Method and apparatus for performing DRX operation according to power saving mode in NR V2X

Abstract

An operating method for a first device 100 in a wireless communication system is proposed. The method may include the steps of establishing a sidelink (SL) unicast link with a second device 200, transmitting first SL discontinuous reception (DRX) configuration information related to the SL unicast link to the second device 200, transmitting a physical sidelink control channel (PSCCH) to the second device 200 during an on-duration interval included in the first SL DRX configuration information, and transmitting a physical sidelink shared channel (PSSCH) to the second device 200 based on the PSCCH during the on-duration interval.

Description

[Technical field]

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

[0002] Sidelink (SL) refers to a communication method in which a direct link is established between terminals (User Equipment, UE) and voice or data is directly exchanged between terminals without going through a base station (BS). SL is considered as one solution that can solve the burden on base stations due to the rapidly increasing data traffic. V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, infrastructure objects, etc. through wired / wireless communication. V2X can be classified 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 a PC5 interface and / or a Uu interface.

[0003] Meanwhile, as more and more communication devices require larger communication capacity, the need for improved mobile broadband communication compared to existing Radio Access Technology (RAT) is emerging. As a result, communication systems that take into account reliability and latency-sensitive services or terminals are being discussed, and next-generation wireless access technologies that take into account improved mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), etc. can be called new radio access technology (RAT) or new radio (NR). NR can also support vehicle-to-everything (V2X) communication.

[0004] 4 is a diagram for comparing and explaining V2X communication based on a RAT prior to NR and V2X communication based on NR. The embodiment of FIG. 1 may be combined with various embodiments of the present disclosure.

[0005] In relation to V2X communication, in RATs prior to NR, methods of providing safety services based on V2X messages such as Basic Safety Message (BSM), Cooperative Awareness Message (CAM), and Decentralized Environmental Notification Message (DENM) were mainly discussed. V2X messages can include location information, dynamic information, attribute information, etc. For example, a terminal can transmit a periodic message type CAM and / or an event triggered message type DENM to other terminals.

[0006] Since then, various V2X scenarios have been proposed in NR in relation to V2X communication. For example, various V2X scenarios can include vehicle platooning, advanced driving, extended sensors, remote driving, etc. Summary of the Invention [Means for solving the problem]

[0007] In one embodiment, a method for operating a first device 100 in a wireless communication system is proposed. The method may include the steps of establishing a sidelink (SL) unicast link with a second device 200, transmitting first SL discontinuous reception (DRX) setting information related to the SL unicast link to the second device 200, transmitting a physical sidelink control channel (PSCCH) to the second device 200 during an on-duration period included in the first SL DRX setting information, and transmitting a physical sidelink shared channel (PSSCH) to the second device 200 based on the PSCCH during the on-duration period. Effect of the Invention

[0008] The terminal can efficiently carry out SL communication. [Brief description of the drawings]

[0009] [Figure 1] This is a diagram for explaining a comparison between V2X communication based on a RAT prior to NR and V2X communication based on NR. [Diagram 2] 1 illustrates a structure of an NR system according to one embodiment of the present disclosure. [Diagram 3]1 illustrates a radio protocol architecture according to one embodiment of the present disclosure. [Figure 4] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure. [Diagram 5] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. [Figure 6] 1 illustrates an example of a BWP according to one embodiment of the present disclosure. [Figure 7] 1 illustrates a terminal performing V2X or SL communication according to one embodiment of the present disclosure. [Figure 8] According to one embodiment of the present disclosure, a procedure in which a terminal performs V2X or SL communication depending on a transmission mode is shown. [Figure 9] 1 illustrates three cast types according to one embodiment of the present disclosure. [Figure 10] 1 illustrates a procedure in which UE1 and UE2 perform sidelink DRX operation in PC5 Idle mode according to one embodiment of the present disclosure. [Figure 11] 1 illustrates a procedure in which UE1 and UE2 perform sidelink DRX operation in PC5 active mode according to one embodiment of the present disclosure. [Figure 12] 1 illustrates a procedure in which UE1 and UE2 switch their power saving modes to PC5 Idle mode in PC5 active mode according to one embodiment of the present disclosure. [Figure 13] 1 illustrates a procedure for a first device to perform wireless communication according to one embodiment of the present disclosure. [Figure 14] 1 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure. [Figure 15] 1 illustrates a communication system 1 according to an embodiment of the present disclosure. [Figure 16] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 17] 1 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. [Figure 18] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 20] 1 illustrates a vehicle or autonomous vehicle, according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] As used herein, "A or B" may mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" may be interpreted as "A and / or B." For example, as used herein, "A, B or C" may mean "only A," "only B," "only C," or "any combination of A, B and C."

[0011] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0012] In this specification, "at least one of A and B" can mean "only A", "only B", or "both A and B". In addition, in this specification, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B".

[0013] In addition, in this specification, "at least one of A, B and C" can 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" can mean "at least one of A, B and C."

[0014] In addition, parentheses used in this specification may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." In addition, "control information" in this specification is not limited to "PDCCH," and "PDDCH" is proposed as an example of "control information." In addition, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0015] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0016] The following technologies 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 in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless 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 in wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (registered trademark) 3rd generation partnership project (LTE) long term evolution (LTE) employs OFDMA on the downlink and SC-FDMA on the uplink as part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA).LTE-A (advanced) is an evolution of 3GPP LTE.

[0017] 5G NR is a successor technology to LTE-A and is a new clean-slate type mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) bands above 24 GHz.

[0018] For clarity of explanation, the following description will focus on 5G NR, but the technical idea of ​​an embodiment of the present disclosure is not limited thereto.

[0019] 2 shows a structure of an NR system according to one embodiment of the present disclosure. The embodiment of FIG. 2 can be combined with various embodiments of the present disclosure.

[0020] Referring to FIG. 2, the NG-RAN (Next Generation-Radio Access Network) may include a base station 20 that provides a terminal 10 with protocol termination of a user plane and a control plane. For example, the base station 20 may include a gNB (next generation-NodeB) and / or an eNB (evolved-NodeB). For example, the terminal 10 may be fixed or mobile, and may be referred to as other terms such as a MS (Mobile Station), a UT (User Terminal), a SS (Subscriber Station), a MT (Mobile Terminal), a Wireless Device, etc. For example, the base station is a fixed station that communicates with the terminal 10, and may be referred to as other terms such as a BTS (Base Transceiver System), an Access Point, etc.

[0021] The embodiment of FIG. 2 illustrates a case where only gNBs are included. The base stations 20 may be connected to each other via an Xn interface. The base stations 20 may be connected to a fifth generation core network (5G Core Network: 5GC) via an NG interface. More specifically, the base station 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.

[0022] The radio interface protocol layers between a terminal and a network can be divided into L1 (first layer), L2 (second layer), and L3 (third layer) based on the three lowest layers of the Open System Interconnection (OSI) reference model widely known in communication systems. Among these, the physical layer belonging to the first layer provides an information transfer service using a physical channel, and the Radio Resource Control (RRC) layer located in the third layer plays a role in controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0023] FIG. 3 illustrates a radio protocol architecture according to an embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure. Specifically, FIG. 3(a) illustrates a user plane radio protocol stack for Uu communication, and FIG. 3(b) illustrates a control plane radio protocol stack for Uu communication. FIG. 3(c) illustrates a user plane radio protocol stack for SL communication, and FIG. 3(d) illustrates a control plane radio protocol stack for SL communication.

[0024] Referring to FIG. 3, the physical layer provides information transfer services to a higher layer using physical channels. The physical layer is connected to a higher layer, the Medium Access Control (MAC) layer, via transport channels. Data moves between the MAC layer and the physical layer via the transport channels. Transport channels are classified according to how and what characteristics data is transmitted over the radio interface.

[0025] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which can be modulated using Orthogonal Frequency Division Multiplexing (OFDM) and uses time and frequency as radio resources.

[0026] The MAC layer provides services to the higher-level radio link control (RLC) layer via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transfer services on the logical channels.

[0027] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDUs (Service Data Units). To guarantee various Quality of Service (QoS) required by Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0028] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between the terminal and the network.

[0029] The functions of the PDCP layer in the user plane include transmission of user data, header compression, and ciphering, and the functions of the PDCP layer in the control plane include transmission of control plane data and encryption / integrity protection.

[0030] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane, and performs mapping between QoS flows and data radio bearers, QoS flow identifier (ID) marking in downlink and uplink packets, etc.

[0031] Configuring an RB means the process of defining the characteristics of a radio protocol layer and a channel to provide a specific service and setting each specific parameter and operation method. RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). SRB is used as a path to transmit RRC messages in the control plane, and DRB is used as a path to transmit user data in the user plane.

