WO2020204508A1 - Method, user equipment, device and storage medium for performing uplink transmission, and method and base station for performing uplink reception - Google Patents

Abstract

According to one aspect of the present disclosure, a method by which user equipment transmits an uplink signal in a wireless communication system comprises: receiving information about a first start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is related to start symbol S of an uplink time resource and number L of symbols counted from start symbol S, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; receiving SLIV information related to a specific SLIV from among a plurality of SLIVs included in the first SLIV set; and transmitting the uplink signal on the uplink time resource related to with the specific SLIV on the basis of the SLIV information, wherein the first SLIV set includes at least one SLIV related to the uplink time resource including a slot boundary.

Description

Method for performing uplink transmission, user equipment, device, storage medium, method for performing uplink reception, and base station

The present disclosure relates to a wireless communication system.

Various devices and technologies such as smart phones and tablet PCs (Personal Computers) that require high data transmission, such as machine-to-machine (M2M) communication, machine type communication (MTC), etc. have appeared and spread. have. Accordingly, the amount of data required to be processed in a cellular network is increasing very rapidly. In order to satisfy such rapidly increasing data processing requirements, carrier aggregation technology, cognitive radio technology, etc. to efficiently use more frequency bands, etc., increase the data capacity transmitted within a limited frequency. Multi-antenna technology, multi-base station cooperation technology, etc. are developing.

As more communication devices require larger communication capacity, there is a need for enhanced mobile broadband (eMBB) communication compared to legacy radio access technology (RAT). In addition, massive machine type communication (mMTC) for providing various services anytime, anywhere by connecting a plurality of devices and objects to each other is one of the major issues to be considered in next-generation communication.

In addition, a discussion on a communication system to be designed in consideration of a service/user equipment (UE) sensitive to reliability and latency is ongoing. The introduction of next generation wireless access technology is being discussed in consideration of eMBB communication, mMTC, ultra-reliable and low latency communication (URLLC), and the like.

With the introduction of new wireless communication technology, not only the number of UEs to which the base station has to provide services in a predetermined resource area increases, but also the amount of data and control information transmitted/received with the UEs that the base station provides service Is increasing. Since the amount of radio resources available for the base station to communicate with the UE(s) is finite, the base station transmits up/downlink data and/or up/downlink control information to/from the UE(s) using finite radio resources. A new scheme for efficient reception/transmission is required. In other words, as the density of the node increases and/or the density of the UE increases, there is a need for a method for efficiently using high density nodes or high density user devices for communication.

In addition, there is a need for a method to efficiently support various services having different requirements in a wireless communication system.

In addition, overcoming delay or latency is an important challenge for applications where performance is sensitive to delay/latency.

The technical problems to be achieved in the various examples of the present disclosure are not limited to the matters mentioned above, and other technical problems that are not mentioned are to those of ordinary skill in the art from various examples of the present disclosure to be described below. Can be considered by

Various examples of the present disclosure may provide a method of transmitting and receiving a signal in a wireless communication system and an apparatus supporting the same.

As an aspect of the present disclosure, in a method for a user equipment to transmit an uplink signal in a wireless communication system, information on a first start and length indicator value (SLIV) set is received, and included in the first SLIV set Each of the plurality of SLIVs is associated with a start symbol S of an uplink time resource and a symbol number L counted from the start symbol S, where S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV related to an uplink time resource including a slot boundary. This is an uplink signal transmission method.

In another aspect of the present disclosure, an apparatus for a user equipment in a wireless communication system, comprising: at least one processor; And at least one memory (memory) operably connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, wherein the operations are: 1 Receives information on a start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and the number of symbols counted from the start symbol S Associated with L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV related to an uplink time resource including a slot boundary. Device.

In yet another aspect of the present disclosure, a user equipment for transmitting an uplink signal in a wireless communication system, comprising: at least one transceiver; At least one processor; And at least one memory (memory) operably connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, wherein the operations are: 1 Receives information on a start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and the number of symbols counted from the start symbol S Associated with L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV related to an uplink time resource including a slot boundary. It is a user device.

In yet another aspect of the disclosure, a computer-readable storage medium, wherein the computer-readable storage medium, when executed by at least one or more processors, causes the at least one or more processors to perform operations for a user equipment. Stores at least one computer program comprising instructions, the operations comprising: receiving information about a first set of start and length indicator values (SLIV), wherein a plurality of pieces of information included in the first SLIV set are stored. Each of the SLIVs is associated with a start symbol S of an uplink time resource and a symbol number L counted from the start symbol S, where S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV related to an uplink time resource including a slot boundary. It is a computer-readable storage medium.

In another aspect of the present disclosure, in a method for a base station to receive an uplink signal in a wireless communication system, information on a first SLIV set is transmitted, wherein each of a plurality of SLIVs included in the first SLIV set is A start symbol S of an uplink time resource and the number of symbols counted from the start symbol S are associated with L, where S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1; Transmitting SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And receiving the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary. This is an uplink signal reception method.

In another aspect of the present disclosure, a base station for receiving an uplink signal in a wireless communication system, comprising: at least one processor; And at least one memory (memory) operably connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, wherein the operations are: Transmitting information on 1 SLIV set, wherein each of the plurality of SLIVs included in the first SLIV set is associated with a start symbol S of an uplink time resource and the number of symbols L counted from the start symbol S, and S is An integer greater than or equal to 0 and L is an integer greater than or equal to 1; Transmitting SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And receiving the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information, and the first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary. It is a base station.

Here, information on the second SLIV set is received, and the SLIV information is one of a plurality of SLIVs included in the first SLIV set other than the second SLIV set based on the setting of the first SLIV set. I can instruct.

Here, information on the second SLIV set may be received, and the SLIV information may indicate one of all SLIVs included in the first SLIV set and the second SLIV set.

Here, the information on the first SLIV set may further include information on S and L associated with each of a plurality of SLIVs included in the first SLIV set.

Here, S and L associated with each of the plurality of SLIVs included in the second SLIV set are defined based on SLIV = 14 * (L-1) + S if (L-1) <= 7, and 7 < If (L-1) <= 13, it is defined based on SLIV = 14 * (14-L + 1) + (14-1-S), and SLIV is any of a plurality of SLIVs included in the second SLIV set. One, and the slot may include 14 symbols.

Here, at least one of the plurality of SLIVs included in the first SLIV set is associated with an uplink time resource having a length of more than 14 symbols in the time domain, wherein the slot includes 14 symbols, and the second SLIV At least one of the plurality of SLIVs included in the set may be associated with an uplink time resource having a length of 14 symbols or less in the time domain.

Here, information on the first SLIV set and information on the second SLIV set may be received through radio resource control (RRC) signaling.

The above problem solving methods are only some of the various examples of the present disclosure, and various examples reflecting the technical features of the present disclosure may be derived and understood based on the following detailed description by a person having ordinary knowledge in the art. have.

According to various examples of the present disclosure, a wireless communication signal may be efficiently transmitted/received. Accordingly, the overall throughput of the wireless communication system can be increased.

In addition, various services having different requirements can be efficiently supported in a wireless communication system.

Further, a delay/latency occurring during wireless communication between communication devices may be reduced.

The effects according to the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art related to the present disclosure from the following detailed description. .

The accompanying drawings are provided to aid understanding of various examples of the present disclosure, and provide various examples of the present disclosure together with a detailed description. However, the technical features of various examples of the present disclosure are not limited to a specific drawing, and features disclosed in each drawing may be combined with each other to constitute a new example. Reference numerals in each drawing refer to structural elements.

1 shows an example of communication system 1 to which implementations of the present disclosure are applied.

2 is a block diagram illustrating examples of communication devices capable of performing a method according to the present disclosure.

3 illustrates another example of a wireless device capable of performing implementation(s) of the present disclosure.

4 is a diagram illustrating physical channels used in a communication system based on a 3rd generation partnership project (3GPP), which is an example of a wireless communication system, and a signal transmission/reception process using them.

5 illustrates a random access process that can be applied to the implementation(s) of the present disclosure.

6 illustrates a discontinuous reception (DRX) operation that may be applied to the implementation(s) of the present disclosure.

7 shows an example of a frame structure usable in a 3GPP-based wireless communication system.

8 illustrates a resource grid of a slot.

9 illustrates a slot structure that can be used in a 3GPP-based system.

10 illustrates an example of PDSCH time domain resource allocation by PDCCH and an example of PUSCH time domain resource allocation by PDCCH.

11 illustrates a hybrid automatic repeat request-acknowledgement (HARQ-ACK) transmission/reception process.

12 illustrates an uplink/downlink transmission process for various examples of the present disclosure.

13 is a flowchart of a table-based TDRA method according to an example of the present disclosure.

14 is a flowchart of a method for transmitting an uplink signal by a user equipment according to an example of the present disclosure.

15 is a flowchart of a method for receiving an uplink by a base station according to an example of the present disclosure.

Hereinafter, implementations according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description to be disclosed below together with the accompanying drawings is intended to describe an exemplary implementation of the present disclosure, and is not intended to represent the only implementation form in which the present disclosure may be practiced. The detailed description below includes specific details to provide a thorough understanding of the present disclosure. However, one of ordinary skill in the art appreciates that the present disclosure may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present disclosure, well-known structures and devices may be omitted, or may be illustrated in a block diagram form centering on core functions of each structure and device. In addition, the same components will be described with the same reference numerals throughout the present disclosure.

The techniques, devices, and systems described below can be applied to various wireless multiple access systems. Examples of multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA) system. division multiple access) system, MC-FDMA (multi carrier frequency division multiple access) system, and the like. CDMA may be implemented in a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented in a radio technology such as Global System for Mobile communication (GSM), General Packet Radio Service (GPRS), Enhanced Data Rates for GSM Evolution (EDGE) (ie, GERAN). OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE802-20, and evolved-UTRA (E-UTRA). UTRA is a part of Universal Mobile Telecommunication System (UMTS), and 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of E-UMTS using E-UTRA. 3GPP LTE adopts OFDMA in downlink (DL) and SC-FDMA in uplink (UL). LTE-advanced (LTE-A) is an evolved form of 3GPP LTE.

For convenience of description, the following description will be made on the assumption that the present disclosure is applied to a 3GPP-based communication system, for example, LTE and NR. However, the technical features of the present disclosure are not limited thereto. For example, although the following detailed description is described based on a mobile communication system corresponding to a 3GPP LTE/NR system, it can also be applied to any other mobile communication system, except for items specific to 3GPP LTE/NR. Do.

For terms and technologies that are not specifically described among terms and technologies used in the present disclosure, 3GPP LTE standard documents, for example, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.300 and 3GPP TS 36.331 and the like, 3GPP NR standard documents, for example, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.214, 3GPP TS 38.300, 3GPP TS 38.321, 3GPP TS 38.331, and the like.

In the examples of the present disclosure to be described later, the expression "assumes" by the device may mean that the subject transmitting the channel transmits the channel so as to conform to the "assumption". The subject receiving the channel may mean that the channel is received or decoded in a form conforming to the “assuming” under the premise that the channel is transmitted to conform to the “assuming”.

In the present disclosure, that a channel is punctured in a specific resource means that the signal of the channel is mapped to the specific resource in the resource mapping process of the channel, but the signal portion mapped to the punctured resource is excluded when the channel is transmitted. It means that it is transmitted as it is. In other words, although the specific resource to be punctured is counted as the resource of the corresponding channel during the resource mapping process of the corresponding channel, the signal mapped to the specific resource among the signals of the corresponding channel is not actually transmitted. The receiving device of the corresponding channel receives, demodulates or decodes the corresponding channel assuming that the signal portion mapped to the punctured specific resource is not transmitted. On the other hand, when a channel is rate-matched in a specific resource, it means that the channel is not mapped to the specific resource at all in the resource mapping process of the channel, and thus is not used for transmission of the channel. In other words, the rate-matched specific resource is not counted as a resource of the corresponding channel at all during the resource mapping process of the corresponding channel. The receiving device of the corresponding channel receives, demodulates or decodes the corresponding channel, assuming that the rate-matched specific resource is not used for mapping and transmission of the corresponding channel at all.

In the present disclosure, the UE may be fixed or mobile, and various devices that transmit and/or receive user data and/or various control information by communicating with a base station (BS) belong to this. The UE includes (Terminal Equipment), MS (Mobile Station), MT (Mobile Terminal), UT (User Terminal), SS (Subscribe Station), wireless device, PDA (Personal Digital Assistant), and wireless modem. ), handheld device, etc. In addition, in the present disclosure, a BS generally refers to a fixed station that communicates with a UE and/or another BS, and exchanges various data and control information by communicating with the UE and other BSs. BS may be referred to as other terms such as ABS (Advanced Base Station), NB (Node-B), eNB (evolved-NodeB), BTS (Base Transceiver System), Access Point (Access Point), PS (Processing Server). In particular, the base station of UTRAN is called Node-B, the base station of E-UTRAN is called eNB, and the base station of new radio access technology network is called gNB. Hereinafter, for convenience of description, the base station is collectively referred to as a BS regardless of the type or version of the communication technology.

In the present disclosure, a node refers to a fixed point at which a radio signal can be transmitted/received by communicating with a UE. Various types of BSs can be used as nodes regardless of their name. For example, BS, NB, eNB, pico-cell eNB (PeNB), home eNB (HeNB), relay, repeater, and the like may be nodes. Also, the node may not have to be a BS. For example, it may be a radio remote head (RRH) or a radio remote unit (RRU). RRH, RRU, etc. generally have a power level lower than the power level of the BS. RRH or RRU or less, RRH/RRU) is generally connected to the BS by a dedicated line such as an optical cable, so RRH/RRU and BS are generally compared to cooperative communication by BSs connected by wireless lines. By cooperative communication can be performed smoothly. At least one antenna is installed in one node. The antenna may mean a physical antenna, or an antenna port, a virtual antenna, or an antenna group. Nodes are also called points.

In the present disclosure, a cell refers to a certain geographic area in which one or more nodes provide communication services. Accordingly, in the present disclosure, communication with a specific cell may mean communication with a BS or a node that provides a communication service to the specific cell. In addition, the downlink/uplink signal of a specific cell means a downlink/uplink signal from/to a BS or a node that provides a communication service to the specific cell. A cell that provides uplink/downlink communication services to a UE is specifically referred to as a serving cell. In addition, the channel state/quality of a specific cell refers to a channel state/quality of a channel or communication link formed between a BS or a node and a UE providing a communication service to the specific cell. In the 3GPP-based communication system, the UE determines the downlink channel state from a specific node, CRS(s) transmitted on a CRS (Cell-specific Reference Signal) resource allocated to the specific node by the antenna port(s) of the specific node, and / Or it can be measured using CSI-RS(s) transmitted on a Channel State Information Reference Signal (CSI-RS) resource.

Meanwhile, the 3GPP-based communication system uses the concept of a cell to manage radio resources, and a cell associated with a radio resource is distinguished from a cell in a geographic area.

The “cell” in the geographic area may be understood as coverage in which a node can provide a service using a carrier, and the “cell” of a radio resource is a bandwidth (a frequency range configured by the carrier). bandwidth, BW). Since downlink coverage, which is a range in which a node can transmit a valid signal, and uplink coverage, which is a range in which a valid signal can be received from a UE, is dependent on the carrier that carries the signal, the node's coverage is used by the node. It is also associated with the coverage of the "cell" of the radio resource to be used. Therefore, the term "cell" can sometimes be used to mean coverage of a service by a node, sometimes a radio resource, and sometimes a range within which a signal using the radio resource can reach a valid strength.

Meanwhile, the 3GPP communication standard uses the concept of a cell to manage radio resources. The term "cell" associated with radio resources is defined as a combination of downlink resources (DL resources) and uplink resources (UL resources), that is, a combination of a DL component carrier (CC) and a UL CC. . The cell may be configured with a DL resource alone or a combination of a DL resource and a UL resource. When carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or, DL CC) and the carrier frequency of the UL resource (or UL CC) is indicated by system information Can be. For example, a combination of a DL resource and a UL resource may be indicated by a system information block type 2 (SIB2) linkage. Here, the carrier frequency may be the same as 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. One serving cell provides non-access stratum (NAS) mobility information at RRC connection establishment/re-establishment/handover, and one serving cell Provides a security input when re-establishing an RRC connection/handover. Such cells are referred to as primary cells (Pcell). The Pcell is a cell operating on a primary frequency at which the UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure. Depending on the UE capability, secondary cells (Scells) may be configured to form a set of serving cells together with the Pcell. Scell is a cell that can be set after RRC (Radio Resource Control) connection establishment is made, and provides additional radio resources in addition to the resources of a special cell (SpCell). In downlink, a carrier corresponding to a Pcell is called a downlink primary CC (DL PCC), and a carrier corresponding to a Pcell in uplink is called a UL primary CC (DL PCC). A carrier corresponding to the Scell in downlink is referred to as a DL secondary CC (DL SCC), and a carrier corresponding to the Scell in uplink is referred to as a UL secondary CC (UL SCC).

