Method and apparatus for performing CSI reporting in NR V2X

Abstract

According to an embodiment of the present disclosure, a method for a first device to perform sidelink communication is provided. The method may include the following steps: receiving a CSI-RS from a second device; sending an SR or a BSR to a base station based on triggering the sending of a sidelink CSI MAC CE to the second device through channel-related information measured based on the CSI-RS; receiving an SL grant related to the SR or the BSR from the base station; and canceling the triggered sidelink CSI MAC CE sending to the second device based on a delay bound related to the sending of the sidelink CSI MAC CE and a time interval based on the SL grant sent for the sidelink CSI MAC CE.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems. Background Art

[0002] Side Link (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs directly exchange voice and data with each other without intervention of an evolved Node B (eNB). SL communication is being considered as a solution to eNB overhead caused by the rapid growth of data traffic.

[0003] V2X (Vehicle to Everything) refers to the communication technology used by vehicles to exchange information with other vehicles, pedestrians, and objects equipped with infrastructure. V2X can be divided into four types such as 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] In addition, as more and more communication devices require larger communication capacity, mobile broadband communication enhanced relative to the traditional radio access technology (RAT) is required. Therefore, the design of communication systems taking into account UEs or services that are sensitive to reliability and latency has also been discussed, and the next generation radio access technology taking into account enhanced mobile broadband communication, massive MTC, and ultra-reliable low latency communication (URLLC) can be referred to as a new RAT (radio access technology) or NR (new radio).

[0005] Figure 1 is a diagram for describing NR-based V2X communication compared to V2X communication based on RAT used before NR. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0006] Regarding V2X communication, when discussing the RAT used before NR, the focus is on the scheme of providing safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message) and DENM (Decentralized Environment Notification Message). V2X messages may include location information, dynamic information, attribute information, etc. For example, a UE may send a periodic message type CAM and / or an event-triggered message type DENM to another UE.

[0007] For example, CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as size, and basic vehicle information such as external lighting status, route details, etc. For example, UE may broadcast CAM, and the latency of CAM may be less than 100ms. For example, UE may generate DENM and send it to another UE in an unexpected situation such as vehicle failure, accident, etc. For example, all vehicles within the transmission range of UE can receive CAM and / or DENM. In this case, DENM may have a higher priority than CAM.

[0008] Since then, various V2X scenarios have been proposed in NR regarding V2X communication. For example, these various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, etc.

[0009] For example, based on the vehicle queuing, the vehicles can move together by dynamically forming a group. For example, in order to perform a queuing operation based on the vehicle queuing, the vehicles belonging to the group can receive periodic data from the leading vehicle. For example, the vehicles belonging to the group can reduce or increase the interval between the vehicles by using the periodic data.

[0010] For example, based on advanced driving, the vehicles can be semi-autonomous or fully autonomous. For example, each vehicle can adjust trajectory or maneuver based on data obtained from local sensors of nearby vehicles and / or nearby logical entities. In addition, for example, each vehicle can share driving intentions with nearby vehicles.

[0011] For example, based on the extended sensors, raw data, processed data or real-time video data obtained by local sensors can be exchanged between the vehicle, the logical entity, the pedestrian UE and / or the V2X application server, so that, for example, the vehicle can recognize a further improved environment compared to the environment detected using its own sensors.

[0012] For example, based on remote driving, for a person or remote vehicle that cannot drive in a dangerous environment, a remote driver or V2X application can operate or control the remote vehicle. For example, if the route is predictable (such as public transportation), cloud computing-based driving can be used for the operation or control of the remote vehicle. In addition, for example, access to a cloud-based backend service platform can be considered for remote driving.

[0013] In addition, schemes for specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, etc. are discussed in NR-based V2X communications. Summary of the invention

[0014] Technical Purpose

[0015] The present disclosure provides a method for performing SL communication between devices (or UEs) and a device (or UE) for performing the method.

[0016] The present disclosure provides a method for performing CSI reporting through a CSI MAC CE and an apparatus (or UE) for performing the method.

[0017] Technical Solution

[0018] Based on the embodiments of the present disclosure, a method for a first device to perform a side link (SL) communication may be provided. The method may include the following steps: receiving a channel state information (CSI)-reference signal (RS) from a second device; sending a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a side link CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on the CSI-RS; receiving a side link grant related to the SR or the BSR from the base station; and canceling the triggered side link CSI MAC CE sending of the second device based on a waiting time limit related to the side link CSI MAC CE sending and a time period based on the side link grant for the side link CSI MAC CE sending.

[0019] Based on the embodiments of the present disclosure, a first device configured to perform sidelink (SL) communication may be provided. The first device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connected to the at least one memory and the at least one transceiver. The at least one processor may execute the instructions to: receive channel state information (CSI)-reference signal (RS) from a second device; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sidelink CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on the CSI-RS; receive a sidelink grant related to the SR or the BSR from the base station; and cancel the triggered sidelink CSI MAC CE sending of the second device based on a waiting time limit related to the sending of the sidelink CSI MAC CE and a time period based on the sidelink grant for the sending of the sidelink CSI MAC CE.

[0020] Based on the embodiments of the present disclosure, a device (or chip (set)) configured to control a first user equipment (UE) may be provided. The device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. The at least one processor may execute the instructions to: receive channel state information (CSI)-reference signal (RS) from a second UE; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sidelink CSI medium access control (MAC) control element (CE) of the second UE through channel-related information measured based on the CSI-RS; receive a sidelink grant related to the SR or the BSR from the base station; and cancel the triggered sidelink CSI MAC CE sending to the second UE based on a waiting time limit related to the sidelink CSI MAC CE sending and a time period based on the sidelink grant for the sidelink CSI MAC CE sending.

[0021] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. When the instructions are executed, the first device may: receive channel state information (CSI)-reference signal (RS) from a second device; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sublink CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on the CSI-RS; receive a sublink grant related to the SR or the BSR from the base station; and cancel the triggered sublink CSI MAC CE sending of the second device based on a waiting time limit related to the sending of the sublink CSI MAC CE and a time period based on the sublink grant for the sending of the sublink CSI MAC CE.

[0022] Based on the embodiments of the present disclosure, a method for a base station to perform wireless communication can be provided. The method may include the following steps: based on the triggering of the first device to send a sublink channel state information (CSI) medium access control (MAC) control element (CE) of a second device, receiving a scheduling request (SR) or a buffer status report (BSR) from the first device; and sending a sublink grant related to the SR or the BSR to the first device, wherein the first device triggers the sending of the sublink CSI MAC CE to the second device based on the channel-related information measured based on the CSI-reference signal (RS) received by the first device from the second device, and wherein, based on the waiting time limit related to the sending of the sublink CSI MAC CE and the time period based on the sublink grant for the sending of the sublink CSI MAC CE, the first device cancels the triggered sending of the sublink CSI MAC CE to the second device.