[0032] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal is in an RRC_CONNECTED state, otherwise, it is in an RRC_IDLE state. In the case of NR, an RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state maintains a connection with the core network and can release a connection with the base station.

[0033] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of downlink multicast or broadcast services can be transmitted via the downlink SCH or via a separate Multicast Channel (MCH). Meanwhile, uplink transport channels for transmitting data from a terminal to a network include a Random Access Channel (RACH) for transmitting initial control messages and a Shared Channel (SCH) for transmitting user traffic and control messages.

[0034] Above the transport channel, logical channels that are mapped to the transport channel include the Broadcast Control Channel (BCCH), the Paging Control Channel (PCCH), the Common Control Channel (CCCH), the Multicast Control Channel (MCCH), and the Multicast Traffic Channel (MTCH).

[0035] 4 illustrates a structure of a radio frame for NR according to one embodiment of the present disclosure. The embodiment of FIG. 4 can be combined with various embodiments of the present disclosure.

[0036] Referring to FIG. 4, in NR, radio frames can be used for uplink and downlink transmission. A radio frame has a length of 10 ms and can be defined as two 5 ms half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots in a subframe can be determined by a subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on a cyclic prefix (CP).

[0037] If normal CP is used, each slot can contain 14 symbols. If extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0038] Table 1 below shows the number of symbols per slot (N slot symb ), the number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0039] [Table 1]

[0040] Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when the extended CP is used.

[0041] [Table 2]

[0042] In the NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, and thus, the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols can be set to be different between the merged cells.

[0043] In NR, multiple numerologies or SCSs to support various 5G services can be supported. For example, if the SCS is 15 kHz, a wide area in a traditional cellular band can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. If the SCS is 60 kHz or higher, a bandwidth larger than 24.25 GHz can be supported to overcome phase noise.

[0044] The NR frequency band can be defined into two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges are as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6GHz range" and FR2 can mean the "above 6GHz range" and can be called millimeter wave (mmW).

[0045] [Table 3]

[0046] As described above, the values ​​of the frequency range of the NR system may be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for vehicles (e.g., autonomous driving).

[0047] [Table 4]

[0048] 5 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0049] 5, a slot includes a number of symbols in the time domain. For example, in the case of the normal CP, one slot may include 14 symbols, and in the case of the extended CP, one slot may include 12 symbols. Alternatively, in the case of the normal CP, one slot may include 7 symbols, and in the case of the extended CP, one slot may include 6 symbols.

[0050] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined as multiple (P)RBs ((Physical) Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed via an activated BWP. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0051] The following explains BWP (Bandwidth Part) and carriers.

[0052] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. A PRB can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0053] For example, the BWP is at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor downlink radiolink quality in DL BWPs other than an active DL BWP on a primary cell (PCell). For example, the UE does not receive a PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (without RRM) outside an active DL BWP. For example, the UE does not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE does not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside an active UL BWP. For example, when in the downlink, the initial BWP is given as a contiguous RB set for a remaining minimum system information (RMSI) CORESET (control resource set) (set by a physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for a random access procedure. For example, the default BWP is configured by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. In order to save energy, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0054] Meanwhile, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive an SL channel or an SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a terminal can receive a configuration for the SL BWP from a base station / network. For example, a terminal can receive a configuration for the Uu BWP from a base station / network. An SL BWP can be (pre) configured for out-of-coverage NR V2X terminals and RRC_IDLE terminals in a carrier. At least one SL BWP can be activated in a carrier for a terminal in an RRC_CONNECTED mode.

[0055] 6 shows an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 6, it is assumed that there are three BWPs.

[0056] Referring to Figure 6, CRB (common resource block) is a carrier resource block numbered from one end of a carrier band to the other end, and PRB is a resource block numbered within each BWP. Point A may indicate a common reference point for a resource block grid.

[0057] BWP is point A, offset from point A (N start BWP ) and bandwidth (N size BWP) For example, point A is the external reference point of the PRB of the carrier to which subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on the carrier) is aligned. For example, the offset is the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0058] The following describes V2X or SL communication.

[0059] The SLSS (Sidelink Synchronization Signal) is a SL-specific sequence and may include a PSSS (Primary Sidelink Synchronization Signal) and a SSSS (Secondary Sidelink Synchronization Signal). The PSSS may be referred to as an S-PSS (Sidelink Primary Synchronization Signal), and the SSSS may be referred to as an S-SSS (Sidelink Secondary Synchronization Signal). For example, length-127 M-sequences may be used for the S-PSS, and length-127 Gold sequences may be used for the S-SSS. For example, the terminal may perform initial signal detection and obtain synchronization using the S-PSS. For example, the terminal may obtain detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0060] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal should know first before transmitting and receiving an SL signal. For example, the basic information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool related information, application type related to SLSS, subframe offset, broadcast information, etc. For example, for evaluation of PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits including a 24-bit CRC (Cyclic Redundancy Check).

[0061] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an SLSS (Synchronization Signal) / PSBCH block, hereinafter, S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as a PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured SL BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. And the frequency location of the S-SSB can be (pre-) configured. Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0062] 7 illustrates a terminal performing V2X or SL communication according to an embodiment of the present disclosure. The embodiment of FIG. 7 may be combined with various embodiments of the present disclosure.

[0063] 7, the term terminal in V2X or SL communication may mainly mean a user terminal. However, when a network device such as a base station transmits and receives a signal by a communication method between terminals, the base station may also be considered as a kind of terminal. For example, terminal 1 is a first device 100, and terminal 2 is a second device 200.

[0064] For example, terminal 1 can select a resource unit corresponding to a specific resource in a resource pool, which means a collection of resources. Then, terminal 1 can transmit an SL signal using the resource unit. For example, terminal 2, which is a receiving terminal, can receive a setting of a resource pool to which terminal 1 can transmit a signal, and can detect a signal of terminal 1 in the resource pool.

[0065] Here, when the terminal 1 is within the connection range of the base station, the base station can inform the terminal 1 of the resource pool. On the other hand, when the terminal 1 is outside the connection range of the base station, other terminals can inform the resource pool, or the terminal 1 can use a pre-configured resource pool.

[0066] In general, a resource pool may be composed of multiple resource units, and each terminal may select one or multiple resource units to use for transmitting its SL signal.

[0067] The following describes resource allocation in SL.

[0068] FIG. 8 illustrates a procedure in which a terminal performs V2X or SL communication according to a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 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 convenience of description, in LTE, the transmission mode may be referred to as an LTE transmission mode, and in NR, the transmission mode may be referred to as an NR resource allocation mode.

[0069] For example, (a) of FIG. 8 illustrates a terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Or, for example, (a) of FIG. 8 illustrates a terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to general SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0070] For example, (b) of FIG. 8 illustrates a terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 8 illustrates a terminal operation associated with NR resource allocation mode 2.

[0071] Referring to (a) of FIG. 8, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station can schedule SL resources used by a terminal for SL transmission. For example, a base station can perform resource scheduling for terminal 1 via a PDCCH (e.g., Downlink Control Information (DCI)) or RRC signaling (e.g., Configured Grant Type 1 or Configured Grant Type 2), and terminal 1 can perform V2X or SL communication with terminal 2 through the resource scheduling. For example, terminal 1 can transmit Sidelink Control Information (SCI) to terminal 2 via a Physical Sidelink Control Channel (PSCCH), and then transmit data based on the SCI to terminal 2 via a Physical Sidelink Shared Channel (PSSCH).

[0072] Referring to (b) of FIG. 8, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal may determine an SL transmission resource within a SL resource configured by a base station / network or a preconfigured SL resource. For example, the configured SL resource or the preconfigured SL resource is a resource pool. For example, the terminal may autonomously select or schedule a resource for SL transmission. For example, the terminal may autonomously select a resource within a configured resource pool to perform SL communication. For example, the terminal may perform sensing and resource (re)selection procedures and autonomously select a resource within a selection window. For example, the sensing may be performed on a subchannel basis. Then, the terminal 1 that autonomously selects a resource within a resource pool may transmit an SCI to the terminal 2 via a PSCCH, and then transmit data based on the SCI to the terminal 2 via a PSSCH.

[0073] FIG. 9 illustrates three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, FIG. 9 (a) illustrates broadcast type SL communication, FIG. 9 (b) illustrates unicast type SL communication, and FIG. 9 (c) illustrates groupcast type SL communication. In the case of unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present disclosure, the SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0074] On the other hand, Release 16 NR V2X does not support power saving operation of the UE, but Release 17 NR V2X is scheduled to support power saving operation of the UE.

