KR20190139241A - Method and apparatus for signal transmission and reception in mobile communication system - Google Patents

Abstract

The present disclosure proposes a method and corresponding network node performed to schedule downlink transmissions in a network node. The method according to the present disclosure is based on the number of transport blocks (TBs) scheduled in the downlink transmission and the maximum number of splittable coding block groups (CBGs) in the downlink transmission, the CBG splittable in each TB of the downlink transmission Determining a maximum number of them; Determining a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs splittable in each TB of downlink transmissions; And transmitting downlink control signaling indicative of the CBG configuration. The present disclosure also proposes a method performed at a user equipment (UE) for Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) feedback, and a corresponding user equipment, and a communication system including the network node and the user equipment.

Description

Method and apparatus for signal transmission and reception in mobile communication system

TECHNICAL FIELD The present disclosure relates to the field of mobile communications technologies, and more particularly, to a downlink scheduling method and a corresponding network node, a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback method and a corresponding user device, computer storage medium, and network node. And a communication system comprising a user device.

Efforts have been made to develop enhanced fifth generation (5G) or redundant 5G communication systems to meet the growing demand for wireless data traffic since deployment of fourth generation (4G) communication systems. 5G or redundant 5G communication systems are also referred to as 'beyond 4G (after 4G) networks' or 'post long term evolution (LTE) systems'. 5G communication systems are considered to be implemented in higher frequency (mmWave) bands, such as 60Ghz bands, to achieve higher data rates. Beamforming, multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large scale antennas to reduce radio wave propagation losses and increase transmission distances. Techniques are discussed in connection with 5G communication systems. In addition, in 5G communication systems, advanced small cells, cloud radio access networks (RANs), dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, CoMP (Coordinated) Development of system network is under development based on Multi-Points) and receiver interference cancellation. In 5G systems, hybrid frequency shift keying (FSK) and Feher's quadrature amplitude modulation (FQM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multicarrier (FBMC) as advanced access technology ), Non-orthogonal multiplexed access (NOMA), and sparse code multiple access (SCMA) have been developed.

The Internet, a human-centered access network where people create and consume information, is currently evolving into the Internet of Things (IoT), where distributed entities such as things exchange and process information without human intervention. The Internet of Things (IoE), a combination of IoT technology and big data processing technology through cloud servers, has emerged. Technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" are required for IoT implementations, so that machine-to-machine communication, MTC (machine type communication) has recently been studied. Such IoT environments can provide intelligent Internet technology services that create new value in human life by collecting and analyzing data generated between connected objects. IoT integrates smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart appliances, and advanced medical services through convergence and combination of existing information technology (IT) and various industrial applications. It can be applied to various fields, including.

In addition, various attempts have been made to apply 5G communication systems to IoT networks. For example, techniques such as sensor network, MTC, and M2M communication may be implemented by beamforming, MIMO, and array antennas. Application of the cloud RAN as the big data processing technology described above may also be regarded as an example of convergence between 5G technology and IoT technology.

As described above, various services may be provided in accordance with the development of the wireless communication system, and thus a method for easily providing such a service is required.

There is an urgent need for new solutions on how to design downlink scheduling signaling and how to design HARQ-ACK feedback mechanisms so that uplink and downlink control signaling overhead is adequately created without affecting scheduling flexibility. have.

The present disclosure proposes a method and corresponding network node performed to schedule downlink transmissions in a network node. The method is based on the number of transport blocks (TBs) scheduled in the downlink transmission and the maximum number of splittable coding block groups (CBGs) in the downlink transmission, the number of CBGs splittable within each TB of the downlink transmission. Determining a maximum number; Determining a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs that can be split in each TB of the downlink transmissions; And transmitting downlink control signaling indicating the CBG configuration. The present disclosure also proposes a method performed at a user equipment (UE) for Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) feedback, and a corresponding user equipment, and a communication system including the network node and the user equipment.

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

These and / or other embodiments and advantages of the present disclosure will become apparent from the following description of some of the specific embodiments made in conjunction with the accompanying drawings and will be more readily understood.
1 is a flow diagram illustrating an example method for scheduling downlink transmissions in accordance with an embodiment of the present disclosure.
2 is a flow diagram illustrating an example method for feeding back HARQ-ACK / NACK in accordance with an embodiment of the present disclosure.
3 is a diagram illustrating virtual CBG and actual CBG generation 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 example hardware configuration of an example network node and / or user equipment in accordance with an embodiment of the present disclosure.
13 is a block diagram illustrating another example hardware configuration of an example network node and / or user equipment according to an embodiment of the present disclosure.

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

In accordance with a first embodiment of the present disclosure, a method is provided that is performed to schedule downlink transmissions at a network node. The method is partitionable within each TB of the downlink transmission based on the number of transport blocks (TBs) that can be scheduled in downlink transmission and the maximum number of splittable coding block groups (CBGs) in the downlink transmission. Determining a maximum number of CBGs; Determining a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs that can be split in each TB of the downlink transmissions; And transmitting downlink control signaling indicating the CBG configuration.

In some embodiments, the maximum number of splittable CBGs in the downlink transmission is set through higher layer signaling and does not change according to the maximum number of TBs that can be scheduled in the downlink transmission. In some embodiments, the maximum number of TBs that can be scheduled is set via 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. The number of TBs that can be scheduled here can be considered as the maximum number of TBs that can be scheduled. It is easy to see that this number changes semi-statically. In a transmission mode in which the number of TBs that can be scheduled is 2, the number of TBs that can be scheduled in actual scheduling of the base station may be 1 or 2. In some embodiments, the number of TBs that can be scheduled in downlink transmission is indicated via 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 scheduled at the same time through physical layer signaling (DCI). Here, the number of TBs that can be scheduled may be regarded as the number of TBs actually scheduled. It is easy to see that this is a dynamic process. In the special case scheduling, such as the scheduling of DCI 1A for fall back in LTE systems, how to determine the number of CBGs is not within the scope of the present invention. In the fallback case, TB based scheduling is used instead of subdividing the TB into CBGs.

In some embodiments, each of the downlink transmissions, based on the number of transport blocks (TBs) that can be scheduled in a downlink transmission and the maximum number of splittable coding block groups (CBGs) in the downlink transmission, Determining the maximum number of splittable CBGs in the TB of, if the downlink transmission can schedule only one TB, splitting into one TB equal to the maximum number of splittable CBGs in the downlink transmission Determining a maximum number of possible CBGs; If the downlink transmission substantially schedules one TB, determining a maximum number of CBGs that can be split into the one TB equal to the maximum number of CBGs that can be split during the downlink transmission; When the downlink transmission substantially schedules one TB that is the initial transmission, the maximum number of CBGs that can be split into one TB is determined to be equal to the maximum number of CBGs that can be split during the downlink transmission. Maintaining a maximum number of CBGs that can be split in the TB upon retransmission; If the downlink transmission can schedule two TBs, the splittable CBG of each of the two TBs such that the sum of the maximum number of splittable CBGs of the two TBs is equal to the maximum number of splittable CBGs in the downlink transmission. Determining maximum numbers of the plurality of subframes, wherein the maximum number of splittable CBGs of the two TBs is the same or different from each other; If the downlink transmission substantially schedules two TBs, the splittable of each of the two TBs is such that the sum of the maximum number of splittable CBGs of the two TBs is equal to the maximum number of splittable CBGs in the downlink transmission. Determining maximum numbers of CBGs, wherein the maximum number of splittable CBGs of the two TBs is the same or different from each other; If the downlink transmission can schedule two TBs, the splittable CBG of each of the two TBs such that the sum of the maximum number of splittable CBGs of the two TBs is equal to the maximum number of splittable CBGs in the downlink transmission. Determine the maximum number of subframes, the maximum number of subdividable CBGs of the two TBs are the same 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 partitionable CBGs of one TB includes at least one of the same steps as the maximum number of partitionable CBGs of the TB when scheduling two TBs simultaneously.

