CN117121411A - Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, HARQ-ACK information receiving method, and base station - Google Patents
Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, HARQ-ACK information receiving method, and base station Download PDFInfo
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Abstract
The UE is capable of receiving a first PDSCH based on first scheduling information related to a first priority, receiving a second PDSCH based on second scheduling information related to a second priority, generating first HARQ-ACK information having the first priority based on reception of the first PDSCH, generating second HARQ-ACK information having the second priority based on reception of the second PDSCH, overlapping a transmission of the first HARQ-ACK for the first PDSCH with downlink symbols in a first slot determined based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH, deferring the transmission of the first HARQ-ACK having the first priority to a third slot, and deferring the transmission of the second HARQ-ACK having the second priority to a fourth slot based on the transmission of the second HARQ-ACK overlapping downlink symbols in the second slot determined based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH.
Description
Technical Field
The present disclosure relates to a wireless communication system.
Background
Various technologies such as machine-to-machine (M2M) communication, machine Type Communication (MTC), and various devices requiring high data throughput, for example, smart phones and tablet Personal Computers (PCs), have emerged and become popular. Thus, the data throughput required to be processed in cellular networks increases rapidly. To meet such a rapid increase in data throughput, a carrier aggregation technique or a cognitive radio technique for effectively employing more bands and a Multiple Input Multiple Output (MIMO) technique or a multiple Base Station (BS) cooperation technique for improving the data capacity transmitted on limited frequency resources have been developed.
As more and more communication devices require greater communication capacity, enhanced mobile broadband (eMBB) communication relative to conventional Radio Access Technologies (RATs) is required. In addition, large-scale machine type communication (mctc) for providing various services anytime and anywhere by connecting a plurality of devices and objects to each other is one of the main problems to be considered in next-generation communication.
Communication system designs that consider reliability and delay sensitive service/User Equipment (UE) are also being discussed. The introduction of next generation RATs is being discussed considering emmbb communication, mctc, ultra Reliable Low Latency Communication (URLLC), etc.
Disclosure of Invention
Technical problem
With the introduction of new radio communication technologies, the number of UEs to which a BS should provide services in a prescribed resource region is increasing, and the amount of data and control information transmitted/received by/from the BS to/from the UEs providing services is also increasing. Since the amount of resources available to the BS for communication with the UE is limited, a new method for the BS to efficiently receive/transmit uplink/downlink data and/or uplink/downlink control information using limited radio resources is required. In other words, due to the increase in the density of nodes and/or the density of UEs, a method of efficiently using high-density nodes or high-density UEs for communication is needed.
There is also a need for a method of efficiently supporting various services having different requirements in a wireless communication system.
For applications where performance is delay/delay sensitive, overcoming the delay or latency is an important challenge.
It is necessary to appropriately define how to transmit HARQ-ACK information of different priorities according to various scenarios.
The objects to be achieved with the present disclosure are not limited to those specifically described above, and other objects not described herein will be more clearly understood by those skilled in the art from the following detailed description.
Technical proposal
In an aspect of the present disclosure, a method of transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) information by a User Equipment (UE) in a wireless communication system is provided. The method may include: receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority; receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a UE configured to transmit HARQ-ACK information in a wireless communication system is provided. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: receiving a first PDSCH based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a processing apparatus is provided. The processing device may include: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: receiving a first PDSCH based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium may be configured to store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a UE. The operations may include: receiving a first PDSCH based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a computer program stored in a computer readable storage medium is provided. The computer program may include at least one program code including instructions that, when executed, cause at least one processor to perform operations. The operations may include: receiving a first PDSCH based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a method of receiving HARQ-ACK information by a Base Station (BS) in a wireless communication system is provided. The method may include: transmitting first scheduling information related to a first priority and second scheduling information related to a second priority to a UE, wherein the second priority is higher than the first priority; transmitting a first PDSCH to the UE based on the first scheduling information; transmitting a second PDSCH to the UE based on the second scheduling information; determining a first slot for receiving first HARQ-ACK information for the first PDSCH having the first priority based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for receiving second HARQ-ACK information for the second PDSCH having the second priority based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying reception of the first HARQ-ACK information having the first priority to a third time slot based on the reception of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying reception of the second HARQ-ACK information having the second priority to a fourth time slot based on the reception of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In another aspect of the present disclosure, a BS configured to receive HARQ-ACK information in a wireless communication system is provided. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations. The operations may include: transmitting first scheduling information related to a first priority and second scheduling information related to a second priority to a UE, wherein the second priority is higher than the first priority; transmitting a first PDSCH to the UE based on the first scheduling information; transmitting a second PDSCH to the UE based on the second scheduling information; determining a first slot for receiving first HARQ-ACK information for the first PDSCH having the first priority based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for receiving second HARQ-ACK information for the second PDSCH having the second priority based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying reception of the first HARQ-ACK information having the first priority to a third time slot based on the reception of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying reception of the second HARQ-ACK information having the second priority to a fourth time slot based on the reception of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In each aspect of the disclosure, each of the first PDSCH and the second PDSCH may be a PDSCH based on semi-persistent scheduling.
In each aspect of the disclosure, for a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, the operations may include: the earliest time slot including the first HARQ-ACK information for which the first physical uplink channel with the first priority does not overlap with downlink symbols is determined as the third time slot. For a BS, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, the operations may include: the earliest time slot including the first HARQ-ACK information for which the first physical uplink channel with the first priority does not overlap with downlink symbols is determined as the third time slot.
In each aspect of the disclosure, the first physical uplink channel may be a Physical Uplink Control Channel (PUCCH) for a semi-persistent scheduling configuration related to the first PDSCH.
In each aspect of the disclosure, for a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, the operations may include: determining a third physical uplink channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being the same as the fourth time slot; and transmitting the first HARQ-ACK information and the second HARQ-ACK information on the third physical uplink channel in the third time slot based on the third physical uplink channel not overlapping downlink symbols. For a BS, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, the operations may include: determining a third physical uplink channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being the same as the fourth time slot; and receiving the first HARQ-ACK information and the second HARQ-ACK information on the third physical uplink channel in the third slot based on the third physical uplink channel not overlapping downlink symbols.
In each aspect of the disclosure, the third physical uplink channel may be determined based on the number of bits in the first and second HARQ-ACK information and a PUCCH configuration for the second priority.
In each aspect of the disclosure, the operations may include: determining an earliest time slot in which a first physical uplink channel including the first HARQ-ACK information for HARQ-ACK information having the first priority does not overlap downlink symbols and the first physical uplink channel does not overlap in time with a second physical uplink channel having the second priority as the third time slot.
The above-described solutions are only a part of examples of the present disclosure, and various examples into which technical features of the present disclosure are incorporated may be derived and understood by those skilled in the art from the following detailed description.
Advantageous effects
According to some implementations of the present disclosure, wireless communication signals may be efficiently transmitted/received. Thus, the overall throughput of the wireless communication system may be improved.
According to some implementations of the present disclosure, various services having different requirements may be efficiently supported in a wireless communication system.
According to some implementations of the present disclosure, the delay/delay generated during radio communication between communication devices may be reduced.
Hybrid automatic repeat request acknowledgement (HARQ-ACK) deferral may also be performed for HARQ-ACK transmissions of different priorities, according to some implementations of the present disclosure.
According to some implementations of the present disclosure, time slots in which HARQ-ACK transmissions of different priorities are different and transmitted may be determined.
Effects according to the present disclosure are not limited to those specifically described above, and other effects not described herein will be more clearly understood by those skilled in the art to which the present disclosure pertains from the following detailed description.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, illustrate examples of implementations of the disclosure and together with the detailed description serve to explain implementations of the disclosure:
fig. 1 shows an example of a communication system 1 to which an implementation of the present disclosure is applied;
fig. 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure;
fig. 3 illustrates another example of a wireless device capable of performing an implementation of the present disclosure;
fig. 4 shows an example of a frame structure used in a 3 rd generation partnership project (3 GPP) based wireless communication system;
Fig. 5 shows a resource grid of time slots;
fig. 6 shows a slot structure used in a 3GPP based system;
fig. 7 illustrates an example of Physical Downlink Shared Channel (PDSCH) Time Domain Resource Assignment (TDRA) caused by a Physical Downlink Control Channel (PDCCH) and an example of Physical Uplink Shared Channel (PUSCH) TDRA caused by the PDCCH;
fig. 8 illustrates a hybrid automatic repeat request-acknowledgement (HARQ-ACK) transmission/reception process;
fig. 9 shows an example of multiplexing Uplink Control Information (UCI) with PUSCH;
fig. 10 illustrates an example of a process of a UE having overlapping Physical Uplink Control Channels (PUCCHs) in a single slot to handle a collision between UL channels;
fig. 11 illustrates a case of performing UCI multiplexing based on fig. 9;
fig. 12 shows a process of a UE having overlapping PUCCHs and PUSCHs in a single slot to handle collision between UL channels;
fig. 13 illustrates UCI multiplexing considering a timeline condition;
fig. 14 illustrates an exemplary HARQ-ACK deferral;
fig. 15 illustrates an operational flow of a UE in accordance with some implementations of the present disclosure;
fig. 16 illustrates HARQ-ACK deferral for high (or higher) priority HARQ-ACKs and low (or lower) priority HARQ-ACKs, according to some implementations of the present disclosure;
Fig. 17 illustrates a flow of HARQ-ACK deferral for transmitting HARQ-ACKs with different priorities in accordance with some implementations of the present disclosure;
fig. 18 illustrates an operational flow of a Base Station (BS) according to some implementations of the present disclosure; and
fig. 19 illustrates a flow of HARQ-ACK deferral for receiving HARQ-ACKs with different priorities, according to some implementations of the present disclosure.
Detailed Description
Hereinafter, an implementation according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description set forth below with reference to the appended drawings is intended to illustrate exemplary implementations of the present disclosure and is not intended to show the only implementations that can be implemented according to the present disclosure. The following detailed description includes specific details in order to provide a thorough understanding of the present disclosure. It will be apparent, however, to one skilled in the art that the present disclosure may be practiced without these specific details.
In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, focusing on important features of the structures and devices, so as not to obscure the concepts of the present disclosure. The same reference numbers will be used throughout this disclosure to refer to the same or like parts.
The techniques, apparatuses and systems described below may be applied to various wireless multiple access systems. For example, multiple-access systems may include Code Division Multiple Access (CDMA) systems, frequency Division Multiple Access (FDMA) systems, time Division Multiple Access (TDMA) systems, orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, multiple carrier frequency division multiple access (MC-FDMA) systems, and so forth. CDMA may be implemented by a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA 2000. TDMA may be implemented by radio technologies such as global system for mobile communications (GSM), general Packet Radio Service (GPRS), enhanced data rates for GSM evolution (EDGE) (i.e., GERAN), and the like. OFDMA may be embodied by radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and the like. UTRA is part of Universal Mobile Telecommunications System (UMTS), and 3 rd generation partnership project (3 GPP) Long Term Evolution (LTE) is part of E-UMTS using E-UTRA. 3GPP LTE employs OFDMA on the Downlink (DL) and SC-FDMA on the Uplink (UL). LTE-advanced (LTE-a) is an evolved version of 3GPP LTE.
For descriptive convenience, a description will be given under the assumption that the present disclosure is applied to LTE and/or a New RAT (NR). However, technical features of the present disclosure are not limited thereto. For example, although the following detailed description is given based on a mobile communication system corresponding to the 3GPP LTE/NR system, the mobile communication system is applicable to any other mobile communication system except for matters specific to the 3GPP LTE/NR system.
For terms and techniques not described in detail among terms and techniques used in the present disclosure, reference may be made to 3 GPP-based standard specifications (e.g., 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.331, etc.).
In examples of the present disclosure described later, if a device "assumes" something, this may mean that the channel transmitting entity transmits the channel in compliance with the corresponding "assumption". This may also mean that the channel receiving entity receives or decodes the channel in a form conforming to the "hypothesis" in compliance with the "hypothesis" transmitting the channel.
In the present disclosure, a User Equipment (UE) may be fixed or mobile. Each of the various apparatuses that transmit and/or receive user data and/or control information through communication with a Base Station (BS) may be a UE. The term UE may be referred to as a terminal device, mobile Station (MS), mobile Terminal (MT), user Terminal (UT), subscriber Station (SS), wireless device, personal Digital Assistant (PDA), wireless modem, handheld device, etc. In the present disclosure, a BS refers to a fixed station that communicates with a UE and/or another BS and exchanges data and control information with the UE and the other BS. The term BS may be referred to as an Advanced Base Station (ABS), a Node B (NB), an evolved node B (eNB), a Base Transceiver System (BTS), an Access Point (AP), a Processing Server (PS), etc. Specifically, the BS of the Universal Terrestrial Radio Access (UTRAN) is referred to as NB, the BS of the evolved UTRAN (E-UTRAN) is referred to as eNB, and the BS of the new radio access technology network is referred to as gNB. Hereinafter, for convenience of description, regardless of the type or version of the communication technology, NB, eNB or gNB will be referred to as BS.
In the present disclosure, a node refers to a fixed point capable of transmitting/receiving radio signals to/from a UE by communicating with the UE. Regardless of its name, various types of BSs may act as nodes. For example, BS, NB, eNB, a pico cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, etc. may be a node. In addition, the node may not be a BS. For example, a Radio Remote Head (RRH) or a Radio Remote Unit (RRU) may be a node. Typically, the RRHs and RRUs have a lower power level than the BS. Since the RRH or RRU (hereinafter, RRH/RRU) is generally connected to the BS through a dedicated line such as an optical cable, the cooperative communication according to the RRH/RRU and the BS can be smoothly performed as compared with the cooperative communication according to the BS connected through a wireless link. At least one antenna is mounted per node. Antennas may refer to physical antenna ports or to virtual antennas or groups of antennas. Nodes may also be referred to as points.
In this disclosure, a cell refers to a particular geographic area in which one or more nodes provide communication services. Thus, in the present disclosure, communication with a particular cell may mean communication with a BS or node that provides communication services to the particular cell. The DL/UL signal of a specific cell refers to DL/UL signals from/to a BS or node providing communication service for the specific cell. The cell providing UL/DL communication services to the UE is specifically referred to as a serving cell. In addition, the channel state/quality of a specific cell refers to the channel state/quality of a channel or communication link generated between a BS or node providing a communication service to the specific cell and a UE. In a 3 GPP-based communication system, a UE may measure DL channel state from a particular node using cell-specific reference signal (CRS) transmitted on CRS resources and/or channel state information reference signal (CSI-RS) transmitted on CSI-RS resources allocated to the particular node by an antenna port of the particular node.
The 3 GPP-based communication system uses the concept of cells in order to manage radio resources and to distinguish cells related to radio resources from cells of a geographical area.
A "cell" of a geographical area may be understood as a coverage area where a node may use a carrier to provide a service, and a "cell" of radio resources is associated with a Bandwidth (BW) which is a frequency range configured by the carrier. Since DL coverage (the range over which a node can transmit a valid signal) and UL coverage (the range over which a node can receive a valid signal from a UE) depend on the carrier on which the signal is carried, the coverage of a node can also be associated with the coverage of a "cell" of the radio resource used by that node. Thus, the term "cell" may be used to indicate sometimes the service coverage of a node, to indicate radio resources at other times, or to indicate at other times the range reached by a signal using radio resources with an effective strength.
In the 3GPP communication standard, the concept of cells is used in order to manage radio resources. A "cell" associated with radio resources is defined by a combination of DL resources and UL resources, i.e., a combination of DL Component Carriers (CCs) and UL CCs. A cell may be configured by DL resources only or by a combination of DL and UL resources. If carrier aggregation is supported, a link between a carrier frequency of a DL resource (or DL CC) and a carrier frequency of a UL resource (or UL CC) may be indicated by system information. For example, the combination of DL resources and UL resources may be indicated by a system information block type 2 (SIB 2) linkage. In this case, the carrier frequency may be equal to or different from the center frequency of each cell or CC. When Carrier Aggregation (CA) is configured, the UE has only one Radio Resource Control (RRC) connection with the network. During RRC connection setup/re-establishment/handover, one serving cell provides non-access stratum (NAS) mobility information. During RRC connection re-establishment/handover, one serving cell provides security input. This cell is called a primary cell (Pcell). A Pcell refers to a cell operating on a primary frequency where a UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. Depending on the UE capability, the secondary cell (Scell) may be configured to form a set of serving cells with the Pcell. Scell may be configured after RRC connection establishment is complete and used to provide additional radio resources in addition to resources of a specific cell (SpCell). The carrier corresponding to the Pcell on DL is called a downlink primary CC (DL PCC), and the carrier corresponding to the Pcell on UL is called an uplink primary CC (DL PCC). The carrier corresponding to Scell on DL is referred to as downlink secondary CC (DL SCC), and the carrier corresponding to Scell on UL is referred to as uplink secondary CC (UL SCC).
For Dual Connectivity (DC) operation, the term SpCell refers to either a Pcell of a Master Cell Group (MCG) or a Pcell of a Secondary Cell Group (SCG). SpCell supports PUCCH transmission and contention-based random access and is always enabled. The MCG is a set of serving cells associated with a master node (e.g., BS) and includes a SpCell (Pcell) and optionally one or more scells. For a UE configured with DC, the SCG is a subset of serving cells associated with the secondary node and includes PSCell and 0 or more scells. PSCell is the primary Scell of SCG. For UEs in rrc_connected state that are not configured with CA or DC, there is only one serving cell including only Pcell. For a UE in rrc_connected state, configured with CA or DC, the term serving cell refers to the set of cells including SpCell and all scells. In DC, two Medium Access Control (MAC) entities are configured for the UE, i.e., one MAC entity for the MCG and one MAC entity for the SCG.
For a UE configured with CA and not configured with DC, a PCell PUCCH group including PCell and 0 or more scells and an SCell PUCCH group including only scells may be configured. For the SCell, an SCell (hereinafter, PUCCH cell) on which a PUCCH associated with a corresponding cell is transmitted may be configured. The SCell indicating the PUCCH SCell belongs to the SCell PUCCH group and PUCCH transmission of related Uplink Control Information (UCI) is performed on the PUCCH SCell.
In a wireless communication system, a UE receives information from a BS on DL and the UE transmits information to the BS on UL. The information transmitted and/or received by the BS and the UE includes data and various control information, and there are various physical channels according to the type/purpose of the information transmitted and/or received by the UE and the BS.
The 3 GPP-based communication standard defines DL physical channels corresponding to resource elements carrying information originating from higher layers and DL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, a Physical Downlink Shared Channel (PDSCH), a Physical Broadcast Channel (PBCH), a Physical Multicast Channel (PMCH), a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and the like are defined as DL physical channels, and a Reference Signal (RS) and a Synchronization Signal (SS) are defined as DL physical signals. The RS (also called pilot) represents a signal with a predefined special waveform known to both BS and UE. For example, demodulation reference signals (DMRS), channel state information RS (CSI-RS), and the like are defined as DL RS. The 3 GPP-based communication standard defines UL physical channels corresponding to resource elements carrying information originating from higher layers and UL physical signals corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. For example, a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), and a Physical Random Access Channel (PRACH) are defined as UL physical channels, and DMRS for UL control/data signals, sounding Reference Signals (SRS) for UL channel measurement, and the like are defined.
In this disclosure, PDCCH refers to a set of time-frequency resources (e.g., resource Elements (REs)) that carry Downlink Control Information (DCI), and PDSCH refers to a set of time-frequency resources that carry DL data. PUCCH, PUSCH and PRACH refer to a set of time-frequency resources carrying UCI, a set of time-frequency resources carrying UL data, and a set of time-frequency resources carrying a random access signal, respectively. In the following description, "UE transmits/receives PUCCH/PUSCH/PRACH" is used as the same meaning that the UE transmits/receives UCI/UL data/random access signal on or through PUCCH/PUSCH/PRACH, respectively. In addition, "BS transmits/receives PBCH/PDCCH/PDSCH" is used as the same meaning that the BS transmits broadcast information/DCI/DL data on or through PBCH/PDCCH/PDSCH, respectively.
In the present disclosure, radio resources (e.g., time-frequency resources) scheduled or configured by a BS for a UE to transmit or receive PUCCH/PUSCH/PDSCH may be referred to as PUCCH/PUSCH/PDSCH resources.
Since the communication device receives a Synchronization Signal Block (SSB), DMRS, CSI-RS, PBCH, PDCCH, PDSCH, PUSCH, and/or PUCCH in the form of a radio signal on a cell, the communication device may not select and receive a radio signal including only a specific physical channel or a specific physical signal through a Radio Frequency (RF) receiver or may not select and receive a radio signal without a specific physical channel or a specific physical signal through an RF receiver. In practice, the communication device receives radio signals on a cell via an RF receiver, converts the radio signals as RF band signals to baseband signals, and then decodes physical signals and/or physical channels in the baseband signals using one or more processors. Thus, in some implementations of the present disclosure, receiving a physical signal and/or physical channel may mean that the communication device does not attempt to recover the physical signal and/or physical channel from the radio signal, e.g., does not attempt to decode the physical signal and/or physical channel, but that the non-communication device does not actually receive the radio signal including the corresponding physical signal and/or physical channel.
As more and more communication devices require greater communication capacity, eMBB communication with respect to the conventional Radio Access Technology (RAT) is required. In addition, large-scale MTC, which provides various services anytime and anywhere by connecting a plurality of devices and objects to each other, is one of the main problems to be considered in next-generation communication. In addition, communication system designs that consider reliability and delay sensitive services/UEs are also being discussed. Considering eMBB communication, large-scale MTC, ultra-reliable low latency communication (URLLC), etc., the introduction of next generation RATs is being discussed. Currently, in 3GPP, research on the next generation mobile communication system after EPC is underway. In the present disclosure, for convenience, the corresponding technology is referred to as a New RAT (NR) or a fifth generation (5G) RAT, and a system using NR or supporting NR is referred to as an NR system.
Fig. 1 shows an example of a communication system 1 to which an implementation of the present disclosure is applied. Referring to fig. 1, a communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, a wireless device means a device that performs communication using a RAT (e.g., 5G NR or LTE (e.g., E-UTRA)) and may be referred to as a communication/radio/5G device. Wireless devices may include, but are not limited to, robots 100a, vehicles 100b-1 and 100b-2, augmented reality (XR) devices 100c, handheld devices 100d, home appliances 100e, internet of things (IoT) devices 100f, and Artificial Intelligence (AI) devices/servers 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., an unmanned aerial vehicle). XR devices may include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, and may be implemented in the form of head-mounted devices (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, and the like. The handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may also be implemented as wireless devices, and a particular wireless device may operate as a BS/network node with respect to another wireless device.
The wireless devices 100a to 100f may connect to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communications (e.g., vehicle-to-vehicle (V2V)/vehicle-to-anything (V2X) communications). The IoT devices (e.g., sensors) may perform direct communications with other IoT devices (e.g., sensors) or other wireless devices 100 a-100 f.