[0075] In addition, NR V2X supports unicast connection configuration between UEs. For example, a PC5 unicast connection is configured for sidelink transmission and reception between UE#A and UE#B, and if a PC5 unicast connection is configured, the UE#A and the UE#B can transmit and receive PC5 RRC messages. Also, for example, the UE#A and the UE#B can establish a PC5 RRC connection and transmit and receive UE capabilities information and sidelink radio bearer information.

[0076] For example, in order to save power of the UE, the power saving operation is defined to be different between a state where a PC5 unicast connection is established and a state where a PC5 unicast connection is not established. That is, when sidelink communication between UEs is continuously performed, message transmission and reception between UEs occurs frequently, so when a sidelink DRX (discontinuous reception) setting is configured, it is necessary to configure a sidelink DRX setting so that the UE wakes up frequently. For example, a short sidelink DRX setting is configured so that the UE wakes up frequently. The short sidelink DRX setting may include a short sidelink DRX cycle and a short sleep duration. Conversely, for example, when sidelink communication between UEs is rarely performed, message transmission and reception between UEs does not occur frequently, so when a sidelink DRX setting is configured, the sidelink DRX setting is configured so that the UE wakes up once in a long cycle. For example, a long sidelink DRX setting is configured so that the UE wakes up once in a long cycle. For example, the long sidelink DRX setting may include a long sidelink DRX cycle and a long sleep duration. Through this, it is necessary to maximize the power saving effect of the UE.

[0077] Therefore, the present disclosure proposes a method to enable a UE supporting a power saving operation (e.g., sidelink DRX) to perform the power saving operation differently depending on whether the UE performs inter-UE sidelink communication continuously or not.

[0078] In this disclosure, two types of power saving modes are proposed via Proposal 1 and Proposal 2, and the operation of the UE in each proposed power saving mode is also proposed.

[0079] Suggestion 1.

[0080] According to one embodiment of the present disclosure, a power saving mode, PC5 Idle mode, is newly defined, and a sidelink DRX operation procedure in the PC5 Idle mode is also defined as follows.

[0081] PC5 Idle Mode

[0082] According to an embodiment of the present disclosure, a state in which a PC5 unicast connection (and / or a PC5 RRC connection) for sidelink communication between UEs is not established is defined as the PC5 idle mode. That is, the PC5 idle mode may be a state in which no sidelink data is continuously (or periodically) transmitted and received between UEs. Therefore, a UE supporting a power saving operation (e.g., sidelink DRX) in the PC5 idle mode periodically monitors whether there is a sidelink signal (e.g., PSCCH) or sidelink data (e.g., PSBCH, PSSCH) transmitted to the UE from an awake neighboring UE once, thereby reducing power consumption. Therefore, in the present disclosure, a PC5 idle mode specific sidelink DRX configuration used by a UE to perform a sidelink DRX operation in the PC5 idle mode is defined as follows. For example, the sidelink DRX operation may include an operation in which a UE receives a sidelink signal or sidelink data from an awake neighboring UE during a sidelink DRX on period, and an operation in which a UE transitions to a sleep mode during a sidelink DRX off period to reduce power consumption.

[0083] In the present disclosure, the power saving mode of a UE that is not configured for a PC5 unicast connection (and / or a PC5 RRC connection) has been mainly defined as the PC5 Idle mode, but the PC5 Idle mode described in the present disclosure can be extended to the power saving mode of a UE configured for a PC5 unicast connection (and / or a PC5 RRC connection). That is, a UE configured for a PC5 unicast connection (and / or a PC5 RRC connection) can also perform a sidelink DRX operation using a PC5 Idle mode specific sidelink DRX configuration for the PC5 Idle mode. That is, for example, even if a PC5 unicast connection is configured, the power saving mode can be initiated to the PC5 Idle mode, or if the power saving mode is operating in the PC5 active mode, it is possible to switch to the PC5 Idle mode without releasing the PC5 unicast connection. For example, the above-mentioned features may refer to the SidelinkDRXReconfiguration message of Proposal 2.

[0084] PC5 Idle Mode Specific Sidelink DRX Settings

[0085] According to an embodiment of the present disclosure, the PC5 idle mode specific sidelink DRX configuration is applied only when there is no sidelink data continuously (or periodically) received during the sidelink on-duration in the PC5 idle mode. That is, the sidelink on-duration operation in the PC5 idle mode may be a sidelink DRX operation for checking whether a nearby UE has a sidelink signal to transmit. Thus, for example, the period of the sidelink DRX on-duration used by the UE in the PC5 idle mode may be set to be (relatively) long. That is, the sidelink DRX configuration used by the UE in the PC5 idle mode is configured as a long sidelink DRX configuration. For example, the long sidelink DRX configuration may include a configuration in which the period of the DRX on-duration (e.g., awake mode) period is set to be long and the DRX off-duration (e.g., sleep mode) period existing until the next DRX on-duration is set to be long.

[0086] On the other hand, for example, in another method, the sidelink DRX configuration used by the UE in PC5 idle mode may be configured as a short sidelink DRX configuration, for example, the short sidelink DRX configuration may include a configuration in which the DRX on duration is set to be short and the DRX off duration existing until the next DRX on duration is set to be short.

[0087] According to an embodiment of the present disclosure, a feature is proposed in which a sidelink DRX configuration used by a UE in PC5 idle mode is mapped to a specific region in which the UE is located. That is, for example, a sidelink DRX configuration is mapped by zone area, and the UE can cache sidelink DRX configuration information mapped by zone ID. Therefore, if a UE knows only the zone ID of the zone in which the UE is located, the UE can infer a sidelink DRX configuration mapped to the zone ID. For example, a UE (TX UEs or RX UEs) in PC5 idle mode can use a sidelink DRX configuration mapped to its own zone ID as a default.

[0088] For example, the zone-based sidelink DRX configuration proposed in this disclosure is only one embodiment of a sidelink DRX configuration used by a UE in PC5 idle mode, and various other methods are provided for a long sidelink DRX configuration used in PC5 idle mode. For example, the base station may transmit a PC5 idle mode specific sidelink DRX configuration to a UE in PC5 idle mode via a SIB. For example, the PC5 idle mode specific sidelink DRX configuration may include a long sidelink DRX period, a sidelink on-duration duration, a sidelink on-duration start offset, etc.

[0089] According to an embodiment of the present disclosure, a zone-based common sidelink DRX configuration that a UE can use in PC5 idle mode is defined. For example, in the zone-based sidelink DRX configuration, a UE can infer a sidelink DRX configuration that matches the zone ID in which the UE is located. On the other hand, for example, if the UE does not preconfigure a sidelink DRX configuration, the UE can acquire a PC5 idle mode specific sidelink DRX configuration from the base station. For example, the UE can acquire the PC5 idle mode specific sidelink DRX configuration via a dedicated RRC message or SIB.

[0090] According to an embodiment of the present disclosure, a default / general sidelink DRX configuration is defined that can be commonly used by PC5 idle mode UEs that do not have a PC5 unicast connection. For example, the default / general sidelink DRX configuration may include a sidelink DRX period, a sidelink on-period duration, a sidelink DRX on-period start offset, and a sidelink DRX operation timer. For example, the default / general sidelink DRX configuration is configured based on service or QoS information of the UE from the base station and transmitted to the UE. The default / general sidelink DRX configuration is transmitted to the UE via a SIB and / or a dedicated RRC message. The UE may also transmit the default / general sidelink DRX configuration to a corresponding neighboring UE via a PC5 RRC message. For example, a PC5 idle mode UE that does not have a PC5 unicast connection may perform a sidelink DRX operation based on the default / general sidelink DRX configuration. For example, the sidelink DRX operation may include an on-period operation: sidelink data reception / transmission, and an off-period operation: sleep mode operation after the on-period expires.

[0091] Sidelink DRX Operation

[0092] According to one embodiment of the present disclosure, the sidelink DRX operation of a UE in PC5 Idle mode is defined as follows:

[0093] According to an embodiment of the present disclosure, a PC5 idle UE that has a capability for sidelink communication and sidelink DRX operation but does not yet have a PC5 unicast connection and a PC5 RRC connection with a peer UE may use the previously proposed PC5 idle mode specific sidelink DRX configuration for sidelink DRX operation. That is, a UE in PC5 idle mode may check the PC5 idle mode specific sidelink DRX configuration and monitor sidelink signals of neighboring UEs at the start of a sidelink DRX on period. Then, the UE may operate in a sleep mode during a period other than the sidelink DRX on period (e.g., a sidelink DRX off period) to reduce power consumption. Thereafter, the UE may wake up and monitor sidelink signals of neighboring UEs during the DRX on period of the next sidelink DRX cycle. For example, if a UE in PC5 idle mode receives a sidelink signal of a neighboring UE during a PC5 idle mode specific sidelink DRX on period and needs to continuously transmit or receive sidelink messages, the UEs in PC5 idle mode may establish a PC5 unicast connection (and / or a PC5 RRC connection) with each other. For example, a UE in PC5 Idle mode may transition to PC5 Activated mode and negotiate a PC5 Activated mode specific sidelink DRX configuration by exchanging PC5 RRC messages (SidelinkDRXReconfiguration message, SidelinkDRXReconfigurationComplete message) of Proposal 2. Thereafter, the UE in PC5 Idle mode may transition to PC5 Activated mode and perform a sidelink DRX operation using a PC5 Activated mode specific sidelink DRX configuration.