[0023] Based on the embodiments of the present disclosure, a base station configured to perform wireless communication may be provided. The base station may include: at least one memory storing instructions; at least one transceiver; and at least one processor connected to the at least one memory and the at least one transceiver. The at least one processor may execute the instructions to: based on the triggering of the first device to send a sidelink channel state information (CSI) medium access control (MAC) control element (CE) of the second device, receive a scheduling request (SR) or a buffer status report (BSR) from the first device; and send a sidelink grant related to the SR or the BSR to the first device, wherein the first device is based on the channel-related information measured based on the CSI-reference signal (RS) received by the first device from the second device to trigger the sending of the sidelink CSI MAC CE to the second device, and wherein, based on the waiting time limit related to the sending of the sidelink CSI MAC CE and the time period based on the sidelink grant for the sending of the sidelink CSI MAC CE, the first device cancels the triggered sidelink CSI MAC CE sending of the second device.

[0024] Effects of the present disclosure

[0025] Based on the present disclosure, V2X communication between devices (UEs) can be performed efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a diagram for describing NR-based V2X communication compared to V2X communication based on RAT used before NR.

[0027] Figure 2The structure of the NR system according to an embodiment of the present disclosure is shown.

[0028] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0029] Figure 4a and Figure 4b A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0030] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0031] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0032] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0033] Figure 8a and Figure 8b A radio protocol architecture for SL communication based on an embodiment of the present disclosure is shown.

[0034] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown.

[0035] Fig.10a and Fig.10b A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication based on a transmission mode is shown.

[0036] Figures 11a to 11c Three types of broadcasts based on embodiments of the present disclosure are shown.

[0037] Fig.12 An example of multiple unicast links between two UEs is shown.

[0038] Fig.13 An example of a process in which a base station, a first device, and a second device perform side-link communication related to transmission of a side-link CSI MAC CE is shown.

[0039] Fig.14 The operation of the first device according to the embodiment of the present disclosure is shown.

[0040] Fig.15 The operation of the base station according to the embodiment of the present disclosure is shown.

[0041] Fig.16 A communication system 1 according to an embodiment of the present disclosure is shown.

[0042] Fig.17 A wireless device according to an embodiment of the present disclosure is shown.

[0043] Fig.18 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0044] Fig.19 A wireless device according to an embodiment of the present disclosure is shown.

[0045] Fig. 20 A handheld device according to an embodiment of the present disclosure is shown.

[0046] Fig.21 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0047] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

[0048] A slash ( / ) or a comma used in the present disclosure may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0049] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present 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".

[0050] In addition, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "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".

[0051] In addition, brackets used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean proposing "PDCCH" as an example of "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean proposing "PDCCH" as an example of "control information".

[0052] The technical features respectively described in a pair of drawings in the present disclosure may be implemented separately or simultaneously.

[0053] The techniques 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), single carrier frequency division multiple access (SC-FDMA), etc. 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 Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a 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.

[0054] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with high performance, low latency, high availability, etc. 5G NR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) above 24 GHz.

[0055] For the sake of clarity, the following description will mainly focus on LTE-A or 5G NR. However, the technical features of the embodiments of the present disclosure will not be limited thereto.

[0056] Figure 2 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0057] Reference Figure 2 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 may include a next generation Node B (gNB) and / or an evolved Node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0058] Figure 2 The embodiment of the present invention illustrates a case where only gNB is included. BS 20 may be connected to each other via an Xn interface. BS 20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, BS 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an NG-U interface.

[0059] Figure 3 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is shown.

[0060] Reference Figure 3 , gNB can provide functions such as inter-cell radio resource management (inter-cell RRM), radio bearer (RB) control, connection mobility control, radio admission control, measurement configuration and provision, dynamic resource allocation, etc. AMF can provide functions such as non-access stratum (NAS) security, idle state mobility processing, etc. UPF can provide functions such as mobility anchoring, protocol data unit (PDU) processing, etc. Session management function (SMF) can provide functions such as user equipment (UE) Internet protocol (IP) address allocation, PDU session control, etc.

[0061] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Here, the physical (PHY) layer belonging to the first layer provides an information transmission service using a physical channel, and the radio resource control (RRC) layer located at the third layer controls radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0062] Figure 4a and Figure 4b A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4a and Figure 4b The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4a shows the radio protocol architecture for the user plane, and Figure 4b The radio protocol architecture for the control plane is shown. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

[0063] Reference Figure 4a and Figure 4b , the physical layer provides information transfer services to the upper layer through a physical channel. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how data is sent through the radio interface and what characteristics the data has to be sent through the radio interface.

[0064] Data is transmitted through a physical channel between different PHY layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0065] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transmission services through logical channels.

[0066] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). In order to ensure different Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat Request (ARQ).

[0067] The Radio Resource Control (RRC) layer is defined only in the control plane. And, the RRC layer performs the function of controlling physical channels, transport channels, and logical channels related to configuration, reconfiguration, and release of radio bearers. RB refers to a logical path provided by the first layer (i.e., the PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, and the PDCP layer) to transmit data between the UE and the network.

[0068] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission and encryption / integrity protection of control plane data.

[0069] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0070] Configuration of RB refers to the process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RB can then be classified into two types, namely, signaling radio bearer (SRB) and data radio bearer (DRB). SRB is used as a path for sending RRC messages in the control plane, and DRB is used as a path for sending user data in the user plane.

[0071] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

[0072] The downlink transmission channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user services or control messages. The services or control messages of downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transmission channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending other user services or control messages.

[0073] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0074] The physical channel is configured by multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A subframe is configured by multiple OFDM symbols in the time domain. A resource block is configured by multiple subcarriers and multiple OFDM symbols in a resource allocation unit. In addition, each subframe can use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) of the corresponding subframe of the physical downlink control channel (PDCCH), i.e., the L1 / L2 control channel. The transmission time interval (TTI) refers to the unit time of subframe transmission.

[0075] Figure 5 The structure of the NR system according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0076] Reference Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms 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).

[0077] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0078] The following table 1 shows the number of time slots (N) of each symbol according to the SCS setting (μ) when the normal CP is adopted. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0079] [Table 1]

[0080] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 15KHz(μ=0) 14 10 1 30KHz(μ=1) 14 20 2 60KHz(μ=2) 14 40 4 120KHz(μ=3) 14 80 8 240KHz(μ=4) 14 160 16

[0081] Table 2 shows an example of the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS in the case of using the extended CP.

[0082] [Table 2]

[0083] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 60KHz(μ=2) 12 40 4

[0084] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0085] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0086] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0087] [Table 3]

[0088] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0089] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may 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 may include unlicensed frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0090] [Table 4]

[0091] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0092] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown.

[0093] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. For example, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols.

[0094] A carrier includes 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 part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0095] In addition, the radio interface between a UE and another UE or the radio interface between a UE and a network may include an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to a physical layer. In addition, for example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may refer to an RRC layer.

