are actually scheduled. It is easy to see that this is a dynamic process. In scheduling of a special case, such as scheduling of DCI 1A for fall back in an LTE system, how to determine the number of CBGs is not within the scope of the present invention. In the fallback case, instead of subdividing TB into CBGs, TB-based scheduling is used.

In some embodiments, each of the downlink transmissions is based on the number of transport blocks (TBs) to be transmitted that can be scheduled in the downlink transmission and the maximum number of coded block groups (CBGs) that can be divided in the downlink transmission. Determining the maximum number of CBGs that can be divided in a TB of is, if the downlink transmission can schedule only one TB, the same as the maximum number of CBGs that can be divided during the downlink transmission Division into the one TB determining the maximum number of possible CBGs; When the downlink transmission substantially schedules one TB, determining the maximum number of divisible CBGs in the one TB to be the same as the maximum number of CBGs that can be divided in the downlink transmission; When the downlink transmission substantially schedules one TB, which is the initial transmission, the maximum number of CBGs that can be divided into the one TB is determined equal to the maximum number of CBGs that can be divided during the downlink transmission, and of the TB maintaining the maximum number of CBGs that can be divided in the TB without changing during retransmission; If the downlink transmission can schedule two TBs, a divisible CBG of each of the two TBs such that the sum of the maximum numbers of divisible CBGs of the two TBs is equal to the maximum number of divisible CBGs in the downlink transmission determining maximum numbers of CBGs, and the maximum numbers of divisible CBGs of the two TBs are the same or differ by one; When the downlink transmission substantially schedules two TBs, each of the two TBs is divisible so that the sum of the maximum numbers of divisible CBGs of the two TBs is equal to the maximum number of divisible CBGs in the downlink transmission. determining maximum numbers of CBGs, and the maximum numbers of divisible CBGs of the two TBs are the same or differ by one from each other; If the downlink transmission can schedule two TBs, a divisible CBG of each of the two TBs such that the sum of the maximum numbers of divisible CBGs of the two TBs is equal to the maximum number of divisible CBGs in the downlink transmission determine the maximum numbers of , and the maximum numbers of divisible CBGs of the two TBs are equal to or different from each other, and when only one of the TBs is scheduled by the downlink transmission when retransmitting the two TBs, the The maximum number of divisible CBGs of one TB includes at least one of the same steps as the maximum number of divisible CBGs of the TB when simultaneously scheduling two TBs.

In some embodiments, determining the CBG configuration of CBGs scheduled in each TB based on the maximum number of divisible CBGs in each TB of the downlink transmission is such that the number of CBGs scheduled in each TB is and determining a CBG configuration of CBGs that can be scheduled in each of the TBs to be less than or equal to the maximum number of partitions in each of the TBs. Determining a CBG configuration of CBGs scheduled in a corresponding TB based on the maximum number of CBGs that can be divided in each TB of the downlink transmission is divisible for each TB during the downlink transmission Based on the maximum number of CBGs, determining the maximum number of virtual CBGs for the corresponding TB; determining the number of virtual CBGs for the TB based on the size of the TB and the maximum number of virtual CBGs for the TB; and mapping virtual CBGs to the real CBGs so that the number of real CBGs does not exceed the maximum number of divisible CBGs in the TB. In some embodiments, determining a CBG configuration of CBGs scheduled within a TB based on a maximum number of divisible CBGs within each TB of the downlink transmission determines, for each TB, the CBG configuration To do this, determining the number of CBGs actually scheduled based on the size of the TB and the maximum number of CBGs that can be divided in the TB. In some embodiments, the downlink control signaling indicating the CBG configuration may include an independent field for each CBG to indicate whether the corresponding CBG is scheduled; an independent field for each CBG to indicate whether a Hybrid Automatic Repeat request (HARQ) buffer for that CBG should be emptied; an independent field allowing a plurality of CBGs to indicate whether a Hybrid Automatic Repeat request (HARQ) buffer for corresponding CBGs should be emptied; a first type of downlink allocation index (DAI); and at least one of the second type of DAI. In some embodiments, the downlink allocation index (DAI) of the first type is the sum of the currently scheduled downlink time unit and the number of CBGs scheduled within the HARQ-ACK feedback bundlingwindow up to the current carrier. ; Add 1 to the sum of the number of CBGs scheduled within the HARQ-ACK feedback bundling window up to the current scheduled downlink time unit and/or the last downlink time unit and/or the carrier prior to the current carrier; the sum of the currently scheduled downlink time unit and the maximum number of CBGs of the downlink carrier and/or scheduled downlink time unit within the HARQ-ACK feedback bundling window up to the current carrier; Maximum number of scheduled downlink time units and/or CBGs of the downlink carrier within the HARQ-ACK feedback bundling window up to the current scheduled downlink time unit and/or the last downlink time unit and/or carrier preceding the current carrier Represents one of the sums plus 1. In some embodiments, the second type of DAI may include a total number of bits of a HARQ-ACK codebook; a total number of scheduled CBGs of all scheduled carriers from a first downlink time unit among all scheduled downlink time units to the current downlink time unit within the HARQ-ACK feedback bundling window; and the total number of maximum numbers of CBGs of all scheduled carriers from a first downlink time unit among all scheduled downlink time units to the current downlink time unit 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 embodiment of the present disclosure, a network node for scheduling downlink transmissions is provided. The network node divides within each TB of the downlink transmission based on the number of transport blocks (TBs) that can be scheduled during downlink transmission and the maximum number of coding block groups (CBGs) that can be divided during the downlink transmission. a coding block group maximum number determination unit configured to determine the maximum number of CBGs; a CBG configuration determination unit configured to determine a CBG configuration of CBGs scheduled within a corresponding TB based on the maximum number of CBGs that can be divided within each TB of the downlink transmission; and a control signaling transmitter configured to transmit downlink control signaling indicating the CBG configuration.

According to a third embodiment of the present disclosure, a network node for scheduling downlink transmission is provided. The network node, when executed by the processor, determines the downlink transmission based on the number of transport blocks (TBs) that can be scheduled during downlink transmission and the maximum number of divisible coding block groups (CBGs) during downlink transmission. determine the maximum number of divisible CBGs within each TB of the link transmission; determining a CBG configuration of CBGs scheduled in a corresponding TB based on the maximum number of CBGs divisible in each TB of the downlink transmission; and a memory storing instructions for transmitting downlink control signaling indicating the CBG configuration.

According to a fourth embodiment of the present disclosure, there is provided a computer readable storage medium storing instructions that, when executed by a processor, cause the processor to implement the method according to the first embodiment of the present disclosure.

According to a fifth embodiment of the present disclosure, a method performed in a user equipment (UE) to report HARQ-ACK (Hybrid AutomaticRepeat Request Acknowledgment) is provided. The method includes receiving downlink control signaling; generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; and transmitting a HARQ-ACK corresponding to 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 includes a first type of downlink allocation index (DAI); DAI of the second type: information used to determine the number of transport blocks based on what the HARQ-ACK is fed back; a maximum number of divisible coding block groups (CBGs) in the transport block (TB); and information about whether the HARQ-ACK feedback performs spatial dimension bundling. In some embodiments, in the same uplink transmission, HARQ-ACK feedback may be scheduled. When the number of transport blocks through at least one capable carrier is greater than 1: When the downlink control signaling indicates that spatial dimension bundling is not performed, the number of transport blocks based on what HARQ-ACK is fed back is equal to 2; When the downlink control signaling indicates that spatial dimension bundling is performed, the number of transport blocks based on which HARQ-ACK is fed back is equal to one. In some embodiments, the bit length of ACK/NACK for downlink transmission is the product of the maximum number of CBGs divisible within one TB and the number of transport blocks based on which HARQ-ACK is fed back; It is the product of the number of CBGs actually scheduled by the reference transport block and the number of transport blocks based on which HARQ-ACK is fed back. In some embodiments, the reference transport block is the transport block with the maximum number of CBGs actually scheduled. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission According to the second type of DAI of downlink control signaling, determining the bit length of the HARQ-ACK codebook as the product of the value of the second type of DAI and the number of transport blocks based on which the HARQ-ACK is fed back Include steps. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission and determining a starting point of a bit position of ACK/NACK of the downlink transmission in the HARQ-ACK codebook according to a first type DAI of downlink control signaling. In some embodiments, the step of determining the starting point of the bit position of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook according to the first type DAI of the downlink control signaling is in the HARQ-ACK codebook determining a starting point of a bit position of ACK/NACK of the downlink transmission as a first type DAI of the downlink control signaling; Determining a starting point of a bit position of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook as a first type DAI of the downlink control signaling - a bit length of the ACK/NACK of the downlink transmission + 1; The starting point of the bit position of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook is the product of the first type DAI of the downlink control signaling and the number of transport blocks based on the HARQ-ACK being fed back - 1 determining as; And the product of the starting point of the bit position of the ACK/NACK of the downlink transmission in the HARQ-ACK codebook by the number of transport blocks based on the first type DAI of the downlink control signaling and the HARQ-ACK being fed back - determining as the bit length of the ACK/NACK of the downlink transmission + 1. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission Determine the bit length of ACK / NACK of downlink transmission as the product of the maximum number of CBGs that can be divided within one TB and the number of transport blocks based on the feedback of the HARQ-ACK, but scheduled within scheduled TBs ACK/NACKs of CBGs are generated according to CRC checksums of actually scheduled CBGs, ACK/NACKs of unscheduled CBGs are dummy bits, and ACK/NACKs of unscheduled TBs are dummy bits Include steps taken In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission The bit length of ACK/NACK of link transmission is determined as the product of the number of CBGs actually scheduled by the reference transport block and the number of transport blocks based on which the HARQ-ACK is fed back, but the ACK of the reference transport block /NACK is generated according to the CRC checksum of the actually scheduled CBGs, ACK/NACK of the non-reference transport block is generated according to the CRC checksum of the CBGs actually scheduled by the non-reference transport block, and the non-reference transport block and generating additional dummy bits so that the bit length of ACK/NACK of is equal to the number of CBGs actually scheduled by the reference transport block. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission Determine the bit length of the ACK / NACK bit of downlink transmission as the maximum number of CBGs divisible by the TB when the downlink control signaling indicates spatial dimension bundling, but the ACK / NACK is in each TB It includes a step obtained by logically ANDing ACK/NACKs of CBGs that are scheduled and have the same CBG index. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission, When all CBGs of a TB are scheduled by downlink transmission, if it is determined that all CBGs of the TB are correctly detected by the CRC checksums for each CBG: Generating a NACK value for each of the CBGs of the TB when not accurately detected by the TB, and generating an ACK value for each of the CBGs of the TB when the TB is accurately detected by the CRC checksum for the TB includes In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission, The current downlink transmission does not include all CBGs of one TB, and up to the current scheduling time, all CBGs of the TB are correctly detected by the CRC checksums for each CBG, but the TB has a CRC checksum If not detected correctly by , the ACK/NACK is generated as at least one of the following: a NACK value for each of the CBGs of the TB is generated; A NACK is generated for each of the CBGs for which ACKs were previously fed back but not scheduled in the current scheduling; An ACK/NACK value opposite to the value of a predetermined dummy bit is generated for each of the CBGs for which ACKs have been fed back but are not scheduled in current scheduling. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission includes: Feeding back not only ACK/NACKs of divided CBGs for link transmission but also HARQ-ACK of the corresponding TB for downlink transmission. In some embodiments, the downlink transmission is a Physical Downlink Shared Channel (PDSCH) transmission.

According to a sixth embodiment of the present disclosure, a user equipment (UE) for feeding back HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment) is provided. The UE includes a control signaling receiver configured to receive downlink control signaling; a codebook generator configured to generate a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; and a feedback unit configured to feed back HARQ-ACK corresponding to downlink transmission according to the generated HARQ-ACK codebook.

According to a seventh embodiment of the present disclosure, a user equipment (UE) for feeding back HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment) is provided. The UE includes a processor, a control signaling receiver configured to receive downlink control signaling when executed by the processor; generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; and a memory storing instructions for feeding back HARQ-ACK corresponding to downlink transmission according to the generated HARQ-ACK codebook.

According to an eighth embodiment of the present disclosure, a computer readable storage medium storing instructions that, when executed by a processor, cause the processor to implement a method according to the fifth embodiment of the present disclosure is provided.

