CN117121594A - Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, and method and base station for receiving HARQ-ACK information - Google Patents
Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, and method and base station for receiving HARQ-ACK information Download PDFInfo
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Abstract
A UE may: performing PDSCH reception in a plurality of cells including a primary cell and a secondary cell configured for PUCCH cell handover; determining a time slot (n+k) on the primary cell based on a HARQ-ACK feedback timing value K for PDSCH reception determined in a set of HARQ-ACK feedback timing values configured for the primary cell and a last time slot n overlapping PDSCH reception among time slots of the primary cell; and transmitting the HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for PDSCH reception using the secondary cell according to PUCCH cell switching. The slot m may be a slot including the start of the slot (n+k) among slots on the secondary cell overlapping the slot (n+k).
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.
When there are a plurality of Physical Uplink Control Channel (PUCCH) cells each configured with PUCCH, it is preferable to adjust PUCCH cells used by the UE to perform PUCCH transmission.
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
According to an aspect of the present disclosure, there is provided herein a method of transmitting hybrid automatic repeat request (HARQ) Acknowledgement (ACK) (HARQ-ACK) information by a user equipment in a wireless communication system. The method may comprise the steps of: performing Physical Downlink Shared Channel (PDSCH) reception in a plurality of cells including a primary cell and including a secondary cell configured for Physical Uplink Control Channel (PUCCH) cell handover; determining a HARQ-ACK feedback timing value K for PDSCH reception from among a set of HARQ-ACK feedback timing values configured for a primary cell between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a user equipment for transmitting HARQ-ACK information in a wireless communication system is provided herein. The user equipment includes: 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. The operations may include: performing PDSCH reception in a plurality of cells including a primary cell and including a secondary cell configured for PUCCH cell switching; determining a HARQ-ACK feedback timing value K for PDSCH reception from among a set of HARQ-ACK feedback timing values configured for a primary cell between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a processing apparatus in a wireless communication system is provided herein. The processing device comprises: 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. The operations may include: performing PDSCH reception in a plurality of cells including a primary cell and including a secondary cell configured for PUCCH cell switching; determining a HARQ-ACK feedback timing value K for PDSCH reception from among a set of HARQ-ACK feedback timing values configured for a primary cell between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a computer-readable storage medium is provided herein. The computer-readable storage medium stores at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations. The operations may include: performing PDSCH reception in a plurality of cells including a primary cell and including a secondary cell configured for PUCCH cell switching; determining a HARQ-ACK feedback timing value K for PDSCH reception from among a set of HARQ-ACK feedback timing values configured for a primary cell between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a computer program stored in a computer readable storage medium is provided herein. The computer program includes at least one program code including instructions that, when executed, cause at least one processor to perform operations. The operations may include: performing PDSCH reception in a plurality of cells including a primary cell and including a secondary cell configured for PUCCH cell switching; determining a HARQ-ACK feedback timing value K for PDSCH reception from among a set of HARQ-ACK feedback timing values configured for a primary cell between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a method of receiving HARQ-ACK information by a base station in a wireless communication system is provided herein. The method may comprise the steps of: performing PDSCH transmission in a plurality of cells including a primary cell for a user equipment and including a secondary cell configured for PUCCH cell switching by the user equipment; determining an HARQ-ACK feedback timing value K for PDSCH transmission among a set of HARQ-ACK feedback timing values for a primary cell configured between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH transmission and a HARQ-ACK feedback timing value K among time slots of the primary cell; and receiving HARQ-ACK information for PDSCH transmission in a slot m on the secondary cell based on receiving HARQ-ACK information for PDSCH transmission using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In another aspect of the present disclosure, a base station for receiving HARQ-ACK information in a wireless communication system is provided herein. The base station includes: 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. The operations may include: performing PDSCH transmission in a plurality of cells including a primary cell for a user equipment and including a secondary cell configured for PUCCH cell switching by the user equipment; determining an HARQ-ACK feedback timing value K for PDSCH transmission among a set of HARQ-ACK feedback timing values for a primary cell configured between the primary cell and a secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH transmission and a HARQ-ACK feedback timing value K among time slots of the primary cell; and receiving HARQ-ACK information for PDSCH transmission in a slot m on the secondary cell based on receiving HARQ-ACK information for PDSCH transmission using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In various aspects of the disclosure, the HARQ-ACK feedback timing value K may be determined from among the first set of HARQ-ACK feedback timing values based on a field in a message received by the scheduled PDSCH.
In various aspects of the disclosure, PUCCH cell switching may include switching cells for PUCCH transmission related to multiple cells between a primary cell and a secondary cell according to a predetermined rule.
In various aspects of the disclosure, the method or operation may further include receiving a higher layer signal including a PUCCH cell switching pattern. PUCCH cell switching may be performed according to a PUCCH cell switching pattern.
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.
According to some implementations of the present disclosure, even when subcarrier spacing of cells configured to transmit an uplink control channel is different, cells among the cells that are actually used to transmit the uplink control channel may be switched according to a predefined rule, and the UE and the BS may unambiguously predict cells that are to be actually used to transmit the link control channel.
According to some implementations of the present disclosure, it may be prevented that the transmission timing of an uplink control channel is differently determined according to the subcarrier spacing of a cell configured to transmit the uplink control channel.
According to some implementations of the present disclosure, since scheduling of uplink control channel transmission is performed based on a primary cell regardless of a cell configured to transmit an uplink control channel, and a time slot in which uplink control channel transmission is to be performed on a cell for transmitting an uplink control channel may be determined regardless of whether the uplink control channel is transmitted, the same resource set may be always considered for the uplink control channel regardless of a cell selected for transmitting the uplink control channel. According to some implementations of the present disclosure, since the transmission timing is determined regardless of whether the uplink control channel is actually transmittable, the transmission timing of the uplink control channel is changed according to Time Division Duplexing (TDD) operation, so that a risk of interpreting the transmission timing of the uplink control channel differently between the UE and the BS can be prevented.
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. 10;
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 operational flow of a UE in accordance with some implementations of the present disclosure;
fig. 15 illustrates a process of determining slots for PUCCH transmission in some implementations of the present disclosure;
fig. 16 illustrates a slot in which HARQ-ACK information for PDSCH is transmitted in some implementations of the disclosure;
fig. 17 illustrates an operational flow of a BS according to some implementations of the present disclosure; and
fig. 18 illustrates a process of determining slots for PUCCH reception in 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 (UL 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).
In Dual Connectivity (DC) operation, the term special cell (SpCell) refers to a Pcell of a primary cell group (MCG) or a primary secondary cell (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 (also referred to as a primary PUCCH group) including Pcell and 0 or more scells and a Scell PUCCH group (also referred to as a secondary PUCCH group) including only scells may be configured. For Scell, scell transmitting PUCCH associated with a corresponding cell (hereinafter, PUCCH cell) may be configured. The Scell indicating the PUCCH Scell belongs to the Scell PUCCH group (i.e., the secondary PUCCH group) and PUCCH transmission of related Uplink Control Information (UCI) is performed on the PUCCH Scell. If no PUCCH Scell is indicated for the Scell or the cell indicated for PUCCH transmission of the Scell is a Pcell, the Scell belongs to a Pcell PUCCH group (i.e., a primary PUCCH group) and PUCCH transmission of the related UCI is performed on the Pcell. Hereinafter, if the UE is configured with an SCG and some implementations of the present disclosure related to PUCCH are applied to the SCG, the primary cell may refer to a PSCell of the SCG. If the UE is configured with a PUCCH Scell and some implementations of the present disclosure related to PUCCH are applied to the secondary PUCCH group, the primary cell may refer to the PUCCH Scell of the secondary PUCCH group.
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 as 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 as BS transmits broadcast information/DCI/DL data on or through PBCH/PDCCH/PDSCH, respectively.
In this specification, 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, not receiving a physical signal and/or physical channel may mean that the communication device is not attempting to recover the physical signal and/or physical channel from the radio signal, e.g., is not attempting to decode the physical signal and/or physical channel, but the non-communication device is not actually receiving 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, the BS and 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. For example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and implemented in standards such as LTE Cat NB1 and/or LTE Cat NB 2. However, NB-IoT technology is not limited to the above names. Additionally or alternatively, wireless communication techniques implemented in wireless devices XXX and YYY of the present disclosure may perform communications based on LTE-M techniques. For example, LTE-M technology may be an example of LPWAN technology and is referred to by various names including enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented in at least one of the following various standards: 1) LTE CAT 0, 2) LTE CAT M1, 3) LTE CAT M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communications, and/or 7) LTE M, etc., but the LTE-M technology is not limited to the above names. Additionally or alternatively, in view of low power communication, the wireless communication technology implemented in the wireless devices XXX and YYY of the present disclosure may include at least one of ZigBee, bluetooth, and LPWAN, but the wireless communication technology is not limited to the above names. For example, zigBee technology may create Personal Area Networks (PANs) related to small/low power digital communication based on various standards such as IEEE 802.15.4, and may 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 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 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 multiple 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 ) Number of slots per frame (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 slot -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 ofA set of parameters (e.g., subcarrier spacing) and carriers, from a Common Resource Block (CRB) N indicated by higher layer signaling (e.g., 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. A UE may be configured to have one on a given component carrierOr more BWP. Data communication is performed through the enabled BWP, and only a predetermined number of BWP (e.g., one BWP) among the BWP configured for the UE 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＝ 275, indicating an offset RB under the assumption 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 of a corresponding cell group or Scell. 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 of an SFI will be referred to as an 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 a (start) position of a slot format combination ID (i.e., SFI index) of the corresponding serving cell in the SFIDCI, a set of slot format combinations applicable to the serving cell, and a 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 (see, e.g., 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 an SFI index of the serving cell among SFI indexes in a 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 by SFIDCI as UL/DL symbols or flexible symbols.
If the TDD DL-UL pattern is not configured, the UE determines whether each slot is for UL or DL 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 transmission of a DL or UL signal and determines symbol allocation in each slot.
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 resource allocation information on the DL-SCH is referred to as PDSCH scheduling DCI, and the DCI including resource allocation information on 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 is a physical layer UL channel for Uplink Control Information (UCI) transmission. The PUCCH carries UCI. The UCI type transmitted on the PUCCH includes hybrid automatic repeat request acknowledgement (HARQ-ACK) information, scheduling Request (SR), and Channel State Information (CSI). UCI bits include HARQ-ACK information bits (if present), SR information bits (if present), link Recovery Request (LRR) information bits (if present), and CSI bits (if present). In the present disclosure, the HARQ-ACK information bits correspond to HARQ-ACK codebooks. 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 (CRI), an SS/PBCH resource block indicator (SSBRI), and a layer indicator (L1). CSI can 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 can 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 number of bits=<N 1
...
PUCCH resource set # (K-1), if N K-2 <UCI number of bits=<N K-1
Here, K represents the number of PUCCH resource sets (K>1) And N i The maximum UCI bit number supported by PUCCH resource set #i is represented. 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 5).
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 a 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 sets, 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 permissions/assignments
The PDCCH may be used to schedule DL transmissions on PDSCH and UL transmissions on PUSCH. The DCI on the PDCCH used to schedule the DL transmission can include a DL resource assignment including at least a modulation and coding format (e.g., a 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 configuration, each index row 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. There are two PDSCH/PUSCH mapping types: one is mapping type a and the other is mapping type B. In case of PDSCH/PUSCH mapping type a, DMRS is mapped to PDSCH/PUSCH resources with respect to the beginning of a slot. One or two symbols of PDSCH/PUSCH resources may be used as DMRS symbols, depending on other DMRS parameters. For example, in case of PDSCH/PUSCH mapping type a, the DMRS is located in the third symbol (symbol # 2) or the fourth symbol (symbol # 3) in the slot according to RRC signaling. In case of PDSCH/PUSCH mapping type B, DMRS is mapped with respect to the first OFDM symbol of PDSCH/PUSCH resources. One or two symbols from the first symbol of PDSCH/PUSCH resources may be used as DMRS symbols according to other DMRS parameters. For example, in case of PDSCH/PUSCH mapping type B, the DMRS is located at 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 on 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 configuring configuration grant type 1, 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 configuring configuration grant type 1 for a serving cell through RRC, the UE stores 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 at 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 is (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) ] module nrofHARQ-process+harq-ProcID-Offset 2, wherein current_symbol= (SFN x number of slots in number of slots of number symbols per slot + frame, and number of slots per frame and 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 the PDCCH and stored or cleared based on L1 signaling indicating SPS activation or deactivation. When configuring SPS, the BS may provide the following parameters to the UE 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 assignment for SPS;
n1PUCCH-AN, HARQ resources of PUCCH for SPS are provided (the network configures HARQ resources to 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 configured DL assignment with 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/periodicity) ] module nrofHARQ-process+harq-ProcID-Offset, where current_slot= [ (SFN x number slot perframe) +number of slots in frame ], and number slot perframe represents the 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 configures the 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
The actual DL assignment and UL grant for DL SPS or UL grant type 2 and the corresponding MCS are provided by resource assignment fields (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 into 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 the (UE-specific) higher layer (e.g., RRC) signal. 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 a type 1HARQ-ACK codebook. For a type 1HARQ-ACK codebook, the number of bits to be transmitted in the HARQ-ACK report is fixed and may be large. If many cells are configured, but only a few cells are scheduled, the type 1HARQ-ACK codebook may be inefficient.
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 referred to as a type 2HARQ-ACK codebook. The type 2HARQ-ACK codebook may be considered as optimized HARQ-ACK feedback because the UE only sends feedback for the scheduled serving cell. However, under poor channel conditions, the UE may erroneously determine the number of scheduled serving cells. 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 illustrates an example of a process of processing a collision between UL channels by a UE 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 a plurality of 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 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 overlapping 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 overlapping PUCCHs and/or PUSCHs (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 overlapped PUCCHs and/or PUSCHs (on the time axis). T1 may be based on i) a minimum PDSCH processing time N defined in terms of UE processing capability 1 And/or ii) d predefined as an integer equal to or greater than 0 according to the location of the scheduling symbol, PDSCH mapping type, BWP switch, etc 1,1 To determine.
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 capacities #1 and #2, respectively, and μ is (μ) PDCCH ,μ PDSCH ,μ UL ) One leading to a maximum T1, where μ PDCCH μ corresponds to the subcarrier spacing of the PDCCH for scheduling PDSCH PDSCH Subcarrier spacing, μ corresponding to scheduled PDSCH 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 the PDSCH has a mapping type B for UE processing capability #1, 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 scheduled 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 Symbols that can be categorized as and scheduledD related to the position of (2) 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 μ is (μ) DL ,μ UL ) One leading to a maximum T1, where μ DL Subcarrier spacing, μ corresponding to PDCCH carrying DCI for scheduling PUSCH 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 PDSCH processing capability supported thereby to the BS for a carrier corresponding to one of the band entries in the band combination. For example, it may be reported whether the UE supports only PDSCH processing capability #1 or PDSCH processing capability #2 as UE capability with respect to the respective subcarrier spacing (SCS) supported in the corresponding frequency band. The UE may report to the BS regarding the carrier corresponding to one of the band entries in the band combination, thereby supporting PUSCH processing capability. For example, it may be reported whether the UE supports only PUSCH processing capability #1 or PUSCH processing capability #2 as UE capability with respect to the respective SCS supported in the corresponding frequency band.
If a UE configured to multiplex different UCI types within one PUCCH intends to transmit a plurality of overlapping PUCCHs in a slot or 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. If the multiplexing timeline condition is satisfied, the UE may perform UCI multiplexing for UL channels #1 to # 3. 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 one 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 PUCCH in a slot, the BS may not perform fast back-to-back scheduling of PDSCH and the UE may not perform fast HARQ-ACK feedback. Accordingly, multiple (non-overlapping) HARQ-ACK PUCCHs (or PUSCHs) may be allowed to be transmitted in one slot for more flexible and efficient resource usage and service support. Thus, in some scenarios, PUCCH feedback based on a slot comprising 14 OFDM symbols may be considered, as well as 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 with 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 UL channel transmission or by RRC configuration regarding permissions configured for 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 adjusted to a low priority (or priority index 0).
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, separate codebooks may be formed/generated. 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 for PDSCH of different priorities, the respective PUCCH transmissions of different priorities may consider different parameters and resource configurations (see, e.g., 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 UE may be instructed to generate one or more HARQ-ACK codebooks through the pdsch-HARQ-ACK-codebook list. If the UE is instructed to generate one HARQ-ACK codebook, the HARQ-ACK codebook is associated with a PUCCH with priority index 0. If pdsch-HARQ-ACK-codebook list is provided to the UE, the UE multiplexes HARQ-ACK information associated with the same priority index only in the same HARQ-ACK codebook. If the UE is instructed to generate two HARQ-ACK codebooks, the first HARQ-ACK codebook is associated with a PUCCH of priority index 0 and the second HARQ-ACK codebook is associated with a PUCCH of priority index 1.
The unit of time difference between the DL data channel and the PUCCH transmission for HARQ-ACK feedback transmission (e.g., PDSCH-to-harq_feedback timing indicator) may be determined by a preconfigured sub-slot length (e.g., the number of symbols constituting a 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 configuration information PUCCH-Config 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 to the UE semi-statically using a tdd-UL-DL-configuration command or a tdd-UL-DL-configuration decoded message or dynamically using DCI format 2_0. UL or DL scheduling configured by the configured/indicated transmission direction may also be cancelled.
In some scenarios (e.g., LTE-based systems or NR Rel-16 based systems), the Component Carriers (CCs) for PUCCH transmission by a UE (i.e., serving cells) are semi-statically configured by RRC signaling of the BS, and L2/L3 signaling (e.g., MAC Control Elements (CEs) or RRC messages) is used to change CCs. In these scenarios, a large delay may occur when the UE changes PUCCH cells.