[0096] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0097] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0098] When bandwidth adaptation (BA) is used, the reception bandwidth and transmission bandwidth of the user equipment (UE) are not required to be as wide (or large) as the bandwidth of the cell, and the reception bandwidth and transmission bandwidth of the UE can be controlled (or adjusted). For example, the UE can receive information / configuration for bandwidth control (or adjustment) from the network / base station. In this case, bandwidth control (or adjustment) can be performed based on the received information / configuration. For example, bandwidth control (or adjustment) can include a reduction / expansion of bandwidth, a change in the position of bandwidth, or a change in the subcarrier spacing of bandwidth.

[0099] For example, the bandwidth can be reduced during a duration with little activity in order to save power. For example, the location of the bandwidth can be relocated (or moved) from the frequency domain. For example, the location of the bandwidth can be relocated (or moved) from the frequency domain to enhance scheduling flexibility. For example, the subcarrier spacing of the bandwidth can be changed. For example, the subcarrier spacing of the bandwidth can be changed to authorize different services. A subset of the total cell bandwidth of a cell can be referred to as a bandwidth part (BWP). BA can be performed when the base station / network configures a BWP for the UE and when the base station / network notifies the UE of the BWP that is currently activated among the BWPs.

[0100] For example, the BWP may be one of an activated BWP, an initial BWP, and / or a default BWP. For example, the UE cannot monitor the downlink radio link quality in a DL BWP other than an activated DL BWP within a primary cell (PCell). For example, the UE cannot receive PDCCH, PDSCH, or CSI-RS (except RRM) from outside an activated DL BWP. For example, the UE cannot trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE cannot send a PUCCH or PUSCH from outside an unactivated DL BWP. For example, in the case of a downlink, the initial BWP may be given as a continuous RB set for an RMSI CORESET (configured by the PBCH). For example, in the case of an uplink, an initial BWP may be given by the SIB for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be an initial DL BWP. In order to save energy, if the UE fails to detect DCI within a predetermined time period, the UE may switch the UE's activated BWP to a default BWP.

[0101] In addition, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can send a SL channel or a SL signal within a specific BWP, and a receiving UE can receive a SL channel or a SL signal within the same specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive a configuration for the SL BWP from the base station / network. The SL BWP can be configured (in advance) for NR V2X UEs and RRC_IDLE UEs out of coverage. For UEs operating in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0102] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Figure 7 In an implementation manner, the number of BWPs is 3.

[0103] Reference Figure 7 , a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of a resource block grid.

[0104] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A may be an external reference point of the PRBs of the carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) are aligned in point A. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth may be the number of PRBs within a given parameter set.

[0105] Hereinafter, V2X or SL communication will be described.

[0106] Figure 8a and Figure 8b A radio protocol architecture for SL communication based on an embodiment of the present disclosure is shown. Figure 8a and Figure 8b The embodiments of can be combined with various embodiments of the present disclosure. More specifically, Figure 8a shows the user plane protocol stack, and Figure 8b The control plane protocol stack is shown.

[0107] Hereinafter, a side link synchronization signal (SLSS) and synchronization information will be described.

[0108] The SLSS may include a primary sublink synchronization signal (PSSS) and a secondary sublink synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a sublink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sublink secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquiring detailed synchronization and for detecting a synchronization signal ID.

[0109] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including 24-bit CRC.

[0110] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sublink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sublink control channel (PSCCH) / physical sublink shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within the (pre) configured sublink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, the frequency position of the S-SSB may be (pre) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0111] Fig. 9 A UE performing V2X or SL communication according to an embodiment of the present disclosure is shown. Fig. 9 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0112] Reference Fig. 9In V2X or SL communication, the term "UE" may 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, the BS may also be regarded as a type of UE. For example, UE 1 may be a first device 100, and UE 2 may be a second device 200.

[0113] For example, UE 1 may select a resource unit corresponding to a specific resource in a resource pool that means a collection of a series of resources. In addition, UE 1 may send an SL signal by using the resource unit. For example, a resource pool in which UE 1 can send a signal may be configured to UE 2 as a receiving UE, and a signal of UE 1 may be detected in the resource pool.

[0114] Herein, if UE 1 is within the connection range of the BS, the BS may inform the resource pool to UE 1. Otherwise, if UE 1 is out of the connection range of the BS, another UE may inform UE 1 of the resource pool, or UE 1 may use a pre-configured resource pool.

[0115] Generally, a resource pool may consist of multiple resource units, and each UE may select one or more resource units for its SL signal transmission.

[0116] Hereinafter, resource allocation in SL will be described.

[0117] Fig.10a and Fig.10b A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication based on a transmission mode is shown. Fig.10a and Fig.10b The embodiments of the present disclosure may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a 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.

[0118] For example, Fig.10a UE operations related to LTE transmission mode 1 or LTE transmission mode 3 are shown. Alternatively, for example, Fig.10a UE operations related to NR resource allocation mode 1 are shown. For example, LTE transmission mode 1 can be applied to conventional SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0119] For example, Fig.10b UE operations related to LTE transmission mode 2 or LTE transmission mode 4 are shown. Alternatively, for example, Fig.10b UE operations associated with NR resource allocation mode 2 are shown.

[0120] Reference Fig.10a , in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS may schedule SL resources to be used by the UE for SL transmission. For example, the BS may perform resource scheduling for UE 1 through PDCCH (more specifically, downlink control information (DCI)), and UE 1 may perform V2X or SL communication for UE 2 according to the resource scheduling. For example, UE 1 may transmit sidelink control information (SCI) to UE 2 through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to UE 2 through a physical sidelink shared channel (PSSCH).

[0121] Reference Fig.10b , in 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 the pre-configured SL resources. For example, the configured SL resources or the pre-configured SL resources may be a resource pool. For example, the UE may autonomously select or schedule resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting resources in the configured resource pool. For example, the UE may autonomously select resources within a selection window by performing a sensing and resource (re)selection process. For example, sensing may be performed in units of subchannels. In addition, UE 1, which has autonomously selected resources within the resource pool, may send SCI to UE 2 via PSCCH, and may thereafter send data based on the SCI to UE 2 via PSSCH.

[0122] Figures 11a to 11c Three types of broadcasts based on embodiments of the present disclosure are shown. Figures 11a to 11c The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig.11a shows a broadcast type SL communication, Fig.11b shows a unicast type SL communication, and Fig.11c A multicast type SL communication is shown. In the case of a unicast type SL communication, the UE can perform one-to-one communication with another UE. In the case of a multicast type SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, the SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, and the like.

[0123] In addition, in SL communication, the UE needs to efficiently select resources for SL transmission. Hereinafter, based on various embodiments of the present disclosure, a method for the UE to efficiently select resources for SL transmission and a device supporting the method will be described. In various embodiments of the present disclosure, SL communication may include V2X communication.

[0124] At least one of the methods proposed in various embodiments of the present disclosure may be applied to at least one of unicast communication, multicast communication and / or broadcast communication.