A communication system is provided according to an eighth embodiment of the present disclosure. The communication system includes a network node according to the second or third embodiment of the present disclosure, and one or more UEs according to the sixth or seventh embodiment of the present disclosure.

According to the solutions according to the embodiments of the present disclosure, effectively reduce the HARQ-ACK feedback overhead when using CBG transmission, and the base station (network node) and the UE misunderstand the size of the HARQ-ACK codebook (also called codebook) it becomes possible to prevent In particular, when both CBG transmission and MIMO mode are used, the embodiments of the present disclosure effectively reduce the overhead of the downlink control channel and the uplink channel carrying HARQ-ACK feedback.

Example of Invention

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, and details and functions not necessary for the present disclosure will be omitted in the description to avoid obscuring the understanding of the present disclosure. The following description of various embodiments used to describe the principles of the present disclosure is provided for purposes of illustration only and should not be construed as limiting the scope of the present disclosure in any way. The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of exemplary embodiments of the present disclosure as defined by the claims and equivalents thereof. The following content contains many specific details to aid understanding, but these are to be regarded as examples only. Accordingly, it is expected that those skilled in the art may make various changes and modifications to the embodiments described herein without departing from the scope and concept of the present disclosure. Also, descriptions of well-known functions and configurations may be omitted for clarity and conciseness. Also, like reference numerals are used throughout the drawings for the same or similar functions and operations. All or some of the functions, features, units, modules, etc. described in the various embodiments described below may be combined, detected, and/or modified to construct new embodiments falling within the scope of the present disclosure. can In addition, the term "comprising" and its derivatives in this disclosure is meant to be inclusive and not intended to be limiting.

In the following, various solutions according to embodiments of the present disclosure are described in detail, taking “base station (abbreviated as BS)” and “user equipment (abbreviated as UE)” as examples, but the present disclosure is not limited thereto. In fact, this disclosure can be applied to all known or future developed wireless communication standards, including but not limited to 2G, 3G, 4G, 5G, and the like. For example, a base station may include, but is not limited to, a base transceiver station (BTS), a radio base station (RBS), a NodeB, an evolved node B (eNodeB), a relay station, a transmission point, and the like. Accordingly, the term "base station" may be used interchangeably with the generic term "network node" including the above items to indicate a network-side node capable of providing the same or similar functions as a base station. Also, in this document, user equipment may actually include (but not be limited to) concepts of terms such as user equipment, mobile station, mobile terminal, smart phone, tablet, and the like.

In order to support more flexible scheduling, 3GPP is deciding to support a variable HARQ-ACK feedback delay in 5G. In 5G systems, depending on whether they are Frequency Division Duplex (FDD) or Time Division Duplexor Time Division Duplex (TDD) systems, a specific downlink (also referred to as “down”) time unit (time resource, e.g., downlink slot) or downlink mini-slots), the uplink (also called “up”) time units that can be used for HARQ-ACK feedback are variable. For example, delay of HARQ-ACK feedback may be dynamically indicated by physical layer signaling, and various HARQ-ACK delays may be determined according to factors such as various services or user equipment performance. Therefore, even in the FDD system, HARQ-ACK for downlink data transmission of multiple downlink time units can be fed back in one uplink time unit.

In addition, considering that the size of a transport block (or Tb in abbreviation) can be further increased in a 5G system, eMBB (Enhanced In order to better support the coexistence of the puncturing part of the PDSCH (Physical Downlink Shared Channel) of the Mobile Broadband (Mobile Broadband) service, 3GPP further refined the scheduling granularity in 5G, and It is decided to expand to scheduling in code block (abbreviated Cb)/code block group (CB group or abbreviated CBG) units. Scheduling in CB/CBG units is mainly used for retransmission.

5G systems will continue to support Multiple Input Multiple Output (MIMO) transmission. When operating in MIMO transmission mode, multiple Tb's can be concurrently scheduled on one downlink time unit of one carrier. For example, for initial transmission, only 1 TB is scheduled when the number of layers for MIMO transmission is 4 or less. If the number of tiers is greater than 4, 2 TBs are scheduled. Otherwise, in retransmission, even if the number of layers is 4 or less, 2 TBs may be scheduled. Naturally, the number of TBs actually scheduled at each point in time by the base station can be dynamically varied.

In addition, 5G continues to support carrier aggregation to flexibly utilize various spectrum resources. That is, the base station may configure multiple carriers for one user equipment (UE). In 5G systems, it is easy to see that the dimensions are increased compared to LTE in terms of downlink scheduling or uplink feedback HARQ-ACK.

An exemplary method for scheduling downlink transmission according to an embodiment of the present disclosure will first be described in detail below with reference to FIG. 1 and other figures. 1 is a flow diagram illustrating an example method for scheduling downlink transmissions according to one embodiment of the present disclosure.

In the embodiment shown in FIG. 1 , prior to starting the method 100, the base station may generally configure whether the scheduling mode of a carrier (eg, carrier Ci below) is TB-based scheduling or CBG-based scheduling. When CBG-based scheduling is configured, the base station may set the maximum number of schedulable CBGs as, for example, Nmax_CBG. When setting the value, the base station may explicitly set it as the maximum number of schedulable CBGs. Also, in other embodiments, the maximum number of schedulable CBGs may be implicitly indicated by setting the maximum number of HARQ-ACK bits that can be fed back for each scheduling. For ease of explanation, it will be described in terms of the maximum number of schedulable CBGs. However, those skilled in the art will appreciate that the present disclosure is not limited thereto. In addition, in some embodiments, the base station may further configure whether the HARQ-ACK feedback mode of the connected UE is based on TB-based granularity or CBG-based granularity.

Unless otherwise specified, the present invention does not limit how a base station divides one TB into multiple CBs and furthermore how to combine multiple CBs into CBGs. For example, the base station determines how many CBs to divide according to the size of TB, and then determines how many CBGs to combine according to Nmax_CBG.

In some embodiments, the signaling for setting the HARQ-ACK feedback mode may be the same as the signaling for setting the carrier scheduling mode. For example, if the scheduling mode of carrier Ci is set to be based on TB, HARQ-ACK feedback may also be implicitly set to be based on TB. Conversely, in some other embodiments, the signaling used to establish the HARQ-ACK feedback mode may be independent of the signaling used to establish the carrier scheduling mode. For example, the scheduling mode of carrier Ci is set to be based on TB, but the HARQ-ACK feedback is set to be based on CBG. Also, in some embodiments, all or part of the configuration information may be semi-statically configured through higher layer signaling. When not configured as a CBG-based scheduling/feedback mode, the base station may explicitly indicate the scheduling information of each CBG in the downlink control signaling DCI, or may indicate it implicitly, and the UE may indicate which CBG according to a predetermined criterion. can determine whether they are scheduled. The present disclosure does not place any particular limitations thereon.

Also, in some embodiments, the base station may further configure a MIMO transmission mode (which may also be referred to as a MIMO scheduling mode in some cases). For example, transmission between a base station and a UE may be configured as a SIMO (Single-Input Multiple-Output) or MIMO transmission mode, but the number of MIMO layers is not limited. Also, in some embodiments, transmission between the base station and the UE may be set to a transmission mode that transmits at most one TB or two TBs.

In some embodiments, the base station may set Nmax_CBG, the maximum number of CBGs that can be scheduled for one schedule. When multiple TBs are scheduled with one schedule, the total number of CBGs scheduled within all TBs does not exceed Nmax_CBG. When only one TB is scheduled in a schedule, the total number of CBGs scheduled for that TB usually does not exceed Nmax_CBG.

In other embodiments, the base station may set the maximum number of CBGs that can be scheduled for one TB in one schedule, Nmax_CBG, so that the total number of CBGs scheduled for one TB does not exceed Nmax_CBG. In this case, when two TBs are scheduled with one schedule, the total number of CBGs scheduled within the two TBs does not exceed 2*Nmax_CBG. Therefore, the base station can set whether the maximum number of CBGs Nmax_CBG is the total number of CBGs in one schedule or the total number of CBGs in one TB in one schedule. In some embodiments, information related to configuration may be semi-statically configured through higher layer signaling.

In some embodiments, the maximum number of CBGs Nmax_CBG may be defined in the standard as the total number of CBGs in one schedule. In other embodiments, the maximum number of CBGs Nmax_CBG may be defined in the standard as the total number of CBGs for one TB in one schedule.

Next, an exemplary method 100 for scheduling downlink transmission according to an embodiment of the present disclosure will be described in detail with steps S110 to S130 shown in FIG. 1 .

As shown in FIG. 1 , method 100 may begin at step S110. In step S110, the base station determines each of the downlink transmissions according to the number of transport blocks (TBs) that can be scheduled during downlink transmission to be transmitted to the UE and the maximum number of divisible coding block groups (CBGs) during downlink transmission. The maximum number of divisible CBGs in a TB may be determined.

In some embodiments, when the scheduling mode of a carrier (eg, carrier Ci) is set to CBG-based scheduling as described above by the base station, the base station sets the maximum number of TBs that can be scheduled and the determined Based on the maximum number of CBGs, Nmax_CBG, the maximum number of CBGs that can be scheduled in each TB, Nmax_CBG_TBi, can be determined. In step S110, the base station may determine the maximum number of CBGs that can be actually scheduled in each TB, Nmax_CBG_TBi, according to the maximum number NTB of TBs that can be scheduled and/or a predetermined criterion. In some embodiments, the predetermined criterion may be:

Nmax_CBG_TBi = Nmax_CBG / NTB。

In some embodiments, when the scheduling mode of a carrier (eg, carrier Ci) is configured as CBG-based scheduling as described above by the base station, the base station determines the number of actually scheduled Tbs and the maximum number of CBGs determined as described above Nmax_CBG Based on , the maximum number of CBGs that can be scheduled in each TB, Nmax_CBG_TBi, can be determined.

In step S110 of some embodiments, if the maximum number of divisible coding block groups (CBGs) Nmax_CBG in downlink transmission is the total number of CBGs in one schedule, the base station determines the maximum number of TBs that can be scheduled NTB and/or predetermined According to the criterion, Nmax_CBG_TBi, the maximum number of CBGs that can be actually scheduled in each TB, can be determined. In some embodiments, the predetermined criterion may be:

Nmax_CBG_TBi = Nmax_CBG / NTB。

If Nmax_CBG is not an integer multiple of NTB, Nmax_CBG may be partitioned into NTB TBs according to an even partitioning principle, if possible in some embodiments. For example, when Nmax_CBG = 5 and NTB = 2, Nmax_CBG_TB1 of the 1st TB may be 2 and Nmax_CBG_TB2 of the 2nd TB may be 3, or Nmax_CBG_TB1 of the 1st TB may be 3 and Nmax_CBG_TB2 of the 2nd TB may be 2 can

As shown in FIG. 1 , method 100 may then proceed to step S120. In step S120, the base station may determine a CBG configuration of CBGs scheduled within a corresponding TB based on the maximum number of CBGs that can be divided within each TB of downlink transmission.

In some embodiments, to determine the configuration of CBGs that can actually be scheduled, it can be implemented in at least two ways. Alternatively, the configuration of CBGs for each TB may be determined in different ways depending on the size of the TB and Nmax_CBG_TBi.

1st CBG configuration

In some embodiments, for each TB, the base station may determine the maximum number of virtual CBGs of that TB, Nvirtual_max_CBG_TBi, by Nmax_CBG. For example, Nvirtual_max_CBG_TBi = Nmax_CBG. In this case, the base station may determine the number of scheduled virtual CBGs according to the TB size and Nvirtual_max_CBG_TBi. Subsequently, the base station may map the virtual CBG to the actual CBG according to a predetermined scheme so that the number of CBGs that can actually be scheduled does not exceed the maximum number of CBGs that can actually be scheduled in the corresponding TB, Nmax_CBG_TBi. In this way, the CBG configuration within each TB can be determined.