In a wireless communication system, a UE may use a plurality of CCs, and the CCs may use frequency bands distant from each other in terms of frequency. From the perspective of network operation, different frequency bands may have different TDD patterns. In some scenarios (e.g., LTE-based systems or NR Rel-16 based systems), HARQ-ACKs corresponding to PDSCH received on scells in Pcell/PSCell or PUCCH groups may be sent only on Pcell, PSCell or PUCCH-Scell in the same PUCCH group. That is, the PUCCH is not transmitted on a general Scell without PUCCH configuration, but is transmitted on one cell among Pcell/PSCell/PUCCH-Scell according to a cell group configured for the UE. According to these scenarios, for example, a UE configured with an SCG transmits HARQ-ACK information for PDSCH received on a cell belonging to the SCG on a Pcell, and transmits HARQ-ACK information for PDSCH received on a cell belonging to the SCG on a PSCell. In addition, according to these scenarios, the UE configured with the PUCCH-SCell transmits HARQ-ACK information for the PDSCH received on the cell belonging to the primary PUCCH group on its Pcell and transmits HARQ-ACK information for the PDSCH received on the cell belonging to the secondary PUCCH group on the PUCCH-SCell. In systems according to these scenarios, the UE may not transmit PUCCH (in order to suppress inter-cell interference) for the duration in which the CC that is to transmit PUCCH is configured as DL, and this may greatly increase HARQ round trip time of PDSCH. To solve this problem, if the UE can perform UL transmission even on a cell (e.g., SCell) other than Pcell/PSCell/PUCCH-SCell among CCs configured by the UE, PUCCH transmission may be considered. However, as described above, since the CC used for PUCCH transmission by the UE is changed using the L2/L3 message, it may take a relatively long time to change the CC, and it is very difficult to change the CC efficiently when considering the length of a general TDD pattern (e.g., about 10 ms).
In the present disclosure, in order to perform PUCCH transmission of a UE as soon as possible, an implementation in which the UE switches CCs to transmit PUCCH for each PUCCH transmission through L1 signaling of a BS or dynamically switches carriers (or cells) to transmit PUCCH through determination of the UE is described.
In the present disclosure, switching CCs may mean switching cells including such CCs. In other words, in the present disclosure, carrier switching may mean switching a cell to another cell, or may mean switching carriers within one cell.
The present disclosure describes such implementations: when a plurality of CCs are available to the UE, the UE dynamically switches PUCCH transmission carriers (e.g., PUCCH cells) for itself according to a predefined rule or according to L1 signaling provided by the BS so that the UE can perform continuous UL transmission.
If the UE is configured with an SCG, the UE may apply some implementations of the disclosure described below to both the MCG and the SCG. If some implementations of the present disclosure described below are applied to an MCG, the terms "secondary cell" and "serving cell" in the following description may refer to the secondary cell and the serving cell, respectively, belonging to the MCG. If some implementations of the present disclosure described below are applied to an SCG, the terms "secondary cell" (without PSCell) and "serving cell" in the following description may refer to secondary cells and serving cells, respectively, belonging to the SCG. Hereinafter, the term "primary cell" may refer to a Pcell of an MCG when some implementations of the present disclosure are applied to the MCG, and to a PSCell of an SCG when some implementations of the present disclosure are applied to the SCG.
When the UE is configured with a PUCCH-SCell, the UE may apply some implementations of the present disclosure described below to both the primary PUCCH group and the secondary PUCCH group. If some implementations of the present disclosure described below are applied to a primary PUCCH group, the terms "secondary cell" and "serving cell" in the following description may refer to a secondary cell and a serving cell, respectively, belonging to the primary PUCCH group. If some implementations of the present disclosure described below are applied to a secondary PUCCH group, the terms "secondary cell" (without PSCell) and "serving cell" in the following description may refer to a secondary cell and a serving cell, respectively, belonging to the secondary PUCCH group. Hereinafter, the term "primary cell" may refer to a Pcell of a primary PUCCH group when some implementations of the present disclosure are applied to the primary PUCCH group, and to a PUCCH-SCell of a secondary PUCCH group when some implementations of the present disclosure are applied to the secondary PUCCH group.
UE side
Fig. 14 illustrates an example of an operational flow of a UE in accordance with some implementations of the present disclosure.
In some implementations, the UE may receive a cell configuration through the access BS and available CC information through the cell configuration. For example, when the UE accesses the BS, the UE may receive an RRC configuration including CC information (e.g., servingCellConfigCommon) from the BS through RRC signaling. The BS may enable or disable individual carriers (also referred to as cells) by sending MAC CE messages to the UE. When the BS schedules PDSCH reception and PUCCH transmission of HARQ-ACK response to PDSCH reception for the UE (S1401), the UE may (dynamically) select a carrier (i.e., PUCCH cell) to transmit PUCCH for HARQ-ACK response using some implementations of the present disclosure (S1403). The UE may determine PUCCH resources to use on the corresponding carrier using some implementations of the present disclosure (S1405). Determining PUCCH resources to use on a carrier for PUCCH transmission may include determining a slot on the carrier where PUCCH transmission will occur.
In some implementations of the present disclosure, the following UE operations may be considered.
< implementation A1> how to select CC for PUCCH transmission
When the BS schedules PDSCH reception and PUCCH transmission of HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs or when UCI is indicated or configured to be transmitted by L1 signaling (e.g., DCI) or higher layer signaling (e.g., RRC signaling) of the BS, the UE may select a carrier to transmit the PUCCH according to at least one of the following methods.
* Method a1_1: the UE may select a PUCCH carrier (i.e., PUCCH cell) based on a data field included in a scheduling message (e.g., DL assignment) of the DCI. As an example, DCI scheduling PDSCH may include a PUCCH carrier indicator field, and UE may select a PUCCH carrier having the same cell index as the value of the PUCCH carrier indicator field to transmit HARQ-ACK response for PDSCH using the PUCCH carrier.
* Method a1_2: the UE and the BS may select CCs to be used for PUCCH transmission according to predetermined conditions and rules so that the UE and the BS may select and assume the same cell without separate signaling. More specifically, the UE and the BS may select CCs to be used for PUCCH transmission from among CCs satisfying a predetermined condition according to a rule. This may be expressed such that the UE and the BS select one CC located at the top of the ordered list of CCs according to conditions. For example, the UE and the BS may configure an ordered list of CCs according to a first rule and transmit HARQ-ACK responses for the scheduled PDSCH by selecting a CC at the top of the list from CCs prioritized by a second rule. The UE and the BS can always unambiguously assume the same CC as long as the first rule and the second rule are based on semi-statically configured values. In other words, the UE may preferentially select a specific CC according to a specific condition and transmit a PUCCH on the corresponding CC.
In configuring the ordered list of CCs, at least one of the following rules may be used as the first rule.
Rule a1_1-1: the CCs are arranged in ascending order of cell index. That is, the CC with the low cell index is located at the upper side of the list.
Rule a1_1-2: CCs that do not include a particular configuration may be excluded from the list or located lower in the list than CCs that include a particular configuration. For example, unconfigured licensed PUSCH configured or periodic or semi-persistent CSI configured CCs may be excluded from the list. This serves to prevent UL transmissions of the UE from being abandoned.
Rule a1_1-3: the non-activated CCs may be excluded from the list or located lower in the list than the activated CCs.
Rule a1_1-4: CCs that do not have SCS equal to or greater than UL BWP of the CC receiving the scheduled PDSCH or SCS equal to or greater than SCS of the primary cell of the PUCCH group receiving the PDSCH (i.e., CCs having SCS less than UL BWP of the CC receiving the scheduled PDSCH) may be excluded from the list or may be located at a lower position in the list than other CCs.
Rule a1_1-5: CCs that do not have SCS equal to UL BWP of the CC receiving the scheduled PDSCH or SCS equal to SCS of the primary cell of the PUCCH group receiving the PDSCH (i.e., CCs having SCS less than UL BWP of the CC receiving the scheduled PDSCH) may be excluded from the list or may be located at a lower position in the list than other CCs.
Rule a1_1-6: when a symbol of a PUCCH resource to transmit a HARQ-ACK response for a scheduled PDSCH (or a PUCCH resource to which all UCI in a slot to transmit a corresponding HARQ-ACK response is multiplexed/transmitted) is not indicated as an UL or flexible symbol by a slot format configured for a specific cell (i.e., when at least one symbol of the PUCCH resource is indicated as a DL symbol), the corresponding cell may be excluded from the list or located at a lower position in the list than other CCs. It may be a great burden for the UE and the BS to consider slot formats, PUCCH resource sets, and PUCCH payloads of all CCs of each PUCCH transmission. One of the following rules may be considered in place of the rule a1_1-6 to consider the slot format for carrier switching while minimizing the burden on the UE and BS.
Substitution rule a1_1-6-1: when a slot for transmitting a HARQ-ACK response for the scheduled PDSCH includes a DL slot in a slot format configured for a particular cell, the corresponding cell may be excluded from the list or located lower than other CCs in the list.
Substitution rule a1_1-6-2: when a starting symbol of a PUCCH transmitting a HARQ-ACK response for the scheduled PDSCH is not indicated as a UL symbol in a slot format configured for a particular cell, the corresponding cell may be excluded from the list or located lower than other CCs in the list.
Rule a1_1-7: when there is no PUCCH resource set having a maximum payload size greater than the total bit size (i.e., number of bits) of the HARQ-ACK response for the scheduled PDSCH and UCI that may be transmitted together with the HARQ-ACK response, the corresponding cell may be excluded from the list or may be located lower than other CCs in the list.
Rule a1_1-8: the dormant BWP-enabled CCs may be excluded from the list or may be located lower in the list than other CCs. In the present disclosure, the dormant BWP is one of DL BWP and is configured by the network through dedicated RRC signaling. In dormant BWP, the UE stops PDCCH monitoring for Scell, but continues to perform CSI measurement, automatic gain control (ACG), and beam management (when configured). For each serving cell other than SpCell or PUCCH SCell, the network may configure one BWP as dormant BWP.
At least one of the following rules may be used as the second rule when selecting one CC from the ordered list of CCs.
Rule a1_2-1: the UE preferentially selects CCs with low cell indexes. Rule a1_2-1 may be applied last. That is, the UE may select the CC having the lowest cell index when another second rule does not exist in the list or when a plurality of CCs satisfy the second rule.
Rule a1_2-2: the UE may preferentially select only CCs that include a particular configuration. For example, the UE may prefer CCs with a configured licensed PUSCH configuration or periodic or semi-persistent CSI configuration. This serves to prevent UL transmissions of the UE from being abandoned.
Rule a1_2-3: the UE may prefer an enabled CC.
Rule a1_2-4: the UE may preferentially select SCS equal to or greater than UL BWP of the CC receiving the scheduled PDSCH or CC equal to or greater than SCS of the primary cell of the PUCCH group receiving the PDSCH.
Rule a1_2-5: the UE may preferentially select CCs of which SCS is the same as SCS of UL BWP of a CC receiving the scheduled PDSCH or SCS of a primary cell of a PUCCH group receiving the PDSCH.
Rule a1_2-6: when PUCCH resources to transmit HARQ-ACK responses for the scheduled PDSCH (or PUCCH resources to which all UCI in a slot to transmit a corresponding HARQ-ACK response is multiplexed/transmitted) are indicated as UL or flexible symbols in a slot format configured for a particular cell (i.e., when at least one symbol of the PUCCH resources is not indicated as DL symbol), the UE may preferentially select the corresponding cell. It may be a great burden for the UE and the BS to consider slot formats, PUCCH resource sets, and PUCCH payloads of all CCs of each PUCCH transmission. Instead of the rule a1_2-6, one of the following rules may be considered to consider the slot format for carrier switching while minimizing the burden on the UE and BS.
Substitution rule a1_2-6-1: when a slot in which a HARQ-ACK response for the scheduled PDSCH is to be transmitted does not include a DL slot in a slot format configured for a specific cell, the UE may preferentially select the corresponding cell.
Substitution rule a1_2-6-2: when a starting symbol of a PUCCH transmitting a HARQ-ACK response for the scheduled PDSCH is indicated as an UL symbol in a slot format configured for a specific cell, the UE may preferentially select the corresponding cell.
Rule a1_2-7: when there is a PUCCH resource set having a maximum payload size greater than a total bit size of a HARQ-ACK response to the scheduled PDSCH and UCI that may be transmitted together with the HARQ-ACK response, the UE may preferentially select a corresponding cell.
Rule a1_2-8: the UE may prefer CCs that do not enable dormant BWP.
A simple example of the method a1_2 based on the rule expression described above can be as follows.
The UE may configure the ordered list of enabled CCs using rules a1_1-1 and a1_1-3 and select the CC at the top of the list to transmit PUCCH. That is, the UE may transmit the PUCCH on the CC having the lowest index among the enabled CCs through the method a1_2.
The UE may configure an ordered list of enabled CCs using rule a1_1-3 and select the CC with the lowest cell index to transmit PUCCH using rule a1_2-1. That is, the UE may transmit the PUCCH on the CC having the lowest index among the enabled CCs through the method a1_2.
In some implementations of the present disclosure, the dormant BWP may be a BWP having a BWP ID equal to a value of dormantBWP-ID indicated by RRC signaling.
In some implementations of the disclosure, the UE may be provided by the BS alone with RRC parameters indicating the CC set. The CC set may indicate CCs (i.e., cells) that may be subject to PUCCH carrier switching. The UE and the BS may perform PUCCH carrier switching restrictively within the configured CC set.
For example, the BS may configure the UE with RRC parameters indicating the set of CCs available according to time. The CC set may indicate CCs that may be subject to PUCCH carrier switching. The UE and the BS may perform PUCCH carrier switching restrictively within the configured CC set. In this case, the following can be considered.
The PUCCH carrier switching pattern may be configured for the UE through higher layer signaling of the BS. The PUCCH carrier switching pattern may mean information to list a list including one or more available UL CCs in order according to a specific time unit (e.g., several slots) within a specific time period (e.g., several tens of slots, one frame, or 10 ms). To indicate that the list of available UL CCs occupies a specific time unit, a time length T may be included in each list L . Length of time T L The time taken by the corresponding list may be meant. In this case, the period of the PUCCH carrier switching pattern may be the time length T of the list of available UL CCs L Is a sum of (a) and (b). For example, there may be a specific UL CC list l1= { C1, C2, C3}, and time information T may be additionally assigned to the list L1 L . For example, l1= { { C1, C2, C3}, T may be provided L }. In this case, it may be at time T L During which at least one of C1, C2 or C3 is used. These lists may be enumerated sequentially. For example, if the list is given as { L1, L2, L3,..ln }, the sum of the time lengths T of the respective lists LN may represent the length of the entire pattern. In some implementations, information indicating that PUCCH carrier switching is not performed for a specific duration may also be included in one or more patterns. This information can also be represented as a list of UL CCs including individual RRC parameters (e.g., nopucc hcarrierswitching). The UE may not perform PUCCH carrier switching for a duration including such information. The time unit or the slot length (i.e., the time length per slot) may be determined by UL SCS configuration configured in the cell. For example, at least one of the following may be considered.
A separate UL reference SCS of PUCCH carrier switching pattern may be configured, and a time unit may be determined by a corresponding SCS value.
The time unit may be determined by the maximum or minimum SCS among SCSs of UL BWP configured for the UE.
The time units may be determined by a configurable maximum or minimum SCS in the cell. As an example, the time units may be determined by the minimum or maximum SCS configuration u provided by the freefinul or SCS-specificcarrier list of the freefinul-SIB.
When the length of one frame is 10ms, the slot length according to each SCS configuration u can be determined according to table 1.
For example, in some implementations, PUCCH carrier switching may be performed only when at least one symbol of a PUCCH resource (or PUCCH resource where all UCI in a slot where HARQ-ACK response is to be transmitted is multiplexed/transmitted) to which HARQ-ACK response for a scheduled PDSCH is to be transmitted (prior to PUCCH carrier switching) is indicated as a DL symbol in a slot format configured for a primary cell (e.g., at least one symbol of PUCCH is indicated as DL by tdd-UL-DL-configuration command or tdd-ULDL-configuration-configured).
As another example, in some implementations, PUCCH carrier switching may be performed only when at least one symbol of a PUCCH resource (in a reference cell) to transmit a HARQ-ACK response for a scheduled PDSCH (or a PUCCH resource to which all UCI in a slot in which the HARQ-ACK response is multiplexed/transmitted) is indicated as a DL symbol in a slot format of the reference cell (e.g., at least one symbol of a PUCCH is indicated as DL by tdd-UL-DL-configuration command or tdd-ULDL-configuration-configured). The reference cell may be determined in consideration of the following.
A primary cell is used as a reference cell;
a cell index configured by higher layer signaling of the BS indicates a reference cell; or alternatively
The CC with the lowest cell index among the CC set for PUCCH carrier switching is used as the reference cell.
In implementation A1, HARQ-ACK PUCCH corresponding to PDSCH reception has been assumed for PUCCH. However, implementation A1 may not be limited to HARQ-ACK PUCCH, and implementation A1 and the implementations to be described may also be applied to PUCCHs carrying any type of UCI (e.g., HARQ-ACK, SR, or CSI). In particular, when PUCCH transmission is indicated through L1 signaling of the BS, the method a1_1 and/or the method a1_2 of the implementation A1 may be applied. When PUCCH transmission is indicated through higher layer signaling of the BS, the method a1_2 of implementation A1 may be applied.
< implementation A2> how to determine PUCCH resources for carrier switching
When the BS schedules PDSCH reception and PUCCH transmission for HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs, the UE may determine PUCCH resources on a carrier on which PUCCH is to be transmitted based on one of the following methods.
* Method a2_1: the UE (PUCCH resource configuration in scheduling CC) may select PUCCH resources using a PUCCH resource set list configured in a cell scheduling PDSCH (i.e. a cell receiving PDSCH). By the method a2_1, the ue can assume that one PUCCH resource set list is to be used regardless of the CC to be selected. This may make it easy to consider the slot format in CC selection.
* Method a2_2: (PUCCH resource configuration in primary CC) the UE may select PUCCH resources using a PUCCH resource set list configured in a primary cell of a PUCCH group of the scheduled PDSCH. By the method a2_2, the ue can assume that the same PUCCH resource will always be used regardless of the CC to be selected. This may make it easy to consider the slot format in CC selection.