In some embodiments determining the CBG configuration of the CBGs scheduled in the TB based on the maximum number of CBGs splittable within each TB of the downlink transmission may include: Determining the CBG configuration of the CBGs that can be scheduled in each TBs so as to be equal to or less than the maximum number of partitionables in each TBs. Determining the CBG configuration of the CBGs scheduled in the TB based on the maximum number of CBGs that can be split in each TB of the downlink transmission may be splittable in the downlink transmission for each TB. Determining the maximum number of virtual CBGs for the TB based on the maximum number of CBGs; 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 to determine the configuration such that the number of real CBGs does not exceed the maximum number of splittable CBGs in the TB. In some embodiments determining the CBG configuration of the CBGs scheduled in the TB based on the maximum number of CBGs that are splittable within each TB of the downlink transmission, determines the CBG configuration for each TB. To this end, determining the number of CBGs that are actually scheduled based on the size of the TB and the maximum number of CBGs that can be partitioned within the TB. In some embodiments, the downlink control signaling indicative of 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 empty; An independent field for allowing a plurality of CBGs to indicate whether a Hybrid Automatic Repeat Request (HARQ) buffer for corresponding CBGs should be empty; Downlink allocation index (DAI) of a first type; And at least one of the second type of DAI. In some embodiments, the first type of downlink allocation index (DAI) is the sum of the number of CBGs scheduled in the HARQ-ACK feedback bundling window to the current scheduled downlink time unit and the current carrier. ; Adding 1 to the sum of the number of scheduled CBGs in the HARQ-ACK feedback bundling window to the current scheduled downlink time unit and / or the last downlink time unit and / or the current carrier previous carrier; The sum of the maximum number of CBGs of the downlink time unit and / or downlink carrier scheduled in the HARQ-ACK feedback bundling window to the current scheduled downlink time unit and the current carrier; Of the maximum number of CBGs of the scheduled downlink time unit and / or downlink carrier within the HARQ-ACK feedback bundling window to the current downlink time unit and / or the last downlink time unit and / or the current carrier previous carrier. One of the sums plus one. In some embodiments, the second type of DAI comprises: a total number of bits of a HARQ-ACK codebook; The total number of scheduled CBGs of all scheduled carriers from the first downlink time unit of all scheduled downlink time units to a current downlink time unit in the HARQ-ACK feedback bundling window; And a total number of maximum numbers of CBGs of all scheduled carriers from an initial downlink time unit of all scheduled downlink time units to a 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 is splittable within each TB of the downlink transmissions based on the number of transport blocks (TBs) that can be scheduled in downlink transmissions and the maximum number of splittable coding block groups (CBGs) in the downlink transmissions. A coding block group maximum number determining unit configured to determine a maximum number of CBGs; A CBG configuration determination unit configured to determine a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs that can be split in 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 transmissions is provided. The network node, based on the processor, the number of transport blocks (TBs) that can be scheduled in downlink transmission when executed by the processor, and the maximum number of splittable coding block groups (CBGs) in the downlink transmission, Determine a maximum number of splittable CBGs in each TB of link transmission; Determine a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs that are splittable in each TB of the downlink transmission; And a memory having instructions stored thereon for transmitting downlink control signaling indicative of the CBG configuration.

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

According to a fifth embodiment of the present disclosure, a method performed at a user equipment (UE) to report a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) is provided. The method includes receiving downlink control signaling; Generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in 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 downlink control indicator (DCI) and / or higher layer signaling received from a network node. In some embodiments, the downlink control signaling comprises: a first type of downlink allocation index (DAI); Second type of DAI: information used for determining the number of transport blocks based on which the HARQ-ACK is fed back; A maximum number of splittable coding block groups (CBGs) in the transport block (TB); And information on whether the HARQ-ACK feedback performs spatial dimension bundling. In some embodiments, the same uplink transmission may be scheduled to feed back HARQ-ACK. If the number of transport blocks on the at least one carrier that can be greater than 1: If the downlink control signaling indicates that spatial dimension bundling is not performed, the number of transport blocks based on which HARQ-ACK is fed back is Equal to 2; If 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 a product of the maximum number of splittable CBGs in 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 the HARQ-ACK is fed back. In some embodiments, the reference transport block is a transport block having the maximum number of CBGs that are actually scheduled. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may include: According to the DAI of the second type of downlink control signaling, determining the bit length of the HARQ-ACK codebook is the product of the value of the DAI of the second type and the number of transport blocks based on which the HARQ-ACK is fed back. Steps. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may include: Determining, according to the first type DAI of downlink control signaling, a start point of a bit position of an ACK / NACK of the downlink transmission in the HARQ-ACK codebook. In some embodiments, according to the first type DAI of the downlink control signaling, determining a starting point of a bit position of an ACK / NACK of the downlink transmission in the HARQ-ACK codebook is in the HARQ-ACK codebook. Determining a start point of a bit position of an 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 an 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 ACK / NACK of the downlink transmission + 1; The start point of the bit position of the ACK / NACK of the downlink transmission in the HARQ-ACK codebook is the product of the number of transport blocks based on the feedback of the first type DAI of the downlink control signaling and the HARQ-ACK. Determining as; And multiplying the start 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 feedback of the first type DAI of the downlink control signaling and the HARQ-ACK; And determining as bit length + 1 of the ACK / NACK of the downlink transmission. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may include: The bit length of the ACK / NACK of the downlink transmission is determined as the product of the maximum number of CBGs that can be split in one TB and the number of transport blocks based on which the HARQ-ACK is fed back, but scheduled in scheduled TBs. The ACK / NACKs of a CBG are generated according to the CRC checksums of actual scheduled CBGs, the ACK / NACKs of unscheduled CBGs are dummy bits, and the ACK / NACKs of unscheduled TBs are dummy bits. Step included. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may be performed. The bit length of the ACK / NACK of the 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, wherein the ACK of the reference transport block / NACK is generated according to the CRC checksum of the actual scheduled CBGs, ACK / NACK of the non-referenced transport block is generated according to the CRC checksum of the CBGs actually scheduled by the non-referenced transport block, Generating additional dummy bits such that the bit length of the ACK / NACK is equal to the number of CBGs actually scheduled by the reference transport block. It should. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may include: Determine the bit length of the ACK / NACK bit of the downlink transmission to be the maximum number of CBGs that can be divided by the TB when the downlink control signaling indicates spatial dimension bundling, wherein the ACK / NACK is in each TB And logically ANDing the 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 in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission, When all CBGs of one TB are scheduled by downlink transmission, if it is determined that all CBGs of the TB are correctly detected by CRC checksums for each CBG: the TB is in the CRC checksum for the TB. Generating an NACK value for each of the CBGs of the TB if not correctly detected, and generating an ACK value for each of the CBGs of the TB if the TB is correctly detected by a CRC checksum for the TB. It includes. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in 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, but all TBs of the TB up to the current scheduling time are correctly detected by CRC checksums for each CBG, but the TB is a CRC checksum If not correctly detected, the ACK / NACK comprises generating as at least one of the following: a NACK value for each of the CBGs of the TB is generated; NACKs are generated for each CBGs that were previously fed back with ACKs but not scheduled in the current scheduling; For each of the CBGs that were previously fed back ACKs but not scheduled in the current scheduling, an ACK / NACK value is generated that is the opposite of the value of the predetermined dummy bit. In some embodiments, generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission may include: Feedback to the HARQ-ACK of the corresponding TB for the downlink transmission as well as the ACK / NACKs of the CBGs split for the link 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 a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) 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 in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; And a feedback unit configured to feed back a 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 a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) is provided. The UE includes a processor, a control signaling receiver configured to receive downlink control signaling when executed by the processor; Generate a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; And a memory in which instructions for feeding back the HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook are stored.

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

According to an eighth embodiment of the present disclosure, a communication system is provided. 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 solutions according to 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 knows the size of the HARQ-ACK codebook (also called codebook) wrong It becomes possible to prevent that. In particular, when both CBG transmission and MIMO modes are used, embodiments of the present disclosure effectively reduce the overhead of the downlink control channel and the uplink channel carrying HARQ-ACK feedback.

Embodiment of the Invention

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, and details and functions not required 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 aid in a comprehensive understanding of exemplary embodiments of the present disclosure as defined by the claims and their equivalents. The following contains numerous specific details for the purpose of understanding, but these should only be regarded as examples. Accordingly, those skilled in the art will appreciate that various changes and modifications to the embodiments described herein may be made without departing from the scope and concept of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for clarity and conciseness. Also, like reference numerals are used for the same or similar functions and operations throughout the drawings. 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 form new embodiments that fall within the scope of the present disclosure. Can be. In addition, the term "comprises" and its derivatives are used in this disclosure inclusive and not in a limiting sense.

In the following, various solutions in accordance with embodiments of the present disclosure are described in detail, including, for example, "base station (abbreviated BS)" and "user equipment (abbreviated UE)", but the present disclosure is not limited thereto. Indeed, the present disclosure may be applied to any known or future wireless communication standard, including but not limited to 2G, 3G, 4G, 5G, and the like. For example, the 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. Thus, the term " base station " may be used interchangeably with the generic term " network node " including the items described above to indicate that it is a network side node capable of providing the same or similar functionality as the base station. In addition, in this document, the user device may actually include (but not limited to) the concepts of terms such as user device, mobile station, mobile terminal, smart phone, tablet, and the like.