For example, as shown in the lower part of FIG. 3, if Nmax_CBG = 4, the base station schedules two TBs, TBa and TBb, in this scheduling, so Nmax_CBG_TBi = 2 as described above. Taking TBa as an example, Nvirtual_max_CBG_TBa = 4 and Nmax_CBG_TBa = 2. Assume that the size of TBa is 50000 and can be divided into 6 Cbs and divided into 4 virtual CBGs. The first and second CBs constitute a first virtual CBG, the third and fourth CBs constitute a second virtual CBG, the fifth CB constitutes a third virtual CBG, and the sixth CB constitutes a fourth virtual CBG. Four virtual CBGs can be mapped to two real CBGs. Then, the first and second virtual CBGs may be mapped to the first real CBG, and the third and fourth virtual CBGs may be mapped to the second real CBG. Also, as will be appreciated by those skilled in the art, the above example is only an example to aid the reader's understanding, and does not exclude that there may be other predetermined ways of mapping 4 virtual CBGs to 2 real CBGs. For example, first and third virtual CBGs may be mapped to a first real CBG, and second and fourth virtual CBGs may be mapped to a second real CBG.

Also, as shown in the upper part of Fig. 3, when only one TBa is scheduled in this scheduling by the base station, Nmax_CBG_TBi = 4. In this case, 4 virtual CBGs may correspond to 4 real CBGs.

2nd CBG configuration

In other embodiments, for each TB, the base station can determine the number of CBGs actually scheduled based on the size of that TB and the maximum number of CBGs that can actually be scheduled, Nmax_CBG_TBi.

For example, as shown on the right side of FIG. 4, if Nmax_CBG = 4, then in this scheduling the base station schedules two TBs, TBa and TBb, and thus Nmax_CBG_TBi = 2. Taking TBa as an example, assuming that the size of TBa is 5000 and can be divided into 6 Cbs, the number of CBGs actually scheduled is 2 (because the number of CBs > 1). The first, second, and third CBs constitute a first actual CBG, and the fourth, fifth, and sixth CBs constitute a second actual CBG.

In another example, as shown on the left side of FIG. 4, when only one TB is scheduled by the base station in this scheduling, the first and second CBs constitute a first real CBG, and the third and fourth CBs constitute a second The fifth CB constitutes the third actual CBG, and the sixth CB constitutes the fourth actual CBG.

From the foregoing, it can be seen that the "second CBG configuration" has a simpler configuration, but the "first CBG configuration" becomes more robust when the UE misses DCI and may improve retransmission efficiency in some cases. and some examples are given below.

In some embodiments, the number of TBs scheduled by the base station at each point in time may be different, but Nmax_CBG_TBi does not change according to the number of TBs actually scheduled. For example, the maximum number of TBs that can be scheduled by a base station through higher layer signaling is NTB=2. If only one TB is scheduled in the current downlink transmission, then for that TB, Nmax_CBG_TBi = Nmax_CBG_TBi = Nmax_CBG/2, not Nmax_CBG_TBi = Nmax_CBG.

In some embodiments, the number of TBs scheduled at each point in time by the base station may be different. For example, the base station may determine Nmax_CBG_TBi according to the number of TBs actually scheduled for transmission. Accordingly, Nmax_CBG_TBi for each scheduling may be the same or different for different TBs. For the same TB, in one implementation, Nmax_CBG_TBi is determined based on the number of TBs for the transmission, either at retransmission and initial transmission (initial transmission), or at different times of retransmission. In contrast, for the same TB, Nmax_CBG_TBi remains unchanged and is determined based on the number of TBs in the initial transmission of the TB for retransmission and initial transmission (initial transmission) or retransmission in a different time period.

For example, a base station schedules two TBs, TBa and TBb, which are initial transmissions. At this time, Nmax_CBG_TBa = Nmax_CBG_TBb = 2. If TBb is successfully transmitted but TBa transmission fails, the base station only schedules TBa when retransmitting. In this case, Nmax_CBG_TBa = 4.

According to the first CBG configuration, when the base station initially schedules the transmitted TBa, Nmax_CBG_TBa = 2, in which case CB1 to 4 are actually scheduled CBG1 and CB5 to 6 are actually scheduled CBG2. Assuming that the UE fails to demodulate CBG2 but demodulates CBG1 successfully, the base station schedules CBs 5 to 6 when scheduling retransmission of TBa. At this time, Nmax_CBG_TBa = 4. Then, the base station indicates the CBGs scheduled at this time as CBG3 and CBG4, that is, CBs 5 to 6.

According to the second CBG configuration, when the base station schedules initially transmitted TBa, Nmax_CBG_TBa = 2, where CB1 to 3 are actually scheduled CBG1 and CB4 to 6 are actually scheduled CBG2. Assuming that the UE fails to demodulate CBG2 but demodulates CBG1 successfully, the base station schedules CBs 4 to 6 when scheduling retransmission of TBa. At this time, Nmax_CBG_TBa = 4. The CBGs are regrouped, that is, the first and second CBs constitute a first CBG, the third and fourth CBs constitute a second CBG, the fifth CB constitutes a third CBG, and the sixth CB constitutes a fourth CBG. To retransmit CB4-6, the base station indicates that CBGs to be scheduled at this time are CBG2, 3 and 4, that is, CB3-6.

In another example, the base station schedules 1 TB for initial transmission. At this time, Nmax_CBG_TBa = 4. If TBa transmission fails, the base station schedules TB to be retransmitted and schedules the initially transmitted TBb. At this time, Nmax_CBG_TBa = Nmax_CBG_TBb = 2.

According to the first CBG configuration, when the base station schedules initially transmitted TBa, Nmax_CBG_TBa = 4, where the first and second CBs constitute a first actual scheduled CBG, and the third and fourth CBs constitute a second actual scheduled CBG. The 5th CB constitutes the 3rd actual scheduled CBG, and the 6th CB constitutes the 4th actual scheduled CBG. Assume that the UE fails to demodulate CBG2 and successfully demodulates CBG1, 3 and 4. The base station schedules CB3 to 4 when scheduling TBa to be retransmitted. At this time, Nmax_CBG_TBa = 2. Then, the base station indicates the CBGs scheduled at this time as CBG1, that is, CB1 to 4.

According to the 2nd CBG configuration, when the base station schedules initially transmitted TBa, Nmax_CBG_TBa = 4, where the first and second CBs constitute a first actual scheduled CBG, and the third and fourth CBs constitute a second actual scheduled CBG. The 5th CB constitutes the 3rd actual scheduled CBG, and the 6th CB constitutes the 4th actual scheduled CBG. Assume that the UE fails to demodulate CBG2 and successfully demodulates CBG1, 3 and 4. When the base station schedules TBa to retransmit, CB3 to 4 are scheduled. At this time, Nmax_CBG_TBa = 2. The CBGs are regrouped, that is, the first, second, and third CBs constitute the first CBG, and the fourth, fifth, and sixth CBs constitute the second CBG. To retransmit CB3 to 4, the base station indicates that CBGs to be scheduled at this time are CBG1 and CBG2, that is, all CBs.

For example, a base station schedules two TBs, TBa and TBb, which are initial transmissions. At this time, Nmax_CBG_TBa = Nmax_CBG_TBb = 2. If all CBGs of TBb are transmitted successfully but some of the CBGs of TBa are not transmitted successfully, only TBa will be scheduled when the base station schedules retransmission. In this case, Nmax_CBG_TBa = 2.

According to the second CBG configuration, when the base station schedules initially transmitted TBa, Nmax_CBG_TBa = 2, and at this time, CB1 to 3 constitute CBG1 to be actually scheduled, and CB4 to 6 constitute CBG2 to be actually scheduled. Assuming that the UE fails to demodulate CBG2 but successfully demodulates CBG1, the base station schedules CB4 to 6 when scheduling retransmission of TBa. In this case, Nmax_CBG_TBa = 2, and the base station indicates that the scheduled CBG at this time is CBG2.

For another example, a base station schedules two TBs, TBa and TBb, where the two TBa and TBb are initial transmissions. At this time, Nmax_CBG_TBa = Nmax_CBG_TBb = 2. If all CBGs of TBb are successfully transmitted but some of the CBGs of TBa are not successfully transmitted, the base station can schedule retransmission of that part of TBa and new transmission of TBc when scheduling retransmission. In this case, Nmax_CBG_TBa = Nmax_CBG_TBc = 2.

It should be noted that it may happen that the UE misses the DCI scheduling the initial transmission of a certain TB and thus cannot determine Nmax_CBG_TBi during initial transmission. The base station can avoid such confusion through scheduling. For example, the last transmission is of 2 TBs. When the base station can determine that the received HARQ-ACK corresponding to the previous transmission is DTX/DTX, the base station schedules the two TBs again when scheduling the next time point. When the last transmission is transmission of two TBs and the base station can determine that the received HARQ-ACK corresponding to the last transmission was an ACK of CBG for at least one TB, the base station only transmits one TB or both TBs can be scheduled simultaneously.

In another example, the base station schedules 1 TB, TBa, which is an initial transmission. At this time, Nmax_CBG_TBa = 4. If TBa is not transmitted successfully, the base station schedules retransmission of this TB. One way to avoid the increase in the number of bits of HARQ-ACK feedback caused by scheduling both TBs simultaneously is to prevent the base station from scheduling other TBs before TBa is successfully transmitted. This also avoids the problem that the UE misses the DCI that scheduled the initial transmission of TBa, but cannot determine Nmax_CBG_TBa in the initial transmission when receiving the retransmission of DCIs of TBa and other TBs. Unlike this, the base station can simultaneously schedule other TBs such as TBb, and Nmax_CBG_TBa = Nmax_CBG_TBb = 4. To avoid the increase of HARQ-ACK bits, the UE automatically bundles CBG dimensions such that the number of HARQ-ACK bits fed back by the two TBs remains 4. Specifically, refer to the part about HARQ-ACK feedback.

More generally, embodiments of the present disclosure do not limit the manner in which a base station divides one or more TBs into CBs, and do not restrict specific manners in configuring virtual CBGs.

Method 100 may then 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 can generate a DCI including CBG scheduling or configuration information according to the above-described scheme and send it to the UE through a downlink control channel (eg, PDCCH). DCI including CBG scheduling or configuration information generated by the base station may be generated in one of the following ways.

In some embodiments, a base station may independently indicate scheduling information for each TB. For example, each TB has an independent Modulation and Coding Scheme (MCS) indicator, a Redundancy Version (RV) indicator, a New Data Indicator (NDI) indicator, and the like. In some embodiments, there may be one NDI for each TB, or one NDI (or bit information having the same effect) for each CBGs of each TB.

Also, in some embodiments, the base station may indicate scheduling or configuration information for CBGs 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 field) for indicating whether the corresponding CB/CBG is scheduled.

Assuming that Nmax_CBG = 4 and NTB = 2 is a scheduling point, Nmax_CBG_TBi = 2. For each of the two CBGs for each TB, there is a 1-bit field to indicate whether the base station has scheduled this CBG or not. In some embodiments, if that 1 bit is toggled based on that bit in the initial transmission scheduling the same TB, then this CBG is not scheduled. In some embodiments, if this 1 bit does not change based on that bit of the initial transmission scheduling the same TB, it indicates that this CBG is scheduled. In some embodiments, that 1 bit indicates that the CBG is scheduled or unscheduled according to a predefined value of 0 or 1.

For initial transmission, this bit cannot be used to indicate whether the corresponding CB/CBG is scheduled or not, but rather can be used to indicate that this TB is initial transmission. For example, when all bits of all CBGs of a TB are toggled relative to this bit in the DCI of the initial transmission of the previous TB that scheduled the same HARQ process, it indicates that this TB is the initial transmission, otherwise it is a retransmission indicates that That is, in the initial transmission of one TB, each of the bits of each CBG may have the same value, and all bits are toggled based on the bits of the initial transmission of the previous TB that scheduled the same HARQ process.

The following describes the case where the number of TBs is different for the current transmission and the current initial transmission:

(a) For example, in the last initial transmission, the base station only scheduled one new TBa with 4 CBGs. However, in the current transmission, the base station schedules two new TBs, TBb and TBc, and there are 2 bits for the 2 CBGs of each TB, i.e. 4 bits in total. Assuming that TBa corresponds to TBb (i.e., the HARQ process is the same), 2 bits of TBb toggle relative to 4 bits of TBa, and 2 bits of TBc toggle relative to those of the previous TB in the same HARQ process. do.