* Method a2_3: (PUCCH resource configuration in target CC) the UE may select PUCCH resources using a PUCCH resource set list configured in a cell to transmit the HARQ-ACK response. The cell to send the HARQ-ACK response may be determined using implementation A1/B1 or similar methods. This may bring scheduling flexibility by allowing the BS to configure appropriate PUCCH resources for each CC transmitting PUCCH.
* Method a2_4: (dedicated PUCCH resources for PUCCH carrier switching) when a cell to transmit PUCCH is explicitly indicated or can be explicitly indicated in a PDSCH scheduling message, or when PUCCH is to be transmitted in a cell other than the primary cell according to a predefined rule, the UE may select PUCCH resources using a separate PUCCH resource set list configured by the BS. In other words, when the PUCCH carriers are (dynamically) switched according to time, the BS may individually configure PUCCH resource configurations to be used for the UE.
The method a2_1, the method a2_2, and/or the method a2_3 represent PUCCH resource sets and PUCCH resources that may be configured for the UE to be used for PUCCH carrier switching of individual CCs available for UL transmission, in particular PUCCH transmission. Such PUCCH resource sets and PUCCH resources may be values additionally configured within a conventional PUCCH resource configuration (e.g. PUCCH resource configuration according to 3GPP TS 38.331Rel-16), and each PUCCH resource set and each PUCCH resource may have a specific index range.
< implementation A3> how to determine PDSCH-to-HARQ-ACK feedback timing for PUCCH carrier switching
When the BS schedules PDSCH reception and PUCCH transmission for HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs and when CCs for which PUCCH resources are to be transmitted are (dynamically) switchable (e.g., when CCs to be used are indicated by L1 signaling (e.g., DCI) or may vary with respective PUCCH transmissions according to a predefined rule), the UE needs to determine a location of an UL slot in which PUCCH is to be transmitted in order to transmit PUCCH on the determined CCs. In some implementations, the predefined rule may include a PUCCH carrier switching pattern provided by higher layer signaling of the BS. The location of the UL slot may be determined from a set of pre-configured HARQ-ACK feedback timing values and a data field of a scheduling message indicating a value to be used in the set based on the slot in which the last PDSCH has been received.
In some scenarios (e.g., LTE or NR Rel-16 based systems), since there is only one PUCCH cell in one PUCCH group, the UE need only determine the HARQ-ACK feedback timing value indicated by the scheduling information of the PDSCH in the set of HARQ-ACK feedback timing values configured in the corresponding PUCCH cell and apply the HARQ-ACK feedback timing value based on the slot of the corresponding PUCCH cell. However, in some implementations of the present disclosure, more than one PUCCH cell may be included in one PUCCH group for PUCCH cell switching, and a set of HARQ-ACK feedback timing values may be configured for each PUCCH cell. Thus, if there are a plurality of PUCCH cells in a PUCCH group where PDSCH is scheduled, it is unclear which PUCCH cell configuring a set of HARQ-ACK feedback timing values the UE should determine the HARQ-ACK feedback timing value of PDSCH and which time slot and from which time slot the UE should count as many time slots as the HARQ-ACK feedback timing value based on.
Fig. 15 illustrates a process of determining slots for PUCCH transmission in some implementations of the present disclosure.
Referring to fig. 15, the ue may receive a PDSCH based on scheduling information (S1501). The UE may determine a set of HARQ-ACK feedback timing values to be used to determine a location of an UL slot for which HARQ-ACK transmission of a PDSCH scheduled for the UE is to be performed by at least one of the following methods.
* Method a3a_1: the UE (K1 set in the scheduling CC) may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for a cell scheduling PDSCH (i.e., a cell receiving PDSCH). For example, when the UE detects DCI format 1_1 and receives PDSCH based on DCI format 1_1, the UE may determine HARQ-ACK feedback timing value K of PDSCH among HARQ-ACK feedback timing values provided through dl-DataToUL-ACK of a cell receiving PDSCH and determine PUCCH slots using the determined HARQ-ACK timing value K. With method A3a-1, the ue may assume that the set of HARQ-ACK feedback timing values will be used irrespective of the CC to be selected for PUCCH transmission, which may make it easy to consider slot format in CC selection. In other words, according to the method A3a-1, since the HARQ-ACK feedback timing value is not changed even when PUCCH carrier switching occurs, the slot format of each CC can be accurately designated before CC selection.
* Method a3a_2: the UE (K1 set in the primary CC) may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for the primary cell of the PUCCH group for scheduling PDSCH. For example, if the PUCCH group for scheduling PDSCH is MCG, the UE may determine HARQ-ACK feedback timing value K for PDSCH based on the set of HARQ-ACK feedback timing values configured for Pcell. If the PUCCH group of the scheduled PDSCH is SCG, the UE may determine the HARQ-ACK feedback timing value K of the PDSCH based on the set of HARQ-ACK feedback timing values configured for the PSCell. If the PUCCH group of the scheduled PDSCH is the primary PUCCH group, the UE may determine the HARQ-ACK feedback timing value K of the PDSCH based on the set of HARQ-ACK feedback timing values configured for the Pcell. If the PUCCH group of the scheduled PDSCH is a secondary PUCCH group, the UE may determine the HARQ-ACK feedback timing value K of the PDSCH based on a set of HARQ-ACK feedback timing values configured for the PUCCH-SCell of the secondary PUCCH group. By the method a3a_2, the ue can assume that the same set of HARQ-ACK feedback timing values will always be used irrespective of the CC to be selected for PUCCH transmission, which can make it easy to consider slot format in CC selection. In other words, according to the method A3a-2, since the HARQ-ACK feedback timing value is not changed even when PUCCH carrier switching occurs, the slot format of each CC can be accurately designated before CC selection.
* Method a3a_3: the UE (set in the target CC of K1) may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for the cell to which the HARQ-ACK response is to be transmitted.
* Method a3a_4: (dedicated K1 set for PUCCH carrier switching) when a cell to transmit PUCCH is explicitly indicated or can be explicitly indicated by a PDSCH scheduling message or when PUCCH is to be transmitted in a cell other than the primary cell according to a predefined rule, the UE may select PUCCH resources using a set of HARQ-ACK feedback values configured separately by the BS for PUCCH cell switching. The BS may individually configure a set of HARQ-ACK feedback timing values for the UE to use when dynamically switching PUCCH carriers.
The UE may determine HARQ-ACK feedback timing of the corresponding PDSCH based on the determined set of HARQ-ACK feedback timing values according to one of the methods a3a_1 to a3a_4 (S1503). For example, when a PDSCH-to-harq_feedback timing indicator included in DCI including a PDSCH, the UE may determine a HARQ-ACK feedback timing value K indicated by the PDSCH-to-harq_feedback timing indicator among the determined set of HARQ-ACK timing values. When the PDSCH-to-harq_feedback timing indicator is 2 bits, if the value of the PDSCH-to-harq_feedback timing indicator is "00", the first value of the HARQ-ACK timing values in the determined set may be determined as the HARQ-ACK feedback timing value K. If the value of the PDSCH-to-harq_feedback timing indicator is "01", the second value of the HARQ-ACK timing value in the determined set may be determined as HARQ-ACK feedback timing value K. The HARQ-ACK feedback timing K, from which slot to apply to which cell, is questionable.
Fig. 16 illustrates a slot in which HARQ-ACK information of a PDSCH is transmitted in some implementations of the disclosure. In the example of fig. 16, it is assumed that HARQ-ACK feedback timing value K of PDSCH is 2. Fig. 16 shows that the slot length of a cell scheduling PDSCH is greater than that of a PUCCH cell. However, the implementation of the present disclosure may also be applied to a case where the slot length of a cell scheduling PDSCH is less than or equal to the slot length of a PUCCH cell. In the example of fig. 16, PUCCH cell 1 is a primary cell (i.e., pcell, PSCell, or PUCCH-SCell), and PUCCH cell 2 is a secondary cell configured for PUCCH cell handover among cells other than the primary cell. In the present disclosure, a secondary cell configured for PUCCH cell handover, which is not a primary cell among cells of a PUCCH group, is referred to as a secondary PUCCH cell, a PUCCH secondary cell, or a PUCCH secondary Scell or a PUCCH-Scell.
According to the HARQ-ACK feedback timing determined based on the set of HARQ-ACK feedback timing values determined according to one of the methods a3a_1 to a3a_4, the UE may identify a slot (e.g., UL in TDD) in which the PUCCH is to be transmitted, based on one of the following methods, for example, a timing at which the PDSCH is received (e.g., a DL slot at which the PDSCH reception ends, a last UL slot overlapping the DL slot among slots of the primary cell, or a last UL slot overlapping the PDSCH reception among slots of the target cell in which the PUCCH transmission is to be performed) (S1505).
* Method a3b_1: (time slots counted in scheduling CC) when a time slot including reception end timing of PDSCH is time slot n and the determined HARQ-ACK timing value is K on a cell where PDSCH is scheduled (i.e., a cell where PDSCH is received), the UE may transmit PUCCH in time slot m of a cell where HARQ-ACK response that may represent time slot n (i.e., HARQ-ACK response including a result of PDSCH reception performed in time slot n) is to be transmitted. Here, the slot m may be one of the following slots:
-UL slots including the entire slot n+k of the cell that will send HARQ-ACK responses;
UL slots including start timing of slot n+k of a cell that will transmit HARQ-ACK response (refer to (a) of fig. 16);
-UL slots including the end timing of slot n+k for the cell that will send the HARQ-ACK response.
* Method a3b_2: (time slots counted in the primary CC) when a time slot including reception end timing of the PDSCH is time slot n and the determined HARQ-ACK timing value is K on a primary cell of a PUCCH group on which the PDSCH is scheduled, the UE may transmit the PUCCH in time slot m of a cell in which a HARQ-ACK response that may represent time slot n (i.e., a HARQ-ACK response including a result of PDSCH reception performed in time slot n) is to be transmitted. Here, the slot m may be one of the following slots:
-UL slots including the entire slot n+k of the cell that will send HARQ-ACK responses;
UL slots including start timing of slot n+k of a cell that will transmit HARQ-ACK response (refer to (b) of fig. 16);
-UL slots including the end timing of slot n+k for the cell that will send the HARQ-ACK response.
* Method a3b_3: (slots counted in target CC) when a (UL) slot including reception end timing of PDSCH is slot n and the determined HARQ-ACK timing value is K on a cell to which HARQ-ACK response is to be transmitted, the UE may transmit PUCCH in slot n+k (refer to (c) of fig. 16).
The method a3b_1 or a3b_2 may deterministically determine the HARQ transmission timing of the UE by counting HARQ-ACK feedback timings using the same method for each cell or each PUCCH group, and may have an advantage of ensuring a time required for the UE to prepare PUCCH transmission in advance.
Since processing is always performed based on the target CC even when the CC is scheduled as the target CC, the method a3b_3 allows all PUCCHs to be processed in the same manner from the perspective of one cell, thereby reducing implementation complexity of the UE.
< implementation A4> processing of PUCCH transmission without carrier indication
If a UE configured with a plurality of CCs is indicated or configured to transmit UCI on a PUCCH through L1 signaling or higher layer signaling of a BS, and if a CC to which PUCCH resources are to be transmitted can be indicated by L1 signaling (e.g., DCI) provided by the BS, the UE may select a CC to which PUCCH is to be transmitted using one of the following methods for PUCCH resources (e.g., periodic CSI, SPS, or HARQ-ACK to PDSCH) not indicated by the L1 signaling.
* Method a4_1: the UE follows the last received PUCCH carrier indication (e.g. an indicator for determining the CC for which PUCCH is to be transmitted). That is, after explicitly indicating the CC transmitting the PUCCH, PUCCH transmission is performed on the indicated CC for all PUCCHs transmitted by the UE.
* Method a4_2: in the case of a PUCCH indicating a carrier to transmit the PUCCH, the UE determines a CC to transmit the PUCCH according to the indication, and for other PUCCHs, the UE selects a CC to transmit the PUCCH on the assumption that there is no indicator.
* Method a4_2-1: if the PUCCH resource X not indicated by the L1 signaling overlaps in time with the PUCCH Y of the CC a indicating the PUCCH resource to be transmitted, the UE may transmit the PUCCH resource X on the CC a by multiplexing the PUCCH resource X with the PUCCH Y.
* Method a4_2-2: if the PUCCH resource X not indicated by the L1 signaling overlaps in time with the PUCCH Y indicating the CC a to transmit the PUCCH resource, the UE may transmit the PUCCH X and the PUCCH Y on the corresponding CC. That is, PUCCH X may be transmitted on a CC selected by assuming that no indicator exists, and PUCCH Y may be transmitted on CC a. The UE may send information about whether such operation is available to the BS through an RRC message in the form of a UE capability report. The BS may configure the use of the corresponding operation for the UE capable of performing such operation through the RRC message. Only when the UE is configured to use the corresponding operation, the UE may process the PUCCH transmission overlapping in time through the method a4_2-2.
< implementation A5> processing for repetition of PUCCH carrier switching
When a UE configured with a plurality of CCs is indicated or configured to transmit UCI on a PUCCH through L1 signaling or higher layer signaling of a BS, and when a CC to which PUCCH resources are to be transmitted can be indicated by L1 signaling (e.g., DCI) provided by the BS or the UE differently determines CCs to which PUCCH resources are to be transmitted according to respective PUCCHs, respective UCI types, and/or scheduling methods (semi-statically configured or dynamically scheduled), two or more PUCCH transmissions may be indicated to be performed on different CCs. When these PUCCHs overlap in time, the UE may select a CC that will transmit the PUCCH by at least one of the following methods.
* Method a5_1: for PUCCH transmissions overlapping each other, the UE follows a PUCCH carrier indication (i.e., an indicator for determining a CC to transmit the PUCCH) included in the last received DCI among the DCIs triggering the PUCCH transmissions.
* Method a5_2: for PUCCH transmissions overlapping each other, the UE may determine CCs on which to transmit (multiplexed) PUCCH based on PUCCH transmission having the earliest start timing of PUCCH resources.
* Method a5_3: for PUCCH transmissions overlapping each other, the UE may determine CCs on which to transmit (multiplexed) PUCCHs based on PUCCH resources indicated or configured to transmit HARQ-ACKs. When there are two or more PUCCH resources indicated or configured to transmit HARQ-ACK, the UE may determine CCs to transmit PUCCH based on a dynamically indicated PUCCH instead of a semi-statically configured PUCCH, and determine CCs to transmit PUCCH based on a PUCCH indicated later among the dynamically indicated PUCCHs.
* Method a5_4: when priorities are indicated or configured for the respective PUCCHs, the UE may determine CCs on which to transmit the PUCCHs based on PUCCHs having high priorities. When there are two or more PUCCHs having the same priority, the UE may determine CCs to transmit the PUCCHs using method a5_1, method a5_2, and/or method a5_3 for the corresponding PUCCHs.
< implementation A6> dynamic PUCCH carrier indication
As described above, when the BS schedules PDSCH reception and PUCCH transmission for HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs or when the UE is instructed or configured to transmit UCI through L1 signaling or higher layer signaling provided by the BS, the UE may select a PUCCH carrier based on a data field included in a scheduling message (e.g., DL assignment) of DCI (see method a1_1/b1_1 of implementation A1/B1). In other words, the UE may determine a CC that will transmit the HARQ-ACK PUCCH for the corresponding PDSCH by scheduling DCI of the PDSCH. In this case, at least one of the following methods may be considered as a method of scheduling DCI indicating CCs.
* Method a6_1: the DCI scheduling the PDSCH may include a PUCCH carrier indicator, and the UE may select a PUCCH carrier having a cell index associated with a value of the PUCCH carrier indicator to transmit the HARQ-ACK response for the PDSCH using the selected PUCCH carrier. The value of the PUCCH carrier indicator may be provided by a separate new DCI field or may be a value derived by re-interpreting some Most Significant Bits (MSBs) or Least Significant Bits (LSBs) of an existing DCI field.
* Method a6_2: when DCI of the scheduled PDSCH includes a PUCCH Resource Indicator (PRI) field and a value of the PRI field is associated with one PUCCH resource Identifier (ID) configured in any PUCCH resource set,
for each PUCCH resource ID, a CC that will transmit the PUCCH resource associated with the corresponding PUCCH resource ID may be configured, or
For each PUCCH resource set, CCs that will transmit PUCCH resources in the corresponding PUCCH resource set may be configured.
* Method a6_3: it is assumed that PUCCH carrier switching is performed when PUCCH indicated by DCI cannot be transmitted through TDD operation. In this case, the CC to be transmitted may be determined using the method of implementation A1/B1. When PUCCH carrier switching occurs, PUCCH resources may be determined based on PUCCH resources and PUCCH resource sets separately configured for PUCCH carrier switching.
* Method a6_4: one of the bit representations (e.g., all "1" s or all "0 s") that may be indicated by the PUCCH carrier indicator may be reserved as "no handover state". For example, when the "no handover state" is indicated, the UE may perform PUCCH transmission on the primary cell without performing PUCCH carrier handover. As another example, when the UE is instructed to semi-statically perform PUCCH carrier switching, for example, when a PUCCH carrier pattern configured according to time is semi-statically configured for the UE and the UE is configured to perform PUCCH carrier switching based on the pattern, if a value other than "no switching state" is indicated by the PUCCH carrier indicator, the UE may ignore the configured PUCCH carrier pattern and perform PUCCH transmission by the indicated PUCCH carrier. In contrast, when the "no handover state" is indicated to the UE through the PUCCH carrier indicator, the UE may select PUCCH resources based on the PUCCH carrier pattern (i.e., select PUCCH resources based on the PUCCH resource configuration of the carrier selected according to the PUCCH carrier pattern) and perform PUCCH transmission on the corresponding PUCCH carrier.