[0125] At least one of the methods proposed based on various embodiments of the present disclosure can be applied not only to SL communication or V2X communication based on PC5 interface or SL interface (for example, PSCCH, PSSCH, PSBCH, PSSS / SSSS, etc.), but also to SL communication or V2X communication based on Uu interface (for example, PUSCH, PDSCH, PDCCH, PUCCH, etc.).

[0126] In various embodiments of the present disclosure, the receiving operation of the UE may include a decoding operation and / or a receiving operation of a SL channel and / or a SL signal (e.g., PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.). The receiving operation of the UE may include a decoding operation and / or a receiving operation of a WAN DL channel and / or a WAN DL signal (e.g., PDCCH, PDSCH, PSS / SSS, etc.). The receiving operation of the UE may include a sensing operation and / or a channel busy ratio (CBR) measurement operation. In various embodiments of the present disclosure, the sensing operation of the UE may include a PSSCH-RSRP measurement operation based on a PSSCH DM-RS sequence, a PSSCH-RSRP measurement operation based on a PSSCH DM-RS sequence successfully decoded by the UE and scheduled by the PSCCH, a side link RSSI (S-RSSI) measurement operation, and / or an S-RSSI measurement operation based on a subchannel related to a V2X resource pool. In various embodiments of the present disclosure, the transmission operation of the UE may include the transmission operation of the SL channel and / or the SL signal (e.g., PSCCH, PSSCH, PSFCH, PSBCH, PSSS / SSSS, etc.). The transmission operation may include the transmission operation of the WAN UL channel and / or the WAN UL signal (e.g., PUSCH, PUCCH, SRS, etc.). In various embodiments of the present disclosure, the synchronization signal may include SLSS and / or PSBCH.

[0127] In various embodiments of the present disclosure, configuration may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network. In various embodiments of the present disclosure, definition may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network. In various embodiments of the present disclosure, specification may include signaling, signaling from the network, configuration from the network, and / or pre-configuration from the network.

[0128] In various embodiments of the present disclosure, the ProSe per-packet priority (PPPP) may be replaced by the ProSe per-packet reliability (PPPR), and the PPPR may be replaced by the PPPP. For example, when the PPPP value becomes smaller, this may indicate a high priority, and when the PPPP value becomes larger, this may indicate a low priority. For example, when the PPPR value becomes smaller, this may indicate a high reliability, and when the PPPR value becomes larger, this may indicate a low reliability. For example, the PPPP value associated with a service, packet, or message associated with a high priority may be smaller than the PPPP value associated with a service, packet, or message associated with a low priority. For example, the PPPR value associated with a service, packet, or message associated with a high reliability may be smaller than the PPPR value associated with a service, packet, or message associated with a low reliability.

[0129] In various embodiments of the present disclosure, a session may include at least one of a unicast session (e.g., a unicast session for SL), a groupcast / multicast session (e.g., a multicast / multicast session for SL), and / or a broadcast session (e.g., a broadcast session for SL).

[0130] In various embodiments of the present disclosure, a carrier may be replaced with at least one of a BWP and / or a resource pool, or vice versa. For example, a carrier may include at least one of a BWP and / or a resource pool. For example, a carrier may include one or more BWPs. For example, a BWP may include one or more resource pools.

[0131] In addition, the NR secondary link supports CSI measurement / reporting between two UEs, and CSI measurement / reporting can be used for link adaptation between the two UEs. For example, UE2, which has received CSI-RS from UE1, can appropriately adjust the modulation and coding scheme (MCS) or select an appropriate precoding matrix by using the channel state estimated based on CSI-RS (e.g., a value related to the channel state).

[0132] In addition, to support CSI measurement / reporting in the NR side link, a protocol as shown in Table 5 was derived for side link CSI reporting in a recent 3GPP RAN2 meeting.

[0133] [Table 5]

[0134]

[0135]

[0136] Referring to Table 5, in the side link communication, the UE may report the SL CSI to another UE via the MAC CE. That is, in the communication between the base station and the UE, the UE reports the CSI to the base station via L1 signaling (e.g., physical layer signaling), and in the side link communication, the UE may report the SL CSI to another UE via the MAC CE. Accordingly, if the SL MAC CE is defined together with a new logical channel ID (LCID), and if there are no appropriate resources for sending the SL MAC CE, the UE may trigger mode 1 resource scheduling (e.g., sending an SR to the base station), or the UE may perform mode 2 resource scheduling (e.g., sensing-based resource selection). For the convenience of description, the CSI sent / reported via the MAC CE may be referred to as a CSI MAC CE, a side link CSI MAC CE, or an SLCSI. In addition, considering the situations related to the UE's transmission (e.g., prioritization, congestion control, etc.), the CSI MAC CE should be sent within the UE's transmission waiting time limit. For example, assume that the packet delay budget (PDB) of the packet to be sent by the UE is 100ms. In this case, the UE should send the CSI MAC CE within at least 100ms. However, the waiting time limit of 100ms is only the waiting time limit for the transmission of data to be sent by the UE, and the UE may have to send the CSI MAC CE faster than 100ms. For example, the UE may have to send the CSI MAC CE within a waiting time limit of about 3ms to 20ms.

[0137] Hereinafter, based on various embodiments of the present disclosure, a method for sending CSI MAC CE and a device supporting the method are proposed. The various embodiments proposed below can be applied to side link unicast communication. For the convenience of description, although unicast communication is mainly described, the various embodiments proposed below can be applied to other broadcast types (e.g., multicast or broadcast). For example, if a PC5-RRC connection between UEs is established in multicast or broadcast, CSI reporting can be performed between UEs. Accordingly, the various embodiments proposed below can be applied not only to unicast communication, but also to other broadcast type communications.

[0138] As described above, the PDB of the SL CSI may have to have a value less than or equal to the PDB of the data. More specifically, the PDB of the SLCSI may be less than or equal to the PDB of the data to be guaranteed for the service between the two UEs. Herein, the PDB of the data may refer to a specific parameter (e.g., packet delay budget) among the QoS information (e.g., standardized PQI information) used for communication between the two UEs in unicast communication. For example, the following Table 6 may show the mapping between the standardized PQI and QoS characteristics for the side link service. For details related to Table 6, refer to 3GPP TS23.287V16.1.0.

[0139] [Table 6]

[0140]

[0141]

[0142]

[0143] For example, referring to Table 6, a PQI value of 1 supports queuing services and should meet requirements such as priority level 3, PDB 20ms, and packet error rate (PER) 10. -4 Such QoS characteristics. The QoS characteristics may be mapped to each radio bearer (RB). For example, if the PQI value associated with a specific radio bearer (RB) is 1, data transmitted / received on the specific RB should be transmitted / received to satisfy the QoS characteristics corresponding to the PQI value 1 of Table 6.

[0144] However, the PDB of the SL CSI may be independent and may have a value less than or equal to the PDB indicated by the PQI value. For example, assuming that the PQI value mapped to the RB is 3, the PDB mapped to the PQI value 3 may be 100ms. However, if UE1 sends the SL CSI to UE2 within 100ms of the PDB as data, the accuracy of the channel estimation of UE2 based on the SL CSI may deteriorate. Therefore, even if the PDB of the data is 100ms, UE1 may have to send the SL CSI to UE2 within an earlier delay budget.