(b) For example, in the last initial transmission, the base station schedules two new TBs, TBb and TBc, but in the current transmission, the base station only schedules one new TBa. Assuming that TBa corresponds to TBb (eg, the HARQ process is the same), in the same way, 4 bits of TBa are toggled based on 2 bits of TBb.

Also, in some embodiments, each CB / CBG has a separate field for indicating whether the corresponding CB / CBG is scheduled when the DCI also includes the NDI for the TB, and whether the TB is initial transmission or retransmission It is indicated by the TB's NDI.

(2) Each CB/CBG indicates whether the corresponding CB/CBG needs to empty its corresponding buffer by explicitly indicating whether the corresponding CB/CBG needs to empty its corresponding buffer, or by indicating whether the corresponding CB/CBG needs to empty its corresponding buffer. CBG can have an independent field to indicate implicitly, or each TB uses 1 bit to indicate whether the corresponding CB/CBG scheduled by the same DCI needs to clear its corresponding buffer, or , multiple TBs share the same 1 bit to indicate whether the corresponding CB/CBG scheduled by the same DCI needs to empty its corresponding buffer. By toggling this field based on the last transmission that scheduled the same TB , may indicate that the CB/CBG is a new CBG or a CBG that may need to clear the buffer, and a non-toggled field may indicate that the CB/CBG is a CBG that does not require buffer clearing.

However, it should be noted that the CBs included in the current CBG and the CBs included in the last transmitted CBG are different when the buffer is emptied. For example, CB1 to 4 in the buffer are the last transmitted CBG1, and the current transmission receives a command to clear the buffer for the CB of CBG2. In this case, CBG2 contains only CB3 to 4, only the buffers of CB3 to 4 are emptied, and CB1 to 2 remain in the buffer. If a command to empty the buffers of CBs of CBG1 is received and CBG1 contains CB1 to 4 at this time, the buffers of CB1 to 4 should be cleared.

In addition, in step S130, a downlink allocation index (DAI) may be further included in DCI including CBG scheduling/configuration information generated by the base station. In the same embodiments, the DAI may include a first type of DAI and/or a second type of DAI.

The first type of DAI, also known as counter DAI, represents one of the following:

(1) The sum of the number of scheduled CBGs up to the currently scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window, or feedback sum of the number of HARQ-ACK bits to do;

(2) Current scheduled downlink time unit (eg, downlink time unit Ti) and/or last downlink time unit and/or current carrier (eg, current carrier Ci) previous carrier in HARQ-ACK feedback bundling window the sum of the number of CBGs scheduled up to + 1, or the sum of the number of HARQ-ACK bits to be fed back + 1;

(3) Up to the current scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window and/or the downlink scheduled time unit the sum of the maximum number of CBGs of the carrier, or the sum of the number of HARQ-ACK bits to be fed back; or

(4) The current scheduled downlink time unit (eg, downlink time unit Ti) and/or the last downlink time unit and/or current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window. The sum of the downlink time unit scheduled up to the carrier and/or the maximum number of CBGs of the downlink carrier +1, or the sum of the number of HARQ-ACK bits to be fed back +1.

The HARQ-ACK feedback bundling window is the set of all carriers and/or the set of all downlink time units having HARQ-ACK/NACKs that can be fed back simultaneously within the same uplink time unit. This disclosure does not limit the length of downlink time units, eg, downlink slots, mini-slots, or OFDM symbols. In some embodiments, the first type DAI is counted as a granularity of the number of CBGs. When set to the TB scheduling mode, one TB may be considered to correspond to one CBG. When a carrier configured for TB scheduling mode is scheduled and the base station does not configure spatial dimension bundling, the number of CBGs scheduled for this carrier can be considered a fixed value. For example, the number of CBGs scheduled for this carrier may correspond to the maximum number of TBs Nmax_TB = 2 that can be supported in MIMO mode. Alternatively, the number of CBGs scheduled for this carrier may correspond to the number of TBs actually scheduled.

In the above (3) or (4), the maximum number of CBGs Nmax_CBG of each scheduled downlink time unit and/or downlink carrier may be different from each other. For example, the base station sets different Nmax_CBGs for different downlink carriers. A special case is when the TB scheduling mode is set for some of the carriers. When the base station does not configure bundling of spatial dimensions, Nmax_CBG = 2 for those carriers. When one TB is scheduled, the HARQ-ACK bits of another TB are dummy bits, and when the CBG scheduling mode is configured for some of the carriers, specific values of Nmax_CBG of each carrier configured through the CBG scheduling mode may be different from each other. there is. According to the method of the present invention, values of Nmax_CBG HARQ-ACKs are determined; Or, for a carrier configured via TB scheduling mode, Nmax_CBG depends on the number of actually scheduled TBs; Nmax_CBG = 1 if only one TB is scheduled and Nmax_CBG = 2 if two TBs are scheduled. It is easy to see that DAI of the first type is counted at the granularity of the number of CBGs, and the count of TB dimensions is included in the count of CBG dimensions. In this case, regardless of the TB scheduling mode or the CBG scheduling mode, the first type of DAI is the number of HARQ-ACK bits to be provided by all TBs in each PDSCH regardless of whether one TB is scheduled or two TBs are scheduled Calculate

When the base station configures the bundling of the spatial dimension, Nmax_CBG = 1 for the carrier for which the TB scheduling mode is set. If two TBs are scheduled, the HARQ-ACKs of the two TBs are calculated through an AND operation for the carrier for which the CBG scheduling mode is set, and if two TBs are scheduled, according to the method of the present invention, one The HARQ-ACK of Nmax_CBG bits is fed back regardless of whether a TB of TB is scheduled or two TBs are scheduled.

For example, it can be assumed that the length of time of the HARQ-ACK feedback bundling window is one downlink time unit, and there are 3 carriers in the frequency domain dimension. All three carriers are configured to support scheduling of up to 2 TBs. In one downlink time unit, the base station can schedule PDSCH on two of the carriers, where carrier 1 can be configured with a CBG-based scheduling scheme and the maximum number of CBGs Nmax_CBG_C1 = 4, and carrier 2 is TB-based It can be set as a scheduling mode and Nmax_CBG_C2 = Nmax_TB = 2. In addition, carrier 3 may be configured in a CBG-based scheduling scheme, and the maximum number of CBGs is Nmax_CBG_C3 = 6. If carrier 1 schedules 2 TBs, the total number of CBGs scheduled by 2 TBs is 3; Assume that if carrier 1 schedules 1 TB, the total number of scheduled CBGs is 6. At this time, as shown in FIG. 5, according to the method (1), the first type DAI of carrier 1 = 3, which indicates that carrier 1 schedules three CBGs, and the first type DAI of carrier 3 = 9, which indicates that carriers 1 to 3 schedule a total of 9 CBGs. When the UE receives the first type DAI of carrier 3, the UE can know that the base station has not scheduled carrier 2. According to the method of (4), the first type of carrier 1 DAI = 9 indicates that carrier 1 is the first scheduled carrier, the first type of carrier 3 DAI = 5 indicates carrier 1 to carrier 2, and scheduling by the base station The total sum of the maximum number of CBGs corresponding to each carrier is 4. When the UE receives the first type DAI of carrier 3, the UE can know that the base station has not scheduled carrier 2.

As another example, if carrier 1 schedules 2 TBs, the total number of CBGs scheduled by these 2 TBs is 3, carrier 2 schedules 1 TB and carrier 3 schedules 1 TB , it is assumed that the total number of scheduled CBGs is 6. At this time, according to the method of (1), the first type DAI of carrier 1 = 3, which indicates that carrier 1 schedules 3 CBGs; The first type of carrier 2 DAI=5, which indicates that a total of 5 CBGs are scheduled for carrier 1 to carrier 2; The first type DAI of carrier 2 = 11, which indicates that a total of 11 CBGs are scheduled for carrier 1 to carrier 3. Assume that the UE fails to receive the PDCCH of carrier 2 but receives the PDCCHs of carrier 1 and carrier 3. Here, when receiving the first type DAI of carrier 3, the UE can know that it missed the PDCCH of carrier 2 and can determine that carrier 2 actually schedules up to two CBGs. Note that a base station can schedule 1 TB or 2 TBs. However, regardless of how many TBs are scheduled by the base station, a maximum of 2 CBGs are considered scheduled.

According to the method (4), as shown in FIG. 6, the first type DAI of carrier 1 = 1, the first type DAI of carrier 2 = 5, and the first type DAI of carrier 3 = 7. Assume that the UE fails to receive the PDCCH of carrier 2 but receives the PDCCHs of carrier 1 and carrier 3. Here, when receiving the first type DAI of carrier 3, the UE can know that it has missed the PDCCH of carrier 2. Assuming that the UE fails to receive the PDCCH of carrier 1 and receives the PDCCHs of carrier 2 and carrier 3, the UE can know that it missed the PDCCH of carrier 1 when receiving the first type DAI of carrier 2 . In addition, the UE may determine that carrier 2 schedules only 1 TB according to the PDCCH of carrier 2, but the UE still needs to generate HARQ-ACK for 2 TBs when generating HARQ-ACK. At this time, 1 The HARQ-ACK of the TB is determined to be ACK/NACK according to the decoding result of the PDSCH, and the HARQ-ACK of the remaining TBs are dummy bits that can be fixed values, such as NACK/DTX. In contrast, assuming that Nmax_CBG for a TB-scheduled carrier is determined according to the number of scheduled TBs, in this example, the first type DAI of carrier 1 = 1, the first type of carrier 2 DAI = 5, The first type of carrier 3 DAI=7. Assume that the UE fails to receive the PDCCH of carrier 2 but receives the PDCCHs of carrier 1 and carrier 3. In this case, when generating HARQ-ACK of carrier 2, the UE only needs to generate HARQ-ACK of 1 TB.

In some embodiments, the first type DAI is a bit of ACK/NACK for the current downlink time unit (eg, downlink time unit Ti) and the downlink carrier (eg, downlink carrier Ci) in the HAQR-ACK codebook. Can be used to calculate the starting point of a position.

Corresponding to (2) or (4), the starting point of the bit position of the ACK/NACK for the downlink time unit Ti and the downlink carrier Ci in the HARQ-ACK codebook may be the same as the corresponding DAI. In some embodiments, the bit length of ACK/NACK for downlink time unit Ti and downlink carrier Ci is the number of scheduled CBGs (corresponding to (2)) or the maximum number of CBGs (corresponding to (4)) can be a number.

Corresponding to (1) or (3), the starting point of the bit position of ACK/NACK for the downlink time unit Ti and the downlink carrier Ci in the HARQ-ACK codebook is the corresponding DAI - downlink time unit Ti and downlink It may correspond to the bit length of ACK/NACK of carrier Ci + 1. In some embodiments, the bit length of ACK/NACK for downlink time unit Ti and downlink carrier Ci is the number of scheduled CBGs (corresponding to (1)) or the maximum number of CBGs (corresponding to (3)) can be a number.

In some embodiments, when the UE feeds back the ACK/NACK of the downlink time unit Ti and the downlink carrier Ci, if the UE is set to CBG scheduling mode, the ACK/NACK of the CBG in the first scheduled TB is first mapped, and the ACK/NACK of the CBG in the second scheduled TB (when two TBs are scheduled) is mapped next.

In some embodiments, corresponding to (1) or (2), when mapping the ACK/NACKs of each CBG in one TB, the ACK/NACK of each scheduled CBG corresponds to the number of CBGs actually scheduled by the TB It is mapped in ascending order according to the indices.

In some embodiments, corresponding to (3) or (4), when mapping the ACK/NACKs of each CBG in one TB, the ACK/NACK of each CBG is in ascending order according to the indexes of the CBGs in the TB In this case, the ACK/NACK of the scheduled CBG is determined according to the decoding result of the CBG, and the ACK/NACK of the non-scheduled CBG is a dummy bit for which a predetermined value can be used. Also, the total length of ACK/NACK bits for all TBs of the downlink time unit Ti and the downlink carrier Ci may be Nmax_CBG.

When the TB scheduling mode is set, corresponding to (1) to (4), ACK/NACK of the 1st TB may be mapped first, and then ACK/NACK of the 2nd TB may be mapped. ACK/NACK of a scheduled TB is determined according to the decoding result of the TB. ACK/NACK of unscheduled TB is a dummy bit for which any value can be used.