To support more flexible scheduling, 3GPP is deciding to support variable HARQ-ACK feedback delay within 5G. In 5G systems, a particular downlink (also referred to as "down") time unit (time resource, such as a downlink slot), depending on whether it is Frequency Division Duplex (FDD) or Time Division Duplexor Time Division Duplex (TDD) systems Or uplink (also referred to as downlink mini slot), uplink (also referred to as "up") time units that can be used for HARQ-ACK feedback are variable. For example, the delay of the HARQ-ACK feedback may be dynamically indicated by physical layer signaling, and the various HARQ-ACK delays may be determined according to factors such as various services or user equipment performance. Thus, even in an 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 abbreviated Tb) can be further increased in a 5G system, enhanced eMBB (eMBB) for transmitting various types of services, for example, ultra-reliable and low latency communication (URLLC) To better support the coexistence of the puncturing portion of the Physical Downlink Shared Channel (PDSCH) of the Mobile Broadband service, 3GPP refines scheduling granularity in 5G, and schedules scheduling in the TB unit of LTE. Decide to extend to scheduling in code block (abbreviated Cb) / code block group (CB group or abbreviated CBG) units. Scheduling in the CB / CBG unit is mainly used for retransmission.

5G systems continue to support multiple input multiple output (MIMO) transmissions. When operating in the MIMO transmission mode, multiple Tbs may be scheduled simultaneously on one downlink time unit of one carrier. For example, in initial transmission, only 1 TB is scheduled when the number of layers for MIMO transmission is 4 or less. If the number of layers is greater than four, two TBs are scheduled. Or, in retransmission, two TBs can be scheduled even if the number of layers is four or less. Naturally, the number of TBs actually scheduled at each point in time by the base station can vary dynamically.

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

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

In the embodiment shown in FIG. 1, prior to the start of the method 100, the base station may generally set whether the scheduling mode of the carrier (eg, carrier Ci below) is TB based scheduling or CBG based scheduling. When set to CBG based scheduling, the base station may set the maximum number of schedulable CBGs as, for example, Nmax_CBG. When setting the value, the base station can explicitly set it as the maximum number of schedulable CBGs. Further, 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 with respect to the maximum number of schedulable CBGs. However, one of ordinary skill in the art will appreciate that the present disclosure is not limited thereto. In addition, in some embodiments, the base station may further set 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 the base station divides one TB into multiple CBs and further combines multiple CBs into CBGs. For example, the base station determines how many CBs to split according to the size of the TB, and then how many CBGs to combine according to Nmax_CBG.

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

Also in some embodiments, the base station may further set a MIMO transmission mode (which may in some cases be called a MIMO scheduling mode). For example, transmission between the base station and the UE may be set as a single-input multiple-output (SIMO) or MIMO transmission mode, but the number of layers of MIMO is not limited. Further, in some embodiments, the 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 can set the maximum number Nmax_CBG of schedulable CBGs for a schedule. If multiple TBs are scheduled on one schedule, the total number of CBGs scheduled in all TBs does not exceed Nmax_CBG. If only one TB is scheduled for 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 schedulable CBGs Nmax_CBG for one TB in one schedule such 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. Accordingly, the base station may 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, the information related to the setting may be set semi-statically 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 a 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 example method 100 of scheduling downlink transmissions in accordance with one embodiment of the present disclosure will be described in detail with steps S110 through S130 shown in FIG. 1.

As shown in FIG. 1, the 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 in the downlink transmission to be transmitted to the UE and the maximum number of splittable coding block groups (CBGs) in the downlink transmission. The maximum number of splittable CBGs in the TB can be determined.

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

Nmax_CBG_TBi = Nmax_CBG / NTB.

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

In step S110 of some embodiments, if the maximum number Nmax_CBG of splittable coding block groups (CBGs) in the downlink transmission is the total number of CBGs in one schedule, the base station may determine the maximum number of TBs that can be scheduled, and / or predetermined. The maximum number Nmax_CBG_TBi of the CBGs that can be actually scheduled in each TB can be determined according to the criteria. In some embodiments, the predetermined criteria can be as follows:

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 the even splitting principle as much as possible in some embodiments. For example, if Nmax_CBG = 5 and NTB = 2, then 1 TB of Nmax_CBG_TB1 may be 2 and 2TB of Nmax_CBG_TB2 may be 3, or 1TB of Nmax_CBG_TB1 may be 3 and 2TB of Nmax_CBG_TB2 is 2 days Can be.

Subsequently, as shown in FIG. 1, the method 100 may proceed to step S120. In step S120, the base station may determine the CBG configuration of the CBGs scheduled in the TB based on the maximum number of CBGs that can be split in each TB of the downlink transmission.

In some embodiments, to determine the configuration of CBGs that can be actually 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.

First CBG Configuration

In some embodiments, for each TB, the base station may determine, by Nmax_CBG, the maximum number Nvirtual_max_CBG_TBi of the virtual CBGs of that TB. For example, Nvirtual_max_CBG_TBi = Nmax_CBG. At this time, the base station may determine the number of virtual CBGs scheduled according to the TB size and Nvirtual_max_CBG_TBi. The base station may then map the virtual CBG to the actual CBG according to some scheme such that the number of CBGs that can actually be scheduled does not exceed the maximum number Nmax_CBG_TBi that can actually be scheduled within that TB. In this way the CBG composition in 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, and thus 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 six Cbs and divided into four 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 may 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. In addition, as will be appreciated by those skilled in the art, the above example is merely an example for the understanding of the reader and does not exclude that there may be other predetermined ways of mapping four virtual CBGs to two actual CBGs. For example, the first and third virtual CBGs may be mapped to the first real CBG, and the second and fourth virtual CBGs may be mapped to the second real CBG.

Further, 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, four virtual CBGs may correspond to four real CBGs.

Second CBG Configuration

In other embodiments, for each TB, the base station may determine the number of CBGs that are 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, in this scheduling, the base station schedules two TBs, TBa and TBb, thus Nmax_CBG_TBi = 2. Taking TBa as an example, assuming that the size of TBa is 5000 and can be divided into 6 Cb, the actual number of CBGs scheduled is 2 (since it is the number of CBs > 1). The first, second, and third CBs constitute a first real CBG, and the fourth, fifth, and sixth CBs constitute a second real CBG.

In another example, as shown on the left of FIG. 4, when only one TB is scheduled by the base station in this scheduling, the first and second CBs constitute the first actual CBG, and the third and fourth CBs are the second. The actual CBG constitutes 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" is a simpler configuration, but the "first CBG configuration" is stronger when the UE misses the DCI and in some cases may improve retransmission efficiency. Some examples are given below.

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

In some embodiments, the number of TBs scheduled at each time point by the base station can be different. For example, the base station may determine Nmax_CBG_TBi according to the number of TBs actually scheduled for transmission. Thus, 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 transmission at retransmission and initial transmission (initial transmission), or at retransmission at different time zones. Alternatively, 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 another time zone.

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

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

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

In another example, the base station schedules 1 TB, which is the initial transmission. At this time, Nmax_CBG_TBa = 4. If TBa transmission fails, the base station schedules to retransmit TB 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 initially schedules the transmitted TBa, Nmax_CBG_TBa = 4, where the first and second CBs constitute a first actual scheduled CBG, and the third and fourth CBs perform a second actual scheduling. Configure the CBG, the fifth CB constitutes the third actual scheduled CBG, and the sixth CB constitutes the fourth actual scheduled CBG. Assume that the UE fails to demodulate CBG2 and successfully demodulates CBG1, 3, 4. The base station schedules CB3-4 when scheduling to retransmit TBa. At this time, Nmax_CBG_TBa = 2. The base station then indicates that the scheduled CBG is CBG1, that is, CB1-4.

According to the second CBG configuration, when the base station initially schedules the transmitted TBa, Nmax_CBG_TBa = 4, where the first and second CBs constitute a first actual scheduled CBG, and the third and fourth CBs perform a second actual scheduling. Configure the CBG, the fifth CB constitutes the third actual scheduled CBG, and the sixth CB constitutes the fourth actual scheduled CBG. Assume that the UE fails to demodulate CBG2 and successfully demodulates CBG1, 3, 4. When the base station schedules to retransmit TBa, CB3-4 are scheduled. At this time, Nmax_CBG_TBa = 2. 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 CB3-4, the base station indicates that the CBGs scheduled at this time are CBG1 and CBG2, i.e. all CBs.

For example, the base station schedules two TBs, initial transmissions, TBa and TBb. 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, 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 initially schedules TBa transmitted, Nmax_CBG_TBa = 2, where CB1 to 3 configure CBG1 that is actually scheduled, and CB4 to 6 configure CBG2 to be actually scheduled. Assuming that the UE fails to demodulate CBG2 but CBG1 successfully demodulates, the base station schedules CB4 to 6 when scheduling the retransmission of TBa. In this case, Nmax_CBG_TBa = 2, and the base station indicates that the scheduled CBG is CBG2.

In another example, the base station schedules two TBs, TBa and TBb, where both 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 may 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 the UE may miss the DCI scheduling the initial transmission of a given TB so that the Nmax_CBG_TBi cannot be determined upon initial transmission. The base station can avoid this confusion through scheduling. For example, the last transmission is the transmission of two TBs. When the base station can determine that the received HARQ-ACK corresponding to the previous transmission is DTX / DTX, the base station reschedules the two TBs when scheduling the next time point. When the last transmission is the transmission of two TBs and the base station can determine that the received HARQ-ACK corresponding to the last transmission was the ACK of the CBG for at least one TB, the base station only one TB, or both TBs. Can be scheduled at the same time.