[0094] 10 illustrates a procedure in which UE1 and UE2 perform sidelink DRX operation in PC5 Idle mode according to one embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0095] For example, FIG. 10 may illustrate an embodiment of a sidelink operation of a UE in PC5 idle mode. Referring to FIG. 10, for example, UE1 and / or UE2 may support sidelink communication and support sidelink DRX operation. For example, the default operation mode for sidelink communication of UE1 and / or UE2 may be PC5 idle mode. For example, in this embodiment, UE1 and / or UE2 may start in PC5 idle mode. For example, in this embodiment, UE1 and / or UE2 may have no traffic for sidelink communication with a neighboring UE, or may have only sidelink traffic related to groupcast / broadcast even if there is traffic for sidelink communication. For example, the groupcast / broadcast may be communication that is transmitted / received / broadcast once from time to time. That is, for example, UE1 and / or UE2 may not establish a PC5 unicast connection and a PC5 RRC connection with a relative UE. For example, the relative UE may be a peer UE. Also, for example, there may be no unicast sidelink data related to sidelink communication with the neighboring UE.

[0096] In step S1010, if the UE1 and / or the UE2 are interested in transmitting / receiving sidelink data, the UE1 and / or the UE2 may include sidelink-related information in a SidelinkUEInformation message and transmit it to the base station. For example, the sidelink-related information may include frequency information on which sidelink communication is performed, QoS information for sidelink data when there is sidelink traffic, a sidelink DRX configuration independently generated by the UE1, and / or sidelink capability information. For example, the sidelink DRX configuration may include a PC5 Idle mode specific sidelink DRX configuration generated in a V2X layer and transmitted to an AS layer and / or a PC5 Idle mode specific sidelink DRX configuration matched (or mapped) based on a zone. For example, the sidelink capability information may include whether a sidelink DRX operation is supported and / or whether a sidelink HARQ operation is supported.

[0097] In step S1020, the base station may transmit PC5 Idle mode specific sidelink DRX configuration information to the UE1 and / or the UE2 by referring to sidelink related information of the UE1 and / or the UE2 included in the SidelinkUEInformation message received from the UE1 and / or the UE2. For example, the PC5 Idle mode specific sidelink DRX configuration information may be transmitted via a SIB and / or a dedicated RRC message. For example, the PC5 Idle mode specific sidelink DRX configuration information may be different from a sidelink DRX configuration independently generated by the UE1 and / or the UE2. For example, if the UE1 and / or the UE2 cannot receive PC5 Idle mode specific sidelink DRX configuration information from the base station, the UE1 and / or the UE2 may use a PC5 Idle mode specific sidelink DRX configuration independently generated by the UE1 and / or the UE2.

[0098] In step S1030, the UE1 and / or the UE2 can perform sidelink DRX operation in PC5 idle mode using PC5 idle mode specific sidelink DRX configuration information configured by the base station or configured by the UE1 and / or the UE2 itself.

[0099] Suggestion 2.

[0100] According to one embodiment of the present disclosure, a power saving mode, a PC5 activation mode, is newly defined, and a sidelink DRX operation procedure in the PC5 activation mode is also defined as follows.

[0101] PC5 Activation Mode

[0102] In this disclosure, a power saving mode in which a UE sets up a PC5 unicast connection and a PC5 RRC connection with other UEs and performs full-scale sidelink transmission and reception is defined as a PC5 active mode.

[0103] PC5 Activation Mode Specific Sidelink DRX Settings

[0104] For example, if a RX UE receives something from another UE during a sidelink DRX on period and full-scale transmission and reception is performed, the sidelink DRX configuration of the RX UE needs to be reconfigured to be specific to the RX UE or to be reconfigured to be specific to the QoS requirement of the sidelink data (or sidelink service). For example, the QoS requirement of the sidelink data may include a packet delay budget or a latency requirement.

[0105] For example, a PC5 idle specific sidelink DRX configuration used by a UE in PC5 idle mode may be a long sidelink DRX configuration commonly used by all UEs supporting sidelink communication to monitor sidelink signals of neighboring UEs, while a PC5 active mode specific sidelink DRX configuration may be a sidelink DRX configuration configured to satisfy a QoS requirement of sidelink data (or sidelink service) to support continuous sidelink transmission / reception between a TX UE and a RX UE. For example, the QoS requirement of the sidelink data may include a PQI (PC5 5QI) or a PFI (PC5 QoS Flow Identifier). For example, the QoS requirement may include a packet delay budget and / or a delay requirement among the PQI items. For example, the PC5 active mode specific sidelink DRX configuration may be configured as a short sidelink DRX configuration having a shorter period than the PC5 idle mode specific sidelink DRX configuration. For example, the short sidelink DRX configuration may include a short sidelink DRX period, a sidelink on-duration duration, a sidelink DRX on-duration start offset, etc.

[0106] According to an embodiment of the present disclosure, the PC5 activation mode specific sidelink DRX configuration is configured as a long sidelink DRX configuration having a longer period than the PC5 idle mode specific sidelink DRX configuration. For example, the long sidelink DRX configuration may include a long sidelink DRX period, a long sidelink on-period duration, a sidelink DRX on-period start offset, etc. That is, the PC5 activation mode specific sidelink DRX configuration is configured to have a long DRX on-period (e.g., awake mode) duration and a long DRX off-period (e.g., sleep mode) duration until the next DRX on-period.

[0107] According to one embodiment of the present disclosure, a PC5 RRC message is proposed for UEs supporting sidelink power save operation to mutually exchange and negotiate configuration parameters required to perform power save mode operation.

[0108] Sidelink DRX Reconfiguration Message

[0109] According to an embodiment of the present disclosure, a method is newly proposed in which a Sidelink DRX Reconfiguration message is used for the purpose of inter-UE exchange / configuration of configuration parameters required for performing power saving mode operations.

[0110] The present disclosure also proposes a method in which a UE in PC5 Idle mode uses a SidelinkDRXReconfiguration message as a target PC5 RRC message for transitioning to a PC5 activated mode and initiating a PC5 activated mode specific sidelink DRX configuration negotiation. For example, the SidelinkDRXReconfiguration message may be generated in the UE initiating the PC5 activated mode specific sidelink DRX configuration negotiation, or may include a PC5 activated mode specific sidelink DRX configuration previously acquired by the UE from a base station. For example, the SidelinkDRXReconfiguration message may be generated in a V2X layer of the UE. Also, for example, the SidelinkDRXReconfiguration message may include identifier (e.g., PQI or PFI) information indicating QoS requirements (QoS parameters) for sidelink data (or sidelink services).

[0111] According to an embodiment of the present disclosure, a method is proposed for enabling a UE in PC5 activation mode to transmit a Sidelink DRX Reconfiguration message to a peer UE when the UE transitions to PC5 idle mode in PC5 activation mode. In this case, that is, when a UE transitions to PC5 idle mode in PC5 activation mode, a UE that has initiated the transition to PC5 idle mode in PC5 activation mode may include a PC5 idle mode specific sidelink DRX configuration in a Sidelink DRX Reconfiguration message and transmit the message to the peer UE. For example, the peer UE may include a UE that has established a PC5 unicast connection with a UE that has initiated the transition to PC5 idle mode in PC5 activation mode and is performing a sidelink DRX operation using a PC5 activation mode specific sidelink DRX configuration.

[0112] According to one embodiment of the present disclosure, the proposed message (Sidelink DRX Reconfiguration message) is also used to exchange power saving mode operation parameters between UEs in the same power saving mode, for example, the power saving mode operation parameters may include sidelink DRX configuration.

[0113] According to one embodiment of the present disclosure, the Sidelink DRX Reconfiguration message may include the elements described below.

[0114] For example, the Sidelink DRX Reconfiguration message may include a power saving mode start. That is, the Sidelink DRX Reconfiguration message may indicate the start of a power saving mode initial operation. For example, if the power saving mode start is 0, it may indicate the start of a PC5 idle mode. For example, if the power saving mode start is 1, it may indicate the start of a PC5 active mode.