The second type of DAI, also referred to as total DAI, is the total number of bits of the HARQ-ACK codebook, or the current downlink within the HARQ-ACK feedback bundling window in the first downlink time unit among all scheduled downlink time units. The total number of scheduled CBGs of all scheduled carriers up to the link time unit, or all scheduling from the first downlink time unit among all scheduled downlink time units to the current downlink time unit within the HARQ-ACK feedback bundling window. may indicate the total number of the maximum numbers of CBGs of the carriers that have been received, or the sum of the number of corresponding HARQ-ACK bits to be fed back.

For example, within one downlink time unit, PDSCH is scheduled on two carriers, where carrier 1 is configured in CBG-based scheduling mode with the maximum number of CBGs Nmax_CBG = 4, and carrier 2 is configured in TB-based scheduling mode. is set Assume that carrier 1 schedules 2 TBs, and the total number of CBGs scheduled by the 2 TBs is 3. If the second type DAI represents the total number of scheduled CBGs of all carriers scheduled from the first downlink time unit to the current downlink time unit among all scheduled downlink time units corresponding to a given uplink time unit, The second type DAI of carrier 1 and carrier 2 is 3 + 2 = 5. If the second type DAI indicates the maximum number of CBGs of all carriers scheduled from the first downlink time unit to the current downlink time unit among all scheduled downlink time units corresponding to a given uplink time unit, carrier 1 and the second type DAI of carrier 2 is 4 + 2 = 6.

It should be noted that in the first type DAI or the second type DAI, there may be cases in which bit states correspond to values of several DAIs due to bit overhead limitations. For example, in the LTE system, DAI contains only 2 bits, but the actual value represented by DAI is 1 to 32 or more. In this case, the modulo format is usually adopted. For example, DAI = "00" indicates that the value of DAI is 1, 5, 9,..., 4 * (M-1) +1.

Another method for determining the total number of bits of the HARQ-ACK codebook may not be based on DAI. The size of the HARQ-ACK codebook and the bit arrangement order are the number of semi-statically configured carriers, the HARQ-ACK feedback bundling window, and the number of HARQ-ACK bits of the downlink time unit Ti on the quasi-statically configured downlink carrier Ci. is determined based on In this case, in the carrier configured for TB scheduling, the number of HARQ-ACK bits is the maximum number of TBs that can be transmitted, for example, 1 bit when the downlink carrier Ci is configured to have only one TB at most , and the case where the downlink carrier Ci is configured to have only a maximum of 2 TBs is 2 bits, regardless of how many TBs are actually scheduled. For a carrier configured for CBG scheduling, it is fixed to Nmax_CBG_i regardless of the number of TBs.

The above embodiments have been mainly described from the point of view of a base station. For those skilled in the art, according to the above, in order to ensure correct reception by the UE, the UE determines the received DCI, determines the CBG information in it, and determines whether it is for one TB or multiple TBs. Same as the base station to determine whether or not each CBG indication in DCI corresponds to which CBG of which CB, how the received PDCCH is divided into CBs, and how the received PDSCH is combined into CBGs. or follow the corresponding standards and methods. For brevity here, I will not repeat it. In addition, in order to ensure accurate feedback of the HARQ-ACK, the UE determines the information of the first type DAI and/or the second type DAI in the received DCI according to the same or corresponding criterion and method as the base station, and HARQ-ACK feedback may be determined according to information of type 1 or type 2 Dai, or HARQ-ACK feedback may be determined according to a predetermined rule. For example, the number of HARQ-ACK bits fed back in each scheduling is Fixed as Nmax_CBG. The details are not repeated here for the same reasons.

By using the solution according to the above embodiment, the length of DCI at each scheduling time may not change according to the number of scheduled TBs, which reduces the complexity of blindly detecting the PDCCH by the UE. In addition, when the UE performs HARQ-ACK feedback, since the number of HARQ-ACK bits corresponding to the scheduled PDSCH does not change according to the number of scheduled TBs, HARQ-ACK feedback overhead is reduced. In addition, this is when one or more PDSCHs are missed by the UE when HARQ-ACKs of PDSCHs of multi-carriers or HARQ-ACKs of PDSCHs of several downlink time units are fed back within one uplink time unit, TB of missing PDSCHs It avoids a situation where the size of the HARQ-ACK codebook or its arrangement order cannot be determined due to uncertainty about the number of .

A flow diagram of an example method for feedback HARQ-ACK/NACK will be described in detail below in conjunction with FIG. 2 and other figures. 2 is a flow diagram of an exemplary method 200 for feedback HARQ-ACK/NACK according to one embodiment of the present disclosure. As shown in FIG. 2 , method 200 may begin at step S210. In step S210, the UE may receive downlink control signaling from the connected base station. Subsequently, in step S220, the UE may generate a HARQ-ACK codebook based on downlink control signaling and a decoding result of downlink transmission corresponding to the downlink control signaling. In step S230, the UE may provide HARQ-ACK corresponding to downlink transmission to the base station according to the generated HARQ-ACK codebook.

In some embodiments, the UE may include a first and/or second type DAI included in the downlink control signaling (where the first and/or second type DAI is the first and/or second type DAI described above with respect to FIG. 1 ). It should be noted that it may be different from the second type DAI, and for details, refer to the definitions of the first and second type DAI described below) and according to the selected reference TB, the size of the HARQ-ACK codebook, and Positions of ACK/NACK bits of PDSCH scheduled by downlink control signaling in the HARQ-ACK codebook can be determined.

In some embodiments, if the carrier on which the current downlink time unit is scheduled is configured in an operating mode for scheduling at most one TB, e.g., in a single-antenna Single Input Multiple Output (SIMO) transmission mode, the reference TB is It can be one scheduled TB corresponding to DAI. That is, it may be understood that there is no need to determine the reference TB.

In some other embodiments, the carrier on which the current downlink time unit is scheduled is set in an operating mode capable of scheduling at most one TB, and the carrier on which the current downlink time unit is scheduled is in a TB scheduling mode If set, any of the TBs may be selected as the reference TB. For example, the first TB may be selected as the reference TB corresponding to the DAI. That is, it may be understood that there is no need to determine the reference TB.

In yet other embodiments, the carrier on which the current downlink time unit is scheduled is configured in an operating mode capable of scheduling at most one or more TBs, and the carrier on which the current downlink time unit is scheduled is in CBG scheduling mode , which TB actually schedules the maximum number of CBGs is determined according to the downlink control information, and the TB is determined to be the reference TB corresponding to the DAI. In some embodiments, if the number of actual scheduled CBGs in multiple TBs is the same, any one of multiple TBs may be selected to correspond to the DAI.

In yet other embodiments, the carrier on which the current downlink time unit is scheduled is configured in an operating mode capable of scheduling at most one or more TBs, and the carrier on which the current downlink time unit is scheduled is in CBG scheduling mode If the number of HARQ-ACK bits that can be fed back by each TB is the same, it is determined according to the maximum number of CBGs configured. For example, any one of the TBs may be selected as a reference TB corresponding to DAI.

In some embodiments, the number of ACK/NACK bits fed back by the UE in the PDSCH scheduled by downlink control signaling may be Nmax_TB * NCBG_ref, where Nmax_TB may be scheduled through the PDSCH in the configured operation mode. is the maximum number of TBs in Usually Nmax_TB can be 2. For carriers configured in CBG scheduling mode, NCBG_ref may be the number of CBGs actually scheduled by reference TB corresponding to DAI. For carriers configured in TB scheduling mode, NCBG_ref may be 1. For carriers configured in the CBG scheduling mode, the number of HARQ-ACK bits that each TB can feed back may correspond to the maximum number of configured CBGs, Nmax_CBG, and NCBG_ref may be Nmax_CBG.

In contrast, regardless of whether the scheduled carrier is set to operate in the CBG scheduling mode or the TB scheduling mode, both the first type and/or the second type of DAI may use one fixed TB as a reference. can In addition, the number of ACK/NACK bits fed back by the UE for the PDSCH scheduled by downlink control signaling may be Nmax_TB * Nmax_CBG_ref. For a carrier configured in CBG scheduling mode, Nmax_CBG_ref may be the maximum number of CBGs that can be scheduled by a reference TB corresponding to DAI. For carriers configured in TB scheduling mode, Nmax_CBG_ref may be 1.

Unlike the embodiment shown in FIG. 1, in the embodiment shown in FIG. 2, Nmax_CBG_ref or NCBG_ref is for one TB. When multiple TBs are scheduled on one PDSCH, for example, when two TBs are scheduled, the sum of the maximum number of CBGs of two TBs within one PDSCH is Nmax_CBG_ref * 2.

Similarly, when two TBs are scheduled, the number of CBGs actually scheduled for two TBs in one PDSCH is NCBG_TB1 + NCBG_TB2, where NCBG_ref = max (NCBG_TB1, NCBG_TB2).

For DCI scheduling such a PDSCh, each CBG indication for each TB may be independent. For example, with two TBs, each TB has one bit indication for each CBG. For example, if Nmax_CBG = Nmax_CBG_ref = 4, there is an 8-bit indication regardless of whether the base station is actually scheduling 1 TB or 2 TBs. When the base station schedules only one TB, the 4 bits of the unscheduled one TB do not represent the information of that TB, and are used for other purposes or are just dummy bits. In DCI scheduling such a PDSCH, the indication for each CBG of each TB may be used in combination, and is not limited in the present disclosure.

In the embodiment shown in FIG. 2 , the first type DAI, which may also be referred to as a counter DAI, may represent one of the following:

(1) Up to the currently scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window, respectively, the scheduled downlink time unit and/or down the sum of the number of CBGs (NCBG_ref) actually scheduled by the reference TB of the link carrier;

(2) the current scheduled downlink time unit (eg, downlink time unit Ti) and/or the latest downlink time unit and/or the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window the sum of the number of CBGs actually scheduled by the downlink time unit each scheduled up to the carrier and/or the reference TB of the downlink carrier + 1;

(3) Up to the current scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window and/or the downlink scheduled time unit the sum of the maximum number of CBGs (Nmax_CBG_ref) of the reference TB of the carrier; and

(4) the current scheduled downlink time unit (eg, downlink time unit Ti) and/or the latest downlink time unit and/or the current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window The sum of the maximum number of CBGs of the downlink time unit scheduled up to the carrier and/or the reference TB of the downlink carrier + 1.

In the embodiment shown in FIG. 2, the second type DAI is the total number of bits of the HARQ-ACK codebook; or the total number of scheduled CBGs of all carriers scheduled from the first downlink time unit of all scheduled downlink time units to the current downlink time unit within the HARQ-ACK feedback bundling window; Or it can be used to indicate the total number of maximum numbers of CBGs of all scheduled carriers from the first downlink time unit of all scheduled downlink time units to the current downlink time unit in the HARQ-ACK feedback bundling window.

In some embodiments, the total number of bits of the HARQ-ACK codebook or the total number of scheduled CBGs or the total number of CBGs is the second type DAI and It may correspond to a product of Nmax_TB. In some embodiments, when the base station configures the bundling of the spatial dimension, the total number of bits of the HARQ-ACK codebook or the total number of scheduled CBGs or the maximum number of CBGs may correspond to the second type DAI. .

In some embodiments, the first type DAI may be used to calculate the starting point of the bit position of ACK/NACK bits for the currently scheduled downlink time unit in the HARQ-ACK codebook. For example, if Nmax_TB = 2 corresponding to (2) or (4) in some embodiments when the base station does not configure the bundling of the spatial dimension, the downlink time unit Ti and the downlink carrier in the HARQ-ACK codebook The starting point of the bit position of the ACK/NACK bits for Ci may correspond to the corresponding DAI-1 multiplied by 2. Corresponding to (1), the starting point of the bit position of the ACK/NACK bits for the downlink time unit Ti and the downlink carrier Ci in the HARQ-ACK codebook is the corresponding DAI - of the downlink time unit Ti and the downlink carrier Ci NCBG_ref, which can then correspond to multiplication by 2 and addition of 1. Corresponding to (3), the starting point of the bit positions of the ACK/NACK bits for downlink time unit Ti and downlink carrier Ci in the HARQ-ACK codebook is the corresponding DAI - downlink time unit Ti and downlink carrier Ci Nmax_CBG_ref, then may correspond to multiplying by 2 and adding 1.