In the case of dual connectivity (DC) operation, the term SpCell refers to a Pcell of a master cell group (MCG) or a Pcell of a secondary cell group (SCG). SpCell supports PUCCH transmission and contention-based random access, and is always activated. The MCG is a group of serving cells associated with a master node (eg, BS) and consists of SpCell (Pcell) and optionally (optionally) one or more Scells. For a UE configured as DC, the SCG is a subset of serving cells associated with the secondary node, and consists of a PSCell and zero or more Scells. In the case of a UE in the RRC_CONNECTED state that is not set to CA or DC, there is only one serving cell composed of only Pcell. In the case of a UE in the RRC_CONNECTED state set to CA or DC, the term serving cells refers to a set of cells consisting of SpCell(s) and all Scell(s). In DC, two MAC entities, one medium access control (MAC) entity for MCG and one MAC entity for SCG, are configured in the UE.

In a UE in which CA is configured and DC is not configured, a Pcell PUCCH group consisting of a Pcell and zero or more Scells and an Scell PUCCH group consisting of only Scell(s) may be configured. In the case of an Scell, an Scell (hereinafter referred to as a PUCCH cell) through which a PUCCH associated with a corresponding cell is transmitted may be configured. The Scell indicated by the PUCCH Scell belongs to the Scell PUCCH group, and the PUCCH transmission of the related UCI is performed on the PUCCH Scell, and the Scell whose PUCCH Scell is not indicated or the cell indicated as a PUCCH transmission cell is a Pcell belongs to the Pcell PUCCH group, and the PUCCH transmission of related UCI is performed on the Pcell.

In a wireless communication system, a UE receives information from a BS through a downlink (DL), and the UE transmits information to the BS through an uplink (UL). The information transmitted and/or received by the BS and the UE includes data and various control information, and various physical channels exist according to the type/use of the information they transmit and/or receive.

3GPP-based communication standards include downlink physical channels corresponding to resource elements carrying information originating from higher layers, and downlink physical channels corresponding to resource elements used by the physical layer but not carrying information originating from higher layers. Link physical signals are defined. For example, a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc. are the downlink physical channels. It is defined, and a reference signal and a synchronization signal are defined as downlink physical signals. A reference signal (RS), also referred to as a pilot, refers to a signal of a predefined special waveform that the BS and the UE know each other. For example, a demodulation reference signal (DMRS), channel state information RS (channel state information RS, CSI-RS), etc. are defined as a downlink reference signal. 3GPP-based communication standards include uplink physical channels corresponding to resource elements carrying information originating from an upper layer, and uplink physical channels corresponding to resource elements used by the physical layer but not carrying information originating from an upper layer. Link physical signals are defined. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are used as uplink physical channels. It is defined, and a demodulation reference signal (DMRS) for an uplink control/data signal, a sounding reference signal (SRS) used for uplink channel measurement, and the like are defined.

In the present disclosure, PDCCH (Physical Downlink Control CHannel) refers to a set of time-frequency resources (eg, resource elements) carrying Downlink Control Information (DCI), and PDSCH (Physical Downlink Shared CHannel) refers to downlink data. It means a set of time-frequency resources to carry. In addition, PUCCH (Physical Uplink Control CHannel), PUSCH (Physical Uplink Shared CHannel), PRACH (Physical Random Access CHannel) are each (respectively) UCI (Uplink Control Information), uplink data, time-frequency carrying a random access signal It means a collection of resources. Hereinafter, the expression that the user equipment transmits/receives PUCCH/PUSCH/PRACH is used in the same sense as transmitting/receiving uplink control information/uplink data/random access signals on or through PUSCH/PUCCH/PRACH, respectively. do. In addition, the expression that the BS transmits/receives PBCH/PDCCH/PDSCH is used in the same meaning as transmitting broadcast information/downlink data/downlink control information on or through PBCH/PDCCH/PDSCH, respectively.

As more communication devices require a larger communication capacity, there is a need for enhanced mobile broadband (eMBB) communication compared to the existing radio access technology (RAT). In addition, massive MTC (mMTC), which provides various services anytime, anywhere by connecting a number of devices and objects, is also one of the major issues to be considered in next-generation communication. In addition, a communication system design considering a service/UE sensitive to reliability and latency is being discussed. In this way, the introduction of the next-generation RAT considering eMBB, mMTC, and URLLC (Ultra-Reliable and Low Latency Communication) is being discussed. Currently, 3GPP is conducting a study on the next-generation mobile communication system after EPC. In the present disclosure, for convenience, a corresponding technology is referred to as a new RAT (NR) or 5G RAT, and a system using or supporting NR is referred to as an NR system.

1 shows an example of communication system 1 to which implementations of the present disclosure are applied. Referring to FIG. 1, a communication system 1 applied to the present disclosure includes a wireless device, a BS, and a network. Here, the wireless device refers to a device that performs communication using wireless access technology (eg, 5G NR (New RAT), LTE (eg, E-UTRA)), and may be referred to as a communication/wireless/5G device. . Although not limited thereto, wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, including HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone, It can be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors, smart meters, and the like. For example, the BS and the network may be implemented as a wireless device, and a specific wireless device 200a may operate as a BS/network node to another wireless device.

The wireless devices 100a to 100f may be connected to the network 300 through the BS 200. AI (Artificial Intelligence) 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 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the BS 200/network 300, but may perform direct communication (e.g. sidelink communication) without passing through the BS/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. V2V (Vehicle to Vehicle)/V2X (Vehicle to Everything) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/ connections 150a and 150b may be achieved between the wireless devices 100a to 100f/BS 200 to the BS 200/wireless devices 100a to 100f. Here, wireless communication/connection may be performed through various wireless access technologies (eg, 5G NR) for uplink/downlink communication 150a and sidelink communication 150b (or D2D communication). Through wireless communication/ connection 150a and 150b, the wireless device and the BS/wireless device may transmit/receive wireless signals to each other. To this end, based on various proposals of the present disclosure, various configuration information setting processes for transmission/reception of radio signals, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, resources) Mapping/demapping, etc.), resource allocation process, etc. may be performed.

2 is a block diagram illustrating examples of communication devices 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 wireless signals through various wireless access technologies (eg, LTE, NR). Here, {the first wireless device 100, the second wireless device 200} is the {wireless device 100x, BS 200} and/or {wireless device 100x, wireless device 100x) of FIG. 1 } Can be matched.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108. The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the functions, procedures, and/or methods described/suggested above. For example, the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106. In addition, the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106. 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 store software code including instructions for performing some or all of the processes controlled by the processor 102, or performing the previously described/suggested procedures and/or methods. . Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 may be connected to the processor 102 and may transmit and/or receive radio signals through one or more antennas 108. The transceiver 106 may comprise a transmitter and/or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In the present disclosure, a wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 and one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208. The processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the functions, procedures, and/or methods described/suggested above. For example, the processor 202 may process information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206. In addition, the processor 202 may store information obtained from signal processing of the fourth information/signal in the memory 204 after receiving a radio signal including the fourth information/signal through the transceiver 206. 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 store software code including instructions for performing some or all of the processes controlled by the processor 202, or performing the procedures and/or methods described/suggested above. . Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 may be connected to the processor 202 and may transmit and/or receive radio signals through one or more antennas 208. The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be mixed with an RF unit. In the present disclosure, a wireless device may mean a communication modem/circuit/chip.

Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors 102, 202. For example, the one or more processors 102, 202 may include one or more layers (e.g., 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 functional layer such as a service data adaption protocol (SDAP)) may be implemented. One or more processors (102, 202) are one or more protocol data unit (protocol data unit (PDU)) and / or one or more service data unit (service data unit, SDU) according to the functions, procedures, proposals and / or methods disclosed in this document. ) Can be created. One or more processors 102 and 202 may generate messages, control information, data, or information according to functions, procedures, suggestions and/or methods disclosed herein. At least one processor (102, 202) is PDU, SDU, message, control information, data or signals containing information (e.g., baseband signals) in accordance with the functions, procedures, proposals and/or methods disclosed herein. Can be provided to one or more transceivers 106 and 206. One or more processors (102, 202) may receive signals (e.g., baseband signals) from one or more transceivers (106, 206), and PDU, SDU according to the functions, procedures, proposals and/or methods disclosed herein. , Messages, control information, data or information can be obtained.

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 by hardware, firmware, software, or a combination thereof. For 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 one or more processors 102 and 202. The functions, procedures, suggestions and/or methods disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. Firmware or software configured to perform the functions, procedures, proposals and/or methods disclosed herein are included in one or more processors 102, 202, or stored in one or more memories 104, 204, and 202). The functions, procedures, proposals and or methods disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or a set of instructions.

One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions. One or more memories 104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and/or combinations thereof. One or more memories 104 and 204 may be located inside and/or outside of one or more processors 102 and 202. In addition, one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies such as wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, radio signals/channels, and the like described in the functions, procedures, proposals, methods and/or operational flow charts disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 may be coupled with one or more processors 102, 202, and may transmit and/or receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices. In addition, one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices. In addition, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), one or more transceivers (106, 206) through one or more antennas (108, 208) functions and procedures disclosed in this document. It may be configured to transmit and/or receive user data, control information, radio signals/channels, etc. mentioned in the proposal, method and/or operation flow chart. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. It can be converted into a baseband signal. One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from a baseband signal to an RF band signal. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.

3 illustrates another example of a wireless device capable of performing implementation(s) of the present disclosure. Referring to FIG. 3, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 2, and various elements, components, units/units, and/or modules It can be composed of (module). For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver(s) 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, the transceiver(s) 114 may include one or more transceivers 106, 206 and/or one or more antennas 108, 208 of FIG. 2. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all operations of the wireless device. For example, the controller 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (Fig. 1, 100a), vehicles (Fig. 1, 100b-1, 100b-2), XR equipment (Fig. 1, 100c), portable equipment (Fig. 1, 100d), and home appliances. (Fig. 1, 100e), IoT device (Fig. 1, 100f), digital broadcast UE, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environment It may be implemented in the form of a device, an AI server/device (Fig. 1, 400), a BS (Fig. 1, 200), and a network node. The wireless device can be used in a mobile or fixed location depending on the use-example/service.

In FIG. 3, various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least some may be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130, 140) are connected through the communication unit 110. Can be connected wirelessly. In addition, each element, component, unit/unit, and/or module in the wireless device 100 and 200 may further include one or more elements. For example, the controller 120 may be configured with one or more processor sets. For example, the control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor. As another example, the memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.

In the present disclosure, at least one memory (e.g., 104 or 204) may store instructions or programs, and the instructions or programs are at least operably connected to the at least one memory when executed. It may cause one processor to perform operations according to some examples or implementations of the present disclosure.

In the present disclosure, a computer readable storage medium may store at least one instruction or computer program, and the at least one instruction or computer program is executed by at least one processor. It may cause one processor to perform operations according to some examples or implementations of the present disclosure.

In the present disclosure, a processing device or apparatus may include at least one processor and at least one computer memory connectable to the at least one processor. The at least one computer memory may store instructions or programs, and the instructions or programs, when executed, cause at least one processor operably connected to the at least one memory to cause some of the present disclosure. It may be to perform operations according to examples or implementations.

4 illustrates physical channels used in a 3GPP-based communication system, which is an example of a wireless communication system, and a signal transmission/reception process using them.

The UE, which has been powered on again while the power is turned off, or disconnected from the wireless communication system, first searches for a suitable cell to camp on (search cell) and synchronizes with the cell or the BS of the cell, etc. An initial cell search process is performed (S11). In the initial cell search process, the UE receives a synchronization signal block (SSB) (also referred to as an SSB/PBCH block) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE synchronizes with the base station based on the PSS/SSS and obtains information such as a cell identifier (identity, ID). In addition, the UE may obtain intra-cell broadcast information based on the PBCH. Meanwhile, the UE may receive a downlink reference signal (DL RS) during an initial cell search process to check a downlink channel state.

After completing the initial cell search, the UE can camp on the corresponding cell. After camping on the cell, the UE monitors the PDCCH on the cell and receives the PDSCH according to the downlink control information (DCI) carried by the PDCCH to obtain more specific system information (SI). Can be (S12).

SI is divided into a master information block (MIB) and a plurality of system information blocks (SIB). A brief description of MIBs and SIBs is as follows.

-The MIB includes information/parameters related to system information block type 1 (SystemInformationBlockType1, SIB1) reception and is transmitted through PBCH in SSB. Upon initial cell selection, the UE assumes that the half-frame with SSB is repeated in a 20ms period. The UE may check whether there is a control resource set (CORESET) for the Type0-PDCCH common search space based on the MIB. The Type0-PDCCH common search space is a kind of PDCCH search space, and is used to transmit a PDCCH for scheduling SI messages. If there is a Type0-PDCCH common search space, the UE based on information in the MIB (e.g., pdcch-ConfigSIB1) (i) a plurality of consecutive RBs constituting CORESET and one or more consecutive symbols and (ii) PDCCH opportunity (That is, a time domain location for PDCCH reception) can be determined. When the Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information on a frequency location in which SSB/SIB1 exists and a frequency range in which SSB/SIB1 does not exist.

-SIB1 includes information related to availability and scheduling (eg, transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, where x is an integer greater than 1). For example, SIB1 may inform whether SIBx is periodically broadcast or provided by a request of a UE by an on-demand method. When SIBx is provided by an on-demand method, SIB1 may include information necessary for the UE to perform an SI request. SIB1 is transmitted through the PDSCH, the PDCCH scheduling SIB1 is transmitted through the Type0-PDCCH common search space, and SIB1 is transmitted through the PDSCH indicated by the PDCCH.

-SIBx is included in the SI message and is transmitted through PDSCH. Each SI message is transmitted within a periodic time window (ie, SI-window).

The UE may perform a random access procedure to complete access to the BS (S13 to S16). For example, in a random access process, the UE transmits a preamble through a physical random access channel (PRACH) (S13), and a random access response to the preamble through a PDCCH and a corresponding PDSCH ( A random access response, RAR) may be received (S14). If reception of the RAR for the UE fails, the UE may attempt to transmit the preamble again. In the case of contention based random access, a contention resolution procedure including transmission of a PUSCH based on UL resource allocation included in the RAR (S15), and reception of a PDCCH and a corresponding PDSCH ( S16) can be performed.

After performing the above-described procedure, the UE may perform PDCCH/PDSCH reception (S17) and PUSCH/PUCCH transmission (S18) as a general uplink/downlink signal transmission process. The control information transmitted by the UE to the BS is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK/NACK (Hybrid Automatic Repeat and ReQuest Acknowledgement/Negative-ACK) (also referred to as HARQ-ACK), scheduling request (SR), channel state information (CSI), and the like. The CSI may include a channel quality indicator (CQI), a precoding matrix indicator (PMI), and/or a rank indicator. UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data are to be transmitted simultaneously. In addition, the UE may aperiodically transmit UCI through the PUSCH based on the request/instruction of the network.

5 illustrates a random access process that can be applied to the implementation(s) of the present disclosure. In particular, FIG. 5(a) illustrates a 4-step random access process, and FIG. 5(b) illustrates a 2-step random access process.

The random access process can be used in various ways for initial access, uplink synchronization adjustment, resource allocation, handover, radio link reconfiguration after radio link failure, and location measurement. The random access process is classified into a contention-based process and a dedicated (ie, non-contention-based) process. The contention-based random access process is generally used including initial access, and the dedicated random access process is used for handover, when downlink data arrives in the network, and when uplink synchronization is reset in case of location measurement. . In the contention-based random access process, the UE randomly selects a random access (RA) preamble. Accordingly, it is possible for a plurality of UEs to simultaneously transmit the same RA preamble, and thus a contention resolution process is required afterwards. On the other hand, in the dedicated random access procedure, the UE uses the RA preamble uniquely allocated by the BS to the UE. Therefore, the UE can perform a random access procedure without collision with other UEs.

