Method and device for reserving resources in nr v2x

Abstract

The present invention relates to a method and a device for reserving resources in NR V2X. Provided is a method for performing wireless communication by a first device and a device supporting the same. The method can include receiving, from a second device, first sidelink control information (SCI) including information related to a resource reservation period on a slot, determining a size of a selection window based on a remaining packet delay budget, obtaining a value of N by applying a ceiling function to a value obtained by dividing the size of the selection window by the resource reservation period, determining to reserve resources on N slots spaced apart by a unit of the resource reservation period after a slot in which the first SCI is received by the second device, and selecting resources for SL communication in the selection window based on the determining, wherein N is a positive integer.

Description

[0001] This application is a divisional application of patent application No. 202180025912.2 (International Application No. PCT / KR2021 / 004572), filed on September 29, 2022, with an international application date of April 12, 2021, entitled "Method and apparatus for reserving resources in NR V2X". Technical Field

[0002] This disclosure relates to wireless communication systems. Background Technology

[0003] Sidelink (SL) communication is a communication scheme that establishes a direct link between user equipment (UE) and allows UEs to directly exchange voice and data without the intervention of evolved Node B (eNB). SL communication is being considered as a solution to the eNB overhead caused by the rapid growth of data traffic. V2X (Vehicle-to-Everything) refers to a communication technology used by vehicles to exchange information with other vehicles, pedestrians, and objects equipped with infrastructure. V2X can be divided into four types: V2V (Vehicle-to-Vehicle), V2I (Vehicle-to-Infrastructure), V2N (Vehicle-to-Network), and V2P (Vehicle-to-Pedestrian). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0004] Furthermore, the increasing demand for larger communication capacity from various communication devices has led to a growing need for enhanced mobile broadband communications compared to traditional radio access technologies (RATs). Consequently, the design of communication systems for UEs or services sensitive to reliability and latency is already under discussion. Next-generation radio access technologies based on enhanced mobile broadband communications, massive machine-type communications (MTC), ultra-reliable low-latency communications (URLLC), etc., can be termed new-generation RATs (radio access technologies) or NRs (new radios). In this paper, NR can also support vehicle-to-everything (V2X) communications.

[0005] Figure 1 This is a diagram used to describe NR-based V2X communication compared to the RAT-based V2X communication previously used. Figure 1 The embodiments can be combined with various embodiments of this disclosure.

[0006] Regarding V2X communication, when discussing the RAT used prior to NR, the focus was on schemes that provided security services based on V2X messages such as BSM (Basic Security Message), CAM (Cooperation Awareness Message), and DENM (Distributed Environment Notification Message). V2X messages can include location information, dynamic information, attribute information, etc. For example, a UE can send periodic message type CAM and / or event-triggered message type DENM to another UE.

[0007] Subsequently, various V2X scenarios were proposed in NR regarding V2X communication. These scenarios could include vehicle platooning, advanced driver assistance, extended sensors, and remote driving. Summary of the Invention

[0008] Technical Purpose

[0009] Meanwhile, according to existing technology, when a transmitting UE receives Side Link Control Information (SCI) from another UE based on a first resource, the transmitting UE can determine that CEILING (100 [ms] / P) resources are selected / reserved by the UE that sent the SCI, and the TX UE can choose not to select CEILING (100 [ms] / P) resources. Here, Y = CEILING (X) can be a function used to derive the smallest integer greater than or equal to X, and P can be the resource reservation period in ms. That is, according to existing technology, the UE can exclude unnecessary resources from the selection within a 100 ms interval. Therefore, it is necessary to propose a resource exclusion operation with high UE efficiency. In addition, it is necessary to define UE operations based on the type of SCI.

[0010] Meanwhile, when multiple resource pools are configured for a UE, the sizes of the SL downlink control information (DCI) associated with each resource pool can be different. In this case, the complexity of the UE may increase when it performs blind decoding of the SL DCI associated with each of the multiple resource pools. Therefore, there is a need to propose a method that does not increase the complexity of the UE due to blind decoding of multiple SL DCIs.

[0011] Technical solution

[0012] In one embodiment, a method for performing wireless communication by a first device is provided. The method may include: receiving first side-link control information (SCI) from a second device in a time slot, including information related to a resource reservation period; determining the size of a selection window based on a remaining packet delay budget; obtaining a value N by applying a CEILING function to a value obtained by dividing the size of the selection window by the resource reservation period; determining that resources will be reserved by the second device in N time slots spaced apart by units of the resource reservation period after the time slot in which the first SCI is received; and selecting resources for SL communication within the selection window based on the determination. N may be a positive integer.

[0013] In one embodiment, a first device configured to perform wireless communication is provided. The first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. The one or more processors may execute instructions to: receive first sidelink control information (SCI) from a second device in a time slot, including information related to a resource reservation period; determine the size of a selection window based on a remaining packet delay budget; obtain a value N by applying a CEILING function to the value obtained by dividing the size of the selection window by the resource reservation period; determine that resources will be reserved by the second device in N time slots spaced apart by units of the resource reservation period after the time slot in which the first SCI is received; and select resources for SL communication within the selection window based on this determination. N may be a positive integer.

[0014] Beneficial effects

[0015] User equipment (UE) can efficiently perform SL communication. Attached Figure Description

[0016] Figure 1 This is a diagram used to describe NR-based V2X communication compared to the RAT-based V2X communication previously used.

[0017] Figure 2 The structure of an NR system according to an embodiment of the present disclosure is shown.

[0018] Figure 3 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0019] Figure 4 The structure of an NR radio frame according to an embodiment of the present disclosure is shown.

[0020] Figure 5 The structure of a time slot for an NR frame according to an embodiment of the present disclosure is shown.

[0021] Figure 6 An example of a BWP according to an embodiment of this disclosure is shown.

[0022] Figure 7 A UE performing V2X or SL communication according to an embodiment of this disclosure is shown.

[0023] Figure 8 The process of a UE performing V2X or SL communication based on a transmission mode according to an embodiment of the present disclosure is illustrated.

[0024] Figure 9 Three broadcast types according to embodiments of this disclosure are shown.

[0025] Figure 10 A resource unit for CBR measurement is shown based on an embodiment of this disclosure.

[0026] Figure 11 A method based on an embodiment of the present disclosure is shown in which a UE that has reserved transmission resources notifies another UE of the transmission resources.

[0027] Figure 12 This illustration shows a process for a UE to select resources within a selection window, based on an embodiment of the present disclosure.

[0028] Figure 13 This invention illustrates a method for a UE to exclude specific resources within a selection window, based on embodiments of the present disclosure.

[0029] Figure 14 The process of a base station performing size alignment for SL DCI is illustrated based on an embodiment of the present disclosure.

[0030] Figure 15 A method for a first device to perform wireless communication is illustrated based on an embodiment of the present disclosure.

[0031] Figure 16 A method for a device to perform wireless communication is illustrated based on embodiments of the present disclosure.

[0032] Figure 17 A method for configuring a base station to perform wireless communication is illustrated based on embodiments of the present disclosure.

[0033] Figure 18 A communication system 1 based on an embodiment of the present disclosure is shown.

[0034] Figure 19 A wireless device based on an embodiment of the present disclosure is shown.

[0035] Figure 20 A signal processing circuit for transmitting signals based on an embodiment of the present disclosure is shown.

[0036] Figure 21 Another example of a wireless device based on an embodiment of this disclosure is shown.

[0037] Figure 22 A handheld device based on an embodiment of the present disclosure is shown.

[0038] Figure 23 Vehicles or autonomous vehicles based on embodiments of this disclosure are shown. Detailed Implementation

[0039] In this disclosure, "A or B" may mean "A only", "B only", or "both A and B". In other words, in this disclosure, "A or B" can be interpreted as "A and / or B". For example, in this disclosure, "A, B or C" may mean "A only", "B only", "C only", or "any combination of A, B, and C".

[0040] The forward slash ( / ) or comma used in this disclosure can mean "and / or". For example, "A / B" can mean "A and / or B". Therefore, "A / B" can mean "A only", "B only", or "both A and B". For example, "A, B, C" can mean "A, B, or C".

[0041] In this disclosure, "at least one of A and B" may mean "only A", "only B" or "both A and B". Furthermore, in this disclosure, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0042] Additionally, in this disclosure, "at least one of A, B, and C" may mean "A only", "B only", "C only" or "any combination of A, B, and C". Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0043] Additionally, the brackets used in this disclosure may mean "for example". Specifically, when indicated as "Control Message (PDCCH)", this may mean that "PDCCH" is cited as an example of "control message". In other words, "control message" in this disclosure is not limited to "PDCCH", and "PDCCH" may be cited as an example of "control message". Specifically, when indicated as "control message (i.e., PDCCH)", this may also mean that "PDCCH" is cited as an example of "control message".

[0044] The technical features described in one of the accompanying drawings in this disclosure can be implemented individually or simultaneously.

[0045] The technologies described below can be used in various wireless communication systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA). CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0046] 5G NR is a successor technology to LTE-A, corresponding to a new type of mobile communication system with high performance, low latency, and high availability. 5G NR can use all available spectrum resources, including low-frequency bands below 1 GHz, mid-frequency bands from 1 GHz to 10 GHz, and high-frequency bands above 24 GHz (millimeter waves).

[0047] For clarity, the following description will focus primarily on LTE-A or 5G NR. However, the technical features of the embodiments according to this disclosure are not limited thereto.

[0048] Figure 2 The structure of an NR system according to an embodiment of this disclosure is shown. Figure 2 The embodiments can be combined with various embodiments of this disclosure.

[0049] Reference Figure 2The Next Generation Radio Access Network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol termination to UE 10. For example, BS 20 may include a Next Generation Node B (gNB) and / or an Evolved Node B (eNB). For example, UE 10 may be fixed or mobile and may be referred to by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), radio equipment, etc. For example, BS may be referred to as a fixed station communicating with UE 10 and may be referred to by other terms such as base transceiver system (BTS), access point (AP), etc.

[0050] Figure 2 The embodiment illustrates a case involving only gNBs. BS 20s can interconnect via the Xn interface. BS 20s can interconnect via the fifth-generation (5G) core network (5GC) and the NG interface. More specifically, BS 20s can connect to the Access and Mobility Management Function (AMF) 30 via the NG-C interface and to the User Plane Function (UPF) 30 via the NG-U interface.

[0051] The radio interface protocol layer between the UE and the network can be classified into Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3) based on the well-known Open Systems Interconnection (OSI) model in communication systems. The Physical (PHY) layer, belonging to Layer 1, provides information transmission services using physical channels, while the Radio Resource Control (RRC) layer, located in Layer 3, controls the radio resources between the UE and the network. For this purpose, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0052] Figure 3 A radio protocol architecture based on an embodiment of this disclosure is shown. Figure 3 The embodiments described herein can be combined with various embodiments of this disclosure. Specifically, Figure 3 (a) shows the radio protocol stack for the user plane used for Uu communication, and Figure 3 (b) shows the radio protocol stack for the control plane used for Uu communication. Figure 3 (c) shows the radio protocol stack for the user plane used for SL communication, and Figure 3 (d) in the diagram shows the radio protocol stack for the control plane used for SL communication.

[0053] Reference Figure 3The physical layer provides information transmission services to the upper layers through physical channels. The physical layer connects to the Media Access Control (MAC) layer, which is the upper layer, via transport channels. Data is transmitted between the MAC layer and the physical layer via transport channels. Transport channels are classified according to how data is transmitted through the radio interface and what characteristics of the data are transmitted.

[0054] Data is transmitted between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver) via a physical channel. The physical channel can be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and the physical channel uses time and frequency as radio resources.

[0055] The MAC layer provides services to the Radio Link Control (RLC) layer, which is a higher layer than the MAC layer, via logical channels. The MAC layer provides the ability to map multiple logical channels to multiple transport channels. The MAC layer also provides logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data delivery services through logical channels.

[0056] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). To ensure the different Quality of Service (QoS) required by the Radio Bearer (RB), the RLC layer provides three types of operating modes: Transparent Mode (TM), Non-Acknowledgment Mode (UM), and Acknowledgment Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0057] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used to control the configuration, reconfiguration, and release of logical, transport, and physical channels associated with RBs. RBs are logical paths for data delivery between the UE and the network, provided by Layer 1 (i.e., the Physical Layer or PHY Layer) and Layer 2 (i.e., the MAC Layer, RLC Layer, Packet Data Convergence Protocol (PDCP) Layer, and Serving Data Adaptation Protocol (SDAP) Layer).

[0058] The Packet Data Convergence Protocol (PDCP) in the user plane performs functions including user data delivery, header compression, and encryption. The Packet Data Convergence Protocol (PDCP) in the control plane performs functions including control plane data delivery and encryption / integrity protection.

[0059] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs the mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and the QoS Flow ID (QFI) tagging in both DL and UL packets.

[0060] The configuration of an Radio Bearer (RB) refers to the processing used to specify the radio protocol layer and channel attributes to provide specific services, as well as to determine the corresponding detailed parameters and operating methods. RBs can then be classified into two types: Signaling Radio Bearers (SRBs) and Data Radio Bearers (DRBs). SRBs are used as paths for transmitting RRC messages in the control plane, while DRBs are used as paths for transmitting user data in the user plane.

[0061] When an RRC connection is established between the UE's RRC layer and the E-UTRAN's RRC layer, the UE is in the RRC connected (RRC_CONNECTED) state; otherwise, the UE can be in the RRC idle (RRC_IDLE) state. In the NR case, an additional RRC inactive (RRC_INACTIVE) state is defined, and a UE in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the BS.

[0062] The downlink transport channels for sending (or transmitting) data from the network to the UE include the Broadcast Channel (BCH) for sending system information and the Shared Downlink Channel (SCH) for sending other user service or control messages. Service or control messages for downlink multicast or broadcast services can be sent via the downlink SCH or via a separate downlink multicast channel (MCH). Furthermore, the uplink transport channels for sending (or transmitting) data from the UE to the network include the Random Access Channel (RACH) for sending initial control messages and the Shared Uplink Channel (SCH) for sending other user service or control messages.

[0063] Examples of logical channels that belong to a higher layer than the transport channel and are mapped to the transport channel may include the Broadcast Control Channel (BCCH), Paging Control Channel (PCCH), Common Control Channel (CCCH), Multicast Control Channel (MCCH), Multicast Service Channel (MTCH), etc.

[0064] Figure 4 The structure of an NR radio frame according to an embodiment of this disclosure is shown. Figure 4 The embodiments can be combined with various embodiments of this disclosure.

[0065] Reference Figure 4 In NR, radio frames can be used to perform uplink and downlink transmissions. A radio frame is 10 ms long and can be defined as consisting of two half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe (SF) can be divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0066] With normal CP, each time slot can include 14 symbols. With extended CP, each time slot can include 12 symbols. In this paper, symbols can include OFDM symbols (or CP-OFDM symbols) and single-carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform Extended OFDM (DFT-s-OFDM) symbols).

[0067] Table 1 below shows the number of symbols (N) per slot based on the SCS configuration (u) under normal CP conditions. slot symb ), Number of time slots per frame (N) frame,u slot ) and the number of time slots per subframe (N) subframe,u slot ).

[0068] [Table 1]

[0069] Table 2 shows examples of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe, based on SCS, when using extended CP.

[0070] [Table 2]

[0071] In an NR system, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) of multiple cells integrated into a UE can be configured differently. Therefore, the (absolute time) duration (or interval) of time resources (e.g., subframes, slots, or TTIs) consisting of the same number of symbols (collectively referred to as time units (TUs) for simplicity) can be configured differently in the integrated cells.

[0072] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15 kHz, a wide range of traditional cellular bands can be supported, while with an SCS of 30 kHz / 60 kHz, dense urban areas, lower latency, and wider carrier bandwidth can be supported. With an SCS of 60 kHz or higher, bandwidths greater than 24.25 GHz can be used to overcome phase noise.

[0073] NR bands can be defined as two different types of frequency ranges. These two different types of frequency ranges can be FR1 and FR2. The values ​​of the frequency ranges can be changed (or varied), for example, the two different types of frequency ranges can be as shown in Table 3 below. In the frequency ranges used in NR systems, FR1 can mean "the range below 6 GHz," and FR2 can mean "the range above 6 GHz," and can also be referred to as millimeter wave (mmW).

[0074] [Table 3]

[0075] As mentioned above, the frequency range values ​​in an NR system can be changed (or varied). For example, as shown in Table 4 below, FR1 can include a bandwidth ranging from 410 MHz to 7125 MHz. More specifically, FR1 can include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 can include unlicensed frequency bands. Unlicensed frequency bands can be used for various purposes; for example, unlicensed frequency bands can be used for vehicle-specific communications (e.g., autonomous driving).

[0076] [Table 4]

[0077] Figure 5 The structure of a time slot for an NR frame according to an embodiment of this disclosure is shown. Figure 5 The embodiments can be combined with various embodiments of this disclosure.

[0078] Reference Figure 5 A time slot comprises multiple symbols in the time domain. For example, in normal CP, a time slot may include 14 symbols. In extended CP, a time slot may include 12 symbols. Alternatively, in normal CP, a time slot may include 7 symbols. However, in extended CP, a time slot may include 6 symbols.

[0079] A carrier comprises multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth portion (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a set of parameters (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via active BWPs. Each element can be referred to as a resource element (RE) in the resource grid, and a complex symbol can be mapped to each element.

[0080] The bandwidth portion (BWP) and carrier will be described in detail below.

[0081] A BWP can be a contiguous set of Physical Resource Blocks (PRBs) within a given set of parameters. A PRB can be a contiguous set of Common Resource Blocks (CRBs) for a given set of parameters on a given carrier.

[0082] For example, a BWP can be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, a UE may not monitor downlink radio link quality in DL BWPs other than the active DL BWP on the primary cell (PCell). For example, a UE may not receive PDCCH, Physical Downlink Shared Channel (PDSCH), or Channel State Information-Reference Signal (CSI-RS) (excluding RRM) other than the active DL BWP. For example, a UE may not trigger Channel State Information (CSI) reports for inactive DL BWPs. For example, a UE may not transmit Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) other than the active UL BWP. For example, in the downlink case, the initial BWP can be given as a continuous set of RBs (remaining minimum system information) control resource sets (CORESET) configured by the Physical Broadcast Channel (PBCH). For example, in the uplink case, the initial BWP can be given by the System Information Block (SIB) for the random access procedure. For example, a default BWP can be configured by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP. To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE can switch its active BWP to the default BWP.

[0083] Furthermore, a BWP can be defined for an SL. The same SL BWP can be used for both transmission and reception. For example, a transmitting UE can transmit an SL channel or SL signal on a specific BWP, and a receiving UE can receive an SL channel or SL signal on a specific BWP. Within a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a UE can receive configuration for an SL BWP from the BS / network. Similarly, a UE can receive configuration for a Uu BWP from the BS / network. For NR V2X UEs outside coverage and RRC_IDLE UEs, the SLBWP is (pre-)configured on the carrier. For UEs in RRC_CONNECTED mode, at least one SL BWP can be activated on the carrier.

[0084] Figure 6An example of a BWP according to an embodiment of this disclosure is shown. Figure 6 The embodiments can be combined with various embodiments of this disclosure. It is assumed that in... Figure 6 In this embodiment, the number of BWPs is 3.