In addition, corresponding to (2) or (4) in other embodiments, the start position of the bit position of the ACK/NACK bits for the downlink time unit Ti and the downlink carrier Ci in the HARQ-ACK codebook is When configuring the bundling of a dimension, it can be the same as the corresponding DAI. Corresponding to (1), the starting point of the bit position of the ACK/NACK bits for the downlink time unit Ti and the downlink carrier Ci in the HARQ-ACK codebook is the corresponding DAI - of the downlink time unit Ti and the downlink carrier Ci It may correspond to NCBG_ref + 1. Corresponding to (3), the starting point of the bit positions of the ACK/NACK bits for downlink time unit Ti and downlink carrier Ci in the HARQ-ACK codebook is the corresponding DAI - downlink time unit Ti and downlink carrier Ci It may correspond to Nmax_CBG_ref + 1.

If the base station does not configure the bundling of the spatial dimension, when the UE feeds back the ACK/NACK of the downlink time unit Ti and the downlink carrier Ci, the ACK/NACK of the CBG in the 1st TB may be mapped first, and then ACK/NACK of CBG within 2TB is mapped.

Corresponding to (1) or (2), for each TB, the ACK/NACK bits of each scheduled CBG may be mapped sequentially in ascending order according to the indexes of the actually scheduled CBG. When the numbers of CBGs scheduled by the two TBs are different, a dummy bit may be transmitted for the TB with the smaller number of CBGs, so that the number of ACK/NACK bits of the TBs is equal to NCBG_ref. For example, 2 TBs are scheduled, CBGs 1, 2 and 3 are scheduled by TBa, and CBGs 2 and 4 are scheduled by TBb. At this time, NCBG_ref = 3 and 6-bit ACK/NACK is fed back. First, the ACK/NACK of the three CBGs of TBa are mapped, the ACK/NACK bits of the second and fourth CBGs of TBb are mapped next, and finally a dummy bit of 1 bit is mapped.

Corresponding to (3) or (4), when mapping ACK/NACKs of each CBG in one TB, the ACK/NACK bits of each CBG may be sequentially mapped in ascending order according to the CBG index of the TB . ACK/NACK of the scheduled CBG is determined according to the decoding result of the CBG. ACK/NACK of an unscheduled CBG may be a dummy bit for which a predetermined value can be used, and accordingly, the number of ACK/NACK bits of each TB corresponds to Nmax_CBG_ref Corresponding to (1) to (4), scheduling ACK/NACK of TBs that have not been checked may be dummy bits for which a predetermined value may be used.

In addition, if the base station sets the bundling of the spatial dimension, when the UE feeds back the ACK / NACK of the downlink time unit Ti and the downlink carrier Ci, if the TB scheduling mode is set, the ACK / NACK of each scheduled TB Bits can be logically multiplied. Alternatively, ACK/NACKs for unscheduled TBs may be configured as ACKs, and ACK/NACKs for each TB may be ANDed. If the CBG scheduling mode is set, ACK/NACKs scheduled in each TB and having the same CBG index can be ANDed, that is, unscheduled CBGs do not participate in ANDing. At this time, the number of ACK/NACK bits fed back by the UE for the PDSCH scheduled by downlink control signaling is Nmax_TB * Nmax_CBG_ref, where Nmax_TB = 1. Correspondingly, in a more reasonable way, when the configured CBG scheduling mode adopts spatial dimension bundling, and when two TBs are scheduled, the UE determines the downlink scheduling signaling indicating whether the corresponding CB/CBG is scheduled or not. It can be considered that the bits are common for two TBs, i.e. there is only one set of bits representing CB/CBG and there is no independent CB/CBG scheduling indication for those two TBs.

Bundling of spatial dimensions can be set through signaling, which can be applied for both TB scheduling mode and CBG scheduling mode. Alternatively, bundling of spatial dimensions can be independently set through two signaling. Or, there is only one signaling for TB scheduling mode, and as default for CBG scheduling mode it indicates that it requires bundling of spatial dimensions.

Corresponding to (3) or (4), ACK/NACKs scheduled in each TB and having the same CBG index may be ANDed, that is, unscheduled CBGs do not participate in ANDing. For CBGs not scheduled within each TB, ACK/NACK may be a dummy bit. For example, if 2 TBs are scheduled and Nmax_CBG = 4, TBa schedules #1 and #3 CBGs, and TBb schedules #1 and #2 CBGs. The UE generates a total of 4 bits of ACK/NACK corresponding to each of the 4 CBGs. The 1st bit of ACK/NACK is the result of the AND operation of ACK/NACKs for TBa #1 CBG and TBb #1 CBG, and the 2nd bit of ACK/NACK is ACK/NACK for TBb #2 CBG, ACK The third bit of /NACKs is the ACK/NACK of TBb #3 CBG, and the fourth bit is a dummy bit. In contrast, ACK/NACKs of unscheduled CBGs are ACKs, and ACK/NACKs of CBGs having the same CBG index within each TB may be ANDed.

Corresponding to (1) or (2), for each TB, a virtual CBG index j may be obtained in ascending order according to the indices of CBGs that are actually scheduled. At this time, according to the virtual CBG index, ACKs/NACKs of CBGs having the same CBG index in each TB may be logically multiplied. Alternatively, ACK/NACKs of CBGs actually scheduled with the same CBG index within each TB may be logically multiplied. If the actual scheduled CBG indices by each TB are different, the indices of the actually scheduled CBGs are sorted in ascending order according to the indices of the actually scheduled CBGs, so as to obtain the virtual CBG index j, and within each TB ACK/NACKs of CBGs having the same CBG index are logically multiplied according to the virtual CBG index.

For example, TBa schedules CBG #1, CBG #3, and #4, and TBb schedules CBG #1, CBG #2, and CBG #4 for two TBs. Then, 3-bit ACK/NACK is fed back, where the first bit of the HARQ-ACK codebook may be a logical product of ACK/NACK of CBG #1 of TBa and ACK/NACK of CBG #1 of TBb, and the second bit may be a logical product of ACK/NACK of CBG #4 of TBa and ACK/NACK of CBG #4 of TBb, and the third bit is the ACK/NACK of CBG #3 of TBa and ACK/NACK of CBG #2 of TBb. It can be a logical product.

For example, assuming that the bundling of the spatial dimension is not set, the time length of the HARQ-ACK feedback bundling window is 1 downlink time unit, and the frequency domain dimension has 3 carriers. In one downlink time unit, the base station can schedule PDSCH on two of the carriers, where carrier 1 is configured with CBG-based scheduling scheme and the maximum number of CBGs Nmax_CBG_C1 = 4, and carrier 2 is TB-based scheduling mode is set to Nmax_CBG _C2 = 1. Also, carrier 3 is configured to be based on the CBG scheduling mode, and the maximum number of CBGs is Nmax_CBG_C3 = 6. Assume carrier 1 schedules 2 TBs, where TBa schedules 1 CBG (eg #3) and TBb schedules 2 CBGs (eg #1 and #2).

Then, according to method (1) or (2), the TB corresponding to DAI may be TBb and NCBG_ref_C1 = 2. The TB corresponding to the DAI is either one such as TBa according to method (3) or (4) (selecting TBb or TBa is perfectly equivalent since the maximum number of CBGs configured by the base station is the same for each TB) , and Nmax_CBG_C1 = 4. Carrier 2 schedules 1 TBc. According to methods (1) to (4), the TB corresponding to DAI may be TBc, NCBG_ref_C2 = 1, and Nmax_CBG_C2 = 1.

According to the method (1), as shown in FIG. 7, the first type DAI of carrier 1 may be 2, the first type DAI of carrier 2 may be 3, and the second type DAI of carrier 1 and carrier 2 may be 2. Type DAI may be 3. The size of the HARQ-ACK codebook fed back by the UE may have 6 bits.

In some embodiments, carrier 1 uses 4 bits, where TBa has 2 bits of ACK/NACK, and the first bit in the HARQ-ACK codebook is determined according to the detection result of the scheduled CBG. The second bit is a dummy bit. TBb has 2 bits of ACK/NACK, and bits 3 and 4 in the HARQ-ACK codebook are determined according to a scheduled CBG detection result.

In some embodiments, carrier 2 uses 2 bits, TBc has 1 bit of ACK/NACK, the 5th bit in the HARQ-ACK codebook is determined according to the detection result of the scheduled TBc, and the HARQ-ACK codebook My 6th bit is a dummy bit.

According to method (2), the first type DAI of carrier 1 may be 1, the first type DAI of carrier 2 may be 3, and the second type DAI of carrier 1 and carrier 2 may be 3. The ACK/NACK bitmap may be the same as the ACK/NACK bitmap of (1).

According to method (3), in the example of FIG. 7, if Nmax_CBG_C1 represents the maximum number of CBGs for one PDSCH or the number of bits of HARQ-ACKs fed back by one PDSCH, when two TBs are scheduled, each It is assumed that a TB has 4 CBGs, and inner CBG dimension bundling is performed within each TB. As shown in FIG. 9, the first and second CBGs of TBa are bundled, the third and fourth CBGs of TBa are bundled, the first and second CBGs of TBb are bundled, and the third and fourth CBGs of TBb are bundled do. TBb or TBa can be selected as the reference TB, where the first type DAI for carrier 1 is 2. The first type DAI of carrier 2 is 3, and the second type DAI of carrier 1 and carrier 2 is 3. The size of the HARQ-ACK codebook fed back by the UE has 6 bits. For carriers in the CBG scheduling mode that actually schedules 2 TBs and carriers in the TB scheduling mode, the counts of the first type DAIs are the counts of the reference TB, but carriers in the CBG scheduling mode that actually schedules 1 TB , it is easy to see that the counts of DAIs are the number of CBGs for this TB divided by 2. In another situation, as shown in Figure 10, carrier 1 schedules at most 2 TBs, and carrier 1 actually schedules only TBa, i.e., the 3rd CBG. At this time, the HARQ-ACK fed back by the TB has 4 bits. The third bit determines HARQ-ACK according to the decoding result, and the other three bits may send dummy bits. The first type DAI of carrier 1 is 2, and the second type DAI of carrier 1 is 3. The first type DAI of carrier 2 is 3, and the second type DAI of carrier 2 is 3. Its advantage is that it can effectively reduce the overhead of DAI. The size of the HARQ-ACK codebook is the second type DAI *2. If Nmax_CBG_C1 = 4 represents the maximum number of CBGs for one TB in the example of FIG. 7, the first type DAI of carrier 1 may be 4, the first type DAI of carrier 2 may be 5, and carrier 1 and carrier The second type DAI of 2 may be 5. The size of the HARQ-ACK codebook fed back by the UE has 10 bits. In some embodiments, carrier 1 uses 8 bits and TBa has 4 bits of ACK/NACK. The third bit in the HARQ-ACK codebook determines the ACK/NACK value according to the detection result of the scheduled #3 CBG, and bits 1, 2 and 4 are dummy bits. TBb has 4-bit ACK/NACK, bits 4 and 6 in the HARQ-ACK codebook determine ACK/NACK values based on the detection results of scheduled #1 CBG and #2 CBG, and bits 7 and 8 are It is a dummy bit. In some embodiments, carrier 2 uses 2 bits and TBc has 1 bit of ACK/NACK. The 9th bit in the HARQ-ACK codebook determines the ACK/NACK value according to the detection result of the scheduled TBc, and the 10th bit in the HARQ-ACK codebook is a dummy bit.

According to the method (4), as shown in FIG. 8, Nmax_CBG_C1 = 4 represents the maximum number of CBGs of one TB, the first type DAI of carrier 1 may be 1, and the first type DAI of carrier 2 may be 5, and the second type DAI of carrier 2 may be 5. The total number of bits of the HARQ-ACK/NACK codebook is 10.