[0145] On the other hand, in the case of PDB of SL CSI, the UE may follow the PDB indicated by the LCH (or RB) associated with the data. In this case, if a MAC PDU is generated from multiple LCHs (or RBs), the PDB of CSI may follow the minimum PDB value among them. For example, if a MAC PDU is generated from two LCHs and a CSI MAC CE is multiplexed into the MAC PDU, the PDB of the CSI MAC CE follows the minimum PDB value among the two LCHs.

[0146] As described above, in the secondary link communication, both UEs can perform unicast communication. Herein, in unicast communication, the path between UEs for sending and receiving a specific service can be referred to as a session. For example, establishing a session between two UEs means that the PC5-RRC connection between the two UEs is successfully established, and the two UEs can send and receive RRC information through the PC5-RRC connection.

[0147] In addition, in order to enable two UEs to send and receive multiple services in unicast communication, multiple unicast sessions can be established between the two UEs. Then, the two UEs can send and receive PC5-RRC configurations for each session, and the two UEs can configure each session. In this case, each session can have different QoS characteristics.

[0148] Fig.12 An example of multiple unicast links between two UEs is shown.

[0149] Reference Fig.12 , two UEs can establish three sessions to send and receive three services. For example, PC5-RRC connection A, PC5-RRC connection B and PC5-RRC connection C can be established between UE1 and UE2.

[0150] For example, UE1 and UE2 may exchange information such as RRC configuration, AS configuration, UE capabilities, etc. through each PC5-RRC connection. In addition, UE1 and UE2 may exchange different QoS information to be supported for each service. Fig.12 In an implementation manner, if link A and link B have different QoS characteristics, the PDB associated with link A and the PDB associated with link B may be different from each other. In this case, the UE may have to determine the PDB of the SL CSI.

[0151] For example, the PDB of the SL CSI may be configured as a fixed value for the UE. For example, if the PDB of the SL CSI has a fixed value, the UE may determine the PDB of the SL CSI regardless of the PDB of each link. In addition, the UE may perform resource occupation based on the PDB of the SL CSI. In addition, the UE may send the SL CSI by using occupied resources.

[0152] For example, the PDB of the SL CSI may be configured for the UE as a value related to the PDB of each link. For example, if the PDB of the SLCSI is related to the PDB of each link, the UE may determine the minimum value among the PDBs of multiple links as the PDB of the SL CSI. For example, if the PDB of the SL CSI is related to the PDB of each link, the UE may determine the value less than the minimum value among the PDBs of multiple links as the PDB of the SL CSI.

[0153] For example, in Fig.12 In the implementation of, it is assumed that the PDB of link A is 50ms and the PDB of link B is 100ms. In this case, the PDB of the SL CSI to be exchanged between UE1 and UE2 may have a value less than or equal to 50ms. In this way, the PDB of the SL CSI may be related to the PQI mapped to each link or each RB. Considering the PQI of the service to be sent, the UE may determine the PDB of the SL CSI to be a value less than or equal to the PDB related to the PQI. In addition, the UE may perform resource occupation based on the determined PDB of the SL CSI. In addition, the UE may send the SL CSI by using occupied resources.

[0154] Specifically, for example, the UE can perform resource occupation by using the selected PDB of SL CSI. For example, if the PDB of SL CSI has a smaller value than the PDB of data, the UE operating based on resource allocation mode 2 can set a resource selection window with a shorter waiting time based on the minimum PDB among the PDB of data and the PDB of SL CSI, and the UE can select resources related to the sidelink communication within the resource selection window. For example, in the case of a UE operating based on resource allocation mode 1, the UE can send QoS information to the base station through sidelink UE information (sidelink UE information). In this case, if the PDB of SL CSI is set to be shorter than the PDB of data, the UE should additionally send information about the PDB of SL CSI to the base station. To this end, for example, the UE can additionally send the PDB of SL CSI to the base station. Alternatively, the UE can additionally send the minimum PDB for QoS information of data sent to the base station and the offset value between the PDB of SL CSI. Then, taking into account the QoS information received from the UE, the base station can perform appropriate mode 1 resource allocation for the UE.

[0155] In terms of resource occupation, more specifically, the UE may have to perform resource occupation or be allocated resources by considering the PDB of the PQI associated with the data accumulated in each logical channel (LCH). For example, in the case of resource allocation mode 2, the UE can set a resource selection window suitable for the PDB and select resources within the resource selection window. In this case, if the UE generates a MAC PDU from multiple LCHs, the PDB of the MAC PDU can be the minimum PDB value among the PDBs associated with each LCH. Herein, for example, if data from LCH1 (e.g., SDU1) and data from LCH2 (e.g., SDU2) are multiplexed, the minimum PDB value can be the minimum value among the PDB values ​​associated with each LCH. For example, if data from LCH1 (e.g., SDU1) and MAC CE (e.g., CSI MAC CE) are multiplexed, the minimum PDB value can be the minimum value among the PDB value associated with LCH1 and the PDB value associated with MAC CE. For example, if MAC CE1 and MAC CE2 are multiplexed, the minimum PDB value may be the minimum value among the PDB values ​​associated with each MAC CE.

[0156] In addition, due to radio characteristics, the high frequency band has severe channel variations. That is, compared with the low frequency band, the high frequency band has extreme channel frequency selection characteristics. Therefore, since the high frequency band has more channel variations than the low frequency band, the side link UE that sends / receives side link related services in the high frequency band should send SL CSI reports relatively quickly. Therefore, in the case of the high frequency band, a PDB value of SL CSI that is smaller than that of the low frequency band may have to be applied. For example, beam transmission and reception such as millimeter waves can be performed in the side link high frequency band. In this case, the TX UE and the RX UE may need a beam management process to align their beams with each other. In this case, if the CSI-RS is configured for the UE, the UE can perform channel measurement and reporting by using the configured CSI-RS.

[0157] Therefore, based on the embodiments of the present disclosure, the PDB of the SL CSI may be different for each carrier. For example, if the PDB of the CSI MAC CE is fixedly determined, the PDB value of the SL CSI may be configured for each carrier range. For example, the PDB of the SL CSI configured for a carrier in a high frequency range may be smaller than the PDB of the SL CSI configured for a carrier in a low frequency range. For example, if the PDB of the CSI MAC CE is related to the QoS mapped to the data or RB, the UE performing SL communication in the high frequency band may set or determine the PDB of the CSI MAC CE to a value that is a specific offset smaller than the PDB mapped to the data or RB.

[0158] Fig.13 An example of a process in which a base station, a first device, and a second device perform side-link communication related to transmission of a side-link CSI MAC CE is shown.