[0085] Reference Figure 6 A Common Resource Block (CRB) can be a carrier resource block numbered from one end of a carrier frequency band to the other. Alternatively, a Producer Resource Block (PRB) can be a resource block numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0086] It can be determined by point A and the offset (N) relative to point A. start BWP ) and bandwidth (N size BWP The BWP can be configured using a parameter set. For example, point A can be an external reference point of the PRB of a carrier, with subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) aligned at point A. For example, the offset can be the PRB distance between the lowest subcarrier in a given parameter set and point A. For example, the bandwidth can be the number of PRBs in a given parameter set.

[0087] The following text will describe V2X or SL communication.

[0088] Sidelink synchronization signals (SLSS) can include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL-specific sequences. The PSSS can be referred to as the primary sidelink synchronization signal (S-PSS), and the SSSS can be referred to as the secondary sidelink synchronization signal (S-SSS). For example, a 127-character M-sequence can be used for the S-PSS, and a 127-character Gold sequence can be used for the S-SSS. For example, a UE can use the S-PSS for initial signal detection and synchronization acquisition. For example, a UE can use both the S-PSS and S-SSS for detailed synchronization acquisition and for detecting the synchronization signal ID.

[0089] The Physical Sidelink Broadcast Channel (PSBCH) can be a (broadcast) channel used to transmit default (system) information that the UE must know before SL signal transmission / reception. For example, the default information could be related to SLSS, duplex mode (DM), Time Division Duplex (TDD) uplink / downlink (UL / DL) configuration, resource pool information, and application types related to SLSS, subframe offset, and broadcast information. For instance, to evaluate PSBCH performance in NR V2X, the PSBCH payload size can be 56 bits, including 24 bits of Cyclic Redundancy Check (CRC).

[0090] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP lengths) as the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) in the carrier, and the transmission bandwidth can exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. Additionally, the frequency location of the S-SSB can be (pre-)configured. Therefore, the UE does not need to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0091] Figure 7 A UE performing V2X or SL communication according to an embodiment of this disclosure is shown. Figure 7 The embodiments can be combined with various embodiments of this disclosure.

[0092] Reference Figure 7 In V2X or SL communication, the term "UE" can generally refer to a user's UE. However, if a network device such as a BS transmits / receives signals according to a communication scheme between UEs, then the BS can also be considered a UE. For example, UE 1 can be a first device 100, and UE 2 can be a second device 200.

[0093] For example, UE 1 can select a resource element corresponding to a specific resource from a resource pool that represents a set of resource families. Additionally, UE 1 can transmit SL signals using resource elements. For instance, the resource pool in which UE 1 can transmit signals can be configured for UE 2, acting as a receiving UE, and UE 1's signals can be detected within that resource pool.

[0094] In this document, if UE 1 is within the connection range of the BS, the BS can inform UE 1 of the resource pool. Otherwise, if UE 1 is outside the connection range of the BS, another UE can inform UE 1 of the resource pool, or UE 1 can use a pre-configured resource pool.

[0095] Typically, resource pools can be configured in units of multiple resources, and each UE can select one or more units of resources to use in its SL signal transmission.

[0096] The following section describes resource allocation in SL.

[0097] Figure 8 The process of a UE performing V2X or SL communication based on a transmission mode according to an embodiment of this disclosure is illustrated. Figure 8The embodiments described herein can be combined with various embodiments of this disclosure. In various embodiments of this disclosure, the transmission mode may be referred to as a mode or resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0098] For example, Figure 8 (a) illustrates UE operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) illustrates UE operations associated with NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to regular SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0099] For example, Figure 8 (b) illustrates UE operation associated with LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) shows the UE operation associated with NR resource allocation mode 2.

[0100] Reference Figure 8 In (a) of this clause, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS can schedule SL resources for the UE to use for SL transmission. For example, the BS can perform resource scheduling for UE 1 via PDCCH (e.g., Downlink Control Information (DCI)) or RRC signaling (e.g., Configuration License Type 1 or Configuration License Type 2), and UE 1 can perform V2X or SL communication against UE 2 based on the resource scheduling. For example, UE 1 can send Sidelink Control Information (SCI) to UE 2 via the Physical Sidelink Control Channel (PSCCH), and subsequently send SCI-based data to UE 2 via the Physical Sidelink Shared Channel (PSSCH).

[0101] Reference Figure 8In (b) of this document, under LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the BS / network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources from the configured resource pool. For example, the UE can autonomously select resources within a selection window by performing a sensing and resource (re)selection process. For example, sensing can be performed on a sub-channel basis. Furthermore, UE 1, which has autonomously selected resources from the resource pool, can send SCI to UE 2 via PSCCH, and subsequently send SCI-based data to UE 2 via PSSCH.

[0102] Figure 9 Three broadcast types according to embodiments of this disclosure are shown. Figure 9 The embodiments can be combined with various embodiments of this disclosure. Specifically, Figure 9 (a) shows broadcast SL communication. Figure 9 (b) shows unicast SL communication, and Figure 9 (c) illustrates multicast SL communication. In the case of unicast SL communication, a UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, a UE can perform SL communication with one or more UEs in a group to which it belongs. In various embodiments of this disclosure, SL multicast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0103] The following section will describe side link (SL) congestion control.

[0104] If the UE autonomously determines the SL transmission resources, it also autonomously determines the size and frequency of the resources available for its use. Of course, due to constraints from the network and other factors, the size or frequency of resources used can be limited to a certain level. However, if many UEs are concentrated in a specific area at a specific time and all UEs use a relatively large amount of resources, overall performance will be significantly degraded due to mutual interference.

[0105] Therefore, the UE may need to observe channel conditions. If it is determined that excessive resources are being consumed, it is preferable for the UE to autonomously reduce resource usage. In this disclosure, this can be defined as congestion control (CR). For example, the UE can determine whether the energy measured per unit time / frequency resource is greater than or equal to a certain level, and can adjust the amount of resources used for its transmission and the frequency of use based on the ratio of unit time / frequency resources where energy greater than or equal to the specific level is observed. In this disclosure, the ratio of time / frequency resources where energy greater than or equal to the specific level is observed can be defined as the channel busy rate (CBR). The UE can measure the channel / frequency CBR. Additionally, the UE can send the measured CBR to the network / BS.

[0106] Figure 10 A resource unit for CBR measurement based on an embodiment of this disclosure is shown. Figure 10 The embodiments can be combined with various embodiments of this disclosure.

[0107] Reference Figure 10 As a result of the UE measuring RSSI based on subchannels within a specific time period (e.g., 100 ms), the CBR can represent the number of subchannels whose received Signal Strength Indicator (RSSI) measurement values ​​are greater than or equal to a pre-configured threshold. Alternatively, the CBR can represent the ratio of subchannels with values ​​greater than or equal to the pre-configured threshold within a specific duration. For example, in Figure 10 In this embodiment, if it is assumed that the shaded sub-channel is a sub-channel with a value greater than or equal to a pre-configured threshold, then CBR can represent the ratio of shaded sub-channels within a 100 ms time period. Additionally, CBR can be reported to BS.

[0108] Furthermore, congestion control considering the priority of services (e.g., packets) may be necessary. For this purpose, the UE can, for example, measure the channel occupancy ratio (CR). Specifically, the UE can measure the CR, and based on the CR, the UE can determine the maximum value CRlimitk of the channel occupancy rate k (CRk) that can be occupied by traffic corresponding to each priority (e.g., k). For example, the UE can derive the maximum value CRlimitk of the channel occupancy rate related to the priority of each traffic based on a predetermined table of CR measurements. For example, in the case of traffic with relatively high priority, the UE can derive a relatively large maximum value of channel occupancy rate. Subsequently, the UE can perform congestion control by limiting the sum of the channel occupancy rates of traffic with priority k below i to a value less than or equal to a specific value. Based on this method, channel occupancy rates can be more strictly limited for traffic with relatively low priority.

[0109] In addition, the UE can perform SL congestion control by adjusting the transmit power level, dropping packets, determining whether to perform retransmission, and adjusting the transmit RB size (MCS coordination).

[0110] The Hybrid Automatic Repeat Request (HARQ) process will be described below.

[0111] In both SL unicast and multicast scenarios, HARQ feedback and HARQ combination in the physical layer can be supported. For example, when the receiving UE is operating in resource allocation mode 1 or 2, the receiving UE can receive PSSCH from the sending UE, and the receiving UE can send HARQ feedback corresponding to the PSSCH to the sending UE using the sidelink feedback control information (SFCI) format via the physical sidelink feedback channel (PSFCH).

[0112] For example, SL HARQ feedback can be enabled for unicast. In this case, during non-block group (non-CBG) operation, the receiving UE can decode the PSCCH targeted at the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE can generate a HARQ-ACK. The receiving UE can then send the HARQ-ACK to the sending UE. Conversely, if the receiving UE fails to successfully decode the transport block associated with the PSCCH after decoding the PSCCH targeted at the receiving UE, the receiving UE can generate a HARQ-NACK, and the receiving UE can send the HARQ-NACK to the sending UE.

[0113] For example, SL HARQ feedback can be enabled for multicast. For example, during non-CBG periods, two different types of HARQ feedback options can be supported for multicast.

[0114] (1) Multicast Option 1: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the sending UE via the PSFCH. Conversely, when the receiving UE decodes the PSCCH targeted at the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE will not send a HARQ-ACK to the sending UE.

[0115] (2) Multicast Option 2: After decoding the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the sending UE via the PSFCH. Furthermore, when the receiving UE decodes the PSCCH targeted at the receiving UE, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK to the sending UE via the PSFCH.

[0116] For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication can share PSFCH resources. For instance, UEs belonging to the same group can send HARQ feedback using the same PSFCH resources.

[0117] For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication can use different PSFCH resources for HARQ feedback transmission. For instance, UEs belonging to the same group can send HARQ feedback using different PSFCH resources.

[0118] For example, when SL HARQ feedback is enabled for multicast, the receiving UE can determine whether to send HARQ feedback to the transmitting UE based on the transmit-receive (TX-RX) distance and / or the reference signal received power (RSRP).

[0119] For example, in multicast option 1, in the case of HARQ feedback based on TX-RX distance, if the TX-RX distance is less than or equal to the communication range requirement, the receiving UE may send the HARQ feedback in response to the PSSCH to the sending UE. Otherwise, if the TX-RX distance is greater than the communication range requirement, the receiving UE may not send the HARQ feedback in response to the PSSCH to the sending UE. For example, the sending UE may inform the receiving UE of its location via the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the locations of the receiving UE and the sending UE. For example, the receiving UE may decode the SCI associated with the PSSCH, thus knowing the communication range requirement for the PSSCH.

[0120] For example, in resource allocation mode 1, the time (offset) between PSFCH and PSSCH can be configured or pre-configured. In unicast and multicast scenarios, if a retransmission is required on the SL, it can be indicated to the BS by a UE within the coverage area using PUCCH. The sending UE can send the indication to the serving BS in the form of a Scheduling Request (SR) / Buffer Status Report (BSR) instead of HARQACK / NACK. Furthermore, even if the BS does not receive this indication, it can still schedule SL retransmission resources for the UE. For example, in resource allocation mode 2, the time (offset) between PSFCH and PSSCH can be configured or pre-configured.

[0121] For example, from the perspective of UE transmission in a carrier, TDM between PSCCH / PSSCH and PSFCH can be allowed for the PSFCH format used for SL in a time slot. For example, a sequence-based PSFCH format with a single symbol can be supported. In this document, this single symbol may not be an AGC duration. For example, the sequence-based PSFCH format can be applied to both unicast and multicast.

[0122] For example, within a time slot associated with a resource pool, the PSFCH resource can be periodically configured for N time slot durations, or it can be pre-configured. For example, N can be configured to one or more values ​​greater than or equal to 1. For example, N can be 1, 2, or 4. For example, HARQ feedback for transmissions within a specific resource pool can be sent via PSFCH only on that specific resource pool.

[0123] For example, if a sending UE sends a PSSCH to a receiving UE across time slots #x to #n, the receiving UE can send a HARQ feedback in response to the PSSCH to the sending UE in time slot #(N+A). For example, time slot #(N+A) may include PSFCH resources. In this document, for example, A may be the smallest integer greater than or equal to K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in the resource pool. Alternatively, for example, K may be the number of physical time slots. In this case, K may be the number of time slots inside or outside the resource pool.

[0124] For example, if the receiving UE sends a HARQ feedback on a PSFCH resource in response to a PSSCH sent to the receiving UE by the sending UE, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on implicit mechanisms in the configured resource pool. For example, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on at least one of the slot index associated with the PSCCH / PSSCH / PSFCH, the sub-channel associated with the PSCCH / PSSCH, or the identifier of each receiving UE in the group used to identify HARQ feedback based on multicast option 2. Alternatively / in addition, for example, the receiving UE can determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SL RSRP, SINR, L1 source ID, and / or location information.

[0125] For example, if HARQ feedback transmission via the UE's PSFCH overlaps with HARQ feedback reception via the PSFCH, the UE can select either HARQ feedback transmission via the PSFCH or HARQ feedback reception via the PSFCH based on priority rules. For example, the priority rules can be based at least on the priority indication of the relevant PSCCH / PSSCH.

[0126] For example, if HARQ feedback transmissions via PSFCH overlap for multiple UEs, the UE can select a specific HARQ feedback transmission based on priority rules. For instance, the priority rules could be based on the lowest priority indication of the relevant PSCCH / PSSCH.

[0127] In this disclosure, the transmitting UE (i.e., TX UE) can be a UE that transmits data to the (target) receiving UE (i.e., RX UE). For example, the TX UE can be a UE that performs PSCCH transmission and / or PSSCH transmission. For example, the TX UE can be a UE that transmits SL CSI-RS and / or SL CSI report request indicators to the (target) RX UE. For example, the TX UE can be a UE that transmits (predefined) reference signals (e.g., PSSCH demodulation reference signals (DM-RS)) and / or SL (L1) RSRP report request indicators to the (target) RX UE for SL (L1) RSRP measurement. For example, the TX UE can be a UE that transmits reference signals (e.g., PSCCH, PSSCH, etc.) on (control) channels (e.g., DM-RS, CSI-RS) for SL radio link monitoring (RLM) operation and / or SL radio link failure (RLF) operation of the (target) RX UE.

[0128] In this disclosure, the receiving UE (i.e., the RX UE) can be a UE that sends SL HARQ feedback to the sending UE (i.e., the TX UE) based on whether the decoding of data received from the TX UE was successful and / or whether the detection / decoding of the PSCCH (related to PSSCH scheduling) sent by the TX UE was successful. For example, the RX UE can be a UE that performs SL CSI transmission to the TX UE based on SL CSI-RS and / or SL CSI report request indicator received from the TX UE. For example, the RX UE can be a UE that sends SL (L1) RSRP measurements to the TX UE based on (predefined) reference signals and / or SL (L1) RSRP report request indicator received from the TX UE. For example, the RX UE can be a UE that sends data of the RX UE to the TX UE. For example, the RX UE can be a UE that performs SL RLM and / or SL RLF operations based on reference signals on the (preconfigured) (control) channel and / or (control) channel received from the TX UE.

[0129] Furthermore, in this disclosure, the TX UE can send all or part of the following information to the RX UE via the SCI. For example, the TX UE can send all or part of the following information to the RX UE via a first SCI and / or a second SCI.

[0130] - PSSCH (and / or PSCCH) related resource allocation information (e.g., location / quantity of time / frequency resources, resource reservation information (e.g., period)).

[0131] - SL CSI report request indicator or SL(L1)RSRP (and / or SL(L1)RSRQ and / or SL(L1)RSSI) report request indicator

[0132] - SL CSI Send Indicator (or SL(L1)RSRP (and / or SL(L1)RSRQ and / or SL(L1)RSSI) Message Send Indicator) (on PSSCH)

[0133] - Modulation and coding scheme (MCS) information

[0134] - Transmit power information

[0135] - L1 Destination ID information and / or L1 Source ID information

[0136] - SL HARQ process ID information

[0137] - New Data Indicator (NDI) Information

[0138] - Redundant Version (RV) Information

[0139] - QoS information (e.g., priority information) related to the transmission of services / packets

[0140] - Information about the number of antenna ports used for (transmitting) SL CSI-RS or the SL CSI-RS transmit indicator.

[0141] - (Requesting) the location (or distance range) information of the target RX UE or the location information of the TX UE in response to its SL HARQ feedback.

[0142] - Reference signal (e.g., DM-RS, etc.) information related to the decoding and / or channel estimation of data to be transmitted via PSSCH. For example, reference signal information may be information related to the pattern of the (time-frequency) mapping resources of DM-RS, rank information, antenna port index information, information about the number of antenna ports, etc.

[0143] Furthermore, in this disclosure, for example, PSCCH can be replaced / substituted with at least one of SCI, first SCI (first-level SCI), and / or second SCI (second-level SCI), or vice versa. For example, SCI can be replaced / substituted with at least one of PSCCH, first SCI, and / or second SCI, or vice versa. For example, PSSCH can be replaced / substituted with second SCI and / or PSCCH, or vice versa.

[0144] Furthermore, in this disclosure, for example, if the SCI configuration fields are divided into two groups considering the (relatively) high SCI payload size, the SCI including the first SCI configuration field group can be referred to as the first SCI or first-level SCI, and the SCI including the second SCI configuration field group can be referred to as the second SCI or second-level SCI. For example, the first SCI and the second SCI can be transmitted through different channels. For example, the transmitting UE can transmit the first SCI to the receiving UE via PSCCH. For example, the second SCI can be transmitted to the receiving UE via (independent) PSCCH, or it can be transmitted via PSSCH along with data in a payload manner.

[0145] Furthermore, in this disclosure, for example, "configured / configured" or "defined / defined" can refer to (pre)configuration from a base station or network. For example, "configured / configured" or "defined / defined" can refer to (pre)configuration from a base station or network for each resource pool. For example, the base station or network can send information related to "configuration" or "definition" to the UE. For example, the base station or network can send information related to "configuration" or "definition" to the UE via predefined signaling. For example, predefined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0146] Furthermore, in this disclosure, for example, "configured / configured" or "defined / defined" can refer to specifying or configuring via pre-configuration signaling between UEs. For example, information related to "configuration" or "definition" can be sent or received between UEs via pre-configuration signaling. For example, pre-defined signaling may include at least one of RRC signaling, MAC signaling, PHY signaling, and / or SIB.

[0147] At the same time, in this disclosure, for example, RLF can be replaced / replaced by asynchronous (OOS) and / or synchronous (IS), or vice versa.

[0148] Furthermore, in this disclosure, for example, a resource block (RB) can be replaced / alternate with a subcarrier, or vice versa. For example, packets or services can be replaced / alternate with a transport block (TB) or a media access control protocol data unit (MAC PDU) according to the transport layer, or vice versa. For example, a code block group (CBG) can be replaced / alternate with a TB, or vice versa. For example, a source ID can be replaced / alternate with a destination ID, or vice versa. For example, an L1 ID can be replaced / alternate with an L2 ID, or vice versa. For example, an L1 ID can be an L1 source ID or an L1 destination ID. For example, an L2 ID can be an L2 source ID or an L2 destination ID.