Wireless communication/connections 150a and 150b may be established between wireless devices 100 a-100 f and BS200, as well as between wireless devices 100 a-100 f. Here, wireless communications/connections such as UL/DL communications 150a and side link communications 150b (or device-to-device (D2D) communications) may be established over various RATs (e.g., 5G NR). The wireless device and BS/wireless device may transmit/receive radio signals to/from each other through wireless communication/connections 150a and 150b. To this end, at least a part of various configuration information configuration procedures for transmitting/receiving radio signals, various signal processing procedures (e.g., channel coding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocation procedures may be performed based on various proposals of the present disclosure.
Fig. 2 is a block diagram illustrating an example of a communication device capable of performing a method according to the present disclosure. Referring to fig. 2, the first wireless device 100 and the second wireless device 200 may transmit and/or receive radio signals through various RATs (e.g., LTE and NR). Here, { first wireless device 100 and second wireless device 200} may correspond to { wireless device 100x and BS200} and/or { wireless device 100x and wireless device 100x } of fig. 1.
The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and/or one or more antennas 108. The processor 102 may control the memory 104 and/or the transceiver 106 and may be configured to implement the functions, processes and/or methods described/suggested below. For example, the processor 102 may process the information within the memory 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver 106. The processor 102 may receive a radio signal including the second information/signal through the transceiver 106 and then store information obtained by processing the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may execute some or all of the processes controlled by the processor 102 or store software code including commands for performing the processes and/or methods described/suggested below. Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be coupled to the processor 102 and transmit and/or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a Radio Frequency (RF) unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.
The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and/or one or more antennas 208. The processor 202 may control the memory 204 and/or the transceiver 206 and may be configured to implement the functions, processes and/or methods described/suggested below. For example, the processor 202 may process the information within the memory 204 to generate a third information/signal and then transmit a radio signal including the third information/signal through the transceiver 206. The processor 202 may receive a radio signal including the fourth information/signal through the transceiver 206 and then store information obtained by processing the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may execute some or all of the processes controlled by the processor 202 or store software code including commands for executing the processes and/or methods described/presented below. Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and/or receive radio signals through one or more antennas 208. Each transceiver 206 can include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with RF unit. In this disclosure, a wireless device may represent a communication modem/circuit/chip.
Wireless communication techniques implemented in wireless devices 100 and 200 of the present disclosure may include narrowband internet of things for low power communications as well as LTE, NR, and 6G communications. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented by, but is not limited to, standards such as LTE Cat NB1 and/or LTE Cat NB 2. Additionally or alternatively, wireless communication techniques implemented in wireless devices XXX and YYY of the present disclosure may perform communication based on LTE-M techniques. For example, LTE-M technology may be an example of LPWAN technology, and may be referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by (but is not limited to) at least one of a variety of standards, such as: 1) LTE CAT 0, 2) LTE CAT M1, 3) LTE CAT M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine-type communications, and/or 7) LTE M. Additionally or alternatively, in view of low power communications, the wireless communication techniques implemented in wireless devices XXX and YYY of the present disclosure may include, but are not limited to, at least one of ZigBee, bluetooth, and Low Power Wide Area Network (LPWAN). For example, zigBee technology can create Personal Area Networks (PANs) related to small/low power digital communication based on various standards such as IEEE 802.15.4, and can be referred to by various names.
Hereinafter, hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as a Physical (PHY) layer, a Medium Access Control (MAC) layer, a Radio Link Control (RLC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Resource Control (RRC) layer, and a Service Data Adaptation Protocol (SDAP) layer). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure. One or more processors 102 and 202 may generate messages, control information, data, or information in accordance with the functions, processes, proposals, and/or methods disclosed in the present disclosure. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure, and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and/or methods disclosed in the present disclosure.
One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the processors 102 and 202 may be implemented in hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The functions, processes, proposals and/or methods disclosed in the present disclosure may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes or functions. Firmware or software configured to perform the functions, processes, proposals and/or methods disclosed in the present disclosure may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 to be driven by the one or more processors 102 and 202. The functions, procedures, proposals and/or methods disclosed in the present disclosure may be implemented in the form of codes, commands and/or command sets using firmware or software.
One or more memories 104 and 204 may be coupled to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, commands, and/or instructions. One or more of the memories 104 and 204 may be configured by read-only memory (ROM), random-access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, a hard drive, registers, a cache memory, a computer-readable storage medium, and/or combinations thereof. The one or more memories 104 and 204 may be located internal and/or external to the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 by various techniques, such as a wired or wireless connection.
One or more transceivers 106 and 206 may transmit the user data, control information, and/or radio signals/channels referred to in the methods and/or operational flow diagrams of the present disclosure to one or more other devices. One or more transceivers 106 and 206 may receive the user data, control information, and/or radio signals/channels mentioned in the functions, processes, proposals, methods, and/or operational flowcharts disclosed in the present disclosure from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control such that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208. The one or more transceivers 106 and 206 may be configured to transmit and receive the user data, control information, and/or radio signals/channels referred to in the functions, processes, proposals, methods, and/or operational flowcharts disclosed in the present disclosure through the one or more antennas 108 and 208. In the present disclosure, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels, etc., from RF band signals to baseband signals for processing received user data, control information, radio signals/channels, etc., using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc., processed using the one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.
Fig. 3 illustrates another example of a wireless device capable of performing implementations of the present disclosure. Referring to fig. 3, wireless devices 100 and 200 may correspond to wireless devices 100 and 200 of fig. 2 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of fig. 2. For example, transceiver 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of fig. 2. The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on programs/codes/commands/information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless/wired interface.
The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit/battery, an input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented as, but is not limited to, a robot (100 a of fig. 1), a vehicle (100 b-1 and 100b-2 of fig. 1), an XR device (100 c of fig. 1), a handheld device (100 d of fig. 1), a home appliance (100 e of fig. 1), an IoT device (100 f of fig. 1), a digital broadcast UE, a holographic device, a public safety device, an MTC device, a medical device, a financial technology device (or a financial device), a security device, a climate/environment device, an AI server/device (400 of fig. 1), a BS (200 of fig. 1), a network node, and the like. Wireless devices may be used in mobile or stationary locations depending on the use/service.
In fig. 3, the various elements, components, units/portions and/or modules in wireless devices 100 and 200 may all be connected to each other through wired interfaces, or at least a portion thereof may be connected wirelessly through communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. The various elements, components, units/portions and/or modules within wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 130 may be configured by Random Access Memory (RAM), dynamic RAM (DRAM), read Only Memory (ROM)), flash memory, volatile memory, non-volatile memory, and/or combinations thereof.
In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations in accordance with some embodiments or implementations of the present disclosure.
In the present disclosure, a computer-readable (non-transitory) storage medium may store at least one instruction or program, and the at least one instruction or program, when executed by at least one processor, may cause the at least one processor to perform operations according to some embodiments or implementations of the present disclosure.
In the present disclosure, a processing apparatus or device may include at least one processor and at least one computer memory operatively connected to the at least one processor. The at least one computer memory may store instructions or programs that, when executed, may cause at least one processor operatively connected to the at least one memory to perform operations in accordance with some embodiments or implementations of the present disclosure.
In the present disclosure, a computer program may include program code stored on at least one computer-readable (non-volatile) storage medium and which, when executed, is configured to perform operations in accordance with or cause at least one processor to perform operations in accordance with some implementations of the present disclosure. The computer program may be provided in the form of a computer program product. The computer program product may include at least one computer-readable (non-volatile) storage medium.
The communication device of the present disclosure includes: at least one processor; and at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to examples of the disclosure described later.
Fig. 4 shows an example of a frame structure used in a 3 GPP-based wireless communication system.
The frame structure of fig. 4 is merely exemplary, and the number of subframes, the number of slots, and the number of symbols in a frame may be variously changed. In an NR system, different sets of OFDM parameters (e.g., subcarrier spacing (SCS)) may be configured for a plurality of cells aggregated for one UE. Thus, the (absolute time) duration of a time resource comprising the same number of symbols (e.g. subframes, slots or Transmission Time Intervals (TTIs)) may be configured differently for the aggregated cells. Here, the symbols may include OFDM symbols (or cyclic prefix-OFDM (CP-OFDM) symbols) and SC-FDMA symbols (or discrete fourier transform-spread-OFDM (DFT-s-OFDM) symbols). In this disclosure, symbols, OFDM-based symbols, OFDM symbols, CP-OFDM symbols, and DFT-s-OFDM symbols are used interchangeably.
Referring to fig. 4, in the NR system, UL transmission and DL transmission are organized into frames. Each frame has T f ＝(△f max *N f /100)*T c Time duration=10 ms and is divided into two half frames of 5ms each. The basic unit of time for NR is T c ＝1/(△f max *N f ) Wherein Δf max ＝480*10 3 Hz and N f =4096. For reference, the basic time unit of LTE is T s ＝1/(△f ref *N f，ref ) Wherein Δf ref ＝15*10 3 Hz and N f，ref ＝2048。T c And T f With a constant k=t c /T f A relation of=64. Each half frame includes 5 subframes, and the duration T of a single subframe sf 1ms. The subframe is further divided into slots, and the number of slots in the subframe depends on the subcarrier spacing. Each slot includes 14 or 12 OFDM symbols based on a cyclic prefix. In the normal CP, each slot includes 14 OFDM symbols, and in the extended CP, each slot includes 12 OFDM symbols. The parameter set depends on the exponentially scalable subcarrier spacing Δf=2 u *15kHz. The following table shows the number of OFDM symbols per slot (N slot symb ) Every frameIs not equal to (N) frame，u slot ) And the number of slots per subframe (N subframe，u slot )。
TABLE 1
| u | N slot symb | N frame，u slot | N subframe，u slot |
| 0 | 14 | 10 | 1 |
| 1 | 14 | 20 | 2 |
| 2 | 14 | 40 | 4 |
| 3 | 14 | 80 | 8 |
| 4 | 14 | 160 | 16 |
The following table shows the subcarrier spacing Δf=2 u *15kHz, the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe.
TABLE 2
| u | N slot symb | N frame，u slot | N subframe，u slot |
| 2 | 12 | 40 | 4 |
For subcarrier spacing configuration u, the slots may be indexed in ascending order within a subframe as follows: n is n u s ∈{0，...，n subframe ，u s1ot -1}, and indexed in ascending order within the frame as follows: n is n u s，f ∈{0，...，n frame，u slot -1}。
Fig. 5 shows a resource grid of time slots. A slot includes a plurality of (e.g., 14 or 12) symbols in the time domain. For each parameter set (e.g., subcarrier spacing) and carrier, the data is transmitted from the higher layer signaling (e.g.,common Resource Block (CRB) N indicated by RRC signaling start，u grid Start defining N size，u grid，x *N RB sc Sub-carriers and N subframe，u symb Resource grid of OFDM symbols, where N size，u grid，x Is the number of Resource Blocks (RBs) in the resource grid and the subscript x is DL for downlink and UL for uplink. N (N) RB sc Is the number of subcarriers per RB. In a 3GPP based wireless communication system, N RB sc Typically 12. For a given antenna port p, subcarrier spacing configuration u and transmission link (DL or UL), there is one resource grid. The carrier bandwidth N of the subcarrier spacing configuration u is given to the UE by higher layer parameters (e.g., RRC parameters) size，u grid . Each element in the resource grid for the antenna port p and the subcarrier spacing configuration u is referred to as a Resource Element (RE), and one complex symbol may be mapped to each RE. Each RE in the resource grid is uniquely identified by an index k in the frequency domain and an index l representing a symbol position relative to a reference point in the time domain. In the NR system, RBs are defined by 12 consecutive subcarriers in the frequency domain. In the NR system, RBs are classified into CRBs and Physical Resource Blocks (PRBs). For subcarrier spacing configuration u, the CRB is numbered from 0 upward in the frequency domain. The center of subcarrier 0 of CRB 0 of subcarrier spacing configuration u is equal to "point a" serving as a common reference point of the RB grid. PRBs for subcarrier spacing configuration u are defined in a bandwidth part (BWP) and range from 0 to N size，u BWP，i -1 number, where i is the number of BWP. PRB n in BWP i PRB And CRB n u CRB The relation between is represented by n u PRB ＝n u CRB +N size，u BWP，i Given, where N size BWP，i Is the CRB where BWP starts with respect to CRB 0. BWP comprises a plurality of consecutive RBs in the frequency domain. For example, BWP may be a given parameter set u in BWP i on a given carrier i A subset of defined contiguous CRBs. The carrier may include a maximum of N (e.g., 5) BWPs. The UE may be configured with one or more BWPs on a given component carrier. Performing a number of operations by enabled BWPA predetermined number of BWP (e.g., one BWP) among BWP configured for the UE according to communication and on the component carrier may be active.
For each serving cell in the set of DL BWP or UL BWP, the network may configure at least the initial DL BWP and one (if the serving cell is configured with an uplink) or two (if a supplemental uplink is used) initial UL BWP. The network may configure additional UL and DL BWP. For each DL BWP or UL BWP, the following parameters may be provided to the UE for the serving cell: i) SCS (SCS); ii) CP; iii) From at N start BWP Supposition of =275 indicates offset RB set And length L RB CRB N provided as RRC parameter locationBandWidth of Resource Indicator Value (RIV) start BWP ＝O carrier +RB start And the number N of contiguous RBs size BWP ＝L RB And a value O provided by RRC parameter offsettopcarrier for SCS carrier The method comprises the steps of carrying out a first treatment on the surface of the Index in the set of DL BWP or UL BWP; a set of BWP common parameters; and a set of BWP-specific parameters.
Virtual Resource Blocks (VRBs) may be defined within BWP and from 0 to N size，u BWP，i -1 index, wherein i denotes BWP number. VRBs may be mapped to PRBs according to a non-interleaved mapping. In some implementations, for non-interleaved VRB-to-PRB mapping, VRB n may be mapped to PRB n.
A UE configured with carrier aggregation may be configured to use one or more cells. If the UE is configured with multiple serving cells, the UE may be configured with one or more cell groups. The UE may also be configured with multiple cell groups associated with different BSs. Alternatively, the UE may be configured with multiple cell groups associated with a single BS. Each cell group of the UE includes one or more serving cells and includes a single PUCCH cell configuring PUCCH resources. The PUCCH cell may be Scell configured as a PUCCH cell among Pcell or scells of corresponding cell groups. Each serving cell of the UE belongs to one of the cell groups of the UE and does not belong to multiple cells.
Fig. 6 shows a slot structure used in a 3GPP based system. In all 3GPP based systems (e.g. in NR systems), each slot may have a self-contained structure comprising i) DL control channels, ii) DL or UL data and/or iii) UL control channels. For example, the first N symbols in a slot may be used to transmit DL control channels (hereinafter DL control region), and the last M symbols in a slot may be used to transmit UL control channels (hereinafter UL control region), where N and M are integers other than negative numbers. A resource region (hereinafter, a data region) between the DL control region and the UL control region may be used to transmit DL data or UL data. Symbols in a single slot may be divided into consecutive symbol groups that may be used as DL symbols, UL symbols, or flexible symbols. Hereinafter, information indicating how each symbol in a slot is used will be referred to as a slot format. For example, the slot format may define which symbols in the slot are for UL and which symbols in the slot are for DL.
When the BS intends to operate a serving cell in a Time Division Duplex (TDD) mode, the BS may configure UL and DL allocation patterns for the serving cell through higher layer (e.g., RRC) signaling. For example, the following parameters may be used to configure a TDD DL-UL pattern:
-DL-UL-TransmissionPeriodicity providing periodicity of DL-UL pattern;
nrofDownlinkSlots, which provide the number of consecutive full DL slots at the beginning of each DL-UL pattern, where full DL slots are slots with DL symbols only;
nrofDownlinkSymbols, which provide the number of consecutive DL symbols at the beginning of the slot immediately after the last full DL slot;
nrofUplinkSlots, which provides the number of consecutive full UL slots at the end of each DL-UL pattern, where a full UL slot is a slot with UL symbols only; and
nrofUplinkSymbols, which provide the number of consecutive UL symbols at the end of the slot immediately preceding the first full UL slot.
The remaining symbols, which are not configured as DL symbols or UL symbols, among the symbols in the DL-UL pattern are flexible symbols.
If the configuration of the TDD DL-UL pattern, i.e., TDD UL-DL configuration (e.g., TDD-UL-DL-configuration command or TDD-UL-DL-configuration defined) is provided to the UE through higher layer signaling, the UE sets a slot format per slot on a plurality of slots based on the configuration.
For the symbols, although various combinations of DL symbols, UL symbols, and flexible symbols may exist, a predetermined number of combinations may be predefined as slot formats, and the predefined slot formats may be respectively identified by slot format indexes. The following table shows a part of the predefined slot format. In the following table, D represents DL symbols, U represents UL symbols, and F represents flexible symbols.
TABLE 3
To indicate which slot format is used in a specific slot among the predefined slot formats, the BS may configure a set of slot format combinations suitable for the corresponding serving cell per cell for the serving cell set through higher layer (e.g., RRC) signaling, and cause the UE to monitor a group common PDCCH of a Slot Format Indicator (SFI) through higher layer (e.g., RRC) signaling. Hereinafter, DCI carried by a group common PDCCH for SFI will be referred to as SFIDCI. DCI format 2_0 is used as SFIDCI. For example, for each serving cell in the set of serving cells, the BS may provide to the UE the (start) position of the slot format combination ID (i.e., SFI index) of the corresponding serving cell in the SFIDCI, the set of slot format combinations applicable to the serving cell, and the reference subcarrier spacing configuration for each of the slot formats in the slot format combinations indicated by the SFI index value in the SFIDCI. One or more slot formats are configured for each slot format combination in the set of slot format combinations and a slot format combination ID (i.e., SFI index) is assigned to the slot format combination. For example, when the BS intends to configure a slot format combination having N slot formats, N slot format indexes among slot format indexes of a predefined slot format (for example, see table 3) may be indicated for the slot format combination. To configure a group common PDCCH in which a UE monitors an SFI, a BS informs the UE of an SFI-RNTI corresponding to a Radio Network Temporary Identifier (RNTI) for the SFI and a total length of a DCI payload scrambled with the SFI-RNTI. Upon detecting the PDCCH based on the SFI-RNTI, the UE may determine a slot format of a corresponding serving cell from the SFI index of the serving cell among the SFI indexes in the DCI payload in the PDCCH.
The symbols indicated as flexible symbols by the TDD DL-UL pattern configuration may be indicated as UL symbols, DL symbols, or flexible symbols by SFIDCI. Symbols indicated as DL/UL symbols by TDD DL-UL pattern configuration are not overwritten as UL/DL symbols or flexible symbols by SFIDCI.
If the TDD DL-UL pattern is not configured, the UE determines whether each slot is used for UL or DL and determines symbol allocation in each slot based on SFIDCI and/or DCI (e.g., DCI format 1_0, DCI format 1_1, DCI format 1_2, DCI format 0_0, DCI format 0_1, DCI format 0_2, and DCI format 2_3) for scheduling or triggering DL or UL signal transmission.
The NR frequency band is defined as two types of frequency ranges, FR1 and FR2.FR2 is also known as millimeter wave (mmW). The following table shows the frequency range over which NR can operate.
TABLE 4
| Frequency range assignment | Corresponding frequency range | Subcarrier spacing |
| FR1 | 410MHz-7125MHz | 15、30、60kHz |
| FR2 | 24250MHz-52600MHz | 60、120、240kHz |
Hereinafter, physical channels usable in the 3 GPP-based wireless communication system will be described in detail.
The PDCCH carries DCI. For example, the PDCCH (i.e., DCI) carries information on a transport format and resource allocation of a downlink shared channel (DL-SCH), information on resource allocation of an uplink shared channel (UL-SCH), paging information on a Paging Channel (PCH), system information on the DL-SCH, information on resource allocation of a control message (e.g., a Random Access Response (RAR) transmitted on a PDSCH) of a higher layer (hereinafter, higher layer) among protocol stacks of the UE/BS than a physical layer, transmission power control command, information on activation/deactivation of a Configuration Scheduling (CS), and the like. The DCI including information on resource allocation of the DL-SCH is referred to as PDSCH scheduling DCI, and the DCI including information on resource allocation of the UL-SCH is referred to as PUSCH scheduling DCI. The DCI includes a Cyclic Redundancy Check (CRC). The CRC is masked/scrambled with various identifiers, e.g., a Radio Network Temporary Identifier (RNTI), according to the owner and purpose of the PDCCH. For example, if the PDCCH is for a particular UE, the CRS is masked with a UE identifier (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH is used for system information (e.g., a System Information Block (SIB)), the CRC is masked with a system information RNTI (SI-RNTI). If the PDCCH is used for a random access response, the CRC is masked with a random access-RNTI (RA-RNTI).
When a PDCCH on one serving cell schedules a PDSCH or PUSCH on another serving cell, it is referred to as cross-carrier scheduling. Cross-carrier scheduling with Carrier Indicator Field (CIF) may allow PDCCH on a serving cell to schedule resources on another serving cell. When PDSCH on a serving cell schedules PDSCH or PUSCH on the serving cell, it is referred to as self-carrier scheduling. When cross-carrier scheduling is used in a cell, the BS may provide information about the cell of the scheduling cell to the UE. For example, the BS may inform the UE whether the serving cell is scheduled by a PDCCH on another (scheduling) cell or by the serving cell. If the serving cell is scheduled by another (scheduling) cell, the BS may signal to the UE which cell signals DL assignment and UL grant of the serving cell. In the present disclosure, a cell carrying a PDCCH is referred to as a scheduling cell, and a cell in which transmission of a PUSCH or PDSCH is scheduled by DCI included in the PDCCH (i.e., a cell carrying a PUSCH or PDSCH scheduled by the PDCCH) is referred to as a scheduled cell.
PDSCH is a physical layer UL channel for UL data transmission. PDSCH carries DL data (e.g., DL-SCH transport blocks) and is subject to modulation such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64QAM, 256QAM, etc. The codeword is generated by encoding a Transport Block (TB). PDSCH may carry a maximum of two codewords. Scrambling and modulation mapping per codeword may be performed and modulation symbols generated from the respective codewords may be mapped to one or more layers. The respective layers are mapped to radio resources together with DMRS and generated as OFDM symbol signals. Then, the OFDM symbol signal is transmitted through the corresponding antenna port.
The PUCCH means a physical layer UL channel for Uplink Control Information (UCI) transmission. The PUCCH carries UCI. The UCI type transmitted on the PUCCH may include hybrid automatic repeat request acknowledgement (HARQ-ACK) information, scheduling Request (SR), and Channel State Information (CSI). UCI bits may include HARQ-ACK information bits, if any, SR information bits, if any, link Recovery Request (LRR) information bits, if any, and CSI bits, if any. In the present disclosure, the HARQ-ACK information bits may correspond to a HARQ-ACK codebook. In particular, a bit sequence in which HARQ-ACK information bits are arranged according to a predetermined rule is called a HARQ-ACK codebook.
-a Scheduling Request (SR): information for requesting UL-SCH resources.