[0159] For example, by triggering a CSI report, the UE may generate a message for sending a sidelink CSI MAC CE. For example, an upper layer (e.g., a MAC layer) of the UE may generate a message for sending a sidelink CSI MAC CE. In this case, if there is no SL grant for sending a sidelink CSI MAC CE, the UE may trigger resource allocation. For example, in the case of a UE operating based on mode 1, the UE may trigger and send a scheduling request (SR) and / or a buffer status report (BSR) in order to be allocated new resources from the base station. The base station may then send a SL grant to the UE. In addition, if the UE is unable to receive a SL grant from the base station, the UE may cancel the triggered sidelink CSI MAC CE. Herein, for example, the UE being unable to receive a SL grant may include the UE receiving a SL grant from the base station that cannot satisfy the minimum PDB determined for the sidelink MAC PDU or the PDB of the sidelink CSI MAC CE. That is, even if the UE receives a SL grant from the base station, if the UE determines / decides that the transmission of data or sublink CSI MAC CE based on the allocated SL grant exceeds the PDB in consideration of the PDB, the UE may cancel the pending data or pending sublink CSI MAC CE. For example, in this case, the UE may not send data or sublink CSI MAC CE. As described above, the reason why the UE cancels the transmission of the sublink CSI MAC CE is that even if the CSI information is sent at the next transmission opportunity, the latest CSI information that should be sent quickly is not guaranteed.

[0160] Alternatively, for example, in the case where a UE performing sensing-based resource selection under Mode 2 operation selects resources for transmission of a sublink CSI MAC CE based on sensing, if the resources overlap with resources used by another UE and / or another UE occupies resources with a higher priority, and / or the SL-RSRP value is above a certain threshold, the UE may cancel the selected resources. If the UE cancels the resources and reselects new resources, the PDB of the data or sublink CSI MAC CE previously intended to be transmitted may be exceeded. In this case, the UE may cancel the pending data or pending sublink CSI MAC CE.

[0161] Fig.13An example of a process in which a base station, a first device, and a second device according to an embodiment perform sidelink communication related to the transmission of a sidelink CSI MAC CE based on the above example is shown. In step S1310, the first device according to the embodiment may receive a channel state information-reference signal (CSI-RS) from the second device. In step S1320, the first device according to the embodiment may measure channel-related information based on the CSI-RS. In step S1330, the first device according to the embodiment may send a scheduling request (SR) or a buffer status report (BSR) to the base station based on the triggering of the transmission of a sidelink CSI medium access control (MAC) control element (CE) of the second device by the channel-related information measured based on the CSI-RS. In step S1340, the first device according to the embodiment may receive a SL grant related to the SR or BSR from the base station. In step S1350, the first device according to the embodiment may cancel the triggered sidelink CSI MAC CE transmission of the second device based on the waiting time limit related to the transmission of the sidelink CSI MAC CE and the time period based on the SL grant for the transmission of the sidelink CSI MAC CE.

[0162] Fig.14 The operation of the first device according to the embodiment of the present disclosure is shown.

[0163] It can be implemented in combination with various embodiments of the present disclosure. Fig.14 For example, based on Figures 16 to 21 At least one of the devices illustrated in the example is performed Fig.14 The operations disclosed in the flowchart are as follows. For example, Fig.14 The first device in the embodiment may be the one described later. Fig.17 In another example, Fig.14 The first device in the embodiment may be the one described later. Fig.17 The second wireless device 200 in.

[0164] In step S1410, the first device according to the embodiment may receive a channel state information (CSI)-reference signal (RS) from the second device.

[0165] In step S1420, the first device according to an embodiment may send a scheduling request (SR) or a buffer status report (BSR) to the base station based on a trigger sent by a sublink CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on CSI-RS.

[0166] For example, sending the SR or BSR to the base station may include: sending the SR to the base station; receiving an uplink grant of a BSR related to the SR from the base station; and sending the BSR to the base station based on resources informed by the uplink.

[0167] In step S1430, the first device according to the embodiment may receive a secondary link grant related to the SR or BSR from the base station.

[0168] In step S1440, the first device according to the embodiment may cancel the triggered secondary link CSI MAC CE transmission of the second device based on the waiting time limit related to the secondary link CSI MAC CE transmission and the time period based on the secondary link grant for the secondary link CSI MAC CE transmission.

[0169] For example, latency bound may be replaced with latency requirement, delay, latency, packet delay budget (PDB), etc.

[0170] For example, based on the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device may be canceled.

[0171] For example, based on the start time of the time period based on the secondary link grant for secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device may be canceled.

[0172] For example, based on the end time of the time period based on the secondary link grant for secondary link CSI MAC CE transmission being after the expiration of the waiting time limit related to the secondary link CSI MAC CE transmission, the triggered secondary link CSI MAC CE transmission of the second device can be canceled.

[0173] For example, the latency bound associated with the secondary link CSI MAC CE transmission may be less than or equal to the minimum latency bound of the secondary link MAC protocol data unit (PDU).

[0174] For example, canceling the triggered secondary link CSI MAC CE transmission to the second device may include clearing the secondary link CSI MAC CE in a buffer of the first device before transmitting the secondary link CSI MAC CE to the second device.

[0175] For example, a first unicast connection and a second unicast connection may be established between the first device and the second device. The waiting time limit associated with the transmission of the secondary link CSI MAC CE may be determined as the minimum of the first unicast waiting time limit associated with the first unicast connection and the second unicast waiting time limit associated with the second unicast connection. In this case, the first unicast waiting time limit may be different from the second unicast waiting time limit.

[0176] For example, based on the establishment of the first unicast connection between the first device and the second device, the third unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In addition, based on the establishment of the second unicast connection between the first device and the second device, the fourth unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In addition, based on the establishment of the first unicast connection and the second unicast connection between the first device and the second device, the fifth unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In this case, the third unicast waiting time limit, the fourth unicast waiting time limit, and the fifth unicast waiting time limit can be the same.

[0177] Based on the embodiments of the present disclosure, a first device configured to perform sidelink communication may be provided. The first device may include: at least one memory storing instructions; at least one transceiver; and at least one processor connected to the at least one memory and the at least one transceiver. The at least one processor may execute the instructions to: receive channel state information (CSI)-reference signal (RS) from a second device; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sidelink CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on the CSI-RS; receive a sidelink grant related to the SR or the BSR from the base station; and cancel the triggered sidelink CSI MAC CE sending of the second device based on a waiting time limit related to the sidelink CSI MAC CE sending and a time period based on the sidelink grant for the sidelink CSI MAC CE sending.

[0178] Based on the embodiments of the present disclosure, a device (or chip (set)) configured to control a first user equipment (UE) may be provided. The device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. The at least one processor may execute the instructions to: receive channel state information (CSI)-reference signal (RS) from a second UE; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sidelink CSI medium access control (MAC) control element (CE) of the second UE through channel-related information measured based on the CSI-RS; receive a sidelink grant related to the SR or the BSR from the base station; and cancel the sidelink CSI MAC CE sending to the second UE based on a waiting time limit related to the sidelink CSI MAC CE sending and a time period based on the sidelink grant for the sidelink CSI MAC CE sending.