Referring to FIG. 5(a), the contention-based random access process includes the following four steps. Hereinafter, messages transmitted in steps 1 to 4 may be referred to as Msg1 to Msg4, respectively.

-Step 1: The UE transmits an RA preamble through the PRACH.

-Step 2: The UE receives a random access response (RAR) from the BS through the PDSCH.

-Step 3: UE transmits UL data to BS through PUSCH based on RAR. Here, the UL data includes layer 2 and/or layer 3 messages.

-Step 4: The UE receives a contention resolution message from the BS through the PDSCH.

The UE may receive information about random access from the BS through the system information. If random access is required, the UE transmits Msg1 (eg, preamble) to the BS on the PRACH. The BS may distinguish each random access preamble through a time/frequency resource (RA Occasion, RO) and a random access preamble index (PI) in which the random access preamble is transmitted. When the BS receives the random access preamble from the UE, the BS transmits a RAR message to the UE on the PDSCH. For reception of the RAR message, the UE includes the scheduling information for the RAR message within a preset time window (eg, ra-ResponseWindow), CRC-masked L1/ with Random Access-RNTI (RA-RNTI) L2 control channel (PDCCH) is monitored. When receiving scheduling information through a PDCCH masked with RA-RNTI, the UE may receive a RAR message from the PDSCH indicated by the scheduling information. After that, the UE determines whether there is an RAR for itself in the RAR message. Whether there is a RAR for itself may be determined by whether there is a RAPID (Random Access preamble ID) for the preamble transmitted by the UE. The index of the preamble transmitted by the UE and the RAPID may be the same. The RAR is a corresponding random access preamble index, timing offset information for UL synchronization (eg, timing advance command (TAC), UL scheduling information (eg, UL grant) for Msg3 transmission), and UE temporary identification information ( Yes, including Temporary-C-RNTI, TC-RNTI) The UE receiving the RAR transmits Msg3 through the PUSCH according to the UL scheduling information and the timing offset value in the RAR. In Msg3, the ID of the UE (or In addition, Msg3 may contain RRC connection request-related information (eg, RRCSetupRequest message) for initial access to the network After receiving Msg3, the BS is a contention resolution message. Transmit Msg4 to the UE When the UE receives the contention resolution message and the contention resolution is successful, TC-RNTI is changed to C-RNTI In Msg4, the ID of the UE and/or RRC connection-related information (eg, RRCSetup Message).If the information transmitted through Msg3 and the information received through Msg4 do not match, or if Msg4 is not received for a certain period of time, the UE may report that contention resolution has failed and Msg3 may be retransmitted.

Meanwhile, the dedicated random access process includes the following three steps. Hereinafter, messages transmitted in steps 0 to 2 may be referred to as Msg0 to Msg2, respectively. The dedicated random access procedure may be triggered in the UE by the BS using a PDCCH (hereinafter, PDCCH order) for instructing transmission of an RA preamble.

-Step 0: The BS allocates an RA preamble to the UE through dedicated signaling.

-Step 1: The UE transmits an RA preamble through the PRACH.

-Step 2: The UE receives the RAR through the PDSCH from the BS.

The operations of steps 1 to 2 of the dedicated random access process may be the same as steps 1 to 2 of the contention-based random access process.

NR systems may require lower latency than conventional systems. In addition, a 4-step random access process may be undesirable for services that are particularly vulnerable to latency such as URLLC. A low latency random access process may be required within various scenarios of an NR system. When the implementation(s) of the present disclosure are performed with the random access process, in order to reduce the latency in the random access process, the implementation(s) of the present disclosure may be performed with the following two-step random access process. .

Referring to FIG. 5(b), the two-step random access process may consist of two steps: MsgA transmission from UE to BS and MsgB transmission from BS to UE. MsgA transmission may include transmission of an RA preamble through a PRACH and transmission of a UL payload through a PUSCH. In MsgA transmission, the PRACH and the PUSCH may be transmitted by time division multiplexing (TDM). Alternatively, in MsgA transmission, PRACH and PUSCH may be transmitted after frequency division multiplexing (FDM).

Upon receiving the MsgA, the BS may transmit MsgB to the UE. MsgB may include RAR for the UE.

An RRC connection request related message (eg, an RRCSetupRequest message) requesting to establish a connection between the RRC layer of the BS and the RRC layer of the UE may be included in the payload of MsgA and transmitted. In this case, MsgB may be used to transmit RRC connection related information (eg, RRCSetup message). Alternatively, an RRC connection request related message (eg, an RRCSetupRequest message) may be transmitted through a PUSCH transmitted based on a UL grant in the MsgB. In this case, RRC connection-related information (eg, RRCSetup message) related to the RRC connection request may be transmitted through the PDSCH associated with the PUSCH transmission after the PUSCH transmission based on MsgB.

6 illustrates a discontinuous reception (DRX) operation that may be applied to the implementation(s) of the present disclosure.

The UE may perform a DRX operation while performing a process and/or method according to the implementation(s) of the present disclosure. The UE in which DRX is configured may lower power consumption by discontinuously receiving DL signals. DRX may be performed in the RRC_IDLE state, the RRC_INACTIVE state, and the RRC_CONNECTED state. In the RRC_IDLE state and RRC_INACTIVE state, DRX is used for the UE to receive paging signals discontinuously. Hereinafter, DRX performed in the RRC_CONNECTED state will be described (RRC_CONNECTED DRX).

6 illustrates a DRX cycle for a UE in an RRC_CONNECTED state. Referring to FIG. 6, the DRX cycle is composed of On Duration and Opportunity for DRX. The DRX cycle defines the time interval at which the on duration is periodically repeated. The on duration represents a time period during which the UE performs PDCCH monitoring to receive the PDCCH. When DRX is configured, the UE performs PDCCH monitoring during on-duration. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the UE enters a sleep state after the on duration ends. Therefore, when DRX is configured, in performing the process and/or method according to the implementation(s) of the present disclosure, the UE may perform PDCCH monitoring/reception discontinuously in the time domain. For example, when DRX is set, a PDCCH reception occasion (eg, a slot having a PDCCH search space) in the present disclosure may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, in performing the process and/or method according to the implementation(s) of the present disclosure, the UE may continuously perform PDCCH monitoring/reception in the time domain. For example, when DRX is not set, a PDCCH reception timing (eg, a slot having a PDCCH search space) in the present disclosure may be continuously set. Meanwhile, regardless of whether or not DRX is set, PDCCH monitoring may be restricted in a time period set as a measurement gap.

The following table illustrates the UE process related to DRX. Referring to the following table, DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON/OFF is controlled by the DRX command of the MAC layer. When DRX is configured, the UE may perform PDCCH monitoring discontinuously, as illustrated in FIG. 6.

Here, MAC-CellGroupConfig includes configuration information necessary to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include configuration information about DRX. For example, MAC-CellGroupConfig may include information related to DRX as follows.

-Value of drx-OnDurationTimer: Defines the length of the start section of the DRX cycle

-Value of drx-InactivityTimer: Defines the length of the time interval in which the UE is awake after the PDCCH time when the PDCCH indicating initial UL or DL data is detected

-Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval from receiving the initial DL transmission until the DL retransmission is received.

-Value of drx-HARQ-RTT-TimerDL: After the grant for initial UL transmission is received, the length of the maximum time interval until the grant for UL retransmission is received is defined.

-drx-LongCycleStartOffset: Defines the time length and start point of the DRX cycle

-drx-ShortCycle (optional): Defines the time length of the short DRX cycle

Here, if any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerDL is in operation, the UE performs PDCCH monitoring at every PDCCH period while maintaining the awake state.

7 shows an example of a frame structure usable in a 3GPP-based wireless communication system.

The structure of the frame of FIG. 7 is only an example, and the number of subframes, the number of slots, and the number of symbols in the frame may be variously changed. In the NR system, OFDM numerology (eg, subcarrier spacing, SCS) may be set differently between a plurality of cells aggregated to one UE. Accordingly, the same number of symbols may be set differently. The (absolute time) duration of a time resource (eg, a subframe, a slot, or a transmission time interval (TTI)) consisting of may be set differently between aggregated cells, where the symbol is OFDM Symbol (or, cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) symbol), SC-FDMA symbol (or, discrete Fourier transform-spread-OFDM (discrete Fourier transform-spread-OFDM, DFT-s-OFDM) symbol) In the present disclosure, a symbol, an OFDM-based symbol, an OFDM symbol, a CP-OFDM symbol, and a DFT-s-OFDM symbol may be replaced with each other.

Referring to FIG. 7, in the NR system, uplink and downlink transmissions are organized into frames. Each frame has a duration Tf of 10 ms and is divided into two half-frames, each with a duration of 5 ms. Each half-frame consists of five subframes, and the period Tsf of a single subframe is 1 ms. Subframes are further divided into slots, and the number of slots in the subframe depends on the subcarrier spacing. Each slot consists of 14 or 12 OFDM symbols based on a cyclic prefix. In a normal cyclic prefix (CP), each slot is composed of 14 OFDM symbols, and in the case of an extended CP, each slot is composed of 12 OFDM symbols. The numerology depends on the exponentially scalable subcarrier spacing Δf = 2u*15 kHz. The following table shows the number of OFDM symbols per slot (Nslotsymb), the number of slots per frame (Nframe, uslot), and the number of slots per subframe (Nsubframe, uslot) according to the subcarrier spacing △f = 2u*15 kHz for the regular CP. Is shown.

The following table shows the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe according to the subcarrier spacing Δf = 2u*15 kHz for the extended CP.

8 illustrates a resource grid of a slot. A slot contains a plurality of (eg, 14 or 12) symbols in the time domain. For each neuron (e.g., subcarrier spacing) and carrier, a common resource block (CRB) indicated by higher layer signaling (e.g., radio resource control (RRC) signaling) Nstart, ugrid Starting at, a resource grid of Nsize,ugrid,x*NRBsc subcarriers and Nsubframe,usymb OFDM symbols is defined. Here, Nsize,ugrid,x is the number of resource blocks (RBs) in the resource grid, and the subscript x is DL for downlink and UL for uplink. NRBsc is the number of subcarriers per RB, and NRBsc is usually 12 in a 3GPP-based wireless communication system. There is one resource grid for a given antenna port p, subcarrier spacing configuration u, and transmission direction (DL or UL). The carrier bandwidth Nsize,ugrid for the subcarrier spacing setting u is given to the UE by a higher layer parameter (eg, RRC parameter) from the network. Each element in the resource grid for the antenna port p and subcarrier spacing u is referred to as a resource element (RE), and one complex symbol may be mapped to each resource element. Each resource element in the resource grid is uniquely identified by an index k in the frequency domain and an index l indicating a symbol position relative to a reference point in the time domain. In the NR system, the RB is defined by 12 consecutive subcarriers in the frequency domain.

In the NR system, RBs may be classified into common resource blocks (CRBs) and physical resource blocks (PRBs). CRBs are numbered from 0 upwards in the frequency domain for the subcarrier spacing setting u. The center of subcarrier 0 of CRB 0 for subcarrier spacing setting u coincides with'point A'which is a common reference point for resource block grids. PRBs are defined within a bandwidth part (BWP) and are numbered from 0 to NsizeBWP,i-1, where i is the number of the bandwidth part. The relationship between the common resource block nCRB and the physical resource block nPRB in the bandwidth part i is as follows: nPRB = nCRB + NsizeBWP,i, where NsizeBWP,i is a common resource block in which the bandwidth part starts relative to CRB 0. The BWP includes a plurality of consecutive RBs in the frequency domain. The carrier may contain up to N (eg, 5) BWPs. The UE may be configured to have more than one BWP on a given component carrier. Data communication is performed through an activated BWP, and only a predetermined number (eg, one) of BWPs set to the UE may be activated on the corresponding carrier.

A UE with carrier aggregation configured may be configured to use one or more cells. When a UE is configured to have a plurality of serving cells, the UE may be configured to have one or a plurality of cell groups. The UE may be configured to have a plurality of cell groups associated with different BSs. Alternatively, the UE may be configured to have a plurality of cell groups associated with a single BS. Each cell group of the UE is composed of one or more serving cells, and each cell group includes a single PUCCH cell in which PUCCH resources are configured. The PUCCH cell may be a Pcell or an Scell configured as a PUCCH cell among Scells of a corresponding cell group. Each serving cell of the UE belongs to one of the cell groups of the UE and does not belong to a plurality of cell groups.

9 illustrates slot structures that can be used in a 3GPP-based system. In all 3GPP based systems, e.g., NR systems, each slot is a self-contained structure that may include i) a DL control channel, ii) DL or UL data, and/or iii) a UL control channel. Can have For example, the first N symbols in the slot may be used to transmit the DL control channel (hereinafter, the DL control region), and the last M symbols in the slot may be used to transmit the UL control channel (hereinafter, the UL control region ). N and M are each non-negative integer. A resource region (hereinafter, a data region) between the DL control region and the UL control region may be used for DL data transmission or UL data transmission. The symbols of a single slot may be divided into group(s) of consecutive symbols that can be used as DL, UL, or flexible. Hereinafter, information indicating how each of the symbols of the slot is used is referred to as a slot format. For example, the slot format may define which symbols in the slot are used for UL and which symbols are used for DL.

When a serving cell is to be operated in a TDD mode, the BS may set a pattern for UL and DL allocation for the serving cell through higher layer (eg, RRC) signaling. For example, the following parameters can be used to set the TDD DL-UL pattern:

-Dl-UL-TransmissionPeriodicity providing the period of the DL-UL pattern;

-NrofDownlinkSlots providing the number of consecutive full DL slots at the beginning of each DL-UL pattern, wherein the full slot is a slot having only downlink symbols;

-NrofDownlinkSymbols providing the number of consecutive DL symbols at the beginning of the slot immediately following the last complete DL slot;

-NrofUplinkSlots providing the number of consecutive full UL slots within the end of each DL-UL pattern, wherein the full UL slot is a slot having only uplink symbols; And

-NrofUplinkSymbols providing the number of consecutive UL symbols in the end of the slot immediately preceding the first full UL slot.

Among the symbols in the DL-UL pattern, the remaining symbols that are neither set as DL symbols nor UL symbols are flexible symbols.

The UE that has received the configuration for the TDD DL-UL pattern, that is, the TDD UL-DL configuration (eg, tdd-UL-DL-ConfigurationCommon, or tdd-UL-DLConfigurationDedicated) through higher layer signaling, is slotted based on the configuration. Set the slot format for each slot across the fields.

Meanwhile, various combinations of a DL symbol, a UL symbol, and a flexible symbol for a symbol are possible, but a predetermined number of combinations may be predefined as slot formats, and the predefined slot formats can be identified by slot format indexes, respectively. I can. The following table illustrates some of the predefined slot formats. In the following table, D denotes a DL symbol, U denotes a UL symbol, and F denotes a flexible symbol.

In order to inform which of the predefined slot formats is used in a specific slot, the BS provides a combination of slot formats applicable to the corresponding serving cell for each cell through higher layer (e.g., RRC) signaling for a set of serving cells. A set of these may be set, and the UE may be configured to monitor a group-common PDCCH for a slot format indicator (SFI)(s) through higher layer (eg, RRC) signaling. Hereinafter, the DCI carried by the group-common PDCCH for SFI(s) is referred to as SFI DCI. DCI format 2_0 is used as the SFI DCI. For example, for each serving cell in the set of serving cells, the BS is the (start) position of the slot format combination ID (i.e., SFI-index) for the corresponding serving cell within the SFI DCI, the slot applicable to the serving cell. A set of format combinations, a reference subcarrier interval setting for each slot format in the slot format combination indicated by the SFI-index value in the SFI DCI may be provided to the UE. One or more slot formats are set for each slot format combination in the set of slot format combinations and a slot format combination ID (ie, SFI-index) is assigned. For example, when the BS wants to set a slot format combination with N slot formats, N slots among slot format indexes for slot formats predefined for the slot format combination (eg, see Table 4) Format indexes can be indicated. The BS informs the UE of the total length of the SFI-RNTI, which is the RNTI used for SFI, and the DCI payload scrambled with the SFI-RNTI to configure the UE to monitor the group-common PDCCH for SFIs. When the UE detects the PDCCH based on the SFI-RNTI, the UE may determine the slot format(s) for the corresponding serving cell from the SFI-index for the serving cell among SFI-indexes in the DCI payload within the PDCCH. .