-hybrid automatic repeat request (HARQ) -Acknowledgement (ACK): response to DL data packets (e.g., codewords) on PDSCH. The HARQ-ACK indicates whether the communication device successfully received the DL data packet. In response to a single codeword, a 1-bit HARQ-ACK may be transmitted. In response to the two codewords, a 2-bit HARQ-ACK may be transmitted. The HARQ-ACK response includes a positive ACK (abbreviated ACK), a Negative ACK (NACK), discontinuous Transmission (DTX), or NACK/DTX. Here, the term HARQ-ACK may be used interchangeably with HARQ ACK/NACK, or a/N.
-Channel State Information (CSI): feedback information about DL channels. The CSI may include Channel Quality Information (CQI), a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), a CSI-RS resource indicator (CSI), an SS/PBCH resource block indicator (SSBRI), and a layer indicator (L1). CSI may be classified into CSI part 1 and CSI part 2 according to UCI types included in CSI. For example, CRI, RI, and/or CQI of the first codeword may be included in CSI part 1, and LI, PMI, and/or CQI of the second codeword may be included in CSI part 2.
-Link Recovery Request (LRR):
in the present disclosure, PUCCH resources configured/indicated by the BS for/to the UE for HARQ-ACK, SR, and CSI transmission are referred to as HARQ-ACK PUCCH resources, SR PUCCH resources, and CSI PUCCH resources, respectively, for convenience.
The PUCCH format may be defined as follows according to UCI payload size and/or transmission length (e.g., the number of symbols included in the PUCCH resource). For PUCCH formats, reference may also be made to table 5.
(0) PUCCH format 0 (PF 0 or F0)
Supported UCI payload size: up to K bits (e.g., k=2)
-number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., x=2)
-a transmission structure: only UCI signals are included in PUCCH format 0 without DMRS. The UE transmits UCI status by selecting and transmitting one of a plurality of sequences. For example, the UE transmits a specific UCI to the BS by transmitting one of a plurality of sequences through PUCCH (PUCCH format 0). The UE transmits PUCCH (PUCCH format 0) in PUCCH resources for a corresponding SR configuration only when transmitting a positive SR.
The configuration of PUCCH format 0 includes the following parameters for the corresponding PUCCH resource: an index of the initial cyclic shift, a number of symbols for PUCCH transmission, and/or a first symbol for PUCCH transmission.
(1) PUCCH format 1 (PF 1 or F1)
Supported UCI payload size: up to K bits (e.g., k=2)
-number of OFDM symbols constituting a single PUCCH: y to Z symbols (e.g., y=4 and z=14)
-a transmission structure: DMRS and UCI are configured/mapped in TDM to different OFDM symbols. In other words, the DMRS is transmitted in a symbol in which a modulation symbol is not transmitted, and UCI is represented as a product between a specific sequence (e.g., orthogonal Cover Code (OCC)) and a modulation (e.g., QPSK) symbol. Code Division Multiplexing (CDM) is supported between multiple PUCCH resources (conforming to PUCCH format 1) (within the same RB) by applying Cyclic Shift (CS)/OCC to both UCI and DMRS. PUCCH format 1 carries UCI of at most 2 bits and spreads modulation symbols in the time domain by OCC (differently configured according to whether frequency hopping is performed).
The configuration of PUCCH format 1 includes the following parameters for the corresponding PUCCH resource: an index of an initial cyclic shift, a number of symbols for PUCCH transmission, a first symbol for PUCCH transmission, and/or an index of OCC.
(2) PUCCH format 2 (PF 2 or F2)
Supported UCI payload size: over K bits (e.g., k=2)
-number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., x=2)
-a transmission structure: DMRS and UCI are configured/mapped using Frequency Division Multiplexing (FDM) within the same symbol. The UE transmits UCI by applying IFFT to the encoded UCI bits without DFT. PUCCH format 2 carries UCI of a bit size larger than K bits, and the modulation symbols are subjected to FDM with DMRS for transmission. For example, DMRS is located in symbol indexes #1, #4, #7, and #10 within a given RB with a density of 1/3. A Pseudo Noise (PN) sequence is used for the DMRS sequence. Frequency hopping may be enabled for 2-symbol PUCCH format 2.
The configuration of PUCCH format 2 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols used for PUCCH transmission, and/or the first symbol used for PUCCH transmission.
(3) PUCCH format 3 (PF 3 or F3)
Supported UCI payload size: over K bits (e.g., k=2)
-number of OFDM symbols constituting a single PUCCH: y to Z symbols (e.g., y=4 and z=14)
-a transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols in TDM. The UE transmits UCI by applying DFT to the encoded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resource (e.g., the same PRB).
The configuration of PUCCH format 3 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols used for PUCCH transmission, and/or the first symbol used for PUCCH transmission.
(4) PUCCH format 4 (PF 4 or F4)
Supported UCI payload size: over K bits (e.g., k=2)
-number of OFDM symbols constituting a single PUCCH: y to Z symbols (e.g., y=4 and z=14)
-a transmission structure: DMRS and UCI are configured/mapped to different OFDM symbols in TDM. PUCCH format 4 may be multiplexed into up to 4 UEs in the same PRB by applying OCC at the front end of DFT and CS (or Interleaved FDM (IFDM) mapping) to DMRS. In other words, the modulation symbols of UCI undergo TDM with DMRS for transmission.
The configuration of PUCCH format 4 includes the following parameters for the corresponding PUCCH resource: the number of symbols for PUCCH transmission, the length of the OCC, the index of the OCC, and the first symbol for PUCCH transmission.
The following table shows PUCCH formats. The PUCCH formats may be divided into short PUCCH formats (formats 0 and 2) and long PUCCH formats (formats 1, 3 and 4) according to PUCCH transmission lengths.
TABLE 5
PUCCH resources may be determined according to UCI type (e.g., a/N, SR or CSI). PUCCH resources for UCI transmission may be determined based on UCI (payload) size. For example, the BS may configure a plurality of PUCCH resource sets for the UE, and the UE may select a specific PUCCH resource set corresponding to a specific range according to a range (e.g., UCI bit number) of UCI (payload) size. For example, the UE may select one of the following PUCCH resource sets according to the UCI bit number NUCI.
PUCCH resource set #0 if UCI number of bits= <2
PUCCH resource set #1 if 2< uci bit number= < N1
...
-PUCCH resource set # (K-1), if NK-2< uci bit number= < NK-1
Here, K represents the number of PUCCH resource sets (K > 1), and Ni represents the maximum UCI bit number supported by PUCCH resource set #i. For example, PUCCH resource set #1 may include resources of PUCCH formats 0 to 1, and the other PUCCH resource sets may include resources of PUCCH formats 2 to 4 (see table 6).
The configuration of each PUCCH resource includes a PUCCH resource index, a starting PRB index, and a configuration of one of PUCCH formats 0 to 4. The BS configures a code rate for multiplexing HARQ-ACK, SR and CSI report within PUCCH transmission using PUCCH format 2, PUCCH format 3 or PUCCH format 4 to the UE through higher layer parameter maxCodeRate. The higher layer parameter maxCodeRate is used to determine how to feedback UCI on PUCCH resources of PUCCH formats 2, 3 or 4.
If the UCI type is SR and CSI, PUCCH resources to be used for UCI transmission in the PUCCH resource set may be configured for the UE through higher layer signaling (e.g., RRC signaling). If the UCI type is HARQ-ACK of a semi-persistent scheduling (SPS) PDSCH, PUCCH resources in the PUCCH resource set to be used for UCI transmission may be configured for the UE through higher layer signaling (e.g., RRC signaling). On the other hand, if the UCI type is HARQ-ACK for PDSCH scheduled by DCI, PUCCH resources to be used for UCI transmission in the PUCCH resource set may be scheduled by DCI.
In the case of DCI-based PUCCH resource scheduling, the BS may transmit DCI to the UE on the PDCCH and indicate PUCCH resources to be used for UCI transmission in a specific PUCCH resource set through an ACK/NACK resource indicator (ARI) in the DCI. The ARI may be used to indicate PUCCH resources for ACK/NACK transmission and is also referred to as a PUCCH Resource Indicator (PRI). Here, DCI may be used for PDSCH scheduling and UCI may include HARQ-ACK for PDSCH. The BS may configure a PUCCH resource set including a greater number of PUCCH resources than the ARI can represent for the UE through (UE-specific) higher layer (e.g., RRC) signaling. The ARI may indicate PUCCH resource subsets of the PUCCH resource set, and which PUCCH resource of the indicated PUCCH resource subsets to use may be determined according to an implicit rule based on transmission resource information (e.g. starting CCE index of PDCCH) on the PDCCH.
For UL-SCH data transmission, the UE should include UL resources available to the UE, and for DL-SCH data reception, the UE should include DL resources available to the UE. The BS assigns UL resources and DL resources to the UE through resource allocation. The resource allocations may include Time Domain Resource Allocation (TDRA) and Frequency Domain Resource Allocation (FDRA). In this disclosure, UL resource allocation is also referred to as UL grant, and DL resource allocation is referred to as DL assignment. UL grants are received dynamically by the UE on PDCCH or in RAR, or semi-permanently configured by BS for the UE through RRC signaling. The DL assignment is received dynamically by the UE on the PDCCH or semi-permanently configured for the UE by the BS through RRC signaling.
On the UL, the BS may dynamically allocate UL resources to the UE through a PDCCH addressed to a cell radio network temporary identifier (C-RNTI). The UE monitors the PDCCH to find possible UL grants for UL transmissions. The BS may allocate UL resources to the UE using the configuration grant. Two types of configuration permissions, type 1 and type 2, may be used. In type 1, the BS directly provides the configured UL grant (including periodicity) through RRC signaling. In type 2, the BS may configure the periodicity of RRC configuration UL grants through RRC signaling, and signal, enable, or disable the configured UL grants through PDCCH addressed to the configuration scheduling RNTI (CS-RNTI). For example, in type 2, the PDCCH addressed to the CS-RNTI indicates that the corresponding UL grant may be implicitly reused according to the periodicity configured through RRC signaling until deactivated.
On DL, the BS may dynamically allocate DL resources to the UE through a PDCCH addressed to the C-RNTI. The UE monitors the PDCCH to find possible DL grants. The BS may allocate DL resources to the UE using SPS. The BS may configure the periodicity of the configured DL assignment through RRC signaling and signal, enable, or disable the configured DL assignment through PDCCH addressed to the CS-RNTI. For example, the PDCCH addressed to the CS-RNTI indicates that the corresponding DL assignment can be implicitly reused according to the periodicity configured through RRC signaling until deactivated.
Hereinafter, resource allocation through the PDCCH and resource allocation through the RRC will be described in more detail.
* Resource allocation by PDCCH: dynamic licensing/assignment
The PDCCH may be used to schedule DL transmissions on PDSCH and UL transmissions on PUSCH. The DCI on the PDCCH for scheduling DL transmissions may include a DL resource assignment including at least a modulation and coding format (e.g., modulation and Coding Scheme (MCS)) index I associated with the DL-SCH MCS ) Resource allocation and HARQ information. The DCI on the PDCCH for scheduling UL transmission may include UL scheduling grant including at least modulation and coding format, resource allocation, and HARQ information associated with the UL-SCH. The HARQ information about the DL-SCH or UL-SCH may include a new information indicator (NDI), a Transport Block Size (TBS), a Redundancy Version (RV), and a HARQ process ID (i.e., HARQ process number). The size and purpose of DCI carried by one PDCCH differ according to DCI formats. For example, DCI format 0_0, DCI format 0_1, or DCI format 0_2 may be used to schedule PUSCH, and DCI format 1_0, DCI format 1_1, or DCI format 1_2 may be used to schedule PDSCH. Specifically, DCI format 0_2 and DCI format 1_2 may be used to schedule a transmission having higher transmission reliability and lower delay requirements than the transmission reliability and delay requirements guaranteed by DCI format 0_0, DCI format 0_1, DCI format 1_0, or DCI format 1_1. Some implementations of the present disclosure may be applied to UL data transmission based on DCL format 0_2. Some implementations of the present disclosure may be applied to DL data reception based on DCI format 1_2.
Fig. 7 shows an example of PDSCH TDRA caused by PDCCH and an example of PUSCH TDRA caused by PDCCH.
The DCI carried by the PDCCH to schedule the PDSCH or PUSCH includes a TDRA field. The TDRA field provides a value m of a row index m+1 for an allocation table of PDSCH or PUSCH. The predefined default PDSCH time domain allocation is applied as an allocation table of PDSCH, or the BS is applied as an allocation table of PDSCH through PDSCH TDRA table configured by RRC signal PDSCH-timedomainalllocation list. The predefined default PUSCH time domain allocation is applied as an allocation table of PUSCH, or the BS applies as an allocation table of PUSCH through PUSCH TDRA table configured by RRC signal PUSCH-timedomainalllocation list. The PDSCH TDRA table to be applied and/or the PUSCH TDRA table to be applied may be determined according to fixed/predefined rules (e.g. with reference to 3gpp TS 38.214).
In PDSCH time domain resource allocation, individual cablesReference defines DL assignment and PDSCH slot offset K 0 The starting and length indicator values SLIV (or starting position (e.g., starting symbol index S) and allocation length (e.g., number of symbols L)) of PDSCH in a direct slot), and PDSCH mapping type. In PUSCH time domain resource configuration, each index row defines UL grant and PUSCH slot offset K 2 A starting position (e.g., starting symbol index S) and an allocation length (e.g., number of symbols L) of PUSCH in a slot, and a PUSCH mapping type. K of PDSCH 0 And PUSCH K 2 The difference between the slot with PDCCH and the slot with PDSCH or PUSCH corresponding to PDCCH is indicated. The SLIV represents a joint indicator with respect to a start symbol S of the start of a slot having the PDSCH or PUSCH and the number L of consecutive symbols counted from the symbol S. The PDSCH/PUSCH mapping type has two mapping types: map type a and map type B. In PDSCH/PUSCH mapping type a, demodulation reference signals (DMRS) are mapped to PDSCH/PUSCH resources based on the beginning of a slot. One or two symbols among symbols of PDSCH/PUSCH resources may be used as DMRS symbols according to other DMRS parameters. For example, in PDSCH/PUSCH mapping type a, the DMRS is located on the third symbol (symbol # 2) or the fourth symbol (symbol # 3) in the slot according to RRC signaling. In PDSCH/PUSCH mapping type B, DMRS is mapped based on the first OFDM symbol of PDSCH/PUSCH resources. Depending on other DMRS parameters, one or two symbols from the first symbol of PDSCH/PUSCH resources may be used as DMRS symbols. For example, in PDSCH/PUSCH mapping type B, the DMRS is located on the first symbol allocated for PDSCH/PUSCH. In the present disclosure, the PDSCH/PUSCH mapping type may be referred to as a mapping type or DMRS mapping type. For example, in the present disclosure, PUSCH mapping type a may be referred to as mapping type a or DMRS mapping type a, and PUSCH mapping type B may be referred to as mapping type B or DMRS mapping type B.
The scheduling DCI includes an FDRA field providing assignment information about RBs for a PDSCH or PUSCH. For example, the FDRA field provides information about a cell for PDSCH or PUSCH transmission to the UE, information about BWP for PDSCH or PUSCH transmission, and/or information about RBs for PDSCH or PUSCH transmission.
* Resource allocation by RRC
As described above, there are two types of transmissions without dynamic permissions: configuration license type 1 and configuration license type 2. In configuration grant type 1, UL grant is provided by RRC and stored as configuration UL grant. In configuration grant type 2, UL grants are provided by the PDCCH and stored or cleared as configuration UL grants based on L1 signaling indicating configuration UL grant enablement or disablement. Type 1 and type 2 may be configured by RRC per serving cell and per BWP. Multiple configurations may be active simultaneously on different serving cells.
When configuration grant type 1 is configured, the following parameters may be provided to the UE through RRC signaling:
-CS-RNTI corresponding to CS-RNTI for retransmission;
periodicity corresponding to the periodicity of configuration license type 1;
-timeDomainOffset indicating a resource offset in the time domain relative to a System Frame Number (SFN) =0;
-a timedomainalillocation value m providing a row index m+1 pointing to the allocation table, indicating a combination of start symbol S, length L and PUSCH mapping type;
-frequency domain allocation; and
-mcsAndTBS providing I indicating modulation order, target code rate and transport block size MCS 。
When configuration grant type 1 is configured for the serving cell through RRC, the UE stores the UL grant provided by RRC as the indicated configuration UL grant for the serving cell and initializes or reinitializes the configuration UL grant to start with a symbol according to timeDomainOffset and S (derived from SLIV) and repeat with periodicity. After configuring the UL grant for configuration grant type 1, the UE may consider the UL grant to repeat with each symbol association satisfying the following equation: [ (SFN numberOfSlotsPerFrame (numberOfSymbolsPerSlot) + (number of slots in frame x number of symbols per slot) +number of symbols in slots ] = (timeDomainOffset x number of symbols per slot+s+n x periodic) module (1024 x number of symbols per frame x number of symbols per slot), where number of symbols per frame and number of consecutive OFDM symbols per slot are indicated for all N > =0, respectively (see tables 1 and 2).
For configuration grant type 2, the bs may provide the following parameters to the UE through RRC signaling:
-CS-RNTI corresponding to CS-RNTI for enabling, disabling and retransmitting; and
Periodicity providing periodicity of configuration license type 2.
The actual UL grant is provided to the UE through PDCCH (addressed to CS-RNTI). After configuring the UL grant for configuration grant type 2, the UE may consider the UL grant to repeat with each symbol association satisfying the following equation: [ (SFN x number ofslotsperframe x number ofsymbol perslot) + (number of slots in frame x number of symbols in slot) +]＝[(SFN Start time *numberOfSlotsPerFrame*numberOfSymbolsPerSlot+slot Start time *numberOfSymbolsPerSlot+symbol Start time )+N*periodicity]Modulo (1024 x numberOfSlotsPerframe x numberOfSymbsPerslot) for all N>=0, wherein SFN Start time 、slot Start time And symbol Start time SFN, slot and symbol, respectively, representing the first transmission opportunity of PUSCH after configuration grant can be (re) initialized, number ofslotsperframe and number ofsymbolsperslot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to tables 1 and 2).
In some scenarios, the UE may be further provided by the BS with parameters HARQ-ProcID-Offset and/or parameters HARQ-ProcID-Offset2 for deriving HARQ process IDs configuring UL grants. The HARQ-ProcID-Offset is an Offset of the HARQ process configuring the grant for the shared spectrum channel access operation, and the HARQ-ProcID-Offset2 is an Offset of the HARQ process configuring the grant. In the present disclosure, cg-retransmission timer is the duration after transmission (retransmission) based on configuration grant, where the UE should not autonomously perform retransmission based on HARQ process of transmission (retransmission). Cg-retransmission timer may be provided to the UE by the BS when configuring retransmissions for configuring UL grants. For configuration grants that do not configure neither HARQ-ProcID-Offset nor cg-retransmission timer, the HARQ process ID associated with the first symbol of the UL transmission may be derived from: HARQ process id= [ floor (current_symbol/periodicity) ] module nrofHARQ-Processes. For a configured UL grant with HARQ-ProcID-Offset2, the HARQ process ID associated with the first symbol of the UL transmission may be derived from: HARQ process id= [ current_symbol/periodicity) ] modulator HARQ-process + HARQ-ProcID-Offset2, wherein current_symbol= (SFN x number of symbols in number of symbols per slot + frame), and numberOfSlotsPerFrame and numberOfSymbolsPerSlot represent the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively. For a configuration UL grant with cg-retransmission timer, the UE may select a HARQ process ID from among HARQ process IDs available for configuration grant configuration.
On DL, semi-persistent scheduling (SPS) may be provided to the UE through RRC signaling from the BS per serving cell and per BWP. For DL SPS, DL assignments are provided to the UE over PDCCH and stored or cleared based on L1 signaling indicating SPS activation or deactivation. When configuring SPS, the BS may provide the UE with the following parameters through RRC signaling (e.g., SPS configuration) for configuring semi-persistent transmission:
-CS-RNTI corresponding to CS-RNTI for enabling, disabling and retransmitting;
-nrofHARQ-Processes, providing the number of HARQ Processes for SPS;
-periodicity providing periodicity of configuration DL assignments for SPS;
n1PUCCH-AN, HARQ resources of PUCCH for SPS are provided (the network configures HARQ resources to either format 0 or format 1, and the actual PUCCH resources are configured by PUCCH-config and referenced by its ID in n1 PUCCH-AN).
Multiple DL SPS configurations may be configured within the BWP of the serving cell. After configuring DL assignments for SPS, the UE may consider that the nth DL assignment occurs in sequence in a slot satisfying the following equation: (numberOfSlotsPerFrame SFN + number of slots in frame) = [ (numberOfSlotsPerFrame SFN) Start time +slot Start time )+N*periodicity*numberOfSlotsPerFrame/10]Modulo (1024 x numberOfSlotsPerframe), where SFN Start time And slot Start time The SFN and slot, respectively, representing the first transmission of PDSCH after configuration DL assignment is (re) initialized, the numberOfSlotsPerFrame and numberOfSymbolsPerSlot indicate the number of consecutive slots per frame and the number of consecutive OFDM symbols per slot, respectively (refer to tables 1 and 2).
In some scenarios, the UE may be further provided by the BS with a parameter HARQ-ProcID-Offset for deriving the HARQ process ID configuring the DL assignment. The HARQ-ProcID-Offset is the Offset of the HARQ process of the SPS. For a configuration DL assignment without HARQ-ProcID-Offset, the HARQ process ID associated with the slot from which the DL transmission starts may be determined from: HARQ process id= [ floor (current_slot 10/(numberofslot perframe)) ] module nrofHARQ-Processes, wherein current_slot= [ (SFN x number slot perframe) +slot number in the frame ], and numberofslot perframe represents the number of consecutive slots per frame. For a configuration DL assignment with HARQ-ProcID-Offset, the HARQ process ID associated with the slot from which the DL transmission starts can be determined from: HARQ process id= [ floor (current_slot/periodicity) ] modulator HARQ-process+harq-ProcID-Offset, wherein current_slot= [ (SFN x number of slots in the frame) +number of slots in the frame ], and number of consecutive slots per frame.
If the CRC of the corresponding DCI format is scrambled with a CS-RNTI provided by an RRC parameter CS-RNTI and a new data indicator field of an enabled transport block is set to 0, the UE verifies the DL SPS assignment PDCCH or the configuration UL grant type 2PDCCH for scheduling enablement or scheduling release. If all fields of the DCI format are set according to tables 6 and 7, verification of the DCI format is achieved. Table 6 shows an example of a special field for DL SPS and UL grant type 2 scheduling enable PDCCH verification, and table 7 shows an example of a special field for DL SPS and UL grant type 2 scheduling release PDCCH verification.
TABLE 6
TABLE 7
| DCI Format 0_0 | DCI Format 1_0 | |
| HARQ process number | All set to "0" | All set to "0" |
| Redundancy version | Set to "00" | Set to "00" |
| Modulation and coding scheme | All set to "1" | All set to "1" |
| Resource block assignment | All set to "1" | All set to "1" |
The actual DL assignment and UL grant for DL SPS or UL grant type 2 and the corresponding MCS are provided by a resource assignment field (e.g., a TDRA field providing a TDRA value m, an FDRA field providing a frequency resource block assignment, and/or an MCS field) in the DCI format carried by the corresponding DL SPS or UL grant type 2 scheduling enable PDCCH. If authentication is achieved, the UE treats the information in the DCI format as a valid enablement or valid release of DL SPS or configuration UL grant type 2.