In another example, the base station schedules one TB, TBa, which is the 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 increasing the number of bits of HARQ-ACK feedback caused by scheduling two 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 scheduling the initial transmission of TBa but cannot determine Nmax_CBG_TBa in the initial transmission when receiving a retransmission of the DCI of TBa and another TB. In contrast, the base station may simultaneously schedule other TBs, such as TBb, where Nmax_CBG_TBa = Nmax_CBG_TBb = 4. To avoid increasing the HARQ-ACK bits, the UE automatically bundles the CBG dimensions such that the number of HARQ-ACK bits fed back by the two TBs continues to be four. Specifically, refer to the section on HARQ-ACK feedback.

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

The method 100 may then proceed to step S130. In operation S130, the base station may transmit downlink control signaling indicating the CBG configuration determined in operation S120. For example, the base station may generate a DCI including CBG scheduling or configuration information according to the scheme described above, 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, the base station may indicate scheduling information independently for each TB. For example, each TB has an independent Modulation and Coding Scheme (MCS) indication, a Redundancy Version (RV) indication, a New Data Indicator (NDI) indication, and the like. In some embodiments, there can be one NDI for each TB, or there can be one NDI each (or bit information with the same effect) for the CBGs of each TB.

In some embodiments, the base station may also indicate scheduling or configuration information for the 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) to indicate whether the corresponding CB / CBG is scheduled.

Assuming that Nmax_CBG = 4 and NTB = 2 should be scheduled, 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. In some embodiments, this CBG is not scheduled if its one bit is toggled based on that bit in the initial transmission scheduling the same TB. In some embodiments, this CBG is scheduled unless this one bit is changed based on the corresponding bit of the initial transmission scheduling the same TB. In some embodiments, the one bit indicates that the CBG is scheduled or unscheduled according to a predetermined value of zero or one.

For an initial transmission, this bit cannot be used to indicate whether the corresponding CB / CBG is scheduled, but rather can be used to indicate that this TB is an initial transmission. For example, when all bits of all CBGs of one TB are toggled based on 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 retransmits. Indicates that That is, in the initial transmission of one TB, each of the bits of each CBGs can be the same value, and all the 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, at the last initial transmission, the base station scheduled only one new TBa with four CBGs. However, in the current transmission, the base station schedules two new TBs, TBb and TBc, and there are two bits, four bits in total, for the two CBGs of each TB. Assuming TBa corresponds to TBb (eg, the HARQ process is the same), 2 bits of TBb are toggled based on 4 bits of TBa, and 2 bits of TBc are toggled based on those of previous TBs of 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 schedules only one new TBa. Assuming 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.

Further, in some embodiments, each CB / CBG has a separate field to indicate whether the corresponding CB / CBG is scheduled if the DCI also includes NDI for 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 should empty the corresponding buffer by explicitly indicating whether it should empty the corresponding buffer or by indicating whether the CB / CBG should be discarded. May have an independent field to implicitly indicate the CBG, or indicate whether each TB uses one bit to have its CB / CBG scheduled by the same DCI need to empty the corresponding buffer, or For example, whether multiple TBs share the same 1 bit and corresponding CB / CBG scheduled by the same DCI need to empty the corresponding buffer. Toggle this field based on the last transmission that scheduled the same TB. , A CB / CBG may indicate that it is a new CBG or a CBG that may need to empty the buffer, and an untoggled field indicates that the CB / CBG does not empty the buffer. Is Ado may indicate that the CBG.

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

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

Type 1 DAI, also known as counter DAI, represents one of the following:

(1) The sum of the number of scheduled CBGs from the HARQ-ACK feedback bundling window to the current scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, the current carrier Ci), or should be fed back. The sum of the number of HARQ-ACK bits to do;

(2) Downlink time unit (e.g., downlink time unit Ti) currently scheduled in the HARQ-ACK feedback bundling window and / or carrier before the last downlink time unit and / or current carrier (e.g., current carrier Ci) 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;

(3) Downlink time unit and / or downlink scheduled in the HARQ-ACK feedback bundling window to the currently scheduled downlink time unit (eg, downlink time unit Ti) and the current carrier (eg, current carrier Ci). 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) prior to the currently 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 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 a set of all carriers and / or a set of all downlink time units with HARQ-ACK / NACKs that can be fed back simultaneously in the same uplink time unit. The present disclosure does not limit the length of downlink time units, for example downlink slots, mini slots, or OFDM symbols. In some embodiments, the first type DAI is counted in granularity of the number of CBGs. When set to TB scheduling mode, one TB may be considered to correspond to one CBG. When a carrier configured for the TB scheduling mode is scheduled and the base station does not set up spatial dimension bundling, the number of CBGs scheduled for this carrier may be considered a fixed value. For example, the number of CBGs scheduled for this carrier may correspond to the maximum number Nmax_TB = 2 of TBs 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 Nmax_CBG of the CBGs of each scheduled downlink time unit and / or downlink carrier may be different. 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 set up bundling of spatial dimensions, Nmax_CBG = 2 for such carriers. If one TB is scheduled, the HARQ-ACK bits of the other TB are dummy bits, and certain values of Nmax_CBG of each carrier set through the CBG scheduling mode may be different from each other when the CBG scheduling mode is set for some of the carriers. have. According to the method of the present invention, values of Nmax_CBG HARQ-ACKs are determined; Or for a carrier established via TB scheduling mode, Nmax_CBG depends on the number of TBs actually scheduled; Nmax_CBG = 1 when only one TB is scheduled and Nmax_CBG = 2 when two TBs are scheduled. It can be easily seen that the DAI of the first type is counted in granularity, the number of CBGs, and the count of TB dimensions is included in the count of CBG dimensions. In this case, regardless of TB scheduling mode or CBG scheduling mode, the first type of DAI is the number of HARQ-ACK bits that all TBs in each PDSCH must provide regardless of whether one TB is scheduled or two TBs are scheduled. Calculate

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

For example, it may be assumed that the length of time of the HARQ-ACK feedback bundling window is one downlink time unit, and there are three carriers before the frequency domain dimension. All three carriers are set up to support scheduling of up to two TBs. In one downlink time unit, the base station can schedule the PDSCH on two of the carriers, where carrier 1 can be configured in a CBG based scheduling scheme and the maximum number of CBGs Nmax_CBG_C1 = 4, and carrier 2 is TB based Can be set to the 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 two TBs, the total number of CBGs scheduled by the two TBs is three; If carrier 1 schedules 1 TB, it is assumed that the total number of CBGs scheduled is six. At this time, as shown in FIG. 5, according to the method of (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 Carrier 1 through Carrier 3 schedule a total of 9 CBGs. When the UE receives the first type DAI of carrier 3, the UE may know that the base station has not scheduled carrier 2. According to the method of (4), the first type DAI = 9 of carrier 1 indicates that carrier 1 is the first scheduled carrier, the first type DAI = 5 of carrier 3 indicates carrier 2 in carrier 1, and is scheduled by the base station. The total sum of the maximum number of CBGs corresponding to each of the carriers is four. When the UE receives the first type DAI of carrier 3, the UE may 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. Assume that the total number of CBGs scheduled is six. At this time, according to the method of (1), the first type DAI of carrier 1 = 3, which indicates that carrier 1 schedules three CBGs; Carrier 1's first type DAI = 5, indicating that a total of 5 CBGs are scheduled for carrier 2 in carrier 1; Carrier 2's first type DAI = 11 indicates that a total of 11 CBGs are scheduled for carrier 3 in carrier 1. It is assumed that the UE has failed to receive the PDCCH of Carrier 2 but received the PDCCHs of Carrier 1 and Carrier 3. Here, when receiving the first type DAI of carrier 3, the UE may know that it has missed the PDCCH of carrier 2, and may determine that carrier 2 actually schedules up to two CBGs. Note that the base station can schedule 1 TB or 2 TBs. However, no matter how many TBs are scheduled by the base station, up to two CBGs are considered to be scheduled.

According to the method of (4), as shown in Fig. 6, the first type DAI of carrier 1 is 1, the first type DAI of carrier 2 is 5 and the first type DAI of carrier 3 is 7. It is assumed that the UE has failed to receive the PDCCH of Carrier 2 but received 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 has failed to receive the PDCCH of Carrier 1 and received the PDCCHs of Carrier 2 and Carrier 3, the UE can know that it missed PDCCh of Carrier 1 when receiving the first type DAI of Carrier 2 . In addition, the UE may determine that carrier 2 schedules only one TB according to PDCCH of carrier 2, but the UE still needs to generate HARQ-ACK for 2 TBs when generating HARQ-ACK, where 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 TB is a dummy bit, which may be a fixed value, which may be a fixed value, for example, NACK / DTX. Alternatively, 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 = 1 of carrier 1 and the first type DAI = 5 of carrier 2, Carrier 3 has a first type DAI = 7. It is assumed that the UE has failed to receive the PDCCH of Carrier 2 but received the PDCCHs of Carrier 1 and Carrier 3. At this time, when generating the HARQ-ACK of the carrier 2, the UE only needs to generate a 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 downlink carrier (eg, downlink carrier Ci) in the HAQR-ACK codebook. It can be used to calculate the starting point of the location.