Symbols indicated as flexible by the TDD DL-UL pattern configuration may be indicated as uplink, downlink or flexible by SFI DCI. Symbols indicated as downlink/uplink by TDD DL-UL pattern configuration are not overridden as uplink/downlink or flexible by SFI DCI.

If the TDD DL-UL pattern is not configured, the UE determines whether each slot is uplink or uplink and the symbol allocation within each slot is SFI DCI and/or DCI scheduling or triggering transmission of downlink or uplink signals (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, DCI format 2_3).

Hereinafter, physical channels that can be used in a 3GPP-based wireless communication system will be described in more detail.

PDCCH carries DCI. For example, the PDCCH (i.e., DCI) is a transmission format and resource allocation of a downlink shared channel (DL-SCH), resource allocation information for an uplink shared channel (UL-SCH), Located above the physical layer among the protocol stacks of UE/BS such as paging information for a paging channel (PCH), system information on the DL-SCH, and random access response (RAR) transmitted on the PDSCH. It carries resource allocation information for a control message of a layer (hereinafter, upper layer), a transmission power control command, and activation/release of configured scheduling (CS). DCI includes a cyclic redundancy check (CRC), and the CRC is masked/scrambled with various identifiers (e.g., radio network temporary identifier (RNTI)) according to the owner or usage of the PDCCH. For example, if the PDCCH is for a specific UE, the CRC is masked with a UE identifier (eg, cell RNTI (C-RNTI)) If the PDCCH is for paging, the CRC is masked with a paging RNTI (P-RNTI). If the PDCCH relates to system information (eg, system information block (SIB), then the CRC is masked with system information RNTI (system information RNTI, SI-RNTI)). If the PDCCH is for random access response, the CRC is Masked with random access RNTI (RA-RATI).

The PDCCH is transmitted through a control resource set (CORESET). One or more CORESET may be set to the UE. CORESET consists of a set of physical resource blocks (PRBs) with a time period of 1 to 3 OFDM symbols. PRBs constituting the CORESET and the CORESET duration may be provided to the UE through higher layer (eg, RRC) signaling. The set of PDCCH candidates within the set CORESET(s) is monitored according to the corresponding search space sets. Here, monitoring implies decoding (aka, blind decoding) each PDCCH candidate in the monitored DCI formats. The set of PDCCH candidates monitored by the UE is defined in terms of PDCCH search space sets. The search space set may be a common search space (CSS) set or a UE-specific search space (USS) set. Each CORESET setting is associated with one or more sets of search spaces, and each set of search spaces is associated with one CORESET setting. The search space set is determined based on the following parameters provided to the UE by the BS.

-controlResourceSetId: identifies the CORESET associated with the search space set.

-monitoringSlotPeriodicityAndOffset: indicates slots for PDCCH monitoring set as period and offset.

-monitoringSymbolsWithinSlot: indicates the first symbol(s) for PDCCH monitoring in slots for PDCCH monitoring.

-nrofCandidates: indicates the number of PDCCH candidates for each CCE aggregation level.

PDSCH is a physical layer UL channel for UL data transport. The PDSCH carries downlink data (e.g., a DL-SCH transport block), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM are applied. A codeword is generated by encoding a transport block (TB). The PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword may be mapped to one or more layers. Each layer is mapped to a radio resource together with a DMRS to generate an OFDM symbol signal, and is transmitted through a corresponding antenna port.

PUCCH means a physical layer UL channel for UCI transmission. PUCCH carries UCI (Uplink Control Information). UCI includes:

-Scheduling request (SR): This is information used to request UL-SCH resources.

-Hybrid automatic repeat request (HARQ)-acknowledgement (ACK): This is a response to a downlink data packet (eg, codeword) on the PDSCH. Indicates whether a downlink data packet has been successfully received by the communication device. HARQ-ACK 1 bit may be transmitted in response to a single codeword, and HARQ-ACK 2 bits may be transmitted in response to two codewords. The HARQ-ACK response includes positive ACK (simply, ACK), negative ACK (NACK), DTX or NACK/DTX. Here, the term HARQ-ACK is mixed with HARQ ACK/NACK, ACK/NACK, or A/N.

-Channel state information (CSI): This is feedback information on a downlink channel. CSI is channel quality information (CQI), rank indicator (rank indicator, RI), precoding matrix indicator (PMI), CSI-RS resource indicator (CSI-RS resource indicator, CRI), SS /PBCH resource block indicator, SSBRI), may include a layer indicator (layer indicator, LI). CSI may be divided into CSI part 1 and CSI part 2 according to the UCI type included in the CSI. For example, CRI, RI, and/or CQI for the first codeword may be included in CSI Part 1, and CQI for LI, PMI, and the second codeword may be included in CSI Part 2.

In this disclosure, for convenience, PUCCH resources set and/or indicated by the BS 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.

The PUCCH format may be classified as follows according to the UCI payload size and/or transmission length (eg, the number of symbols constituting the PUCCH resource). For information on the PUCCH format, Table 5 may be referred to.

(0) PUCCH format 0 (PF0, F0)

-Supportable 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)

-Transmission structure: PUCCH format 0 consists of only UCI signals without DMRS, and the UE transmits the UCI state 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 of PUCCH format 0. The UE transmits the PUCCH of PUCCH format 0 in the PUCCH resource for SR configuration corresponding to only when transmitting a positive SR.

-The setting for PUCCH format 0 includes the following parameters for the corresponding PUCCH resource: an index for initial cyclic transition, the number of symbols for PUCCH transmission, and the first symbol for the PUCCH transmission.

(1) PUCCH format 1 (PF1, F1)

-Supportable UCI payload size: up to K bits (e.g. K = 2)

-Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

-Transmission structure: DMRS and UCI are set/mapped to different OFDM symbols in the form of TDM. That is, the DMRS is transmitted in a symbol in which a modulation symbol is not transmitted. UCI is expressed by multiplying a specific sequence (eg, orthogonal cover code (OCC)) by a modulation (eg, QPSK) symbol. By applying a cyclic shift (CS)/OCC to both UCI and DMRS ( Code division multiplexing (CDM) is supported between multiple PUCCH resources (according to PUCCH format 1) within the same RB. PUCCH format 1 carries UCI of a maximum size of 2 bits, and the modulation symbol is time domain Is spread by an orthogonal cover code (OCC) (which is set differently depending on whether or not frequency hopping).

-The setting for PUCCH format 1 includes the following parameters for the corresponding PUCCH resource: index for initial cyclic transition, number of symbols for PUCCH transmission, first symbol for PUCCH transmission, orthogonal cover code Index for ).

(2) PUCCH format 2 (PF2, F2)

-Supportable UCI payload size: more than K bits (e.g. K = 2)

-Number of OFDM symbols constituting a single PUCCH: 1 to X symbols (e.g., X = 2)

-Transmission structure: DMRS and UCI are configured/mapped in the form of frequency division multiplex (FDM) within the same symbol. The UE transmits the coded UCI bits by applying only IFFT without DFT. PUCCH format 2 carries UCI of a bit size larger than K bits, and a modulation symbol is transmitted after FDM with DMRS. For example, the DMRS is located at symbol indexes #1, #4, #7, and #10 in a given resource block with a density of 1/3. A pseudo noise (PN) sequence is used for the DMRS sequence. Frequency hopping may be activated for 2-symbol PUCCH format 2.

-The setting for PUCCH format 2 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols for PUCCH transmission, the first symbol for the PUCCH transmission.

(3) PUCCH format 3 (PF3, F3)

-Supportable UCI payload size: more than K bits (e.g. K = 2)

-Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

-Transmission structure: DMRS and UCI are set/mapped to different symbols in the form of TDM. The UE transmits by applying DFT to the coded UCI bits. PUCCH format 3 does not support UE multiplexing for the same time-frequency resource (eg, the same PRB).

-The setting for PUCCH format 3 includes the following parameters for the corresponding PUCCH resource: the number of PRBs, the number of symbols for PUCCH transmission, the first symbol for the PUCCH transmission.

(4) PUCCH format 4 (PF4, F4)

-Supportable UCI payload size: more than K bits (e.g. K = 2)

-Number of OFDM symbols constituting a single PUCCH: Y ~ Z symbols (e.g., Y = 4, Z = 14)

-Transmission structure: DMRS and UCI are set/mapped to different symbols in the form of TDM. PUCCH format 4 can multiplex up to 4 UEs in the same PRB by applying OCC at the front end of the DFT and CS (or interleaved FDM (IFDM) mapping) for DMRS. In other words, the modulation symbols of UCI are transmitted after DMRS and TDM (Time Division Multiplexing).

-The configuration for PUCCH format 4 includes the following parameters for the corresponding PUCCH resource: the number of symbols for PUCCH transmission, length for orthogonal cover code, index for orthogonal cover code, first symbol for the PUCCH transmission.

The following table illustrates PUCCH formats. Depending on the PUCCH transmission length, it may be divided into short PUCCH (formats 0, 2) and long PUCCH (formats 1, 3, 4).

PUCCH resources may be determined for each UCI type (eg, A/N, SR, CSI). PUCCH resources used for UCI transmission may be determined based on UCI (payload) size. For example, the BS configures a plurality of PUCCH resource sets to the UE, and the UE may select a specific PUCCH resource set corresponding to a specific range according to the range of the UCI (payload) size (eg, the number of UCI bits). For example, the UE may select one of the following PUCCH resource sets according to the number of UCI bits (NUCI).

-PUCCH resource set #0, if number of UCI bits =< 2

-PUCCH resource set #1, if 2< number of UCI bits =< N1

...

-PUCCH resource set #(K-1), if NK-2 <number of UCI bits = <NK-1

Here, K is the number of PUCCH resource sets (K>1), and Ni is the maximum number of UCI bits supported by the PUCCH resource set #i. For example, PUCCH resource set #1 may be composed of resources of PUCCH format 0 to 1, and other PUCCH resource sets may be composed of resources of PUCCH format 2 to 4 (refer to Table 5).

The setting for each PUCCH resource includes a PUCCH resource index, a starting PRB index, a setting for one of PUCCH formats 0 to PUCCH 4, and the like. In the UE, the code rate for multiplexing HARQ-ACK, SR and CSI report(s) in PUCCH transmission using PUCCH format 2, PUCCH format 3, or PUCCH format 4 is set to the UE by the BS through the upper layer parameter maxCodeRate. . The upper layer parameter maxCodeRate is used to determine how to feed back UCI on PUCCH resources for PUCCH formats 2, 3 or 4.

When the UCI type is SR or CSI, the PUCCH resource to be used for UCI transmission in the PUCCH resource set may be configured to the UE by the network through higher layer signaling (eg, RRC signaling). When the UCI type is HARQ-ACK for the SPS (Semi-Persistent Scheduling) PDSCH, the PUCCH resource to be used for UCI transmission within the PUCCH resource set may be set to the UE by the network through higher layer signaling (e.g., RRC signaling). have. On the other hand, when the UCI type is HARQ-ACK for a PDSCH scheduled by DCI, a PUCCH resource to be used for UCI transmission within a PUCCH resource set may be scheduled based on DCI.

In the case of DCI-based PUCCH resource scheduling, the BS transmits the DCI to the UE through the PDCCH, and the PUCCH to be used for UCI transmission within a specific PUCCH resource set through the ACK/NACK resource indicator (ARI) in the DCI. Resources can be directed. ARI is used to indicate PUCCH resources for ACK/NACK transmission, and may also be referred to as a PUCCH resource indicator (PUCCH resource indicator, PRI). Here, DCI is a DCI used for PDSCH scheduling, and UCI may include HARQ-ACK for PDSCH. Meanwhile, the BS may set a PUCCH resource set consisting of PUCCH resources larger than the number of states that can be represented by the ARI using a (UE-specific) higher layer (eg, RRC) signal. At this time, the ARI indicates a PUCCH resource sub-set within the PUCCH resource set, and which PUCCH resource is to be used in the indicated PUCCH resource sub-set is transmission resource information for the PDCCH (e.g., PDCCH start control channel element (control channel element, CCE) index, etc.) based on an implicit rule.

The PUSCH carries uplink data (eg, UL-SCH TB) and/or uplink control information (UCI), and is transmitted based on a CP-OFDM waveform or a DFT-s-OFDM waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, if transform precoding is impossible (e.g., if transform precoding is disabled), the UE transmits a PUSCH based on the CP-OFDM waveform, and if transform precoding is possible (e.g., transform precoding When this is enabled), the UE may transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmission is dynamically scheduled by the UL grant in the DCI, or semi-static based on higher layer (eg, RRC) signaling (and/or layer 1 (layer 1, L1) signaling (eg, PDCCH))). static). Based on upper layer (e.g., RRC) signaling (and/or L1 (i.e., PHY) signaling), a semi-static scheduled resource assignment (i.e., assignment) is a set grant It is also called (configured grant). PUSCH transmission may be performed based on a codebook or a non-codebook.

The UE must have uplink resources available to the UE for UL-SCH data transmission, and must have downlink resources available to the UE for DL-SCH data reception. Uplink resources and downlink resources are assigned to the UE through resource allocation by the BS. Resource allocation may include time domain resource allocation (TDRA) and frequency domain resource allocation (FDRA). In this disclosure, uplink resource allocation is also referred to as an uplink grant, and downlink resource allocation is also referred to as a downlink allocation. The uplink grant is dynamically received on the PDCCH or in the RAR by the UE, or is set semi-persistently to the UE by RRC signaling from the BS. The downlink assignment is dynamically received on the PDCCH by the UE, or is semi-continuously set to the UE by RRC signaling from the BS.

In the UL, the BS may dynamically allocate uplink resources to the UE through PDCCH(s) addressed to a cell radio network temporary identifier (C-RNTI). The UE monitors the PDCCH(s) to find possible uplink grant(s) for UL transmission. In addition, the BS can allocate uplink resources using a grant set to the UE. Two types of set grants, type 1 and type 2, can be used. In the case of type 1, the BS directly provides a set uplink grant (including a period) through RRC signaling. In the case of type 2, the BS sets the period of the RRC configured uplink grant through RRC signaling, and the configured scheduling RNTI (configured scheduling RNTI, CS-RNTI) through the PDCCH (PDCCH addressed to CS-RNTI) The uplink grant may be signaled and activated or may be deactivated. For example, in the case of type 2, the PDCCH addressed as CS-RNTI indicates that the corresponding uplink grant can be implicitly reused according to a period set by RRC signaling until deactivation.

In the DL, the BS can dynamically allocate downlink resources to the UE through PDCCH(s) addressed with C-RNTI. The UE monitors the PDCCH(s) to find possible downlink assignments. In addition, the BS may allocate downlink resources to the UE using semi-static scheduling (SPS). The BS may set a period of downlink assignments set through RRC signaling, and may signal and activate the set downlink assignment through the PDCCH addressed to CS-RNTI, or deactivate it. For example, the PDCCH addressed to CS-RNTI indicates that the corresponding downlink assignment can be implicitly reused according to a period set by RRC signaling until deactivation.

Hereinafter, resource allocation by PDCCH and resource allocation by RRC will be described in more detail.

* Resource allocation by PDCCH: dynamic grant/allocation

The PDCCH can be used to schedule DL transmission on the PDSCH or UL transmission on the PUSCH. DCI on the PDCCH for scheduling DL transmission may include DL resource allocation including at least a modulation and coding format (e.g., modulation and coding scheme (MCS) index IMCS), resource allocation, and HARQ information related to the DL-SCH. have. The DCI on the PDCCH for scheduling UL transmission may include an uplink scheduling grant that includes at least a modulation and coding format, resource allocation, and HARQ information related to UL-SCH. The size and use of DCI carried by one PDCCH differs according to the DCI format. For example, DCI format 0_0, DCI format 0_1, or DCI format 0_2 may be used for scheduling a PUSCH, and DCI format 1_0, DCI format 1_1, or DCI format 1_2 may be used for scheduling a PDSCH. In particular, DCI format 0_2 and DCI format 1_2 have higher transmission reliability and lower latency than the transmission reliability and latency requirements guaranteed by DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format 1_1. It can be used to schedule transmissions with requirements. Some implementations of this disclosure may be applied to UL data transmission based on DCL format 0_2. Some implementations of this disclosure may be applied to DL data reception based on DCI format 1_2.