In the present disclosure, a DL SPS-based PDSCH may be referred to as an SPS PDSCH, and a UL Configuration Grant (CG) -based PUSCH may be referred to as a CG PUSCH. The PDSCH dynamically scheduled by DCI carried on PDCCH may be referred to as a Dynamic Grant (DG) PDSCH, and the PUSCH dynamically scheduled by DCI carried on PDCCH may be referred to as a DG PUSCH.
Fig. 8 illustrates a HARQ-ACK transmission/reception procedure.
Referring to fig. 8, the ue may detect a PDCCH in a slot n. Next, the UE may receive the PDSCH in the slot n+k0 according to scheduling information received through the PDCCH in the slot n and then transmit the UCI through the PUCCH in the slot n+k1. In this case, the UCI includes a HARQ-ACK response to the PDSCH.
DCI (e.g., DCI format 1_0 or DCI format 1_1) carried by a PDCCH for scheduling PDSCH may include the following information.
-FDRA: FDRA indicates the set of RBs allocated to PDSCH.
-TDRA: the TDRA indicates DL assignment and PDSCH slot offset K0, starting position (e.g., symbol index S) and length (e.g., number of symbols L) of PDSCH in the slot, and PDSCH mapping type. PDSCH mapping type a or PDSCH mapping type B may be indicated by TDRA. For PDSCH mapping type a, the DMRS is located in the third symbol (symbol # 2) or the fourth symbol (symbol # 3) in the slot. For PDSCH mapping type B, DMRS is allocated in the first symbol allocated for PDSCH.
PDSCH-to-harq_feedback timing indicator: the indicator indicates K1.
The HARQ-ACK response may consist of one bit if the PDSCH is configured to transmit at most one TB. If the PDSCH is configured to transmit a maximum of 2 TBs, the HARQ-ACK response may consist of 2 bits when spatial bundling is not configured and one bit when spatial bundling is configured. When the HARQ-ACK transmission timing for the plurality of PDSCH is designated as the slot n+k1, UCI transmitted in the slot n+k1 includes HARQ-ACK responses for the plurality of PDSCH.
In this disclosure, a HARQ-ACK payload composed of HARQ-ACK bits of one or more PDSCH may be referred to as a HARQ-ACK codebook. According to the HARQ-ACK payload determination scheme, the HARQ-ACK codebook may be classified as i) a semi-static HARQ-ACK codebook, ii) a dynamic HARQ-ACK codebook, and iii) a HARQ-ACK codebook based on HARQ processes.
In the case of a semi-static HARQ-ACK codebook, parameters related to the HARQ-ACK payload size to be reported by the UE are determined semi-statically by (UE-specific) higher layer (e.g., RRC) signals. The HARQ-ACK payload size of the semi-static HARQ-ACK codebook (e.g., the (maximum) HARQ-ACK payload (size) transmitted through one PUCCH in one slot) may be determined based on the number of HARQ-ACK bits corresponding to a combination (hereinafter, bundling window) of all DL carriers (i.e., DL serving cells) configured for the UE and all DL scheduling slots (or PDSCH transmission slots or PDCCH monitoring slots) that may indicate HARQ-ACK transmission timing. That is, in the semi-static HARQ-ACK codebook scheme, the size of the HARQ-ACK codebook is fixed (at a maximum value) regardless of the amount of DL data actually scheduled. For example, DL grant DCI (PDCCH) includes PDSCH and HARQ-ACK timing information, and the PDSCH and HARQ-ACK timing information may have one of a plurality of values (e.g., k). For example, when PDSCH is received in slot # m and PDSCH and HARQ-ACK timing information in DL grant DCI (PDCCH) for scheduling PDSCH indicates k, HARQ-ACK information of PDSCH may be transmitted in slot # (m+k). By way of example, k ε {1,2,3,4,5,6,7,8}. When the HARQ-ACK information is transmitted in the slot #n, the HARQ-ACK information may include the maximum possible HARQ-ACK based on the bundling window. That is, the HARQ-ACK information of the slot #n may include HARQ-ACKs corresponding to the slot# (n-k). For example, when k e {1,2,3,4,5,6,7,8}, the HARQ-ACK information for slot # n may include HARQ-ACKs corresponding to slot # (n-8) to slot # (n-1) regardless of actual DL data reception (i.e., maximum number of HARQ-ACKs). Here, the HARQ-ACK information may be replaced by a HARQ-ACK codebook or a HARQ-ACK payload. The time slot may be understood/replaced with a candidate occasion for DL data reception. As described in the examples, the bundling window may be determined based on PDSCH and HARQ-ACK timing based on HARQ-ACK slots, and the PDSCH and HARQ-ACK timing set may have predefined values (e.g., {1,2,3,4,5,6,7,8 }) or may be configured by higher layer (RRC) signaling. The semi-static HARQ-ACK codebook is referred to as the Type-1 HARQ-ACK codebook. For the Type-1 HARQ-ACK codebook, the number of bits transmitted in the HARQ-ACK report is fixed and can potentially be large. The Type-1 HARQ-ACK codebook may be invalid if many cells are configured, but only some cells are scheduled.
In the case of a dynamic HARQ-ACK codebook, the HARQ-ACK payload size to be reported by the UE may be dynamically changed by DCI or the like. The dynamic HARQ-ACK codebook is called a Type-2 HARQ-ACK codebook. The Type-2 HARQ-ACK codebook may be considered as optimized HARQ-ACK feedback because the UE sends feedback only to the scheduled serving cell. However, under poor channel conditions, the UE may erroneously determine the number of serving cells scheduled. To address this issue, a Downlink Assignment Index (DAI) may be included as part of the DCI. For example, in a dynamic HARQ-ACK codebook scheme, DL scheduling DCI may include counter-DAI (i.e., c-DAI) and/or total-DAI (i.e., t-DAI). Here, the DAI indicates a downlink assignment index and is used for the BS to inform the UE of the PDSCH including its HARQ-ACK in one HARQ-ACK transmission transmitted or scheduled. Specifically, c-DAI is an index indicating an order between PDCCHs carrying DL scheduling DCI (hereinafter, DL scheduling PDCCHs), and t-DAI is an index indicating a total number of DL scheduling PDCCHs until a current slot of a PDCCH having t-DAI exists.
In the case of HARQ-ACK codebook based HARQ processes, the HARQ-ACK payload is determined based on all HARQ processes of all configured (or enabled) serving cells in the PUCCH group. For example, the size of the HARQ-ACK payload that the UE is to use HARQ-ACK codebook reporting based on HARQ processes may be determined based on the number of serving cells and the number of HARQ processes of the serving cells that are all configured or enabled in the PUCCH group configured for the UE. The HARQ-ACK codebook based on HARQ processes is also referred to as a type 3HARQ-ACK codebook. The type 3HARQ-ACK codebook may be applied to one-time feedback.
Fig. 9 shows an example of multiplexing UCI with PUSCH. When PUCCH resources and PUSCH resources overlap in slots and PUCCH-PUSCH simultaneous transmission is not configured, UCI may be transmitted on PUSCH as shown. The transmission of UCI on PUSCH is referred to as UCI piggybacking or PUSCH piggybacking. Specifically, fig. 9 shows a case where HARQ-ACK and CSI are carried on PUSCH resources.
When a plurality of UL channels overlap within a predetermined time interval, a method of designating the UE to process the UL channels is required in order to allow the BS to correctly receive the UL channels. Hereinafter, a method of handling collision between UL channels will be described.
Fig. 10 shows an example of processing of collisions between UL channels by UEs having overlapping PUCCHs in a single slot.
To transmit UCI, the UE may determine PUCCH resources for each UCI. Each PUCCH resource may be defined by a start symbol and a transmission interval. When PUCCH resources for PUCCH transmission overlap in a single slot, the UE may perform UCI multiplexing based on the PUCCH resource having the earliest starting symbol. For example, the UE may determine (in time) overlapping PUCCH resources (hereinafter, PUCCH resource B) based on the PUCCH resource having the earliest starting symbol in the slot (hereinafter, PUCCH resource a) (S1001). The UE may apply UCI multiplexing rules to PUCCH resource a and PUCCH resource B. For example, based on UCI a of PUCCH resource a and UCI B of PUCCH resource B, MUX UCI including all or part of UCI a and UCI B may be obtained according to UCI multiplexing rules. In order to multiplex UCI associated with PUCCH resource a and PUCCH resource B, the UE may determine a single PUCCH resource (hereinafter, MUX PUCCH resource) (S1003). For example, the UE determines a PUCCH resource set (hereinafter, PUCCH resource set X) corresponding to a payload size of the MUX UCI among PUCCH resource sets configured or available to the UE for the UE, and determines one of PUCCH resources belonging to the PUCCH resource set X as a MUX PUCCH resource. For example, using a PUCCH resource indicator field in the last DCI among DCIs having PDSCH-to-HARQ feedback timing indicator fields indicating the same slot for PUCCH transmission, the UE may determine one of PUCCH resources belonging to PUCCH resource set X as MUX PUCCH resource. The UE may determine the total number of PRBs of the MUX PUCCH resource based on the payload size of the MUX UCI and the maximum code rate of the PUCCH format of the MUX PUCCH resource. If the MUX PUCCH resource overlaps with other PUCCH resources (except for PUCCH resource a and PUCCH resource B), the UE may perform the above operation again based on the MUX PUCCH resource (or the PUCCH resource having the earliest starting symbol among the other PUCCH resources including the MUX PUCCH resource).
Fig. 11 illustrates a case where UCI multiplexing is performed based on fig. 10. Referring to fig. 11, when a plurality of PUCCH resources overlap in a slot, UCI multiplexing may be performed based on an earliest PUCCH resource a (e.g., PUCCH resource a having an earliest starting symbol). In fig. 11, case 1 and case 2 show that a first PUCCH resource overlaps with another PUCCH resource. In this case, the process of fig. 10 may be performed in a state where the first PUCCH resource is regarded as the earliest PUCCH resource a. In contrast, case 3 shows that the first PUCCH resource does not overlap with another PUCCH resource and the second PUCCH resource overlaps with another PUCCH resource. In case 3, UCI multiplexing is not performed on the first PUCCH resource. In contrast, the process of fig. 10 may be performed in a state where the second PUCCH resource is regarded as the earliest PUCCH resource a. Case 2 shows that the MUX PUCCH resource determined to transmit the multiplexed UCI overlaps with another PUCCH resource again. In this case, the process of fig. 10 may be additionally performed in a state where the MUX PUCCH resource (or the earliest PUCCH resource (e.g. PUCCH resource with earliest starting symbol) among other PUCCH resources including the MUX PUCCH resource) is regarded as the earliest PUCCH resource a.
Fig. 12 shows the processing of collisions between UL channels by UEs having overlapping PUCCHs and PUSCHs in a single slot.
To transmit UCI, the UE may determine PUCCH resources (S1201). The determination of PUCCH resources for UCI may include determining MUX PUCCH resources. In other words, the determination of PUCCH resources for UCI by the UE may include determining MUX PUCCH resources based on multiple overlapping PUCCHs in the slot.
The UE may perform UCI piggyback on PUSCH resources based on the determined (MUX) PUCCH resources (S1203). For example, when there are PUSCH resources on which UCI transmission is allowed to be multiplexed, the UE may apply UCI multiplexing rules to PUCCH resources overlapping (on the time axis) with PUSCH resources. The UE may send UCI on PUSCH.
When there is no PUSCH overlapping with the determined PUCCH resource in the slot, S1203 is omitted, and UCI may be transmitted on the PUCCH.
When the determined PUCCH resource overlaps with the plurality of PUSCHs on the time axis, the UE may multiplex UCI with one of the PUSCHs. For example, when the UE intends to transmit PUSCH to a corresponding serving cell, the UE may multiplex UCI on PUSCH of a specific serving cell (e.g., serving cell having the smallest serving cell index) among the serving cells. When there is more than one PUSCH in a slot of a particular serving cell, the UE may multiplex UCI on the earliest PUSCH transmitted in the slot.
Fig. 13 illustrates UCI multiplexing considering a timeline condition. When the UE performs UCI and/or data multiplexing for PUCCH and/or PUSCH overlapped on the time axis, the UE may lack processing time for UCI and/or data multiplexing due to flexible UL timing configuration for PUCCH or PUSCH. In order to prevent the processing time of the UE from being insufficient, two timeline conditions (hereinafter, multiplexing timeline conditions) described below are considered in performing UCI/data multiplexing for the PUCCH and/or PUSCH overlapped (on the time axis).
(1) The last symbol of PDSCH corresponding to HARQ-ACK information is received before time T1 from the start symbol of the earliest channel among the PUCCHs and/or PUSCHs overlapped (on the time axis). T1 may be determined based on i) a minimum PDSCH processing time N1 defined according to UE processing capability and/or ii) d1,1 predefined as an integer equal to or greater than 0 according to a location of a scheduling symbol, a PUSCH mapping type, BWP handover, and the like.
For example, T1 may be determined as follows: t1= (n1+d) 1，1 )*(2048+144)*κ*2 -u *T c . N1 is based on u of tables 8 and 9 for UE processing capabilities #1 and #2, respectively, and u is (u) PDCCH ，u PDSCH ，u UL ) One leading to a maximum T1, where u PDCCH Subcarrier spacing corresponding to PDCCH used for scheduling PDSCH, u PDSCH Subcarrier spacing corresponding to scheduled PDSCH, u UL Subcarrier spacing corresponding to UL channel to which HARQ-ACK is to be transmitted, and κ=t c /T f =64. In Table 8, at N 1，0 In the case of (2), if the PDSCH DMRS position of the added DMRS is l 1 =12, then N 1，0 =14, otherwise, N 1，0 =13 (refer to section 7.4.1.1.2 of 3gpp TS 38.211). If the last symbol of PDSCH for PDSCH mapping type a exists on the i-th slot, then for i<7，d 1，1 =7-i, otherwise, d 1，1 =0. If PDSCH has mapping type B for UE processing capability #1, then when D when the number of allocated PDSCH symbols is 7 1，1 May be 0, d when the number of allocated PDSCH symbols is 4 1，1 May be 3, d when the number of allocated PDSCH symbols is 2 1，1 May be 3+d, where d is the number of overlapping symbols of the scheduled PDCCH and the scheduled PDSCH. If the PDSCH mapping type is B for UE processing capability #2, d when the number of allocated PDSCH symbols is 7 1，1 May be 0 and d when the number of allocated PDSCH symbols is 4 1，1 May correspond to the number of overlapping symbols of the scheduled PDCCH and the scheduled PDSCH. Furthermore, if the number of allocated PDSCH symbols is 2, d when the scheduled PDSCH is within 3-symbol CORESET and PDSCH have the same starting symbol 1，1 May be 3, and for other cases d 1，1 May be the number of overlapping symbols of the scheduling PDCCH and the scheduled PDSCH. In the present disclosure, T1 may also be referred to as t_proc,1.
(2) The last symbol of the (e.g., trigger) PDCCH for indicating PUCCH or PUSCH transmission is received before time T2 from the start symbol of the earliest channel among the (on the time axis) overlapping PUCCHs and/or PUSCHs. T2 may be based on i) a minimum PUSCH preparation time N defined according to UE PUSCH timing capability 2 And/or ii) d predefined as an integer equal to or greater than 0 according to scheduled symbol positions, BWP switching, etc 2，x To determine. d, d 2，x D, which can be categorized as being related to the position of the scheduled symbol 2，1 And d related to BWP handoff 2，2 。
For example, T2 may be determined as follows: t2=max { (n2+d) 2，1 )*(2048+144)*κ*2 -u *T c +T ext +T switch ，d 2，2 }. N2 is based on u of tables 10 and 11 for UE timing capabilities #1 and #2, respectively, and u is (u) DL ，u UL ) One leading to a maximum T1, where u DL Subcarrier spacing corresponding to PDCCH carrying DCI for scheduling PUSCH, u UL Subcarrier spacing corresponding to PUSCH, and κ=t c /T f =64. D if the first symbol of PUSCH allocation consists of DMRS only 2，1 May be 0, otherwise d 2，1 May be 1. D if the scheduling DCI triggers a BWP handoff 2，2 Equal to the switching time, otherwise, d 2，2 Is 0. The switching time may be defined differently according to the Frequency Range (FR). For example, for FR1, the switching time may be defined as 0.5ms, and for FR2, as 0.25ms. In the present disclosure, T2 may also be referred to as t_proc,2.
The following table shows the processing time according to the UE processing capability. Specifically, table 8 shows PDSCH processing time for PDSCH processing capability #1 of the UE, table 9 shows PDSCH processing time for PDSCH processing capability #2 of the UE, table 10 shows PUSCH preparation time for PUSCH timing capability #1 of the UE, and table 11 shows PUSCH processing time for PUSCH timing capability #2 of the UE.
TABLE 8
TABLE 9
| u/SCS | PDSCH decoding time N 1 [ symbol ]] |
| 0/15kHz | 3 |
| 1/30kHz | 4.5 |
| 2/60kHz | For frequency ranges 1,9 |
TABLE 10
| u/SCS | PUSCH preparation time N 2 [ symbol ]] |
| 0/15kHz | 10 |
| 1/30kHz | 12 |
| 2/60kHz | 23 |
| 3/120kHz | 36 |
TABLE 11
| u/SCS | PUSCH preparation time N 2 [ symbol ]] |
| 0/15kHz | 5 |
| 1/30kHz | 5.5 |
| 2/60kHz | For frequency range 1, 11 |
The UE may report the PDSCH processing capability supported thereby to the BS for a carrier corresponding to one band entry within the band combination. For example, the UE may report, for each SCS supported in the corresponding frequency band, the UE capability as to whether the UE supports only PDSCH processing capability #1 or PDSCH processing capability # 2. The UE may report the PUSCH processing capability supported thereby for the carrier corresponding to one band entry within the band combination. For example, the UE may report, for each SCS supported in the corresponding frequency band, the UE capability as to whether the UE supports PUSCH processing capability #1 only or PUSCH processing capability # 2.
If a UE configured to multiplex different UCI types within one PUCCH intends to transmit a plurality of overlapping PUCCHs in a slot or to transmit overlapping PUCCHs and PUSCHs in a slot, the UE may multiplex UCI types when a specific condition is satisfied. The particular condition may include a multiplexed timeline condition. For example, PUCCH and PUSCH to which UCI multiplexing is applied in fig. 10 to 12 may be UL channels satisfying multiplexing timeline conditions. Referring to fig. 13, a ue may need to transmit a plurality of UL channels (e.g., UL channels #1 to # 4) in the same slot. Here, UL ch#1 may be a PUSCH scheduled by pdcch#1. UL ch#2 may be a PUCCH for transmitting HARQ-ACK for PDSCH. PDSCH is scheduled by pdcch#2, and resources of UL ch#2 may also be indicated by pdcch#2.
In this case, if UL channels (e.g., UL channels #1 to # 3) overlapping on the time axis satisfy the multiplexing time line condition, the UE may perform UCI multiplexing for UL channels #1 to #3 overlapping on the time axis. For example, the UE may check whether the first symbol of UL ch#3 from the last symbol of PDSCH satisfies the condition of T1. The UE may also check whether the first symbol of UL ch#3 satisfies the condition of T2 from the last symbol of pdcch#1. The UE may perform UCI multiplexing for UL channels #1 to #3 if the multiplexing timeline condition is satisfied. In contrast, if the earliest UL channel (e.g., UL channel with earliest starting symbol) among the overlapping UL channels does not satisfy the multiplexing timeline condition, the UE may not be allowed to multiplex all corresponding UCI types.
In some scenarios, it is specified that the UE does not expect to transmit more than one PUCCH with HARQ-ACK information in a slot. Thus, according to these scenarios, the UE may transmit at most one PUCCH with HARQ-ACK information in one slot. In order to prevent a case where the UE fails to transmit HARQ-ACK information due to a limit on the number of HARQ-ACK PUCCHs that the UE can transmit, the BS needs to perform DL scheduling so that HARQ-ACK information can be multiplexed on one PUCCH resource. However, when considering delay and reliability-critical services (e.g., URLLC services), a scheme of focusing a plurality of HARQ-ACK feedback on only one PUCCH in a slot may be undesirable in terms of PUCCH performance. Further, in order to support the delay critical service, the BS may need to schedule a plurality of consecutive PDSCH of short duration in one slot. Although the UE may transmit PUCCH in random symbols in a slot through configuration/indication of the BS, if the UE is allowed to transmit only at most one HARQ-ACK PUCC in the slot, the BS may not perform fast back-to-back scheduling of PDSCH and the UE may not perform fast HARQ-ACK feedback. Accordingly, in order to more flexibly and efficiently use resources and support services, multiple (non-overlapping) HARQ-ACK PUCCHs (or PUSCHs) may be allowed to be transmitted in one slot. Thus, in some scenarios, PUCCH feedback based on a slot comprising 14 OFDM symbols may be considered, but also PUCCH feedback based on a sub-slot comprising less than 14 OFDM symbols (e.g. 2 to 7) OFDM symbols.
UL channels may be scheduled or triggered to have different priorities. In some implementations of the disclosure, the priority of UL channels may be represented by a priority index, and UL channels with a greater priority index may be determined to have a higher priority than UL channels with a smaller priority index. In some implementations, the priority of the UL channel may be provided by DCI that schedules or triggers transmission of the UL channel or RRC configuration related to configuration grants of the UL channel. If the priority (or priority index) of the UL channel is not provided to the UE, the priority of the UL channel may be specified as a low priority (or priority index 0).
Separate codebooks may be formed/generated for HARQ-ACK feedback for multiple DL data channels (e.g., multiple PDSCH) with different service types, qoS, latency requirements, reliability requirements, and/or priorities. For example, the HARQ-ACK codebook for PDSCH associated with high priority and the HARQ-ACK codebook for PDSCH associated with low priority may be configured/formed separately. For HARQ-ACK feedback of PDSCH with different priorities, PUCCH transmissions with different priorities may consider different parameters and resource configurations (see Information Element (IE) PUCCH-configuration list of 3gpp TS 38.331). For example, if the pdsch-HARQ-ACK-codebook list is provided to the UE through RRC signaling, the pdsch-HARQ-ACK-codebook list may instruct the UE to generate one or more HARQ-ACK codebooks. When the UE is instructed to generate one HARQ-ACK codebook, the HARQ-ACK codebook is associated with PUCCH with priority index 0. When the pdsch-HARQ-ACK-codebook list is provided to the UE, the UE multiplexes only HARQ-ACK information associated with the same priority index with the same HARQ-ACK codebook. When the UE is instructed to generate two HARQ-ACK codebooks, the first HARQ-ACK codebook is associated with PUCCH with priority index 0 and the second HARQ-ACK codebook is associated with PUCCH with priority index 1.