[0115] For example, the SidelinkDRXReconfiguration message may include a sidelink DRX configuration. For example, the SidelinkDRXReconfiguration message may include power saving mode specific sidelink DRX operation configuration information. For example, the power saving mode specific sidelink DRX operation configuration information may include a PC5 idle mode specific sidelink DRX configuration and / or a PC5 active mode specific sidelink DRX configuration.

[0116] For example, the Sidelink DRX Reconfiguration message may include a "power save mode switch" instruction. For example, the Sidelink DRX Reconfiguration message may instruct switching (or reconfiguration) of a currently active power save mode operation. For example, when the power save mode switch is 0, it may indicate switching to a PC5 active mode in a PC5 idle mode. For example, when the power save mode switch is 1, it may indicate switching to a PC5 idle mode in a PC5 active mode.

[0117] For example, the SidelinkDRXReconfiguration message may include an indication of "sidelink DRX reconfiguration". For example, the SidelinkDRXReconfiguration message may indicate reconfiguration or keeping of sidelink DRX configuration information (i.e., keeping the current reconfiguration). For example, a value of 0 for the sidelink DRX reconfiguration indication may indicate no change, i.e., keeping the current reconfiguration. For example, a value of 1 for the sidelink DRX reconfiguration indication may indicate reconfiguration of the sidelink DRX configuration.

[0118] For example, the SidelinkDRXReconfiguration message may include an indication of "PC5 unicast connection (and / or PC5 RRC connection)". For example, the SidelinkDRXReconfiguration message may indicate establishment of a PC5 unicast connection (and / or PC5 RRC connection) and release of a PC5 unicast connection (and / or PC5 RRC connection). For example, when the indication of the PC5 unicast connection is 0, this may indicate establishment of a PC5 unicast connection (and / or PC5 RRC connection). For example, when the indication of the PC5 unicast connection is 1, this may indicate release of a PC5 unicast connection (and / or PC5 RRC connection).

[0119] SidelinkDRXReconfigurationComplete Message

[0120] According to an embodiment of the present disclosure, a SidelinkDRXReconfigurationComplete message is defined as a response message to the SidelinkDRXReconfiguration message. For example, a UE receiving the SidelinkDRXReconfiguration message can determine whether to permit a power saving mode operation (e.g., a sidelink DRX operation) using a power saving mode operation instruction and a power saving mode-specific setting parameter included in the SidelinkDRXReconfiguration message.

[0121] For example, if a UE that has received a SidelinkDRXReconfiguration message approves the power saving mode operation command and configuration parameters included in the SidelinkDRXReconfiguration message, the UE may respond by including "accept" in the cause of a SidelinkDRXReconfigurationComplete message. For example, if the UE does not approve the power saving mode operation command and configuration parameters included in the SidelinkDRXReconfigurationComplete message, the UE may transmit a SidelinkDRXReconfigurationComplete message with "reject" as the cause to the peer UE.

[0122] According to an embodiment of the present disclosure, a method is proposed in which a UE in PC5 active mode transmits a Sidelink DRX Reconfiguration message to a peer UE when the UE transitions to PC5 idle mode. For example, a UE that receives a Sidelink DRX Reconfiguration message transmitted by a UE that initiates transition to PC5 idle mode in PC5 active mode may transition to PC5 idle mode after responding to a Sidelink DRX Reconfiguration Complete message. In addition, a UE that transitions to PC5 idle mode may release a PC5 unicast connection and a PC5 RRC connection, and perform a sidelink DRX operation in PC5 idle mode using a PC5 idle mode specific sidelink DRX configuration included in the received Sidelink DRX Reconfiguration message.

[0123] According to one embodiment of the present disclosure, the proposed message (SidelinkDRXReconfigurationComplete message) is also used to exchange inter-UE power saving mode operating parameters (e.g., sidelink DRX configuration) in the same power saving mode.

[0124] According to one embodiment of the present disclosure, the SidelinkDRXReconfigurationComplete message may include the elements described below.

[0125] For example, the SidelinkDRXReconfigurationComplete message may include a cause. For example, if the cause is "Accept," it may mean that the UE receiving the SidelinkDRXReconfiguration message approves the use of the instructions and configuration information included in the message. For example, if the cause is "Reject," it may mean that the UE receiving the SidelinkDRXReconfiguration message rejects the use of the instructions and configuration information included in the message.

[0126] According to one embodiment of the present disclosure, a method is proposed in which a PC5 active mode terminal (e.g., a terminal that has established a PC5 unicast connection and / or a PC5 RRC connection) applies a PC5 active mode specific sidelink DRX configuration to perform a sidelink DRX operation, and also applies a default / general sidelink DRX configuration (used by UEs in PC5 idle mode) to perform a sidelink DRX operation.

[0127] For example, the sidelink DRX operation may include an on-period operation: sidelink data reception / transmission, and an off-period operation: sleep mode operation after the on-period expires. For example, a PC5 active mode UE needs to perform sidelink communication with a UE that has established a PC5 unicast connection and / or a PC5 RRC connection, and also needs to receive signals from UEs that have not established a PC5 unicast connection and / or a PC5 RRC connection with the PC5 active mode UE. Therefore, the PC5 active mode UE needs to perform a sidelink DRX operation using a default / general sidelink DRX configuration (configured for a PC5 idle mode UE). That is, according to one embodiment of the present disclosure, a method is proposed in which a PC5 active mode UE performs a sidelink DRX operation by simultaneously applying a PC5 active mode specific sidelink DRX configuration and a default / general sidelink DRX configuration for a PC5 idle mode UE.

[0128] According to an embodiment of the present disclosure, a method is proposed in which a PC5 active mode specific sidelink DRX on duration for a PC5 active mode terminal includes a PC5 idle mode specific sidelink DRX on duration for a PC5 idle mode terminal (or a default / general sidelink on duration included in a default / general sidelink DRX configuration).

[0129] Sidelink DRX Operation

[0130] According to one embodiment of the present disclosure, the sidelink DRX operation of a UE in PC5 activated mode is defined as follows:

[0131] For example, a UE that has functions for sidelink communication and sidelink DRX operation and has established a PC5 unicast connection and a PC5 RRC connection with a peer UE may use the PC5 activation mode specific sidelink DRX configuration proposed in the present disclosure for sidelink DRX operation, i.e., a UE in PC5 activation mode may check the PC5 activation mode specific sidelink DRX configuration and monitor sidelink signals of neighboring UEs at the start of a sidelink DRX on period.

[0132] For example, in a period other than the sidelink DRX on period (e.g., the sidelink DRX off period), the UE in the PC5 activation mode operates in a sleep mode to reduce power consumption. Then, the UE in the PC5 activation mode can monitor the sidelink signals of neighboring UEs awake during the DRX on period of the next sidelink DRX cycle.

[0133] If, for example, the UE in the PC5 active mode determines that continuous sidelink message transmission and reception is no longer necessary after receiving a sidelink signal from a neighboring UE during a PC5 active mode specific sidelink DRX on period, the UEs in the PC5 active mode may exchange PC5 RRC messages described in Proposal 2, release the PC5 unicast connection (and / or PC5 RRC connection), and transition to the PC5 idle mode. Also, for example, the UE transitioning to the PC5 idle mode may perform a sidelink DRX operation using a PC5 idle mode specific sidelink DRX configuration included in a SidelinkDRXReconfiguration message. For example, the PC5 RRC message described in Proposal 2 may include a SidelinkDRXReconfiguration message and / or a SidelinkDRXReconfigurationComplete message.

[0134] 11 illustrates a procedure in which UE1 and UE2 perform sidelink DRX operations in PC5 active mode according to an embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0135] For example, FIG. 11 may illustrate an embodiment of a sidelink operation of a UE in a PC5 active mode. Referring to FIG. 11, for example, UE1 and / or UE2 may support sidelink communication and support a sidelink DRX operation. For example, a default operation mode for sidelink communication of the UE1 and / or the UE2 may be a PC5 idle mode. For example, in this embodiment, the UE1 and / or the UE2 may start in the PC5 idle mode. Also, for example, the UE1 and / or the UE2 may perform a sidelink DRX operation using a PC5 idle mode specific sidelink DRX configuration in the PC5 idle mode.

[0136] In step S1110, sidelink traffic may occur in the UE1 that has been performing a sidelink DRX operation in PC5 Idle mode. For example, the sidelink traffic may be related to full-scale sidelink communication between the UE1 and the UE2. For example, sidelink data requiring unicast sidelink transmission may continue to occur after the sidelink traffic.

[0137] In step S1120, UE1 may establish a PC5 unicast connection and a PC5 RRC connection with UE2 for continuous unicast sidelink data transmission to UE2.