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 of CBGs (corresponding to (4)). It may be a number.

Corresponding to (1) or (3), 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 is corresponding DAI-downlink time unit Ti and downlink It may correspond to the bit length + 1 of the ACK / NACK of the carrier Ci. 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 of CBGs (corresponding to (3)). It may be a number.

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

In some embodiments, when mapping ACK / NACKs of respective CBGs in one TB, corresponding to (1) or (2), the ACK / NACK of each scheduled CBG is actually of the CBGs 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 CBGs in one TB, the ACK / NACK of each CBG is ascending according to the indices of the CBGs of 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 unscheduled CBG is a dummy bit in which a predetermined value may be used. In addition, the total length of ACK / NACK bits for all TBs of downlink time unit Ti and downlink carrier Ci may be Nmax_CBG.

When the TB scheduling mode is set, corresponding to (1) to (4), ACK / NACK of the first TB may be mapped first, and then ACK / NACK of the second TB may be mapped. The ACK / NACK of a scheduled TB is determined according to the decoding result of that TB. The ACK / NACK of unscheduled TB is a dummy bit in which a predetermined value can be used.

A second type of DAI, also called total DAI, is the total number of bits in a HARQ-ACK codebook, or the current down in the HARQ-ACK feedback bundling window at the first downlink time unit of 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 of all scheduled downlink time units to the current downlink time unit in the HARQ-ACK feedback bundling window. It can represent the total number of the maximum number of CBGs of the carriers, 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 set in CBG based scheduling mode with the maximum number of CBGs Nmax_CBG = 4, and carrier 2 is in TB based scheduling mode. Is set. Assume that carrier 1 schedules two TBs, and the total number of CBGs scheduled by the two TBs is three. If the second type DAI indicates the total number of scheduled CBGs of all carriers scheduled from the first downlink time unit to the current downlink time unit of all downlink time units scheduled for 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 the carriers scheduled from the first downlink time unit to the current downlink time unit of all downlink time units scheduled for the given uplink time unit, then carrier 1 And the second type DAI of carrier 2 is 4 + 2 = 6.

It should be noted that for the first type DAI or the second type DAI, there may be cases where the bit state corresponds to the value of several DAIs due to bit overhead limitations. For example, in an LTE system, the DAI contains only 2 bits, but the actual value represented by the DAI is 1 to 32 or more. In this case, the modulo form 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 the DAI. The size and bit order of the HARQ-ACK codebook is based on the number of quasi-statically set carriers, the HARQ-ACK feedback bundling window, and the number of HARQ-ACK bits of downlink time unit Ti on the semi-statically set downlink carrier Ci. Is determined based on In this case, in the carrier configured for TB scheduling, the number of HARQ-ACK bits is 1 bit when the maximum number of TBs that can be transmitted, for example, the downlink carrier Ci is configured to have at most one TB. If the downlink carrier Ci is set to have only up to 2 TBs, then it is 2 bits, regardless of how many TBs are actually scheduled. For a carrier configured for CBG scheduling, it is fixed at Nmax_CBG_i regardless of the number of TBs.

The above embodiments are mainly described in terms of a base station. For those skilled in the art, according to the above, in order to ensure the correct reception of the UE, the UE determines the received DCI, determines the CBG information therein, and whether it is for one TB or for multiple TBs. To determine whether or not each CBG indication in the DCI corresponds to which CBG of which CB, to determine how the received PDCCH is split into CBs, and how the received PDSCH is combined into the CBG Or the corresponding standards and methods. I will not repeat it here for brevity. In addition, in order to ensure accurate feedback of the HARQ-ACK, the UE determines information of the first type DAI and / or the second type DAI in the received DCI according to the same or corresponding criteria and methods as the base station, 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 may be determined. It is fixed as Nmax_CBG. The details are not described here again for the same reasons.

By using the solution according to the embodiment, the length of the DCI in each scheduling may not change depending on the number of TBs scheduled, which reduces the complexity of blindly detecting the PDCCH by the UE. In addition, when the UE performs HARQ-ACK feedback, the number of HARQ-ACK bits corresponding to the scheduled PDSCH does not change depending on the number of TBs scheduled, thereby reducing the HARQ-ACK feedback overhead. In addition, this means that if one or more PDSCHs are missed by the UE when HARQ-ACKs of PDSCHs of multiple carriers or HARQ-ACKs of PDSCHs of several downlink time units are fed back within one uplink time unit, TBs of missing PDSCHs are lost. Due to the uncertainty of the number of pieces, the size of the HARQ-ACK codebook or the arrangement order thereof can be avoided.

A flowchart of an exemplary method for feeding back HARQ-ACK / NACK will be described in detail below in conjunction with FIG. 2 and other figures. 2 is a flowchart of an example method 200 for feeding back HARQ-ACK / NACK in accordance with an embodiment of the present disclosure. As shown in FIG. 2, the 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 the decoding result of the downlink transmission corresponding to the downlink control signaling and the downlink control signaling. In step S230, the UE may provide, to the base station, HARQ-ACK corresponding to downlink transmission according to the generated HARQ-ACK codebook.

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

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

In some other embodiments, the carrier in which the current downlink time unit is scheduled is set in an operation mode capable of scheduling up to more than one TB, and the carrier in which the current downlink time unit is scheduled is in TB scheduling mode. If set, any of the TBs can 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 still other embodiments, the carrier in which the current downlink time unit is scheduled is set in an operation mode capable of scheduling up to more than one TB, and the carrier in which the current downlink time unit is scheduled is in the CBG scheduling mode. If so, it is determined according to the downlink control information which TB actually schedules the maximum number of CBGs, and the TB is determined to be the reference TB corresponding to the DAI. In some embodiments, if the actual number of scheduled CBGs of the multiple TBs is the same, any one of the multiple TBs may be selected to correspond to the DAI.

In still other embodiments, the carrier in which the current downlink time unit is scheduled is set in an operation mode capable of scheduling up to more than one TB, and the carrier in which the current downlink time unit is scheduled is in the 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 set. For example, any one of the TBs can be selected as the reference TB corresponding to the 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 via PDSCH in the configured mode of operation. The maximum number of TBs present. Usually Nmax_TB may be two. For carriers set in the CBG scheduling mode, NCBG_ref may be the number of CBGs actually scheduled by the reference TB corresponding to the DAI. NCBG_ref may be 1 for carriers set in the TB scheduling mode. In the carriers set in the CBG scheduling mode, the number of HARQ-ACK bits to which each TB can feedback may correspond to the maximum number of configured CBGs Nmax_CBG, and NCBG_ref may be Nmax_CBG.

Alternatively, regardless of whether the scheduled carrier is set to operate in CBG scheduling mode or TB scheduling mode, both the first type and / or second type of DAI will use a fixed TB as a reference. Can be. 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 set in the CBG scheduling mode, Nmax_CBG_ref may be the maximum number of CBGs that can be scheduled by the reference TB corresponding to the DAI. Nmax_CBG_ref may be 1 for carriers set in the TB scheduling mode.

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

Similarly, if 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 this PDSCh, each CBG indication for each TB may be independent. For example, for 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 whether the base station actually schedules 1 TB or 2 TBs. When a base station schedules only one TB, four bits of one unscheduled TB do not represent the information of that TB and are used for other purposes or are only dummy bits. For DCI scheduling such PDSCH, the indication for each CBG of each TB may be used in combination and is not limited in this disclosure.

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

(1) Downlink time units and / or down scheduled, respectively, from the HARQ-ACK feedback bundling window to the currently scheduled downlink time unit (e.g., downlink time unit Ti) and the current carrier (e.g., current carrier Ci). The sum of the number of CBGs (NCBG_ref) actually scheduled by the reference TB of the link carrier;

(2) Downlink time units (e.g., downlink time unit Ti) currently scheduled in the HARQ-ACK feedback bundling window and / or prior to the latest downlink time unit and / or current carrier (e.g., current carrier Ci). The sum of the number of CBGs actually scheduled by the downlink time unit and / or the reference TB of the downlink carrier, each scheduled up to a carrier;

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

(4) prior to the currently scheduled downlink time unit (eg, downlink time unit Ti) and / or the latest downlink time unit and / or current carrier (eg, current carrier Ci) in the HARQ-ACK feedback bundling window. Sum of the maximum number of downlink time units scheduled to the carrier and / or CBGs of the reference TB of the downlink carrier plus 1.