The unit of time difference (e.g., PDSCH to harq_feedback timing indicator) between the DL data channel and PUCCH transmission for HARQ-ACK feedback transmission may be determined by a preconfigured sub-slot length (e.g., the number of symbols constituting the sub-slot). For example, a unit of a time difference from a DL data channel to a PUCCH for HARQ-ACK feedback transmission may be configured by a parameter "subslotLengthForPUCCH" in a PUCCH-config as configuration information for configuring a UE-specific PUCCH parameter. According to these scenarios, the length units of PDSCH to HARQ feedback timing indicators may be configured for each HARQ-ACK codebook.
In some scenarios, UL or DL scheduling may be performed dynamically or semi-statically, and the BS may configure or indicate the transmission direction (e.g., DL, UL, or flexible) of each symbol for or to the UE using a tdd-UL-DL-configuration command or a tdd-UL-DL configuration decoded message or using DCI format 2_0 statically. UL or DL scheduling configured by the configured/indicated transmission direction may also be cancelled.
Fig. 14 illustrates an exemplary HARQ-ACK deferral.
In some scenarios (e.g., 3GPP NR Rel-16), if the UE receives a PDSCH scheduled by the BS, the UE may transmit a PUCCH carrying HARQ-ACK for the PDSCH (hereinafter, HARQ-ACK PUCCH) at a time specified by scheduling information for the PDSCH. However, these series of operations always cause the UE to transmit the PUCCH after a predetermined time has elapsed since receiving the SPS PDSCH of the semi-persistent configuration. As a result, a TDD mode that is not aligned with a period of the SPS PDSCH may be used, or PUCCH transmission may be easily canceled by dynamic TDD operation of the BS. In addition, PDSCH transmission associated with the cancelled PUCCH transmission may be cancelled or retransmission may be requested. To solve these problems, it is being considered that the UE defers the operation of PUCCH timing determined for PDSCH, i.e., the deferred operation, in a prescribed or arbitrary manner. For example, when a PUCCH configured to carry HARQ-ACK for SPS PDSCH (hereinafter, referred to as SPS HARQ-ACK) is cancelled by the configured or indicated transmission direction, HARQ-ACK deferral, which delays HARQ-ACK transmission after an initial expected time, may be considered. Referring to fig. 14, for example, when the SPS PDSCH in the slot #m-1 uses the HARQ process #i, and when the HARQ-ACK transmission for the SPS PDSCH is scheduled in the slot #m, the UE may determine to defer the PUCCH for the HARQ-ACK transmission for the SPS PDSCH from the slot #m to the slot #n based on a predetermined condition. According to such HARQ-ACK deferral, the UE and the BS may transmit/receive HARQ-ACK information for the SPS PDSCH later even if PUCCH transmission is cancelled.
For HARQ-ACK responses that may not be transmitted due to TDD related configuration or indication from the BS (e.g., when the HARQ-ACK response for the SPS PDSCH overlaps in time with the symbols allocated for DL by the BS by the IE TDD-UL-DL-ConfigCommon), if the UE and BS intend to defer transmission and reception of the HARQ-ACK response, but if there are other UL transmissions in the corresponding slots, there may be a problem from the perspective of ensuring HARQ-ACK transmission for the UE as to how to handle the HARQ-ACK response and other UL transmissions. Hereinafter, an implementation of an operation for determining whether to perform deferral of UCI transmission in consideration of UL multiplexing with other UL transmissions will be described. In addition, an implementation for determining PUCCH resources or PUSCH resources for deferred UCI transmission in consideration of multiplexing between UCI and other UL transmissions that are prescheduled or preconfigured in a target slot to which UCI transmission is deferred will be described.
In some scenarios of a communication system employing TDD (e.g., an LTE-based communication system), a UE may determine a subframe for transmitting a HARQ-ACK response based on a given TDD configuration and DL subframes for receiving PDSCH according to a predefined table. This allows to avoid collisions between HARQ-ACK responses and transmissions of DL subframes. In the NR based wireless communication system, the BS can more flexibly perform PDSCH/PUSCH scheduling. In addition, even if the UE receives PDSCH in the same slot, the UE may transmit HARQ-ACK response for the received PDSCH in different slots with different pdsch_to_harq-ACK feedback timing. For dynamic scheduling, the BS may prevent collision between HARQ-ACK response transmission and DL subframes based on such flexibility. However, for SPS PDSCH transmissions based on semi-persistent scheduling and HARQ-ACK response transmissions for SPS PDSCH, a single HARQ-ACK feedback timing indicated during activation of SPS PDSCH is used consecutively (e.g., a value determined based on DCI activation PDSCH to harq_feedback timing indicator in DL SPS). As a result, it is difficult to flexibly change the HARQ-ACK response time according to the reception time of the SPS PDSCH. In this case, collision may inevitably occur between DL slots/symbols and PUCCH resources for HARQ-ACK response, which is based on TDD configuration. Although these problems may be partially addressed by deferring HARQ-ACK transmissions, challenges may exist when performing deferred HARQ-ACK transmissions as well as other PUCCH transmissions previously indicated or configured.
Accordingly, the present disclosure proposes a method for a UE to determine whether HARQ-ACK PUCCH resources are available and a method for the UE to transmit a corresponding PUCCH in a next available slot if HARQ-ACK PUCCH resources are not available. In addition, the present disclosure proposes a method of determining whether a HARQ-ACK response can be transmitted in a corresponding slot by considering HARQ-ACK PUCCH resources and other PUCCH resources overlapping in time with the HARQ-ACK PUCCH resources. Further, the present disclosure proposes a method and procedure for selecting PUCCH resources for HARQ-ACK transmission in consideration of UL multiplexing with other UL transmissions in another slot when HARQ-ACK response is not allowed to be transmitted in a specific slot and thus deferred to another slot.
UE side
Fig. 15 illustrates an operational flow of a UE according to some implementations of the present disclosure.
In some implementations, the UE may be configured with higher layer parameters for determining PUCCH transmissions and their slot formats. The UE may then schedule with PDSCH in DL scheduling DCI provided from the BS, or configure/activate with SPS PDSCH through higher layer configuration and DCI. The UE may receive the scheduled PDSCH (S1501) and transmit the PUCCH in response to the scheduled PDSCH. In addition, the UE may defer a specific PUCCH transmission based on the indicated or configured PUCCH transmission (S1503), and multiplex the deferred PUCCH transmission with other PUCCH transmissions (S1505).
Hereinafter, exemplary UE operations according to some implementations of the present disclosure will be described.
1) The UE receives one or more RRC configurations for SPS PDSCH reception and PUCCH transmission from the BS. For each SPS PDSCH configuration, a PUCCH configuration for the corresponding SPS PDSCH configuration may be received. For example, each SPS PDSCH configuration may include information on HARQ resources for PUCCH for DL SPS. The actual PUCCH resources may be configured by a PUCCH configuration, and the PUCCH resources for the corresponding SPS PDSCH configuration may be referenced by a PUCCH resource Identifier (ID). Each SPS PDSCH configuration may include information about the number of HARQ processes configured for DL SPS and HARQ process ID offset used to derive HARQ process IDs.
2) The UE may receive an SPS PDSCH activation indication from the BS.
3) The UE may receive the SPS PDSCH based on the SPS PDSCH activation indication and the RRC configuration provided by the BS.
4) The UE may transmit a HARQ-ACK PUCCH for the received SPS PDSCH based on the SPS PDSCH activation indication and the RRC configuration provided by the BS. According to some implementations of the present disclosure, the UE may determine whether to allow the UE to transmit a HARQ-ACK response for the received SPS PDSCH by considering other indicated/configured PUCCH resources that overlap in time with the configured HARQ-ACK PUCCH resources, the type and size of UCI to be transmitted, and the transmission direction (e.g., slot format) of the slots/symbols. For example, if the SPS HARQ-ACK PUCCH overlaps with a semi-static DL symbol (e.g., a set of symbols indicated as DL by RRC configuration tdd-UL-DL-configuration command or tdd-UL-DL-configuration command), an SSB symbol (e.g., a set of symbols indicated to the UE by SIB1 or SSB-posisinburst in servingcellconfiguration command for receiving SS/PBCH blocks), and/or an ORESET #0 (e.g., a set of symbols indicated to the UE by PDCCH-configsb 1 in a Main Information Block (MIB) of CORESET for Type0-PDCCH CSS), the UE may determine not to allow transmission of HARQ-ACK response for the received SPS PDSCH. As another example, if PUCCH resources selected in consideration of UL multiplexing with other UCI transmissions (e.g., SR, periodic/semi-persistent CSI, etc.) provided by the BS overlap with semi-static DL symbols (e.g., symbol set indicated as DL by RRC configuration tdd-UL-DL-configuration command or tdd-UL-DL configuration decoded), SSB symbols (e.g., symbol set indicated to the UE by SIB1 or SSB-position inburst in servingcellconfiguration command for receiving SS/PBCH blocks), and/or ORESET #0 (e.g., symbol set of slots indicated to the UE by PDCCH-ConfigSIB1 in a Master Information Block (MIB) of CORESET for Type0-PDCCH CSS set). The UE may determine that transmission of HARQ-ACK response for the received SPS PDSCH is not allowed by the symbol set of the slot indicated to the UE by the pdfch-ConfigSIB 1 in MIB of CORESET for Type0-PDCCH CSS set.
5) If transmission of HARQ-ACK response for the received SPS PDSCH is not allowed, the UE defers the PDSCH-to-HARQ-ACK feedback timing K1 corresponding to the HARQ-ACK response by K1 def So that k1' =k1+k1 def . By doing so, the received PDSCH has a new PDSCH to HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. In this case, K1' or K1 def May be determined by L1 or higher layer signaling from the BS, and/or may have a predefined value.
6) If the deferred PUCCH overlaps in time with other PUCCH transmissions in step 5), the UE may multiplex the PUCCH transmission with UCI to be transmitted according to some implementations of the present disclosure.
In some implementations of the present disclosure, the following UE operations may be considered.
< implementation A1> determining availability of PUCCH for HARQ-ACK for SPS PDSCH reception
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the UE may defer the PDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 of the corresponding HARQ-ACK response by K1 def So that k1' =k1+k1 def . By doing so, the received PDSCH has a new PDSCH to HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. The UE may determine whether to allow transmission of the HARQ-ACK response using at least one of the following methods.
* Method A1-1 for a particular PUCCH (PUCCH A) carrying HARQ-ACK for SPS PDSCH reception, the UE determines that transmission of PUCCH A is not allowed if the PUCCH carrying HARQ-ACK feedback for SPS PDSCH (used when it is assumed that there are no other PUCCHs in a given slot) satisfies the following condition. For example, based on the size of SPS HARQ-ACK bits transmitted in the corresponding slots, such PUCCH may be a PUCCH for SPS HARQ-ACK transmission determined by PUCCH-config in SPS-PUCCH-AN-List as configuration information for configuring UE-specific PUCCH parameters or n1PUCCH-AN in SPS-config as configuration information for configuring DL semi-persistent transmission. In this document, SPS-PUCCH-AN-List refers to AN RRC IE for configuring a PUCCH resource List for each HARQ-ACK codebook, and n1PUCCH-AN refers to a PUCCH resource ID indicating HARQ resources for PUSCH for DL SPS. The actual PUCCH resources are configured by PUCCH-config and referenced by ID. Details of the parameters in PUCCH-config and parameters in SPS-config can be found in 3gpp TS 38.331.
The above conditions may include when PUCCH a overlaps in time with at least one of the following symbols: semi-static DL symbols (e.g., a set of symbols indicated as DL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); semi-static flexible symbols (e.g., symbol sets not indicated as DL or UL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); SSB symbols (e.g., a set of symbols indicated to the UE by SIB1 or SSB-positioninburst in ServingCellConfigCommon for receiving SS/PBCH blocks); and/or ORESET#0 (e.g., MIB of COESET for Type0-PDCCH CSS set). For example, for a specific SPS HARQ-ACK transmission, if the number of SPS HARQ-ACK bits to be transmitted is X bits without considering other PUCCH scheduling, PUCCH resource a may be selected from SPS-PUCCH-AN-List in RRC configuration PUCCH-config. If one or more symbols occupied by the selected PUCCH resource a are indicated as DL by RRC configured tdd-UL-DL-configuration command, the UE and BS may determine not to allow SPS HARQ-ACK transmission.
In some implementations of method A1-1, the above conditions may be applied to indicate a CC for PUCCH transmission by a BS or to allow all CCs for PUCCH transmission thereon if the CC (e.g. PUCCH cell) on which PUCCH transmission is to be performed is dynamically indicated or if such CC changes for each PUCCH transmission according to a predetermined rule. In other words, if the CC (if any) for PUCCH transmission and all CCs on which PUCCH transmission is allowed are indicated by the BS satisfy the above condition, it may be determined that PUCCH a transmission is not allowed.
* Method A1-2: for a particular PUCCH (PUCCH A) carrying HARQ-ACKs for SPS PDSCH reception, the UE determines that transmission of PUCCH a is not allowed if the PUCCH used when multiplexed with other UL transmissions in a given slot is assumed to satisfy the following condition.
The above conditions may include when PUCCH a overlaps in time with at least one of the following symbols: semi-static DL symbols (e.g., a set of symbols indicated as DL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); semi-static flexible symbols (e.g., symbol sets not indicated as DL or UL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); SSB symbols (e.g., a set of symbols indicated to the UE by SIB1 or SSB-positioninburst in ServingCellConfigCommon for receiving SS/PBCH blocks); and/or ORESET#0 (e.g., MIB for COESET for the Type0-PDCCH CSS set).
In some implementations of methods A1-2, "other UL transmissions" may be limited to PUCCH transmissions or PUCCH transmissions carrying a particular type of UCI. The specific type of UCI may be HARQ-ACK, HARQ-ACK and SR, or HARQ-ACK and CSI.
Alternatively, in some embodiments of methods A1-2, "other UL transmissions" may be limited to semi-statically configured PUCCH transmissions. For example, "other UL transmissions" may be limited to SR PUCCH occasions or periodic/quasi-persistent CSI. The reason for this is that the UE needs to make a selection regarding dynamic scheduling up to a specific point in time in order to ensure the processing time of the UE in consideration of PUCCH transmission indicated by dynamic scheduling. Accordingly, if the HARQ-ACK deferral operation is performed in consideration of PUCCH transmission indicated by dynamic scheduling, complexity of the HARQ-ACK deferral operation may be increased and implementation difficulty of the UE may be increased.
In some implementations of methods A1-2, when performing HARQ-ACK transmission for a dynamically scheduled PDSCH, the UE may expect that the BS will schedule the PDSCH such that HARQ-ACK transmission is always allowed, and then determine that it is feasible to transmit HARQ-ACK response for the dynamically scheduled PDSCH in the scheduled time slot. In other words, the method may be adopted by assuming that PUCCH transmission indicated by the BS through dynamic scheduling is always enabled in a corresponding slot, thereby reducing implementation difficulty of the UE.
As an example of method A1-2, when the UE intends to transmit multiplexed UCI X bits on one or more overlapping PUCCH resources including SPS HARQ-ACK PUCCH according to the method described in section 9 of 3gpp TS 38.213, the UE may select PUCCH resource a. When one or more symbols occupied by the selected PUCCH resource a are indicated as DL by RRC configuration tdd-UL-DL-configuration command, the UE and the BS may determine not to allow SPS HARQ-ACK transmission. When it is determined that SPS HARQ-ACK transmission is not allowed, the UE may transmit all or some of the Y bits of the multiplexed UCI X bits on the deferred PUCCH resource. In this case, the Y bits may be SPS HARQ-ACK bits among the X bits.
In some implementations of methods A1-2, the above conditions may be applied to indicate a CC for PUCCH transmission by a BS or to allow all CCs for PUCCH transmission thereon if the CC on which PUCCH transmission is to be performed (i.e. PUCCH cell) is dynamically indicated or if such CC changes for each PUCCH transmission according to a predetermined rule. In other words, if the CC (if any) for PUCCH transmission and all CCs on which PUCCH transmission is allowed are indicated by the BS satisfy the above condition, it may be determined that PUCCH a transmission is not allowed.
< implementation A2> determines PUCCH resources for deferred HARQ-ACK with UL multiplexing
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the UE may defer the PDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 of the corresponding HARQ-ACK response by K1 def So that k1' =k1+k1 def . In other words, the UE may defer transmission of the corresponding HARQ-ACK response from the time slot of the initial indication/configuration transmission (hereinafter referred to as initial time slot) to another time slot (hereinafter referred to as target time slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. The UE may multiplex and transmit UCI including a deferred HARQ-ACK with other UL transmissions in a target slot determined based on HARQ timing obtained from HARQ deferral. In this case, PUCCH resources for transmitting the multiplexed UCI may be selected according to at least one of the following methods. The UE may select a different method according to UCI to be transmitted in the target slot.
* Method A2-1: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot (slot n), the UE may select PUCCH resources according to the following procedure.
Process A2-1-1. Without considering deferred PUCCH, the UE determines PUCCH resources for transmission considering the number of UCI bits to be transmitted after multiplexing with UL transmission indicated/configured in slot n, the indicated PUCCH resource set, the type of UCI to be transmitted, etc. In this case, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
Process A2-1-2 when one or more PUCCH resources determined by process A2-1-1 overlap in time with a deferred PUCCH resource, or when there is a PUCCH carrying HARQ-ACK among PUCCH resources determined by process A2-1-1, the UE may transmit UCI bits to be transmitted on the corresponding PUCCH resource together with deferred UCI bits. Otherwise, the UE independently transmits deferred PUCCH resources. If the deferred HARQ-ACK is AN SPS HARQ-ACK, then the "deferred PUCCH resource" may be a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of the deferred SPS HARQ-ACK bits (i.e., the number of deferred SPS HARQ-ACK bits). Alternatively, the "deferred PUCCH resource" may be a PUCCH resource selected to transmit UCI including HARQ-ACK in the initial slot, i.e., a PUCCH resource selected in consideration of UL multiplexing in the initial slot. For example, a PUCCH resource having the same PUCCH resource ID as the PUCCH resource ID selected in consideration of UL multiplexing in the initial slot may be used as the "deferred PUCCH resource". In some implementations, the UE may transmit the deferred UCI bits together on the earlier-starting PUCCH resource when the deferred PUCCH resource and the two or more PUCCH resources determined by procedure A2-1-1 overlap simultaneously in time. The reason for this is to minimize the delay time of the deferred UCI bits. In some implementations, the UE may not desire to transmit the deferred UCI bits together on PUCCH resources carrying UCI having a size less than or equal to two bits. In some implementations, when the UE independently transmits deferred PUCCH resources, the UE may expect the total number of PUCCHs including deferred PUCCH resources to be transmitted in the target slot to be 2 or less. Further, the UE may expect that other PUCCH transmissions in the target slot do not carry HARQ-ACKs.
Process A2-1-3. If the PUCCH resource determined by process A2-1-1 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits given by process A2-1-2 to be transmitted on the corresponding PUCCH resource on the overlapping PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
* Method A2-2: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot, the UE may select PUCCH resources according to the following procedure.
Procedure A2-2-1 the UE determines PUCCH resources for transmission considering the size of UCI bits to be transmitted, the indicated PUCCH resource set and the type of UCI to be transmitted when the deferred UCI transmission (or PUCCH resource on which the deferred UCI transmission is to be performed) is multiplexed with UL transmission indicated/configured in slot n. In this case, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used. If the deferred HARQ-ACK is AN SPS HARQ-ACK, the PUCCH resource to consider for "deferred UCI transmission" for UL multiplexing may be a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of the deferred SPS HARQ-ACK bit. Alternatively, the PUCCH resource to be considered for the "deferred UCI transmission" of UL multiplexing may be a PUCCH resource selected to transmit the corresponding UCI in the initial slot, i.e., a PUCCH resource selected in consideration of UL multiplexing in the initial slot.
Procedure A2-2-2. If the PUCCH resource determined by procedure A2-2-2 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits to be transmitted on the corresponding PUCCH resource on the overlapped PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
* Method A2-3: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot, the UE may select PUCCH resources according to the following procedure.
Process A2-3-1 as if there is no deferred PUCCH, the UE determines PUCCH resources for transmission considering the size of UCI bits to be transmitted, the indicated PUCCH resource set, and the type of UCI to be transmitted after multiplexing with UL transmission indicated/configured in slot n. In this case, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
Process A2-3-2 when one or more PUCCH resources determined by process A2-3-1 overlap in time with a deferred SPS HARQ-ACK PUCCH resource, or when there is a PUCCH carrying HARQ-ACK among PUCCH resources determined by process A2-3-1, the UE transmits deferred UCI bits together on the corresponding resources according to at least one of the following conditions (method A2-3-1). Alternatively, the UE may transmit UCI bits of UL transmissions indicated/configured in slot n (method A2-3-2) along with deferred UIC bits on PUCCH resources used when multiplexing the deferred UCI transmissions with UL transmissions indicated/configured in slot n. In some implementations, the UE may select method A2-3-1 if the PUCCH resource a bearer has a UCI with a size greater than two bits. In some implementations, the UE may select method A2-3-2 if the PUCCH resource a bearer has a UCI with a size less than or equal to two bits. In some implementations, the UE may select method A2-3-2 if PUCCH resource a is a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config, i.e. a PUCCH resource carrying SPS HARQ-ACK only. When using method A2-3-2, if the deferred HARQ-ACK is SPS HARQ-ACK, the PUCCH resource to consider for "deferred UCI transmission" for UL multiplexing may be a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of the deferred SPS HARQ-ACK bit. When using method A2-3-2, PUCCH resources to be considered for "deferred UCI transmission" for UL multiplexing may be PUCCH resources selected to transmit the corresponding UCI in the initial slot, i.e., PUCCH resources selected in consideration of UL multiplexing in the initial slot. When the deferred SPS HARQ-ACK PUCCH resource and the two or more PUCCH resources determined by procedure A2-3-1 overlap simultaneously in time, the UE may transmit deferred UCI bits together on the earlier-starting PUCCH resource. The reason for this is to minimize the delay time of the deferred UCI bits.
Process A2-3-3. If the PUCCH resource determined by process A2-3-1 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits given by process A2-3-2 to be transmitted on the corresponding PUCCH resource on the overlapping PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
When implementing implementation A2, the UE may determine an earliest or sub-slot including available resources as a target slot instead of selecting resources in the determined target slot. That is, the UE may determine a target slot for deferred transmission based on the presence of resources capable of transmitting deferred HARQ-ACKs.
< implementation A3> special handling with maximum payload size of PUCCH resource set
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the UE may defer the PDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 of the corresponding HARQ-ACK response by K1 def So that k1' =k1+k1 def . In other words, the UE may defer transmission of the corresponding HARQ-ACK response from the time slot of the initially indicated/configured transmission (hereinafter referred to as initial time slot) to another time slot (hereinafter referred to as target time slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. The UE may multiplex and transmit UCI including deferred HARQ-ACKs with other UL transmissions in a target slot determined based on HARQ timing obtained from the HARQ deferral.