10 illustrates an example of PDSCH time domain resource allocation by PDCCH and an example of PUSCH time domain resource allocation by PDCCH.

The DCI carried by the PDCCH to schedule the PDSCH or PUSCH includes a time domain resource assignment (TDRA) field, and the TDRA field is a row to an allocation table for PDSCH or PUSCH. ) Provide the value m for index m+1. A predefined default PDSCH time domain allocation is applied as the allocation table for the PDSCH, or the PDSCH time domain resource allocation table set by the BS through the RRC signaling pdsch-TimeDomainAllocationList is applied as the allocation table for the PDSCH. A predefined default PUSCH time domain allocation is applied as the allocation table for the PDSCH, or the PUSCH time domain resource allocation table set by the BS through the RRC signaling pusch-TimeDomainAllocationList is applied as the allocation table for the PUSCH. The PDSCH time domain resource allocation table to be applied and/or the PUSCH time domain resource allocation table to be applied may be determined according to a fixed/predefined rule (eg, see 3GPP TS 38.214).

In the PDSCH time domain resource configurations, each indexed row is assigned a DL allocation-to-PDSCH slot offset K0, a start and length indicator SLIV (or directly a start position of a PDSCH in the slot (eg, start symbol index S) and an allocation length (eg , The number of symbols L)), defines the PDSCH mapping type. In the PUSCH time domain resource settings, each indexed row is a UL grant-to-PUSCH slot offset K2, a start position of a PUSCH in the slot (eg, start symbol index S) and an allocation length (eg, number of symbols L), and PUSCH mapping type. Defines K0 for PDSCH or K2 for PUSCH indicates a difference between a slot with a PDCCH and a slot with a PDSCH or PUSCH corresponding to the PDCCH.

SLIV is a joint indication of a start symbol S relative to the start of a slot having a PDSCH or PUSCH and the number L of consecutive symbols counted from the symbol S. In the case of the PDSCH/PUSCH mapping type, there are two types of mapping: one is mapping type A and the other is mapping type B. In the case of PDSCH/PUSCH mapping type A, a demodulation reference signal (DMRS) is located in a third symbol (symbol #2) or a fourth symbol (symbol #3) in a slot according to RRC signaling. In the case of PDSCH/PUSCH mapping type B, the DMRS is located in the first symbol allocated for PDSCH/PUSCH.

The scheduling DCI includes a frequency domain resource assignment (FDRA) field that provides assignment information on resource blocks used for PDSCH or PUSCH. For example, the FDRA field provides the UE with information about a cell for PDSCH or PUSCCH transmission, information about a BWP for PDSCH or PUSCH transmission, and information about resource blocks for PDSCH or PUSCH transmission.

* Resource allocation by RRC

As mentioned above, in the case of uplink, there are two types of transmission without a dynamic grant: an established grant type 1 and an established grant type 2. In the case of an established grant type 1, a UL grant is provided by RRC signaling and is a configured grant. Is saved. In the case of the configured grant type 2, the UL grant is provided by the PDCCH and is stored or cleared as an uplink grant configured based on L1 signaling indicating activation or deactivation of the configured uplink grant. Type 1 and Type 2 may be set by RRC signaling for each serving cell and for each BWP. Multiple settings can be active simultaneously on different serving cells.

When the configured grant type 1 is configured, the UE may receive the following parameters from the BS through RRC signaling:

-CS-RNTI for retransmission, cs-RNTI;

-Periodicity, which is the set grant type 1 period;

-TimeDomainOffset indicating an offset of a resource for a system frame number (SFN) = 0 in the time domain;

-A timeDomainAllocation value m, which provides a row index m+1 pointing to an allocation table, indicating a combination of a start symbol S, a length L, and a PUSCH mapping type;

-FrequencyDomainAllocation providing frequency domain resource allocation; And

-McsAndTBS providing IMCS indicating modulation order, target code rate and transport block size.

When setting the configuration grant type 1 for the serving cell by RRC, the UE stores the UL grant provided by RRC as a configured uplink grant for the indicated serving cell, and in timeDomainOffset and S (derived from SLIV) Initialize or re-initialize so that the configured uplink grant starts in the corresponding symbol and recurs with periodicity. After the uplink grant is configured for the configured grant type 1, the UE may consider that the uplink grant is associated with each symbol that satisfies the following and recurs (consider): [(SFN * numberOfSlotsPerFrame (numberOfSymbolsPerSlot) + ( slot number in the frame * numberOfSymbolsPerSlot) + symbol number in the slot] = (timeDomainOffset * numberOfSymbolsPerSlot + S + N * periodicity) modulo (1024 * numberOfSlotsPerFrame * numberOfSymbolsPerSlot), for all N >= 0, where numberOfSlotsPerFrame and numberOfSymbolsPerSlot are per frame The number of consecutive slots and consecutive OFDM symbols for each slot are shown, respectively (refer to Tables 2 and 3).

When the configured grant type 2 is configured, the UE may receive the following parameters from the BS through RRC signaling:

-Cs-RNTI, CS-RNTI for activation, deactivation, and retransmission; And

-Periodicity that provides the set grant type 2 period.

The actual uplink grant is provided to the UE by the PDCCH (addressed with CS-RNTI). After the uplink grant is configured for the configured grant type 2, the UE may consider that the uplink grant recurs in association with each symbol that satisfies the following: [(SFN * numberOfSlotsPerFrame * numberOfSymbolsPerSlot) + (slot number in the frame * numberOfSymbolsPerSlot) + symbol number in the slot] = [(SFNstart time * numberOfSlotsPerFrame * numberOfSymbolsPerSlot + slotstart time * numberOfSymbolsPerSlot + symbolstart time) + N * periodicity] modulo (1024 * numberOfSlotsPerFrame * numberOfSymbolsPerSlot), for all> 0 , Here, SFNstart time, slotstart time, and symbolstart time represent SFN, slot, and symbol of the first transmission opportunity of the PUSCH after the set grant is (re-)initialized, respectively (respectively), numberOfSlotsPerFrame and numberOfSymbolsPerSlot are The number of consecutive slots per frame and consecutive OFDM symbols per slot are shown, respectively (see Tables 2 and 3).

In the case of downlink, the UE may be configured with semi-persistent scheduling (SPS) for each serving cell and for each BWP by RRC signaling from the BS. In the case of DL SPS, DL allocation is provided to the UE by PDCCH, and is stored or removed based on L1 signaling indicating SPS activation or deactivation. When the SPS is configured, the UE may receive the following parameters from the BS through RRC signaling:

-Cs-RNTI, CS-RNTI for activation, deactivation, and retransmission;

-NrofHARQ-Processes providing the number of HARQ processes configured for SPS;

-A periodicity that provides a period of downlink allocation set for SPS.

After downlink assignment is set for SPS, the UE may sequentially consider that the N-th downlink assignment occurs in a slot that satisfies the following: (numberOfSlotsPerFrame * SFN + slot number in the frame ) = [(numberOfSlotsPerFrame * SFNstart time + slotstart time) + N * periodicity * numberOfSlotsPerFrame / 10] modulo (1024 * numberOfSlotsPerFrame), where SFNstart time and slotstart time are the first of the PDSCH after the set downlink allocation is (re-)initialized. The SFN, slot, and symbol of the th transmission are respectively represented, and numberOfSlotsPerFrame and numberOfSymbolsPerSlot represent the number of consecutive slots per frame and consecutive OFDM symbols per slot, respectively (see Tables 2 and 3).

The cyclic redundancy check (CRC) of the DCI format is scrambled with the CS-RNTI provided by the RRC parameter cs-RNTI, and the new data indicator field for the enabled transport block is set to 0. If there is, the UE confirms that the DL SPS allocated PDCCH or the configured UL grant type 2 PDCCH is valid for scheduling activation or scheduling cancellation. If all fields for the DCI format are set according to Table 6 or Table 7, validity confirmation of the DCI format is achieved. Table 6 illustrates special fields for validating DL SPS and UL grant type 2 scheduling activation PDCCH, and Table 7 exemplifies special fields for validating DL SPS and UL grant type 2 scheduling release PDCCH.

The actual DL allocation or UL grant for DL SPS or UL grant type 2, and the corresponding modulation and coding scheme are resource allocation fields in the DCI format carried by the corresponding DL SPS or UL grant type 2 scheduling activation PDCCH ( Yes, it is provided by a TDRA field providing a TDRA value m, an FDRA field providing a frequency resource block allocation, and a modulation and coding scheme field). When validity check is achieved, the UE considers the information in the DCI format to be valid activation or valid release of DL SPS or configured UL grant type 2.

11 illustrates a HARQ-ACK transmission/reception process.

Referring to FIG. 11, the UE may detect a PDCCH in slot n. Thereafter, the UE may receive the PDSCH in slot n+K0 according to the scheduling information received through the PDCCH in slot n, and then transmit UCI through the PUCCH in slot n+K1. Here, the UCI includes a HARQ-ACK response for the PDSCH. When the PDSCH is configured to transmit a maximum of 1 TB, the HARQ-ACK response may consist of 1-bit. When the PDSCH is set to transmit up to two transport blocks (TB), the HARQ-ACK response is composed of 2-bits when spatial bundling is not set, and 1-bits when spatial bundling is set. I can. When the HARQ-ACK transmission time point for a plurality of PDSCHs is designated as slot n+K1, the UCI transmitted in slot n+K1 includes HARQ-ACK responses for the plurality of PDSCHs.

In the case of a service having strict latency and reliability requirements (eg, URLLC service), the reliability of PUSCH/PDSCH transmission may have to be higher than that of conventional PUSCH/PDSCH transmission. In order to improve the reliability of PUSCH/PDSCH transmission, repeated transmission of PUSCH/PDSCH may be considered. For example, the BS may set the UE to repeat transmission of PUSCH/PDSCH in K consecutive slots, and the UE may repeat transmission/reception of TB in each slot over K consecutive slots. . In some examples or implementations of the present disclosure, the same symbol allocation may be applied across the K consecutive slots. In other words, the starting symbol index and the number of symbols for the PUSCH/PDSCH may be the same for each of the K consecutive slots. When the same resource allocation is used for repetition of PUSCH/PDSCH transmission, reliability or coverage of the PUSCH/PDSCH transmission can be secured. However, allowing only the same resource allocation for the PUSCH/PDSCH in consecutive slots for repetition of PUSCH/PDSCH transmission may make flexible resource allocation difficult. In addition, if the UE needs to perform PDCCH reception and PUSCH allocation in one slot in order to secure the latency requirement, only a few symbols in the second half of the slot will be available for PUSCH transmission, so a slot that follows the slot In this case, repetitive transmission may have to be delayed. In this case, when the UE needs to perform a certain number of repetitive transmissions to secure reliability, a large latency may occur in transmission/reception of the corresponding PUSCH/PDSCH. Therefore, for more flexible and efficient resource utilization and service support, and for faster and more robust UL channel transmission, PUSCH/PDSCH transmission is repeated at intervals smaller than slots to support transmission of multiple PUSCH/PDSCHs in one slot or slot boundary. ), it is good that the PUSCH/PDSCH can be transmitted. When a plurality of PUSCH/PDSCHs are transmitted in one slot, frequency hopping to change frequency resources between transmissions of PUSCH/PDSCH is additionally considered in order to secure reliability through frequency diversity. Can be.

The repetition of PUSCH/PDSCH can be applied to transmission of PUSCH/PDSCH based on a set grant as well as PUSCH/PDSCH transmission based on dynamic UL grant/DL allocation through PDCCH. In some examples or implementations of the present disclosure, in the case of PUSCH/PDSCH transmission based on a configured grant, resource allocation for one TB is always determined within one period of the configured grant. For example, a time duration for transmission of K repetitions for one TB does not exceed a time duration induced by a period P of a set grant. When repetitive transmission is performed based on a set grant, it is advantageous to sufficiently secure reliability when repetitive transmission is performed using the same resource allocation in each of the consecutive slots. Meanwhile, in some examples/implementations of the present invention, the UE transmits/receives PUSCH/PDSCH only at a predetermined position according to a redundancy version (RV) sequence among a plurality of PUSCH/PDSCH resources within a period of a set grant. . For example, in some examples/implementations, if the configured RV sequence is {0, 2, 3, 1}, the UE performs the initial transmission of the TB as the first of K transmission occasions (TOs) of K repetitions. Start at TO. In this case, in order to secure the reliability of PUSCH/PDSCH transmission, it may be necessary to secure a long time, or it may be difficult to set a short period using a plurality of PUSCH resources. In particular, when TB transmission is started in the middle of a plurality of PUSCH/PDSCH resources within the set grant period, that is, in the middle TO among TOs, it may be difficult to perform repetition a sufficient number of times.

Since the period of the set grant is closely related to the latency of the PUSCH/PDSCH, the operation using the set grant of a short period is allowed regardless of the transmission length of the PUSCH/PDSCH (e.g., the number of symbols occupied by the PUSCH/PDSCH). There may be a need. Alternatively, even when TB transmission is started in an intermediate PUSCH/PDSCH resource in the time domain among a plurality of PUSCH/PDSCH resources, it may be necessary to allow a sufficient number of repetitive transmissions. Therefore, an operation of repeatedly transmitting PUSCH/PDSCH at intervals shorter than that of a slot may be required.

In the case of URLLC, which is one of the representative scenarios of the next system, it has a user plane delay of 0.5ms and a low-latency, high-reliability requirement to transmit X bytes of data within 1ms within a 10^-5 error rate. In addition, eMBB generally has a large traffic capacity, but URLLC traffic has different characteristics that the file size is within tens to hundreds of bytes and is sporadic. Therefore, eMBB requires transmission that maximizes the transmission rate and minimizes the overhead of control information, and URLLC requires a short scheduling time unit and a reliable transmission method.

Depending on the application field or the type of traffic, the reference time unit assumed/used to transmit/receive a physical channel may vary. The reference time may be a basic unit for scheduling a specific physical channel, and the reference time unit may be changed according to the number of symbols constituting the corresponding scheduling time unit and/or subcarrier spacing. Some examples/implementations of the present disclosure are described based on a slot or a mini-slot as a reference time unit for convenience of description. The slot may be, for example, a basic scheduling unit used for general data traffic (eg, eMBB). The mini-slot may have a shorter time period than the slot in the time domain, and is a basic scheduling used in a special or communication method (e.g., URLLC or unlicensed band or millimeter wave) for a special purpose. It can also be a unit. However, the example(s)/implementation(s) of the present disclosure transmit/receive a physical channel based on a mini-slot for eMBB service, or transmit/receive a physical channel based on a slot for URLLC or other communication techniques. It can also be applied if you do.

In some scenarios of radio access technology, when radio transmission and resource allocation to be used for the UE are dynamically instructed through DCI, the UE is a semi-static DL/UL in which the link direction of the resource allocation indicated by the BS is different. It is not expected that a collision with a link direction indicated by a semi-static DL/UL configuration or a slot format indicator (SFI) will occur. For example, in some scenarios, the UE does not expect a symbol indicated as UL by semi-static DL/UL configuration or SFI DCI to be indicated as a downlink resource by DCI. As another example, in some scenarios, the UE does not expect a symbol indicated as a DL by semi-static DL/UL configuration or SFI DCI to be indicated as an uplink resource by DCI. In these scenarios, it is possible for the UE to fully trust the dynamically received uplink or downlink transmission instruction and perform an operation according to the corresponding instruction. In addition, in some scenarios, a resource region dynamically allocated by DCI is repeatedly used in a plurality of slots (e.g., a resource region dynamically allocated by DCI is applied to each of a plurality of consecutive slots) , For the initial transmission explicitly indicated by the DCI, the link direction of the initial transmission does not expect to collide with the link direction indicated by the semi-static DL/UL configuration or SFI, and the When repetitive transmission caused by DCI collides with a semi-static DL/UL configuration or a quasi-static DL/UL configuration or a link direction indicated by SFI, the UE performs the indicated operation except for the corresponding transmission/reception. Perform.