In the embodiment shown in Fig. 2, the second type DAI is a 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 in the HARQ-ACK feedback bundling window; Or to indicate the total number of maximum numbers of CBGs of all carriers scheduled 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 in the HARQ-ACK codebook or the total number of scheduled CBGs or the total number of CBGs is equal to the second type DAI and Nmax_TB when the base station does not set up bundling of spatial dimensions. It may correspond to the product of. In some embodiments, when the base station sets up bundling of spatial dimensions, the total number of bits in 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 can be used to calculate the starting point of the bit position of the ACK / NACK bits for the currently scheduled downlink time unit in the HARQ-ACK codebook. For example, in some embodiments when the base station does not set up bundling of spatial dimensions, when Nmax_TB = 2 corresponding to (2) or (4), downlink time unit Ti and 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 two. 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 that of the corresponding DAI-downlink time unit Ti and downlink carrier Ci. NCBG_ref, which can then be multiplied by 2 and added by 1. Corresponding to (3), 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 that of the corresponding DAI-downlink time unit Ti and downlink carrier Ci. Nmax_CBG_ref, which may then be multiplied by 2 and added by 1.

Further, in other embodiments, corresponding to (2) or (4), 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 determined by the base station to be spatial. When setting the bundling of the dimension may 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 that of the corresponding DAI-downlink time unit Ti and downlink carrier Ci. It may correspond to NCBG_ref + 1. Corresponding to (3), 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 that of 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 set up bundling of spatial dimensions, when the UE feeds back ACK / NACK of downlink time unit Ti and downlink carrier Ci, ACK / NACK of CBG in 1TB may be mapped first, and then ACK / NACK of CBG in 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 indices of the CBG actually scheduled. When the number of CBGs scheduled by two TBs is different, a dummy bit may be sent for a TB with a smaller number of CBGs, such that the number of ACK / NACK bits in TBs is equal to NCBG_ref. For example, two TBs are scheduled, CBG 1, 2, 3 are scheduled by TBa, and CBG 2 and 4 are scheduled by TBb. At this time, NCBG_ref = 3 and 6-bit ACK / NACK is fed back. First, ACK / NACK of three CBGs of TBa are mapped, ACK / NACK bits of second and fourth CBGs of TBb are mapped next, and a dummy bit of 1 bit is finally mapped.

Corresponding to (3) or (4), when mapping the ACK / NACKs of the respective CBGs in one TB, the ACK / NACK bits of each CBG may be mapped in ascending order according to the index of the CBG of the TB. . The ACK / NACK of the scheduled CBG is determined according to the decoding result of the CBG. The ACK / NACK of the unscheduled CBG may be a dummy bit in which a predetermined value may be used, and accordingly, the number of ACK / NACK bits of each TB corresponds to Nmax_CBG_ref (1) to (4). ACK / NACK of non-TBs may be dummy bits for which a predetermined value may be used.

Further, if the base station sets bundling of spatial dimensions, when the UE feeds back ACK / NACK of downlink time unit Ti and downlink carrier Ci, if the TB scheduling mode is set, ACK / NACK of each scheduled TB The bits may be ANDed. Alternatively, ACK / NACKs for unscheduled TBs can be set to ACKs, and ACK / NACKs for each TB can be ANDed. Once the CBG scheduling mode is set, ACK / NACKs scheduled in each TB and having the same CBG index may be ANDed, that is, unscheduled CBGs do not participate in the AND operation. In this case, 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 rational manner, when the configured CBG scheduling mode adopts spatial dimension bundling, and when two TBs are scheduled, the UE may indicate that downlink scheduling signaling indicates whether the corresponding CB / CBG is scheduled. It can be considered that the bits are common for two TBs, ie 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 via signaling, which can be applied for both TB scheduling mode and CBG scheduling mode. Alternatively, bundling of spatial dimensions can be set independently through two signalings. Or, there is only one signaling for the TB scheduling mode, indicating that as the default for the CBG scheduling mode 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 the AND operation. For CBGs not scheduled in each TB, the ACK / NACK may be a dummy bit. For example, if two 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 four CBGs. The first bit of ACK / NACK is the result of the AND operation of ACK / NACKs for TBa # 1 CBG and TBb # 1 CBG, and the second bit of ACK / NACK is ACK / NACK for TBb # 2 CBG, and the ACK The third bit of / NACKs is ACK / NACK of TBb # 3 CBG, and the fourth bit is a dummy bit. Alternatively, ACK / NACKs of unscheduled CBGs are ACKs, and ACK / NACKs of CBGs having the same CBG index in each TB may be ANDed.

Corresponding to (1) or (2), for each TB, the virtual CBG index j may be obtained in ascending order according to the indices of the CBGs that are actually scheduled. In this case, according to the virtual CBG index, ACK / NACKs of CBGs having the same CBG index in each TB may be ANDed. Alternatively, the ACK / NACKs of CBGs that are actually scheduled with the same CBG index within each TB may be ANDed. If the CBG indexes actually scheduled by each TB are different, then the indexes of the CBGs that are actually scheduled are sorted in ascending order according to the indexes of the CBGs that are actually scheduled to obtain a virtual CBG index j, and within each TB ACK / NACKs of CBGs having the same CBG index are ANDed according to the virtual CBG index.

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

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

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

According to the method of (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 of carrier 1 and carrier 2 Type DAI may be three. 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 the detection result of the scheduled CBG.

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

According to the 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 bitmap of ACK / NACK may be the same as the bitmap of ACK / NACK in (1).

According to the method (3), in the example of FIG. 7, if Nmax_CBG_C1 indicates 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, Assuming a TB has four CBGs, internal 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 may be selected as the reference TB, where the first type DAI for negative carrier 1 is two. 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 two TBs and carriers in the TB scheduling mode, the counts of the first type DAIs are the count of the reference TB, but the carriers of the CBG scheduling mode that actually schedules one TB. It can be readily seen that the counts of DAIs are divided by 2 the number of CBGs for this TB. In another situation, as shown in FIG. 10, carrier 1 schedules at most two TBs, and carrier 1 actually schedules only TBa, i.e., the third CBG. At this time, the HARQ-ACK fed back by the TB has 4 bits. The third bit determines the 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. The 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 indicates 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, carrier 1 and carrier The second type DAI of 2 may be five. 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 scheduled detection result of the # 3 CBG, and bits 1, 2, and 4 are dummy bits. TBb has a 4-bit ACK / NACK, bits 4 and 6 in the HARQ-ACK codebook determine ACK / NACK values based on detection results of scheduled # 1 CBG and # 2 CBG, and bits 7 and 8 It is a dummy bit. In some embodiments, carrier 2 uses 2 bits and TBc has 1 bit ACK / NACK. The ninth bit in the HARQ-ACK codebook determines the ACK / NACK value according to the scheduled detection result of TBc, and the tenth bit in the HARQ-ACK codebook is a dummy bit.

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

It should be noted that for type 1 or type 2 DAIs, there may be cases where the bit state corresponds to the value of several DAIs due to bit overhead limitations. For example, in an LTE system, the DAI contains only 2 bits, but the actual value indicated by the DAI may be 1 to 32 or more. In this case, the modulo form 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 one step. Assume that Nmax_CBG can have values 2 and 4. At this time, the step is two. The second type DAI = "000" means that the value of DAI is 2, ... 16 * (M-1) +2, and that 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, and 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 embodiment has been described mainly on the UE side. However, in order to ensure correct reception of HARQ-ACK, the base station also depends on the same or corresponding criteria and methods as the UE, and upon the size of the HARQ-ACK codebook and the mapping of the ACK / NACK bits when the HARQ-ACK codebook is received, It can be seen that it is not difficult to determine the value of the first type DAI and / or the second type DAI in the DCI transmission.

In some embodiments, if the base station sets up at least one carrier for the UE in CBG scheduling mode, the base station cannot simultaneously set up HARQ-ACK spatial bundling for the carrier that is set up with the CBG scheduling mode for the UE.

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

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

When 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 unscheduled TB sends Nmax_CBG_TBi dummy bits, where the predetermined dummy bit may be NACK or ACK.

If Nmax_harq = Nmax_CBG and Nmax_CBG is the maximum number of CBGs for one TB scheduled at the same time, the sum of the numbers of HARQ-ACK bits corresponding to all TBs scheduled at the same time may be Nmax_CBG according to the method described below. . For example, when two TBs are scheduled, the number of HARQ-ACK bits in each TB is Nmax_CBG / 2 = 2 even if the maximum number of CBGs that can be scheduled by each TB is Nmax_CBG = 4. In one implementation manner, HARQ-ACKs of multiple CBGs may be ANDed according to a predetermined rule, that is, 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 the 1TB are ANDed to obtain 1 bit HARQ-ACK, and HARQ of the last two CBGs. -ACKs are ANDed together to get 1 bit HARQ-ACK. HARQ-ACKs of the first two CBGs of the 2TB are ANDed to obtain 1 bit HARQ-ACK, and the HARQ-ACK of the 3rd 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 the DAI indicates that a total of three CBGs are scheduled or indicates that 3 bits of HARQ-ACK must be fed back for scheduling, bundling is not necessary. In another example, assume that when two TBs are scheduled, the first TB schedules four CBGs and the second TB schedules a third CBG. Assuming that the DAI indicates that there are three scheduled CBGs or indicates that 3 bits of HARQ-ACK should be fed back for scheduling, the HARQ-ACKs of the first and second CBGs of the 1 TB are bundled and the third of the first TB And HARQ-ACKs of fourth CBGs are bundled, and the third CBG of the second TB generates one bit HARQ-ACK.