The UE and BS may determine PUCCH resources on which to multiplex and transmit the deferred UCI transmission with the UCI of another UL transmission according to implementation A2/B2 or any method similar thereto. When determining PUCCH resources without considering deferred UCI as in method A2-1/B2-1 implementing embodiment A2/B2, the maximum UCI bit size (e.g., maximum payload size maxPayloadSize) configured for the determined PUCCH resources or PUCCH resource set including the determined PUCCH resources may become smaller than the number of UCI bits including the actual transmission of deferred UCI. In this case, the following method can be considered.
* Method A3-1: the entire deferred UCI may not be transmitted. In this case, if the UE determines PUCCH resources in consideration of the deferred UCI (e.g., if the UE selects a PUCCH resource set in consideration of the deferred UCI), the UE may determine PUCCH resources again by excluding the deferred UCI.
* Method A3-2: some portions of the deferred UCI may not be transmitted. In this case, the following method can be considered.
* Method A3-2-1: CSI (if any) included in the deferred UCI may be excluded until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size.
* Method A3-2-2: the SRs (if any) included in the deferred UCI may be excluded until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size.
* Method A3-2-3: HARQ-ACKs (if any) included in the deferred UCI may be excluded until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size. In this case, each HARQ-ACK bit may be sequentially excluded according to the reception timing of the PDSCH associated with the corresponding HARQ-ACK bit. To ensure maximum delay of PDSCH supported services, HARQ-ACKs associated with the most recently received PDSCH may be excluded first. Alternatively, the HARQ-ACK associated with the earliest received PDSCH may be excluded first to receive the PDSCH with the shortest delay. Excluding HARQ-ACKs associated with the earliest received PDSCH from transmissions enables dropping HARQ-ACK transmissions for PDSCH reception beyond the maximum delay and reduces delays in meaningful transmissions.
* Method A3-2: bit bundling can be performed at regular intervals (e.g., every two bits) to transmit HARQ-ACKs in the deferred UCI or with the deferred UCI.
* Method A3-3: the UE may not perform transmission on the corresponding PUCCH resource. Alternatively, the UE may not expect UCI bits to be transmitted including deferred UCI to exceed a maximum UCI bit size (e.g., maxPayloadSize) configured for the PUCCH resource set.
< implementation A4> processing with/without inter-UE multiplexing between different priorities
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the UE may respond toPDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 of HARQ-ACK response defers K1 def So that k1' =k1+k1 def . In other words, the UE may defer transmission of the corresponding HARQ-ACK response from the time slot of the initially indicated/configured transmission (hereinafter referred to as initial time slot) to another time slot (hereinafter referred to as target time slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0.
The UE may multiplex and transmit UCI including a deferred HARQ-ACK with another UL transmission in a target slot determined based on HARQ timing obtained from the HARQ deferral. As another example, if UCI including deferred HARQ-ACK is allowed to be transmitted in a specific slot or if deferred HARQ-ACK is allowed to be transmitted in a specific slot, even if transmission of UCI including deferred HARQ-ACK is multiplexed with another UL transmission in a specific slot, the UE may determine the earliest slot among the slots as a target slot and then multiplex and transmit UCI including deferred HARQ-ACK with another UL transmission in the determined target slot.
The UE and BS may consider the following first when the UE supports UL multiplexing between different priorities (i.e., multiplexing within the inter-priority UE) and is thus able to transmit UCI and/or UL-SCH scheduled by different HARQ-ACK codebook priorities or different priority indicators on a single PUCCH and/or PUSCH resource, and when the UE is allowed to perform HARQ-ACK deferral operations.
1) Case 1: when transmission of a PUCCH on which a high (or Higher) Priority (HP) UCI and a low (or Lower) Priority (LP) UCI are not allowed, if one of UCI includes a HARQ-ACK bit for which HARQ-ACK deferral operation is configured, then
* Method A4a-1: the UE may perform the deferral operation regardless of the priority of the HARQ-ACK bit for which the deferral operation is configured.
* Method A4a-2: the UE may perform the deferral operation only on the HP HARQ-ACK bit among the HARQ-ACK bits configured with the deferral operation.
* Method A4a-3: the UE may perform the deferral operation only on LP HARQ-ACK bits among HARQ-ACK bits configured with the deferral operation.
* Method A4a-4: the UE may perform a deferral operation only on HARQ-ACK bits having the same priority as a PUCCH (e.g., HP PUCCH) on which HP UCI and LP UCI are multiplexed among HARQ-ACK bits for which the deferral operation is configured.
* Method A4a-5: before intra-priority UE multiplexing, the UE may determine whether to perform deferral operation based on a PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method A4a-5-1: prior to intra-priority UE multiplexing, if the UE determines to not allow transmission of PUCCH for which the bearer is configured with the deferred HARQ-ACK bits for the following reasons: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the UE may perform a deferral operation for the corresponding HARQ-ACK bit.
* Methods A4a-6: the UE may perform the deferral operation only when at least one HARQ-ACK bit for which the deferral operation is configured is included in each of the HP UCI and the LP UCI.
* Methods A4a-7: the UE does not perform deferral operations.
In some implementations, these methods (e.g., methods A4a-1 through A4 a-7) may be limited to the case where the PUCCH on which HP and LP HARQ-ACKs are multiplexed is derived from PUCCH resources for SPS HARQ-ACK transmission (e.g., PUCCH resources or PUCCH resource sets configured by parameter n1PUCCH or parameter SPS-PUCCH-AN-List-r 16).
In some implementations, these operations (e.g., methods A4a-1 through A4 a-7) may be limited to the case where the PUCCH on which HP and LP HARQ-ACKs are multiplexed is an HP PUCCH. In other words, the corresponding PUCCH may be a PUCCH resource set to HP or a resource for HARQ-ACK codebook indicated as HP.
In some implementations, when applying method A4a-5, method A4a-5 may be combined with method A4a-1/A4a-2/A4a-3/A4 a-4. For example, when combining method A4a-2 and method A4a-5, the UE may determine whether to perform deferral operations on HP HARQ-ACK bits according to method A4a-5 and may not perform deferral operations on LP HARQ-ACK bits. As another example, when combining the methods A4a-4 and A4a-5, the UE may determine whether to perform deferral operation on HARQ-ACK bits of the same priority as a PUCCH (e.g., HP PUCCH) on which HP UCI and LP UCI are multiplexed according to the method A4a-5, and may not perform deferral operation on HARQ-ACK bits of different priorities.
2) Case 2: when transmission of PUSCH on which HP and LP HARQ-ACKs are not allowed to be multiplexed,
* Method A4b-1: the UE does not perform deferral operations.
* Method A4b-2: before intra-priority UE multiplexing, the UE may determine whether to perform deferral operation based on a PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method A4b-2-1: prior to intra-priority UE multiplexing, if the UE determines PUCCH for which the transport bearer is not allowed to be configured with the HARQ-ACK bits for deferred operation for the following reasons: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the UE may perform a deferral operation on the corresponding HARQ-ACK bit.
These operations may be limited to the case where the PUSCH on which the HP and LP HARQ-ACKs are multiplexed is the HP PUSCH. In other words, the corresponding PUSCH may be a PUSCH resource set as HP or a PUSCH resource indicated as HP.
3) Case 3: when HP PUCCH or HP PUSCH is prioritized and transmitted, but LP PUCCH or LP PUSCH and LP UCI are not prioritized, and thus are not transmitted after a procedure for multiplexing HP PUCCH or HP PUCCH and LP PUSCH or LP PUSCH, if LP UCI includes HARQ-ACK bits for which HARQ-ACK deferral operations are configured, then
* Method A4c-1: the UE does not perform deferral operations (for the untransmitted LP UCI and LP PUCCH/PUSCH).
* Method A4c-2: before intra-priority UE multiplexing, the UE may determine whether to perform deferral operation based on a PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method A4c-2-1: prior to intra-priority UE multiplexing, if the UE determines to not allow transmission of PUCCH for which the bearer is configured with the deferred HARQ-ACK bits for the following reasons: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the UE may perform a deferral operation on the corresponding HARQ-ACK bit.
If the PUCCH transmission scheduled (or expected) in the initial slot undergoes a HARQ-ACK deferral operation according to a predetermined condition, the UE performs the deferred HARQ-ACK transmission in the earliest target slot and/or on the earliest target resource.
When performing HARQ-ACK deferral operations on LP HARQ-ACKs and/or HP HARQ-ACKs, there may be a problem as to how to determine the earliest target time slot/resource for deferred LP HARQ-ACKs and/or deferred HP HARQ-ACKs.
Fig. 16 illustrates HARQ-ACK deferral for HP and LP HARQ-ACKs according to some implementations of the present disclosure. Fig. 16 shows an example in which a time slot in which transmission of HP HARQ-ACK X1 is scheduled (i.e., an initial time slot of HP HARQ-ACK X1) and a time slot in which transmission of LP HARQ-ACK X2 is scheduled (i.e., an initial time slot of LP HARQ-ACK X2) are identical (i.e., both are time slots m). However, the implementations of the present disclosure may be applied even when the initial time slot for transmitting the HP HARQ-ACK X1 and the initial time slot for transmitting the LP HARQ-ACK X2 are different.
In some implementations of the present disclosure, when the LP HARQ-ACK and/or the HP HARQ-ACK are subject to deferral operations, the UE may determine a target slot/resource for the HARQ-ACK deferral operations in consideration of the following method.
* Method A4-1: the UE may defer HARQ-ACK transmission to a slot or sub-slot including PUSCH and/or PUCCH for carrying both deferred LP HARQ-ACKs and/or deferred HP HARQ-ACKs.
Referring to fig. 16 (a), when HP HARQ-ACK X1 and LP HARQ-ACK X2 in an initial slot (slot m) undergo HARQ-ACK deferral according to a predetermined or predefined condition, if PUSCH and/or PUCCH for carrying all deferrals X1 and X2 scheduled for transmission in slot m+1 and HP HAR-ACK Y1 exist in slot m+1, where slot m+1 is adjacent to slot m, the UE may determine slot m+1 as a target slot. Otherwise, the UE may determine whether deferred X1 and X2 and Y1 can be transmitted together in slot m+2. If there is another HARQ-ACK scheduled for transmission in slot m+2, then the other HARQ-ACK may also be considered with X1, X2, and Y1 in determining whether slot m+2 is used as the target slot.
In method A4-1, PUSCH and/or PUCCH resources determined by the inter-priority UE intra-multiplexing procedure may be used to determine PUSCH and/or PUCCH resources for transmitting both LP and/or HP HARQ-ACKs. For example, even when the UE uses a PUCCH resource set for HP UCI scheduled to the UE in slot n to multiplex the scheduled HP UCI with deferred HARQ-ACK, the UE may defer transmission of HARQ-ACK to slot n if the UE is allowed to transmit using UL resources. As another example, if the available LP/HP PUSCH resources scheduled to the UE in slot n overlap with PUCCH resources for or multiplexed with deferred HARQ-ACKs, the UE may defer transmission of HARQ-ACKs to slot n.
When the HARQ-ACK transmission overlaps with the DL symbol in the slot and thus the HARQ-ACK transmission is not allowed in the slot, HARQ-ACK deferral may be performed to provide the HARQ-ACK to the BS in another slot. According to the method A4-1, since the UE and the BS determine a slot including PUSCH or PUCCH resources capable of transmitting both LP HARQ-ACK and HP HARQ-ACK as a target slot, there is an advantage in that the LP HARQ-ACK is likely to be provided to the BS without being discarded.
* Method A4-2: the UE performs a HARQ-ACK deferral operation for the LP HARQ-ACK to be deferred and/or the HP HARQ-ACK to be deferred for each priority. In other words, in consideration of deferring the priority of HARQ-ACKs, the UE may defer transmission of HARQ-ACKs having the same priority to a slot or sub-slot including PUSCH and/or PUCCH for carrying all HARQ-ACKs having the corresponding priority. According to method A4-2, the LP HARQ-ACK and the HP HARQ-ACK may be deferred to different time slots.
For example, the UE may determine a target slot/target resource for each priority when the HP HARQ-ACK X1 and the LP HARQ-ACK X2 in the initial slot (slot m) experience HARQ-ACK deferral according to a predetermined or predefined condition. Referring to fig. 16 (b), for HP, if PUSCH and/or PUCCH for carrying X1, which is a subject of HARQ-ACK deferral, and HP HARQ-ACK Y1 scheduled for transmission in slot m+1 exist in slot m+1, where slot m+1 is adjacent to slot m, the UE may determine slot m+1 as a target slot for transmission of X1 and Y2. Otherwise, the UE may determine whether deferred X1 and Y1 can be transmitted together in the next time slot (time slot m+2). If there is another HP HARQ-ACK scheduled for transmission in slot m+2, then another UCI may also be considered with X1 and Y1 in determining whether slot m+2 is used as the target slot for the transmission of HP HARQ-ACK. Referring to fig. 16 (b), for LP, if PUSCH and/or PUCCH for carrying X2, which is a subject of HARQ-ACK deferral, exists in a slot m+1, where slot m+1 is adjacent to slot m, the UE may determine slot m+1 as a target slot for transmitting X2. Otherwise, the UE may determine whether deferred X2 can be transmitted in the next slot (slot m+2). If there is another LP HARQ-ACK, LP HARQ-ACK Y2, scheduled for transmission in slot m+2, then another UCI, UCI Y2, may also be considered with X2 in determining whether slot m+2 is used as the target slot for transmission of the LP HARQ-ACK.
* Method A4-2-1: in some implementations, the UE may not consider inter-priority UE intra-multiplexing in determining PUSCH and/or PUCCH for carrying all HARQ-ACKs of the same priority. For example, when the UE performs UL multiplexing in a slot for each priority before performing intra-priority UE multiplexing, if the derived PUCCH or PUSCH does not overlap in time with semi-static DL symbols, SSB, and CORESET #0, the UE may defer HARQ-actr transmission to the corresponding slot.
In some implementations of method A4-2-1, when the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and the PUCCH or PUSCH derived for the deferred LP HARQ-ACK overlap each other in time within the same time slot, if the UE is not configured to perform UCI multiplexing for different priorities, the UE may transmit the deferred HP HARQ-ACK through the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and discard the transmission of the deferred LP HARQ-ACK. In some other implementations of method A4-2-1, when the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and the PUCCH or PUSCH derived for the deferred LP HARQ-ACK overlap each other in time within the same time slot, if the UE is configured to perform UCI multiplexing for different priorities, the UE may determine the PUCCH or PUSCH for multiplexing the deferred HP HARQ-ACK and the deferred LP HARQ-ACK in the time slot and then transmit the deferred HP HARQ-ACK and the deferred LP HARQ-ACK on the determined PUCCH or PUSCH. In some implementations, if the determined PUCCH or PUSCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0 in the slot, the UE may discard or skip transmitting the deferred HP HARQ-ACK and the deferred LP HARQ-ACK.
* Method A4-2-2: in some implementations, the UE may consider inter-priority UE intra-multiplexing when determining PUSCH and/or PUCCH for carrying all HARQ-ACKs of the same priority. For example, when the UE performs UL multiplexing in a slot for each priority before performing intra-priority UE multiplexing, if the derived (LP) PUCCH or (LP) PUSCH does not overlap in time with the semi-static DL symbol, SSB, and coreset#0, and if the derived (LP) PUCCH or (LP) PUSCH does not overlap in time with another HP PUSCH and/or PUCCH, the UE may delay transmission of HARQ-ACK to the corresponding slot. In addition, when the derived (LP) PUCCH or (LP) PUSCH overlaps in time with the other HP PUSCH and/or PUCCH, the UE may defer HARQ-ACK transmission to the corresponding slot if it is determined that the HP PUCCH and/or PUCCH to be transmitted does not overlap with the semi-static DL symbol, SSB, and coreset#0 after UL multiplexing with the corresponding HP PUCCH and/or PUSCH. In some implementations, if it is determined that the HP PUCCH and/or PUSCH to be transmitted after UL multiplexing with the corresponding HP PUCCH and/or PUSCH overlaps with the semi-static DL symbol, SSB, and CORESET #0 due to time overlap between the derived PUCCH or PUSCH and another HP PUSCH and/or PUCCH, the UE may determine whether to defer transmission of the HARQ-ACK to the next slot.
When applying method A4-2, if HARQ-ACKs are discarded without transmission due to overlap in time with another HP PUSCH and/or PUCCH and UL multiplexing with the corresponding HP PUCCH and/or PUSCH (i.e., intra-priority UE multiplexing) (e.g., when one bit HP HARQ-ACK using PUCCH format 0 overlaps in time with LP HARQ-ACK, or when HP SR overlaps in time with LP HARQ-ACK using PUCCH format 2, 3, or 4), the UE may determine that the corresponding slot is not suitable as a target slot/resource (i.e., the corresponding slot is invalid or unavailable), and restart HARQ-ACK deferral operation in the other slot. Alternatively, the UE may stop the deferral operation for the HARQ-ACK that is not transmitted, and may not transmit the corresponding HARQ-ACK.
According to method A4-1, the (earliest) slot including PUCCH or PUSCH for carrying both LP HARQ-ACK and HP HARQ-ACK is determined as the target slot, and thus, the procedure for UE and BS to determine the target slot may be complicated. The target time slot determined according to method A4-1 is more likely to be farther from the initial time slot than the target time slot determined according to method A4-2. A significant time difference between the initial time slot and the target time slot means an increase in delay. Thus, the transmission of the deferred HARQ-ACK based on method A4-1 may be delayed compared to the transmission of the deferred HARQ-ACK based on method A4-2. Delays in the transmission of the HP HARQ-ACK may be undesirable in view of the BS being able to schedule certain transmissions with (higher) priority to allow the transmissions to be performed more quickly. According to the method A4-2, by selecting a slot relatively close to the initial slot as the target slot, there is an advantage in terms of simplifying the process of determining the target slot for deferred HARQ-ACKs and preventing excessive delay. In addition, if the priority (of HARQ-ACK transmission) and the acceptability of HARQ-ACK deferral are provided for each SPS configuration, the UE and the BS need only determine a target slot based on HARQ-ACK information for PDSCH based on SPS configurations that have the same priority and have been configured with HARQ-ACK deferral (hereinafter, such HARQ-ACK information is referred to as SPS HARQ-ACK information). Accordingly, the sizes of the HARQ-ACK transmission and the HARQ-ACK payload considered in determining the target slot may be reduced. This may further simplify the process of determining the target slot for the deferred HARQ-ACK and increase the likelihood of determining an earlier slot as the target slot. Furthermore, in some scenarios, before the overlap between transmissions with different priorities is resolved, the overlap between transmissions with the same priority is resolved first. For a scenario that addresses the overlap between UL transmissions, method A4-2, which determines the target time slot for each priority, may be considered more suitable for consistent system implementation than method A4-1.
In some implementations of the present disclosure, if the deferred HARQ-ACK is AN SPS HARQ-ACK, the PUCCH resource of the "deferred LP and/or HP HARQ-ACK" to be transmitted and considered for UL multiplexing may be AN HP PUCCH, which is determined by the SPS-PUCCH-AN-List in PUCCH-config for HP or the n1PUCCH-AN in SPS-config for HP based on the size of SPS HARQ-ACK bits overlapping in time with the corresponding transmission.
When the "deferred LP and/or HP HARQ-ACKs" have the same priority, i.e., when the included HARQ-ACKs are associated with a single priority, if the deferred HARQ-ACKs are SPS HARQ-ACKs, PUCCH resources of the "deferred LP and/or HP HARQ-ACKs" to be considered in UL multiplexing may be PUCCH resources determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config of the corresponding priority based on the size of the deferred SPS HARQ-ACK bits.
In some implementations of the present disclosure, when there are multiple slots for deferred HARQ-ACK transmission, i.e., when there are multiple candidate target slots, the UE may perform the HARQ-ACK deferral operation using a slot of the multiple slots that starts earlier in time.
Fig. 17 illustrates a flow of HARQ-ACK deferral for transmitting HARQ-ACKs with different priorities, according to some implementations of the present disclosure.
Referring to fig. 17, the ue may determine whether to perform HARQ-ACK deferral for transmission of HARQ-ACK information having different priorities according to some implementations of the present disclosure (S1701). For example, if the scheduled transmission of HP HARQ-ACK information in the initial slot overlaps with a DL symbol (e.g., semi-static DL symbol, SSB, and CORESET#0), the UE may perform HARQ-ACK deferral for the HP HARQ-ACK transmission. If the scheduled transmission of the LP HARQ-ACK information in the initial slot overlaps with a DL symbol (e.g., semi-static DL symbol, SSB, and CORESET#0), the UE may perform HARQ-ACK deferral for the LP HARQ-ACK transmission. The initial time slot for scheduling the HP HARQ-ACK transmission may be the same as or different from the initial time slot for scheduling the LP HARRQ-ACK transmission. The UE may determine a target slot for transmitting the deferred HP HARQ-ACK information and the deferred LP HARQ-ACK information (S1703). For example, the UE may determine the target time slot according to method A4-1 of the present disclosure. Alternatively, the UE may determine the target time slot according to method A4-2 of the present disclosure. The UE may transmit deferred HP HARQ-ACK information and/or deferred LP HARQ-ACK information in the determined target slot (S1705).
BS side
The above-described implementation of the present disclosure will be explained again from the perspective of the BS.
Fig. 18 illustrates an operational flow of a BS according to some implementations of the present disclosure.
In some implementations, the BS may configure the UE with higher layer parameters for determining PUCCH transmissions and their slot formats. The BS may then schedule PDSCH to the UE in DL scheduling DCI or configure/activate SPS PDSCH through higher layer configuration and DCI. The BS may transmit a scheduled (SPS) PDSCH (S1801) and receive a PUCCH in response to the scheduled (SPS) PDSCH. In addition, the BS may defer a specific PUCCH reception based on the indicated or configured PUCCH reception (S1803), and receive the multiplexed UCI through a PUCCH determined based on the deferred PUCCH reception and other PUCCH reception (S1805). For example, the UE may defer a particular PUCCH transmission based on the indicated or configured PUCCH transmission and multiplex the deferred PUCCH transmission with other PUCCH transmissions. The BS may receive a PUCCH or PUSCH expected to be transmitted by the UE based on the UE operation.
< implementation B1> determining availability of PUCCH of HARQ-ACK for SPS PDSCH transmission
When the UE is not allowed to transmit the HARQ-ACK response for the PDSCH received by the UE, the BS may assume that the PDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 corresponding to the HARQ-ACK response is delayed by K1 def So that k1' =k1+k1 def And, therefore, the received PDSCH has a new PDSCH to HARQ-ACK feedback timing K1'. The BS may assume that the UE will use the followingAt least one of the methods determines whether to allow transmission of the HARQ-ACK response.
* Method B1-1: for a particular PUCCH (PUCCH A) carrying HARQ-ACK for SPS PDSCH reception, if a PUCCH carrying HARQ-ACK feedback for SPS PDSCH, which is used when no other PUCCH is assumed in a given slot, satisfies the following condition, it is determined that transmission of PUCCH a is not allowed. For example, such a PUCCH may be a PUCCH for SPS HARQ-ACK transmission determined by PUCCH-config in SPS-PUCCH-AN-List as configuration information for configuring UE-specific PUCCH parameters or n1PUCCH-AN in SPS-config as configuration information for configuring DL semi-persistent transmission based on the size of SPS HARQ-ACK bits transmitted in the corresponding slot.