[0179] For example, the first UE of this embodiment may refer to the first device described in the present disclosure. For example, each of at least one processor and at least one memory in a device configured to control the first UE may be implemented as a separate sub-chip, or at least two or more components may be implemented by one sub-chip.

[0180] Based on the embodiments of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. When the instructions are executed, the first device may: receive channel state information (CSI)-reference signal (RS) from a second device; send a scheduling request (SR) or a buffer status report (BSR) to a base station based on a trigger of sending a sublink CSI medium access control (MAC) control element (CE) of the second device through channel-related information measured based on the CSI-RS; receive a sublink grant related to the SR or the BSR from the base station; and cancel the triggered sublink CSI MAC CE sending of the second device based on a waiting time limit related to the sending of the sublink CSI MAC CE and a time period based on the sublink grant for the sending of the sublink CSI MAC CE.

[0181] Fig.15 The operation of the second device according to the embodiment of the present disclosure is shown.

[0182] It can be implemented in combination with various embodiments of the present disclosure. Fig.15 For example, based on Figures 16 to 21 At least one of the devices illustrated in the example is performed Fig.15 The operations disclosed in the flowchart are as follows. For example, Fig.15 The second device in the embodiment may be a device described later. Fig.17 In another example, Fig.15 The second device in the embodiment may be a device described later. Fig.17 A first wireless device 100 in.

[0183] In step S1510, according to an embodiment, the base station can receive a scheduling request (SR) or a buffer status report (BSR) from the first device based on the trigger of the first device sending a sublink channel state information (CSI) medium access control (MAC) control element (CE) to the second device.

[0184] In step S1520, the base station according to the embodiment may send a secondary link grant related to the SR or BSR to the first device.

[0185] For example, the first device may trigger the transmission of a secondary link CSI MAC CE to the second device based on channel-related information measured based on a CSI-reference signal (RS) received by the first device from the second device, and

[0186] For example, based on the waiting time limit associated with the secondary link CSI MAC CE transmission and based on the time period of the secondary link grant for the secondary link CSI MAC CE transmission, the first device may cancel the triggered secondary link CSI MAC CE transmission of the second device.

[0187] For example, based on the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device may be canceled.

[0188] For example, based on the start time of the time period based on the secondary link grant for secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device may be canceled.

[0189] For example, based on the end time of the time period based on the secondary link grant for secondary link CSI MAC CE transmission being after the expiration of the waiting time limit related to the secondary link CSI MAC CE transmission, the triggered secondary link CSI MAC CE transmission of the second device can be canceled.

[0190] For example, the latency bound associated with the secondary link CSI MAC CE transmission may be less than or equal to the minimum latency bound of the secondary link MAC protocol data unit (PDU).

[0191] For example, canceling the triggered secondary link CSI MAC CE transmission to the second device may include: flushing the secondary link CSI MAC CE in a buffer of the first device before transmitting the secondary link CSI MAC CE to the second device.

[0192] For example, a first unicast connection and a second unicast connection may be established between the first device and the second device. The waiting time limit associated with the transmission of the secondary link CSI MAC CE may be determined as the minimum of the first unicast waiting time limit associated with the first unicast connection and the second unicast waiting time limit associated with the second unicast connection. In this case, the first unicast waiting time limit may be different from the second unicast waiting time limit.

[0193] For example, based on the establishment of the first unicast connection between the first device and the second device, the third unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In addition, based on the establishment of the second unicast connection between the first device and the second device, the fourth unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In addition, based on the establishment of the first unicast connection and the second unicast connection between the first device and the second device, the fifth unicast waiting time limit can be set as the waiting time limit for sending the sublink CSI MAC CE. In this case, the third unicast waiting time limit, the fourth unicast waiting time limit, and the fifth unicast waiting time limit can be the same.

[0194] Based on the embodiments of the present disclosure, a base station configured to perform wireless communication may be provided. The base station may include: at least one memory storing instructions; at least one transceiver; and at least one processor connected to the at least one memory and the at least one transceiver. The at least one processor may execute the instructions to: based on the triggering of the first device to send a sidelink channel state information (CSI) medium access control (MAC) control element (CE) of the second device, receive a scheduling request (SR) or a buffer status report (BSR) from the first device; and send a sidelink grant related to the SR or the BSR to the first device, wherein the first device is based on the channel-related information measured based on the CSI-reference signal (RS) received by the first device from the second device to trigger the sending of the sidelink CSI MAC CE to the second device, and wherein, based on the waiting time limit related to the sending of the sidelink CSI MAC CE and the time period of the sidelink grant based on the sending of the sidelink CSI MAC CE, the first device cancels the triggered sending of the sidelink CSI MAC CE to the second device.

[0195] Various embodiments of the present disclosure may be implemented independently. Alternatively, various embodiments of the present disclosure may be implemented by combination or merging. For example, although various embodiments of the present disclosure have been described based on the 3GPP LTE system for convenience of explanation, various embodiments of the present disclosure may also be applied extensively to another system other than the 3GPP LTE system. For example, various embodiments of the present disclosure may also be used in the case of uplink or downlink, and are not limited to direct communication between UEs. In this case, a base station, a relay node, etc. may use the proposed method according to various embodiments of the present disclosure. For example, it may be defined as reporting by a base station to a UE or by a sending UE to a receiving UE via predefined signaling (e.g., physical layer signaling or higher layer signaling) or reporting by a sending UE to a receiving UE information about whether the method according to various embodiments of the present disclosure is applied. For example, it may be defined as reporting by a base station to a UE or by a sending UE to a receiving UE information about rules according to various embodiments of the present disclosure via predefined signaling (e.g., physical layer signaling or higher layer signaling). For example, some of the various embodiments of the present disclosure may only be restrictedly applied to resource allocation mode 1. For example, some of the various embodiments of the present disclosure may only be restrictedly applied to resource allocation mode 2.

[0196] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0197] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0198] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0199] Fig.16 A communication system (1) according to an embodiment of the present disclosure is shown.

[0200] Reference Fig.16, a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, 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. The wireless device may include, but is not limited to, a robot (100a), a vehicle (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device (100d), a home appliance (100e), an Internet of Things (IoT) device (100f), and an artificial intelligence (AI) device / server (400). For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMD), head up displays (HUD) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0201] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0202] Wireless communication / connection 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 through 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, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping), and at least a portion of the resource allocation process can be performed based on various proposals of the present disclosure.

[0203] Fig.17 A wireless device according to an embodiment of the present disclosure is shown.

[0204] Reference Fig.17 , the first wireless device (100) and the second wireless device (200) may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Fig.16 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0205] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including a second information / signal through the transceiver 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, (one or more) memories 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 102 or for executing 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 a RAT (e.g., LTE or NR). (One or more) transceivers 106 may be connected to (one or more) processors 102 and send and / or receive radio signals through (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 the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0206] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including a fourth information / signal through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, (one or more) memories 204 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing 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 a 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 through (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 the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0207] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, 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 description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow 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 description, function, process, proposal, method, and / or operation flow disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 can receive signals (e.g., baseband signals) from one or more transceivers 106 and 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document.