[0149] Additionally, in this disclosure, for example, the operation of reserving / selecting / determining retransmission resources by the TX UE may include the operation of the TX UE reserving / selecting / determining a potential retransmission resource for actual use based on SL HARQ feedback information received from the RX UE.

[0150] Furthermore, in this disclosure, a sub-selection window can be replaced / replaced by a selection window and / or a pre-configured set of resources within the selection window, or vice versa.

[0151] In this disclosure, SL mode 1 can refer to a resource allocation method or communication method in which the base station directly schedules SL transmission resources for the TX UE through predefined signaling (e.g., DCI or RRC messages). For example, SL mode 2 can refer to a resource allocation method or communication method in which the UE independently selects SL transmission resources from a resource pool pre-configured or configured by the base station or network. For example, a UE performing SL communication based on SL mode 1 can be referred to as a mode 1 UE or a mode 1 TX UE, while a UE performing SL communication based on SL mode 2 can be referred to as a mode 2 UE or a mode 2 TX UE.

[0152] Furthermore, in this disclosure, for example, a Dynamic Grant (DG) can be replaced / replaced with a Configuration Grant (CG) and / or a Semi-Persistent Scheduling (SPS) grant, or vice versa. For example, a DG can be replaced / replaced with a combination of CG and SPS grants, or vice versa. For example, a CG can include at least one of Configuration Grant (CG) Type 1 and / or Configuration Grant (CG) Type 2. For example, in CG Type 1, the grant can be provided via RRC signaling and can be stored as a configuration grant. For example, in CG Type 2, the grant can be provided via PDCCH and can be stored or deleted as a configuration grant based on L1 signaling indicating activation or deactivation of the grant. For example, in CG Type 1, the base station can allocate periodic resources to the TX UE via RRC messages. For example, in CG Type 2, the base station can allocate periodic resources to the TX UE via RRC messages, and the base station can dynamically activate or deactivate the periodic resources via DCI.

[0153] Furthermore, in this disclosure, a channel can be replaced / substituted with a signal, or vice versa. For example, transmitting / receiving a channel may include transmitting / receiving a signal. For example, transmitting / receiving a signal may include transmitting / receiving a channel. For example, broadcasting can be replaced / substituted with at least one of unicast, multicast, and / or broadcast, or vice versa. For example, broadcasting type can be replaced / substituted with at least one of unicast, multicast, and / or broadcast, or vice versa. For example, broadcasting or broadcasting type may include unicast, multicast, and / or broadcast.

[0154] Furthermore, in this disclosure, resources can be replaced / substituted with time slots or symbols, or vice versa. For example, resources may include time slots and / or symbols.

[0155] Furthermore, in this disclosure, priority can be replaced by at least one of Logical Channel Prioritization (LCP), delay, reliability, minimum required communication range, ProSe per Packet Priority (PPPP), Side Link Radio Bearer (SLRB), QoS profile, QoS parameters and / or requirements, or vice versa.

[0156] Meanwhile, in this disclosure, for example, for the sake of description, the (physical) channel used when the RX UE sends at least one of the following information to the TX UE may be referred to as PSFCH.

[0157] - SL HARQ feedback, SL CSI, SL (L1) RSRP

[0158] Furthermore, in this disclosure, the Uu channel may include a UL channel and / or a DL channel. For example, the UL channel may include PUSCH, PUCCH, sounding reference signal (SRS), etc. For example, the DL channel may include PDCCH, PDSCH, PSS / SSS, etc. For example, the SL channel may include PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.

[0159] Furthermore, in this disclosure, sidelink information may include at least one of sidelink messages, sidelink packets, sidelink services, sidelink data, sidelink control information, and / or sidelink transport blocks (TBs). For example, sidelink information may be sent via PSSCH and / or PSCCH.

[0160] In this disclosure, "high priority" can refer to a low priority value, while "low priority" can refer to a high priority value. For example, Table 5 shows examples of priorities.

[0161] [Table 5]

[0162] Referring to Table 5, for example, service A or logical channel A associated with the lowest priority value can have the highest priority. For example, service C or logical channel C associated with the highest priority value can have the lowest priority.

[0163] Furthermore, in NR V2X communication or NR sidelink communication, the transmitting UE can reserve / select one or more transmission resources for sidelink transmission (e.g., initial transmission and / or retransmission), and the transmitting UE can send information about the location of one or more transmission resources to the receiving UE.

[0164] Furthermore, when performing sidelink communication, the method for reserving or pre-determining transmission resources for the receiving UE during transmission can be represented as follows.

[0165] For example, the transmitting UE can perform transmission resource reservation based on chains. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can send location information of fewer than K transmission resources to the receiving UE by sending an SCI to the receiving UE at any (or specific) transmission time or time resource. That is, for example, the SCI can include location information of fewer than K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE can send location information of fewer than K transmission resources to the receiving UE by sending an SCI to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include location information of fewer than K transmission resources. In this case, for example, by signaling the location information of fewer than K transmission resources to the receiving UE via only one SCI sent by the transmitting UE at any (or specific) transmission time or time resource, performance degradation due to excessive increase in the SCI payload can be prevented.

[0166] Figure 11 A method is shown in which a UE having reserved transmission resources notifies another UE of transmission resources based on an embodiment of the present disclosure. Figure 11 The embodiments can be combined with various embodiments of this disclosure.

[0167] Specifically, for example, Figure 11 (a) illustrates a chain-based resource reservation method performed by the transmitting UE when the value K=4, by sending / signaling the location information of a maximum of two transmission resources to the receiving UE via an SCI. For example, Figure 11 (b) illustrates a method for chain-based resource reservation by the transmitting UE when the value K=4, by sending / signaling the location information of a maximum of 3 transmission resources to the receiving UE via an SCI. For example, refer to Figure 11 In (a) and (b), the transmitting UE can send / signal the location information of the fourth transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH. For example, refer to Figure 11 (a) The transmitting UE can send / signal to the receiving UE not only the location information of the fourth transmission-related resources via the fourth (or last) transmission-related PSCCH, but also separately send / signal the location information of the third transmission-related resources. For example, refer to Figure 11 (b) The transmitting UE can send / signal to the receiving UE not only the location information of the fourth transmission-related resource via the fourth (or last) transmission-related PSCCH, but also separately send / signal the location information of the second and third transmission-related resources. In this case, for example, in Figure 11In (a) and (b), if the transmitting UE can only send / signal the location information of the fourth transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH, then the transmitting UE can set or specify the field / bit of the location information of unused or remaining transmission resources to a pre-configured value (e.g., 0). For example, in Figure 11 In (a) and (b), if the transmitting UE can send / signal the location information of the fourth transmission-related resources to the receiving UE via the fourth (or last) transmission-related PSCCH, the transmitting UE can set or specify the field / bit of the location information of the unused or remaining transmission resources as a pre-configured status / bit value indicating / representing the last transmission (in the 4 transmissions).

[0168] Furthermore, for example, the transmitting UE can perform the reservation of transmission resources on a block-by-block basis. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE can send the location information of the K transmission resources to the receiving UE via an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include the location information of the K transmission resources. For example, if the transmitting UE reserves K transmission resources associated with a specific TB, the transmitting UE can send the location information of the K transmission resources to the receiving UE via an SCI sent to the receiving UE at any (or specific) transmission time or time resource. That is, the SCI can include the location information of the K transmission resources. For example, Figure 11 (c) illustrates a block-based resource reservation method performed by the sending UE when the value K=4, by signaling the location information of the four transmission resources to the receiving UE via an SCI.

[0169] Based on embodiments of this disclosure, the base station / network can configure or pre-configure the UE such that a portion of the following parameters are maintained identically across multiple (reserved) transmission resources associated with a specific TB. For example, the UE can maintain / configure a portion of the following parameters identically across multiple (reserved) transmission resources associated with a specific TB. For example, the base station / network can configure or pre-configure the UE such that a portion of the following parameters are maintained identically across transmission resources scheduled / reserved via (one) SCI. For example, the UE can maintain / configure a portion of the following parameters identically across transmission resources scheduled / reserved via (one) SCI. For example, the parameters may include at least one of the following: (i) MCS value, (ii) RV value, (iii) NDI value, and / or (iv) the number of REs associated with the mapping of the second SCI and / or parameters used to determine the (effective) coding rate (e.g., beta offset).

[0170] Here, for example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the resource pool. For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the service type. For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the service priority. For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on QoS requirements (e.g., latency, reliability). For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the broadcast type (e.g., unicast, multicast, broadcast). For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on HARQ feedback options (e.g., NACK-only feedback (based on TX-RX distance), ACK / NACK feedback). For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on whether TB is enabled or disabled in HARQ (feedback). For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the (resource pool-related) congestion level. For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on a periodic resource reservation method (based on backpropagation) or a chain-based resource reservation method (without backpropagation). For example, the application or enabling of corresponding rules can be configured differently (or restrictively) for the UE based on the maximum number of transmission resources that can be signaled via (pre-configured) SCI (e.g., 2).

[0171] For example, when the above rules are applied, an RX UE can be configured to perform HARQ combinations of PSSCH on the relevant scheduling / reservation resources or data. Specifically, for example, when the above rules apply, even if an RX UE that succeeds in decoding an SCI fails (partially) in decoding each associated (additional) SCI, it can still be configured to enable HARQ combinations of PSSCH on the scheduling / reservation resources associated with the SCI or data.

[0172] For example, when the size of the frequency resources of a specific sub-channel constituting the resource pool is greater than or less than the size of the frequency resources of other sub-channels, it can be exceptionally configured so that the rules proposed above are not applied. For ease of explanation, when the size of the frequency resources of a specific sub-channel constituting the resource pool is greater than or less than the size of the frequency resources of other sub-channels, this sub-channel can be referred to as UNNOR_SB. For example, when UNNOR_SB is included in multiple (reserved) transmission resources associated with a specific TB, it can be exceptionally configured so that the rules proposed above are not applied. For example, when UNNOR_SB is included in transmission resources scheduled / reserved through (one) SCI, it can be exceptionally configured so that the rules proposed above are not applied. In this way, for example, even if UNNOR_SB is included in multiple (reserved) transmission resources associated with a specific TB, the UE can maintain the same TB size. In addition, for example, even if UNNOR_SB is included in transmission resources scheduled / reserved through (one) SCI, the UE can maintain the same TB size.

[0173] For example, between specific TB-related (reserved) transmission resources where chain-based signaling stops, it can be configured to not apply the rules proposed above. For example, between (re)transmission resources after a HARQ feedback (e.g., NACK) (via PSFCH) and (re)transmission resources before a HARQ feedback, it can be configured to not apply the rules proposed above. For example, between (re)transmission resources after a DTX (e.g., the RX UE did not perform PSFCH transmission due to PSCCH decoding failure) and (re)transmission resources before a DTX, it can be configured to not apply the rules proposed above.

[0174] Based on embodiments of this disclosure, the parameter set associated with a bitmap used for a resource pool (e.g., a bitmap applied to a resource pool) and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set associated with the TDD configuration on the PSBCH. For example, the parameter set associated with a bitmap used for a resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set associated with the signaling of the number of UL slots on the PSBCH. For example, the parameter set associated with a bitmap used for a resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set for UL (associated with Uu communication). For example, the parameter set associated with a bitmap used for a resource pool and / or the granularity of the bitmap application for the resource pool can be configured to be the same as the (reference) parameter set for DL ​​(associated with Uu communication). For example, the parameter set may include subcarrier spacing, CP length, CP type, etc.

[0175] For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set related to the TDD configuration on the PSBCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set related to the signaling of the number of UL slots on the PSBCH. For example, the parameter set related to the bitmap for the resource pool and / or the granularity of the bitmap application for the resource pool can be configured differently from the (reference) parameter set related to UL (related to Uu communication). For example, the parameter set can include subcarrier spacing, CP length, CP type, etc.

[0176] Based on embodiments of this disclosure, when the number of RBs included in a sub-channel is configured to be equal to the number of PSCCH RBs, the base station / network may not configure the UE with a pattern and / or a number of problematic PSSCH DMRSs in the mapping of the second SCI (resource pool specific). For example, when the number of RBs included in a sub-channel is configured to be equal to the number of PSCCH RBs, the UE may anticipate / determine that the base station / network will not configure the UE with a pattern and / or a number of problematic PSSCH DMRSs in the mapping of the second SCI (resource pool specific). For example, the pattern and / or number of PSSCH DMRSs may be time-domain related parameters to the DMRS mapped on the PSSCH resources. For example, when the number of RBs included in a subchannel is configured to be equal to the number of PSCCH RBs, even if the base station / network configures (resource pool specific) candidate patterns and / or candidate numbers of PSSCH DMRSs that are problematic in the mapping of the second SCI to the UE, the UE may not select / use the candidate patterns and / or candidate numbers of PSSCH DMRSs that are problematic in the mapping of the second SCI. Here, for example, the UE may be configured to map the second SCI in a frequency-first and time-second manner, starting from the first DMRS symbol associated with the PSSCH (hereinafter, FRT_DMSYM) (e.g., including REs other than DMRS REs). For example, after sequentially mapping the second SCI to #(FRT_DMSYM), the UE may map the second SCI to #(FRT_DMSYM + 1). Thereafter, based on the same rule, the UE may map the second SCI to #(FRT_DMSYM + N). Here, N can be a positive integer.

[0177] For example, when a UE performs mapping of a second SCI based on the pattern and / or number of PSSCH DMRS, if FRT_DMSYM is truncated (fully or partially) by PSCCH RB, the PSSCH DMRS pattern and / or number of PSSCH DMRS can be identified / considered as problematic PSSCH DMRS patterns and / or numbers of PSSCH DMRS in the mapping of the second SCI. Similarly, when a UE performs mapping of a second SCI based on the pattern and / or number of PSSCH DMRS, if an untruncated (fully or partially) (earliest in the time domain) PSSCH DMRS exists after a pre-configured threshold position within the PSSCH duration, the PSSCH DMRS pattern and / or number of PSSCH DMRS can be identified / considered as problematic PSSCH DMRS patterns and / or numbers of PSSCH DMRS in the mapping of the second SCI. For example, when the UE performs mapping of the second SCI based on the pattern and / or number of PSSCH DMRS, if the number of PSSCH DMRS used for decoding (or remaining) the second SCI is less than a pre-configured threshold, the PSSCH DMRS pattern and / or number of PSSCH DMRS can be determined / considered as the number of problematic PSSCH DMRS patterns and / or PSSCH DMRS in the mapping of the second SCI.

[0178] For example, the proposed rules can only be applied (restrictively) when TB transmission is performed through a subchannel. Here, for example, in this case, the UE can be configured to map the second SCI in the opposite direction starting from the last symbol associated with the PSSCH. For example, in this case, the UE can be configured to map the second SCI in the opposite direction starting from the last symbol associated with the PSSCH in the form of frequency first and time second. For example, the last symbol can be the last DMRS symbol or the last data symbol.

[0179] Based on embodiments of this disclosure, when a TX UE uses resources on both PSFCH slots (e.g., slots including PSFCH resources) and NON-PSFCH slots (e.g., slots excluding PSFCH resources), if the TX UE cannot maintain the same (PSSCH) TB size between the initial transmission and retransmission, the TX UE can be configured to perform transmission resource selection / reservation (related to a specific TB) using resources only on slots of the same type / characteristic (e.g., PSFCH slots or NON-PSFCH slots). For example, after the TX UE selects transmission resources related to a specific TB, if the TX UE cannot maintain the same (PSSCH) TB size between the initial transmission and retransmission due to the overhead of PSFCH resources, the TX UE can be configured to trigger / perform transmission resource reselection.

[0180] Based on embodiments of this disclosure, even if the number of PSFCHs required for simultaneous transmission is less than the UE's capacity, the sum of the required transmission power of the PSFCHs may still exceed the UE's maximum transmission power. For ease of explanation, the situation where the sum of the required transmission power of the PSFCHs exceeds the UE's maximum transmission power can be referred to as a power-limited situation. For example, in a power-limited situation, the UE may assume / determine at least one of the following PSFCHs: one containing NACK (or ACK) information, one PSFCH related to the NACK feedback scheme (in multicast) (e.g., one containing NACK information), and / or one multicast (or unicast) related PSFCHs as (relatively) high-priority PSFCHs. For example, in a power-limited situation, the UE may assume / determine at least one of the following PSFCHs: one containing ACK (or NACK) information, one PSFCH related to the ACK / NACK feedback scheme (in multicast), and / or one unicast (or multicast) related PSFCHs as (relatively) low-priority PSFCHs. For example, the UE may omit (relatively) low-priority PSFCH transmissions until it escapes the power-limited situation. Here, for example, under power constraints on PSFCH transmissions of the same priority, the UE can omit a specific PSFCH transmission from among PSFCH transmissions of the same priority. In this case, the specific PSFCH transmission can be determined by the UE implementation.

[0181] Based on embodiments of this disclosure, a method for in-device coexistence of NR / LTE SL is proposed. For example, when the first SL communication and the second SL communication are TDM, the interruption time or handover time generated by switching between the first SL communication and the second SL communication can be configured in an SL region with a relatively low priority. For example, when the first SL communication and the second SL communication are TDM, the interruption time or handover time generated by switching between the first SL communication and the second SL communication can be configured in a (TB) retransmission-related SL region. For example, when the first SL communication and the second SL communication are TDM, the interruption time or handover time generated by switching between the first SL communication and the second SL communication can be configured in an SL region with a (relatively) large parameter set. For example, when the first SL communication and the second SL communication are TDM, the interruption time or handover time generated by switching between the first SL communication and the second SL communication can be configured in an SL region with a (relatively) small parameter set. For example, when the first SL communication and the second SL communication are TDM, the interruption time or handover time generated by switching between the first SL communication and the second SL communication can be configured in an SL region with a (relatively) small number of time slots that (partially) overlap with the desired interruption time or handover time. For example, the parameter set may include subcarrier spacing, CP length, CP type, etc. For example, the handover between the first SL communication and the second SL communication may include switching from the first SL communication to the second SL communication. For example, the handover between the first SL communication and the second SL communication may include switching from the second SL communication to the first SL communication. For example, the interruption time or handover time may be the time when operations related to SL transmission and / or SL reception are interrupted. For example, the first SL communication may be an NR-based SL transmission, while the second SL communication may be an LTE-based SL transmission. For example, the first SL communication may be an NR-based SL transmission, while the second SL communication may be an LTE-based SL reception. For example, the first SL communication may be an NR-based SL reception, while the second SL communication may be an LTE-based SL transmission. For example, the first SL communication may be an NR-based SL reception, while the second SL communication may be an LTE-based SL reception.