[0138] In step S1130, the UE1 includes sidelink related information in a SidelinkUEInformation message and transmits it to the base station. For example, the sidelink related information may include frequency information on which sidelink communication is performed, QoS information for unicast sidelink data, sidelink capability information, etc. For example, the sidelink capability information may include whether or not a sidelink DRX operation is supported and / or whether or not a sidelink HARQ operation is supported, etc. For example, if there is a sidelink DRX configuration independently generated by the UE1, the UE1 may include a PC5 activation mode specific sidelink DRX configuration in the SidelinkUEInformation message and transmit it to the base station. For example, the sidelink DRX configuration independently generated by the UE1 may be a PC5 activation mode specific sidelink DRX configuration generated based on the QoS of the unicast sidelink data in the V2X layer.

[0139] In step S1140, the base station may transmit PC5 activation mode specific sidelink DRX configuration information to the UE1 based on the sidelink information of the UE1 included in the SidelinkUEInformation message received from the UE1. For example, the PC5 activation mode specific sidelink DRX configuration information transmitted by the base station to the UE1 may be different from the PC5 activation mode specific sidelink DRX configuration information generated by the UE1. For example, if the UE1 cannot receive the PC5 activation mode specific sidelink DRX configuration information from the base station, the UE1 may use the PC5 activation mode specific sidelink DRX configuration generated by the UE1. For example, the base station may transmit the PC5 activation mode specific sidelink DRX configuration information via a dedicated RRC message or SIB.

[0140] For example, the UE1 may perform a sidelink DRX operation in the PC5 activation mode using PC5 activation mode specific sidelink DRX configuration information configured by the base station or configured by itself. In step S1150, the UE1 may include the PC5 activation mode specific sidelink DRX configuration information received from the base station in a SidelinkDRXReconfiguration message and transmit it to the UE2.

[0141] In step S1160, the UE2 may indicate a transition to the PC5 activation mode through a SidelinkDRXReconfiguration message from the UE1. The UE2 may also receive a PC5 activation mode specific sidelink DRX configuration to be used in the PC5 activation mode from the UE1. For example, after the UE2 receives the SidelinkDRXReconfiguration message, the UE2 may respond to the UE1 with a SidelinkDRXReconfigurationComplete message containing a reason of "approval" if the UE2 approves the use of the PC5 activation mode operation instruction and the PC5 activation mode specific sidelink DRX configuration included in the SidelinkDRXReconfiguration message. Alternatively, after UE2 receives the SidelinkDRXReconfiguration message, if UE2 does not approve the PC5 activation mode operation instruction and the use of a PC5 activation mode specific sidelink DRX configuration included in the SidelinkDRXReconfiguration message (i.e., does not allow execution of the PC5 activation mode operation and the use of a PC5 activation mode specific sidelink DRX configuration), it may transmit a SidelinkDRXReconfigurationComplete message to UE1 with a reason including “reject”.

[0142] In step S1170, the UE1 and / or the UE2 may transition from a power saving mode in a PC5 idle mode to a PC5 activated mode and perform a sidelink DRX operation using a PC5 activated mode specific sidelink DRX configuration. In the above embodiment, it has been described that the UE1 and / or the UE2 may transition from a power saving mode in a PC5 idle mode to a PC5 activated mode after exchanging a SidelinkDRXReconfiguration message and a SidelinkDRXReconfigurationComplete message. Meanwhile, for example, in another embodiment, an operation method is supported in which the UE1 and / or the UE2 may transition to a PC5 activated mode immediately after establishing a PC5 unicast connection and a PC5 RRC connection, exchange a SidelinkDRXReconfiguration message and a SidelinkDRXReconfigurationComplete message, and then apply a PC5 activated mode specific sidelink DRX configuration to perform a PC5 activated mode specific sidelink DRX operation.

[0143] Suggestion 3.

[0144] According to one embodiment of the present disclosure, a method is proposed for a UE supporting a power saving mode operation to perform a transition operation between a PC5 idle mode and a PC5 active mode.

[0145] According to an embodiment of the present disclosure, an operation of switching an inter-UE power saving mode is also proposed. Proposal 2 of the present disclosure proposes an operation of switching a power saving mode from an inter-UE PC5 idle mode to a PC5 active mode.

[0146] 12 illustrates a procedure in which UE1 and UE2 switch the power saving mode to PC5 Idle mode in PC5 Activation mode according to an embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

[0147] For example, Figure 12 may show a power saving mode switching operation to PC5 Idle mode in PC5 Activation mode. Referring to Figure 12, UE1 and UE2 may perform sidelink DRX operation by applying PC5 Activation mode specific sidelink DRX configuration in PC5 Activation mode. For example, there may be no unicast sidelink data between UE1 and a peer UE (e.g., UE2) that has established a PC5 unicast connection with UE1 for a certain period of time. In this case, UE1 may initiate a power saving mode transition to PC5 Idle mode.

[0148] In step S1210, the UE1 may include a power saving mode switching indication in a Sidelink DRX Reconfiguration message and transmit the same to the UE2. For example, the power saving mode switching is switching from a PC5 active mode to a PC5 idle mode. For example, PC5 idle mode specific sidelink DRX configuration information is included in the Sidelink DRX Reconfiguration message. For example, the PC5 idle mode specific sidelink DRX configuration information may include a PC5 idle mode specific sidelink DRX configuration generated in a V2X layer of a UE or a PC5 idle mode specific sidelink DRX configuration previously received and kept by the UE1 from a base station.

[0149] For example, the UE2, which receives the SidelinkDRXReconfiguration message from the UE1 to instruct transition to the PC5 Idle mode, may receive from the UE1 a PC5 Idle mode specific sidelink DRX configuration to be used in the PC5 Idle mode. In step S1220, after receiving the SidelinkDRXReconfiguration message, if the UE2 approves the use of the PC5 Idle mode operation instruction and the PC5 Idle mode specific sidelink DRX configuration included in the SidelinkDRXReconfiguration message, the UE2 may respond to the UE1 with a SidelinkDRXReconfigurationComplete message including a reason of "approval". On the other hand, for example, if the UE2 does not approve the use of the PC5 Idle mode operation instruction and the PC5 Idle mode specific sidelink DRX configuration included in the SidelinkDRXReconfiguration message, the UE2 may transmit a SidelinkDRXReconfigurationComplete message including a reason of "rejection" to the UE1.

[0150] In step S1240, the UE1 and / or the UE2 may release the PC5 unicast connection (and the PC5 RRC connection) and transition from the power saving mode to the PC5 Idle mode. According to another embodiment, the UE1 and / or the UE2 may release the PC5 unicast connection (and the PC5 RRC connection) after transitioning to the PC5 Idle mode.

[0151] In step S1250, the UE1 and / or the UE2 may transition from the power saving mode to the PC5 Idle mode in the PC5 Activation mode, and then may perform a sidelink DRX operation by applying a PC5 Idle mode specific sidelink DRX configuration.

[0152] In step S1260, the UE1 may include the power saving mode change fact in a SidelinkUEInformation message and transmit it to the base station. For example, the SidelinkUEInformation message may also include identifier information (Layer 2 ID) of a previous PC5 unicast peer UE (e.g., UE2). For example, the peer UE may include a peer UE that established a PC5 unicast connection before transitioning to the PC5 idle mode and operated in the PC5 active mode together.

[0153] For example, the on-duration term mentioned in the proposal of the present disclosure may be extended to an active time interval. For example, the active time may include an interval during which the RF module operates in an awake state (i.e., the RF module is in an "On" state) to receive / transmit a wireless signal. In addition, the application and / or related parameters (e.g., thresholds) of (a part of) the proposed method / rule of the present disclosure may be specifically (or differently or independently) set based on a resource pool, a congestion level, a service priority, a service type, a service requirement, and / or a sidelink transmission resource allocation mode (e.g., mode 1, mode 2), etc. For example, the service requirement may include latency, reliability, and traffic type (e.g., (a)periodic generation).

[0154] According to various embodiments of the present disclosure, a power saving operation for a UE supporting sidelink communication is proposed, and the power consumption of the UE for sidelink communication can be reduced based on the power saving operation.

[0155] 13 illustrates a procedure for a first device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0156] Referring to FIG. 13, in step S1310, a first device may establish a sidelink (SL) unicast link with a second device. In step S1320, the first device may transmit first SL discontinuous reception (DRX) configuration information related to the SL unicast link to the second device. In step S1330, the first device may transmit a physical sidelink control channel (PSCCH) to the second device during an on-duration period included in the first SL DRX configuration information. In step S1340, the first device may transmit a physical sidelink shared channel (PSSCH) to the second device based on the PSCCH during the on-duration period. For example, the first SL DRX configuration information is SL DRX configuration information set for each SL unicast link.