CBGs of other TBs are preferably not bundled.

Preferably, unscheduled CBGs do not participate in bundling. For example, suppose that when two TBs are scheduled, the first TB schedules the first, third and fourth CBGs and the second TB schedules the first CBG. When the second CBG of the first TB does not participate in bundling. The first CBG corresponds to a one bit HARQ-ACK, and the third and fourth CBGs are calculated to obtain a one bit HARQ-ACK, and the first CBG of the second TB is 1. Corresponds to the bit HARQ-ACK and generates a 1-bit dummy bit. The dummy bit is a predetermined value, for example the value of NACK.

It is desirable that unscheduled CBGs do not participate in bundling. Unscheduled CBG corresponds to ACK if it was previously scheduled and correctly decoded, otherwise it corresponds to NACK.

The bundling of the above-described CBG dimensions may be combined with the method of the first type DAI / second type DAI of the present invention. As shown in FIG. 11, the DAI performs counting with subdivisions of CBGs and counts the number of CBGs for all TBs of each PDSCH. Assuming carrier 1 schedules the total number of bits Nmax_harq = 4 for HARQ-ACK feedback, the base station schedules two TBs, each TB can be divided into four CBGs, and TBa is the third CBG. And TBb schedules the first and second CBGs. Carrier 2 schedules TBc. In this case, the first type DAI of the carrier 1 is 1, the first type DAI of the carrier 2 is 5, the second type DAI of the carrier 1 and the carrier 2 is 5, and the size of the HARQ-ACK codebook fed back by the UE 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, The first bit is a result of the logical product operation of ACK / NACK as the detection result of CBG1 and CBG2, and the second bit of TBb is a dummy bit. Carrier 2 uses 1 bit and TBc has 1 bit ACK / NACK. The fifth bit in the HARQ-ACK codebook determines the ACK / NACK value according to the detection result of the scheduled TBc. In this example, even though carrier 2 may schedule up to two TBs, the number of HARQ-ACK bits of carrier 2 is determined according to the number of TBs actually scheduled. According to another method of the present invention, if the HARQ-ACK code length set for the carrier set at the time of TB scheduling is 2, the size of the HARQ-ACK codebook of this example is 6 bits, of which the sixth bit is a dummy bit.

The HARQ-ACK codebook through the above methods may vary depending on the number of scheduled carriers and the number of scheduled downlink time units.

In addition, in another scheme for determining a HARQ-ACK codebook, the size of the HARQ-ACK codebook is a set / activated downlink carrier or downlink time unit that feeds back HARQ-ACKs to a given uplink time unit / uplink carrier. It can be determined by the number of. It may also be determined by the maximum number of CBGs of these downlink carriers / downlink time units. That is, three dimensions may 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 set to operate in a multi-TB operating mode and the base station does not set up bundling for spatial dimensions, then the size of the HARQ-ACK codebook adds three dimensions and is the maximum of TBs that can be scheduled. It can be based on multiplying 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 sets up bundling of spatial dimensions, 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 third type DAI is the same as the content indicated by the second type DAI, or represents the total number of bits of the HARQ-ACK / NACK codebook that the third type DAI expects to receive, The total number of bits of HARQ-ACK / NACK corresponding to the PDSCH actually scheduled is less than 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.

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

Further, in some embodiments, when the UE is configured to perform CBG based HARQ-ACK feedback, the CRC checksum of each CBG in one TB is correct, which may cause the CRC checksum of the TB to fail. To at least partially alleviate or alleviate 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 feedback the HARQ-ACK of the CBG but also feedback the HARQ-ACK of the TB. The 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 the ACK / NACK bits of TB1, the ACK / NACK bits of # 1 CBG of TB1, 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, ..., ACK / NACK bits of #Nmax_CBG CBG of TB2, where Nmax_CBG is the maximum number of CBGs of each TB.

2nd HARQ-ACK feedback

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

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

Further, in some embodiments, if the current scheduling includes only a portion of the TB, i.e., if some of the CBGs of one TB have been scheduled so far, then the UE may check that all CBGs of the TB have a CRC check for each CBG. It is found that the TB is correctly detected by the thumb but the CRC checksum for the TB is not. 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 TB;

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

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

For example, the scheduled CBG may determine the ACK / NACK value according to the CRC checksum of the corresponding CBG, and the ACK / NACK value of the CBG that is not scheduled but correctly decoded 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 value of all CBGs of the TB to NACK. For example, it can be assumed that the maximum number of CBGs that can be scheduled is four. In downlink time unit T1, the base station schedules an initial transmission of TB divided into four CBGs. If the UE receives a TB, in which the CRC checksums of # 1 CBG and # 2 CBG fail and the CRC checksums of # 3 CBG and # 4 CBG fail, the HARQ-ACK fed back by the UE is NACK, It may be NACK, ACK, or ACK. The base station schedules retransmission of the TB scheduling the # 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 may be NACK, NACK, NACK, NACK in this case.

Furthermore, in some embodiments, if the current scheduling includes only a portion of the TB, i.e., some of the CBGs of one TB are scheduled, so far the UE has indicated that all CBGs in the TB have a CRC checksum for each CBG. If it is detected correctly by the terminal, but the CRC checksum for the TB knows that the TB is not detected correctly, the UE can 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 the ACK / NACKs of other CBGs are the values of dummy bits.

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

In some embodiments, the UEE checks the CRC of the TB only if the CRC for all CBGs of the TB is correct.

The method in this embodiment can be used in combination with the embodiment shown in FIG. 1 and / or the embodiment shown in FIG. 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 example hardware configuration of an example network node and / or user equipment in accordance with an embodiment of the present disclosure. Hardware configuration 1200 may include a processor 1206. The processor 1206 may be a single processor unit or a plurality of processing units for performing various operations of the flows described herein. The configuration 1200 may also include an input 1202 for receiving signals from other entities and an output 1204 for providing signals to other entities. The input unit 1202 and the output unit 1204 may be composed of a single entity or separate entities.

In addition, this configuration 1200 is at least in the form of nonvolatile or volatile memory, such as electrically erasable programmable read only memory (EEPROM), flash memory, optical disks, Blu-ray disks, and / or hard disk drives. One readable storage medium 1208 may be included. When the readable storage medium 1208 is executed by the processor 1206 in the configuration 1200, an apparatus including the hardware configuration 1200 and / or the hardware configuration 1200 may be associated with FIGS. 1 and / or 2. Computer program 1210 which may include code / computer readable instructions to perform the processes described above and all variations thereof, and the like.

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

Further, in an example embodiment in which hardware configuration 1200 is used as a user device, the code in the computer program of configuration 1200 may include a module 1210A for receiving downlink control signaling. The code in the computer program includes a module for generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission ( 1210B). 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 for carrying out the various steps of the various methods disclosed herein may be included in the computer program 1210.

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

The code means in the embodiments disclosed above in connection with FIG. 12 are implemented as computer program modules that, when executed in the processor 1206, cause the hardware configuration 1200 to perform the operations described above in connection with 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.

The processor may be one central processing unit (CPU), but may also include two or more processing units. For example, the 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 include on-board memory for caching purposes. The computer program may be executed by a computer program product coupled to the processor. The computer program product may include a computer readable medium having stored thereon the computer program. For example, the computer program product may be flash memory, RAM, ROM, EEPROM, and in other embodiments may be distributed in the form of memory in the program product to UE different computers.

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

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

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

The processor 1310 may include one or more processors or other processing devices that control the proposed function, process, and / or method. Operation of the network node and / or user equipment according to an embodiment of the present disclosure may be implemented by the processor 1310.

When the hardware configuration 1300 performs an operation of a network node, the processor 1310 may determine the number of transport blocks (TBs) that may be scheduled in downlink transmissions and the division of coding block groups (CBGs) that may be split in the downlink transmissions. Based on the maximum number, the maximum number of splittable CBGs in each TB of the downlink transmission may be determined. The processor 1310 may determine the CBG configuration of the CBGs scheduled in the TB based on the maximum number of CBGs that can be split in 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 a user device, the processor 1310 may control the transceiver 1320 to receive downlink control signaling. The processor 1310 may generate a HARQ-ACK codebook according to downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission. The processor 1310 may control the transceiver 1320 to transmit the HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook.

The transceiver 1320 may include an RF transmitter for upconverting and amplifying the transmitted signal and an RF receiver for downconverting the frequency of the received signal. However, according to another embodiment, the transceiver 1320 may be implemented with more or fewer components than the components shown.