When using implementation A5/B5, it may always be assumed that PUCCH carrier switching is not performed when the UE transmits a HARQ-ACK response (SPS PDSCH HARQ-ACK response) for the SPS PDSCH, in particular, when the UE performs PUCCH transmission transmitting only SPS PDSCH HARQ-ACK. For example, when the enabling DCI of the SPS PDSCH indicates a CC that will transmit HARQ-ACK of the scheduled PDSCH, the UE may transmit PUCCH on the indicated CC for the PDSCH indicated by the DL assignment included in the enabling DCI, but thereafter may ignore the indicated CC for HARQ-ACK response to the PDSCH received through the configured DL assignment and transmit PUCCH on the CC determined according to 3GPP NR Rel-16.
< implementation A6-1> dynamic PUCCH scheduling using DCI without carrier indication
In using the implementation A6/B6, it is necessary to use different PDSCH-to-HARQ-ACK timing (i.e., HARQ-ACK feedback timing) according to the switched CCs as in the implementation A3/B3. However, some DCI formats (e.g., DCI formats such as DCI format 1_0) may not include a carrier indication field for carrier switching. For a UE configured to perform carrier switching, a DCI format without a carrier indication is scheduled, and a carrier to transmit PUCCH resources and PUCCH may be determined as follows.
* Method A6-1a_1: the UE assumes that PUCCH is scheduled on the primary cell. To select PUCCH resources, a set of PUCCH resources and a set of HARQ-ACK feedback timing values of the primary cell are used, and a slot length of the primary cell is used.
* Method A6-1a_2: when configuring a separate reference cell or reference SCS for a carrier switching operation, for example, when a set of HARQ-ACK feedback timing values, a slot length, and a reference cell of an SCS used for determination of PDSCH-to-HARQ-ACK timing (i.e., HARQ-ACK feedback timing) are predefined or configured through higher layer signaling of a BS in a carrier switching operation, if PUCCH transmission is scheduled using a DCI format without carrier indication, the UE uses the PUCCH resource set of the reference cell and the set of HARQ-ACK feedback timing values and uses the slot length of the reference cell in order to select PUCCH resources under the assumption that PUCCH is scheduled on a primary cell.
* Method A6-1a_3: when configuring a separate reference SCS for a carrier switching operation, for example, when a reference SCS for determining an SCS to be used in the carrier switching operation is predefined or configured through higher layer signaling of the BS, if PUCCH transmission is scheduled with a DCI format without carrier indication, the UE uses a PUCCH resource set of a primary cell and a set of HARQ-ACK feedback timing values and uses a slot length of the reference cell in order to select PUCCH resources under the assumption that PUCCH is scheduled on the primary cell.
* Method A6-1a_4: when the UE is instructed to semi-statically perform PUCCH carrier switching, for example, when a PUCCH carrier pattern semi-statically configured over time is configured for the UE and the UE is configured to perform PUCCH carrier switching based on the corresponding pattern, if PUCCH transmission is scheduled with a DCI format without carrier indication, the UE may select a PUCCH carrier based on the PUCCH carrier pattern and perform PUCCH transmission on the corresponding PUCCH carrier. In contrast, if PUCCH transmission is scheduled for the UE using the DCI format with the carrier indication, the UE may ignore the configured PUCCH carrier pattern and perform PUCCH transmission on the PUCCH carrier indicated by the carrier indication.
When multiple PUCCHs are scheduled for a UE configured to perform carrier switching by one or more DCI formats without carrier indication and/or one or more DCI formats with carrier indication, and when the PUCCHs are scheduled in one slot, the UE may select a CC to transmit the PUCCHs by at least one of the following methods.
* Method A6-1b_1: the UE assumes that all overlapping PUCCH transmissions are sent on the same CC. In this case, PUCCHs scheduled through DCI formats without carrier indication may be transmitted on CCs indicated by scheduling of other PUCCHs overlapped therewith.
* Method A6-1b_2: the UE assumes that PUCCHs scheduled with DCI formats without carrier indication are scheduled on the primary cell and that all PUCCH transmissions overlapping each other will be transmitted on the same CC. In this case, the UE may assume that all other PUCCH scheduling indicating primary cells overlapped with PUCCH scheduled by the DCI format without carrier indication are as PUCCH cells.
* Method A6-1b_3: for PUCCH transmissions overlapping each other, the UE follows a PUCCH carrier indication (i.e., an indicator for determining a CC to transmit the PUCCH) included in the last received DCI among the DCIs triggering the PUCCH transmissions.
* Method A6-1b_4: the UE assumes that PUCCH scheduled with DCI format without carrier indication is scheduled on the primary cell. For PUCCH transmissions overlapping each other, the UE assumes that overlapping PUCCH transmission is performed on a DCI scheduled UL CC that is received last among DCIs triggering PUCCH transmission.
* Method A6-1b_5: the UE assumes that PUCCHs scheduled with DCI formats without carrier indication are scheduled on the primary cell and that all PUCCH transmissions overlapping each other will be transmitted on the same CC. In this case, the UE may assume that all other PUCCH schedules overlapped with PUCCH scheduled by a DCI format without carrier indication indicate the primary cell as a PUCCH cell.
When one or more PUCCHs (e.g., multiple) are scheduled for a UE configured to perform carrier switching by one or more DCI formats without carrier indication and/or one or more DCI formats with carrier indication, and when these PUCCHs are scheduled in one slot, the following cases and UE operations may be considered as specific examples of implementation A6 and implementation A6-1. In some implementations, the following operations may be applied to the case of linking with PUCCH cell patterns configured semi-statically according to time through a dynamic PUCCH carrier switching/indicating operation of DCI.
* Option 1: when one of a plurality of (e.g., two, three, or four) candidate cells can be indicated by a PUCCH carrier indicator of DCI, if at least one or more DCIs including the PUCCH carrier indicator are received among DCIs scheduling one or more (e.g., a plurality of) PUCCHs, the UE performs PUCCH transmission on the indicated cell. On the other hand, if no DCI including a PUCCH carrier indicator is received among DCIs scheduling one or more (e.g., a plurality of) PUCCHs (e.g., if PUCCH transmission is scheduled using only a DCI format (e.g., DCI format 1_0) without carrier indication), the UE performs PUCCH transmission on a cell determined according to a PUCCH cell pattern semi-statically configured over time. One of the candidate cells may be configured as a Pcell or PUCCH Scell.
* Option 2: in the case where one of one or more (e.g., one, two, or three) candidate cells is indicated through DCI or a specific state (e.g., "no handover state" in implementation A6) corresponding to "no cell indication" or "following a semi-static pattern" can be indicated, if at least one or more DCIs indicating a specific cell (including a PUCCH cell indicator) is received among DCIs scheduling one or more (e.g., multiple) PUCCHs, the UE performs PUCCH transmission on the indicated cell. On the other hand, if no DCI indicating a specific cell (including a PUCCH cell indicator) is received among DCIs scheduling one or more (e.g., a plurality of) PUCCHs (e.g., if PUCCH transmission is scheduled only with a DCI format (e.g., DCI format 1_0) without carrier indication or only with a DCI format indicating "no cell indication" or "following a semi-static pattern"), the UE performs PUCCH transmission on a cell determined according to a PUCCH cell pattern configured semi-statically according to time. One of the candidate cells may be configured as a Pcell or PUCCH Scell.
< implementation A7> different SCS between source carrier and target carrier
When the BS schedules PDSCH reception and PUCCH transmission for HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs, and when CCs to which PUCCH resources are to be transmitted may be dynamically switched (e.g., CCs to be used are indicated by L1 signaling (e.g., DCI), or may be different for respective PUCCH transmissions according to a predefined rule), the UE needs to determine a location of an UL slot to transmit PUCCH in order to transmit PUCCH on the determined CCs. When a plurality of CCs configured by the UE have different SCSs, in particular, when a source carrier to which PUCCH transmission is initially indicated/configured and a target carrier to which PUCCH transmission is dynamically switched have different SCSs, the following various problems may occur.
Problem 1: when the SCS of the source carrier is greater than that of the target carrier (i.e., the SCS of the target carrier is smaller than that of the source carrier), a plurality of source carrier slots may be associated with one target carrier slot, and PUCCH transmissions located in different slots of the source carrier need to be multiplexed to one target carrier.
Problem 2: when the SCS of the source carrier is smaller than that of the target carrier (i.e., the SCS of the target carrier is greater than that of the source carrier), one source carrier slot may be associated with a plurality of target carrier slots. In other words, this may require switching to the target carrier during the source carrier time slot.
As described above, in order to prevent these problems, first, PUCCH carrier switching may be limited to switching to carriers having the same SCS. However, since this makes switching performed between limited CCs, the influence of carrier switching may be small. Thus, in some implementations of the present disclosure, PUCCH carrier switching may be performed between CCs having different SCS using at least one of the following methods.
* To solve the problem 1, when the SCS of the source carrier is greater than that of the target carrier, the BS may not switch two or more PUCCHs (particularly, when PUCCHs are located in different slots of the source carrier and each switched PUCCH is located in one slot of the target carrier) to the target carrier. Thus, when the SCS of the source carrier is greater than that of the target carrier, the UE may not expect two or more PUCCHs to be switched (and multiplexed) to the target carrier.
* To solve the problem 2, the BS may prevent CC switching from occurring during a slot of the source carrier when the SCS of the source carrier is smaller than that of the target carrier. That is, the BS may always cause CC switching to occur only at the slot boundary of the source carrier. Thus, the UE may expect that no CC switching will occur during (e.g., in the middle of) a particular time slot. If the DCI is scheduled by the PDSCH instructing the UE to perform CC switching in the middle of any slot X of the source carrier, for example, if the UE is instructed/configured to perform any PUCCH or PUSCH transmission from the first symbol to the sixth symbol of slot X, after which PUCCH transmission is performed on another CC, the UE may not perform UL transmission in slot X. This operation may be limited to the case where DCI indicating a PUCCH transmission on another CC is received later than DCI indicating a UL transmission in slot X.
* To solve problem 2, cc switching may be limited to be performed only in a specific time unit. In other words, CCs that have been switched once may be maintained for a predetermined time unit, and switching to another CC may be performed at a boundary of each time unit. In this case, the predetermined time unit may be one slot length of the following reference SCS configuration or a slot length of the minimum SCS configuration among the following standards. For this operation, different standards may be used for each CC handover. For example, when the source carrier and the target carrier have the same SCS configuration, a specific standard may not be used, and when the source carrier and the target carrier have different SCS configurations, a standard such as standard 2 or standard 4 may be applied. As another example, when CC switching is indicated through DCI, standard 1 or standards 1 and 2 may be applied, and when CC switching is performed according to rules between CCs satisfying predetermined conditions (e.g., method a1_2/b1_2 of implementation A1/B1), CC switching may be performed using standard 2.
Standard 1: SCS configuration of PDCCH
Standard 2: minimum SCS configuration provided by sc-SpecificCarrierList of FrequencyinfoUL or FrequencyinfoUL-SIB as RRC configuration
Standard 3: SCS configuration of source carrier
Standard 4: minimum SCS configuration among enabled CCs
Standard 5: minimum SCS among configured CCs
Standard 5: minimum SCS between source carrier and target carrier
Standard 6: the minimum SCS configuration among candidate CCs for PUCCH carrier switching. The "candidate CC for PUCCH carrier switching" may be a candidate CC configured for PUCCH carrier switching or a candidate CC configured for PUCCH transmission. To use standard 6, the bs may configure RRC parameters indicating the CC set for the UE individually. The CC set may be CCs that may undergo PUCCH carrier switching, and the UE and the BS may perform PUCCH carrier switching only on the configured CC set.
Standard 7: SCS configuration of primary cell
As another example, to minimize the above-described problem, it is also considered to select a source slot or a target slot based on a source PUCCH resource. More specifically, when the BS schedules PDSCH reception and PUCCH transmission for HARQ-ACK response to PDSCH reception for a UE configured with a plurality of CCs, and when CCs that will transmit PUCCH resources may be dynamically switched, the UE may determine a location of an UL slot to transmit PUCCH on a CC determined in consideration of the following.
* The UE may perform PUCCH transmission in UL slots of a target carrier overlapping with source PUCCH resources (PUCCH resources initially used in the source carrier). When there are multiple UL slots of the target carrier overlapping the source PUCCH resource, one of the following may be considered.
UL slot/sub-slot of target carrier immediately after start of source PUCCH resource
UL slot/sub-slot of target carrier immediately before end of source PUCCH resource
UL slot/sub-slot of target carrier overlapping with first slot of source PUCCH resource
UL slot/sub-slot of target carrier overlapping with last symbol of source PUCCH resource
* The UE may perform PUCCH transmission in UL slots of a target carrier overlapping with a source UL slot (a slot to which a source PUCCH resource corresponding to a PUCCH resource initially used in the source carrier is allocated). When there are multiple UL slots of the target carrier overlapping the source UL slot, one of the following may be considered.
UL slot/sub-slot of target carrier immediately after start of source UL slot
UL slot/sub-slot of target carrier immediately before end of source UL slot
UL slot/sub-slot of target carrier overlapping with first symbol of source UL slot
UL slot/sub-slot of target carrier overlapping with last symbol of source UL slot
< implementation A8> codebook construction for switching UL carriers
When a UE configured with a plurality of CCs is indicated or configured to transmit UCI on a PUCCH through L1 signaling (e.g., DCI) or higher layer signaling of a BS, and when a CC to transmit PUCCH resources can be indicated by L1 signaling (e.g., DCI) of the BS or CCs to transmit PUCCH resources are determined through different methods according to respective PUCCHs, respective UCI types, and/or scheduling methods (semi-statically configured or dynamically scheduled), the UE needs to construct a HARQ-ACK codebook for HARQ-ACK PUCCHs to be transmitted on the determined CCs.
In some scenarios (e.g., NR Rel-16), in a type 1 codebook, a UE generates a HARA-ACK codebook by collecting associated HARQ-ACK information for each cell using a set of determined HARQ-ACK feedback timing values, for each HARQ-ACK feedback timing in each cell, for each DL slot in which PDSCH can be received at each HARQ-ACK feedback timing, and for each PDSCH occasion receivable in each DL slot. However, if CCs that will transmit PUCCH resources may become different each time, the following problem may occur when resources to be transmitted according to such an operation use a different set of HARQ-ACK feedback timing values or use a set of HARQ-ACK feedback timing values that is always determined regardless of the CC to be transmitted.
Problem 1: the PDSCH scheduled in one HARQ-ACK codebook may be scheduled by a set of different HARQ-ACK feedback timings.
Problem 2: the PUCCH may be scheduled by a different set of HARQ-ACK timing values than the set of HARQ-ACK feedback timing values configured in the CC to which HARQ-ACK information is to be transmitted.
In particular, these problems may increase when, for some PDSCH, PUCCH is scheduled by a set of HARQ-ACK feedback timing values configured for a dynamically indicated CC (i.e., target carrier) to transmit PUCCH, and when, for other PDSCH, the CC to transmit PUCCH is semi-statically determined by the configured pattern and PUCCH is scheduled by a set of HARQ-ACK feedback timing values that are always determined independent of the CC to transmit HARQ-ACK information. To solve this problem, a UE configured to use PUCCH carrier switching may configure a type 1HARQ-ACK codebook for a HARQ-ACK PUCCH on a CC to which PUCCH is to be transmitted, considering the following method.
* Method a8_1: to construct a type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values and SCS (or slot length based thereon) configured for CCs that will transmit a PUCCH including the corresponding codebook. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. When a PUCCH carrier of at least one PDSCH is dynamically indicated (e.g., as another carrier) (or when a dynamic PUCCH carrier switching/indication operation is semi-statically configured only by DCI without a PUCCH carrier pattern configured according to time), in other words, when a CC for which a PUCCH corresponding to at least one PDSCH is to be transmitted is indicated by L1 signaling, the method a8_1 may be used restrictively.
* Method A8_1-1: to construct the type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values configured for CCs that will transmit a PUCCH including a corresponding codebook and use SCS (or slot length based thereon) of a specific CC configuration determined for a predefined or higher layer signaling by the BS. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. In some implementations, the particular CC may be the primary cell. Alternatively, in some implementations, the particular CC may be a reference cell configured for carrier switching operations. As an example, in carrier switching operation, a reference cell configured to determine a set of HARQ-ACK feedback timing values, a slot length, and SCS for determining PDSCH to HARQ-ACK timing may be a specific CC. In some implementations, when the PUCCH carrier of the PDSCH is not dynamically indicated (e.g., as another carrier) (by DCI) (or when only PUCCH carrier patterns semi-statically configured according to time without separate configuration for dynamic PUCCH carrier switching/indication operation by DCI are configured), in other words, when L1 signaling does not indicate CCs for transmitting PUCCHs corresponding to the PDSCH, the method a8_1-1 may be used restrictively.
* Method a8_2: to construct a type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values and SCS (or slot length based thereon) configured for a specific CC that is predefined or determined through higher layer signaling of the BS. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. In some implementations, the particular CC may be the primary cell. Alternatively, in some implementations, the particular CC may be a reference cell configuration for carrier switching operations. As an example, in carrier switching operation, a reference cell configured to determine a set of HARQ-ACK feedback timing values, a slot length, and SCS for determining PDSCH to HARQ-ACK timing may be a specific CC. In some implementations, SCS of a particular CC may be used to apply HARQ-ACK feedback timing. In some implementations, when not dynamically referred to (via DCI)The method a8_2 may be used restrictively when a PUCCH carrier of PDSCH is shown (e.g., as another carrier) (or when only a PUCCH carrier pattern semi-statically configured according to time without separate configuration for dynamic PUCCH carrier switching/indication operation by DCI is configured), in other words, when L1 signaling does not indicate a CC for transmitting a PUCCH corresponding to PDSCH. As another example, SCS of the CC that will transmit PUCCH may be used to apply HARQ-ACK feedback timing. In this case, the set of HARQ-ACK feedback timing values of CCs to transmit the PUCCH may be limited to include HARQ-ACK feedback timing when scheduling the PUCCH using SCS of a specific CC and the set of HARQ-ACK feedback timing values. For example, when scheduling is performed based on a set of SCS and HARQ-ACK feedback timing values of a specific CC, if DL slot n can be used D To UL slot n U +k performs scheduling (i.e., when PDSCH is received in DL slot n D End of middle UL slot n U And DL slot n D Associated and for the time slot n in DL D HARQ-ACK response for medium-end PDSCH reception may be at UL slot n with HARQ-ACK feedback timing k U +k), the HARQ-ACK feedback timing value of the CC may be configured such that even the set of HARQ-ACK timing values of the CC through which the PUCCH is to be transmitted may be based on the time slot n in DL D Scheduling UL slot n for PDSCH ending reception in U PUCCH transmission of +k.