The above conditions may include when PUCCH a overlaps in time with at least one of the following symbols: semi-static DL symbols (e.g., a set of symbols indicated as DL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); semi-static flexible symbols (e.g., symbol sets not indicated as DL or UL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); SSB symbols (e.g., a set of symbols indicated to the UE by SIB1 or SSB-positioninburst in ServingCellConfigCommon for receiving SS/PBCH blocks); and/or ORESET#0 (e.g., MIB of COESET for Type0-PDCCH CSS set). For example, for a specific SPS HARQ-ACK transmission, if the number of SPS HARQ-ACK bits to be transmitted is X bits without considering other PUCCH scheduling, PUCCH resource a may be selected from SPS-PUCCH-AN-List in RRC configuration PUCCH-config. If one or more symbols occupied by the selected PUCCH resource a are indicated as DL by RRC configured tdd-UL-DL-configuration command, the UE and BS may determine not to allow SPS HARQ-ACK transmission.
In some implementations of method B1-1, the above conditions may be applied to indicate a CC for PUCCH transmission by the BS or to allow all CCs for PUCCH transmission thereon if the CC (e.g. PUCCH cell) on which PUCCH transmission is to be performed is dynamically indicated or if such CC changes for each PUCCH transmission according to a predetermined rule. In other words, if the CC (if any) for PUCCH transmission and all CCs on which PUCCH transmission is allowed are indicated by the BS satisfy the above condition, it may be determined that PUCCH a transmission is not allowed.
* Method B1-2: for a particular PUCCH (PUCCH A) carrying HARQ-ACKs for SPS PDSCH reception, it is determined that PUCCH a's transmission is not allowed if the PUCCH used when multiplexed with other UL transmissions in a given slot is assumed to satisfy the following condition.
The above conditions may include when PUCCH a overlaps in time with at least one of the following symbols: semi-static DL symbols (e.g., a set of symbols indicated as DL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); semi-static flexible symbols (e.g., symbol sets not indicated as DL or UL by tdd-UL-DL-configuration command or tdd-UL-DL-configuration de-configured); SSB symbols (e.g., a set of symbols indicated to the UE by SIB1 or SSB-positioninburst in ServingCellConfigCommon for receiving SS/PBCH blocks); and/or ORESET#0 (e.g., MIB for COESET for the Type0-PDCCH CSS set).
In some implementations of methods B1-2, "other UL transmissions" may be limited to PUCCH transmissions or PUCCH transmissions carrying a particular type of UCI. The specific type of UCI may be HARQ-ACK, HARQ-ACK and SR, or HARQ-ACK and CSI.
Alternatively, in some implementations of methods B1-2, "other UL transmissions" may be limited to semi-statically configured PUCCH transmissions. For example, the term "other UL transmissions" may be limited to SR PUCCH occasions or periodic/quasi-persistent CSI. The reason for this is that the UE needs to make a selection regarding dynamic scheduling up to a specific point in time in order to ensure the processing time of the UE in consideration of PUCCH transmission indicated by dynamic scheduling. Accordingly, if the HARQ-ACK deferral operation is performed in consideration of PUCCH transmission indicated by dynamic scheduling, it may increase complexity of the HARQ-ACK deferral operation and increase implementation difficulty of the UE.
In some implementations of methods B1-2, when performing HARQ-ACK transmission for a dynamically scheduled PDSCH, the UE may expect that the BS will schedule the PDSCH such that HARQ-ACK transmission is always allowed, and then determine that transmission of HARQ-ACK response for the dynamically scheduled PDSCH in the scheduled time slot is feasible. In other words, the method can be adopted by assuming that the BS is always enabled in the corresponding slot through the PUCCH transmission of the dynamic scheduling indication, thereby reducing the implementation difficulty of the UE.
As an example of method B1-2, when the UE intends to transmit multiplexed UCI X bits on one or more overlapping PUCCH resources including SPS HARQ-ACK PUCCH according to the method described in section 9 of 3gpp TS 38.213, the UE may select PUCCH resource a. When one or more symbols occupied by the selected PUCCH resource a are indicated as DL by RRC configured tdd-UL-DL-configuration command, the UE and BS may determine not to allow SPS HARQ-ACK transmission. When it is determined that SPS HARQ-ACK transmission is not allowed, the UE may transmit all or some of the Y bits of the multiplexed UCI X bits on the deferred PUCCH resource. In this case, the Y bits may be SPS HARQ-ACK bits among the X bits.
In some implementations of methods B1-2, the above conditions may be applied to indicate a CC for PUCCH transmission by the BS or to allow all CCs for PUCCH transmission thereon if the CC on which PUCCH transmission is to be performed (i.e. PUCCH cell) is dynamically indicated or if such CC changes for each PUCCH transmission according to a predetermined rule. In other words, if the CC (if any) for PUCCH transmission and all CCs on which PUCCH transmission is allowed are indicated by the BS satisfy the above condition, it may be determined that PUCCH a transmission is not allowed.
< implementation B2> determining PUCCH resources for deferred HARQ-ACKs with UL multiplexing
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the BS may assume that the UE defers the PDSCH corresponding to the HARQ-ACK response to the HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 by K1 def So that k1' =k1+k1 def . In other words, the BS may assume that the UE defers transmission of the corresponding HARQ-ACK response from a time slot of the initial indication/configuration transmission (hereinafter referred to as initial time slot) to another time slot (hereinafter referred to as target time slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. BS canAssuming that the UE will multiplex and transmit UCI including deferred HARQ-ACKs with other UL transmissions in a target slot, the target slot is determined based on HARQ timing obtained from the HARQ deferral. In this case, PUCCH resources for receiving the multiplexed UCI may be selected according to at least one of the following methods. The BS may select a different method according to UCI to be received in the target slot.
* Method B2-1: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot (slot n), the BS may assume that the UE will select PUCCH resources according to the following procedure. The BS may receive deferred UCI on PUCCH resources intended to be selected by the UE within the target slot.
Process B2-1-1. Without considering deferred PUCCH, the UE determines PUCCH resources for transmission considering the number of UCI bits to be transmitted, the indicated PUCCH resource set, the type of UCI to be transmitted, etc. after multiplexing with UL transmission indicated/configured in slot n. In this case, the method in section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
Process B2-1-2 when one or more PUCCH resources determined by process B2-1-1 overlap in time with a deferred PUCCH resource, or when there is a PUCCH carrying HARQ-ACK in the PUCCH resources determined by process B2-1-1, the UE may transmit UCI bits to be transmitted on the corresponding PUCCH resource as well as the deferred UCI bits. Otherwise, the UE independently transmits deferred PUCCH resources. If the deferred HARQ-ACK is AN SPS HARQ-ACK, the "deferred PUCCH resource" may be a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of the deferred SPS HARQ-ACK bits (i.e., the number of deferred SPS HARQ-ACK bits). Alternatively, the "deferred PUCCH resource" may be a PUCCH resource selected to transmit UCI including HARQ-ACK in the initial slot, i.e., a PUCCH resource selected in consideration of UL multiplexing in the initial slot. For example, a PUCCH resource having the same PUCCH resource ID as the PUCCH resource ID selected in consideration of UL multiplexing in the initial slot may be used as the "deferred PUCCH resource". In some implementations, the UE may transmit the deferred UCI bits together on the earlier-starting PUCCH resource when the deferred PUCCH resource and the two or more PUCCH resources determined by procedure B2-1-1 overlap simultaneously in time. The reason for this is to minimize the delay time of the deferred UCI bits. In some implementations, the UE may not desire to transmit the deferred UCI bits together on PUCCH resources carrying UCI having a size less than or equal to two bits. In some implementations, when the UE independently transmits deferred PUCCH resources, the UE may expect the total number of PUCCHs to be transmitted in a target slot including deferred PUCCH resources to be 2 or less. Further, the UE may expect that other PUCCH transmissions in the target slot do not carry HARQ-ACKs.
Process B2-1-3. If the PUCCH resource determined by process B2-1-1 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits given by process B2-1-2 to be transmitted on the corresponding PUCCH resource on the overlapping PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
* Method B2-2: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot, the BS may assume that the UE will select PUCCH resources according to the following procedure. The BS may receive deferred UCI on PUCCH resources that are expected to be selected by the UE within the target slot.
Procedure B2-2-1.Ue determines PUCCH resources for transmission considering the size of UCI bits to be transmitted, the indicated PUCCH resource set, and the type of UCI to be transmitted when the deferred UCI transmission (or PUCCH resource on which the deferred UCI transmission is to be performed) is multiplexed with UL transmission indicated/configured in slot n. In this case, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used. If the deferred HARQ-ACK is AN SPS HARQ-ACK, the PUCCH resource to consider for "deferred UCI transmission" for UL multiplexing may be a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of the deferred SPS HARQ-ACK bit. Alternatively, the PUCCH resource to be considered for the "deferred UCI transmission" of UL multiplexing may be a PUCCH resource selected to transmit the corresponding UCI in the initial slot, i.e., a PUCCH resource selected in consideration of UL multiplexing in the initial slot.
Process B2-2-2. If the PUCCH resource determined by process B2-2-2 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits to be transmitted on the corresponding PUCCH resource on the overlapped PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
* Method B2-3: when the UE defers UCI including HARQ-ACK to be transmitted in the initial slot and transmits the deferred UCI in the target slot, the BS may assume that the UE will select PUCCH resources according to the following procedure. The BS may receive deferred UCI on PUCCH resources that are expected to be selected by the UE within the target slot.
Process B2-3-1 as if there is no deferred PUCCH, the UE determines PUCCH resources for transmission considering the size of UCI bits to be transmitted, the indicated PUCCH resource set, and the type of UCI to be transmitted after multiplexing with UL transmission indicated/configured in slot n. In this case, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
Process B2-3-2 when one or more PUCCH resources determined by process B2-3-1 overlap in time with the deferred SPS HARQ-ACK PUCCH resources, or when there is a PUCCH carrying HARQ-ACK among the PUCCH resources determined by process B2-3-1, the UE transmits deferred UCI bits together on the corresponding resources according to at least one of the following conditions (method B2-3-1). Alternatively, the UE may transmit UCI bits of UL transmission indicated/configured in slot n and deferred UCI bits on PUCCH resources used when the deferred UCI transmission is multiplexed with UL transmission indicated/configured in slot n (method B2-3-2). In some implementations, the UE may select method B2-3-1 if the PUCCH resource a bearer has a UCI with a size greater than two bits. In some implementations, the UE may select method B2-3-2 if the PUCCH resource a bearer has a UCI with a size less than or equal to two bits. In some implementations, if PUCCH resource a is a PUCCH resource determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config, i.e. a PUCCH resource carrying SPS HARQ-ACK only, the UE may select method B2-3-2. When using method B2-3-2, if deferred HARQ-ACK is SPS HARQ-ACK, PUCCH resources to be considered for "deferred UCI transmission" for UL multiplexing may be PUCCH resources determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config based on the size of deferred SPS HARQ-ACK bits. When using method B2-3-2, PUCCH resources to be considered for "deferred UCI transmission" for UL multiplexing may be PUCCH resources selected to transmit the corresponding UCI in the initial slot, i.e., PUCCH resources selected in consideration of UL multiplexing in the initial slot. When the deferred SPS HARQ-ACK PUCCH resource and the two or more PUCCH resources determined by procedure B2-3-1 overlap simultaneously in time, the UE may transmit the deferred UCI bits together on the earlier-starting PUCCH resource. The reason for this is to minimize the delay time of the deferred UCI bits.
Process B2-3-3. If the PUCCH resource determined by process B2-3-1 overlaps in time with the PUSCH transmission, the UE may transmit UCI bits given by process B2-3-2 to be transmitted on the corresponding PUCCH resource on the overlapped PUSCH resource without performing the corresponding PUCCH transmission. To perform this procedure, the method of section 9 of 3GPP TS 38.213 (e.g., section 9 of 3GPP TS 38.213Rel-15 or Rel-16) may be used.
When implementing the implementation B2, the BS may determine an earliest slot or sub-slot including available resources as a target slot for receiving the deferred UCI, instead of selecting resources for receiving the deferred UCI in the determined target slot. That is, the BS may determine a target slot for deferred reception based on the presence of resources for receiving deferred HARQ-ACKs.
< implementation B3> special handling with maximum payload size of PUCCH resource set
When the UE is not allowed to transmit HARQ-ACK response for the received PDSCH, the BS may assume that the UE willPDSCH-to-HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 corresponding to HARQ-ACK response defers K1 def So that k1' =k1+k1 def . In other words, the BS may assume that the UE defers transmission of the corresponding HARQ-ACK response from a time slot (hereinafter referred to as an initial time slot) of the initial indication/configuration transmission to another time slot (hereinafter referred to as a target time slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0. The BS may assume that the UE will multiplex and transmit UCI including deferred HARQ-ACKs with other UL transmissions in a target slot determined based on HARQ timing obtained from the HARQ delay, and then receive UCI and other UL transmissions transmitted from the UE.
The UE and BS may determine PUCCH resources on which to multiplex and transmit the deferred UCI transmission with the UCI of another UL transmission according to implementation A2/B2 or any method similar thereto. When determining PUCCH resources without considering deferred UCI as in method A2-1/B2-1 implementing embodiment A2/B2, the maximum UCI bit size (e.g., maximum payload size maxPayloadSize) configured for the determined PUCCH resources or PUCCH resource set including the determined PUCCH resources may become smaller than the number of UCI bits including the actual transmission of deferred UCI. In this case, the following method can be considered.
* Method B3-1: the entire deferred UCI may not be received. In this case, if the BS determines PUCCH resources in consideration of the deferred UCI (e.g., if the BS selects a PUCCH resource set in consideration of the deferred UCI), the BS may determine PUCCH resources again by excluding the deferred UCI.
* Method B3-2: some portions of the deferred UCI may not be received. In this case, the following method can be considered.
* Method B3-2-1: the BS may assume that the UE will transmit the deferred UCI by excluding CSI (if any) included in the deferred UCI until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size, and then receive the deferred UCI.
* Method B3-2-2: the BS may assume that the UE will transmit the deferred UCI by excluding SRs (if any) included in the deferred UCI until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size, and then receive the deferred UCI.
* Method B3-2-3: the BS may assume that the UE will transmit the deferred UCI by excluding HARQ-ACKs (if any) included in the deferred UCI until UCI bits to be transmitted including the deferred UCI become smaller than the maximum UCI bit size, and then receive the deferred UCI. In this case, it is assumed that each HARQ-ACK bit is sequentially excluded according to the transmission timing of the PDSCH associated with the corresponding HARQ-ACK bit. To ensure maximum delay for PDSCH supported services, it may be assumed that HARQ-ACKs associated with the most recently transmitted PDSCH are excluded first. Alternatively, the HARQ-ACK associated with the earliest transmitted PDSCH may be excluded first to allow the UE to receive the PDSCH with the shortest delay. Excluding HARQ-ACKs associated with PDSCH of the earliest transmission from transmission enables dropping HARQ-ACK transmissions for PDSCH reception beyond maximum latency and reduces latency of meaningful transmissions.
* Method B3-2: the BS may assume that the UE will perform bit bundling at regular intervals (e.g., every two bits) to transmit HARQ-ACKs in the deferred UCI or to transmit HARQ-ACKs in UCI transmitted with the deferred UCI.
* Method B3-3: the BS may assume that the UE will not perform transmission on the corresponding PUCCH resource. Alternatively, the BS may perform scheduling such that UCI bits including deferred UCI to be received do not exceed a maximum UCI bit size (e.g., maxPayloadSize) configured for the PUCCH resource set.
< implementation B4> processing with/without inter-UE multiplexing between different priorities
When the UE is not allowed to transmit the HARQ-ACK response for the received PDSCH, the BS may assume that the UE defers the PDSCH corresponding to the HARQ-ACK response to the HARQ-ACK feedback timing (hereinafter referred to as HARQ timing) K1 by K1 def So that k1' =k1+k1 def . In other words, the BS may assume that the UE defers transmission of the corresponding HARQ-ACK response from a time slot of the initial indication/configuration transmission (hereinafter referred to as an initial time slot) to another time slot(hereinafter referred to as target slot) such that the received PDSCH has a new PDSCH-to-HARQ-ACK feedback timing K1', where K1 def May be an integer greater than 0.
For example, the BS may assume that the UE will multiplex and transmit UCI including deferred HARQ-ACKs with another UL transmission in a target slot determined based on HARQ timing obtained from the HARQ deferral. As another example, if transmission of UCI including deferred HARQ-ACK is allowed in a specific slot or if transmission of deferred HARQ-ACK is allowed in a specific slot even though transmission of UCI including deferred HARQ-ACK is multiplexed with another UL transmission in a specific slot, the BS may assume that the UE will determine the earliest of these slots as a target slot and then multiplex and transmit UCI including deferred HARQ-ACK with another UL transmission in the determined target slot.
When the UE supports UL multiplexing between different priorities (i.e., inter-priority intra-UE multiplexing) and is thus able to transmit UCI and/or UL-SCH scheduled by different HARQ-ACK codebook priorities or different priority indicators on a single PUCCH and/or PUSCH resource, and when the UE is allowed to perform HARQ-ACK deferral operations, the UE and BS may first consider the following.
1) Case 1: when transmission of PUCCH on which HP UCI and LP UCI are not allowed to be multiplexed, if one of UCI includes HARQ-ACK bit for which HARQ-ACK deferral operation is configured, then
* Method B4a-1: the BS and the UE may perform the deferral operation regardless of the priority of the HARQ-ACK bit for which the deferral operation is configured.
* Method B4a-2: the BS and the UE may perform the deferral operation only on the HP HARQ-ACK bit among the HARQ-ACK bits configured with the deferral operation.
* Method B4a-3: the BS and the UE may perform the deferral operation only on LP HARQ-ACK bits among HARQ-ACK bits configured with the deferral operation.
* Method B4a-4: the BS and the UE may perform deferral operation only on HARQ-ACK bits having the same priority as a PUCCH (e.g., HP PUCCH) on which HP UCI and LP UCI are multiplexed among HARQ-ACK bits for which deferral operation is configured.
* Method B4a-5: before intra-priority UE multiplexing, the BS and the UE may determine whether to perform deferral operation based on the PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method B4a-5-1: before intra-priority UE multiplexing, if the BS and UE determine not to allow transmission of PUCCH carrying HARQ-ACK bits for which deferral operation is configured for: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the BS and UE may perform deferral operations on the corresponding HARQ-ACK bits.
* Methods B4a-6: the BS and the UE may perform the deferral operation only when at least one HARQ-ACK bit for which the deferral operation is configured is included in each of the HP UCI and the LP UCI.
* Method B4a-7: the BS and the UE do not perform deferral operations.
In some implementations, these methods (e.g., methods B4a-1 through B4 a-7) may be limited to the case where the PUCCH on which HP and LP HARQ-ACKs are multiplexed is derived from PUCCH resources for SPS HARQ-ACK transmission (e.g., PUCCH resources or PUCCH resource sets configured by parameter n1PUCCH or parameter SPS-PUCCH-AN-List-r 16).
In some implementations, these operations (e.g., methods B4a-1 through B4 a-7) may be limited to the case where the PUCCH on which HP and LP HARQ-ACKs are multiplexed is an HP PUCCH. In other words, the corresponding PUCCH may be a PUCCH resource set to HP or a resource for HARQ-ACK codebook indicated as HP.
In some implementations, when method B4a-5 is applied, method B4a-5 may be combined with method B4a-1/B4a-2/B4a-3/B4 a-4. For example, when combining the methods B4a-2 and B4a-5, the BS and the UE may determine whether to perform a deferral operation on the HP HARQ-ACK bit according to the methods B4a-5 and may not perform a deferral operation on the LP HARQ-ACK bit. As another example, when combining the methods B4a-4 and B4a-5, the BS and the UE may determine whether to perform deferral operation on HARQ-ACK bits of the same priority as a PUCCH (e.g., HP PUCCH) on which HP UCI and LP UCI are multiplexed according to the method A4a-5, and may not perform deferral operation on HARQ-ACK bits of different priorities.
2) Case 2: when transmission of PUSCH on which HP and LP HARQ-ACKs are not allowed to be multiplexed,
* Method B4B-1: the BS and the UE do not perform deferral operations.
* Method B4B-2: before intra-priority UE multiplexing, the BS and the UE may determine whether to perform deferral operation based on the PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method B4B-2-1: before intra-priority UE multiplexing, if the BS and UE determine not to allow transmission of PUCCH carrying HARQ-ACK bits for which deferral operation is configured for: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the BS and UE may perform deferral operations on the corresponding HARQ-ACK bits.
These operations may be limited to the case where the PUSCH on which the HP and LP HARQ-ACKs are multiplexed is the HP PUSCH. In other words, the corresponding PUSCH may be a PUSCH resource set as HP or a PUSCH resource indicated as HP.
3) Case 3: when the HP PUCCH or HP PUSCH is prioritized and transmitted, but the LP PUCCH or LP PUSCH and the LP UCI are not prioritized, and thus are not transmitted after the procedure for multiplexing the HP PUCCH or HP PUCCH and the LP PUCCH or LP PUSCH, if the LP UCI includes HARQ-ACK bits for which the HARQ-ACK deferral operation is configured, then
* Method B4c-1: the BS and UE do not perform deferral operations (for the untransmitted LP UCI and LP PUCCH/PUSCH).
* Method B4c-2: before intra-priority UE multiplexing, the BS and the UE may determine whether to perform deferral operation based on the PUCCH to perform UL multiplexing for each priority. For example, at least one of the following methods may be considered.
* Method B4c-2-1: before intra-priority UE multiplexing, if the BS and UE determine not to allow transmission of PUCCH carrying HARQ-ACK bits for which deferral operation is configured for: the PUCCH is a PUCCH resource configured by a parameter n1PUCCH or a parameter SPS-PUCCH-AN-List-r 16; and the PUCCH overlaps in time with the semi-static DL symbol, SSB, and CORESET #0, the BS and UE may perform deferral operations on the corresponding HARQ-ACK bits.
When performing HARQ-ACK deferral operations on LP HARQ-ACKs and/or HP HARQ-ACKs, there may be a problem as to how to determine the earliest target time slot/resource of deferred LP HARQ-ACKs and/or deferred HP HARQ-ACKs.
In some implementations of the present disclosure, when the LP HARQ-ACK and/or the HP HARQ-ACK are subject to deferral operations, the BS and the UE may determine target slots/resources for the HARQ-ACK deferral operations in consideration of the following methods.
* Method B4-1: the UE/BS may defer HARQ-ACK transmission/reception to a slot or sub-slot including PUSCH and/or PUCCH for carrying both deferred LP HARQ-ACK and/or deferred HP HARQ-ACK.