In some implementations of the present disclosure, the link direction indicated by semi-static DL/UL configuration may mean a link direction of DL or UL transmission configured by RRC signaling, system information, and/or UE-only RRC signaling. For example, link directions of symbols according to a TDD DL-UL pattern configured as UE-common or UE-only by RRC signaling may be link directions indicated by semi-static DL/UL configuration. As another example, a pattern of symbols invalid for DL/UL transmission by RRC signaling may be configured as UE-common or UE-only, and the link direction of symbols not invalid as DL/UL according to the pattern is semi-static It may be a link direction indicated by DL/UL configuration. When the BS provides the UE with a resource set that is not available for PDSCH or PUSCH (eg, through rate-matching pattern information), a DL not indicated as an invalid DL or UL symbol by the corresponding resource set Alternatively, the UL symbol may be a semi-statically configured DL/UL symbol.

Scenarios in which the BS allocates resources over a wide time domain including the slot boundary at once, and the UE or the BS performs transmission/reception only in a continuous and available resource period can be considered. . In these scenarios, it may be difficult for the BS to schedule transmission/reception by always avoiding unavailable resources. In other words, it may be difficult for the BS/UE to consider that available resources are always contiguous with each other even if the slot boundary is excluded. At this time, omitting the transmission/reception having a link direction different from the link direction of the resource indicated by the semi-static DL/UL configuration or the SFI among transmissions/receptions indicated by one scheduling by the BS It can cause a large performance degradation for transmission/reception. For example, the UE/BS divides the transmission duration of a total of 14 symbols into a transmission period of 10 symbols and a transmission period of 4 symbols in order to avoid slot boundaries, and the transmission duration of 10 symbols and 4 symbols In the case of performing transmission of the length, even if collision occurs in only one of the first 10 symbols, transmission is omitted in all of the 10 symbols and transmission is performed only in the latter four symbols. In the case of transmission where transmission reliability is important (eg, URLLC transmission), such performance degradation can be a major problem. This problem occurs not only when resource allocation including slot boundaries (hereinafter, multi-segment resource allocation), but also resource allocation for single transmission within a slot or multiple small resource allocations within a slot repeatedly used. I can. In order to avoid this problem, the present disclosure proposes a method of using for transmission using the remaining symbols excluding only some symbols without excluding the entire resource from transmission, even if some symbols of the symbols of the allocated resource are unusable. Hereinafter, implementations of the present disclosure are mainly described by taking multi-segment resource allocation as an example, but implementations of the present disclosure may be applied to other resource allocation methods.

Meanwhile, as described above, for URLLC, more flexible scheduling may be possible by setting/instructing resources regardless of slot boundaries or by repeatedly using resources in units of symbols. In using these various resource allocation methods, in order to maximize the advantages of each method, one of several methods may be selectively used. For example, when a certain condition is satisfied, a resource can be set/indicated irrespective of a slot boundary, and when the corresponding condition is not satisfied, a given resource may be used repeatedly in units of symbols. When considering the slot aggregation factor or TB excess for the configured uplink grant (Transport block repletion for uplink configured grant), the UE may support a plurality of improved resource allocation methods, and at this time, the effective resource allocation method You may need a method of choice.

In the present disclosure, when the UE can support a plurality of enhanced resource allocation methods for URLLC, a method for the UE to select an effective method among the plurality of enhanced resource allocation methods based on information transmitted from the base station to the UE, and Operation can be initiated. Through various examples of the present disclosure, the UE and the base station may select an effective resource allocation method while minimizing signaling overhead.

12 illustrates an uplink/downlink transmission process for various examples of the present disclosure.

Referring to FIG. 12, in S1201, a network (eg, at least one base station) may transmit resource allocation information to the UE. The resource allocation information may be transmitted through L1 signaling (eg, PDCCH) or higher layer signaling (eg, RRC).

In S1203, the UE may receive a message including resource allocation information from the network. For example, in order to receive downlink control information (DCI) including the resource allocation information, the UE may perform blind detection. The UE may decode the DCI including the resource allocation information. For example, the UE may attempt to decode PDCCH candidates (ie, blind detection or blind decoding) to detect DCI from at least one of the PDCCH candidates.

In S1205, the UE interprets the resource allocation information received from the network. Specifically, the UE may determine the validity of the resource allocation information through a value indicated by the received resource allocation information.

Meanwhile, in S1205, the UE may use a specific resource allocation analysis method or apply an additional parameter to resource analysis according to a value indicated by the resource allocation information. Here, the resource allocation analysis method may include a start and length indicator value (SLIV) analysis method as an example, and in this case, an additional parameter may be applied to the SLIV analysis. The SLIV interpretation method may mean interpreting allocated resources based on the slot offset indicated in the allocation table by the TDRA field included in the above-described DCI, the SLIV, and the mapping type.

Here, when the UE interprets the resource allocation information according to S1205 and the corresponding resource allocation information is interpreted as a plurality of resource allocations, the above-described uplink/downlink transmission process determines an RV to be transmitted or received for each resource allocation. It may further include a step S1207.

In S1209, the UE performs PDSCH reception or PUSCH transmission according to the interpreted resource allocation. In this case, the base station may perform PDSCH transmission or PUSCH reception on radio resources expected to be interpreted by the UE.

As described above, the UE may interpret the given resource allocation information to specify the location of the time/frequency resource in the same manner as the base station, and when the resource allocation information is interpreted as a plurality of time/frequency resources, TB and RV to be used can be determined.

According to various examples of the present disclosure, the UE and the base station may selectively use a plurality of TDRA methods. The TDRA method may be used to indicate the TDRA of the corresponding radio resource when a specific radio resource such as PUSCH, PDSCH or PUCCH is allocated between the UE and the base station. Various methods may be included in this TDRA method. As an example, the TDRA method may include a method of transmitting single or multiple resource scheduling, a method of generating, and/or a method of interpreting the same. In this case, the one resource allocation includes at least two or more elements of one starting point (eg, start symbol), one end point (eg, end symbol), and one length (symbol length or number of symbols) in the time domain. It could be information. As an example, the TDRA method may include a method of transmitting, generating, and/or interpreting one or more SLIVs.

Meanwhile, the aforementioned resource allocation methods may include the following resource allocation methods.

-Resource allocation based on slot structure (Single or multiple resource scheduling based on slot structure)

-Resource allocation based on sub-slot structure (Single or multiple resource scheduling based on sub-slot structure)

-Resource allocation based on symbol structure (Single or multiple resource scheduling based on symbol structure)

The allocation of one or more resources based on the slot structure is a method of using a slot structure in delivering resource allocation information. As an example, resource allocation information may be limited to one slot. Specifically, the starting point of the resource may be determined based on the starting point of the slot, the end point of the resource may be determined within the slot where the resource started, or the length of the resource may be determined not to exceed the slot boundary. In this case, the slot may be composed of 14 OFDM symbols based on the regular cyclic prefix.

The allocation of one or more resources based on the sub-slot structure is a method of configuring and using at least one sub-slot smaller than one slot and equal to or larger than one symbol in delivering resource allocation information. As an example, the starting point of the resource may be determined based on the starting point of the subslot, the length of the resource may be determined in units of subslots, the end point of the resource may not exceed other subslots, or the resource may have two or more subslots. It can be determined not to span.

The allocation of one or more resources based on the symbol structure is a method in which resource allocation information is not limited even if a slot structure or a sub-slot structure is used. As an example, the starting point of the resource is determined based on the starting point or the ending point of the slot or subslot, but the length of the resource may be set regardless of the length or boundary of the slot or subslot. Alternatively, the starting point of the resource may also be set regardless of the slot or sub-slot. Alternatively, the starting point or the ending point of the resource may be determined based on the end point or the starting point of the previous or other resource allocation.

Meanwhile, the base station may transmit the above-described resource allocation information to the UE through L1 signaling or higher layer signaling. In this case, one message (eg, resource allocation information) transmitted to the UE may include a plurality of resource allocations. In this case, one SLIV may be interpreted as a plurality of resource allocations.

The UE and the base station may perform transmission or reception using a given or set resource allocation as it is, or may perform resource allocation or interpret it by additionally applying other information for more flexible and efficient resource allocation. As an example, resource allocation may be repeated by additionally applying a repetition factor (reptK) or a slot aggregation factor. Here, the repetitive transmission factor may be an integer equal to or greater than 1 and may mean the number of repetitive transmissions. Specifically, when there is a numberofrepetitions item in the allocation table, the repetition transmission factor may be a numberofrepetitions value corresponding to a specific row index indicated by DCI in the allocation table. When the numberofrepetitions item does not exist in the allocation table and a slot association factor, which is an upper layer parameter, is set to the UE, the repetition transmission factor may be a value indicated by the slot association factor. If the numberofrepetitions item does not exist in the allocation table and the slot association factor, which is an upper layer parameter, is not set to the UE, the repetition transmission factor may be 1.

Alternatively, when the UE or the base station additionally applies other information such as a repetition transmission factor to one resource allocation as described above to perform resource allocation or interpret it, or a given resource allocation is a slot boundary, a UL/DL switching point (UL /DL switching point) and a reserved resource (reserved resource), etc., including elements that are difficult to use for transmission or reception, the UE and the base station can re-interpret the given or set resource allocation (re-interpretation). As an example, the UE and the base station reinterpret a plurality of resource allocations into one resource allocation, or reinterpret one resource allocation into a plurality of resource allocations, or some of the allocated resources or all allocated resources (e.g. , Symbol), or a combination thereof.

Hereinafter, when the UE can use the above-described plurality of TDRA methods and/or a plurality of repetitive transmission factors and/or a plurality of reinterpretation methods and the base station can indicate or set this to the UE, the overhead of the control signal In order to perform effective scheduling without increasing the UE automatically assumes and performs any one of a plurality of TDRA methods, a plurality of repetition transmission factors, and a plurality of reinterpretation methods or a specific combination thereof according to a specific condition. Explain how.

1. Selection Criteria for TDRA Methods

When the UE can use a plurality of TDRA methods (eg, T1, T2, T3, ..., T_N), when the UE interprets the resource allocation information given or set from the base station, the following examples 1-1 to 1- Any one of a plurality of TDRA methods may be selected according to one or a combination of five. On the other hand, the TDRA method is a method in which a UE obtains one or more radio resource allocations through a given resource allocation message. Can include. As an example, a method of obtaining one radio resource allocation in a slot using an explicitly given start symbol S and number of symbols L, or a slot boundary using a given start symbol S and number of symbols L while ignoring the slot boundary, It may be a method of obtaining a plurality of radio resource allocations that do not include elements that are difficult to use for transmission or reception such as UL/DL switching points and reserved resources.

Accordingly, the UE or the base station may change the configuration of a message including resource allocation according to the selected TDRA method, or interpret a message having the same configuration as a different resource allocation. Specifically, the UE or the base station selects a 7-bit bit string having the same value included in the message including the resource allocation according to the selected TDRA method, resource allocation based on slot structure, resource allocation based on subslot structure It can be interpreted as any one of resource allocation based on symbol structure.

<Example 1-1>

The UE may determine which TDRA method to use according to a bit field/parameter included in the resource allocation information transmitted through L1 signaling or higher layer signaling from the base station.

<Example 1-2>

When the UE and the base station perform the TDRA method based on a predefined or set table, the UE and the base station may pre-determine or be configured to use a specific TDRA method according to a specific index or a specific index range of the table.

13 is a flowchart of a table-based TDRA method according to an example of the present disclosure.

Referring to FIG. 13, in S1301, the UE may receive an allocation table from the base station through higher layer signaling. As an example, the allocation table for UL resources may be configured through the upper layer parameter pusch-TimeDomainAllocationList as described above. Each row of the allocation table may define a slot offset, SLIV and PUSCH mapping type. Here, SLIV is a value that can be represented by 7-bits and can be a value within the range of 0 to 127.

In S1303, the UE may receive a DCI including a TDRA field indicating a specific row index of the allocation table through L1 signaling from the base station.

In S1305, the UE may analyze allocation resources based on a slot offset corresponding to a specific row index indicated by a received TDRA field among the rows of the allocation table, and SLIV and PUSCH mapping types. As an example, when the UE interprets SLIV corresponding to a specific row index, when the number of symbols L of uplink or downlink resources associated with SLIV is limited to the range 0 <L <= 14-S, (L-1 ) If <= 7, the start symbol S and the number of symbols L are defined based on Equation 1, and if the number of symbols L is 7 <(L-1) <= 13, the start symbol S and the number of symbols L are based on Equation 2 Can be defined.

[Equation 1]

SLIV = 14 * (L-1) + S

[Equation 2]

SLIV = 14 * (14-L + 1) + (14-1-S)

As a more specific example of the table-based TDRA method, when the UE and the base station perform the TDRA method based on a predefined or set table, the UE may determine what data field values are used when indicating or setting the index of the corresponding table. You can decide whether to use the TDRA method. In addition, the base station can expect such an operation and instruct or set the TDRA to the UE. Illustratively, the bit size of the TDRA field included in DCI or RRC signaling is composed of ceil (log2 (the number of rows in table)) function + X bits, and the most significant bit (MSB) or least significant bit (LSB) of the X bits bit) can be used to determine which TDRA method to use.

As yet another more specific example of the table-based TDRA method, residual representations among bit representations that may represent the starting symbol S and the number of symbols L in TDRA may be used. Here, the expression values of bits are values that can be indicated by a bit string. For example, since a 7-bit bit string may have a value of 0 to 127, one of a maximum of 128 values may be indicated. Accordingly, there may be a maximum of 128 SLIVs that can be indicated by a 7-bit bit string if there is no restriction on the start symbol and the number of symbols.

In addition, the residual expression values are excluded from the expression values of the bit, or when the residual expression values are indicated or set, even if a different TDRA method is applied to the residual expression values, it means the expression values of the bit that hardly affect the existing scheduling. It can be. For example, when one slot consists of 14 symbols, since a 7-bit RRC signaling or DCI field may be used to indicate SLIV, the expression values of the bits may be 0 to 127. In this case, when the range of the number of symbols L associated with SLIV is limited to 0 <L <= 14-S as described above, there may be a total of 105 SLIVs, and expression values 0 out of 0 to 127 expression values by 7-bit To 104 are used to indicate SLIV (ie, only 105 TDRAs are used), and the remaining expression values 105 to 127 correspond to residual expression values. In scenarios in which the range of the number of symbols L associated with SLIV is limited to 0 <L <= 14-S when the base station sets the TDRA entries available to the UE, that is, when setting the allocation table to the UE, among the expression values 0 to 104 One or more expression values may be set to the UE. Accordingly, the UE and the base station may define and additionally use the remaining 23 SLIVs as residual expression values.

The UE and the base station may additionally map a specific TDRA to the 23 residual expression values so that the corresponding residual expression values indicate a characteristic TDRA. Alternatively, values that can be indicated by 14 bits representing a resource in units of 1 symbol may be additionally mapped to a specific TDRA.

As an example for using the residual expression values, the UE and the base station can interpret the residual expression values as different resource allocations, so that 105 SLIVs when the range of the number of symbols L is limited to 0 <L <= 14-S It is not possible to predefine or set a separate allocation table including SLIVs when L> 14-S, not an allocation table based only on s. Hereinafter, for convenience of explanation, an allocation table including SLIVs when the range of the number of symbols L is limited to 0 <L <= 14-S is referred to as a first allocation table, and the range of the number of symbols L is L> 14-S An allocation table including SLIVs at the time of is referred to as a second allocation table. In addition, SLIVs included in the first allocation table and SLIVs included in the second allocation table may have the same meaning as the term SLIV set.

The first allocation table can be set to the UE through higher layer signaling as described above, and includes SLIVs when the range of the number of symbols L is limited to 0 <L <= 14-S as shown in Table 8 below. I can.

Table 8 may additionally include a slot offset value, a mapping type, and a repetition factor value for each PDSCH/PUSCH.

Like the first allocation table, the second allocation table may be set to the UE through higher layer signaling. In addition, according to an example of the present disclosure, the second allocation table includes 23 SLIVs (ie, residual expression values) excluding the above-described 105 SLIVs, and a start symbol S and a symbol number L corresponding to each of the SLIVs. I can.

When the first allocation table and the second allocation table including the start symbol S and the number of symbols L corresponding to each of the remaining 23 SLIVs and SLIVs excluding the 105 SLIVs described above are set to the UE, the UE is the second allocation table When a specific SLIV is received among the SLIVs included in the SLIV, the SLIV can be interpreted through a value explicitly indicated by a predefined or set second allocation table rather than interpreting the SLIV based on Equations 1 and 2. have. In addition, when a specific SLIV is received among SLIVs included in the first allocation table, the SLIV may be analyzed based on Equations 1 and 2.