< implementation A9> PDSCH processing margin for PUCCH carrier switching
When the UE performs transmission on a PUCCH carrier different from the PUCCH carrier used in the previous PUCCH transmission, the UE may require additional time to newly configure the operation of the radio transmitter. To guarantee the required time, the UE may report additional required time caused by the PUCCH carrier switching operation to the BS through the UE capability report signaling, and the BS may perform PDSCH scheduling in consideration of information reported by the UE. For example, the UE may report a processing margin PUCCHSwitchingMargin (us) as UE capability, and the BS may perform PDSCH scheduling in consideration of PUCCHSwitchingMargin as follows. E.g. assigned HARQ-ACK timing K 1 And the effect defined by the PUCCH resource to be used and including timing advance if the first UL symbol of PUCCH carrying HARQ-ACK information is no earlier than symbol L 1 Starting in the symbols of (1), the UE provides an active HARQ-ACK message, where L 1 Is defined as having T after the end of the last symbol of PDSCH carrying an acknowledgement transport block proc,1＝ (N 1 +d 1 +d 2 )*(2048+144)*κ*2 -u *T c +T ext+ T PUCCHswitch The next UL symbol of the CP that starts thereafter. Here, N 1 、d 1 、d 2 、κ*2 -u Tc and T ext Defined in clause 5.3 of 3gpp TS 38.213.
When configuring PUCCHSswitchingMargin for UE, T PUCCHSwithch The value of (2) is equal to the processing margin given by pucchhswitchingmargin.
In some implementations, the processing margin may be applied restrictively when a transmission is performed on a PUCCH carrier different from a PUCCH carrier used in a previous PUCCH transmission. In other words, when the same PUCCH carrier as that used in the previous PUCCH transmission is used, T PUCCHSwithch ＝0。
In some implementations, the processing margin may be applied restrictively when transmissions are performed on a PUCCH carrier that is different from the UL carrier used in the previous UL transmission. In other words, when the same PUCCH carrier as that used in the previous UL transmission is used, T PUCCHSwithch ＝0。
In some implementations, the processing margin may be limited to the case where PUCCH carrier switching is dynamically performed, for example, the case where PUCCH carriers are switched by scheduling PUCCH carrier indications included in DCI. This is because, when the PUCCH carrier is semi-statically switched, the UE may pre-switch the UL carrier before scheduling the PUCCH. In other words, when configuring PUCCH carrier switching for UE to be performed in a semi-statically given UL CC pattern, T PUCCHSwithch ＝0。
In some implementations, each pair of CCs available to the UE reports PUCCHSwitchingMargin. When a UE is handed over from CC A to CC B, or when it is handed over from CC B to CC A, the value of PUCCHSswitchingMargin associated with a pair of CC A and B may be used as T PUCCHSwithch 。
In some implementations, individual UL CC reports may be available for a UEPUCCHSswitchingMargin. This is to assume that PUCCH carrier switching is always on the primary cell. That is, if there is no separate indication of the PUCCH carrier, the UE may transmit PUCCH on the primary cell and assume T PUCCHSwithch =0. If a PUCCH carrier to be used is indicated, the UE may use the value of PUCCHSswitchingMargin associated with that carrier as T PUCCHSwithch 。
Alternatively, as another example, the UE may report the processing margin PUCCHSwitchingSymbolMargin as UE capability in symbol units, and the BS may perform PDSCH scheduling in consideration of pucchchswitchingsymbolmargin as follows. E.g. assigned HARQ-ACK timing K 1 And the effect defined by the PUCCH resource to be used and including timing advance if the first UL symbol of PUCCH carrying HARQ-ACK information is no earlier than symbol L 1 Starting in the symbols of (1), the UE provides an active HARQ-ACK message, where L 1 Is defined as having T after the end of the last symbol of PDSCH carrying an acknowledgement transport block proc,1＝ (N 1 +d 1 +d 2 )*(2048+144)*κ*2 -u *T c +T ext The next UL symbol of the CP that starts thereafter. Here, N 1 、d 1 、d 2 、κ*2 -u Tc and T ext Defined in clause 5.3 of 3gpp TS 38.213.
D when configuring PUCCHSswitchingSymbolMargin for UE 3 The value of (2) is equal to the processing margin given by PUCCHSswitchingSymbolMargin.
In some implementations, the processing margin may be applied restrictively when a transmission is performed on a PUCCH carrier different from a PUCCH carrier used in a previous PUCCH transmission. In other words, when the same PUCCH carrier as the PUCCH carrier of the previous PUCCH transmission is used, d 3 =0, otherwise d 3 >0。
In some implementations, the processing margin may be applied restrictively when transmissions are performed on a PUCCH carrier that is different from the UL carrier used in the previous UL transmission. In other words, when the same PUCCH carrier as the PUCCH carrier of the previous UL transmission is used, d 3 =0, otherwise d 3 >0。
In some implementationsThe processing margin may be limited to a case where PUCCH carrier switching is dynamically performed, for example, a case where PUCCH carrier switching is performed by scheduling PUCCH carrier indications included in DCI. This is because, when the PUCCH carrier is semi-statically switched, the UE may pre-switch the UL carrier before scheduling the PUCCH. In other words, d when configuring PUCCH carrier switching for UE to be performed in semi-statically given UL CC pattern 3 ＝0。
In some implementations, each pair of CCs available to the UE reports PUCCHSwitchingSymbolMargin. When a UE switches from CC A to CC B or from CC B to CC A, the value of PUCCHSswitching SymbolMargin associated with a pair of CC A and B may be used as d 3 。
In some implementations, PUCCHSwitchingSymbolMargin may be reported for each UL CC available to the UE. This is to assume that PUCCH carrier switching is always on the primary cell. That is, if there is no separate indication of the PUCCH carrier, the UE may transmit PUCCH on the primary cell and assume d 3 =0. When a PUCCH carrier to be used is indicated, the value of pucchhswitchingmargin associated with that carrier may be used as d 3 。
BS side
Hereinafter, the above-described implementation of the present disclosure will be described again from the perspective of the BS. Fig. 17 illustrates an example of an operational flow of a BS according to some implementations of the disclosure.
In some implementations, the BS may send a cell configuration to a UE that has accessed the BS and provide available CC information through the cell configuration. For example, the BS may provide RRC configuration including CC information (e.g., servingCellConfigCommon) to the UE through RRC signaling. The BS may send MAC CE messages to the UE to enable or disable various carriers (also referred to as cells). When the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to PDSCH transmission for the UE (S1701), the BS may (dynamically) select a carrier (i.e., PUCCH cell) to receive PUCCH for HARQ-ACK response using some implementations of the present disclosure (S1703). The BS may receive UCI on PUCCH resources to be used in a corresponding carrier using some implementations of the present specification (S1705).
In some implementations of the present disclosure, the following BS operations may be considered.
< implementation B1> how to select CC for PUCCH transmission
When the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to the PDSCH transmission for a UE configured with a plurality of CCs or when the BS instructs or configures the UE to transmit UCI through L1 signaling (e.g., DCI) or higher layer signaling (e.g., RRC signaling) of the BS, the BS may assume that the UE will select a carrier to transmit PUCCH according to at least one of the following methods. The BS may determine a carrier that will receive the PUCCH from the UE according to one of the following methods based on such an assumption.
* Method b1_1: the UE may select a PUCCH carrier (i.e., PUCCH cell) based on a data field included in a scheduling message (e.g., DL assignment) of the DCI. As an example, DCI scheduling PDSCH may include a PUCCH carrier indicator field, and UE may select a PUCCH carrier having the same cell index as the value of the PUCCH carrier indicator field to transmit HARQ-ACK response for PDSCH using the PUCCH carrier.
* Method b1_2: the UE and the BS may select CCs to be used for PUCCH transmission according to predetermined conditions and rules so that the UE and the BS may select and assume the same cell without separate signaling. More specifically, the UE and the BS may select CCs to be used for PUCCH transmission from among CCs satisfying a predetermined condition according to a rule. This may be expressed such that the UE and the BS select one CC located at the top of the ordered list of CCs according to conditions. For example, the UE and the BS may configure an ordered list of CCs according to a first rule, and transmit a HARQ-ACK response for the scheduled PDSCH by selecting a CC at the top of the list from among CCs prioritized by a second rule. The UE and the BS may unambiguously always assume the same CC as long as the first rule and the second rule are based on semi-statically configured values. In other words, the UE may preferentially select a specific CC according to a specific condition and transmit a PUCCH on the corresponding CC.
In configuring the ordered list of CCs, at least one of the following rules may be used as the first rule.
Rule b1_1-1: the CCs are arranged in ascending order of cell index. That is, the CC with the low cell index is located at the upper side of the list.
Rule b1_1-2: CCs that do not include a particular configuration may be excluded from the list or located lower in the list than CCs that include a particular configuration. For example, unconfigured licensed PUSCH configured or periodic or semi-persistent CSI configured CCs may be excluded from the list. This serves to prevent UL transmissions of the UE from being abandoned.
Rule b1_1-3: the non-activated CCs may be excluded from the list or located lower in the list than the activated CCs.
Rule b1_1-4: CCs that do not have SCS equal to or greater than UL BWP of the CC receiving the scheduled PDSCH or CCs that are equal to or greater than SCS of the primary cell of the PUCCH group receiving the PDSCH (i.e., CCs of SCS less than SCS of UL BWP of the CC receiving the scheduled PDSCH) may be excluded from the list or may be located at a lower position in the list than other CCs.
Rule b1_1-5: CCs that do not have SCS equal to UL BWP of the CC receiving the scheduled PDSCH or SCS equal to SCS of the primary cell of the PUCCH group receiving the PDSCH (i.e., CCs of SCS less than SCS of UL BWP of the CC receiving the scheduled PDSCH) may be excluded from the list or may be located at a lower position in the list than other CCs.
Rule b1_1-6: when symbols of PUCCH resources to transmit HARQ-ACK responses for the scheduled PDSCH (or PUCCH resources to which all UCI in a slot to transmit a corresponding HARQ-ACK response is multiplexed/transmitted) are not indicated as UL or flexible symbols in a slot format configured for a particular cell (i.e., when at least one symbol of the PUCCH resources is indicated as DL symbol), the corresponding cell may be excluded from the list or located at a lower position in the list than other CCs. It may be a great burden for the UE and the BS to consider slot formats, PUCCH resource sets, and PUCCH payloads of all CCs of each PUCCH transmission. One of the following rules may be considered in place of the rule b1_1-6 to consider the slot format for carrier switching while minimizing the burden on the UE and BS.
Substitution rule B1_1-6-1: when a slot for transmitting a HARQ-ACK response for the scheduled PDSCH includes a DL slot in a slot format configured for a particular cell, the corresponding cell may be excluded from the list or located lower than other CCs in the list.
Substitution rule B1_1-6-2: when a starting symbol of a PUCCH transmitting a HARQ-ACK response for the scheduled PDSCH is not indicated as a UL symbol in a slot format configured for a particular cell, the corresponding cell may be excluded from the list or located lower than other CCs in the list.
Rule b1_1-7: when there is no PUCCH resource set having a maximum payload size greater than the total bit size (i.e., number of bits) of the HARQ-ACK response for the scheduled PDSCH and UCI that may be transmitted together with the HARQ-ACK response, the corresponding cell may be excluded from the list or may be located lower than other CCs in the list.
Rule b1_1-8: the dormant BWP-enabled CCs may be excluded from the list or may be located lower in the list than other CCs. In the present disclosure, the dormant BWP is one of DL BWP and is configured by the network through dedicated RRC signaling. In dormant BWP, the UE stops PDCCH monitoring for Scell, but continues to perform CSI measurement, automatic gain control (ACG), and beam management (when configured). For each serving cell other than SpCell or PUCCH SCell, the network may configure one BWP as a dormant BWP.
At least one of the following rules may be used as the second rule when selecting one CC from the ordered list of CCs.
Rule b1_2-1: the UE preferentially selects CCs with lower cell indexes. Rule B1_2-1 may be applied last. That is, the UE may select the CC having the lowest cell index when another second rule does not exist in the list or when a plurality of CCs satisfy the second rule.
Rule b1_2-2: the UE may prefer to only select CCs that include a particular configuration. For example, the UE may prefer CCs with a configured licensed PUSCH configuration or periodic or semi-persistent CSI configuration. This serves to prevent UL transmissions of the UE from being abandoned.
Rule b1_2-3: the UE may prefer an enabled CC.
Rule b1_2-4: the UE may preferentially select SCS equal to or greater than UL BWP of the CC receiving the scheduled PDSCH or CC equal to or greater than SCS of the primary cell of the PUCCH group receiving the PDSCH.
Rule b1_2-5: the UE may preferentially select CCs having the same SCS as SCS of UL BWP of the CC receiving the scheduled PDSCH or SCS of the primary cell of the PUCCH group receiving the PDSCH.
Rule b1_2-6: when PUCCH resources to transmit HARQ-ACK responses for the scheduled PDSCH (or PUCCH resources to which all UCI in a slot to transmit a corresponding HARQ-ACK response is multiplexed/transmitted) are indicated as UL or flexible symbols in a slot format configured for a particular cell (i.e., when at least one symbol of the PUCCH resources is not indicated as DL symbol), the UE may preferentially select the corresponding cell. It may be a great burden for the UE and the BS to consider slot formats, PUCCH resource sets, and PUCCH payloads of all CCs of each PUCCH transmission. One of the following rules may be considered in place of the rule b1_2-6 to consider the slot format for carrier switching while minimizing the burden on the UE and BS.
Substitution rule B1_2-6-1: when a slot in which a HARQ-ACK response for the scheduled PDSCH is to be transmitted does not include a DL slot in a slot format configured for a specific cell, the UE may preferentially select the corresponding cell.
Substitution rule B1_2-6-2: when a starting symbol of a PUCCH transmitting a HARQ-ACK response for the scheduled PDSCH is indicated as a UL slot in a slot format configured for a specific cell, the UE may preferentially select the corresponding cell.
Rule b1_2-7: when there is a PUCCH resource set having a maximum payload size greater than a total bit size of a HARQ-ACK response to the scheduled PDSCH and UCI that may be transmitted together with the HARQ-ACK response, the UE may preferentially select a corresponding cell.
Rule b1_2-8: the UE may prefer CCs that do not enable dormant BWP.
A simple example of the method b1_2 based on the rule expression described above can be as follows.
The UE may configure an ordered list of enabled CCs using rules b1_1-1 and b1_1-3 and select the CC at the top of the list to transmit PUCCH. That is, the UE may transmit the PUCCH on the CC having the lowest index among the enabled CCs through the method b1_2.
The UE may configure an ordered list of enabled CCs using rule b1_1-3 and select the CC with the lowest cell index to transmit PUCCH using rule b1_2-1. That is, the UE may transmit the PUCCH on the CC having the lowest index among the enabled CCs through the method b1_2.
In some implementations of the present disclosure, the dormant BWP may be a BWP having a BWP ID equal to a value of dormantBWP-ID indicated by RRC signaling.
In some implementations of the disclosure, the BS may separately provide the UE with RRC parameters indicating the CC set. The CC set may indicate CCs (i.e., cells) that may be subject to PUCCH carrier switching. The UE and the BS may perform PUCCH carrier switching restrictively for the configured CC set.
For example, the BS may configure the UE with RRC parameters indicating the set of CCs available according to time. The CC set may indicate CCs that may be subject to PUCCH carrier switching. The UE and the BS may perform PUCCH carrier switching restrictively within the configured CC set. In this case, the following can be considered.
The PUCCH carrier switching pattern may be configured for the UE through higher layer signaling of the BS. The PUCCH carrier switching pattern may mean information to list a list including one or more available UL CCs in order according to a specific time unit (e.g., several slots) within a specific time period (e.g., several tens of slots, one frame, or 10 ms). To indicate that the list of available UL CCs occupies a specific time unit, a time length T may be included in each list L . Length of time T L The time taken by the corresponding list may be meant. In this case, the period of the PUCCH carrier switching pattern may be the time length T of the available UL CC list L Is a sum of (a) and (b). For example, there may be a specific UL CC list l1= { C1, C2, C3}, and time information T may be additionally assigned to the list L1 L . For example, l1= { { C1, C2, C3}, T may be provided L }. In this case, it may be at time T L During which at least one of C1, C2 or C3 is used. These lists may be enumerated sequentially. For example, if the list is given as { L1, L2, L3,..ln }, the sum of the time lengths T of the respective lists LN may represent the length of the entire pattern. In some implementations, information indicating that PUCCH carrier switching is not performed for a specific duration may also be included in the one or more patterns. This information can also be represented as a list of UL CCs including individual RRC parameters (e.g., nopucc hcarrierswitching). The BS may assume that the UE does not perform PUC for a duration including such informationCH carrier switching. The time unit or the slot length (i.e., the time length per slot) may be determined by UL SCS configuration configured in the cell. For example, at least one of the following may be considered.
A separate UL reference SCS of PUCCH carrier switching pattern may be configured, and a time unit may be determined by a corresponding SCS value.
The time unit may be determined by the maximum or minimum SCS among SCSs of UL BWP configured for the UE.
The time units may be determined by a configurable maximum or minimum SCS in the cell. As an example, the time units may be determined by the minimum or maximum SCS configuration u provided by the freefinul or SCS-specificcarrier list of the freefinul-SIB.
When the length of one frame is 10ms, the slot length of u according to each SCS configuration can be determined according to table 1.