It should be noted that in the first type or the second type DAI, there may be cases in which bit states correspond to values of several DAIs due to bit overhead limitations. For example, in an LTE system, DAI contains only 2 bits, but the actual value represented by DAI may be 1 to 32 or more. In this case, the modulo format is usually adopted. For example, DAI = "00" indicates that the value of DAI is 1, 5, 9, ..., 4 * (M-1) +1. In another example, the value of DAI can be determined by taking the greatest common divisor of the maximum number of HARQ-ACK bits that can be sent by each PDSCH as a step. Assume that Nmax_CBG can have values 2 and 4. At this time, the step is 2. The second type DAI = "000" means that the value of DAI is 2,...16 * (M-1) +2, and DAI = "001" means that the value of DAI is 4 ... 16 * ( M-1)+4, DAI = "010" means that the value of DAI is 6 ... 16 * (M-1) +6, DAI = "110" means that the value of DAI is 14 ... 16 * (M-1) +14, and DAI = "111" means that the value of DAI is 16 ... 16 * (M-1) +16. The above-described embodiments have been mainly described on the UE side. However, in order to ensure correct reception of the HARQ-ACK, the base station also has the same criteria and methods as those of the UE, and the size of the HARQ-ACK codebook and the mapping of ACK/NACK bits when the HARQ-ACK codebook is received, It is not difficult to see that values of the first type DAI and/or the second type DAI need to be determined when DCI is transmitted.

In some embodiments, if the base station configures at least one carrier for the UE in CBG scheduling mode, the base station cannot simultaneously configure HARQ-ACK spatial bundling for the carrier configured with the CBG scheduling mode for the UE.

In some embodiments, when the uplink control signaling comprising HARQ-ACK exceeds the invited number of bits that can be carried over the used PUCCH format, the UE may assign HARQ-ACK bundling of the spatial dimension to the CBG dimension. May take precedence over bundling. Alternatively, the UE may preferentially perform CBG dimension bundling over spatial dimension bundling. Bundling of the CBG dimension generates a 1-bit HARQ-ACK after performing an AND operation on HARQ-ACKs of several CBGs in one TB. HARQ-ACK bundling of spatial dimensions is performed according to a method when a base station configures HARQ-ACK bundling of spatial dimensions according to an embodiment of the present disclosure.

In some embodiments, HARQ-ACK bundling of CBG dimension is implemented such that the number of HARQ-ACK bits of a carrier based on CBG scheduling does not change according to the number of actually scheduled TBs and is a fixed value Nmax_harq. The fixed value is indicated as set by the base station or predefined. It can be implemented according to at least one of the following methods:

If Nmax_harq = Nmax_CBG, and Nmax_CBG is the total number of maximum numbers of CBGs for all TBs scheduled at one time, the number of HARQ-ACK bits of each TB is Nmax_harq / Nmax_TB. The scheduled TB generates ACK/NACK according to the decoding result, and the non-scheduled TB sends Nmax_CBG_TBi dummy bits, where a predetermined dummy bit may be NACK or ACK.

If Nmax_harq = Nmax_CBG and Nmax_CBG is the maximum number of CBGs for one simultaneously scheduled TB, the sum of the numbers of HARQ-ACK bits corresponding to all concurrently scheduled TBs may be Nmax_CBG according to a method described below. . For example, when two TBs are scheduled, even if the maximum number of CBGs that can be scheduled by each TB is Nmax_CBG = 4, the number of HARQ-ACK bits of each TB is Nmax_CBG/2 = 2. In one implementation, the HARQ-ACKs of multiple CBGs may be ANDed according to a predetermined rule, that is, the HARQ-ACKs of multiple CBGs are bundled. For example, when two TBs are scheduled, Assuming that 1TB schedules 4 CBGs and 2TB schedules 3 CBGs, HARQ-ACKs of the first 2 CBGs of 1TB are ANDed to obtain 1-bit HARQ-ACK, and HARQ-ACKs of the last two CBGs are multiplied. -ACKs are logically multiplied to obtain 1-bit HARQ-ACK. The HARQ-ACKs of the first two CBGs of the 2TB are ANDed to obtain a 1-bit HARQ-ACK, and the HARQ-ACK of the third CBG of the 2TB is 1 bit. In another example, assume that when two TBs are scheduled, the first TB schedules the second and third CBGs and the second TB schedules the third CBG. Assuming that DAI indicates that a total of 3 CBGs are scheduled or that 3 bits of HARQ-ACK should be fed back for scheduling, bundling is not required. In another example, assume that when two TBs are scheduled, the first TB schedules four CBGs and the second TB schedules the third CBG. Assuming that DAI indicates that there are 3 scheduled CBGs or that 3 bits of HARQ-ACK should be fed back for scheduling, the HARQ-ACKs of the 1st and 2nd CBGs of 1TB are bundled, and the 3rd of 1TB is and HARQ-ACKs of the 4th CBGs are bundled, and the 3rd CBG of the 2nd TB generates a 1-bit HARQ-ACK.

CBGs of other TBs are preferably not bundled.

Unscheduled CBGs preferably do not participate in bundling. For example, when two TBs are scheduled, assume that 1TB schedules 1st, 3rd and 4th CBGs and 2TB schedules 1st CBG. , the 2nd CBG of the 1st TB does not participate in bundling. Bit Corresponds to HARQ-ACK and generates 1-bit dummy bit. The dummy bit is a predetermined value, for example, a value of NACK.

Unscheduled CBGs preferably do not participate in bundling. An unscheduled CBG corresponds to an ACK if it was previously scheduled and decoded correctly, otherwise it corresponds to a NACK.

The bundling of CBG dimensions described above can be combined with the method of type 1 DAI/type 2 DAI of the present invention. As shown in FIG. 11, DAI performs counting at the granularity of CBGs and counts the number of CBGs for all TBs of each PDSCH. Assuming that carrier 1 schedules the total number of bits for HARQ-ACK feedback Nmax_harq = 4, the base station schedules 2 TBs, each TB can be divided into 4 CBGs, and TBa is the 3rd CBG , and TBb schedules the first and second CBGs. Carrier 2 schedules TBc. At this time, the first type DAI of carrier 1 is 1, the first type DAI of carrier 2 is 5, the second type DAI of carriers 1 and 2 is 5, and the size of the HARQ-ACK codebook fed back by the UE is It is 5 bits. Carrier 1 uses 4 bits, TBa and TBb use 2 bits, the first bit of TBa is a dummy bit, the second bit of TBa generates ACK/NACK according to the detection result of CBG3, and of TBb The first bit is a logical product result of ACK/NACK as a result of detecting CBG1 and CBG2, and the second bit of TBb is a dummy bit. Carrier 2 uses 1 bit and TBc has 1 bit of ACK/NACK. The fifth bit in the HARQ-ACK codebook determines an ACK/NACK value according to the detection result of the scheduled TBc. In this example, even though carrier 2 can schedule up to 2 TBs, the number of HARQ-ACK bits of carrier 2 is determined according to the number of actually scheduled TBs. If the HARQ-ACK code length set for the carrier configured during TB scheduling according to another method of the present invention is 2, the size of the HARQ-ACK codebook in this example is 6 bits, of which the 6th bit is a dummy bit.

The HARQ-ACK codebook through the above methods may change according to the number of scheduled carriers and the number of scheduled downlink time units.

Also, in another business of determining the HARQ-ACK codebook, the size of the HARQ-ACK codebook is set/activated downlink carriers or downlink time units that feed back HARQ-ACKs to a given uplink time unit/uplink carrier. can be determined by the number of Also, it may be determined by the maximum number of CBGs of these downlink carriers/downlink time units. That is, the three dimensions can be summed. It should be noted that the maximum number of CBGs for each downlink carrier and/or downlink time unit may be the same or different. If at least one downlink carrier is configured to operate in a multi-TB operation mode and the base station does not configure bundling for the spatial dimension, the size of the HARQ-ACK codebook is the maximum of TBs that can be scheduled by adding three dimensions Can be based on multiplication by number. The maximum number of TBs that can be scheduled is the same for all downlink carriers and/or downlink time units. When the base station configures the bundling of the spatial dimension, the ACK/NACK with the same index of each CBG of each TB is ANDed.

In addition, in another method for determining the HARQ-ACK codebook, the size of the HARQ-ACK codebook may be determined according to the third type DAI. The content indicated by the 3rd type DAI is the same as the content indicated by the 2nd type DAI, or the 3rd type DAI indicates the total number of bits of the HARQ-ACK/NACK codebook that the base station expects to receive, The total number of bits of HARQ-ACK/NACK corresponding to the actually scheduled PDSCH is less than or equal to the expected total number of bits. When the HARQ-ACK is transmitted on the PUSCH, if the PUSCH is rate-matched according to the HARQ-ACK codebook, the size of the HARQ-ACK codebook is indicated by the third type DAI.

Also, in the above method, the method of determining which HARQ-ACK of the PDSCH of the downlink time unit is fed back in the uplink time unit is not limited. For example, it is determined according to the prior art, determined according to semi-statically set uplink-downlink configuration, or determined according to the HARQ-ACK feedback time indicated in downlink control signaling.

Also, in some embodiments, when the UE is configured to perform CBG-based HARQ-ACK feedback, it may happen that the CRC checksum of each CBG in one TB is correct, but the CRC checksum of the TB fails. In order to at least partially solve or mitigate this problem, the UE may perform HARQ-ACK feedback in at least one of the following ways.

1st HARQ-ACK Feedback

In some embodiments, the UE may not only feed back the CBG's HARQ-ACK, but also the TB's HARQ-ACK. ACK/NACK bits for this TB may be located at the beginning of the HARQ-ACK codebook or at the end of the HARQ-ACK codebook.

For example, when the UE is scheduled for two TBs, for example, the bit order of the HARQ-ACK codebook is ACK/NACK bits of TB1, ACK/NACK bits of #1 CBG of TB1, ACK/NACK bits of #2 CBG, ..., ACK/NACK bits of #Nmax_CBG CBG of TB1, ACK/NACK bits of TB2, ACK/NACK bits of #1 CBG of TB2, ..., #Nmax_CBG of TB2 ACK/NACK bits of CBG, where Nmax_CBG is the maximum number of CBGs of each TB.

Second HARQ-ACK feedback

In some embodiments, the UE may feed back the HARQ-ACK of CBG, and the bit length of the HARQ-ACK of CBG fed back by the UE may be Nmax_CBG * Nmax_TB. If spatial dimension bundling is adopted, the UE may feed back the HARQ-ACK of CBG, and the bit length of the HARQ-ACK of CBG fed back by the UE may be Nmax_CBG. For convenience, one TB is described below. Assuming that the current PDSCH transmission contains a complete TB, i.e. all CBGs in a TB are transmitted, the UE correctly detects each of the CBGs for the TB according to the correct CRC checksum for each CBG, but If the TB is not accurately detected according to the incorrect CRC checksum, the UE may generate a NACK value for each of the CBGs. Also, if the UE correctly detects the TB according to the correct CRC checksum for the TB, the UE can generate an ACK value for each of the CBGs.

The current downlink transmission does not include all CBGs of one TB, and up to the current scheduling time, all CBGs of the TB are correctly detected by the CRC checksums for each CBG, but the TB has a CRC checksum If not detected correctly by , the ACK/NACK is generated as at least one of the following: a NACK value for each of the CBGs of the TB is generated; In the current scheduling, a NACK is generated for each of the unscheduled CBGs for which ACKs were previously fed back; In the current scheduling, for each of the unscheduled CBGs to which ACKs were previously fed back, an ACK/NACK value opposite to the value of a certain dummy bit is generated.

Also, in some embodiments, if the current scheduling includes only a portion of a TB, i.e., if some of the CBGs of one TB have been scheduled so far, the UE checks the CRC of all CBGs in the TB for each CBG. It is detected correctly by the thumbs, but by the CRC checksum for the TB, we find that the TB is not detected correctly. The UE may determine the value of ACK/NACK according to at least one of the following three methods.

(1) generate a NACK value for each of the CBGs of the TB;

(2) generating a NACK value for each of the CBGs for which ACKs were reported earlier but not scheduled in the current scheduling;

(3) In current scheduling, an ACK/NACK value opposite to a value of a predetermined dummy bit is generated for each of the CBGs for which ACKs have been previously reported but have not been scheduled. For example, if a certain dummy bit value is NACK, in this case the ACK is fed back; Conversely, if the predetermined dummy bit value is ACK, NACK is fed back in this case.