[0182] Based on embodiments of this disclosure, the UE can anticipate / determine that the resource pool is (limitedly) specified such that the difference in frequency resource size between the sub-channels constituting the resource pool is less than or equal to a pre-configured threshold. For example, the base station / network can (limitedly) configure the resource pool to the UE such that the difference in frequency resource size between the sub-channels constituting the resource pool is less than or equal to the pre-configured threshold. Additionally, for example, when configuring transmission resources on N time slots, the UE can determine the relevant TB size based on the frequency size of the transmission resources on time slots excluding UNNOR_SB. For example, when configuring transmission resources on N time slots, the UE can determine the relevant TB size based on the frequency size of the transmission resources on time slots including UNNOR_SB. For example, when configuring transmission resources on N time slots, the UE can determine the relevant TB size based on the (minimum) frequency size among the frequency sizes of the transmission resources on the N time slots. For example, when configuring transmission resources on N time slots, the UE can determine the relevant TB size based on the (maximum) frequency size among the frequency sizes of the transmission resources on the N time slots. For example, when configuring transmission resources on N time slots, the UE can determine the relevant TB size based on the average frequency size of the transmission resources on the N time slots. Here, for example, all transmission resources on the N time slots can be (restrictively) selected to have the same number of sub-channels.

[0183] Based on embodiments of this disclosure, within the CR evaluation (time) window, among the SL-licensed reserved (transmission) resources belonging to a future window, the UE can be configured to perform (CR) counting differently for resources not used by the UE due to receiving ACK information (from the RX UE) (hereinafter, the first resource) and resources not used by the UE due to preemption operations (hereinafter, the second resource). For example, the UE can calculate / obtain the CR value by treating / considering the first and second resources differently. For example, when resources associated with transmissions of (relatively) high-priority packets (above or equal to a pre-configured threshold) and transmission resources used by the TX UE for transmissions of (relatively) low-priority packets (below or equal to a pre-configured threshold) overlap, the preemption operation can be an operation in which the UE reselects transmission resources for transmissions of (corresponding) low-priority packets. For example, the UE can be configured not to perform (CR) counting for the first resource, and the UE can be configured to perform (CR) counting for the second resource. For example, the UE can be configured to perform (CR) counting for the first resource, and the UE can be configured not to perform (CR) counting for the second resource. For example, the UE can be configured to perform a CR count on a first resource and a second resource. Alternatively, the UE can be configured not to perform a CR count on the first resource and the second resource. For example, the UE can be configured not to perform a CR count on existing resources not used for preemption, or to perform a CR count based on reselected (replaced) resources. This can be effective, for example, in operations related to the second resource, particularly when reserved (transmission) resources associated with the SL license are (partially) preempted, in cases where all resources associated with the SL license are reselected and / or resources replacing the preempted resources are reselected.

[0184] Based on embodiments of this disclosure, a base station can perform cross-RAT scheduling for a UE. For example, an NR base station (e.g., a gNB) can perform cross-RAT scheduling for LTE Mode 3 SL SPS for a UE. Here, for example, when the UE performs LTE SL transmission on an LTE licensed carrier, and / or when the LTE modem (or UE) is within the coverage area of ​​the LTE base station (e.g., an eNB) (on an LTE licensed carrier) (e.g., within coverage state), the UE can perform power control related to LTE SL transmission based on the downlink path loss between the LTE base station and the LTE modem (or UE). For example, when the UE performs LTE SL transmission on a Smart Transport System (ITS) dedicated carrier (e.g., a carrier where no eNB exists), and / or the LTE modem (or UE) is outside the coverage area of ​​the LTE base station (on an LTE licensed carrier) (e.g., outside coverage state), the UE can perform power control related to LTE SL transmission based on the downlink path loss between the NR base station and the NR modem (or UE). For example, when the UE performs LTE SL transmission on an ITS dedicated carrier, and / or when the LTE modem (or UE) is outside the coverage area of ​​the LTE base station (on an LTE licensed carrier), the UE can perform power control related to LTE SL transmission without taking into account downlink path loss between the base station and the UE.

[0185] For example, an LTE base station can perform cross-RAT scheduling of SL CG (Type 1) for a UE in NR Mode 1. Here, for example, when the UE performs NR SL transmission on an NR licensed carrier, and / or when the NR modem (or UE) is within the coverage area of ​​the NR base station (on an NR licensed carrier) (e.g., within coverage area), the UE can perform power control related to NR SL transmission based on the downlink path loss between the NR base station and the NR modem (or UE). For example, when the UE performs NR SL transmission on an ITS-only carrier (e.g., where there is no NR base station carrier), and / or when the NR modem (or UE) is outside the coverage area of ​​the NR base station (on an NR licensed carrier) (e.g., outside coverage area), the UE can perform power control related to NR SL transmission based on the downlink path loss between the LTE base station and the LTE modem (or UE). For example, when the UE performs NR SL transmission on an ITS dedicated carrier, and / or when the NR modem (or UE) is outside the coverage area of ​​the NR base station (on an NR licensed carrier), the UE can perform power control related to NR SL transmission without taking into account downlink path loss between the base station and the UE.

[0186] For example, the UE can be configured to perform power control related to LTE SL transmissions or NR SL transmissions (scheduled across RATs) based on the downlink path loss between the (pre-configured) synchronization reference base station (e.g., gNB or eNB) and the UE (e.g., NR modem / UE, LTE modem / UE). Similarly, the UE can be configured to perform power control related to LTE SL transmissions or NR SL transmissions (scheduled across RATs) based on the downlink path loss between the (pre-configured) RSRP measurement reference base station (e.g., gNB or eNB) and the UE (e.g., NR modem / UE, LTE modem / UE).

[0187] Based on embodiments of this disclosure, the UE can send an SCI including resource reservation information according to the following rules (partially). Here, for example, for ease of explanation, the maximum number of resources that the UE can signal / reserve through one SCI can be referred to as N_MAX. For example, N_MAX can be configured for the UE or can be configured in advance. For example, N_MAX can be configured for the UE in a resource pool-specific manner or can be configured in advance. For example, for ease of description, the number of resources that the UE signals / reserves through one SCI can be referred to as N_SIG. For example, N_SIG can be less than or equal to N_MAX. For example, N_SIG can be determined by the implementation of the UE. For example, N_SIG can be configured for the UE or can be configured in advance. For example, for ease of description, the number of resources selected by the UE can be referred to as N_RSC. For example, N_RSC can be the number of resources related to a specific TB transmission selected by the UE within a selection window.

[0188] For example, on an SCI sent on the last reserved resource (related to N_RSC), the UE can only signal / send information about the pre-configured number of previously reserved resources. For example, on an SCI sent on the last reserved resource (related to N_RSC), the UE can only signal / send information about the maximum number (e.g., N_MAX-1 or N_SIG-1) of previously reserved resources that can be signaled via a single SCI. For example, previously reserved resources can be the (relative or closest) previously reserved resources on the timeline since the SCI sent on the last resource. For example, on an SCI sent on the last reserved resource (related to N_RSC), the UE can only signal / send information about the (reserved) resources used to send the SCI.

[0189] For example, on an SCI sent on the first reserved resource (associated with N_RSC), the UE may only signal / send information about a pre-configured number of future reserved resources. For example, on an SCI sent on the first reserved resource (associated with N_RSC), the UE may only signal / send information about the maximum number (e.g., N_MAX-1 or N_SIG-1) of future reserved resources that can be signaled via a single SCI. For example, future reserved resources may be the (relative or closest) future reserved resources in the timeline starting from the SCI sent on the first resource.

[0190] For example, on an SCI transmitted on the remaining reserved resources (associated with N_RSC), the UE can signal / transmit information about the pre-configured number of past reserved resources and information about the pre-configured number of future reserved resources. For example, the pre-configured number can be a rounded value of (N_MAX-1) / 2, a rounded-up value, or a rounded-down value. For example, the pre-configured number can be a rounded value of (N_SIG-1) / 2, a rounded-up value, or a rounded-down value. For example, past reserved resources can be the (relative or closest) past reserved resources on the timeline starting from the SCI transmitted on the remaining resources. For example, future reserved resources can be the (relative or closest) future reserved resources on the timeline starting from the SCI transmitted on the remaining resources.

[0191] For example, when the UE periodically performs resource reservation, the rules proposed above can be applied (with limitations). For example, the rules proposed above can be applied (with limitations) to periodically generated services / packets. For example, when the UE non-periodically performs resource selection / reservation, the rules proposed above can be applied (with limitations). For example, the rules proposed above can be applied (with limitations) to non-periodically generated services / packets. For example, when the N_MAX value is configured as 3, the rules proposed above can be applied (with limitations). For example, when the N_MAX value is configured as 2, the rules proposed above can be applied (with limitations). For example, when the N_SIG value is configured as 3, the rules proposed above can be applied (with limitations). For example, when the N_SIG value is configured as 2, the rules proposed above can be applied (with limitations).

[0192] For example, in this paper, information about reserved resources can be interpreted as information about the location / quantity of time / frequency resources related to the (reserved) resources, information bits about which resource in the reserved resources (based on an SCI) (e.g., CEILING (log2(N_MAX)) bits or CEILING (log2(N_SIG)) bits, where CEILING (X) is a function that derives the smallest integer value greater than or equal to X), or bits of pre-configured size, etc.

[0193] Based on embodiments of this disclosure, PUSCH transmissions carrying SL (control) information (e.g., SL HARQ feedback information) and (other) SL channel / signal (hereinafter, OT_SLCH) transmissions may (partially) overlap in the time domain. In this case, the UE can determine, according to (part of) the following rules, which channels / signals / information to omit from the transmission, or which channels / signals / information to transmit. Here, for example, for ease of explanation, the SL (control) information carried on the PUSCH may be referred to as PIGGY_SLUCI.

[0194] For example, the UE can (firstly) compare the (SL) priorities between PIGGY_SLUCI and OT_SLCH. In this case, for example, if PIGGY_SLUCI has a relatively higher (SL) priority than OT_SLCH, the UE can omit the OT_SLCH transmission. Otherwise, for example, if OT_SLCH has a relatively higher (SL) priority than PIGGY_SLUCI, the UE can (again) compare the priorities between OT_SLCH and PUSCH. In this case, additionally, the following rules can be applied.

[0195] For example, if PUSCH has a relatively higher priority than OT_SLCH, the UE can omit the OT_SLCH transmission. In this case, (A) the UE can (still) carry PIGGY_SLUCI on the PUSCH and transmit it. Or, (B) since PIGGY_SLUCI has a relatively lower priority than OT_SLCH, the UE can omit carrying PIGGY_SLUCI on the PUSCH and the UE can omit the PIGGY_SLUCI transmission.

[0196] For example, if OT_SLCH has a relatively higher priority than PUSCH, the UE can omit PUSCH transmission. In this case, (A) the UE can also omit PIGGY_SLUCI transmission. Or, (B) when PIGGY_SLUCI is not carried over to PUSCH, and PIGGY_SLUCI-related channel transmissions (e.g., PUCCH) (hereinafter, ORI_ULCH) do not (partially) overlap with OT_SLCH transmissions in the time domain, the UE can perform both ORI_ULCH and OT_SLCH transmissions. If ORI_ULCH (partially) overlaps with OT_SLCH transmissions in the time domain, the UE can perform only the transmission with the relatively higher priority.

[0197] Based on embodiments of this disclosure, when a UE fails to select a (re)transmission resource with a maximum number of retransmissions (hereinafter, MX_RTNUM) within a selection window (hereinafter, LD_WIN) configured based on delay budget and / or latency budget, a portion of the following rules may be applied. Here, for example, LD_WIN may be associated with (generated) packets and / or (interlocked) LCH (and / or priority) (with the highest priority). For example, MX_RTNUM may be associated with packets (e.g., MAC PDUs) and / or (interlocked) LCH (and / or priority) (with the highest priority).

[0198] For example, the UE can select as many HARQ RTT-based (re)transmission resources as possible within LD_WIN. Subsequently, by triggering a new or additional resource (re)selection operation, the UE can select resources (excluding the selected resources) for the remaining retransmission counts (hereinafter, RM_RTNUM). For example, the UE can select as many (re)transmission resources (pairs) within LD_WIN that can perform HARQ feedback-based retransmissions. Subsequently, by triggering a new or additional resource (re)selection operation, the UE can select resources for RM_RTNUM retransmissions. Here, for example, the UE can select RM_RTNUM retransmission resources by assuming blind retransmission. For example, it can be configured to perform blind retransmissions on the selected RM_RTNUM retransmission resources. For example, when the above rules are applied, the (actual) number of retransmission resources selected based on newly or additionally triggered resource (re)selection operations may be limited by the number of selectable (maximum) retransmission resources within the delay budget and may be less than or equal to RM_RTNUM. For example, the delay budget can be related to (generated) packets and / or (associated) LCH (and / or priority) (with the highest priority). For example, within LD_WIN, the UE can (with exception) select a mixture of HARQ feedback-based retransmission resources and blind retransmission resources, and the UE can select MX_RTNUM retransmission resources. Here, for example, the UE can preferentially (within LD_WIN) select as many HARQ feedback-based retransmission resources as possible, and then the UE can select as many blind retransmission resources as the remaining retransmission count. Or, for example, the UE can preferentially (within LD_WIN) select as many blind retransmission resources as possible, and then the UE can select as many HARQ feedback-based retransmission resources as the remaining retransmission count. Here, for example, when the above rules are applied, even if MAC PDU (and / or LCH (related data)) is enabled for HARQ (feedback), it can be interpreted as allowing blind retransmission or blind retransmission resource selection for the UE (with exception). For example, when applying the rules of this disclosure, LD_WIN can be interpreted as a selection window with a value less than the delay budget and / or (virtual) delay budget. For example, the delay budget can be associated with (generated) grouping and / or (associated) LCH (and / or priority) (with the highest priority). For example, a selection window with a value smaller than the delay budget can be a selection window with a delay budget that is smaller than the pre-configured (proportional) value. Here, for example, the rule can be applied only restrictively to HARQ (feedback) enabling MAC PDUs and / or LCH (related data). For example, the rule can be applied only restrictively to HARQ (feedback) disabling MAC PDUs and / or LCH (related data).

[0199] Based on embodiments of this disclosure, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the ratio (hereinafter, X_VAL) of the number of selectable resources that should be minimum guaranteed after a sensed (high interference) resource exclusion operation can be configured differently for the UE. For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the SL RSRP threshold (e.g., PSSCH DMRS RSRP, PSCCH DMRS RSRP) for the sensed (high interference) resource exclusion operation can be configured differently for the UE (a combination of priorities related to packets / data of the UE performing the sense and priorities related to detected packets / data of another UE). For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, the minimum size of the selection window can be configured differently for the UE (e.g., (minimum) T2 value (configured for each priority)). For example, depending on whether periodic resource reservation is allowed for the UE on the resource pool, whether an additional area that must guarantee X_VAL can be configured within the selection window can be configured differently for the UE. For example, depending on whether periodic resource reservations are allowed for the UE in the resource pool, the size (related to the additional area) can be configured differently for the UE. For example, depending on whether periodic resource reservations are allowed for the UE in the resource pool, the X_VAL that triggers the increase of the SL RSRP threshold can be configured differently for the UE (for the additional area or based on the additional area).

[0200] For example, depending on whether only aperiodic resource reservation / selection is allowed for the UE on the resource pool, the ratio (hereinafter, X_VAL) of the number of selectable resources that must be guaranteed at a minimum after a sense-based (high interference) resource exclusion operation can be configured differently for the UE. For example, depending on whether only aperiodic resource reservation / selection is allowed for the UE on the resource pool, the SL RSRP threshold (e.g., PSSCH DMRS RSRP, PSCCH DMRS RSRP) for sense-based (high interference) resource exclusion operations can be configured differently for the UE (a combination of priorities related to packets / data of the UE performing the sense and priorities related to detected packets / data of another UE). For example, depending on whether only aperiodic resource reservation / selection is allowed for the UE on the resource pool, the minimum size of the selection window can be configured differently for the UE (e.g., (minimum) T2 value (configured for each priority)). For example, depending on whether only aperiodic resource reservation / selection is allowed for the UE on the resource pool, whether an additional area that must guarantee X_VAL can be configured within the selection window can be configured differently for the UE. For example, depending on whether non-periodic resource reservation / selection is allowed for the UE in the resource pool, the size (related to the additional area) can be configured differently for the UE. For example, depending on whether non-periodic resource reservation / selection is allowed for the UE in the resource pool, the X_VAL that triggers the SL RSRP threshold increase can be configured differently for the UE (for the additional area or based on the additional area).

[0201] Based on embodiments of this disclosure, if the size of the frequency resources in the resource pool (hereinafter, POOL_FRQSIZE) is not a multiple of the size of the sub-channel (hereinafter, SUB_SIZE), then the UE can be configured to (limitedly) (additionally) use an RB of MOD(POOL_FRQSIZE, SUB_SIZE) (where MOD(X, Y) is a function that derives the remainder when X is divided by Y) only when the UE uses all sub-channels on the resource pool to perform transmissions. Here, for example, the RB of MOD(POOL_FRQSIZE, SUB_SIZE) can be configured for a single sub-channel.

[0202] Based on embodiments of this disclosure, when a UE performs periodic resource reservation, the amount of reserved resources can be determined / derived according to the following rules (partially). Here, for example, the rule can be applied restrictively only when the resource reservation period is less than a pre-configured threshold. For example, the rule can be applied restrictively only when the resource reservation period is greater than a pre-configured threshold.

[0203] For example, the UE can randomly select a value within a pre-configured range (e.g., 5 to 15). For ease of explanation, the randomly selected value can be referred to as RAN_CVAL. The UE can then calculate / obtain X_VAL by multiplying RAN_CVAL by (i) SC_VAL divided by RER_PD, (ii) the MAX (20, RER_PD) value, or (iii) REF_PD divided by RER_PD. Here, the UE can consider / determine the resulting value obtained by (again) multiplying X_VAL by a pre-configured scaling factor (e.g., 10 or 1) as the amount of reserved resources.

[0204] For example, SC_VAL can be at least one of the following: PDB (in its own buffer and / or associated with LCH data (with the highest priority)) (when performing resource reservation), delay requirement, selection window size, MAX(100 ms, selection window size (based on data PDB)) and / or MAX(100 ms, (data) PDB). For example, RER_PD can be the resource reservation period. For example, the value obtained by dividing SC_VAL by RER_PD can be CEILING(SC_VAL / RER_PD) or FLOOR(SC_VAL / RER_PD). ​​For example, REF_PD can be a pre-configured (reservation period) value. For example, the value obtained by dividing REF_PD by RER_PD can be CEILING(REF_PD / RER_PD) or FLOOR(REF_PD / RER_PD). ​​Here, for example, CEILING(N) can be a function that derives an integer value greater than or equal to N, and FLOOR(N) can be a function that derives an integer value less than or equal to N.

[0205] For example, the range of candidate values ​​for RAN_CVAL can be configured to be scaled by CEILING (X / Y) (or FLOOR (X / Y)). For example, a scaling factor (different for each TX_PVAL) can be configured for the range of candidate values ​​for RAN_CVAL. Here, for example, TX_PVAL can be a resource reservation period value for a (TX) UE performing sensing operations and / or resource reservation. For example, X can be a pre-configured (period) value. For example, the X value can be configured differently or independently for the UE depending on TX_PVAL and / or depending on whether TX_PVAL exceeds a pre-configured threshold (period) value. For example, if the TX_PVAL value is (relatively) short (shorter than the pre-configured threshold (period) value), a (pre-configured) (relatively) small X value can be applied / used, and if not (for example, if the TX_PVAL value is (relatively) long (longer than the pre-configured threshold (period) value), a (pre-configured) (relatively) large X value can be applied / used, and if not (for example, if the TX_PVAL value is (relatively) long (longer than the pre-configured threshold (period) value), a (pre-configured) (relatively) small X value can be applied / used.