For example, in some implementations, PUCCH carrier switching may be performed only when at least one symbol of a PUCCH resource (or PUCCH resource where all UCI in a slot where HARQ-ACK response is to be transmitted is multiplexed/transmitted) to which HARQ-ACK response for a scheduled PDSCH is to be transmitted (prior to PUCCH carrier switching) is indicated as a DL symbol in a slot format configured for a primary cell (e.g., at least one symbol of PUCCH is indicated as DL by tdd-UL-DL-configuration command or tdd-ULDL-configuration-configured).
As another example, in some implementations, PUCCH carrier switching may be performed only when at least one symbol of a PUCCH resource (in a reference cell) to transmit a HARQ-ACK response for a scheduled PDSCH (or a PUCCH resource to which all UCI in a slot in which the HARQ-ACK response is multiplexed/transmitted) is indicated as a DL symbol in a slot format of the reference cell (e.g., at least one symbol of a PUCCH is indicated as DL by tdd-UL-DL-configuration command or tdd-ULDL-configuration-configured). The reference cell may be determined in consideration of the following.
A primary cell is used as a reference cell;
A cell index configured by higher layer signaling of the BS indicates a reference cell; or alternatively
The CC with the lowest cell index among the CC set for PUCCH carrier switching is used as the reference cell.
In implementation B1, HARQ-ACK PUCCH corresponding to PDSCH reception has been assumed for PUCCH. However, implementation B1 may not be limited to HARQ-ACK PUCCH, and implementation B1 and the implementations to be described may also be applied to PUCCHs carrying any type of UCI (e.g., HARQ-ACK, SR, or CSI). In particular, when PUCCH transmission is indicated through L1 signaling of the BS, the method b1_1 and/or the method b1_2 of the implementation B1 may be applied. When PUCCH transmission is indicated through higher layer signaling of the BS, the method b1_2 of implementation B1 may be applied.
< implementation B2> how to determine PUCCH resources for carrier switching
When the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to the PDSCH transmission for a UE configured with a plurality of CCs, the BS may assume that the UE will determine PUCCH resources on a carrier on which PUCCH is to be transmitted based on one of the following methods. The BS may determine PUCCH resources on a carrier on which PUCCH will be received from the UE according to one of the following methods based on such an assumption.
* Method b2_1: (PUCCH resource configuration in scheduling CC) the UE and the BS may select PUCCH resources using a PUCCH resource set list configured in a cell scheduling PDSCH (i.e. a cell receiving PDSCH). By the method b2_1, the ue and the BS can assume that one PUCCH resource set list will be used regardless of the CC to be selected. This may make it easy to consider the slot format in CC selection.
* Method b2_2: (PUCCH resource configuration in primary CC) the UE and the BS may select PUCCH resources using a PUCCH resource set list configured in a primary cell of a PUCCH group of the scheduled PDSCH. By the method b2_2, the ue and the BS can assume that the same PUCCH resource will always be used regardless of the CC to be selected. This may make it easy to consider the slot format in CC selection.
* Method b2_3: (PUCCH resource configuration in target CC) the UE and the BS may select PUCCH resources using a PUCCH resource set list configured in a cell to transmit the HARQ-ACK response. The cell to send the HARQ-ACK response may be determined using implementation A1/B1 or similar methods. This may bring scheduling flexibility by allowing the BS to configure appropriate PUCCH resources for each CC transmitting PUCCH.
* Method b2_4: (dedicated PUCCH resources for PUCCH carrier switching) when a cell to transmit PUCCH is explicitly indicated or can be explicitly indicated in a PDSCH scheduling message, or when PUCCH is to be transmitted in a cell other than the primary cell according to a predefined rule, the UE and the BS may select PUCCH resources using a separate PUCCH resource set list configured by the BS. In other words, when the PUCCH carriers are (dynamically) switched according to time, the BS may individually configure PUCCH resource configurations to be used for the UE.
The methods b2_1, b2_2, and/or b2_3 represent that the BS may configure the UE with a PUCCH resource set and PUCCH resources available for PUCCH carrier switching for each CC that the UE may use for UL transmission, in particular for PUCCH transmission. The PUCCH resource sets and PUCCH resources may be values that are otherwise configured within a conventional PUCCH resource configuration (e.g., PUCCH resource configuration according to 3GPP TS 38.331Rel-16), and each PUCCH resource set and each PUCCH resource may have a particular index range.
< implementation B3> how to determine PDSCH-to-HARQ-ACK feedback timing for PUCCH carrier switching
When the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to the PDSCH transmission for a UE configured with a plurality of CCs, and when the CC for which PUCCH resources are to be transmitted is (dynamically) switchable (e.g., when the CC to be used is indicated by L1 signaling (e.g., DCI) or may vary with each PUCCH transmission according to a predefined rule), the BS needs to determine the location of the UL slot in which PUCCH is to be received in order for the UE to receive PUCCH on the determined CC. In some implementations, the predefined rule may include a PUCCH carrier switching pattern provided by higher layer signaling of the BS. The location of the UL slot may be determined through a set of pre-configured HARQ-ACK feedback timing values and a data field of a scheduling message indicating a value to be used in the set based on a slot in which the last PDSCH is transmitted.
Fig. 18 illustrates a process of determining slots for PUCCH reception in some implementations of the present disclosure.
Referring to fig. 18, the bs may transmit a PDSCH to the UE based on scheduling information provided to the UE (S1801). The BS may assume that the UE determines a set of HARQ-ACK feedback timing values to be used to determine a position of a UL slot of a PUCCH transmission related to the PDSCH by at least one of the following methods. According to this assumption, the BS may determine a set of HARQ-ACK feedback timing values to be used to determine a position of an UL slot to receive a PUCCH from the UE by at least one of the following methods.
* Method b3a_1: the (K1 set in the scheduling CC) BS and UE may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for a cell scheduling PDSCH (i.e., a cell receiving PDSCH). For example, when the BS transmits DCI format 1_1 to the UE and transmits PDSCH to the UE based on DCI format 1_1, the BS may determine HARQ-ACK feedback timing value K of the PDSCH among HARQ-ACK feedback timing values provided through dl-DataToUL-ACK of a cell transmitting the PDSCH and determine PUCCH slots using the determined HARQ-ACK timing value K. By method B3a-1, the bs may assume that the set of HARQ-ACK feedback timing values will be used irrespective of the CC that the UE is to select for PUCCH transmission, which may make it easy to consider slot format in CC selection. In other words, according to the method B3a-1, since the HARQ-ACK feedback timing value is not changed even when PUCCH carrier switching occurs, the slot format of each CC can be accurately designated before CC selection.
* Method b3a_2: the (K1 set in the primary CC) BS and UE may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for the primary cell of the PUCCH group for scheduling PDSCH. For example, if a PUCCH group for a BS scheduling PDSCH for a UE is MCG, the BS may determine HARQ-ACK feedback timing value K for the PDSCH based on a set of HARQ-ACK feedback timing values configured for the Pcell. If the PUCCH group of the scheduled PDSCH is SCG, the BS may determine the HARQ-ACK feedback timing value K of the PDSCH based on the set of HARQ-ACK feedback timing values configured for the PSCell. If the PUCCH group of the scheduled PDSCH is the primary PUCCH group, the BS may determine the HARQ-ACK feedback timing value K of the PDSCH based on the set of HARQ-ACK feedback timing values configured for the Pcell. If the PUCCH group of the scheduled PDSCH is a secondary PUCCH group, the BS may determine the HARQ-ACK feedback timing value K of the PDSCH based on a set of HARQ-ACK feedback timing values configured for the PUCCH-SCell of the secondary PUCCH group. By the method b3a_2, the bs can assume that the same set of HARQ-ACK feedback timing values will always be used irrespective of the CC that the UE will select for PUCCH transmission, which can make it easy to consider slot format in CC selection. In other words, according to the method B3a-2, since the HARQ-ACK feedback timing value is not changed even when PUCCH carrier switching occurs, the slot format of each CC can be accurately designated before CC selection.
* Method b3a_3: the UE (set in the target CC of K1) may select PUCCH resources using a set of HARQ-ACK feedback timing values (e.g., dl-DataToUL-ACK-r16, or dl-DataToUL-ACK-DCI-1-2-r 16) configured for the cell to which the HARQ-ACK response is to be transmitted.
* Method b3a_4: (dedicated K1 set for PUCCH carrier switching) when a cell to transmit PUCCH is explicitly indicated or can be explicitly indicated by a PDSCH scheduling message or when PUCCH is to be transmitted in a cell other than the primary cell according to a predefined rule, the UE may select PUCCH resources using a set of HARQ-ACK feedback values configured separately by the BS for PUCCH cell switching. The BS may individually configure a set of HARQ-ACK feedback timing values for the UE to use when dynamically switching PUCCH carriers.
The UE may determine HARQ-ACK feedback timing of the corresponding PDSCH based on the determined set of HARQ-ACK feedback timing values according to one of the methods b3a_1 to b3a_4 (S1803). For example, when a PDSCH-to-harq_feedback timing indicator included in DCI including a PDSCH, the BS may determine a HARQ-ACK feedback timing value K indicated to the UE through the PDSCH-to-harq_feedback timing indicator among the determined set of HARQ-ACK timing values. When the PDSCH-to-harq_feedback timing indicator is 2 bits, if the value of the PDSCH-to-harq_feedback timing indicator is "00", the first value of the HARQ-ACK timing values in the determined set may be determined as the HARQ-ACK feedback timing value K. If the value of the PDSCH-to-harq_feedback timing indicator is "01", the second value of the HARQ-ACK timing value in the determined set may be determined as HARQ-ACK feedback timing value K. The HARQ-ACK feedback timing K, from which slot to apply to which cell, is questionable.
In accordance with the HARQ-ACK feedback timing determined based on the set of HARQ-ACK feedback timing values determined according to one of the methods b3a_1 to b3a_4, the BS may identify a slot (e.g., UL in TDD) in which the PUCCH is to be transmitted, based on one of the following methods, for example, a DL slot in which the PDSCH transmission ends, a last UL slot overlapping the DL slot among slots of the primary cell, or a last UL slot overlapping the PDSCH transmission among slots of the target cell in which the PUCCH transmission is to be performed (S1805).
* Method b3b_1: (time slots counted in scheduling CC) when a time slot including transmission end timing of PDSCH is time slot n and the determined HARQ-ACK timing value is K on a cell scheduling PDSCH (i.e., a cell receiving PDSCH), the BS may receive PUCCH in time slot m of a cell that will transmit a HARQ-ACK response that may represent time slot n (i.e., a HARQ-ACK response including a result of PDSCH reception performed in time slot n). Here, the slot m may be one of the following slots:
-UL slots including the entire slot n+k of the cell that will send HARQ-ACK responses;
UL slots including start timing of slot n+k of a cell that will transmit HARQ-ACK response (refer to (a) of fig. 16);
-UL slots including the end timing of slot n+k for the cell that will send the HARQ-ACK response.
* Method b3b_2: (time slots counted in the primary CC) when a time slot including the transmission end timing of the PDSCH is time slot n and the determined HARQ-ACK timing value is K on the primary cell of the PUCCH group on which the PDSCH is scheduled, the BS may receive the PUCCH in time slot m of the cell where the HARQ-ACK response that may represent time slot n (i.e., the HARQ-ACK response including the result of PDSCH reception performed in time slot n) is to be transmitted. Here, the slot m may be one of the following slots:
-UL slots including the entire slot n+k of the cell that will send HARQ-ACK responses;
UL slots including start timing of slot n+k of a cell that will transmit HARQ-ACK response (refer to (b) of fig. 16);
-UL slots including the end timing of slot n+k for the cell that will send the HARQ-ACK response.
* Method B3: (slots counted in target CC) when a (UL) slot including transmission end timing of PDSCH is slot n and the determined HARQ-ACK timing value is K on a cell to which HARQ-ACK response is to be transmitted, the BS may receive PUCCH in slot n+k (refer to (c) of fig. 16).
The method b3b_1 or the method b3b_2 may deterministically determine the HARQ transmission timing of the UE by counting HARQ-ACK feedback timings using the same method for each cell or each PUCCH group, and may have an advantage of ensuring a time required for the UE to prepare PUCCH transmission in advance.
Since processing is always performed based on the target CC even when the CC is scheduled as the target CC, the method b3b_3 allows all PUCCHs to be processed in the same manner from the perspective of one cell, thereby reducing implementation complexity of the UE.
< implementation B4> processing of PUCCH transmission without carrier indication
If the BS indicates or configures a UE configured with a plurality of CCs through L1 signaling or higher layer signaling to transmit UCI on PUCCH, and if a CC to which PUCCH resources are to be transmitted can be indicated by L1 signaling (e.g., DCI) provided by the BS, the BS may assume that the UE will select a CC to which PUCCH is to be transmitted using one of the following methods for PUCCH resources that the BS does not indicate through L1 signaling (e.g., periodic CSI, SPS, or HARQ-ACK to PDSCH).
* Method b4_1: the UE follows the last PUCCH carrier indication (e.g., an indicator for determining the CC to transmit the PUCCH) provided by the BS. That is, after explicitly indicating the CC transmitting the PUCCH, PUCCH transmission is performed on the indicated CC for all PUCCHs transmitted by the UE.
* Method b4_2: in the case of a PUCCH indicating a carrier to transmit the PUCCH, the UE determines a CC to transmit the PUCCH according to the indication, and for other PUCCHs, the UE selects a CC to transmit the PUCCH on the assumption that there is no indicator.
* Method b4_2-1: if the PUCCH resource X not indicated by the L1 signaling overlaps in time with the PUCCH Y of the CC a indicating the PUCCH resource to be transmitted, the UE may transmit the PUCCH resource X on the CC a by multiplexing the PUCCH resource X with the PUCCH Y.
* Method b4_2-2: if the PUCCH resource X not indicated by the L1 signaling overlaps in time with the PUCCH Y indicating the CC a to transmit the PUCCH resource, the UE may transmit the PUCCH X and the PUCCH Y on the corresponding CC. That is, PUCCH X may be transmitted on a CC selected by assuming that no indicator exists, and PUCCH Y may be transmitted on CC a. The UE may send information about whether such operation is available to the BS through an RRC message in the form of a UE capability report. The BS may configure the use of the corresponding operation for the UE capable of performing such operation through the RRC message. Only when the UE is configured to use the corresponding operation, the UE may process the PUCCH transmission overlapping in time through the method b4_2-2.
< implementation B5> processing for repetition of PUCCH carrier switching
When the BS instructs or configures a UE configured with a plurality of CCs to transmit UCI on a PUCCH through L1 signaling or higher layer signaling, and when the CC to transmit PUCCH resources can be instructed by L1 signaling (e.g., DCI) provided by the BS or the UE differently determines the CC to transmit PUCCH resources according to respective PUCCHs, respective UCI types, and/or scheduling methods (semi-statically configured or dynamically scheduled), two or more PUCCH transmissions may be instructed to be performed on different CCs. When these PUCCHs overlap in time, the BS may assume that the UE will select a CC that will transmit the PUCCH by at least one of the following methods.
* Method b5_1: for PUCCH transmissions overlapping each other, the UE follows a PUCCH carrier indication (i.e., an indicator for determining a CC to transmit the PUCCH) included in the last received DCI among the DCIs triggering the PUCCH transmissions.
* Method b5_2: for PUCCH transmissions overlapping each other, the UE may determine CCs on which to transmit (multiplexed) PUCCH based on PUCCH transmission having the earliest start timing of PUCCH resources.
* Method b5_3: for PUCCH transmissions overlapping each other, the UE may determine CCs on which to transmit (multiplexed) PUCCHs based on PUCCH resources indicated or configured to transmit HARQ-ACKs. When there are two or more PUCCH resources indicated or configured to transmit HARQ-ACK, the UE may determine CCs to transmit PUCCH based on a dynamically indicated PUCCH instead of a semi-statically configured PUCCH, and determine CCs to transmit PUCCH based on a PUCCH indicated later among the dynamically indicated PUCCHs.
* Method b5_4: when priorities are indicated or configured for the respective PUCCHs, the UE may determine CCs on which to transmit the PUCCHs based on PUCCHs having high priorities. When there are two or more PUCCHs having the same priority, the UE may determine CCs to transmit the PUCCHs using methods b5_1, b5_2, and/or b5_3 for the corresponding PUCCHs.
< implementation B6> dynamic PUCCH carrier indication
As described above, when the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to PDSCH transmission for a UE configured with a plurality of CCs or when the BS instructs or configures the UE to transmit UCI through L1 signaling or higher layer signaling provided by the BS, the BS may assume that the UE will select PUCCH carriers based on data fields included in a DCI-based scheduling message (e.g., DL assignment) (see method a1_1/b1_1 of implementation A1/B1). In other words, the UE may determine a CC that will transmit the HARQ-ACK PUCCH for the corresponding PDSCH by scheduling DCI of the PDSCH. In this case, at least one of the following methods may be considered as a method of scheduling DCI indicating CCs.
* Method b6_1: the DCI scheduling the PDSCH may include a PUCCH carrier indicator, and the UE/BS may select a PUCCH carrier having a cell index associated with a value of the PUCCH carrier indicator to transmit/receive a HARQ-ACK response to the PDSCH using the selected PUCCH carrier. The value of the PUCCH carrier indicator may be provided by a separate new DCI field or may be a value derived by re-interpreting some Most Significant Bits (MSBs) or Least Significant Bits (LSBs) of an existing DCI field.
* Method b6_2: when DCI of the scheduled PDSCH includes a PUCCH Resource Indicator (PRI) field and a value of the PRI field is associated with one PUCCH resource Identifier (ID) configured in any PUCCH resource set,
For each PUCCH resource ID, a CC that will transmit the PUCCH resource associated with the corresponding PUCCH resource ID may be configured, or
For each PUCCH resource set, CCs that will transmit PUCCH resources in the corresponding PUCCH resource set may be configured.
* Method b6_3: it is assumed that PUCCH carrier switching is performed when PUCCH indicated by DCI cannot be transmitted through TDD operation. In this case, the CC to be transmitted may be determined using the method of implementation A1/B1. When PUCCH carrier switching occurs, PUCCH resources may be determined based on PUCCH resources and PUCCH resource sets separately configured for PUCCH carrier switching.