Alternatively, according to another example of the present disclosure, the second allocation table includes at least one of newly defined SLIVs of 0 to 127 and a start symbol corresponding to each of the SLIVs when the range of the number of symbols L is L> 14-S. It may include S and the number of symbols L.

The following is an example of a second allocation table including at least one of SLIVs of 0 to 127 newly defined when the range of the number of symbols L is L> 14 -S.

All of the SLIVs included in Table 9 are at least one of the newly defined SLIVs of 0 to 127 when the range of the symbol number L is L> 14 -S. Meanwhile, the values included in Table 9 are only an example of the present disclosure, and a table related to the residual expression values may be predefined or set including various SLIVs. This second allocation table includes at least one of at least one SLIV used when constrained by 0 <L <= 14-S and at least one SLIV used when not constrained by 0 <L <= 14-S Is done. In this case, at least one SLIV used when 0 <L <= 14-S in the second allocation table is constrained may be set to be mapped to one of bit representation values 0 to 104.

In this way, when the second allocation table including SLIVs of 0 to 127 newly defined when the range of the number of symbols L is L> 14-S is set, the UE interprets the SLIV based on the first allocation table ( That is, a method of interpreting SLIV based on Equation 1 and 2) or a specific TDRA method may be assumed as a basic operation. For example, if the SLIV included in the second allocation table is configured through indication or higher layer signaling, the UE interprets the SLIV and resource allocation information based on the second allocation table, and is not included in the second allocation table. When SLIV is indicated or set, resource allocation information may be interpreted based on the first allocation table or a specific TDRA method may be used. That is, when the indicated or set SLIV is included in both the first allocation table and the second allocation table, the UE may interpret the resource allocation information based on the second allocation table. In addition, it may be indicated or set so that the row index for each allocation table is distinguished.

Alternatively, the UE and the base station apply the corresponding interpretation method when a separate interpretation method is set for the SLIVs when L> 14-S, and if not set, resource allocation information based on the first allocation table. Interpretation or specific TDRA methods may be used.

Meanwhile, since the plurality of SLIVs included in the first allocation table are SLIVs when the range of the number of symbols L is limited to 0 <L <= 14-S, as described above, a plurality of SLIVs included in the first allocation table The uplink or downlink resources associated with each of them may be resources included in one slot (14 symbols). In addition, the second allocation table includes a start symbol S and a symbol number L corresponding to each of the remaining 23 SLIVs and SLIVs excluding 105 SLIVs that may be included in the first allocation table, or the range of the number of symbols L When L> 14-S, when the starting symbol S corresponding to each of the newly defined SLIVs and SLIVs of 0 to 127 and the number of symbols L is included, the upward associated with each of the plurality of SLIVs included in the second allocation table The link or downlink resource may be a resource included in a plurality of slots.

Through the above-described Example 1-2, the UE and the base station can use SLIVs that are difficult to use when 1 slot is 14 symbols, and through this, the base station can instruct or set the TDRA divided based on the slot boundary to the UE, The UE may receive or receive such a TDRA.

As another example, when the UE and the base station perform TDRA based on a set or predefined table, which TDRA method to use may be determined based on one column or data field of the corresponding table. The base station can expect this operation and instruct or configure the TDRA to the UE. As an example, when SLIV is set to the UE in the form of a table, an index (or entry) of each table is indicated not only by SLIV, slot offset and/or DMRS mapping type, but also by one data field. Can be or can be included. The UE and the base station can determine which TDRA method to use through the data field.

As another example, in the case of not using 1 symbol duration resource allocation, a value that can be indicated by 14 bits representing a resource of 1 symbol unit included in 1 slot of 14 symbols length Can additionally be mapped to other TDRAs. As an example, when a SLIV indicating a resource in units of 1 symbol is given, the UE applies the starting symbol S derived therefrom as it is, but the number of symbols of the resource can be derived through the repetition transmission factor. In this case, since the repetitive transmission factor does not indicate the number of repetitive transmissions, the UE may assume the number of repetitive transmissions as a specific value (eg, 1).

Meanwhile, in the above-described example, the candidate lengths for resource allocation that can be indicated by the repetition transmission factor are the same candidate length regardless of a given start symbol S, or a plurality of different candidate lengths for each start symbol S It may be configured or indicated to the UE or predetermined through L1 signaling and/or higher layer signaling of the base station. As an example, the candidate length may be any one of 4, 7, 14, and 28 symbols.

According to Example 1-2 of the present disclosure described above, resource allocation information that does not affect the existing scheduling or has a small influence even if the base station and the UE are excluded or other TDRA methods are applied (e.g., resource allocation in units of one symbol A separate data field or parameter (eg, a repetition transmission factor) may be used for values that can be indicated by bits of SLIV) indicating. Upon receiving the above-described resource allocation information, the UE assumes that the separate data field or parameter is a specific value rather than an existing indication or set value, and may derive the length of the resource from one or more candidate lengths using the specific value. . Through this, the UE may be indicated or configured from the base station for TDRA (14 symbols or more) crossing the slot boundary, and more flexible resource allocation between the base station and the UE may be possible.

<Example 1-3>

When there is a specific period or interval P for acquiring and/or allocating a specific resource, different TDRA methods may be used based on the period or interval and X slot/symbol/subframe. Here, as an example of the period or interval, the interval between SPS/grant-free period (periodicity of SPS/grant-free), SR/CSI configuration period (periodicity of SR/CSI configuration) and/or PDCCH opportunities ( interval between PDCCH occurrences), etc. may be included.

Specifically, when two TDRA methods (T1, T2) exist, T1 may be used when P <X, and T2 may be used in other cases (eg, P >= X). In this case, X may be 1 or another predetermined value. In addition, when three or more TDRA methods can be used, a plurality of X, [X_1, X_2, ... ] Can be used. The plurality of Xs may be used to distinguish three or more TDRA methods. As an example, when three TDRA methods (T1, T2, T3) exist, T1 when 0< P <X_1, T2 when X_1 ≤ P <X_2, and in other cases (eg P >= X_2) T3 can be used.

<Example 1-4>

The UE may determine the TDRA method according to the DMRS symbol position or the element determining the DMRS symbol position. As an example, the UE may select a specific TDRA method according to the PUSCH/PDSCH DMRS configuration indicated or set by the UE among a plurality of TDRA methods. Here, elements related to the DMRS that may be considered to implement Example 1-4 may be as follows.

-PUSCH/PDSCH mapping type

-Reference position of DMRS symbol positioning: e.g. beginning of the slot or beginning of the RA

-DMRS configuration type

-Cyclic shift

-Whether to set UE-specific values when creating a sequence

<Example 1-5>

The UE and the base station may select the TDRA method according to the type or purpose of a message in which resource allocation is indicated. As an example, the UE may determine which TDRA method to select according to the purpose of a message in which resource allocation is indicated or set. Specifically, the UE and the base station may use different TDRA methods in the case of a TDRA for a configured grant PUSCH or PDSCH and a TDRA for a dynamic PUSCH or PDSCH.

As another example, the indicated resource allocation message includes an indicator associated with a service type and/or QoS and/or a block error rate (BLER) target, or distinguishes a service type and/or QoS and/or a BLER target. When other information that is present is included in the message, resource allocation information for using different TDRA methods according to the service type and/or QoS and/or BLER target may be included in the resource allocation message.

As another example, when the indicated resource allocation message is transmitted by L1 signaling, the TDRA method may be determined according to the type of message (eg, DCI format). Specifically, when a different DCI format is used for each service, different TDRA methods may be used according to the DCI format. Alternatively, when a message is delivered by DCI, different TDRA methods may be used according to the RNTI used for CRC scrambling of the message.

It is obvious that the various examples according to Examples 1-1 to 1-5 can determine a characteristic operation related to other resource allocation in determining which one of a plurality of TDRA methods will be used. As an example, whether to apply the repetition transmission factor of the UE through Examples 1-1 to 1-5, and which repetition transmission factor to be applied in the case of application is determined, or reinterpretation of the resource allocation information of the UE Whether to perform can be determined.

2. Selection criteria for repetitive transmission factor

When the UE can use different repetition factors of one or more repetitive transmission factors (eg, K1, K2, K3, …, K_N), when the UE interprets a given resource allocation message, the following example 2- One or a plurality of repetition transmission factors to be applied may be selected from among a plurality of repetition transmission factors according to one or a plurality of combinations of 1 to 2-8, or it may be determined whether to apply the repetition transmission factor.

Here, the repetition transmission factor may include information necessary to repeat the allocated resource in units of slots, subslots, or symbols as described above.

As an example, the UE may receive one of {1, 2, 3, 4, 7, 8, 12, 16} as a repetition transmission factor through Examples 2-1 to 2-8 below. Alternatively, the UE may receive a plurality of repetition transmission factors through L1 signaling or higher layer signaling of the base station. As an example, the UE may explicitly receive one repetition factor in the form of a specific DCI field or an RRC parameter, or the repetition factor included in a predetermined or configured table through an index indicated by a specific DCI field. You can also choose a value.

In addition, the UE may receive repetitive transmission from the base station through L1 signaling or higher layer signaling. As an example, a repetition transmission factor having a value of 1 may be indicated/set, or a separate DCI field or RRC parameter indicating whether the repetition transmission factor is applied may be indicated or set. On the other hand, even if the UE is indicated or configured with a repetition transmission factor greater than 1, the repetition transmission factor of 1 is always used without applying the corresponding repetition transmission factor based on the separate DCI field or RRC parameter, or repetition transmission is performed. I can't.

Meanwhile, by applying the selected repetition transmission factor to transmission or reception, the UE may repeatedly transmit or receive PDSCH reception or PUSCH transmission allocated to the UE by the value of the repetition transmission factor. As described above, such repeated transmission may be performed in units of slots, subslots, or symbols.

Alternatively, the repetition transmission factor may mean other information that can be additionally applied for more flexible and efficient resource allocation in addition to one or a plurality of resource allocation information. For example, the repetition transmission factor may be information for changing not only the number of repetitions but also the length, start point, and/or end point in the time domain of resource allocation according to given or predetermined information. As an example, when the UE can change the length in the time domain of resource allocation determined through a given specific upper layer parameter to be longer, the specific higher layer parameter may also be included as a repetition transmission factor.

<Example 2-1>

The UE may determine whether to apply a repetition factor or which repetition factor to use according to a bit field/parameter included in the resource allocation information transmitted through L1 signaling or higher layer signaling from the base station.

<Example 2-2>

When the UE and the base station perform the TDRA method based on a predefined or set table, the UE and the base station determine whether to apply a repetition factor or use a specific repetition factor according to a specific index or a specific index range of the table. I can. In this case, since other parameters related to the repetition transmission factor may be indicated in the table together, it may be possible to dynamically indicate the repetition transmission factor with less DCI overhead than indicating a combination of all values.

As an example, when the UE and the base station perform the TDRA method based on a predefined or set table, the UE determines which repetition factor to use as part of the data field value used when indicating or setting the index of the table. I can. In addition, the base station can expect such an operation and instruct or set the TDRA to the UE. Exemplarily, the bit size of the TDRA field included in DCI or RRC signaling is configured as ceil (log2 (the number of rows in table)) function + X bits, and a certain repetition transmission factor is applied through the MSB or LSB of X bits. It can be decided what to do.

As another example, according to values that can be indicated by bits related to TDRA resource allocation information, it is determined whether to apply a repetition factor or which repetition factor to use, and for this purpose, a separate table is predefined or configured to the UE. I can. The separate table may include whether the repetition transmission factor is applied or which repetition transmission factor is used according to each SLIV or SLIV range. The following is an example of a separate table that can be predefined or set in relation to the repetition transmission factor.

Values included in Table 10 are only examples of the present disclosure, and may be replaced with other values. Values not included in Table 10 may indicate that the repetition transmission factor is not applied, or may be a repetition transmission factor used for slot combining.

As another example, when the UE and the base station perform TDRA based on a set or predefined table, it is possible to determine which repetition factor to use based on one column or data field of the table. The base station can expect this operation and instruct or configure the TDRA to the UE. As an example, when SLIV is set to the UE in the form of a table, an index (or entry) of each table may be indicated or included in addition to SLIV, slot offset and/or DMRS mapping type, as well as one data field. . The UE and the base station can determine which repetition factor to use through the data field.

<Example 2-3>

When there is a specific period or interval P for acquiring and/or allocating a specific resource, different repetition factors may be used based on the period or interval and X slots/symbols/subframes. Here, as an example of the period or interval, the SPS/grant-free period, the SR/CSI configuration period, and/or the interval between PDCCH opportunities may be included.

Specifically, when three or more TDRA methods can be used, a plurality of X, [X_1, X_2, ... ] Can be used. The plurality of Xs may be used to select a specific one of three or more repetitive transmission factors. As an example, when three repetitive transmission factors (K1, K2, K3) exist, K1 when 0< P <X_1, K2 when X_1 ≤ P <X_2, and in other cases (e.g., P >= X_2) K3 can be used.

<Example 2-4>

The UE may determine whether to apply the repetition transmission factor or which repetition transmission factor to use according to the DMRS symbol position or the factor determining the DMRS symbol position. As an example, the UE may select one repetitive transmission factor according to the PUSCH/PDSCH DMRS configuration indicated or set by the UE from among a plurality of repetition transmission factors. Here, elements related to the DMRS that may be considered to implement Example 2-4 may be as follows.

-PUSCH/PDSCH mapping type

-Reference position of DMRS symbol positioning: eg, starting point of slot or RA

-DMRS setting type

-Cyclic shift

-Whether to set UE-specific values when creating a sequence

<Example 2-5>

The UE and the base station may select a repetition transmission factor according to the type or purpose of a message in which resource allocation is indicated. As an example, the UE may determine which repetition factor to select according to the purpose of a message in which resource allocation is indicated or set. Specifically, the UE and the base station may use different repetition factors in the case of a TDRA for a set grant PUSCH or PDSCH and a TDRA for a dynamic PUSCH or PDSCH.

As another example, the indicated resource allocation message includes an indicator associated with a service type and/or QoS and/or BLER target, or other information capable of distinguishing the service type and/or QoS and/or BLER target is a message When included together, different repetition factors may be applied according to the service type and/or QoS and/or BLER target.

As another example, when the indicated resource allocation message is transmitted through L1 signaling, a repetition transmission factor may be determined according to the type of message (eg, DCI format). Specifically, when a different DCI format is used for each service, different repetition factors may be used according to the DCI format. Alternatively, when a message is delivered by DCI, different repetition factors may be used according to the RNTI used for CRC scrambling of the message.

<Example 2-6>

When the resource length of a given TDRA is a specific length (eg, 2, 4, or 7 symbols) or within a specific threshold range, a repetition transmission factor to be used may be predetermined. Here, the specific threshold may be predetermined or may be determined by L1 signaling or higher layer signaling of the base station.

<Example 2-7>

The given TDRA is repeated according to a combination of starting symbol and transmission duration or a combination of starting symbol, transmission duration and resource mapping type (combination of starting symbol, transmission duration and resource mapping type). The transmission factor can be selected. Here, the transmission period may mean the number of symbols L.

<Example 2-8>

The UE determines whether the start symbol of a given TDRA is between the #0 symbol and the #K1 symbol and/or whether the allocated resource interval (i.e., the number of symbols) is less than or equal to K2 symbols, and uses the repetition factor and which repetition factor You can decide if it is. This can be useful for repeating multiple scheduling within a slot. In this case, K1 and K2 may be determined as L1 signaling or higher layer signaling, respectively, or may be those using a predetermined value. In addition, the K1, K2 and/or repetitive transmission factors to be used may be dependent on each other. Specifically, the value of K1 may be determined according to the value of K2, or the values of K1 and K2 may be determined according to the value of the repetition transmission factor.

It is obvious that the various examples according to Examples 2-1 to 2-8 can determine a characteristic operation related to other resource allocation in determining which of a plurality of repetitive transmission factors will be used. As an example, through Examples 2-1 to 2-8, which TDRA method to be applied by the UE may be determined, or whether to perform reinterpretation of the resource allocation information of the UE may be determined.