[0206] For example, the rules of this disclosure can be configured to be applied restrictively only when TX_PVAL is less than a pre-configured reference (period) value (e.g., 100 ms).

[0207] For example, when the above rules are applied, regardless of how the TX_PVAL value changes (for TX_PVAL values ​​less than the pre-configured reference (period) value), the CEILING (X / Y) value can be interpreted as being maintained within a certain (pre-configured) ratio / value (by (implicitly) adjusting the value of X). For example, when the above rules are applied, regardless of how the TX_PVAL value changes (for TX_PVAL values ​​greater than the pre-configured reference (period) value), the CEILING (X / Y) value can be interpreted as being maintained within a certain (pre-configured) ratio / value (by (implicitly) adjusting the value of X).

[0208] For example, Y can be assumed to be TX_PVAL. For example, Y can be regarded as a pre-configured (periodic) value. Here, for example, if Y is regarded as a pre-configured (periodic) value, the value of Y can be configured differently or independently for the UE depending on whether TX_PVAL and / or TX_PVAL exceeds the pre-configured threshold (periodic) value. For example, if the TX_PVAL value is (relatively) small (less than the pre-configured threshold (period) value), a (pre-configured) relatively small Y value can be applied / used; otherwise (e.g., if the TX_PVAL value is (relatively) large (greater than the pre-configured threshold (period) value), a (pre-configured) relatively large Y value can be applied / used. Here, for example, the rule can be configured to be applied restrictively only when TX_PVAL is less than the pre-configured reference (period) value (e.g., 100 ms). The rule is applied restrictively only when the value is within a certain range (ms). Additionally, for example, when the above rule is applied, regardless of changes in the TX_PVAL value (for TX_PVAL values ​​less than the pre-configured reference (period) value), it can be interpreted that CEILING (X / Y) is maintained at a certain (pre-configured) ratio / value (through (implicit) adjustment of Y). For example, when the above rule is applied, regardless of changes in the TX_PVAL value (for TX_PVAL values ​​greater than the pre-configured reference (period) value), it can be interpreted that CEILING (X / Y) is maintained at a certain (pre-configured) ratio / value (through (implicit) adjustment of Y).

[0209] Based on embodiments of this disclosure, the UE can perform a sense-based resource exclusion operation. Here, it is assumed that the resource reservation period of another UE that the UE successfully detects / decodes is P_VAL. In this case, for example, the UE can assume that CEILING (REF_VAL / P_VAL) resources are reserved / exist for a period of P_VAL, and the UE can perform a resource exclusion operation (for the resources). For example, the UE can assume that CEILING (MAX (100ms, (PDB-based selection window size) of data) / MAX (20, P_VAL)) resources (here, for example, MAX (X, Y) is a function deriving the maximum value of X and Y) are reserved / exist for a period of P_VAL, and the UE can perform a resource exclusion operation (for the resources). For example, the UE can assume that CEILING ((PDB-based selection window size of data) / MAX (20, P_VAL)) resources are reserved / exist for a period of P_VAL, and the UE can perform a resource exclusion operation (for the resources). For example, REF_VAL can be a pre-configured value (from the base station / network). For example, REF_VAL can be the size of the selection window. For example, REF_VAL can be the size of the selection window configured by the (TX) UE performing sensing operations and / or resource reservation. For example, REF_VAL can be the result value obtained by multiplying the selection window size by a pre-configured ratio. For example, REF_VAL can be configured differently or independently for the UE based on the resource reservation period value (hereinafter, P_VALTX) of the (TX) UE performing sensing operations and / or resource reservation. For example, REF_VAL can be configured differently or independently for the UE depending on whether P_VALTX exceeds a pre-configured threshold (period) value. For example, REF_VAL can be configured differently or independently for the UE based on the P_VAL value. For example, REF_VAL can be configured differently or independently for the UE depending on whether P_VAL exceeds a pre-configured threshold (period) value.

[0210] For example, if the P_VALTX or P_VAL value is (relatively) short (shorter than the pre-configured threshold (period) value), then a (pre-configured) (relatively) small REF_VAL value can be applied / used; otherwise (e.g., if the P_VALTX or P_VAL value is (relatively) long (longer than the pre-configured threshold (period) value), then a (pre-configured) (relatively) large REF_VAL value can be applied / used. Similarly, if the P_VALTX or P_VAL value is (relatively) short (shorter than the pre-configured threshold (period) value), then a (pre-configured) (relatively) large REF_VAL value can be applied / used; otherwise (e.g., if the P_VALTX or P_VAL value is (relatively) long (longer than the pre-configured threshold (period) value), then a (pre-configured) (relatively) small REF_VAL value can be applied / used. Here, for example, the rule can be configured to apply / use only when P_VALTX or P_VAL is less than the pre-configured reference (period) value (e.g., 100). The rule is restricted to applying only when P_VALTX or P_VAL is greater than a pre-configured reference (period) value (e.g., 100ms). For example, this rule can be configured to apply restrictively only when P_VALTX or P_VAL is greater than a pre-configured reference (period) value (e.g., 100ms). Alternatively, for example, when the above rule is applied, regardless of changes in the P_VALTX or P_VAL value (for P_VALTX or P_VAL less than the pre-configured reference (period) value), it can be interpreted that CEILING (REF_VAL / P_VAL) is maintained at a certain (pre-configured) ratio / value (through (implicit) adjustment of REF_VAL or P_VAL). For example, when the above rule is applied, regardless of changes in the P_VALTX or P_VAL value (for P_VALTX or P_VAL greater than the pre-configured reference (period) value), it can be interpreted that CEILING (REF_VAL / P_VAL) is maintained at a certain (pre-configured) ratio / value (through (implicit) adjustment of REF_VAL or P_VAL).

[0211] For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a resource pool-specific manner. For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a service type-specific manner. For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a service priority-specific manner. For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a QoS requirement-specific manner (e.g., URLLC / EMBB service, reliability, latency). For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a broadcast type-specific manner (e.g., unicast, multicast, broadcast). For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a manner specific to the (resource pool) congestion level (e.g., CBR) (independently or differently). For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) in a manner specific to the SL HARQ feedback scheme (e.g., NACK feedback only, ACK / NACK feedback) (independently or differently). For example, the rules and / or related parameters of this disclosure may be applied to the UE (independently or differently) depending on whether the resource reservation period is less than or greater than a pre-configured threshold (independently or differently).

[0212] Figure 12 This illustration shows a process for a UE to select resources within a selection window, based on an embodiment of the present disclosure. Figure 12 The embodiments can be combined with various embodiments of this disclosure.

[0213] Figure 13 This invention illustrates a method for a UE to exclude specific resources within a selection window, based on embodiments of the present disclosure. Figure 13 The embodiments can be combined with various embodiments of this disclosure.

[0214] refer to Figure 12In step S1210, the TX UE can receive SCI from at least one UE (e.g., UE #1 to UE #N). For example, the TX UE can receive SCI from at least one UE within a sensing window. Here, for example, the SCI may include information related to the resource reservation period. For example, the SCI sent by UE #1 may include information related to the reservation period of the resources reserved / selected by UE #1, the SCI sent by UE #2 may include information related to the reservation period of the resources reserved / selected by UE #2, and the SCI sent by UE #N may include information related to the reservation period of the resources reserved / selected by UE #N.

[0215] For example, in NR resource allocation mode 2, at least one UE can use an SCI to send the priority of an SL transmission to a TX UE. For example, the TX UE can decode the SCI, and the TX UE can perform sensing and / or resource (re)selection based on the priority. For example, the resource (re)selection process may include the steps of the TX UE identifying candidate resources in a resource selection window, and the steps of the TX UE selecting resources for (re)transmission from the identified candidate resources.

[0216] In step S1220, the TX UE can determine the size of the selection window. In this disclosure, the selection window can be referred to as the resource selection window. For example, the resource selection window can be the time interval during which the TX UE selects resources for SL transmission. For example, after the TX UE triggers resource (re)selection, the resource selection window can start from T1 ≥ 0, and the resource selection window can be limited by the TX UE's remaining packet delay budget.

[0217] In step S1230, the TX UE can determine the resources to be excluded from resource selection based on the size of the selection window and the resource reservation period. For example, in the step of identifying candidate resources in the resource selection window by the TX UE, when a specific resource is indicated by an SCI received by the TX UE from at least one UE, and if the L1 SL RSRP measurement for the specific resource exceeds the SL RSRP threshold, the TX UE may not identify the specific resource as a candidate resource. That is, in this case, the TX UE may not select the specific resource as a resource for SL transmission. For example, the SL RSRP threshold can be determined based on the priority of the SL transmission indicated by the SCI received by the TX UE and the priority of the SL transmission on the resource selected by the TX UE.

[0218] For example, the TX UE can determine which resources to exclude from resource selection based on Table 6.

[0219] [Table 6]

[0220] Referring to Table 6, when (a), (b), and (c) are satisfied, the TX UE can obtain resources from the resource set (S A The corresponding resource (Rx,y) is excluded from the selection. That is, the TX UE may not select resources that satisfy conditions (a), (b), and (c). In this case, for example, the TX UE may assume that CEILING(REF_VAL / P_VAL) resources are reserved / existing for a period of P_VAL, and the TX UE may perform resource exclusion operations for these resources. For example, REF_VAL can be the size of the selection window. For example, REF_VAL can be the size of the selection window configured by the (TX) UE performing sensing operations and / or resource reservations. For example, Y = CEILING(X) can be a function that derives the smallest integer value greater than or equal to X.

[0221] exist Figure 13 In this embodiment, it is assumed that the TX UE receives the SCI from another UE based on resource A. Furthermore, it is assumed that 5 times the resource reservation period (P) is equal to the selection window size (S) (i.e., 5...). P = S). Specifically, assume the resource reservation period is 10ms and the selection window size is 50ms. In this case, the TX UE can determine CEILING (S / P) resources (i.e., Figure 13 Resource B) is selected / reserved by the UE that sent the SCI. The TX UE may not select the CEILING (S / P) resource (i.e. Figure 13 Resource B in the middle). On the other hand, the TX UE can determine the resources after CEILING (S / P) resources (i.e., Figure 13 Resource C) which was not selected / reserved by the UE that sent the SCI, can be allowed for TX UE selection. Figure 13 Resource C.

[0222] According to existing technology, when a TX UE receives an SCI from another UE based on resource A, the TX UE can determine that the CEILING (100 [ms] / P) resources are selected / reserved by the UE that sent the SCI, and the TX UE can choose not to select any of the CEILING (100 [ms] / P) resources. Here, P can be the resource reservation period in 'ms'. In other words, according to existing technology, the TX UE cannot select... Figure 13 Resources C and B are excluded. This could lead to unnecessary resource exclusion operations by the UE. On the other hand, according to the proposed method, based on the selection window size and resource reservation period, the TX UE can perform efficient resource exclusion operations.

[0223] Return to reference Figure 12 In step S1240, the TX UE can select at least one resource from the remaining resources excluding the excluded resources. Furthermore, the TX UE can send PSCCH and / or PSSCH based on this at least one resource.

[0224] Based on embodiments of this disclosure, during CR calculation / counting, based on HARQ feedback (e.g., ACK) received from the RX UE, the UE may omit the unused SL (retransmission) reserved resources (signed via SCI) in the CR calculation / counting. For example, based on HARQ feedback (e.g., ACK) received from the RX UE, the UE may omit the number of sub-channels associated with the unused SL (retransmission) reserved resources (signed via SCI) in the CR calculation / counting. For example, based on UL / SL prioritization, the UE may omit the unused SL (retransmission) reserved resources (signed via SCI) in the CR calculation / counting. For example, based on UL / SL prioritization, the UE may omit the number of sub-channels associated with the unused SL (retransmission) reserved resources (signed via SCI) in the CR calculation / counting. For example, UL / SL prioritization can be a case where the UE omits SL transmissions due to overlap between high-priority UL transmissions and SL transmissions. Here, for example, the above rule can be configured to be applied restrictively only when a receive based on HARQ feedback (e.g., ACK) releases the (related) SL license (e.g., retransmission reserved resources). For example, the above rule can be configured to be applied restrictively only when a receive based on HARQ feedback (e.g., ACK) clears the (related) SL license (e.g., retransmission reserved resources). For example, the above rule can be configured to be applied restrictively only when the (interlocked) HARQ buffer is flushed. For example, the above rule can be configured to be applied restrictively only to the case of SL licenses generated for the transmission of a single MAC PDU. For example, the rule can be configured to be applied restrictively only to the case of SL licenses generated for the transmission of multiple MAC PDUs.

[0225] Alternatively, for example, even if a receipt of HARQ feedback (e.g., ACK) releases / clears the (related) SL license (e.g., retransmission reserved resources) or refreshes the (associated) HARQ buffer, the UE can be configured to (still) reflect the resource in the CR calculation / count because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources. For example, even if a receipt of HARQ feedback (e.g., ACK) releases / clears the (related) SL license (e.g., retransmission reserved resources) or refreshes the (associated) HARQ buffer, the UE can be configured to (still) reflect the resource in the CR calculation / count in a resource pool-specific manner because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources. For example, even if a HARQ feedback (e.g., ACK) is received to release / clear the (related) SL license (e.g., retransmission reserved resources), or the (associated) HARQ buffer is refreshed, because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources, the UE can be configured to reflect the resource in a service type-specific manner (still) in CR calculation / counting. For example, even if the (related) SL license (e.g., retransmission reserved resource) is released / cleared based on the reception of HARQ feedback (e.g., ACK) or the (associated) HARQ buffer is refreshed, the UE can be configured to reflect the resource in the CR calculation / count in a (resource pool) congestion level-specific manner because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resource.

[0226] For example, due to preemption and / or UL / SL prioritization, even if a UE cannot use previously reserved (retransmission) resources or the UE releases / clears previously reserved (retransmission) resources and performs (retransmission) resource reselection, the UE can be configured to (still) reflect the resource in the CR calculation / count because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources. For example, due to preemption and / or UL / SL prioritization, even if a UE cannot use previously reserved (retransmission) resources or the UE releases / clears previously reserved (retransmission) resources and performs (retransmission) resource reselection, the UE can be configured to (still) reflect the resource in the CR calculation / count in a resource pool-specific manner because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources. For example, due to preemption and / or UL / SL prioritization, even if a UE cannot use previously reserved (retransmission) resources or the UE releases / clears previously reserved (retransmission) resources and performs (retransmission) resource reselection, the UE can be configured to reflect the resource in a service priority-specific manner in CR calculation / counting because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources. For example, due to preemption and / or UL / SL prioritization, even if a UE cannot use previously reserved (retransmission) resources or the UE releases / clears previously reserved (retransmission) resources and performs (retransmission) resource reselection, the UE can be configured to reflect the resource in a (resource pool) congestion level-specific manner in CR calculation / counting because other (some) UEs on the system may not be able to use the released / cleared (retransmission) resources.

[0227] Here, for example, when the above rules are applied, the UE can be prevented from excessively reserving (retransmission) resources during retransmission operations based on HARQ feedback reception.

[0228] Based on embodiments of this disclosure, the second SCI format can be determined as follows. For example, the second SCI format may include second SCI format A and / or second SCI format B.

[0229] For example, the second SCI format A can

[0230] - Excludes the (TX UE) area ID field and communication range field, where the communication range field may be related to the transmission of MAC PDUs (e.g., TB) and / or (interlocked) services, and / or

[0231] - Configured to be used / specified when (depending on whether PSSCH decoding is successful) a HARQ feedback scheme in which ACK or NACK information is sent (based on unicast and / or multicast) (hereinafter, HARQ_FDTYPE1) (and / or (multicast) NACK-only HARQ feedback scheme (which is not based on the distance between the TX UE and the RX UE) is used / specified, and / or

[0232] - Configured to be used / specified when performing SL communication based on unicast and / or multicast (and / or when using / requesting a multicast HARQ feedback scheme based on HARQ_FDTYPE3), and / or

[0233] - Includes HARQ feedback enable / disable indicator (field) (hereinafter, HQ_EDFD).

[0234] For example, the second SCI format B can

[0235] - Includes the (TX UE) area ID field and communication range field, where the communication range field may be associated with the transmission of MACPDUs (e.g., TB) and / or (interlocked) services, and / or

[0236] - Configured to be used / specified when a (multicast) NACK-only HARQ feedback scheme based on the distance between the TX UE and the RX UE (hereinafter, HARQ_FDTYPE2) (and / or a (multicast) NACK-only HARQ feedback scheme not based on the distance between the TX UE and the RX UE (hereinafter, HARQ_FDTYPE3)) is used, and / or

[0237] - Configured to be used / specified when performing multicast-based SL communication (and / or when using / requesting a multicast HARQ feedback scheme based on HARQ_FDTYPE2 (and / or HARQ_FDTYPE3), and / or

[0238] - Includes HARQ feedback enable / disable indicator (field).

[0239] Here, for example, on second SCI format A and / or second SCI format B, a field (hereinafter, MID_FIELD) can be defined to determine which parameter-based PSFCH resource should be used to send HARQ feedback for the notification to the RX UE (from the TX UE) and / or what method / type of HARQ feedback should be performed. For example, this field can have a pre-configured size (e.g., 1 bit).

[0240] Specifically, for example, if MID_FIELD is indicated as 0, the RX UE can specify / determine that the (group) member ID parameter (e.g., M_ID) in the formula used to determine the PSFCH resource (index) is 0, and the RX UE can determine / derive the PSFCH resource (index) used to send HARQ feedback based on M_ID = 0. For example, if MID_FIELD is indicated as 0, the RX UE can specify / determine that the (group) member ID parameter (e.g., M_ID) in the formula used to determine the PSFCH resource (index) is 0, and the RX UE can apply a (unicast-based) HARQ feedback scheme that sends (pre-configured) ACK or NACK information. For example, if MID_FIELD is indicated as 0, the RX UE can specify / determine that the (group) member ID parameter (e.g., M_ID) in the formula used to determine the PSFCH resource (index) is 0, and the RX UE can apply the HARQ feedback scheme of HARQ_FDTYPE2. For example, if MID_FIELD is indicated as 0, the RX UE can specify / determine that the (group) member ID parameter (e.g., M_ID) is 0 in the formula used to determine the PSFCH resource (index), and the RX UE can apply the HARQ feedback scheme of HARQ_FDTYPE3.

[0241] For example, if MID_FIELD is indicated as 1, the RX UE can specify / determine the member ID parameter (e.g., M_ID) value in the formula used to determine the PSFCH resource (index) as a (member ID) value provided by its (own) upper layer (e.g., V2X layer), and the RX UE can determine / derive the PSFCH resource (index) through which it sends HARQ feedback based on the (member ID) value. For example, if MID_FIELD is indicated as 1, the RX UE can specify / determine the member ID parameter (e.g., M_ID) value in the formula used to determine the PSFCH resource (index) as a (member ID) value provided by its (own) upper layer (e.g., V2X layer), and the RX UE can apply a (multicast-based) HARQ feedback scheme for sending ACK or NACK information based on the (member ID) value.