[0157] For example, the first device can further transmit SL terminal information to the base station.

[0158] For example, the SL terminal information may include second SL DRX setting information set from the first device.

[0159] For example, the first device may further receive the first SL DRX setting information from the base station. For example, the first SL DRX setting information is set based on the SL terminal information.

[0160] For example, the first SL DRX setting information may be the same as the second SL DRX setting information based on the first device failing to receive the first SL DRX setting information from the base station.

[0161] For example, the SL terminal information may include at least one of a frequency related to the SL unicast link, quality of service (QoS) information related to the PSSCH, information related to whether SL DRX operation is supported, or information related to whether SL hybrid automatic repeat request (HARQ) operation is supported.

[0162] For example, the DRX operation performed by the second device is performed based on the first SL DRX setting information.

[0163] For example, the DRX operation is performed based on the second device being in PC5 active mode.

[0164] For example, the first device may further instruct the second device to transition to the PC5 active mode via a SL DRX reconfiguration message, For example, the first device and the second device may transition to the PC5 active mode based on the SL DRX reconfiguration message.

[0165] For example, based on the establishment of the SL unicast link, the first device and the second device may transition to the PC5 active mode.

[0166] For example, the first device may further receive second SL DRX setting information from the second device, and may perform a DRX operation based on the second SL DRX setting information.

[0167] For example, the first SL DRX configuration information is transmitted to the second device via a SL DRX reconfiguration message.

[0168] For example, the PSCCH and the PSSCH are transmitted based on the first device being in a PC5 active mode.

[0169] The above-described embodiment is applicable to various devices described below. For example, the processor 102 of the first device 100 may establish a sidelink (SL) unicast link with the second device 200. The processor 102 of the first device 100 may control the transceiver 106 to transmit first SL discontinuous reception (DRX) configuration information related to the SL unicast link to the second device 200. The processor 102 of the first device 100 may control the transceiver 106 to transmit a physical sidelink control channel (PSCCH) to the second device 200 during an on-duration period included in the first SL DRX configuration information. The processor 102 of the first device 100 may control the transceiver 106 to transmit a physical sidelink shared channel (PSSCH) to the second device 200 based on the PSCCH during the on-duration period.

[0170] According to an embodiment of the present disclosure, a first device performing wireless communication is provided. For example, the first device may include one or more memories storing instructions, one or more transceivers, and one or more processors connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to establish a sidelink (SL) unicast link with a second device, transmit first SL discontinuous reception (DRX) setting information related to the SL unicast link to the second device, transmit a physical sidelink control channel (PSCCH) to the second device during an on-duration period included in the first SL DRX setting information, and transmit a physical sidelink shared channel (PSSCH) to the second device based on the PSCCH during the on-duration period, and the first SL DRX setting information may be SL DRX setting information set for each SL unicast link.

[0171] According to an embodiment of the present disclosure, an apparatus configured to control a first terminal is provided. For example, the apparatus may include one or more processors and one or more memories connected to be executed by the one or more processors and storing instructions. For example, the one or more processors execute the instructions to establish a sidelink (SL) unicast link with a second terminal, transmit first SL discontinuous reception (DRX) setting information related to the SL unicast link to the second terminal, transmit a physical sidelink control channel (PSCCH) to the second terminal in an on-duration period included in the first SL DRX setting information, and transmit a physical sidelink shared channel (PSSCH) to the second terminal based on the PSCCH in the on-duration period, where the first SL DRX setting information may be SL DRX setting information set for each SL unicast link.

[0172] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium having recorded thereon instructions is provided, which, when executed, cause a first device to establish a sidelink (SL) unicast link with a second device, transmit first SL discontinuous reception (DRX) configuration information related to the SL unicast link to the second device, transmit a physical sidelink control channel (PSCCH) to the second device during an on-duration period included in the first SL DRX configuration information, and transmit a physical sidelink shared channel (PSSCH) to the second device based on the PSCCH during the on-duration period, where the first SL DRX configuration information may be SL DRX configuration information set for each SL unicast link.

[0173] 14 illustrates a procedure for a second device to perform wireless communication according to an embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0174] Referring to FIG. 14, in step S1410, the second device may establish a sidelink (SL) unicast link with the first device. In step S1420, the second device may receive SL discontinuous reception (DRX) configuration information related to the SL unicast link from the first device. In step S1430, the second device may receive a physical sidelink control channel (PSCCH) from the first device during an on-duration period included in the SL DRX configuration information. In step S1440, the second device may receive a physical sidelink shared channel (PSSCH) from the first device based on the PSCCH during the on-duration period. For example, the SL DRX configuration information may be SL DRX configuration information set for each SL unicast link.

[0175] For example, the second device may further receive a SL DRX reconfiguration message from the first device and transition to a PC5 active mode based on the SL DRX reconfiguration message, for example, the SL DRX configuration information is received via the SL DRX reconfiguration message, and the PSCCH and the PSSCH are received based on the second device in the PC5 active mode.

[0176] The above-described embodiment is applicable to various devices described below. For example, the processor 202 of the second device 200 may establish a sidelink (SL) unicast link with the first device 100. The processor 202 of the second device 200 may control the transceiver 206 to receive SL discontinuous reception (DRX) configuration information related to the SL unicast link from the first device 100. The processor 202 of the second device 200 may control the transceiver 206 to receive a physical sidelink control channel (PSCCH) from the first device 100 during an on-duration period included in the SL DRX configuration information. The processor 202 of the second device 200 may control the transceiver 206 to receive a physical sidelink shared channel (PSSCH) from the first device 100 based on the PSCCH during the on-duration period.

[0177] According to an embodiment of the present disclosure, a second device performing wireless communication is provided. For example, the second device may include one or more memories storing instructions, one or more transceivers, and one or more processors connecting the one or more memories and the one or more transceivers. For example, the one or more processors execute the instructions to establish a sidelink (SL) unicast link with a first device, receive SL discontinuous reception (DRX) setting information related to the SL unicast link from the first device, receive a physical sidelink control channel (PSCCH) from the first device during an on-duration period included in the SL DRX setting information, and receive a physical sidelink shared channel (PSSCH) from the first device based on the PSCCH during the on-duration period, where the SL DRX setting information may be SL DRX setting information set for each SL unicast link.

[0178] For example, the one or more processors may further execute the instructions to receive a SL DRX reconfiguration message from the first device and transition to a PC5 active mode based on the SL DRX reconfiguration message, e.g., the SL DRX configuration information is received via the SL DRX reconfiguration message, and the PSCCH and the PSSCH are received based on the second device being in the PC5 active mode.

[0179] The various embodiments of the present disclosure may be intercombined.

[0180] Hereinafter, an apparatus to which various embodiments of the present disclosure can be applied will be described.

[0181] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow charts disclosed in this document may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0182] Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following drawings / description, the same reference numerals may represent the same or corresponding hardware blocks, software blocks, or function blocks, unless otherwise stated.

[0183] FIG. 15 illustrates a communication system 1 according to an embodiment of the present disclosure.

[0184] Referring to FIG. 15, a communication system 1 to which various embodiments of the present disclosure are applied includes a wireless device, a base station, and a network. Here, the wireless device means a device that performs communication using a wireless connection technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and is called a communication / wireless / 5G device. Without being limited thereto, the wireless device may include a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held device) 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing communication between vehicles, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (e.g., a drone). The XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and may be embodied in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. The mobile devices may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glasses), a computer (e.g., a notebook, etc.), etc. The home appliances may include a TV, a refrigerator, a washing machine, etc. The IoT devices may include a sensor, a smart meter, etc. For example, a base station and a network may be embodied as a wireless device, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0185] Here, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low power communication. At this time, for example, NB-IoT technology is an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Furthermore, or generally, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may perform communication based on LTE-M technology. At this time, as an example, LTE-M technology is an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. In addition, or in general, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN), which consider low power communication, and is not limited to the above names. As an example, Zigbee technology can generate personal area networks (PANs) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and is called by various names.

[0186] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. An AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an 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. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, but may also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Furthermore, an IoT device (eg, a sensor) can directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

[0187] Wireless communications / connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 200 and 200. Here, the wireless communication / connections may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul)). Through the wireless communication / connections 150a, 150b, and 150c, the wireless device and the base station / wireless device, and the base station and the base station may transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c may transmit / receive signals via various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0188] FIG. 16 illustrates a wireless device according to one embodiment of the present disclosure.

[0189] 16, a first wireless device 100 and a second wireless device 200 may transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} may correspond to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG. 15.