The transceiver 1320 may be connected to the processor 1310 to transmit and / or receive a signal. The signal may include control information and data. In addition, 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 wireless channel.

The memory 1330 may store control information or data included in a signal obtained by the hardware configuration 1300. The memory 1330 may be connected to the processor 1310 and store at least one instruction, protocol, or parameter for a proposed function, process, and / or method. The 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 elements.

The present disclosure has been described with reference to preferred embodiments so far. Those skilled in the art will appreciate that various other changes, substitutions, and additions can occur without departing from the spirit and scope of the present disclosure. Accordingly, 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, the functions described herein as implemented by pure hardware, pure software, and / or firmware may be implemented using dedicated hardware, a combination of general hardware and software, and the like. For example, functions described as being implemented through dedicated hardware (e.g., Field Programmable Gate Arrays (FPGAs), application specific integrated circuits (ASICs, etc.)) may include central processing units (CPUs) and digital signal processing (DSPs). It can be implemented by general-purpose hardware and software such as vice versa and vice versa.

Claims (15)

A method in which a network node schedules downlink transmissions, the method comprising:
Based on the number of transport blocks (TBs) that can be scheduled in downlink transmission and the maximum number of splittable coding block groups (CBGs) in the downlink transmission, the number of CBGs that can be split in each TB for the downlink transmission Determining a maximum number;
Determining a CBG configuration of CBGs scheduled in a TB based on the maximum number of CBGs splittable in each TB for the downlink transmission; And
Transmitting downlink control signaling indicative of the CBG configuration. The method of claim 1,
The maximum number of splittable CBGs in the downlink transmission is set through higher layer signaling and does not change according to the maximum number of TBs that can be scheduled in the downlink transmission.
The maximum number of TBs that can be scheduled is set by higher layer signaling or physical layer signaling. 2. The method of claim 1, wherein each of the downlink transmissions is based on a number of transport blocks (TBs) to be scheduled in downlink transmissions and a maximum number of splitting coding block groups (CBGs) in the downlink transmissions. Determining the maximum number of CBGs that can be split in the TB of,
When the downlink transmission schedules only one TB, determining the maximum number of CBGs that can be split in the one TB equal to the maximum number of CBGs that can be split during the downlink transmission; And
If the downlink transmission can schedule two TBs, the splittable of each of the two TBs is such that the sum of the maximum number of splittable CBGs of the two TBs is equal to the maximum number of splittable CBGs in the downlink transmission. Determining at least one of the maximum numbers of CBGs,
Wherein the maximum number of splittable CBGs of the two TBs is equal to or different from each other. The method according to claim 1, wherein the downlink control signaling indicating the CBG configuration,
An independent field for each CBG indicating whether the corresponding CBG is scheduled;
An independent field for each CBG indicating whether a Hybrid Automatic Repeat Request (HARQ) buffer for the CBG should be empty;
An independent field in which a plurality of CBGs indicate whether a Hybrid AutomaticRepeat reQuest (HARQ) buffer for corresponding CBGs should be empty;
Downlink allocation index (DAI) of a first type; And
At least one of a second type of DAI. The method of claim 1, wherein the first type of downlink allocation index (DAI) is
The sum of the number of CBGs scheduled in the HARQ-ACK feedback bundling window up to the current scheduled downlink time unit and the current carrier;
A sum of the number of CBGs scheduled in the HARQ-ACK feedback bundling window up to the current scheduled downlink time unit and / or the last downlink time unit and / or the current carrier previous carrier;
A value of the sum of the maximum number of downlink time units and / or the CBGs of the downlink carriers scheduled in the HARQ-ACK feedback bundling window up to the current carrier; And
The sum of the maximum number of CBGs of the downlink time unit and / or downlink carrier scheduled in the HARQ-ACK feedback bundling window to the current scheduled downlink time unit and / or the last downlink time unit and / or the current carrier previous carrier. A method of representing one of the values plus one. The method of claim 1, wherein the second type of DAI,
The total number of bits in the HARQ-ACK codebook;
The total number of scheduled CBGs of all scheduled carriers from the first downlink time unit of all scheduled downlink time units to a current downlink time unit in the HARQ-ACK feedback bundling window; And
Indicating one of the total number of CBGs of all scheduled carriers from the first downlink time unit of all scheduled downlink time units to a current downlink time unit in the HARQ-ACK feedback bundling window. A network node that schedules downlink transmissions,
Based on the number of transport blocks (TBs) that can be scheduled in downlink transmissions and the maximum number of splitting coding block groups (CBGs) in the downlink transmissions, the maximum number of CBGs that can be split in each TB of the downlink transmissions A coding block group maximum number determining unit configured to determine the number;
A CBG configuration determination unit configured to determine a CBG configuration of CBGs scheduled in the TB based on the maximum number of CBGs that can be split in each TB of the downlink transmission; And
And a control signaling transmitter configured to transmit downlink control signaling indicating the CBG configuration. In the method for the user equipment (UE) reports a HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment),
Receiving downlink control signaling;
Generating a HARQ-ACK codebook according to the downlink control signaling, a reference transport block in downlink transmission corresponding to the downlink control signaling, and a decoding result for downlink transmission; And
Transmitting a HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook. The method of claim 8, wherein the downlink control signaling,
Downlink allocation index (DAI) of a first type;
DAI of the second type;
Information used to determine the number of transport blocks based on which the HARQ-ACK is fed back;
A maximum number of splittable coding block groups (CBGs) in the transport block (TB); And
And at least one of information about whether the HARQ-ACK feedback performs spatial dimension bundling. 10. The method of claim 9, wherein in the same uplink transmission, the number of transport blocks having at least one carrier that can be scheduled to feed back HARQ-ACK is greater than one.
If the downlink control signaling indicates that spatial dimension bundling is not performed, the number of transport blocks based on which HARQ-ACK is fed back is equal to two;
If 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 determined to be equal to one. The method of claim 10, wherein the bit length of the ACK / NACK for the downlink transmission,
A product of the maximum number of splittable CBGs in one TB and the number of transport blocks based on which HARQ-ACK is fed back;
And determined by 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. 12. The method of claim 11, wherein the reference transport block is a transport block having a maximum number of CBGs that are actually scheduled. The method of claim 9, wherein the generating of the HARQ-ACK codebook according to the downlink control signaling, the reference transport block in the downlink transmission corresponding to the downlink control signaling, and the decoding result for the downlink transmission includes: ,
Determining, according to the first type DAI of the downlink control signaling, a start point of a bit position of an ACK / NACK of the downlink transmission in the HARQ-ACK codebook;
According to the first type DAI of the downlink control signaling, determining the start point of the bit position of the ACK / NACK of the downlink transmission in the HARQ-ACK codebook
Determining a start point of a bit position of an ACK / NACK of the downlink transmission in the HARQ-ACK codebook as the first type DAI of the downlink control signaling;
Determining a starting point of a bit position of an 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 ACK / NACK of the downlink transmission + 1;
The start point of the bit position of the ACK / NACK of the downlink transmission in the HARQ-ACK codebook is the product of the number of transport blocks based on the feedback of the first type DAI of the downlink control signaling and the HARQ-ACK. Determining as; And
The start point of the bit position of the ACK / NACK of the downlink transmission in the HARQ-ACK codebook is a product of the number of transport blocks based on the feedback of the first type DAI of the downlink control signaling and the HARQ-ACK. Determining as bit length + 1 of the ACK / NACK of the link transmission. The method of claim 9, wherein the generating of the HARQ-ACK codebook according to the downlink control signaling, the reference transport block in the downlink transmission corresponding to the downlink control signaling, and the decoding result for the downlink transmission includes: ,
When all CBGs of one TB are scheduled by downlink transmission, if it is determined that all CBGs of the TB are correctly detected by CRC checksums for each CBG: the TB is in the CRC checksum for the TB. Generating an NACK value for each of the CBGs of the TB if not correctly detected, and generating an ACK value for each of the CBGs of the TB if the TB is correctly detected by a CRC checksum for the TB. ;
The current downlink transmission does not include all CBGs of one TB, but all TBs of the TB up to the current scheduling time are correctly detected by CRC checksums for each CBG, but the TB is a CRC checksum If not detected correctly by the ACK / NACK, a NACK value is generated for each of the CBGs of the TB; NACKs are generated for each CBGs that were previously fed back with ACKs but not scheduled in the current scheduling; And at least one of generating an ACK / NACK value that is opposite to the value of the predetermined dummy bit for each of the CBGs that were previously fed back with ACKs but not scheduled in the current scheduling. A user device (UE) for feeding back a HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment),
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 in downlink transmission corresponding to the downlink control signaling, and a decoding result for the downlink transmission; And
And a feedback unit configured to feed back a HARQ-ACK corresponding to the downlink transmission according to the generated HARQ-ACK codebook.

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