[0242] For example, if the HQ_EDFD field is indicated as disabled, the MID_FIELD field can be specified / configured to a pre-configured (specific) value (e.g., 0 or 1) (hereinafter, FX_VAL). For example, if the TX UE does not request HARQ feedback from the RX UE, the MID_FIELD field can be specified / configured to FX_VAL. For example, when the TX UE sends a HARQ disabled MACPDU (and / or LCH-related data) to the RX UE, the MID_FIELD field can be specified / configured to FX_VAL. For example, when the TX UE performs a blind retransmission (for transmitting a MAC PDU), the MID_FIELD field can be specified / configured to FX_VAL. Here, for example, when the above rules are applied (if the HQ_EDFD field is indicated as disabled), when the MID_FIELD field is specified as a value other than FX_VAL, it may be considered to indicate other (pre-configured) information / status (e.g., the type of broadcast (e.g., the difference between multicast and unicast, the difference between multicast and / or unicast and broadcast)) (e.g., this can be interpreted as a reserved status (to be used in future versions)).

[0243] For example, it can be configured to signal broadcast type information and / or HARQ feedback scheme information via predefined fields (e.g., 2 bits) on second SCI format A and / or second SCI format B and / or first SCI format. For example, the UE can send broadcast type information and / or HARQ feedback scheme information via predefined fields (e.g., 2 bits) on second SCI format A and / or second SCI format B and / or first SCI format. Here, for example, the 2-bit predefined field can indicate any of the unicast HARQ feedback scheme, multicast (type 1) HARQ feedback option 1, multicast (type 2) HARQ feedback option 2, or broadcast. For example, the unicast HARQ feedback scheme can take the form of ACK / NACK HARQ feedback. For example, according to the unicast HARQ feedback scheme, the UE can consider the (group) member ID parameter (e.g., M_ID) value in the formula used to determine the PSFCH resource (index) to be 0, and then determine / derive the PSFCH resource (index) used to send HARQ feedback. For example, the form of multicast (Type 1) HARQ feedback option 1 can be NACK HARQ feedback only. For example, according to multicast (Type 1) HARQ feedback option 1, the UE can assume that the (group) member ID parameter (e.g., M_ID) value in the formula used to determine the PSFCH resource (index) is 0, and then can determine / derive the PSFCH resource (index) through which HARQ feedback is sent. For example, the form of multicast (Type 2) HARQ feedback option 2 can be ACK / NACK HARQ feedback. For example, according to multicast (Type 2) HARQ feedback option 2, the UE can assume that the (group) member ID parameter (e.g., M_ID) value in the formula used to determine the PSFCH resource (index) is a (member ID) value provided by the (UE's) upper layer, and then can determine / derive the PSFCH resource (index) through which HARQ feedback is sent. For example, the broadcast scheme can be in the form of disabling HARQ feedback.

[0244] Figure 14 The process of a base station performing size alignment for SL DCI is illustrated based on an embodiment of the present disclosure. Figure 14 It may be combined with various embodiments of this disclosure.

[0245] Based on embodiments of this disclosure, multiple resource pools can be configured or pre-configured for the UE. For example, the multiple resource pools can be multiple Mode 1 resource pools. For example, in step S1410, the base station can send information related to the multiple resource pools to the UE. In the above case, an index field (hereinafter, RP_FID) of the (interlocked) resource pool can be defined on the Mode 1 DCI (e.g., DCI format 3_0) sent by the base station. Here, for example, when the base station sends the Mode 1 DCI to the UE, the base station can notify the UE which resource pool the Mode 1 DCI is scheduled for. For example, when the base station sends the Mode 1 DCI to the UE, the base station can notify which resource pool the Mode 1 DCI is associated with.

[0246] In the above scenario, for example, if the following parameters and / or operations (related to mode 1 operations) can be configured differently across multiple mode 1 resource pools, then the payload size (of the mode 1 DCI) can vary depending on the resource pool targeted by the mode 1 DCI.

[0247] Example) The maximum number of time resources (e.g., time slots) that can be signaled via Mode 1 DCI and / or the maximum number of time resources (e.g., time slots) that can be signaled via SCI, and / or

[0248] Example) The number of sub-channels constituting the resource pool, and / or

[0249] Example) Whether CG actions are configured, and / or whether mode 1 DCI (e.g., DCI format 3_0) is monitored based on CRC scrambled with SL-CS-RNTI (e.g., determining the presence of a (CG) configuration index field (on the CG / DG related mode 1 DCI) accordingly), and / or

[0250] Example) Whether PUCCH resources are configured, and / or whether reporting operations for SL HARQ feedback information via PUCCH are configured, and / or the HARQ codebook type applied when reporting SL HARQ feedback information via PUCCH, and / or

[0251] Example) The number of candidate values ​​that can be specified as the time interval between the PSFCH and PUCCH slots, for example, the number of candidate values ​​that can be specified as the time interval between the PSFCH and PUCCH slots when a reporting operation for SL HARQ feedback information via PUCCH is configured, and / or

[0252] Example) The maximum number of (SL) HARQ process IDs, for example, the maximum number of (SL) HARQ process IDs associated with Mode 1 DCI operations and / or SL operations.

[0253] However, since the UE cannot know in advance which resource pool the Mode 1 DCI sent by the base station is targeted, the problem may arise because the UE must perform blind search / decoding for the payload size of multiple Mode 1 DCIs (which may be different for each resource pool).

[0254] To mitigate the aforementioned problems, for example, the payload sizes of multiple Mode 1 DCIs associated with multiple resource pools can be aligned. For instance, in step S1420, the base station can match the payload sizes of multiple Mode 1 DCIs associated with multiple resource pools. In step S1430, the UE can monitor multiple Mode 1 DCIs. For ease of explanation, the case where the payload sizes of multiple Mode 1 DCIs associated with multiple resource pools are aligned can be referred to as Option A. Specific examples of Option A will be described below.

[0255] For example, the payload sizes of the remaining Mode 1 DCIs can be aligned (e.g., zero-padding) to the largest payload size among multiple (different) Mode 1 DCIs associated with multiple resource pools. For instance, a base station can align the payload sizes of multiple Mode 1 DCIs to the largest payload size by performing zero-padding on the payloads of the remaining Mode 1 DCIs. Table 7 shows examples of matching payload sizes of multiple Mode 1 DCIs (e.g., DCI format 3_0).

[0256] [Table 7]

[0257] Referring to Table 7, when multiple resource pools are configured for the UE up to a size equal to the largest DCI among the multiple DCIs (e.g., DCI format 3_0), the base station can perform zero-padding on the remaining DCIs. For example, it can be assumed that four resource pools are configured for the UE (e.g., resource pool A, resource pool B, resource pool C, resource pool D), and the DCI associated with resource pool A is the largest. In this case, by performing zero-padding on the DCIs associated with the remaining resource pools (e.g., the DCI associated with resource pool B, the DCI associated with resource pool C, and the DCI associated with resource pool D), the base station can align the sizes of multiple DCIs (e.g., the sizes of the DCIs associated with resource pool A, the DCI associated with resource pool B, the DCI associated with resource pool C, and the DCI associated with resource pool D) with each other. Furthermore, the UE can monitor or receive multiple DCIs based on the aligned DCI sizes. Additionally, when the size of DCI format 3_0 is not aligned with the size of DCI format 3_1, the base station can align the size of DCI format 3_0 with the size of DCI format 3_1 by performing zero-padding on the DCI format with the smaller size. Here, for example, DCI format 3_0 can be a DCI used for scheduling NR PSCCH and NR PSSCH in a cell, and DCI format 3_1 can be a DCI used for scheduling LTE PSCCH and LTE PSSCH in a cell.

[0258] For example, the payload sizes of the remaining Mode 1 DCIs can be aligned (e.g., truncated (fields or bits)) to the smallest payload size among multiple (different) Mode 1 DCI payload sizes associated with multiple resource pools. For example, by truncating the payloads of the remaining Mode 1 DCIs, the base station can align the payload sizes of multiple Mode 1 DCIs to the smallest payload size.

[0259] For example, the payload sizes of multiple (different) Mode 1 DCIs associated with multiple resource pools can be aligned to a pre-configured (reference) payload size (e.g., truncation or zero-padding of (fields or bits)). For example, by performing truncation or zero-padding on the payloads of multiple Mode 1 DCIs, the base station can align the payload sizes of multiple Mode 1 DCIs to a pre-configured (reference) payload size.

[0260] For example, all parameters and / or operations can be configured identically across multiple resource pools (related to Mode 1 operation). For ease of explanation, the scenario of configuring all parameters and / or operations identically across multiple resource pools can be referred to as Option B. For example, according to Option B, the UE may not expect the payload size of the Mode 1 DCI used for scheduling for different resource pools to be (partially) different. For example, according to Option B, the UE may determine / assume that the payload size of the Mode 1 DCI used for scheduling for different resource pools is entirely the same.

[0261] For example, the index information (bits) of the (interlocked) resource pool can be masked and / or scrambled to a Mode 1 DCI-related CRC. For ease of explanation, the case where the index information (bits) of the (interlocked) resource pool is masked and / or scrambled to a Mode 1 DCI-related CRC can be referred to as Option C. For example, the Mode 1 DCI-related CRC can be X bits of the (pre-configured) CRC least significant bits (LSB). For example, X can be a positive integer. For example, X can be 3.

[0262] Additionally, for example, the payload size can be the same between the DCI format (e.g., DCI format 0_1 ​​or DCI format 0_0) (hereinafter, REF_UUDCI) associated with pre-configured Uu communication (e.g., communication between the base station and the UE) and the Mode 1 DCI (e.g., DCI format 3_0). For example, the base station can align the payload size between REF_UUDCI and Mode 1 DCI (e.g., DCI format 3_0). For example, to prevent exceeding the (maximum) number of blind decodes (that the UE can support), the payload size can be aligned between REF_UUDCI and Mode 1 DCI. For example, to prevent exceeding the (maximum) number of DCI format budgets, the payload size can be aligned between REF_UUDCI and Mode 1 DCI.

[0263] In the above scenarios, for example, the maximum payload size (hereinafter, REP_SLSIZE) among the payload sizes of the Mode 1 DCIs associated with multiple resource pools derived from Option A, and the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for LTE SL scheduling, can be aligned. For example, the minimum payload size (hereinafter, REP_SLSIZE) among the payload sizes of the Mode 1 DCIs associated with multiple resource pools derived from Option A, and the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for LTE SL scheduling, can be aligned. Additionally, for example, the payload sizes of REP_SLSIZE and REF_UUDCI can be aligned. For example, the base station can align the payload size of the SL DCI format (e.g., DCI format 3_1) used by the NR base station for LTE SL scheduling and REP_SLSIZE, and the base station can align the payload size of REF_UUDCI and REP_SLSIZE. In this scenario, for example, if the payload size of REF_UUDCI is greater than REP_SLSIZE, the payload sizes of all Mode 1 DCIs associated with multiple resource pools can be aligned to the payload size of REF_UUDCI. Alternatively, if the payload size of REF_UUDCI is greater than REP_SLSIZE, the base station can align the payload sizes of Mode 1 DCIs associated with multiple resource pools to the payload size of REF_UUDCI by performing zero-padding on the payload sizes of these DCIs.

[0264] For example, if the base station aligns the (total) payload size among Mode 1 DCIs (associated with multiple resource pools) based on option A, the base station can be configured to align the payload size by the total payload. For ease of explanation, the case where the base station is configured to align the payload size by the total payload can be referred to as method A. For example, according to method A, the base station performs zero-padding on the Mode 1 DCI with the (relatively) small total payload size, so that it has the same (payload) size as the Mode 1 DCI with the largest total payload size. For example, according to method A, the base station performs zero-padding after the last (LSB) bits of the Mode 1 DCI with the (relatively) small total payload size, so that it has the same (payload) size as the Mode 1 DCI with the largest total payload size.

[0265] For example, if a base station aligns the (total) payload size across Mode 1 DCIs (associated with multiple resource pools) based on option A, the base station can be configured to align the total payload size by aligning the size per field. For ease of illustration, the case where the base station is configured to align the overall payload size by aligning the size per field can be referred to as method B. For example, according to method B, when the size of a specific field (e.g., a frequency resource allocation field) of a Mode 1 DCI associated with resource pool X is greater than the size of the same destination field of a Mode 1 DCI associated with resource pool Y, the base station can align the field size of the latter with the field size of the former. In this case, for example, the base station can perform zero-padding on the most significant bit (MSB) of the latter field. For example, the base station can perform zero-padding on the least significant bit (LSB) of the latter field.

[0266] For example, when applying method B, it can be interpreted that the field types / configurations of the Mode 1 DCI associated with multiple resource pools are the same. For example, when applying method B, it can be interpreted that the order of the field (settings) of the Mode 1 DCI associated with multiple resource pools is the same.

[0267] For example, when the field types / configurations for a Mode 1 DCI associated with multiple resource pools are different, method B can be applied to the fields that exist in the same way, while method A can be applied to the remaining fields. In this way, for example, the payload size can be configured to be aligned between Mode 1 DCIs. For example, by (exceptively) applying method A, the payload size can be configured to be aligned between Mode 1 DCIs.

[0268] For example, the size of fields for the same purpose and / or the presence of fields for a specific purpose may differ between Mode 1 DCIs associated with multiple resource pools, and / or the number of Mode 1 resource pools configured for each carrier may differ. Therefore, taking this into consideration, the field indicating the index of the carrier on which SL (transmission) resources are scheduled (hereinafter, CIF) can be defined to appear in the Mode 1 DCI prior to the RP_FID field. For example, in Mode 1 DCI, the CIF field can be defined as the first field, the RP_FID field as the second field, and the (frequency / time) resource information field can be defined after the third field. For example, the CIF can be defined to appear in the Mode 1 DCI prior to the PSSCH and / or PSCCH-related time / frequency (transmission) resource information (e.g., location / number) fields. For example, the CIF (associated with the first PSSCH transmission) can be defined to appear in the Mode 1 DCI prior to the PSCCH (starting) frequency (transmission) resource information field.

[0269] For example, the above rules can be applied only restrictively to operations based on method A. Similarly, the above rules can be applied only restrictively to operations based on method B. In this way, for example, the UE can decode the CIF field and / or the RP_FID field, regardless of whether the field size changes due to resource pool and / or carrier.

[0270] For example, a synchronization reference source for Mode 1 SL operation and / or optionally for Mode 1 SL operation can be configured identically on multiple resource pools. Alternatively, a synchronization reference source for Mode 1 SL operation and / or optionally for Mode 1 SL operation can be configured differently on multiple resource pools.

[0271] For example, overlapping SL CSI reporting delay boundaries may be permitted (with exception) between SL CSI reporting operations triggered based on multiple resource pools. For example, in the case of SL CSI reporting operations triggered based on multiple resource pools, the UE may (with exception) be permitted to trigger an SL CSI report based on another resource pool before the UE (successfully) receives the SL CSI information for the SL CSI report triggered based on a specific resource pool.

[0272] For example, the rules of this disclosure may be applied only restrictively to DCIs related to Mode 1 CG Type 2. For example, the rules of this disclosure may be applied only restrictively to Mode 1 DG DCIs.

[0273] In step S1440, the UE can perform SL transmission based on the received DCI.

[0274] According to the proposed method, since the maximum number of blind decoding attempts supported by the UE can be limited, the complexity of the UE due to blind decoding of DCI can be reduced. Furthermore, according to the proposed method, since the maximum number of DCI format budgets for the UE can be limited, the complexity of the UE due to blind decoding of DCI can be reduced.

[0275] Based on embodiments of this disclosure, when performing SL communication (e.g., unicast or multicast) between UEs, when the UE changes the synchronization source / reference (hereinafter, SL_REF), the UE can declare a (SL) RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. For example, if the UE changes SL_REF to another SL_REF after establishing a session (related to SL communication (link)), the UE can declare a (SL) RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. Similarly, if the UE changes SL_REF to another SL_REF before establishing a session (related to SL communication (link)), the UE can declare a (SL) RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection. For example, when performing SL communication (e.g., unicast or multicast) between UEs, if the difference between the (time / frequency) synchronization associated with the changed SL_REF and the (time / frequency) synchronization associated with the SL_REF before the change exceeds a pre-configured threshold (e.g., CP length), the UE may declare a (SL)RLF for the corresponding SL communication (link) and / or SL session and / or PC5 RRC connection.

[0276] Based on embodiments of this disclosure, the UE can transmit multiple PSFCHs. For ease of explanation, the number of multiple PSFCH transmissions can be referred to as K_VAL. In this case, for example, the sum of the transmission power required for multiple PSFCH transmissions may exceed the UE's maximum transmission power value and / or the PCMAX value calculated based on K_VAL PSFCH transmissions (hereinafter, the power limitation case). In this case, the UE can determine the PSFCHs to be transmitted according to the following rule (part of the rule), and the UE can determine the transmission power (related to the transmitted PSFCHs). Here, for example, it can be assumed / considered that K_VAL is less than or equal to the maximum number of PSFCHs that the UE can transmit simultaneously.

[0277] For example, after the UE divides the PSFCH into groups for each (interlocked) priority value, the UE can increase the number of PSFCH groups transmitted in descending order of priority value (e.g., a larger priority value is interpreted as a higher priority). In this case, when a power limit condition is reached, (A) the UE can omit (all) transmissions for the last involved priority PSFCH group (hereinafter, PF_GR_PL) (which causes a power limit condition), and / or (B) to avoid reaching a power limit condition, the UE can determine / select how many PSFCHs to perform among those included in PF_GR_PL, depending on the UE implementation. Additionally, for example, when transmitting the highest priority PSFCH group, if a power limit condition is reached, the UE can determine / select how many PSFCH transmissions to perform among those included in the PSFCH group, depending on the UE implementation, to avoid reaching a power limit condition.

[0278] For example, (in the example scenario described above, where rules are applied, e.g., power limiting), the minimum number of PSFCHs transmitted simultaneously can be configured as the (total) number of PSFCHs with a priority higher than or equal to priority K and / or the (total) number of PSFCHs belonging to a PSFCH group (hereinafter, NPF_K). For example, (in the example scenario described above, where rules are applied, e.g., power limiting), the minimum number of PSFCHs transmitted simultaneously can be configured as the (total) number of PSFCHs with a priority lower than or equal to priority K and / or the (total) number of PSFCHs belonging to a PSFCH group (hereinafter, NPF_K). For example, (in the example scenario described above, where rules are applied, e.g., power limiting), the minimum number of PSFCHs transmitted simultaneously can be configured as the maximum of NPF_K and 1. Here, for example, a power limit should not be reached when a total number of PSFCH transmissions with a priority higher than or equal to priority K and / or a total number of PSFCH transmissions belonging to a PSFCH group are performed. Similarly, a power limit should not be reached when a total number of PSFCH transmissions with a priority lower than or equal to priority K and / or a total number of PSFCH transmissions belonging to a PSFCH group are performed.

[0279] Based on embodiments of this disclosure, a UE can be configured to apply restrictions on preemption resources only when it reserves resources with a reservation period longer than a pre-configured threshold. For example, a UE can be configured to apply restrictions on preemption resources only when it reserves resources with a reservation period shorter than a pre-configured threshold. For example, preemption resources can be resources on which preemption checks are performed. For example, these restrictions can be time-domain restrictions.