3. Selection Criteria for Advanced TDRA Methods

As described above, when a UE or a base station additionally applies other information such as a repetition transmission factor to one resource allocation to perform resource allocation or interpret it, or a given resource allocation is a slot boundary, UL/DL switching point, and reserved resources In the case of including elements that are difficult to use for transmission or reception, the UE and the base station can reinterpret the resource allocation. In this case, the UE may use one or more reinterpretation methods. As an example, the UE and the base station reinterpret a plurality of resource allocations into one resource allocation, or reinterpret one resource allocation into a plurality of resource allocations, or some of the allocated resources or all allocated resources (e.g. , Symbol), or a combination thereof.

This reinterpretation method may be sequentially executing a plurality of reinterpretation methods. That is, a certain reinterpretation method may be a combination of a plurality of reinterpretation methods. For example, the UE first reinterprets a plurality of contiguous resource allocations into one resource allocation without empty space in the time domain, and then the reinterpreted one resource allocation is a slot boundary, a UL/DL switching point. And, in the case of including elements that are difficult to use for transmission or reception such as reserved resources, it may be divided into a plurality of resources and reinterpreted to include only radio resources available for transmission or reception. In this case, a plurality of resources other than the excluded elements may be interpreted as allocated resources.

When the UE can use different reinterpretation methods of one or more resource allocation reinterpretation methods (R1, R2, R3, ..., R_N), when the UE interprets a given resource allocation message, the following example 3- It is possible to determine which resource allocation reinterpretation method to use according to one or a combination of 1 to 3-10, and the base station may transmit a message including resource allocation to the UE by assuming the operation of the UE.

<Example 3-1>

The UE may determine which reinterpretation method to use according to the bit field/parameter included in the resource allocation information transmitted from the base station through L1 signaling or higher layer signaling.

<Example 3-2>

When the UE and the base station perform the TDRA method based on a predefined or configured table, the UE and the base station may determine which reinterpretation method to use according to a specific index or a specific index range of the table.

As an example, when the UE and the base station perform the TDRA method based on a predefined or set table, the UE determines which reinterpretation method to use as part of the data field value used when indicating or setting the index of the table. I can. In addition, the base station can expect such an operation and instruct or set the TDRA to the UE. As an example, the bit size of the TDRA field included in DCI or RRC signaling is composed of ceil (log2 (the number of rows in table)) function + X bits, and some reinterpretation method is used through the MSB or LSB of X bits. Decide.

As another example, a reinterpretation method to be used is determined according to values indicated by bits related to TDRA resource allocation information, and for this purpose, a separate table may be predefined or set to the UE. The separate table may include what reinterpretation method to use according to each SLIV or SLIV range. The following is an example of a separate table that can be predefined or set in relation to the reinterpretation method.

The values included in Table 11 are only examples of the present disclosure, and may be replaced with other values. When a value not included in Table 11 is indicated, any reinterpretation method may be set not to be used, or a specific predefined reinterpretation method may be set to be used.

As another example, when the UE and the base station perform TDRA based on a set or predefined table, a reinterpretation method to be used may be determined based on one column or data field of the corresponding table. The base station can expect this operation and instruct or configure the TDRA to the UE. As an example, when SLIV is set to the UE in the form of a table, an index (or entry) of each table may be indicated or included in addition to SLIV, slot offset and/or DMRS mapping type, as well as one data field. . The UE and the base station can determine which reinterpretation method to use through the data field.

<Example 3-3>

When there is a specific period or interval P for acquiring and/or allocating specific resources, different reinterpretation methods may be used based on the period or interval and X slots/symbols/subframes. Here, as an example of the period or interval, the SPS/grant-free period, the SR/CSI configuration period, and/or the interval between PDCCH opportunities may be included.

As an example, when two reinterpretation methods (R1, R2) exist, R1 may be used when P <X, and R2 may be used in other cases (eg, P >= X). In this case, X may be 1 or another predetermined value.

In addition, when three or more reinterpretation methods can be used, a plurality of X, [X_1, X_2, ... ] Can be used. The plurality of Xs may be used to select one of three or more reinterpretation methods. As an example, when three reinterpretation methods (R1, R2, R3) exist, R1 when 0< P <X_1, R2 when X_1 ≤ P <X_2, and in other cases (e.g., P >= X_2) R3 can be used.

<Example 3-4>

The UE may determine which reinterpretation method to use according to the DMRS symbol position or the factor determining the DMRS symbol position. As an example, the UE may select one reinterpretation method according to the PUSCH/PDSCH DMRS configuration indicated or set by the UE from among a plurality of reinterpretation methods. Here, elements related to the DMRS that may be considered to implement Example 3-4 may be as follows.

-PUSCH/PDSCH mapping type

-Reference position of DMRS symbol positioning: eg, starting point of slot or RA

-DMRS setting type

-Cyclic shift

-Whether to set UE-specific values when creating a sequence

<Example 3-5>

The UE and the base station may determine which reinterpretation method to use according to the type or purpose of the message for which resource allocation is indicated. As an example, the UE may determine which reinterpretation method to use according to the purpose of a message in which resource allocation is indicated or set. Specifically, the UE and the base station may use different reinterpretation methods in the case of a TDRA for a set grant PUSCH or PDSCH and a TDRA for dynamic PUSCH or PDSCH.

As another example, the indicated resource allocation message includes an indicator associated with a service type and/or QoS and/or BLER target, or other information capable of distinguishing the service type and/or QoS and/or BLER target is a message When included together, it may be determined which reinterpretation method to use according to the service type and/or QoS and/or BLER target.

As another example, when the indicated resource allocation message is transmitted through L1 signaling, a reinterpretation method may be determined according to the type of message (eg, DCI format). Specifically, when a different DCI format is used for each service, a reinterpretation method to be used may be determined according to the DCI format. Alternatively, when a message is delivered by DCI, which reinterpretation method to be used may be determined according to the RNTI used for CRC scrambling of the message.

<Example 3-6>

When the resource length of a given TDRA is a specific length (eg, 2, 4, or 7 symbols) or within a specific threshold range, a reinterpretation method to be used may be predetermined. Here, the specific threshold may be predetermined or may be determined by L1 signaling or higher layer signaling of the base station. As an example, when the length of the given or interpreted resource allocation in the time domain is greater than a specific length (eg, 14 symbols), the resource allocation may be divided into a plurality of resource allocations and reinterpreted.

<Example 3-7>

What reinterpretation method to use may be determined according to a combination of a given TDRA and a combination of a start symbol and a transmission period or a combination of a start symbol, a transmission period, and a resource mapping type.

<Example 3-8>

The UE may determine which reinterpretation method to use by determining whether the start symbol of a given TDRA is between the #0 symbol and the #K1 symbol and/or whether the allocated resource interval (ie, the number of symbols) is less than or equal to K2 symbol. This can be useful for repeating multiple scheduling within a slot. In this case, K1 and K2 may be determined as L1 signaling or higher layer signaling, respectively, or may be those using a predetermined value. In addition, the K1, K2 and/or applicable repetition transmission factors and/or reinterpretation methods may be dependent on each other. Specifically, the value of K1 may be determined according to the value of K2. Alternatively, values of K1 and K2 may be determined according to the value of the repetition transmission factor. Alternatively, values of the repetition transmission factor may be determined according to the reinterpretation method, and values of K1 and K2 may be determined accordingly.

<Example 3-9>

The UE may use a specific reinterpretation method when a given resource allocation includes elements that are difficult to use for transmission or reception, such as slot boundaries, UL/DL switching points, and reserved resources. As an example, the UE may be divided into a plurality of resources and reinterpreted so that one analyzed resource includes only radio resources available for transmission.

<Example 3-10>

The UE may use a specific reinterpretation method when a plurality of given resource allocations are continuously repeated without empty space on the time domain within one slot. As an example, a plurality of continuously repeated resource allocations may be reinterpreted as one resource allocation. As another example, the UE connects an even-numbered resource unit among a plurality of resource units (e.g., sub-slots) allocated in one slot to the immediately previous odd-numbered resource unit on the time domain, It can also be used as a unit. Illustratively, in the case where one slot includes 4 subslots composed of 3 symbols in the extended cyclic prefix, the UE connects the 2nd subslot to the 1st subslot and interprets it as one resource unit, and the 4th subslot May be interpreted as one resource unit by connecting to the third subslot. According to Example 3-10, it is possible to reduce the number of repetitive transmissions, thereby reducing DMRS overhead and simplifying the operation of the UE.

It is apparent that various examples according to Examples 3-1 to 3-10 can determine other characteristic operations associated with resource allocation in determining which of the plurality of reinterpretation methods will be used. As an example, through Examples 3-1 to 3-10, it may be determined which TDRA method is to be applied by the UE, or whether to apply a repetitive transmission factor and which repetitive transmission factor to be applied if applied may be determined. have.

14 is a flowchart of a method for transmitting an uplink signal by a user equipment according to an example of the present disclosure.

Referring to FIG. 14, in S1401, the user equipment may receive information on a first start and length indicator value (SLIV) set. Here, the first SLIV set may be a set of SLIVs included in the second allocation table. The information on the first SLIV set may be transmitted to the UE through RRC signaling, and the UE may receive and receive information on the first start and length indicator value (SLIV) set. In addition, each of the plurality of SLIVs included in the first SLIV set may be associated with a start symbol S of an uplink time resource and a number L of symbols counted from the start symbol S.

In addition, the user device may additionally receive and receive information on the second SLIV set. The second SLIV set may be a set of SLIVs included in the first allocation table.

In addition, the information on the first SLIV set may further include information on a start symbol S and the number of symbols L associated with each of a plurality of SLIVs included in the first SLIV set. In addition, if the start symbol S and the number of symbols L associated with each of the plurality of SLIVs included in the second SLIV set are (L-1) <= 7, SLIV = 14 * (L-1) + S is defined based on If, 7 <(L-1) <= 13, it may be defined based on SLIV = 14 * (14-L + 1) + (14-1-S). That is, different TDRA methods may be used depending on whether a specific SLIV received by the UE in S1403 to be described later is included in the first SLIV set or the second SLIV set.

In S1403, the user device may receive SLIV information about a specific SLIV among a plurality of SLIVs included in the first SLIV set. Here, the SLIV information may indicate one of a plurality of SLIVs included in the first SLIV set, not the second SLIV set, based on the setting of the first SLIV set. Alternatively, the SLIV information may indicate one of all SLIVs included in the first SLIV set and the second SLIV set.

In S1405, the user equipment may transmit an uplink signal to the base station on an uplink time resource associated with the specific SLIV based on the received SLIV information. In this case, the first SLIV set may include at least one SLIV for an uplink time resource including a slot boundary. In addition, the second SLIV set may include at least one SLIV for an uplink time resource not including a slot boundary. Exemplarily, at least one of the plurality of SLIVs included in the first SLIV set is associated with an uplink time resource having a length of more than 14 symbols in the time domain, wherein the slot includes 14 symbols, and the second At least one of the plurality of SLIVs included in the SLIV set may be associated with an uplink time resource having a length of 14 symbols or less in the time domain.

15 is a flowchart of a method for receiving an uplink by a base station according to an example of the present disclosure. Hereinafter, detailed descriptions of contents overlapping with those described in FIG. 14 will be omitted.

Referring to FIG. 15, in S1501, the base station may transmit information on the first SLIV set. Here, in addition, the base station may transmit information on the second SLIV set.

In S1503, the base station may transmit SLIV information regarding a specific SLIV among a plurality of SLIVs included in the first SLIV set.

In S1505, the base station may receive the uplink signal on an uplink time resource associated with the specific SLIV based on the received SLIV information. In this case, the first SLIV set may include at least one SLIV for an uplink time resource including a slot boundary.

Meanwhile, the operations according to the various examples of the present disclosure described above may be necessary to support a specific service or specific traffic. Accordingly, when the above-described operations are indicated or set to be used, the type of service or traffic can be inferred through this. That is, it is obvious that examples of the present disclosure can be extended to determine a specific service or a type of specific traffic through whether or not to perform the above-described operations.

Examples of the present disclosure disclosed as described above have been provided to enable any person skilled in the art related to the present disclosure to implement and implement the present disclosure. Although the above has been described with reference to examples of the present disclosure, those skilled in the art may variously modify and change the examples of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Implementations of the present disclosure may be used in a wireless communication system, a base station or user equipment, and other equipment.

Claims (12)

1. In a method for a user device to transmit an uplink signal in a wireless communication system,

   Receive information on a first start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and a symbol counted from the start symbol S Is associated with the number L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1;

   Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

   Transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

   The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

   Uplink signal transmission method.
2. The method of claim 1,

   Receive information about the second SLIV set,

   Based on the setting of the first SLIV set, the SLIV information indicates one of a plurality of SLIVs included in the first SLIV set other than the second SLIV set,

   Uplink signal transmission method.
3. The method of claim 1,

   Receive information about the second SLIV set,

   The SLIV information indicates one of all SLIVs included in the first SLIV set and the second SLIV set,

   Uplink signal transmission method.
4. The method of claim 3,

   The information on the first SLIV set further includes information on S and L associated with each of a plurality of SLIVs included in the first SLIV set,

   Uplink signal transmission method.
5. The method of claim 4,

   S and L associated with each of the plurality of SLIVs included in the second SLIV set are defined based on SLIV = 14 * (L-1) + S if (L-1) <= 7, and 7 <(L- 1) If <= 13, it is defined based on SLIV = 14 * (14-L + 1) + (14-1-S), and SLIV is any one of a plurality of SLIVs included in the second SLIV set, The slot contains 14 symbols,

   Uplink signal transmission method.
6. The method of claim 3,

   At least one of the plurality of SLIVs included in the first SLIV set is associated with an uplink time resource having a length of more than 14 symbols in the time domain, wherein the slot includes 14 symbols,

   At least one of the plurality of SLIVs included in the second SLIV set is associated with an uplink time resource having a length of 14 symbols or less in a time domain,

   Uplink signal transmission method.
7. The method according to claim 2 or 3,

   Information on the first SLIV set and information on the second SLIV set are received through radio resource control (RRC) signaling,

   Uplink signal transmission method.
8. In the device for user equipment in a wireless communication system,

   At least one processor; And

   And at least one memory (memory) operably connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, wherein the operations include:

   Receive information on a first start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and a symbol counted from the start symbol S Is associated with the number L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1;

   Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

   Transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

   The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

   Device.
9. In a user device for transmitting an uplink signal in a wireless communication system,

   At least one transceiver;

   At least one processor; And

   At least one memory (memory) operably connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, the operations:

   Receive information on a first start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and a symbol counted from the start symbol S Is associated with the number L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1;

   Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

   Transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

   The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

   User device.
10. A computer-readable storage medium comprising:

    The computer-readable storage medium stores at least one computer program including at least one or more instructions that when executed by at least one or more processors cause the at least one or more processors to perform operations for a user device, and , The actions are:

    Receive information on a first start and length indicator value (SLIV) set, wherein each of a plurality of SLIVs included in the first SLIV set is a start symbol S of an uplink time resource and a symbol counted from the start symbol S Is associated with the number L, S is an integer greater than or equal to 0 and L is an integer greater than or equal to 1;

    Receiving SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

    Transmitting the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

    The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

    Computer readable storage media.
11. In a method for a base station to receive an uplink signal in a wireless communication system,

    Transmitting information on the first SLIV set, wherein each of the plurality of SLIVs included in the first SLIV set is associated with a start symbol S of an uplink time resource and the number of symbols L counted from the start symbol S, and S Is an integer of 0 or more and L is an integer of 1 or more;

    Transmitting SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

    Receiving the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

    The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

    Uplink signal reception method.
12. In the base station for receiving an uplink signal in a wireless communication system,

    At least one processor; And

    And at least one memory (memory) operatively connected to the at least one or more processors to store at least one or more instructions for causing the at least one or more processors to perform operations, the operations:

    Transmitting information on the first SLIV set, wherein each of the plurality of SLIVs included in the first SLIV set is associated with a start symbol S of an uplink time resource and the number of symbols L counted from the start symbol S, and S Is an integer of 0 or more and L is an integer of 1 or more;

    Transmitting SLIV information for a specific SLIV among a plurality of SLIVs included in the first SLIV set; And

    Receiving the uplink signal on an uplink time resource associated with the specific SLIV based on the SLIV information,

    The first SLIV set includes at least one SLIV for an uplink time resource including a slot boundary,

    Base station.

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