* Method b6_4: one of the bit representations (e.g., all "1" s or all "0 s") that may be indicated by the PUCCH carrier indicator may be reserved as "no handover state". For example, when the "no handover state" is indicated, the UE/BS may perform PUCCH transmission/reception on the primary cell without performing PUCCH carrier handover. As another example, when the BS instructs the UE to semi-statically perform PUCCH carrier switching, for example, when the BS configures a PUCCH carrier pattern semi-statically according to time for the UE and instructs the UE to perform PUCCH carrier switching based on the pattern, if a value other than "no switching state" is indicated by the PUCCH carrier indicator, the UE and the BS may ignore the configured PUCCH carrier pattern and perform PUCCH transmission/reception by the indicated PUCCH carrier. In contrast, when the BS indicates "no handover state" to the UE through the PUCCH carrier indicator, the UE and the BS may select PUCCH resources based on the PUCCH carrier pattern (i.e., select PUCCH resources based on PUCCH resource configuration of a carrier selected according to the PUCCH carrier pattern) and perform PUCCH transmission/reception on the corresponding PUCCH carrier.
When using implementation A5/B5, the BS may assume that the UE does not perform PUCCH carrier switching when the UE transmits a HARQ-ACK response (SPS PDSCH HARQ-ACK response) for the SPS PDSCH, in particular, when the UE performs PUCCH transmission transmitting only SPS PDSCH HARQ-ACK. For example, when the enabling DCI of the SPS PDSCH indicates a CC that will transmit HARQ-ACK of the scheduled PDSCH, the UE may transmit PUCCH on the indicated CC for the PDSCH indicated by the DL assignment included in the enabling DCI, but thereafter may ignore the indicated CC for HARQ-ACK response to the PDSCH received through the configured DL assignment and transmit PUCCH on the CC determined according to 3GPP NR Rel-16.
< implementation B6-1> dynamic PUCCH scheduling with DCI without carrier indication
In using the implementation A6/B6, it is necessary to use different PDSCH-to-HARQ-ACK timing (i.e., HARQ-ACK feedback timing) according to the switched CCs as in the implementation A3/B3. However, some DCI formats (e.g., DCI formats such as DCI format 1_0) may not include a carrier indication field for carrier switching. For a UE configured to perform carrier switching, a DCI format without a carrier indication is scheduled, and a carrier to transmit PUCCH resources and PUCCH may be determined as follows.
* Method B6-1a_1: the BS and UE assume that PUCCH is scheduled on the primary cell. To select PUCCH resources, a set of PUCCH resources and a set of HARQ-ACK feedback timing values of the primary cell are used, and a slot length of the primary cell is used.
* Method B6-1a_2: when configuring a separate reference cell or reference SCS for a carrier switching operation, for example, when a set of HARQ-ACK feedback timing values, a slot length, and a reference cell of SCS used for determination of PDSCH-to-HARQ-ACK timing (i.e., HARQ-ACK feedback timing) are predefined or configured through higher layer signaling of the BS in the carrier switching operation, if PUCCH transmission is scheduled with a DCI format without carrier indication, the BS and UE use a PUCCH resource set of the reference cell and the set of HARQ-ACK feedback timing values and use the slot length of the reference cell in order to select PUCCH resources under the assumption that PUCCH is scheduled on the primary cell.
* Method B6-1a_3: when configuring a separate reference SCS for a carrier switching operation, for example, when a reference SCS for determining an SCS to be used in the carrier switching operation is predefined or configured through higher layer signaling of the BS, if PUCCH transmission is scheduled with a DCI format without carrier indication, the BS and the UE use a PUCCH resource set of a primary cell and a set of HARQ-ACK feedback timing values and use a slot length of the reference cell in order to select PUCCH resources under the assumption that PUCCH is scheduled on the primary cell.
* Method B6-1a_4: when the UE is instructed to semi-statically perform PUCCH carrier switching, for example, when a PUCCH carrier pattern semi-statically configured over time is configured for the UE and the UE is configured to perform PUCCH carrier switching based on the corresponding pattern, if PUCCH transmission is scheduled with a DCI format without carrier indication, the BS and the UE may select a PUCCH carrier based on the PUCCH carrier pattern and the UE performs PUCCH transmission on the corresponding PUCCH carrier. In contrast, if PUCCH transmission is scheduled for the UE using the DCI format with the carrier indication, the UE may ignore the configured PUCCH carrier pattern and perform PUCCH transmission on the PUCCH carrier indicated by the carrier indication.
When a plurality of PUCCHs are scheduled for a UE configured to perform carrier switching by one or more DCI formats without carrier indication and/or one or more DCI formats with carrier indication, and when the PUCCHs are scheduled in one slot, the BS and the UE may select CCs to transmit the PUCCHs by at least one of the following methods.
* Method B6-1b_1: the BS and UE assume that all overlapping PUCCH transmissions are sent on the same CC. In this case, PUCCHs scheduled through DCI formats without carrier indication may be transmitted on CCs indicated by scheduling of other PUCCHs overlapped therewith.
* Method B6-1b_2: the BS and the UE assume that PUCCHs scheduled with DCI formats without carrier indication are scheduled on the primary cell, and that all PUCCH transmissions overlapping each other will be transmitted on the same CC. In this case, the BS and the UE may assume that all other PUCCH scheduling overlapping with the PUCCH scheduled by the DCI format without carrier indication indicates the primary cell as the PUCCH cell.
* Method B6-1b_3: for PUCCH transmissions overlapping each other, the BS and the UE follow PUCCH carrier indications (i.e., indicators for determining CCs to transmit the PUCCH) included in the DCI finally provided among the DCIs triggering the PUCCH transmissions.
* Method B6-1b_4: suppose that a PUCCH scheduled with a DCI format without carrier indication is scheduled on a primary cell. For PUCCH transmissions overlapping each other, the BS and the UE assume that overlapping PUCCH transmissions are performed on a DCI scheduled UL CC that is finally provided among DCIs triggering PUCCH transmissions.
* Method B6-1b_5: it is assumed that PUCCHs scheduled with DCI formats without carrier indication are scheduled on a primary cell, and that all PUCCH transmissions overlapping each other by a BS and a UE will be transmitted on the same CC. In this case, the BS and the UE may assume that all other PUCCH schedules overlapped with PUCCH scheduled by the DCI format without carrier indication indicate the primary cell as a PUCCH cell.
When one or more PUCCHs (e.g., multiple) are scheduled for a UE configured to perform carrier switching by one or more DCI formats without carrier indication and/or one or more DCI formats with carrier indication, and when these PUCCHs are scheduled in one slot, the following cases and BS operations may be considered as specific examples of implementation B6 and implementation B6-1. In some implementations, the following operations may be applied to the case of linking with PUCCH cell patterns configured semi-statically according to time through a dynamic PUCCH carrier switching/indicating operation of DCI.
* Option 1: when one of a plurality of (e.g., two, three, or four) candidate cells can be indicated by the PUCCH carrier indicator of the DCI, if at least one or more DCIs including the PUCCH carrier indicator are transmitted to the UE among DCIs scheduling one or more (e.g., a plurality of) PUCCHs, the BS performs PUCCH reception from the UE on the indicated cell. On the other hand, if no DCI including a PUCCH carrier indicator is transmitted to the UE among DCIs scheduling one or more (e.g., a plurality of) PUCCHs (e.g., if PUCCH transmission is scheduled using only a DCI format (e.g., DCI format 1_0) without a carrier indication), the BS performs PUCCH reception on a cell determined according to a PUCCH cell pattern semi-statically configured over time. One of the candidate cells may be configured as a Pcell or PUCCH Scell.
* Option 2: in case one of one or more (e.g., one, two, or three) candidate cells is indicated by DCI or a specific state (e.g., "no handover state" in implementation B6) corresponding to "no cell indication" or "following a semi-static pattern" can be indicated, if at least one or more DCIs indicating a specific cell (including a PUCCH cell indicator) is transmitted to the UE among DCIs scheduling one or more (e.g., multiple) PUCCHs, the BS performs PUCCH reception from the UE on the indicated cell. On the other hand, if no DCI indicating a specific cell (including a PUCCH cell indicator) is transmitted to the UE among DCIs scheduling one or more (e.g., a plurality of) PUCCHs (e.g., if PUCCH transmission is scheduled only with a DCI format (e.g., DCI format 1_0) without carrier indication or only with a DCI format indicating "no cell indication" or "following a semi-static pattern"), the BS performs PUCCH reception from the UE on a cell determined according to a PUCCH cell pattern semi-statically configured according to time. One of the candidate cells may be configured as a Pcell or PUCCH Scell.
< implementation B7> different SCS between source carrier and target carrier
When the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to the PDSCH transmission for a UE configured with a plurality of CCs, and when the CC for which PUCCH resources are to be transmitted may be dynamically switched (e.g., the CC to be used is indicated by L1 signaling (e.g., DCI), or may be different for each PUCCH transmission according to a predefined rule), the BS needs to determine a location of an UL slot in which PUCCH is to be received in order to receive PUCCH from the UE on the determined CC. When a plurality of CCs configured by the UE have different SCSs, in particular, when a source carrier to which PUCCH transmission is initially indicated/configured and a target carrier to which PUCCH transmission is dynamically switched have different SCSs, the following various problems may occur.
Problem 1: when the SCS of the source carrier is greater than that of the target carrier (i.e., the SCS of the target carrier is smaller than that of the source carrier), a plurality of source carrier slots may be associated with one target carrier slot, and PUCCH transmissions located in different slots of the source carrier need to be multiplexed to one target carrier.
Problem 2: when the SCS of the source carrier is smaller than that of the target carrier (i.e., the SCS of the target carrier is greater than that of the source carrier), one source carrier slot may be associated with a plurality of target carrier slots. In other words, this may require switching to the target carrier during the source carrier time slot.
As described above, in order to prevent these problems, first, PUCCH carrier switching may be limited to switching to carriers having the same SCS. However, since this makes switching performed between limited CCs, the influence of carrier switching may be small. Thus, in some implementations of the present disclosure, PUCCH carrier switching may be performed between CCs having different SCS using at least one of the following methods.
* To solve the problem 1, when the SCS of the source carrier is greater than that of the target carrier, the BS may not switch two or more PUCCHs (particularly, when PUCCHs are located in different slots of the source carrier and each switched PUCCH is located in one slot of the target carrier) to the target carrier. Thus, when the SCS of the source carrier is greater than that of the target carrier, the UE may not expect two or more PUCCHs to be switched (and multiplexed) to the target carrier.
* To solve the problem 2, the BS may prevent CC switching from occurring during a slot of the source carrier when the SCS of the source carrier is smaller than that of the target carrier. That is, the BS may always cause CC switching to occur only at the slot boundary of the source carrier. Thus, the UE may expect that no CC switching will occur during (e.g., in the middle of) a particular time slot. If the DCI is scheduled by the PDSCH instructing the UE to perform CC switching in the middle of any slot X of the source carrier, for example, if the UE is instructed/configured to perform any PUCCH or PUSCH transmission from the first symbol to the sixth symbol of slot X, after which PUCCH transmission is performed on another CC, the UE may not perform UL transmission in slot X. This operation may be limited to the case where DCI indicating a PUCCH transmission on another CC is received later than DCI indicating a UL transmission in slot X.
* To solve problem 2, cc switching may be limited to be performed only in a specific time unit. In other words, CCs that have been switched once may be maintained for a predetermined time unit, and switching to another CC may be performed at a boundary of each time unit. In this case, the predetermined time unit may be one slot length of the following reference SCS configuration or a slot length of the minimum SCS configuration among the following standards. For this operation, different standards may be used for each CC handover. For example, when the source carrier and the target carrier have the same SCS configuration, a specific standard may not be used, and when the source carrier and the target carrier have different SCS configurations, a standard such as standard 2 or standard 4 may be applied. As another example, when CC switching is indicated through DCI, standard 1 or standards 1 and 2 may be applied, and when CC switching is performed according to rules between CCs satisfying predetermined conditions (e.g., method a1_2/b1_2 of implementation A1/B1), CC switching may be performed using standard 2.
Standard 1: SCS configuration of PDCCH
Standard 2: minimum SCS configuration provided by sc-SpecificCarrierList of FrequencyinfoUL or FrequencyinfoUL-SIB as RRC configuration
Standard 3: SCS configuration of source carrier
Standard 4: minimum SCS configuration among enabled CCs
Standard 5: minimum SCS among configured CCs
Standard 5: minimum SCS between source carrier and target carrier
Standard 6: the minimum SCS configuration among candidate CCs for PUCCH carrier switching. The "candidate CC for PUCCH carrier switching" may be a candidate CC configured for PUCCH carrier switching or a candidate CC configured for PUCCH transmission. To use standard 6, the bs may configure RRC parameters indicating the CC set for the UE individually. The CC set may be CCs that may undergo PUCCH carrier switching, and the UE and the BS may perform PUCCH carrier switching only on the configured CC set.
Standard 7: SCS configuration of primary cell
As another example, to minimize the above-described problem, it is also considered to select a source slot or a target slot based on a source PUCCH resource. More specifically, when the BS schedules PDSCH transmission and PUCCH transmission for HARQ-ACK response to the PDSCH transmission for a UE configured with a plurality of CCs, and when CCs transmitting PUCCH resources are dynamically switchable, the BS may determine a location of UL slots to receive PUCCH on CCs determined by considering the following.
* The BS may assume that the UE will perform PUCCH transmission in UL slots of a target carrier overlapping with source PUCCH resources (PUCCH resources initially used in the source carrier). When there are multiple UL slots of the target carrier overlapping the source PUCCH resource, one of the following may be considered.
UL slot/sub-slot of target carrier immediately after start of source PUCCH resource
UL slot/sub-slot of target carrier immediately before end of source PUCCH resource
UL slot/sub-slot of target carrier overlapping with first slot of source PUCCH resource
UL slot/sub-slot of target carrier overlapping with last symbol of source PUCCH resource
* The BS may assume that the UE will perform PUCCH transmission in UL slots of a target carrier overlapping with a source UL slot (a slot to which a source PUCCH resource corresponding to a PUCCH resource initially used in the source carrier is allocated). When there are multiple UL slots of the target carrier overlapping the source UL slot, one of the following may be considered.
UL slot/sub-slot of target carrier immediately after start of source UL slot
UL slot/sub-slot of target carrier immediately before end of source UL slot
UL slot/sub-slot of target carrier overlapping with first symbol of source UL slot
UL slot/sub-slot of target carrier overlapping with last symbol of source UL slot
< implementation B8> codebook construction for switching UL carriers
When the BS instructs or configures a UE configured with a plurality of CCs to transmit UCI on a PUCCH through L1 signaling (e.g., DCI) or higher layer signaling, and when the CC to transmit PUCCH resources can be instructed by the L1 signaling (e.g., DCI) of the BS or the CC to transmit PUCCH resources is determined through different methods according to respective PUCCHs, respective UCI types, and/or scheduling methods (semi-statically configured or dynamically scheduled), the BS needs to make an assumption as to how the HARQ-ACK codebook is constructed for the HARQ-ACK PUCCH to be transmitted by the UE on the determined CC.
In some scenarios (e.g., NR Rel-16), in a type 1 codebook, a UE generates a HARA-ACK codebook by collecting associated HARQ-ACK information for each cell using a set of determined HARQ-ACK feedback timing values, for each HARQ-ACK feedback timing in each cell, for each DL slot in which PDSCH can be received at each HARQ-ACK feedback timing, and for each PDSCH occasion receivable in each DL slot. However, if CCs that will transmit PUCCH resources may become different each time, the following problem may occur when resources to be transmitted according to such an operation use a different set of HARQ-ACK feedback timing values or use a set of HARQ-ACK feedback timing values that is always determined regardless of the CC to be transmitted.
Problem 1: the PDSCH scheduled in one HARQ-ACK codebook may be scheduled by a set of different HARQ-ACK feedback timings.
Problem 2: the PUCCH may be scheduled by a different set of HARQ-ACK timing values than the set of HARQ-ACK feedback timing values configured in the CC to which HARQ-ACK information is to be transmitted.
In particular, these problems may increase when, for some PDSCH, PUCCH is scheduled by a set of HARQ-ACK feedback timing values configured for a dynamically indicated CC (i.e., target carrier) to transmit PUCCH, and when, for other PDSCH, the CC to transmit PUCCH is semi-statically determined by the configured pattern and PUCCH is scheduled by a set of HARQ-ACK feedback timing values that are always determined independent of the CC to transmit HARQ-ACK information. To solve this problem, the BS may assume that a UE configured to use PUCCH carrier switching configures a type 1HARQ-ACK codebook for a HARQ-ACK PUCCH on a CC to which the PUCCH is to be transmitted, considering the following method.
* Method b8_1: to construct a type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values and SCS (or slot length based thereon) configured for CCs that will transmit a PUCCH including the corresponding codebook. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. When a PUCCH carrier of at least one PDSCH is dynamically indicated (e.g., as another carrier) (or when a dynamic PUCCH carrier switching/indication operation is semi-statically configured only by DCI without a PUCCH carrier pattern configured according to time), in other words, when a CC for which a PUCCH corresponding to at least one PDSCH is to be transmitted is indicated by L1 signaling, the method b8_1 may be used restrictively.
* Method B8_1-1: to construct the type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values configured for CCs that will transmit a PUCCH including a corresponding codebook and use SCS (or slot length based thereon) of a specific CC configuration determined for a predefined or higher layer signaling by the BS. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. In some implementations, the particular CC may be the primary cell. Alternatively, in some implementations, the particular CC may be a reference cell configured for carrier switching operations. As an example, in carrier switching operation, a reference cell configured to determine a set of HARQ-ACK feedback timing values, a slot length, and SCS for determining PDSCH to HARQ-ACK timing may be a specific CC. In some implementations, when the PUCCH carrier of the PDSCH is not dynamically indicated (e.g., as another carrier) (by DCI) (or when only the PUCCH carrier pattern semi-statically configured according to time without separate configuration for dynamic PUCCH carrier switching/indication operation by DCI is configured), in other words, when L1 signaling does not indicate CCs for transmitting the PUCCH corresponding to the PDSCH, the method b8_1-1 may be used restrictively.