[0280] For example, when a UE reserves (transmission) resources for a (transmission) resource reservation period (P) longer than the (pre-configured) threshold in the interval from (SL logic) slot #K to (SL logic) slot #(K+P), the UE can be configured to perform preemption checks and / or applications only for the reserved resources corresponding to the period interval including slot #(K+P) (e.g., slot #(K+P) to slot #(K+2P-1)) and / or (SL logic) slot #(K+P) (SL logic), and the UE can be configured not to perform preemption checks and / or applications for subsequent (period-related) resources (hereinafter, F_RSC).

[0281] For example, when a UE reserves (transmission) resources for a (transmission) resource reservation period (P) shorter than the (pre-configured) threshold in the interval from (SL logic) slot #K to (SL logic) slot #(K+P), the UE can be configured to perform preemption checks and / or applications only for the reserved resources corresponding to the period interval including slot #(K+P) (e.g., slot #(K+P) to slot #(K+2P-1)) and / or (SL logic) slot #(K+P) (SL logic), and the UE can be configured not to perform preemption checks and / or applications for subsequent (period-related) resources (hereinafter, F_RSC).

[0282] For example, (in the example scenarios above) information regarding the (future) time interval in which preemption checks and / or applications are performed and / or information regarding the number of resource reservation periods can be configured to the UE by the base station / network, or can be pre-configured specifically by the resource pool. For example, (in the example scenarios above) information regarding the (future) time interval in which preemption checks and / or applications are performed and / or information regarding the number of resource reservation periods can be configured to the UE by the base station / network, or can be pre-configured specifically by the resource pool. For example, (in the example scenarios above) information regarding the (future) time interval in which preemption checks and / or applications are performed and / or information regarding the number of resource reservation periods can be configured to the UE by the base station / network, or can be pre-configured specifically by the service type. For example, (in the example scenarios above) information regarding the (future) time interval in which preemption checks and / or applications are performed and / or information regarding the number of resource reservation periods can be configured to the UE by the base station / network, or can be pre-configured specifically by the (resource pool) congestion level (e.g., CBR).

[0283] For example, for preemption checks and / or for (preemption-based) resource reselection operations, the rules proposed above can be configured for the UE to be applied restrictively only when the resource reservation period is greater than the processing time T3 required to sense and / or generate (the channel / signal to be transmitted). For example, the UE may not perform preemption checks and / or apply them for F_RSC.

[0284] For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, the preemption check and / or application for F_RSC can be configured to be performed by the UE. For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, the UE can be configured to perform preemption checks and / or applications for F_RSC only if the UE has MAC PDUs and / or (interlocked) LCH-related data to transmit on F_RSC. For example, when the resource reservation period is less than or equal to the processing time (T3) required to sense and / or generate (to transmit) channels / signals, the UE can be configured to always perform preemption checks and / or applications for F_RSC.

[0285] Based on embodiments of this disclosure, when the UE converts the transmission resource reservation period (P_TX, milliseconds) into the number of (SL logic) time slots, the UE can use the formula CEILING (N / Y) The number of (SL logical) time slots is obtained using P_TX. Here, for example, the Y parameter can be the number of (UL) time slots based on (interlocked) parameter sets (e.g., subcarrier spacing) that exist within a 20 ms interval and are signaled from the PSBCH. For example, the Y parameter can be the total number of (actual) (UL) time slots included in (UL) time slots based on (interlocked) parameter sets (based on Uu communication parameter sets) that are signaled from the PSBCH within a 20 ms interval (the number / position of symbols that satisfy the SL parameter set and / or constitute SL time slots). For example, the X parameter can be the number of (UL) time slots that can be designated as SL time slots. For example, the X parameter can be the number of (UL) time slots that can be applied to a bitmap associated with a resource pool used for SL communication. In this disclosure, for example, a time slot can be interpreted (broadly) as a physical time slot or a (SL) logical time slot.

[0286] Based on embodiments of this disclosure, a UE within the coverage area that is in an (RRC) idle state and located within the network's coverage area may not expect the SCS value and / or CP type / length (by the network / base station) used to export the TDD UL / DL configuration field value on the PSBCH to be configured differently from the SCS value and / or CP type / length associated with SL communication. For example, a UE outside the coverage area that is outside the network's coverage area may not expect the SCS value and / or CP type / length (by the network / base station) used to export the TDD UL / DL configuration field value on the PSBCH to be configured differently from the SCS value and / or CP type / length associated with SL communication. For example, the UE may determine that the SCS value and / or CP type / length used to export the TDD UL / DL configuration field value on the PSBCH to be configured differently from the SCS value and / or CP type / length associated with SL communication.

[0287] The applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a resource pool-specific manner (independently or differently). For example, the applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a service type-specific manner (independently or differently). For example, the applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a service priority-specific manner (independently or differently). For example, the applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a QoS requirement-specific manner (e.g., URLLC / EMBB service, reliability, latency). For example, the applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a broadcast type-specific manner (e.g., unicast, multicast, broadcast). For example, the applicability of the rules and / or related parameters of this disclosure can be configured for the UE in a (resource pool) congestion level-specific manner (e.g., CBR). For example, the applicability of the rules and / or related parameters of this disclosure may be configured for the UE independently or differently depending on the specific SL HARQ feedback scheme (e.g., NACK feedback only, ACK / NACK feedback). For example, the applicability of the rules and / or related parameters of this disclosure may be configured for the UE independently or differently depending on whether the resource reservation period is less than or greater than a pre-configured threshold. For example, the applicability of the rules and / or related parameters of this disclosure may be configured for the UE independently or differently depending on whether PUCCH-based SLHARQ feedback reporting operation is configured.

[0288] Figure 15 A method for a first device to perform wireless communication is illustrated based on an embodiment of the present disclosure. Figure 15 The embodiments can be combined with various embodiments of this disclosure.

[0289] refer to Figure 15 In step S1510, the first device may receive first sidelink control information (SCI) from the second device in a time slot, including information related to the resource reservation period. In step S1520, the first device may determine the size of the selection window based on the remaining packet delay budget. In step S1530, the first device may obtain the value of N by applying the CEILING function to the value obtained by dividing the size of the selection window by the resource reservation period. In step S1540, the first device may determine that resources are reserved in N time slots spaced apart by units of the resource reservation period after the time slot in which the second device receives the first SCI. In step S1550, the first device may select resources for SL communication within the selection window based on this determination. For example, N may be a positive integer.

[0290] For example, at least one resource reserved by the first device in N time slots spaced apart in units of resource reservation periods can be excluded from the candidate resources.

[0291] For example, resources may include Physical Side Link Control Channel (PSCCH) resources and Physical Side Link Shared Channel (PSSCH) resources. For example, based on the fact that the number of Resource Blocks (RBs) included in a sub-channel of the PSCCH resource is the same as the number of RBs included in a sub-channel of the PSSCH resource, a demodulation reference signal (DMRS) for the PSSCH can be mapped onto a PSSCH resource that does not overlap with the PSCCH resource in the time domain, and a second SCI can be mapped starting from the first symbol to which the DMRS for the PSSCH is mapped. Additionally, for example, a first device may transmit the second SCI based on the PSSCH resource.

[0292] Additionally, for example, the first device may send a first SCI to the third device based on PSCCH resources, and the first device may send a second SCI and data to the third device based on PSSCH resources. For example, the second SCI may be either a second SCI format A or a second SCI format B. Second SCI format A may include broadcast type information indicating a combination of HARQ feedback type and broadcast type, and second SCI format B may include information related to the ID of the first device's zone and information related to communication range requirements.

[0293] Additionally, for example, based on (i) the second SCI is a second SCI format A, and (ii) the broadcast type information indicating the multicast type and the HARQ feedback type based on ACK / NACK, the first device can determine the physical sidechain feedback channel (PSFCH) resource associated with the PSSCH resource based on the third device's member ID. For example, the third device's member ID could be an ID provided from a higher layer of the third device.

[0294] Additionally, for example, based on (i) the second SCI is a second SCI format A, and (ii) the broadcast type information indicates the multicast type and the HARQ feedback type based on NACK only, the first device can determine the PSFCH resource associated with the PSSCH resource based on the third device's member ID. For example, the third device's member ID can be zero.

[0295] Additionally, for example, based on the fact that the second SCI is in second SCI format B, the first device can determine the PSFCH resource associated with the PSSCH resource based on the member ID of the third device. For example, the member ID of the third device can be zero.

[0296] Additionally, for example, the first device may perform a reference signal received power (RSRP) measurement on the resources scheduled via the first SCI. For example, if the result of the RSRP measurement is greater than an RSRP threshold, at least one resource reserved by the first device in N time slots spaced apart in units of resource reservation periods may be excluded from the candidate resources.

[0297] For example, the first SCI may include a first priority associated with the transmission of the second device, and the RSRP threshold may be determined based on the first priority and a second priority associated with the transmission of the first device.

[0298] For example, the size of the selection window can be determined based on Quality of Service (QoS) requirements.

[0299] For example, if the size of the selection window is greater than the resource reservation period, the value of N can be obtained by applying the Ceiling function to the value obtained by dividing the size of the selection window by the resource reservation period.

[0300] The proposed method can be applied to apparatuses according to various embodiments of this disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to receive first sidelink control information (SCI) including information related to a resource reservation period from the second device in a time slot. Additionally, the processor 102 of the first device 100 can determine the size of a selection window based on the remaining packet delay budget. Furthermore, the processor 102 of the first device 100 can obtain the value of N by applying the Ceiling function to the value obtained by dividing the size of the selection window by the resource reservation period. Then, the processor 102 of the first device 100 can determine the resources to be reserved in N time slots spaced apart by units of the resource reservation period after the time slot in which the second device receives the first SCI. Based on this determination, the processor 102 of the first device 100 can select resources for SL communication within the selection window. For example, N can be a positive integer.

[0301] Based on embodiments of this disclosure, a first device configured to perform wireless communication can be provided. For example, the first device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. The one or more processors may execute instructions to: receive first sidelink control information (SCI) from a second device in a time slot, including information related to a resource reservation period; determine the size of a selection window based on a remaining packet delay budget; obtain a value N by applying a CEILING function to the value obtained by dividing the size of the selection window by the resource reservation period; determine that resources will be reserved by the second device in N time slots spaced apart by units of the resource reservation period after the time slot in which the first SCI is received; and select resources for SL communication within the selection window based on this determination. For example, N may be a positive integer.

[0302] Based on embodiments of this disclosure, an apparatus configured to control a first user equipment (UE) can be provided. The apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. The one or more processors may execute instructions to: receive first sidelink control information (SCI) from a second UE in a time slot, including information related to a resource reservation period; determine the size of a selection window based on a remaining packet delay budget; obtain a value N by applying a CEILING function to the value obtained by dividing the size of the selection window by the resource reservation period; determine that resources will be reserved by the second UE in N time slots spaced apart by units of the resource reservation period after the time slot in which the first SCI is received; and select resources for SL communication within the selection window based on the determination. For example, N may be a positive integer.

[0303] Based on embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. When executed by one or more processors, the instructions can cause one or more processors to: receive first sidelink control information (SCI) including information related to a resource reservation period from a second UE in a time slot by a first device; determine the size of a selection window based on a remaining packet delay budget by the first device; obtain a value of N by the first device applying a CEILING function to a value obtained by dividing the size of the selection window by the resource reservation period; determine by the first device to reserve resources in N time slots spaced apart by units of the resource reservation period after the time slot in which the second UE receives the first SCI; and select resources for SL communication within the selection window based on this determination. For example, N can be a positive integer.

[0304] Figure 16A method for a device to perform wireless communication is illustrated based on embodiments of the present disclosure. Figure 16 The embodiments can be combined with various embodiments of this disclosure.

[0305] refer to Figure 16 In step S1610, the device can receive information related to multiple resource pools from the base station. In step S1620, the device can monitor multiple side link (SL) downlink control information (DCI) associated with each of the multiple resource pools. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, the size of the first SL DCI may be the largest among the multiple SL DCIs before at least one zero bit is appended to it. For example, based on the configuration of multiple resource pools for the device, the size of the multiple SL DCIs with at least one zero bit appended may be the same as the size of the first SL DCI.

[0306] For example, at least one zero bit can be appended to multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the first SL DCI.

[0307] Additionally, for example, the device can monitor Long Term Evolution (LTE) SL DCIs. For example, multiple SL DCIs can be DCIs used for scheduling NR SL resources, and LTE SL DCIs can be DCIs used for scheduling LTE SL resources. For example, based on the fact that the size of an LTE SL DCI is smaller than the size of a first SL DCI before at least one zero bit is appended, the size of an LTE SL DCI with at least one zero bit appended can be the same as the size of the first SL DCI. For example, at least one zero bit can be appended to an LTE SL DCI until the size of the LTE SL DCI is the same as the size of the first SL DCI. For example, based on the fact that the size of a first SL DCI is smaller than the size of an LTE SL DCI before at least one zero bit is appended, the size of multiple SL DCIs with at least one zero bit appended can be the same as the size of the LTE SL DCI. For example, at least one zero bit can be appended to multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the LTE SL DCI.

[0308] Additionally, for example, the device can monitor the Uu DCI used for scheduling uplink (UL) or downlink (DL) resources. For example, based on the fact that the number of different DCI sizes configured to be monitored exceeds the DCI format budget, the size of multiple SL DCIs with at least one zero bit appended can be the same as the size of the Uu DCI. For example, at least one zero bit can be appended to multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the Uu DCI.

[0309] The proposed method can be applied to devices according to various embodiments of this disclosure. First, the processor 102 of device 100 can control the transceiver 106 to receive information related to multiple resource pools from a base station. Additionally, the processor 102 of device 100 can control the transceiver 106 to monitor multiple side-link (SL) downlink control information (DCI) associated with each of the multiple resource pools. For example, the multiple SL DCIs may include information for scheduling SL resources across the multiple resource pools. For example, the size of the first SL DCI may be the largest among the multiple SL DCIs before at least one zero bit is appended to it. For example, based on the configuration of multiple resource pools for the device, the size of the multiple SL DCIs with at least one zero bit appended may be the same as the size of the first SL DCI.

[0310] Based on embodiments of this disclosure, a device configured to perform wireless communication can be provided. For example, the device may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: receive information associated with multiple resource pools from a base station; and monitor multiple sidelink (SL) downlink control information (DCI) associated with each of the multiple resource pools. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, the size of a first SL DCI may be the largest among the sizes of the multiple SL DCIs before at least one zero bit is appended to it. For example, based on multiple resource pools configured for the device, the size of the multiple SL DCIs with at least one zero bit appended may be the same as the size of the first SL DCI.

[0311] Based on embodiments of this disclosure, an apparatus configured to control a user equipment (UE) can be provided. The apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. The one or more processors may execute instructions to: receive information from a base station related to multiple resource pools; and monitor multiple sidelink (SL) downlink control information (DCI) associated with each of the multiple resource pools. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, the size of a first SL DCI may be the largest among the multiple SL DCIs before at least one zero bit is appended to it. For example, based on multiple resource pools configured for the UE, the size of the multiple SL DCIs with at least one zero bit appended may be the same as the size of the first SL DCI.

[0312] Based on embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. When executed by one or more processors, these instructions enable the one or more processors to: receive information associated with multiple resource pools from a base station; and monitor multiple side-link (SL) downlink control information (DCI) associated with each of the multiple resource pools. For example, the multiple SL DCIs may include information for scheduling SL resources across the multiple resource pools. For example, the size of a first SL DCI may be the largest among the multiple SL DCIs before at least one zero bit is appended to it. For example, based on multiple resource pools configured for the device, the size of the multiple SL DCIs with at least one zero bit appended may be the same as the size of the first SL DCI.

[0313] Figure 17 A method for configuring a base station to perform wireless communication is illustrated based on embodiments of the present disclosure. Figure 17 The embodiments can be combined with various embodiments of this disclosure.

[0314] refer to Figure 17In step S1710, the base station may send information related to multiple resource pools to the device. In step S1720, the base station may append at least one zero bit to multiple side link (SL) downlink control information (DCI) associated with each of the multiple resource pools. In step S1730, the base station may send at least one of the multiple SL DCIs to the device. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, before appending at least one zero bit to the multiple SL DCIs, the size of the first SL DCI may be the largest among the sizes of the multiple SL DCIs. For example, based on the configuration of multiple resource pools for the device, at least one zero bit may be appended to the multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the first SL DCI.

[0315] Additionally, for example, the base station may send a Long Term Evolution (LTE) SL DCI to the device. For example, multiple SL DCIs may be DCIs used for scheduling NR SL resources, and LTE SL DCIs may be DCIs used for scheduling LTE SL resources. For example, based on the fact that the size of an LTE SL DCI is smaller than the size of a first SL DCI before appending at least one zero bit, at least one zero bit may be appended to an LTE SL DCI until the size of the LTE SL DCI is the same as the size of the first SL DCI. For example, based on the fact that the size of a first SL DCI is smaller than the size of an LTE SL DCI before appending at least one zero bit, at least one zero bit may be appended to multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the LTE SL DCI.

[0316] The proposed method can be applied to devices according to various embodiments of this disclosure. First, the processor 202 of base station 200 can control transceiver 206 to send information related to multiple resource pools to the device. Additionally, the processor 202 of base station 200 can append at least one zero bit to multiple sidelink (SL) downlink control information (DCI) associated with each of the multiple resource pools. Furthermore, the processor 202 of base station 200 can control transceiver 206 to send at least one SL DCI from among the multiple SLDCIs to the device. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, before appending at least one zero bit to the multiple SL DCIs, the size of the first SL DCI may be the largest among the sizes of the multiple SLDCIs. For example, based on the configuration of multiple resource pools for the device, at least one zero bit may be appended to the multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the first SL DCI.

[0317] Based on embodiments of this disclosure, a base station configured to perform wireless communication can be provided. For example, the base station may include: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute instructions to: send information to a device related to multiple resource pools; append at least one zero bit to multiple sidelink (SL) downlink control information (DCI) associated with each of the multiple resource pools; and send at least one SL DCI from the multiple SL DCIs to the device. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, before appending at least one zero bit to the multiple SL DCIs, the size of the first SL DCI may be the largest among the sizes of the multiple SL DCIs. For example, based on multiple resource pools configured for the device, at least one zero bit may be appended to the multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the first SL DCI.

[0318] Based on embodiments of this disclosure, an apparatus configured to control a base station can be provided. For example, the apparatus may include: one or more processors; and one or more memories operatively connected to the one or more processors and storing instructions. For example, the one or more processors may execute instructions to: send information related to multiple resource pools to a user equipment (UE); append at least one zero bit to multiple sidelink (SL) downlink control information (DCI) associated with each of the multiple resource pools; and send at least one SL DCI from the multiple SL DCIs to the UE. For example, the multiple SL DCIs may include information for scheduling SL resources on the multiple resource pools. For example, before appending at least one zero bit to the multiple SL DCIs, the size of a first SL DCI may be the largest among the sizes of the multiple SL DCIs. For example, based on multiple resource pools configured for the UE, at least one zero bit may be appended to the multiple SL DCIs until the size of the multiple SL DCIs is the same as the size of the first SL DCI.