For example, an ACK/NACK value of a scheduled CBG may be determined according to a CRC checksum of the corresponding CBG, and an ACK/NACK value of an unscheduled but accurately decoded CBG may be ACK. In addition, if the UE knows that the CRC checksum of the TB does not match the CRC checksum of the CBG, the UE may set the ACK/NACK values of all CBGs of the TB to NACK. For example, it may be assumed that the maximum number of CBGs that can be scheduled is 4. In downlink time unit T1, the base station schedules initial transmission of TB divided into 4 CBGs. If the UE receives a TB, and the CRC checksums of #1 CBG and #2 CBG in this TB fail and the CRC checksums of #3 CBG and #4 CBG are successful, the HARQ-ACK fed back by the UE is NACK, It can be NACK, ACK, ACK. The base station schedules retransmission of TB scheduling #1 and #2 CBGs in downlink time unit T2, and the UE receives the TB. If the CRC checksums of #1 and #2 CBGs are correct, but the CRC checksum of TB fails, the HARQ-ACK fed back by the UE can be NACK, NACK, NACK, NACK in this case.

Also, in some embodiments, if the current scheduling includes only part of a TB, i.e. some of the CBGs of one TB are scheduled, so far the UE has all the CBGs in the TB using the CRC checksum for each CBG. If it is found that the TB is not correctly detected by the CRC checksum for the TB although it is detected correctly by the , the UE may determine the value of ACK/NACK according to one of the following two methods.

(1) generate an ACK value for each CBG;

(2) Generate an ACK value for each CBG scheduled in the current transmission, and ACK/NACKs of other CBGs are values of dummy bits.

In some embodiments, when the number of CBGs actually split in one TB is less than Nmax_CBG, the method can be applied only to HARQ-ACK bits corresponding to the number of CBGs actually split, and HARQ-ACK bits for other CBGs ACKs are not limited. For example, Nmax_CBG = 4, and the current TB can only be split into two CBGs; If a CRC error occurs, 2 bits of HARQ-ACKs are set to NACKs, and the remaining 2 bits are unrestricted. Alternatively, the method may be applied to Nmax_CBG HARQ-ACK bits. For example, when Nmax_CBG = 4 and the current TB can only be divided into two CBGs, and a CRC error of TB occurs, all 4 bits of HARQ-ACKs are set to NACKs.

In some embodiments, the UEE checks the TB's CRC only if the CRCs for all CBGs in the TB are correct.

The method in the above embodiment may be used in combination with the embodiment shown in FIG. 1 and/or the embodiment shown in FIG. 2 . For example, determining HARQ-ACK of unscheduled CBGs according to the method shown in FIG. 2 can be combined with the embodiment shown in FIG. 1 and can also be used in combination with other techniques.

12 is a block diagram of an exemplary hardware configuration of an exemplary network node and/or user equipment according to an embodiment of the present disclosure. Hardware configuration 1200 may include processor 1206 . Processor 1206 can be a single processor unit or a plurality of processing units for performing the various operations of the flow described herein. The configuration 1200 can also include an input 1202 for receiving signals from other entities and an output 1204 for providing signals to the other entities. The input unit 1202 and the output unit 1204 may be composed of a single entity or separate entities.

Additionally, the configuration 1200 may include at least one in the form of non-volatile or volatile memory, such as electrically erasable programmable read only memory (EEPROM), flash memory, optical disks, Blu-ray disks, and/or hard disk drives. may include one readable storage medium 1208 . The readable storage medium 1208 , when executed by the processor 1206 in the configuration 1200 , allows the hardware configuration 1200 and/or a device including the hardware configuration 1200 to be used with respect to FIGS. 1 and/or 2 . computer program 1210, which may include code/computer readable instructions to perform the processes described above, and any variations thereof, etc.

The computer program 1210 may be configured as, for example, computer program code having a structure of computer program modules 1210A-1210C. Thus, in an exemplary embodiment using hardware configuration 1200 as a base station, code in the computer program of configuration 1200 determines the number of transport blocks (TBs) that can be scheduled in a downlink transmission and the number of transport blocks (TBs) that can be scheduled in the downlink transmission. and a module 1210A for determining, based on the maximum number of divisible coding block groups (CBGs), a maximum number of divisible CBGs within each TB of the downlink transmission. Code in the computer program may further include a module 1210B for determining a CBG configuration of CBGs scheduled within each TB of the downlink transmission based on the maximum number of divisible CBGs within that TB. Code in the computer program may further include a module 1210C for transmitting downlink control signaling indicating the CBG configuration. However, other modules may be included in the computer program 1210 for performing the various steps of the various methods disclosed herein.

Further, in an exemplary embodiment in which hardware configuration 1200 is used as a user equipment, code in a computer program of configuration 1200 may include a module 1210A for receiving downlink control signaling. The code in the computer program is a module for generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission ( 1210B) may be further included. The code in the computer program may further include a module 1210C for feeding back the HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook. However, other modules may be included in the computer program 1210 for performing the various steps of the various methods disclosed herein.

Computer program modules may actually perform various operations of the flow shown in FIGS. 1 and/or 2 to simulate various devices. In other words, when executing the various computer program modules in the processor 1206, they may correspond to various different units of the various devices discussed herein.

Code means in the embodiments disclosed above with respect to FIG. 12 are embodied as computer program modules that, when executed on processor 1206, cause hardware configuration 1200 to perform the operations described above with respect to FIGS. 1 and/or 2. However, in other embodiments at least one of the code means may be implemented at least partially as a hardware circuit.

A processor may be one central processing unit (CPU), but may include two or more processing units. For example, a processor may include a general purpose microprocessor, an instruction set processor and/or related chipsets and/or a special purpose microprocessor (eg, an application specific integrated circuit (ASIC)). The processor may also include on-board memory for caching purposes. A computer program may be executed by a computer program product coupled to the processor. A computer program product may include a computer readable medium having a computer program stored thereon. For example, the computer program product may be flash memory, RAM, ROM, EEPROM, and in other embodiments the UE may be distributed to different computers in the form of memory within the program product.

13 is a block diagram illustrating another exemplary hardware configuration of an exemplary network node and/or user equipment according to an embodiment of the present disclosure.

Referring to FIG. 13 , a hardware configuration 1300 may include a processor 1310 , a transceiver 1320 , and a memory 1330 . However, not all of the illustrated components are essential. The hardware configuration 1300 may be implemented with more or fewer components than those shown in FIG. 13 . Also, the processor 1310, the transceiver 1320, and the memory 1330 may be implemented as a single chip according to other embodiments.

The above-mentioned components will be described in detail below.

Processor 1310 may include one or more processors or other processing devices that control a proposed function, process, and/or method. Operations of the network node and/or user device according to an example of the present disclosure may be implemented by the processor 1310.

When the hardware configuration 1300 performs the operation of the network node, the processor 1310 determines the number of transport blocks (TBs) that can be scheduled for downlink transmission and the number of divisible coding block groups (CBGs) for downlink transmission. Based on the maximum number, it is possible to determine the maximum number of divisible CBGs within each TB of the downlink transmission. The processor 1310 may determine a CBG configuration of CBGs scheduled within the TB based on the maximum number of CBGs that can be divided within each TB of the downlink transmission. The processor 1310 may control the transceiver 1320 to transmit downlink control signaling indicating the CBG configuration.

Meanwhile, when the hardware configuration 1300 performs an operation of the user device, the processor 1310 may control the transceiver 1320 to receive downlink control signaling. The processor 1310 may generate downlink control signaling, a reference transport block during downlink transmission corresponding to the downlink control signaling, and a HARQ-ACK codebook according to a decoding result for downlink transmission. The processor 1310 may control the transceiver 1320 to transmit HARQ-ACK corresponding to downlink transmission according to the generated HARQ-ACK codebook.

The transceiver 1320 may include an RF transmitter for up-converting and amplifying a transmitted signal, and an RF receiver for down-converting a frequency of a received signal. However, according to other embodiments, the transceiver 1320 may be implemented with more or fewer components than those shown.

Transceiver 1320 is coupled to processor 1310 and may transmit and/or receive signals. Signals can include control information and data. Also, the transceiver 1320 may receive a signal through a wireless channel and output the signal to the processor 1310. The transceiver 1320 may transmit a signal output from the processor 1310 through a radio channel.

The memory 1330 may store control information or data included in signals obtained by the hardware configuration 1300 . The memory 1330 may be connected to the processor 1310 and store at least one command, protocol, or parameter for a proposed function, process, and/or method. Memory 1330 may include read-only memory (ROM) and/or random access memory (RAM) and/or hard disk and/or CD-ROM and/or DVD and/or other storage devices.

The present disclosure has thus far been described with respect to preferred embodiments. It will be appreciated by those skilled in the art that various other changes, substitutions and additions may be made without departing from the concept and scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the specific embodiments described above, but should be defined by the appended claims.

In addition, functions described herein as implemented by pure hardware, pure software, and/or firmware may also be implemented using dedicated hardware, a general combination of hardware and software, or the like. For example, functions described as being implemented through dedicated hardware (eg, Field Programmable Gate Arrays (FPGAs), application specific integrated circuits (ASICs), etc.) It can be implemented by general-purpose hardware and software, such as, and vice versa.

Claims (20)

In the method for transmitting and receiving signals by user equipment (UE),
Receiving code block groups (CBGs) of a transport block (TB) included in a physical downlink shared channel (PDSCH);
If each of the received CBGs is correctly detected based on code block cyclic redundancy checks (CRCs), but the TB is not correctly detected based on the CRC for the TB, NACK for each of the received CBGs (non-acknowledgment ) Generating hybrid automatic repeat request (HARQ) feedback bits including bits; and
Transmitting the generated HARQ feedback bits;
The number of the received CBGs

is the maximum number of CBGs set

If less than, at least one NACK bit is generated, and the number of the generated at least one NACK bit is

and

corresponds to the difference in
When CBG-based PDSCH reception is configured, HARQ-ACK spatial bundling is not supported. According to claim 1,
The maximum number of CBGs is set through higher layer signaling of the physical layer. delete delete delete delete delete delete delete delete delete delete delete delete As a user equipment (UE) that transmits and receives signals,
transceiver; and
And a processor connected to the transceiver, wherein the processor,
Receiving code block groups (CBGs) of a transport block (TB) included in a physical downlink shared channel (PDSCH),
If each of the received CBGs is correctly detected based on code block cyclic redundancy checks (CRCs), but the TB is not correctly detected based on the CRC for the TB, NACK for each of the received CBGs (non-acknowledgment ) generates HARQ (hybrid automatic repeat request) feedback bits including bits,
Transmitting the generated HARQ feedback bits,
The number of the received CBGs

is the maximum number of CBGs set

If less than, at least one NACK bit is generated, and the number of the generated at least one NACK bit is

and

corresponds to the difference in
User equipment in which HARQ-ACK spatial bundling is not supported when CBG-based PDSCH reception is configured. According to claim 15,
The maximum number of CBGs is set through higher layer signaling of a physical layer. In the method for transmitting and receiving signals by a base station,
Transmitting code block groups (CBGs) of a transport block (TB) included in a physical downlink shared channel (PDSCH); and
If each of the transmitted CBGs is correctly detected based on code block cyclic redundancy checks (CRCs), but the TB is not correctly detected based on the CRC for the TB, NACK for each of the received CBGs (non-acknowledgment ) receiving HARQ (hybrid automatic repeat request) feedback bits including a bit,
The number of transmitted CBGs

is the maximum number of CBGs set

If less than, at least one NACK bit is generated, and the number of the generated at least one NACK bit is

and

corresponds to the difference in
HARQ-ACK spatial bundling is not supported when CBG-based PDSCH transmission is configured. According to claim 17,
The maximum number of CBGs is set through higher layer signaling of the physical layer. In the base station for transmitting and receiving signals,
transceiver; and
And a processor connected to the transceiver, wherein the processor,
Transmit code block groups (CBGs) of a transport block (TB) included in a physical downlink shared channel (PDSCH),
If each of the transmitted CBGs is correctly detected based on code block cyclic redundancy checks (CRCs), but the TB is not correctly detected based on the CRC for the TB, NACK for each of the received CBGs (non-acknowledgment Receive hybrid automatic repeat request (HARQ) feedback bits including ) bits,
The number of transmitted CBGs

is the maximum number of CBGs set

If less than, at least one NACK bit is generated, and the number of the generated at least one NACK bit is

and

corresponds to the difference in
A base station in which HARQ-ACK spatial bundling is not supported when CBG-based PDSCH transmission is configured. According to claim 19,
The maximum number of CBGs is set through higher layer signaling of a physical layer.

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