* Method b8_2: to construct a type 1HARQ-ACK codebook, the UE may use a set of HARQ-ACK feedback timing values and SCS (or slot length based thereon) configured for a specific CC that is predefined or determined through higher layer signaling of the BS. Thus, a set of PDCCH occasions corresponding to HARQ-ACK information included in the type 1HARQ-ACK codebook may be determined. In some implementations, the particular CC may be the primary cell. Alternatively, in some implementations, the particular CC may be a reference cell configuration for carrier switching operations. As an example, in carrier switching operation, a reference cell configured to determine a set of HARQ-ACK feedback timing values, a slot length, and SCS for determining PDSCH to HARQ-ACK timing may be a specific CC. In some implementations, SCS of a particular CC may be used to apply HARQ-ACK feedback timing. In some implementations, when a PUCCH carrier of a PDSCH is not dynamically indicated (e.g., as another carrier) (through DCI) (or when only a PUCCH carrier pattern semi-statically configured according to time without separate configuration for dynamic PUCCH carrier switching/indication operation through DCI is configured), in other words, when L1 signaling does not indicate a CC for transmitting a PUCCH corresponding to a PDSCH, the method b8_2 may be used restrictively. As another example, SCS of the CC that will transmit PUCCH may be used to apply HARQ-ACK feedback timing. In this case, the set of HARQ-ACK feedback timing values of CCs to transmit the PUCCH may be limited to include HARQ-ACK feedback timing when scheduling the PUCCH using SCS of a specific CC and the set of HARQ-ACK feedback timing values. For example, when based on a specific CC When scheduling is performed from the set of SCS and HARQ-ACK feedback timing values, if available from DL time slot n D To UL slot n U +k performs scheduling (i.e., when PDSCH is received in DL slot n D End of middle UL slot n U And DL slot n D Associated and for the time slot n in DL D HARQ-ACK response for medium-end PDSCH reception may be at UL slot n with HARQ-ACK feedback timing k U +k), the HARQ-ACK feedback timing value of the CC may be configured such that even the set of HARQ-ACK timing values of the CC through which the PUCCH is to be transmitted may be based on the time slot n in DL D Scheduling UL slot n for PDSCH ending reception in U PUCCH transmission of +k.
< implementation B9> PDSCH processing margin for PUCCH carrier switching
When the UE performs transmission on a PUCCH carrier different from the PUCCH carrier used in the previous PUCCH transmission, the UE may require additional time to newly configure the operation of the radio transmitter. To guarantee the required time, the UE may report additional required time caused by the PUCCH carrier switching operation to the BS through the UE capability report signaling, and the BS may perform PDSCH scheduling in consideration of information reported by the UE. For example, the UE may report a processing margin PUCCHSwitchingMargin (us) as UE capability, and the BS may perform PDSCH scheduling in consideration of PUCCHSwitchingMargin as follows. E.g. assigned HARQ-ACK timing K 1 And the effect defined by the PUCCH resource to be used and including timing advance if the first UL symbol of PUCCH carrying HARQ-ACK information is no earlier than symbol L 1 Starting in the symbols of (1), the UE provides an active HARQ-ACK message, where L 1 Is defined as having T after the end of the last symbol of PDSCH carrying an acknowledgement transport block proc,1＝ (N 1 +d 1 +d 2 )*(2048+144)*κ*2 -u *T c +T ext+ T PUCCHswitch The next UL symbol of the CP that starts thereafter. Here, N 1 、d 1 、d 2 、κ*2 -u Tc and T ext Defined in clause 5.3 of 3gpp TS 38.213.
When configuring PUCCHSswitchingMargin for UE, T PUCCHSwithch The value of (2) is equal to the processing margin given by PUCCHSswitchingMarginAmount of the components.
In some implementations, the processing margin may be applied restrictively when a transmission is performed on a PUCCH carrier different from a PUCCH carrier used in a previous PUCCH transmission. In other words, when the same PUCCH carrier as that used in the previous PUCCH transmission is used, T PUCCHSwithch ＝0。
In some implementations, the processing margin may be applied restrictively when transmissions are performed on a PUCCH carrier that is different from the UL carrier used in the previous UL transmission. In other words, when the same PUCCH carrier as that used in the previous UL transmission is used, T PUCCHSwithch ＝0。
In some implementations, the processing margin may be limited to the case where PUCCH carrier switching is dynamically performed, for example, the case where PUCCH carriers are switched by scheduling PUCCH carrier indications included in DCI. This is because, when the PUCCH carrier is semi-statically switched, the UE may pre-switch the UL carrier before scheduling the PUCCH. In other words, when configuring PUCCH carrier switching for UE to be performed in a semi-statically given UL CC pattern, T PUCCHSwithch ＝0。
In some implementations, each pair of CCs available to the UE reports PUCCHSwitchingMargin separately. When a UE is handed over from CC A to CC B, or when it is handed over from CC B to CC A, the value of PUCCHSswitchingMargin associated with a pair of CC A and B may be used as T PUCCHSwithch 。
In some implementations, the PUCCHSwitchingMargin may be reported for each UL CC available to the UE. This is to assume that PUCCH carrier switching is always on the primary cell. That is, if there is no separate indication of the PUCCH carrier, the UE may transmit PUCCH on the primary cell and assume T PUCCHSwithch =0. If a PUCCH carrier to be used is indicated, the UE may use the value of PUCCHSswitchingMargin associated with that carrier as T PUCCHSwithch 。
Alternatively, as another example, the UE may report the processing margin PUCCHSwitchingSymbolMargin as UE capability in symbol units, and the BS may perform PDSCH scheduling in consideration of pucchchswitchingsymbolmargin as follows. E.g. assigned HARQ-ACK timing K 1 And PUCCH resources to be usedThe effect defined by the source and including timing advance if the first UL symbol of PUCCH carrying HARQ-ACK information is no earlier than symbol L 1 Starting in the symbols of (1), the UE provides an active HARQ-ACK message, where L 1 Is defined as having T after the end of the last symbol of PDSCH carrying an acknowledgement transport block proc,1＝ (N 1 +d 1 +d 2 )*(2048+144)*κ*2 -u *T c +T ext The next UL symbol of the CP that starts thereafter. Here, N 1 、d 1 、d 2 、κ*2 -u Tc and T ext Defined in clause 5.3 of 3gpp TS 38.213.
D when configuring PUCCHSswitchingSymbolMargin for UE 3 The value of (2) is equal to the processing margin given by PUCCHSswitchingSymbolMargin.
In some implementations, the processing margin may be applied restrictively when a transmission is performed on a PUCCH carrier different from a PUCCH carrier used in a previous PUCCH transmission. In other words, when the same PUCCH carrier as the PUCCH carrier of the previous PUCCH transmission is used, d 3 =0, otherwise d 3 >0。
In some implementations, the processing margin may be applied restrictively when transmissions are performed on a PUCCH carrier that is different from the UL carrier used in the previous UL transmission. In other words, when the same PUCCH carrier as the PUCCH carrier of the previous UL transmission is used, d 3 =0, otherwise d 3 >0。
In some implementations, the processing margin may be limited to a case where PUCCH carrier switching is performed dynamically, e.g., a case where PUCCH carrier switching is performed by scheduling PUCCH carrier indications included in DCI. This is because, when the PUCCH carrier is semi-statically switched, the UE may pre-switch the UL carrier before scheduling the PUCCH. In other words, d when configuring PUCCH carrier switching for UE to be performed in semi-statically given UL CC pattern 3 ＝0。
In some implementations, each pair of CCs available to the UE reports PUCCHSwitchingSymbolMargin. When a UE switches from CC A to CC B or from CC B to CC A, the value of PUCCHSswitching SymbolMargin associated with a pair of CC A and B may be used as d 3 。
In some implementations, PUCCHSwitchingSymbolMargin may be reported for each UL CC available to the UE. This is to assume that PUCCH carrier switching is always on the primary cell. That is, if there is no separate indication of the PUCCH carrier, the UE may transmit PUCCH on the primary cell and assume d 3 =0. When a PUCCH carrier to be used is indicated, the value of pucchhswitchingmargin associated with that carrier may be used as d 3 。
The UE and the BS may perform RRC configuration for configuring available CCs in a cell configuration process. When the BS schedules PDSCH transmissions and PUCCH transmissions for HARQ-ACK responses to PDSCH transmissions for the UE, the UE may dynamically select a carrier on which PUCCH for HARQ-ACK responses will be transmitted according to some implementations of the present disclosure, and the BS may receive UCI on PUCCH resources to be transmitted on the corresponding carrier according to some implementations of the present disclosure.
According to some implementations of the present disclosure, when a UE may use multiple CCs, the BS may instruct or configure the UE to dynamically switch PUCCH transmission carriers so that the UE may perform continuous UL transmission. According to some implementations of the present disclosure, when a UE may use multiple CCs, the UE may switch PUCCH transmission carriers according to a predefined rule, and the BS may predict this unambiguously. With some implementations of the present disclosure, the UE may minimize abandoned UL transmissions caused by TDD patterns and use UL resources without waste.
The UE may perform operations in association 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 means for the UE may comprise: 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 (non-volatile) 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 recorded on at least one computer-readable (non-volatile) storage medium and that, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure. In a UE, a processing device, a computer-readable (non-volatile) storage medium, and/or a computer program product, operations may include: performing PDSCH reception in a plurality of cells including a primary cell and including a secondary cell configured for PUCCH cell switching; determining a HARQ-ACK feedback timing value K for PDSCH reception among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell; determining a time slot n+K on the primary cell based on a last time slot n overlapped with PDSCH reception and a HARQ-ACK feedback timing value K among time slots of the primary cell; and transmitting the HARQ-ACK information for PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for PDSCH reception using the secondary cell between the primary cell and the secondary cell according to PUCCH cell switching. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In some implementations, the HARQ-ACK feedback timing value K may be determined from among a set of HARQ-ACK feedback timing values based on a field in a message received by the scheduled PDSCH.
In some implementations, PUCCH cell switching may include switching cells between a primary cell and a secondary cell for PUCCH transmission related to multiple cells according to a predetermined rule.
In some implementations, the operations may further include transmitting a higher layer signal including the PUCCH cell switching pattern to the UE. PUCCH cell switching may be performed according to a PUCCH cell switching pattern.
The BS may perform operations in association with the reception of HARQ-ACK information 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 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 means for the BS 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 (non-volatile) 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 recorded on at least one computer-readable (non-volatile) storage medium and that, when executed, cause (at least one processor) to perform operations according to some implementations of the present disclosure. In a BS, a processing device, a computer readable (non-volatile) storage medium, and/or a computer program product, operations may include: performing PDSCH transmission in a plurality of cells including a primary cell for a UE and including a secondary cell for PUCCH cell handover configured for the UE; determining a HARQ-ACK feedback timing value K for PDSCH transmission among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell; determining a time slot n+k on the primary cell based on a last time slot n overlapping PDSCH transmission and a HARQ-ACK feedback timing value K among time slots of the primary cell; and receiving HARQ-ACK information for PDSCH transmission in time slot m on the secondary cell based on receiving HARQ-ACK information for PDSCH transmission using the secondary cell between the primary cell and the secondary cell according to PUCCH cell handover. The slot m may be a slot including the beginning of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
In some implementations, the HARQ-ACK feedback timing value K may be determined from among a set of HARQ-ACK feedback timing values based on a field in a message received by the scheduled PDSCH.
In some implementations, PUCCH cell switching may include switching cells between a primary cell and a secondary cell for PUCCH transmission related to multiple cells according to a predetermined rule.
In some implementations, the operations may further include receiving a higher layer signal including a PUCCH cell switching pattern. PUCCH cell switching may be performed according to a PUCCH cell switching pattern.
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 (13)
1. A method of transmitting hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, information by a user equipment in a wireless communication system, the method comprising the steps of:
Performing physical downlink shared channel, PDSCH, reception in a plurality of cells including a primary cell and including a secondary cell configured for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH reception among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell;
determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping with the PDSCH reception among slots of the primary cell; and
transmitting the HARQ-ACK information for the PDSCH reception in a slot m on the secondary cell based on transmitting the HARQ-ACK information for the PDSCH reception between the primary cell and the secondary cell using the secondary cell according to the PUCCH cell handover,
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
2. The method of claim 1, wherein the HARQ-ACK feedback timing value K is determined from among the set of HARQ-ACK feedback timing values based on a field in a message that schedules the PDSCH reception.
3. The method of claim 1, wherein the PUCCH cell switching comprises switching a cell for PUCCH transmission related to the plurality of cells between the primary cell and the secondary cell according to a predetermined rule.
4. The method of claim 1, further comprising the step of:
a higher layer signal including a PUCCH cell switching pattern is received,
wherein the PUCCH cell switching is performed according to the PUCCH cell switching pattern.
5. A user equipment for transmitting hybrid automatic repeat request, HARQ, acknowledgement, ACK, HARQ-ACK, information in a wireless communication system, the user equipment comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
performing physical downlink shared channel, PDSCH, reception in a plurality of cells including a primary cell and including a secondary cell configured for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH reception among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell;
Determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping with the PDSCH reception among slots of the primary cell; and
transmitting the HARQ-ACK information for the PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for the PDSCH reception between the primary cell and the secondary cell using the secondary cell according to the PUCCH cell handover, and
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
6. A processing apparatus in a wireless communication system, the processing apparatus comprising:
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
performing physical downlink shared channel, PDSCH, reception in a plurality of cells including a primary cell and including a secondary cell configured for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH reception among a set of hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, feedback timing values configured for the primary cell between the primary cell and the secondary cell;
Determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping with the PDSCH reception among slots of the primary cell; and
transmitting the HARQ-ACK information for the PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for the PDSCH reception between the primary cell and the secondary cell using the secondary cell according to the PUCCH cell handover, and
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
7. A computer-readable storage medium storing at least one program comprising instructions that, when executed, cause at least one processor to perform operations comprising:
performing physical downlink shared channel, PDSCH, reception in a plurality of cells including a primary cell and including a secondary cell configured for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH reception among a set of hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, feedback timing values configured for the primary cell between the primary cell and the secondary cell;
Determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping with the PDSCH reception among slots of the primary cell; and
transmitting the HARQ-ACK information for the PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for the PDSCH reception between the primary cell and the secondary cell using the secondary cell according to the PUCCH cell handover, and
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
8. A computer program stored in a computer readable storage medium, the computer program comprising:
performing physical downlink shared channel, PDSCH, reception in a plurality of cells including a primary cell and including a secondary cell configured for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH reception among a set of hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, feedback timing values configured for the primary cell between the primary cell and the secondary cell;
Determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping with the PDSCH reception among slots of the primary cell; and
transmitting the HARQ-ACK information for the PDSCH reception in time slot m on the secondary cell based on transmitting the HARQ-ACK information for the PDSCH reception between the primary cell and the secondary cell using the secondary cell according to the PUCCH cell handover, and
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
9. A method of receiving hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, information from a user equipment by a base station in a wireless communication system, the method comprising the steps of:
performing physical downlink shared channel, PDSCH, transmission in a plurality of cells including a primary cell for the user equipment and including a secondary cell configured for the user equipment for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH transmission among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell;
Determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping the PDSCH transmission among slots of the primary cell; and
based on receiving the HARQ-ACK information for the PDSCH transmission using the secondary cell between the primary cell and the secondary cell according to the PUCCH cell handover, the HARQ-ACK information for the PDSCH transmission is received in slot m on the secondary cell,
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
10. The method of claim 9, wherein the HARQ-ACK feedback timing value K is determined from among the set of HARQ-ACK feedback timing values based on a field in a message that schedules the PDSCH transmission.
11. The method of claim 9, wherein the PUCCH cell switching comprises switching a cell for PUCCH transmission related to the plurality of cells between the primary cell and the secondary cell according to a predetermined rule.
12. The method of claim 9, further comprising the step of:
a higher layer signal including a PUCCH cell switching pattern is received,
Wherein the PUCCH cell switching is performed according to the PUCCH cell switching pattern.
13. A base station for receiving hybrid automatic repeat request, HARQ, acknowledgement, HARQ-ACK, information from a user equipment by the base station in a wireless communication system, the base station comprising:
at least one transceiver;
at least one processor; and
at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:
performing physical downlink shared channel, PDSCH, transmission in a plurality of cells including a primary cell for the user equipment and including a secondary cell configured for the user equipment for physical uplink control channel, PUCCH, cell handover;
determining a HARQ-ACK feedback timing value K for the PDSCH transmission among a set of HARQ-ACK feedback timing values configured for the primary cell between the primary cell and the secondary cell;
determining a slot n+k on the primary cell based on the HARQ-ACK feedback timing value K and a last slot n overlapping the PDSCH transmission among slots of the primary cell; and
Based on receiving the HARQ-ACK information for the PDSCH transmission using the secondary cell between the primary cell and the secondary cell according to the PUCCH cell handover, the HARQ-ACK information for the PDSCH transmission is received in slot m on the secondary cell,
wherein the slot m is a slot including the start of the slot n+k among slots of the secondary cell overlapping with the slot n+k.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2021-0044318 | 2021-04-05 | ||
| KR10-2021-0060319 | 2021-05-10 | ||
| KR10-2021-0103977 | 2021-08-06 | ||
| KR10-2021-0131146 | 2021-10-01 | ||
| KR20210131146 | 2021-10-01 | ||
| PCT/KR2022/004878 WO2022216009A1 (en) | 2021-04-05 | 2022-04-05 | Method, user equipment, processing device, storage medium, and computer program for transmitting harq-ack information, and method and base station for receiving harq-ack information |
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| Publication Number | Publication Date |
|---|---|
| CN117121594A true CN117121594A (en) | 2023-11-24 |
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| CN202280024875.8A Pending CN117121594A (en) | 2021-04-05 | 2022-04-05 | Method for transmitting HARQ-ACK information, user equipment, processing device, storage medium, computer program, and method and base station for receiving HARQ-ACK information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117121594A (en) |
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