[0190] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may be configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver 106. The processor 102 may also receive a wireless signal including a second information / signal via the transceiver 106, and then store information obtained from signal processing of the second information / signal in the memory 104. The memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0191] The second wireless device 200 may include one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flow charts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate a third information / signal, and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including a fourth information / signal via the transceiver 206, and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver and may be mixed with an RF unit. In this disclosure, a wireless device may also refer to a communication modem / circuit / chip.

[0192] The hardware elements of the wireless devices 100, 200 are described in more detail below. Without being limited thereto, one or more protocol layers may be embodied by one or more processors 102, 202. For example, one or more processors 102, 202 may embody one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP, etc.). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information to the one or more transceivers 106, 206 according to the functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein.

[0193] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software configured to be executed by one or more processors 102, 202 or stored in one or more memories 104, 204 and run by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein may be implemented using firmware or software in the form of code, instructions and / or collections of instructions.

[0194] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0195] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flow diagrams, etc., herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and may be configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams, etc., disclosed herein via one or more antennas 108, 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, 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing the received user data, control information, radio signals / channels, etc., using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, radio signals / channels, etc., processed using one or more processors 102, 202, from baseband signals to RF band signals. To this end, one or more transceivers 106, 206 may include an (analog) oscillator and / or a filter.

[0196] FIG. 17 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure.

[0197] Referring to FIG. 17, 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. Without being limited thereto, the operations / functions of FIG. 17 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 16. The hardware elements of FIG. 17 may be embodied by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 16. For example, the blocks 1010 to 1060 may be embodied by the processors 102, 202 of FIG. 16. Also, the blocks 1010 to 1050 may be embodied by the processors 102, 202 of FIG. 16, and the block 1060 may be embodied by the transceivers 106, 206 of FIG. 16.

[0198] The codeword can be converted into a radio signal through the signal processing circuit 1000 of FIG. 17. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a transmission block of a UL-SCH, a transmission block of a DL-SCH). The radio signal can be transmitted through various physical channels (e.g., a PUSCH, a PDSCH).

[0199] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of the wireless device, etc. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. The modulation scheme may include pi / 2-BPSK (pi / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-Quadrature Amplitude Modulation), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to a corresponding antenna port by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by a precoding matrix W of N*M. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT transformation) on the complex modulation symbols. Also, the precoder 1040 may perform precoding without performing transform precoding.

[0200] The resource mapper 1050 can map the modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource can include a plurality of symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an Inverse Fast Fourier Transform (IFFT) module, a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, and the like.

[0201] In the wireless device, the signal processing process for the received signal may be configured in reverse to the signal processing processes 1010 to 1060 in FIG. 17. For example, the wireless device (e.g., 100, 200 in FIG. 16) may receive a wireless signal from the outside through an antenna port / transmitter / receiver. The received wireless signal may be converted to a baseband signal through a signal restorer. For this purpose, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0202] 18 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 15).

[0203] 18, the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 16 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 16. For example, the transceiver 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 16. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110, or store information received from an external device (e.g., another communication device) via a wireless / wired interface through the communication unit 110 in the memory unit 130.

[0204] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Without being limited thereto, the wireless device may be embodied in the form of a robot (100a in FIG. 15), a vehicle (100b-1, 100b-2 in FIG. 15), an XR device (100c in FIG. 15), a mobile device (100d in FIG. 15), a home appliance (100e in FIG. 15), an IoT device (100f in FIG. 15), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a Fintech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 15), a base station (200 in FIG. 15), a network node, or the like. The wireless device may be mobile or fixed depending on the use case / service.

[0205] In FIG. 18, various elements, components, units / parts, and / or modules in the wireless devices 100 and 200 may be interconnected entirely through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) may be wirelessly connected through the communication unit 110. Also, each element, component, unit / part, and / or module in the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured as a set of one or more processors. For example, the control unit 120 may be configured as a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0206] The embodiment of FIG. 18 will now be described in more detail with reference to other drawings.

[0207] 19 illustrates a mobile device according to an embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, a smart glasses), or a portable computer (e.g., a notebook, etc.). The mobile device may be called 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).

[0208] 19, the portable device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output 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 blocks 110 to 130 / 140 in FIG. 18, respectively.

[0209] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control components of the portable device 100 and perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data / parameters / programs / codes / commands required for operating the portable device 100. The memory unit 130 can also store input / output data / information, etc. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the portable device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive or output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0210] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to another wireless device or to a base station. In addition, the communication unit 110 may receive wireless signals from another wireless device or a base station, and then restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c.

[0211] 20 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0212] 20, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving 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 blocks 110 / 130 / 140 in FIG. 18, respectively.

[0213] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include wired / wireless charging circuits, batteries, etc. The sensor unit 140c can obtain vehicle status, surrounding 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, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a forward / reverse sensor of the vehicle, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0214] 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 route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving route according to the driving plan (e.g., speed / direction adjustment). During the autonomous driving, the communication unit 110 may non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from surrounding vehicles. Also, during the autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 may transmit information on the vehicle position, the autonomous driving route, the driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or the autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

[0215] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims of this specification may be combined and embodied in an apparatus, and the technical features of the device claims of this specification may be combined and embodied in a method. Furthermore, the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in an apparatus, and the technical features of the method claims and the technical features of the device claims of this specification may be combined and embodied in a method.

Claims

1. 1. A method for a first device to perform wireless communication, comprising: establishing a device-to-device unicast link with a second device; generating first device-to-device discontinuous reception setting information associated with the device-to-device unicast link based on the first device being unable to receive second device-to-device discontinuous reception setting information from a base station; transmitting the first inter-device discontinuous reception setting information to the second device; performing device-to-device transmission to the second device using the first device-to-device intermittent reception setting information; The method, wherein device-to-device discontinuous reception setting information is set for each device-to-device unicast link.

2. The method of claim 1 , further comprising the step of transmitting device-to-device terminal information to the base station.

3. The method according to claim 2 , wherein the inter-device terminal information includes the first inter-device discontinuous reception setting information.

4. The method of claim 2, wherein the device-to-device terminal information includes at least one of a frequency associated with the device-to-device unicast link, quality of service information associated with the device-to-device transmission, information related to whether device-to-device discontinuous reception operation is supported, or information related to whether device-to-device hybrid automatic repeat request operation is supported.

5. The method of claim 1 , wherein the discontinuous reception operation performed by the second device is performed based on the first inter-device discontinuous reception setting information.

6. The method of claim 5 , wherein the discontinuous reception operation is performed based on the second device being in a PC5 active mode.

7. The method further includes the step of instructing the second device to transition to the PC5 activation mode via an inter-device intermittent reception reconfiguration message; The method of claim 6 , wherein the first device and the second device transition to the PC5 activation mode based on the device-to-device discontinuous reception reconfiguration message.

8. The method of claim 6 , wherein upon the establishment of the device-to-device unicast link, the first device and the second device transition to the PC5 active mode.

9. The method of claim 1 , wherein the device-to-device transmission is performed based on approval of the first device-to-device discontinuous reception setting information.

10. The method of claim 9, further comprising: receiving a radio resource control reconfiguration completion inter-device message including information related to rejection from the second device based on the first inter-device discontinuous reception setting information being rejected.

11. The method of claim 1 , wherein the first device is unable to receive the second inter-device discontinuous reception setting information from the base station based on a connection between the first device and the base station not being established.

12. 1. A first device for performing wireless communication, comprising: one or more memories for storing instructions; one or more transceivers; one or more processors coupled to the one or more memories and the one or more transceivers; The one or more processors execute the instructions to establishing a device-to-device unicast link with the second device; generating first device-to-device discontinuous reception setting information associated with the device-to-device unicast link based on the first device being unable to receive second device-to-device discontinuous reception setting information from a base station; Transmitting the first inter-device discontinuous reception setting information to the second device; performing device-to-device transmission to the second device using the first device-to-device intermittent reception setting information; The first device, in which inter-device discontinuous reception setting information is set for each inter-device unicast link.

13. 1. An apparatus adapted to control a first user equipment (UE), comprising: The apparatus comprises: one or more processors; one or more memories operatively connected to the one or more processors and configured to store instructions; The one or more processors execute the instructions to Establishing a unicast link between the second UE and the UE; generating first inter-UE discontinuous reception setting information associated with the inter-UE unicast link based on the first UE being unable to receive second inter-UE discontinuous reception setting information from a base station; Transmitting the first inter-UE discontinuous reception setting information to the second UE; performing inter-UE transmission to the second UE using the first inter-UE discontinuous reception setting information; An apparatus, wherein inter-UE discontinuous reception setting information is configured for each inter-UE unicast link.

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