Referring to fig. 16 (a), when HP HARQ-ACK X1 and LP HARQ-ACK X2 in an initial slot (slot m) undergo HARQ-ACK deferral according to a predetermined or predefined condition, if PUSCH and/or PUCCH for carrying all deferrals X1 and X2 scheduled for transmission in slot m+1 and HP HAR-ACK Y1 exist in slot m+1, where slot m+1 is immediately adjacent to slot m, the BS may determine slot m+1 as a target slot. Otherwise, the BS may determine whether deferred X1 and X2 and Y1 can be received together in slot m+2. If there is another HARQ-ACK scheduled to be received in slot m+2, then the other HARQ-ACK may also be considered with X1, X2, and Y1 in determining whether slot m+2 is used as the target slot.
In method B4-1, PUSCH and/or PUCCH resources determined by the inter-priority UE intra-multiplexing procedure may be used to determine PUSCH and/or PUCCH resources for transmitting both LP HARQ-ACKs and/or HP HARQ-ACKs. For example, even when a PUCCH resource set of HP UCI scheduled by the BS for the UE in slot n is used to multiplex the scheduled HP UCI with deferred HARQ-ACK, the BS may delay the reception of HARQ-ACK from the UE to slot n if UL resources are allowed to transmit. As another example, if the available LP/HP PUSCH resources scheduled by the BS in slot n overlap with PUCCH resources for or multiplexed with deferred HARQ-ACKs, the BS may delay the reception of HARQ-ACKs from the UE to slot n.
* Method B4-2: the BS and the UE perform a HARQ-ACK deferral operation for the LP HARQ-ACK to be deferred and/or the HP HARQ-ACK to be deferred for each priority. For example, considering the priority of deferred HARQ-ACKs, the BS may defer reception of HARQ-ACKs having the same priority to a slot or sub-slot including PUSCH and/or PUCCH for carrying all HARQ-ACKs having the corresponding priority. According to method B4-2, the LP HARQ-ACK and the HP HARQ-ACK may be deferred to different time slots.
For example, when the HP HARQ-ACK X1 and the LP HARQ-ACK X2 in the initial time slot (time slot m) experience HARQ-ACK deferral according to a predetermined or predefined condition, the BS may determine a target time slot/target resource for each priority. Referring to 16 (b), for HP, if PUSCH and/or PUCCH for receiving both X1, which is a subject of HARQ-ACK deferral, and HP HARQ-ACK Y1 scheduled for transmission in slot m+1 exist in slot m+1, where slot m+1 is adjacent to slot m, the BS may determine slot m+1 as a target slot for receiving X1 and Y2. Otherwise, the BS may determine whether deferred X1 and Y1 can be received together in the next slot (slot m+2). If there is another HP HARQ-ACK scheduled to be received in slot m+2, then another UCI may also be considered with X1 and Y1 in determining whether slot m+2 is used as the target slot for receiving HP HARQ-ACK. Referring to fig. 16 (b), for LP, if PUSCH and/or PUCCH for receiving X2, which is a subject of HARQ-ACK deferral, exists in a slot m+1, wherein the slot m+1 is immediately adjacent to the slot m, the BS may determine the slot m+1 as a target slot for transmission of X2. Otherwise, the BS may determine whether deferred X2 can be transmitted in the next slot (slot m+2). If there is another LP HARQ-ACK, LP HARQ-ACK Y2, scheduled to be received in slot m+2, then another UCI, UCI Y2, may also be considered with X2 in determining whether slot m+2 is used as the target slot for receiving LP HARQ-ACK.
* Method B4-2-1: in some implementations, the BS and UE may override inter-priority UE intra-multiplexing in determining PUSCH and/or PUCCH for carrying all HARQ-ACKs of the same priority. For example, when UL multiplexing is performed in a slot for each priority before intra-priority UE multiplexing, if the derived PUCCH or PUSCH does not overlap in time with semi-static DL symbols, SSB, and CORESET #0, the BS may defer HARQ-ACK reception to the corresponding slot.
In some implementations of method B4-2-1, when the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and the PUCCH or PUSCH derived for the deferred LP HARQ-ACK overlap each other in time within the same time slot, if the UE is not configured to perform UCI multiplexing for different priorities, the UE may receive the deferred HP HARQ-ACK through the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and discard the transmission of the deferred LP HARQ-ACK. In some other implementations of method A4-2-1, when the PUCCH or PUSCH derived for the deferred HP HARQ-ACK and the PUCCH or PUSCH derived for the deferred LP HARQ-ACK overlap each other in time within the same time slot, if the UE is configured to perform UCI multiplexing for different priorities, the UE may determine the PUCCH or PUSCH for multiplexing the deferred HP HARQ-ACK and the deferred LP HARQ-ACK in the time slot and then receive the deferred HP HARQ-ACK and the deferred LP HARQ-ACK through the determined PUCCH or PUSCH. In some implementations, if the determined PUCCH or PUSCH overlaps in time with the semi-static DL symbols, SSB, and CORESET #0 in the slot, the BS may discard or skip receiving the deferred HP HARQ-ACK and the deferred LP HARQ-ACK.
* Method B4-2-2: in some implementations, the BS and UE may consider inter-priority UE intra-multiplexing in determining PUSCH and/or PUCCH for carrying all HARQ-ACKs of the same priority. For example, when the UE performs UL multiplexing in a slot for each priority before performing intra-priority UE multiplexing, if the derived PUCCH or PUSCH does not overlap in time with semi-static DL symbols, SSB, and CORESET #0, and if the derived PUCCH or PUSCH does not overlap in time with another HP PUSCH and/or PUCCH, the BS may assume that the UE defers HARQ-ACK transmission to the corresponding slot. In addition, when the derived PUCCH or PUSCH overlaps in time with another HP PUSCH and/or PUCCH, if it is determined that HP PUCCH and/or PUCCH to be transmitted does not overlap with semi-static DL symbols, SSB, and coreset#0 after UL multiplexing with the corresponding HP PUCCH and/or PUSCH, the BS may assume that the UE defers HARQ-ACK transmission to the corresponding slot. In some implementations, if it is determined that HP PUCCHs and/or PUSCHs to be transmitted after UL multiplexing with corresponding HP PUCCHs and/or PUSCHs overlap with semi-static DL symbols, SSBs, and CORESET #0 due to temporal overlap between derived PUCCHs or PUSCHs and other HP PUCCHs and/or PUCCHs, the BS may determine whether to defer reception of HARQ-ACKs to the next slot.
When applying method B4-2, if HARQ-ACKs are discarded without receiving HARQ-ACKs due to time overlap with another HP PUSCH and/or PUCCH and UL multiplexing with the corresponding HP PUCCH and/or PUSCH (e.g., inter-priority UE intra-multiplexing) (e.g., when one bit HP HARQ-ACK using PUCCH format 0 overlaps in time with LP HARQ-ACKs or when HP SRs overlap in time with LP HARQ-ACKs using PUCCH formats 2, 3, or 4), the BS may assume that the UE will determine that the corresponding slot is unsuitable as a target slot/resource (i.e., the corresponding slot is invalid or unavailable) and resume HARQ-ACK deferral operation in the other slot. Alternatively, the BS may assume that the UE will stop deferral operations for HARQ-ACKs that are not transmitted and will not transmit the corresponding HARQ-ACKs.
In some implementations of the present disclosure, if the deferred HARQ-ACK is AN SPS HARQ-ACK, the PUCCH resource to receive and consider for UL multiplexing the "deferred LP and/or HP HARQ-ACK" may be AN HP PUCCH determined by SPS-PUCCH-AN-List in PUCCH-config for HP or n1PUCCH-AN in SPS-config for HP based on the size of SPS HARQ-ACK bits overlapping in time.
When the "deferred LP and/or HP HARQ-ACKs" have the same priority, i.e., when the included HARQ-ACKs are associated with a single priority, if the deferred HARQ-ACKs are SPS HARQ-ACKs, PUCCH resources of the "deferred LP and/or HP HARQ-ACKs" to be considered in UL multiplexing may be PUCCH resources determined by SPS-PUCCH-AN-List in PUCCH-config or n1PUCCH-AN in SPS-config of the corresponding priority based on the size of the deferred SPS HARQ-ACK bits.
In some implementations of the present disclosure, when there are a plurality of slots for deferring HARQ-ACK transmission, i.e., when there are a plurality of candidate target slots, the BS may perform the HARQ-ACK deferral operation using a slot starting earlier in time among the plurality of slots.
Fig. 19 illustrates a flow of HARQ-ACK deferral for receiving HARQ-ACKs with different priorities, according to some implementations of the present disclosure.
Referring to fig. 19, the bs may determine whether to perform HARQ-ACK deferral to receive HARQ-ACK information having different priorities according to some implementations of the present disclosure (S1901). For example, if the scheduled reception of the HP HARQ-ACK information overlaps with a DL symbol in the initial slot (e.g., semi-static DL symbol, SSB, and CORESET#0), the BS may perform HARQ-ACK deferral for the HP HARQ-ACK transmission. If the scheduled reception of the LP HARQ-ACK information overlaps with DL symbols (e.g., semi-static DL symbols, SSB, and CORESET#0) in the initial slot, the BS may perform HARQ-ACK deferral for LP HARQ-ACK reception. The initial time slot for scheduling HP HARQ-ACK reception may be the same as or different from the initial time slot for scheduling LP HARRQ-ACK reception. The BS may determine a target slot for receiving the deferred HP HARQ-ACK information and the deferred LP HARQ-ACK information (S1903). For example, the BS may determine the target slot according to method A4-1 of the present disclosure. Alternatively, the BS may determine the target slot according to method A4-2 of the present disclosure. The BS may receive deferred HP HARQ-ACK information and/or deferred LP HARQ-ACK information in the determined target slot (S1905).
In some implementations of the disclosure, the BS may provide higher layer parameters for determining PUCCH transmissions and their slot formats to the UE through RRC configuration. The BS may schedule PDSCH to the UE in DL scheduling DCI or configure SPS PDSCH to the UE through higher layer configuration and DL scheduling DCI. The BS may then transmit the scheduled PDSCH. The UE may transmit a PUCCH to the BS in response to the PDSCH. In addition, the UE may defer a specific PUCCH transmission based on a PUCCH transmission indicated or configured by the BS and multiplex the deferred PUCCH transmission with other PUCCH transmissions. The BS may receive a PUCCH or PUSCH expected to be transmitted by the UE based on the UE operation.
According to some implementations of the present disclosure, the UE may determine whether HARQ-ACK PUCCH resources for transmission are available. If the HARQ-ACK PUCCH resource is not available, the UE may transmit the corresponding PUCCH in the next available slot. In some implementations of the disclosure, the UE may defer PUCCH transmission based on the BS's configuration, and the BS may accurately predict the operation of the UE without ambiguity and perform successful PUCCH or PUSCH reception. According to some implementations of the present disclosure, HARQ-ACK deferral may be applied to HARQ-ACK PUCCHs of different priorities, and slots for HARQ-ACK transmissions of different priorities may be determined.
The UE may perform operations associated with the transmission of HARQ-ACK information according to some implementations of the present disclosure. The UE may include: at least one transceiver; at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing device for the UE may include: at least one processor; and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer-readable storage medium may store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.
For a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: determining HARQ-ACK deferral for HARQ-ACK information having different priorities; and determining a target slot for transmitting deferred HARQ-ACK information for each priority. For example, for a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority; receiving a first PDSCH based on the first scheduling information; receiving a second PDSCH based on the second scheduling information; generating first HARQ-ACK information having the first priority based on receiving the first PDSCH; generating second HARQ-ACK information having the second priority based on receiving the second PDSCH; determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and delaying transmission of the second HARQ-ACK information having the second priority to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In some implementations, each of the first PDSCH and the second PDSCH may be SPS-based PDSCH.
In some implementations, the operations may include determining an earliest time slot for HARQ-ACK information having a first priority including the first HARQ-ACK information that does not overlap DL symbols as a third time slot.
In some implementations, the first physical UL channel may be a PUCCH for SPS configuration associated with the first PDSCH.
In some implementations, the operations may include: determining a third physical UL channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being identical to the fourth time slot; and transmitting the first HARQ-ACK information and the second HARQ-ACK information on the third physical UL channel in the third slot based on the third physical UL channel not overlapping the DL symbols.
In some implementations, the third physical UL channel may be determined based on the number of bits in the first and second HARQ-ACK information and the PUCCH configuration for the second priority.
In some implementations, the operations may include determining an earliest time slot in which a first physical UL channel for HARQ-ACK information having a first priority including first HARQ-ACK information does not overlap DL symbols and the first physical UL channel does not overlap in time with a second physical UL channel having a second priority as a third time slot.
The BS may perform operations regarding HARQ-ACK reception according to some implementations of the present disclosure. The BS may include: at least one transceiver; at least one processor; and at least one computer memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The processing means for the BS may include: at least one processor; and at least one computer memory operatively connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer-readable (non-transitory) storage medium may store at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations according to some implementations of the present disclosure. The computer program or computer program product may include instructions stored on at least one computer-readable (non-volatile) storage medium and which, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure.
For a BS, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: determining HARQ-ACK deferral for HARQ-ACK information having different priorities; and determining a target slot for receiving deferred HARQ-ACK information for each priority. For example, for a UE, a processing device, a computer-readable (non-transitory) storage medium, and/or a computer program product, operations may include: transmitting first scheduling information related to a first priority and second scheduling information related to a second priority to the UE, wherein the second priority is higher than the first priority; transmitting a first PDSCH to the UE based on the first scheduling information; transmitting a second PDSCH to the UE based on the second scheduling information; determining a first slot for receiving first HARQ-ACK information for the first PDSCH having the first priority based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH; determining a second slot for receiving second HARQ-ACK information for the second PDSCH having the second priority based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH; deferring receipt of the first HARQ-ACK information having the first priority to a third slot based on receipt of the first HARQ-ACK information overlapping DL symbols in the first slot, wherein the third slot is later in time than the first slot; and delaying reception of the second HARQ-ACK information having the second priority to a fourth time slot based on the reception of the second HARQ-ACK information overlapping DL symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
In some implementations, each of the first PDSCH and the second PDSCH may be SPS-based PDSCH.
In some implementations, the operations may include: the earliest time slot for which the first physical UL channel including the first HARQ-ACK information having the first priority does not overlap with the DL symbol is determined as the third time slot.
In some implementations, the first physical UL channel may be a PUCCH for SPS configuration associated with the first PDSCH.
In some implementations, the operations may include: determining a third physical UL channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being the same as the fourth time slot; and receiving the first HARQ-ACK information and the second HARQ-ACK information on a third physical UL channel in the third slot based on the third physical UL channel not overlapping DL symbols.
In some implementations, the third physical UL channel may be determined based on the number of bits in the first and second HARQ-ACK information and a PUCCH configuration for the second priority.
In some implementations, the operations may include determining an earliest time slot in which a first physical UL channel for HARQ-ACK information having a first priority including first HARQ-ACK information does not overlap DL symbols and the first physical UL channel does not overlap in time with a second physical UL channel having the second priority as a third time slot.
Examples of the disclosure as described above have been presented to enable one of ordinary skill in the art to make and practice the disclosure. Although the present disclosure has been described with reference to examples, various modifications and changes may be made by those skilled in the art in the examples of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples set forth herein but is to be accorded the widest scope consistent with the principles and features disclosed herein.
INDUSTRIAL APPLICABILITY
Implementations of the present disclosure may be used in a BS, a UE, or other device in a wireless communication system.
Claims (19)
1. A method of transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) information by a User Equipment (UE) in a wireless communication system, the method comprising:
receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information;
receiving a second PDSCH based on the second scheduling information;
generating first HARQ-ACK information having the first priority based on receiving the first PDSCH;
generating second HARQ-ACK information having the second priority based on receiving the second PDSCH;
Determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
the transmission of the second HARQ-ACK information with the second priority is deferred to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
2. The method of claim 1, wherein each of the first PDSCH and the second PDSCH is a PDSCH based on semi-persistent scheduling.
3. The method according to claim 1, comprising:
the earliest time slot in which the first physical uplink channel including the first HARQ-ACK information for the HARQ-ACK information having the first priority is not overlapped with a downlink symbol is determined as the third time slot.
4. The method of claim 3, wherein the first physical uplink channel is a Physical Uplink Control Channel (PUCCH) for a semi-persistent scheduling configuration related to the first PDSCH.
5. A method according to claim 3, comprising:
determining a third physical uplink channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being the same as the fourth time slot; and
the first HARQ-ACK information and the second HARQ-ACK information are transmitted on the third physical uplink channel in the third time slot based on the third physical uplink channel not overlapping downlink symbols.
6. The method of claim 5, wherein the third physical uplink channel is determined based on a number of bits in the first and second HARQ-ACK information and a Physical Uplink Control Channel (PUCCH) configuration for the second priority.
7. The method according to claim 1, comprising:
the earliest time slot in which a first physical uplink channel including the first HARQ-ACK information for HARQ-ACK information having the first priority does not overlap downlink symbols and the first physical uplink channel does not overlap in time with a second physical uplink channel having the second priority is determined as the third time slot.
8. A User Equipment (UE) configured to transmit hybrid automatic repeat request acknowledgement (HARQ-ACK) information in a wireless communication system, the UE comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information;
receiving a second PDSCH based on the second scheduling information;
generating first HARQ-ACK information having the first priority based on receiving the first PDSCH;
generating second HARQ-ACK information having the second priority based on receiving the second PDSCH;
determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
Determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
the transmission of the second HARQ-ACK information with the second priority is deferred to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
9. A processing apparatus in a wireless communication system, the processing apparatus comprising:
at least one processor; and
at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:
receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
Receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information;
receiving a second PDSCH based on the second scheduling information;
generating first hybrid automatic repeat request acknowledgement (HARQ-ACK) information having the first priority based on receiving the first PDSCH;
generating second HARQ-ACK information having the second priority based on receiving the second PDSCH;
determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
the transmission of the second HARQ-ACK information with the second priority is deferred to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
10. A computer-readable storage medium configured to store at least one program code including instructions that, when executed, cause at least one processor to perform operations comprising:
receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information;
receiving a second PDSCH based on the second scheduling information;
generating first hybrid automatic repeat request acknowledgement (HARQ-ACK) information having the first priority based on receiving the first PDSCH;
generating second HARQ-ACK information having the second priority based on receiving the second PDSCH;
determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
The transmission of the second HARQ-ACK information with the second priority is deferred to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
11. A computer program stored in a computer readable storage medium, the computer program comprising:
receiving first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
receiving a first Physical Downlink Shared Channel (PDSCH) based on the first scheduling information;
receiving a second PDSCH based on the second scheduling information;
generating first hybrid automatic repeat request acknowledgement (HARQ-ACK) information having the first priority based on receiving the first PDSCH;
generating second HARQ-ACK information having the second priority based on receiving the second PDSCH;
determining a first slot for transmitting the first HARQ-ACK information based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
determining a second slot for transmitting the second HARQ-ACK information based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
Delaying transmission of the first HARQ-ACK information having the first priority to a third time slot based on the transmission of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
the transmission of the second HARQ-ACK information with the second priority is deferred to a fourth time slot based on the transmission of the second HARQ-ACK information overlapping downlink symbols in the second time slot, wherein the fourth time slot is later in time than the second time slot.
12. A method of receiving hybrid automatic repeat request acknowledgement (HARQ-ACK) information from a User Equipment (UE) by a Base Station (BS) in a wireless communication system, the method comprising:
transmitting first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
transmitting a first Physical Downlink Shared Channel (PDSCH) to the UE based on the first scheduling information;
transmitting a second PDSCH to the UE based on the second scheduling information;
determining a first slot for receiving first HARQ-ACK information for the first PDSCH having the first priority based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
Determining a second slot for receiving second HARQ-ACK information for the second PDSCH having the second priority based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
delaying reception of the first HARQ-ACK information having the first priority to a third time slot based on the reception of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
based on the reception of the second HARQ-ACK information overlapping with downlink symbols in the second time slot, the reception of the second HARQ-ACK information having the second priority is deferred to a fourth time slot, wherein the fourth time slot is later in time than the second time slot.
13. The method of claim 12, wherein each of the first PDSCH and the second PDSCH is a PDSCH based on semi-persistent scheduling.
14. The method of claim 12, comprising:
the earliest time slot including the first HARQ-ACK information for which the first physical uplink channel with the first priority does not overlap with downlink symbols is determined as the third time slot.
15. The method of claim 14, wherein the first physical uplink channel is a Physical Uplink Control Channel (PUCCH) for a semi-persistent scheduling configuration related to the first PDSCH.
16. The method of claim 14, comprising:
determining a third physical uplink channel for multiplexing the first HARQ-ACK information and the second HARQ-ACK information based on the third time slot being the same as the fourth time slot; and
the first HARQ-ACK information and the second HARQ-ACK information are received on the third physical uplink channel in the third time slot based on the third physical uplink channel not overlapping downlink symbols.
17. The method of claim 16, wherein the third physical uplink channel is determined based on a number of bits in the first and second HARQ-ACK information and a Physical Uplink Control Channel (PUCCH) configuration for the second priority.
18. The method of claim 12, comprising:
the earliest time slot in which a first physical uplink channel including the first HARQ-ACK information for HARQ-ACK information having the first priority does not overlap downlink symbols and the first physical uplink channel does not overlap in time with a second physical uplink channel having the second priority is determined as the third time slot.
19. A Base Station (BS) configured to receive hybrid automatic repeat request acknowledgement (HARQ-ACK) information from a User Equipment (UE) in a wireless communication system, the BS comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connected to the at least one processor and configured to store instructions that, when executed, cause the at least one processor to perform operations comprising:
transmitting first scheduling information related to a first priority and second scheduling information related to a second priority, wherein the second priority is higher than the first priority;
transmitting a first Physical Downlink Shared Channel (PDSCH) to the UE based on the first scheduling information;
transmitting a second PDSCH to the UE based on the second scheduling information;
determining a first slot for receiving first HARQ-ACK information for the first PDSCH having the first priority based on a first PDSCH to HARQ-ack_feedback timing value for the first PDSCH;
determining a second slot for receiving second HARQ-ACK information for the second PDSCH having the second priority based on a second PDSCH to HARQ-ack_feedback timing value for the second PDSCH;
Delaying reception of the first HARQ-ACK information having the first priority to a third time slot based on the reception of the first HARQ-ACK information overlapping downlink symbols in the first time slot, wherein the third time slot is later in time than the first time slot; and
based on the reception of the second HARQ-ACK information overlapping with downlink symbols in the second time slot, the reception of the second HARQ-ACK information having the second priority is deferred to a fourth time slot, wherein the fourth time slot is later in time than the second time slot.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2021-0044319 | 2021-04-05 | ||
| KR10-2021-0151684 | 2021-11-05 | ||
| US202263312375P | 2022-02-21 | 2022-02-21 | |
| US63/312,375 | 2022-02-21 | ||
| PCT/KR2022/004850 WO2022215998A1 (en) | 2021-04-05 | 2022-04-05 | Method for transmitting harq-ack information, user equipment, processing device, storage medium and computer program, and harq-ack information reception method and base station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117121411A true CN117121411A (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280025383.0A Pending CN117121411A (en) | 2021-04-05 | 2022-04-05 | Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, HARQ-ACK information receiving method, and base station |
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| Country | Link |
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| CN (1) | CN117121411A (en) |
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