[0319] Based on embodiments of this disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. When executed by one or more processors, these instructions can cause the one or more processors to: send information to a device relating to a plurality of resource pools; append at least one zero bit to a plurality of sidelink (SL) downlink control information (DCI) associated with each of the plurality of resource pools; and send at least one SL DCI from the plurality of SL DCIs to the device. For example, the plurality of SL DCIs may include information for scheduling SL resources on the plurality of resource pools. For example, the size of a first SL DCI may be the largest among the sizes of the plurality of SL DCIs before appending at least one zero bit to the plurality of SL DCIs. For example, based on the configuration of a plurality of resource pools for the device, at least one zero bit may be appended to the plurality of SL DCIs until the size of the plurality of SL DCIs is the same as the size of the first SL DCI.

[0320] The various embodiments disclosed herein can be combined with each other.

[0321] In the following, devices to which the respective embodiments of this disclosure may be applied will be described.

[0322] The various descriptions, functions, processes, proposals, methods and / or operating procedures described in this document can be applied to, but are not limited to, various fields requiring wireless communication / connectivity between devices (e.g., 5G).

[0323] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0324] Figure 18 A communication system (1) according to an embodiment of the present disclosure is shown.

[0325] Reference Figure 18The communication system (1) applying various embodiments of this disclosure includes wireless devices, base stations (BS), and networks. Hereinafter, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication / radio / 5G device. Wireless devices may include, but are not limited to, robots (100a), vehicles (100b-1, 100b-2), extended reality (XR) devices (100c), handheld devices (100d), home appliances (100e), Internet of Things (IoT) devices (100f), and artificial intelligence (AI) devices / servers (400). For example, a vehicle may include a vehicle with wireless communication capabilities, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Hereinafter, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices can include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and can take the form of head-up displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices can include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances can include TVs, refrigerators, and washing machines. IoT devices can include sensors and smart meters. For example, the BS and network can be implemented as wireless devices, and a particular wireless device (200a) can operate as a BS / network node relative to other wireless devices.

[0326] In addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of this disclosure may also include narrowband Internet of Things (IoT) for low-power communication. In this case, for example, NB-IoT technology may be an example of low-power wide-area network (LPWAN) technology and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technologies implemented in the wireless devices 100a to 100f of this disclosure may perform communication based on LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN and may be referred to by various names including enhanced machine-type communication (eMTC). For example, LTE-M technology may be implemented as at least one of various standards such as 1) LTE Cat 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine-type communication, and / or 7) LTE M, and is not limited to the aforementioned names. Alternatively or additionally, the wireless communication technology implemented in the wireless devices 100a to 100f of this disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee for low power communication, and is not limited to the names mentioned above. As an example, ZigBee technology may generate personal area networks (PANs) related to low / low power digital communication based on various standards including IEEE 802.15.4, and may be referred to by various names.

[0327] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0328] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, access backhaul integration (IAB)). Wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for transmitting / receiving radio signals can be performed based on various proposals of this disclosure.

[0329] Figure 19 A wireless device according to an embodiment of the present disclosure is shown.

[0330] Reference Figure 19 The first wireless device (100) and the second wireless device (200) can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {the first wireless device (100) and the second wireless device (200)} can correspond to... Figure 18 {Wireless Device (100x) and BS (200)} and / or {Wireless Device (100x) and Wireless Device (100x)}.

[0331] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processors 102 may process information in the memories 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processors 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memories 104. The memories 104 may be connected to the processors 102 and may store various information relating to the operation of the processors 102. For example, one or more memories 104 may store software code including commands for performing part or all of the processing controlled by one or more processors 102, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. Here, one or more processors 102 and one or more memories 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 106 may be connected to one or more processors 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. One or more transceivers 106 may be used interchangeably with one or more radio frequency (RF) units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0332] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. For example, the processors 202 may process information in the memories 204 to generate a third message / signal, and subsequently transmit a radio signal including the third message / signal via the transceivers 206. The processors 202 may receive a radio signal including a fourth message / signal via the transceivers 106, and then store the information obtained by processing the fourth message / signal in the memories 204. The memories 204 may be connected to the processors 202 and may store various information related to the operation of the processors 202. For example, one or more memories 204 may store software code including commands for performing part or all of the processing controlled by one or more processors 202, or for performing the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document. Here, one or more processors 202 and one or more memories 204 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). One or more transceivers 206 may be connected to one or more processors 202 and transmit and / or receive radio signals via one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. One or more transceivers 206 may be used interchangeably with one or more RF units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0333] The hardware components of wireless devices 100 and 200 will now be described in more detail. One or more protocol layers may be implemented, but are not limited to, by one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flows disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and acquire PDUs, SDUs, messages, control information, data, or information in accordance with the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document.

[0334] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more 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 descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using firmware or software, and such firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0335] 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, code, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located internally and / or externally to one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 via various technologies such as wired or wireless connections.

[0336] One or more transceivers 106 and 206 may transmit user data, control information, and / or radio signals / channels mentioned in the methods and / or operating procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive radio signals. For example, one or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operational procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert the processed user data, control information, radio signals / channels, etc., from baseband signals to RF band signals. For this purpose, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0337] Figure 20 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0338] Reference Figure 20 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a pre-encoder (1040), a resource mapper (1050), and a signal generator (1060). It can perform... Figure 20 The operation / functions, but not limited to Figure 19 The processors (102, 202) and / or transceivers (106, 206) can be used. Figure 19Implemented by processors (102, 202) and / or transceivers (106, 206) Figure 20 Hardware components. For example, it can be achieved through... Figure 19 The processors (102, 202) implement boxes 1010 to 1060. Alternatively, they can be implemented using... Figure 19 The processors (102, 202) implement boxes 1010 to 1050, and can be used to... Figure 19 The transceivers (106, 206) are used to implement the 1060 box.

[0339] Can be via Figure 20 The signal processing circuit (1000) converts the codewords into radio signals. In this document, a codeword is a sequence of encoded bits for an information block. The information block may include transport blocks (e.g., UL-SCH transport blocks, DL-SCH transport blocks). Radio signals can be transmitted via various physical channels (e.g., PUSCH and PDSCH).

[0340] Specifically, the codeword can be converted into a scrambled bit sequence by scrambler 1010. The scrambling sequence used for scrambling can be generated based on an initial value, which may include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by modulator 1020. The modulation scheme may include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulation symbol sequence can be mapped to one or more transmission layers by layer mapper 1030. The modulation symbol of each transmission layer can be mapped (pre-encoded) to one or more corresponding antenna ports by pre-encoder 1040. The output z of pre-encoder 1040 can be obtained by combining the output y of layer mapper 1030 with N The M precoding matrix W is obtained by multiplying the two matrices. Here, N is the number of antenna ports, and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0341] Resource mapper 1050 maps modulation symbols for each antenna port to time-frequency resources. Time-frequency resources may include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. Signal generator 1060 can generate radio signals from the mapped modulation symbols, and the generated radio signals can be transmitted to other devices via each antenna. For this purpose, signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0342] Can be with Figure 20 The signal processing procedures (1010~1060) are configured in reverse order for the signal processing procedures used to receive signals in a wireless device. For example, a wireless device (e.g., Figure 19 The receiver (e.g., 100, 200) can receive radio signals from the outside via the antenna port / transceiver. The received radio signals can be converted into baseband signals using a signal recovery unit. For this purpose, the signal recovery unit may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Next, the baseband signals can be recovered into codewords through a resource demapping process, a post-encoding process, a demodulation processor, and a descrambling process. The codewords can be recovered into the original information blocks through decoding. Therefore, the signal processing circuitry (not illustrated) used for receiving signals may include a signal recovery unit, a resource demapping unit, a post-encoder, a demodulator, a descrambler, and a decoder.

[0343] Figure 21 Another example of a wireless device according to an embodiment of this disclosure is shown. The wireless device can be implemented in various forms depending on the use case / service (see reference). Figure 18 ).

[0344] Reference Figure 21 Wireless devices (100, 200) can correspond to Figure 19 The wireless devices (100, 200) can be configured using various elements, components, units / parts and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional components (140). The communication unit may include a communication circuit (112) and one or more transceivers (114). For example, the communication circuit (112) may include... Figure 19 One or more processors (102, 202) and / or one or more memories (104, 204). For example, transceivers (114) may include one or more transceivers. Figure 19One or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit (120) is electrically connected to the communication unit (110), the memory (130), and the add-on components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on programs / codes / commands / information stored in the memory unit (130). The control unit (120) can transmit information stored in the memory unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the memory unit (130).

[0345] The add-on component (140) can be configured in various ways depending on the type of wireless device. For example, the add-on component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device can be implemented in, but is not limited to, the following forms: robot ( Figure 18 100a), vehicles ( Figure 18 100b-1 and 100b-2), XR equipment ( Figure 18 100c), handheld devices ( Figure 18 100d), home appliances ( Figure 18 100e), IoT devices ( Figure 18 100f), digital broadcasting terminals, hologram devices, public safety equipment, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate / environmental devices, AI servers / devices ( Figure 18 400), BS ( Figure 18 (e.g., 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed locations.

[0346] exist Figure 21In the wireless devices (100, 200), all the various elements, components, units / parts and / or modules can be connected to each other via wired interfaces, or at least partially connected wirelessly via communication unit (110). For example, in each of the wireless devices (100, 200), the control unit (120) and the communication unit (110) can be connected via a wired connection, and the control unit (120) and the first unit (e.g., 130, 140) can be wirelessly connected via communication unit (110). Each element, component, unit / part and / or module within the wireless devices (100, 200) may also include one or more elements. For example, the control unit (120) may be constructed from a collection of one or more processors. As an example, the control unit (120) may be constructed from a collection of communication control processors, application processors, electronic control units (ECUs), graphics processing units and memory control processors. As another example, memory (130) can be constructed using random access memory (RAM), dynamic RAM (DRAM), read-only memory (ROM), flash memory, volatile memory, non-volatile memory and / or combinations thereof.

[0347] The implementation will be described in detail below with reference to the accompanying drawings. Figure 21 Examples.

[0348] Figure 22 A handheld device according to an embodiment of the present disclosure is illustrated. The handheld device may include a smartphone, smartpad, wearable device (e.g., a smartwatch or smart glasses), or portable computer (e.g., a laptop). The handheld device may be referred to as a mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), advanced mobile station (AMS), or wireless terminal (WT).

[0349] Reference Figure 22 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a memory unit (130), a power supply unit (140a), an interface unit (140b), and an I / O unit (140c). The antenna unit (108) may be configured as part of the communication unit (110). Boxes 110 to 130 / 140a to 140c correspond to respectively Figure 21 The frame is 110 to 130 / 140.

[0350] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. Control unit 120 can perform various operations by controlling the constituent elements of handheld device 100. Control unit 120 may include an application processor (AP). Memory unit 130 can store data / parameters / programs / codes / commands required to drive handheld device 100. Memory unit 130 can store input / output data / information. Power supply unit 140a can supply power to handheld device 100 and includes wired / wireless charging circuitry, a battery, etc. Interface unit 140b can support connection of handheld device 100 to other external devices. Interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. I / O unit 140c can input or output user-input video information / signals, audio information / signals, data, and / or information. I / O unit 140c may include a camera, microphone, user input unit, display unit 140d, speaker, and / or haptic module.

[0351] For example, in the case of data communication, I / O unit 140c can acquire user input information / signals (e.g., touch, text, voice, image, or video), and the acquired information / signals can be stored in memory unit 130. Communication unit 110 can convert the information / signals stored in memory into radio signals and transmit the converted radio signals directly to other wireless devices or to the BS. Communication unit 110 can receive radio signals from other wireless devices or the BS, and then recover the received radio signals into the original information / signals. The recovered information / signals can be stored in memory unit 130 and can be output in various types (e.g., text, voice, image, video, or haptic feedback) through I / O unit 140.

[0352] Figure 23 A vehicle or autonomous vehicle according to an embodiment of this disclosure is shown. The vehicle or autonomous vehicle can be implemented by mobile robots, cars, trains, manned / unmanned aerial vehicles (AVs), ships, etc.

[0353] Reference Figure 23 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as part of the communication unit (110). Boxes 110 / 130 / 140a to 140d correspond to respectively Figure 21 The frame size is 110 / 130 / 140.

[0354] Communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BS (e.g., gNB and roadside units), and servers. Control unit 120 can perform various operations by controlling the components of the vehicle or autonomous vehicle 100. Control unit 120 may include electronic control unit (ECU). Drive unit 140a can cause the vehicle or autonomous vehicle 100 to move on the road. Drive unit 140a may include engine, motor, transmission system, wheels, brakes, steering equipment, etc. Power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and may include wired / wireless charging circuitry, batteries, etc. Sensor unit 140c can acquire vehicle status, external environment information, user information, etc. Sensor unit 140c may include inertial measurement unit (IMU) sensors, collision sensors, wheel sensors, speed sensors, slope sensors, weight sensors, heading sensors, position modules, vehicle forward / reverse sensors, battery sensors, fuel sensors, tire sensors, steering sensors, temperature sensors, humidity sensors, ultrasonic sensors, lighting sensors, pedal position sensors, etc. Autonomous driving unit 140d can implement technologies for maintaining the vehicle's lane, technologies for automatically adjusting speed (e.g., adaptive cruise control), technologies for autonomously driving along a defined path, and technologies for automatically setting a route when a destination is set, etc.

[0355] For example, communication unit 110 can receive map data, traffic information data, etc., from an external server. Autonomous driving unit 140d can generate autonomous driving paths and driving plans from the acquired data. Control unit 120 can control drive unit 140a, enabling the vehicle or autonomous vehicle 100 to move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, communication unit 110 can periodically or non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from neighboring vehicles. During autonomous driving, sensor unit 140c can acquire vehicle status and / or surrounding environment information. Autonomous driving unit 140d can update the autonomous driving path and driving plan based on newly acquired data / information. Communication unit 110 can transmit information about vehicle location, autonomous driving path, and / or driving plan to an external server. The external server can predict traffic information data using AI technology, etc., based on information collected from the vehicle or autonomous vehicle, and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0356] The claims in this specification can be combined in various ways. For example, technical features in the method claims of this specification can be combined to implement or perform in an apparatus, and technical features in the apparatus claims can be combined to implement or perform in a method. Additionally, technical features in one or more method claims and one or more apparatus claims can be combined to implement or perform in a method.

Claims

1. A method comprising: The device receives information related to multiple resource pools from the base station. as well as The device monitors multiple NR SL downlink control information (DCI) messages used for scheduling the new radio (NR) sidelink (SL). Each of the plurality of NR SL DCIs includes resource pool index information. Wherein, before at least one zero bit is appended to the plurality of MR SL DCIs, the size of the NR SL DCI is the largest among the sizes of the plurality of NR SL DCIs, and Wherein, based on configuring the plurality of resource pools for the device, the size of the plurality of NR SL DCIs to which the at least one zero bit is appended is equal to the size of the NR SL DCI.

2. The method according to claim 1, wherein, Each of the plurality of NR SL DCIs is associated with a corresponding one of the plurality of resource pools.

3. The method according to claim 1, wherein, The at least one zero bit is appended to the plurality of NR SLDCIs until the size of the plurality of NR SLDCIs is equal to the size of the NR SLDCI.

4. The method according to claim 1, further comprising: The device monitors the LTE SL DCI used for scheduling Long Term Evolution (LTE) SL.

5. The method according to claim 4, wherein, Based on the fact that the size of the LTE SL DCI before the at least one zero bit is appended is smaller than the size of the NR SL DCI, the size of the LTE SL DCI to which the at least one zero bit is appended is equal to the size of the NR SL DCI.

6. The method according to claim 5, wherein, The at least one zero bit is appended to the LTE SL DCI until the size of the LTE SL DCI is equal to the size of the NR SL DCI.

7. The method according to claim 4, wherein, Based on the fact that the size of the NRSL DCI before the at least one zero bit is appended is smaller than the size of the LTE SL DCI, the size of the plurality of NRSL DCIs to which the at least one zero bit is appended is equal to the size of the LTE SL DCI.

8. The method according to claim 7, wherein, The at least one zero bit is appended to the plurality of NR SLDCIs until the size of the plurality of NR SLDCIs is equal to the size of the LTE SLDCI.

9. The method of claim 1, further comprising: The device monitors the Uu DCI used for scheduling uplink (UL) or downlink (DL).

10. The method according to claim 9, wherein, Based on the fact that the number of different DCI sizes configured for monitoring exceeds the DCI format budget, the size of the plurality of NR SL DCIs to which the at least one zero bit is appended is equal to the size of the Uu DCI.

11. The method according to claim 10, wherein, The at least one zero bit is appended to the plurality of NR SLDCIs until the size of the plurality of NR SLDCIs is equal to the size of the Uu DCI.

12. A method comprising: The base station sends information related to multiple resource pools to the device; The base station appends at least one zero bit to multiple NRSL downlink control information (DCI) for scheduling of the new radio (NR) sidelink (SL); and The base station sends at least one NR SL DCI from the plurality of NR SL DCIs to the device. Each of the plurality of NR SL DCIs includes resource pool index information. Wherein, before at least one zero bit is appended to the plurality of MR SL DCIs, the size of the NR SL DCI is the largest among the sizes of the plurality of NR SL DCIs, and Wherein, based on configuring the plurality of resource pools for the device, the at least one zero bit is appended to the plurality of NR SL DCIs until the size of the plurality of NR SL DCIs is equal to the size of the NR SL DCI.

13. The method according to claim 12, wherein, Each of the plurality of NR SL DCIs is associated with a corresponding one of the plurality of resource pools.

14. The method of claim 12, further comprising: The base station sends an LTE SL DCI for scheduling Long Term Evolution (LTE) SL to the device.

15. The method according to claim 14, wherein, The at least one zero bit is appended to the LTESL DCI based on the fact that the size of the LTESL DCI before the at least one zero bit is appended is smaller than the size of the NRSL DCI, until the size of the LTESL DCI is equal to the size of the NRSL DCI.

16. The method of claim 14, wherein, Based on the fact that the size of the NR SL DCI before the at least one zero bit is appended is smaller than the size of the LTE SL DCI, the at least one zero bit is appended to the plurality of NR SL DCIs until the size of the plurality of NR SL DCIs is equal to the size of the LTE SL DCI.

17. An apparatus comprising: At least one transceiver; At least one processor; as well as At least one memory, connected to the at least one processor and storing instructions, which, upon execution, cause the device to perform operations including: Receive information related to multiple resource pools from the base station; as well as Monitor multiple NR SL downlink control information (DCI) for scheduling of new radio (NR) sidelinks (SL). Each of the plurality of NR SL DCIs includes resource pool index information. Wherein, before at least one zero bit is appended to the plurality of MR SL DCIs, the size of the NR SL DCI is the largest among the sizes of the plurality of NR SL DCIs, and Wherein, based on configuring the plurality of resource pools for the device, the size of the plurality of NR SL DCIs to which the at least one zero bit is appended is equal to the size of the NR SL DCI.

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