[0208] 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 the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute 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.

[0209] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and may store various types of data, signals, messages, information, programs, codes, instructions, and / or 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 drive, registers, cash memory, computer-readable storage media, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside 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.

[0210] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow 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 description, function, process, proposal, method, and / or operation flow 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 send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so 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 send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flows 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 to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0211] Fig.18 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0212] Reference Fig.18 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.18 Operation / function, not limited to Fig.17 The processor (102, 202) and / or transceiver (106, 206) of Fig.17The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.18 For example, you can Fig.17 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.17 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.17 The transceiver (106, 206) is used to implement box 1060.

[0213] Can be through Fig.18 The signal processing circuit (1000) converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0214] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated into a modulation symbol sequence by the 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 the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with the N*M precoding matrix W. 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 the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0215] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The 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. The signal generator 1060 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the 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.

[0216] Can be used with Fig.18 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. Fig.17 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a downconverter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0217] Fig.19 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (see Fig.16 ).

[0218] Reference Fig.19 , the wireless device (100, 200) may correspond to Fig.17 The wireless device (100, 200) may be configured by 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 storage 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 Fig.17 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) (114) may include Fig.17The control unit (120) is electrically connected to the communication unit (110), the memory (130) and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit (130). The control unit (120) can send the information stored in the storage unit (130) to the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit (110) through a wireless / wired interface in the storage unit (130).

[0219] The additional component (140) may be configured in various ways depending on the type of the wireless device. For example, the additional 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 may be implemented in the following forms without limitation: a robot ( Fig.16 100a), vehicles ( Fig.16 100b-1 and 100b-2), XR devices ( Fig.16 100c), handheld device ( Fig.16 100d), household appliances ( Fig.16 100e), IoT devices ( Fig.16 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.16 400), BS( Fig.16 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0220] exist Fig.19In the wireless device (100, 200), various elements, components, units / parts and / or modules in the wireless device (100, 200) can all be connected to each other through a wired interface, or at least part of them can be connected wirelessly through the 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 by wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory ( 130 ) may be constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0221] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.19 .

[0222] Fig. 20 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

[0223] Reference Fig. 20 The handheld device (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a storage 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 a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to Fig.19 Frame 110 to 130 / 140.

[0224] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The storage unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The storage unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0225] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the storage unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the storage unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0226] Fig.21 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0227] Reference Fig.21 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 a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to Fig.19 Frame 110 / 130 / 140.

[0228] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path when a destination is set, and the like.

[0229] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0230] The scope of the present disclosure may be indicated by the appended claims, and it should be understood that all variations or modifications derived from the meaning and scope of the claims and their equivalents may be included in the scope of the present disclosure.

[0231] The claims in this specification may be combined in various ways. For example, the technical features in the method claims of this specification may be combined to be implemented or performed in a device, and the technical features in the device claims may be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims may be combined to be implemented or performed in a method.

Claims

1. A method for performing secondary link communication by a first device, the method comprising the following steps: receiving information about a waiting time limit associated with sending a secondary link channel state information CSI medium access control MAC control element CE from a second device, wherein each waiting time limit is maintained for each PC5 radio resource control RRC connection; receiving a channel state information reference signal CSI-RS from the second device; sending a scheduling request SR to a base station based on (i) triggering the secondary link CSI MAC CE transmission of the second device and (ii) no secondary link grant for the secondary link CSI MAC CE transmission, Wherein, a secondary link CSIMAC CE including channel related information is obtained based on the CSI-RS; receiving a secondary link grant associated with the SR from the base station; and Based on the secondary link grant failing to satisfy the wait time limit associated with the secondary link CSI MAC CE transmission, cancelling the triggered secondary link CSI MAC CE transmission to the second device.

2. The method according to claim 1, wherein: Based on the start time of the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device is cancelled.

3. The method according to claim 1, wherein: Based on the end time of the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device is cancelled.

4. The method according to claim 1, wherein: The waiting time limit associated with the secondary link CSI MAC CE transmission is less than or equal to a minimum waiting time limit of a secondary link MAC protocol data unit PDU.

5. The method according to claim 1, wherein: Canceling the triggered sending of the secondary link CSI MAC CE to the second device includes clearing the secondary link CSI MAC CE in a buffer of the first device before sending the secondary link CSI MAC CE to the second device.

6. The method according to claim 1, wherein: Sending the SR to the base station includes: sending the SR to the base station; and receiving an uplink grant related to the SR from the base station.

7. A first device configured to perform secondary link communication, the first device comprising: at least one transceiver; at least one processor; as well as At least one memory, the at least one memory is connected to the at least one processor and stores instructions, the instructions, upon being executed, causing the first device to perform operations including: receiving information about a waiting time limit associated with sending a secondary link channel state information CSI medium access control MAC control element CE from a second device, wherein each waiting time limit is maintained for each PC5 radio resource control RRC connection; receiving a channel state information reference signal CSI-RS from the second device; sending a scheduling request SR to a base station based on (i) triggering the secondary link CSI MAC CE transmission of the second device and (ii) no secondary link grant for the secondary link CSI MAC CE transmission, Wherein, a secondary link CSIMAC CE including channel related information is obtained based on the CSI-RS; receiving a secondary link grant associated with the SR from the base station; and Based on the secondary link grant failing to satisfy the wait time limit associated with the secondary link CSI MAC CE transmission, cancelling the triggered secondary link CSI MAC CE transmission to the second device.

8. The first device according to claim 7, wherein: Based on the start time of the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device is cancelled.

9. An apparatus configured to control a first device, the apparatus comprising: at least one processor; as well as At least one memory, the at least one memory is connected to the at least one processor and stores instructions, the instructions, upon being executed, causing the first device to perform operations including: receiving information about a waiting time limit associated with sending a secondary link channel state information CSI medium access control MAC control element CE from a second device, wherein each waiting time limit is maintained for each PC5 radio resource control RRC connection; receiving a channel state information reference signal CSI-RS from the second device; sending a scheduling request SR to a base station based on (i) triggering the secondary link CSI MAC CE transmission of the second device and (ii) no secondary link grant for the secondary link CSI MAC CE transmission, Wherein, a secondary link CSIMAC CE including channel related information is obtained based on the CSI-RS; receiving a secondary link grant associated with the SR from the base station; and Based on the secondary link grant failing to satisfy the wait time limit associated with the secondary link CSI MAC CE transmission, cancelling the triggered secondary link CSI MAC CE transmission to the second device.

10. The device according to claim 9, wherein: Based on the start time of the time period based on the secondary link grant for the secondary link CSI MAC CE transmission being after the time when the waiting time limit related to the secondary link CSI MAC CE transmission expires, the triggered secondary link CSI MAC CE transmission of the second device is cancelled.

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