Method for transmitting and receiving side link signals in a wireless communication system

Abstract

One aspect of the present disclosure is a method for a user equipment in a wireless communication system, wherein a side link control signal is sent on an aggregated time slot including a plurality of time slots, and a first side link data signal and a second side link data signal are sent on the aggregated time slot based on the side link control signal. A priority set for the second side link data signal is higher than a priority set for the first side link data signal. A second time slot for sending the second side link data signal among the plurality of time slots is selected based on sensing information for selecting a first time slot for sending the first side link data signal among the plurality of time slots.

Description

Technical Field

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

[0002] Wireless access systems have been widely deployed to provide various types of communication services such as voice or data. Typically, wireless access systems are multiple access systems that support communication for multiple users by sharing available system resources (bandwidth, transmit power, etc.) between them. For example, multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and multi-carrier frequency division multiple access (MC-FDMA) systems, etc.

[0003] Wireless communication systems use various radio access technologies (RATs) such as Long Term Evolution (LTE), Advanced LTE (LTE-A), and Wireless Fidelity (WiFi). The fifth generation (5G) is such a wireless communication system. The three key requirement areas of 5G include: (1) enhanced mobile broadband (eMBB); (2) massive machine type communications (mMTC); and (3) ultra-reliable and low-latency communications (URLLC). Some use cases may require optimization in multiple dimensions, while others may only focus on one key performance indicator (KPI). 5G supports a variety of use cases in a flexible and reliable manner.

[0004] eMBB goes far beyond basic mobile internet access and encompasses rich interactive work, media and entertainment applications in the cloud or augmented reality (AR). Data is one of the key drivers of 5G, and for the first time in the 5G era, we may not see dedicated voice services. In 5G, voice is expected to be treated as an application simply using the data connectivity provided by the communication system. The main drivers of the increase in traffic are the increase in content size and the number of applications that require high data rates. As more and more devices are connected to the Internet, streaming services (audio and video), interactive video and mobile internet connections will continue to be more widely used. Many of these applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications for mobile communication platforms are increasing rapidly. This applies to both work and entertainment. Cloud storage is a special use case that drives the growth of uplink data rates. 5G will also be used for remote work in the cloud, which requires very low end-to-end latency to maintain a good user experience when operated with a tactile interface. Entertainment such as cloud gaming and video streaming is another major driver of the demand for mobile broadband capacity. In highly mobile environments including trains, cars and airplanes, entertainment anywhere will be critical for smartphones and tablets. Another use case is augmented reality (AR) for entertainment and information search, which requires very low latency and large amounts of real-time data.

[0005] One of the most anticipated 5G use cases is the ability to actively connect embedded sensors in various fields, i.e. mMTC. It is estimated that there will be 20.4 billion potential IoT devices by 2020. In the Industrial Internet of Things (IoT), 5G is one of the areas that will play a key role in realizing smart cities, asset tracking, smart utilities, agriculture, and secure infrastructure.

[0006] URLLC includes services that leverage ultra-reliable / available, low-latency links to transform industries such as remote control of critical infrastructure and autonomous vehicles. The level of reliability and latency is critical for smart grid control, industrial automation, robotics, drone control and coordination, etc.

[0007] Now, a number of use cases will be described in detail.

[0008] 5G can complement fiber to the home (FTTH) and cable-based broadband (or cable data service interface specification (DOCSIS)) as a means of providing streams at data rates of hundreds of megabits per second to gigabits per second. Such high speeds are needed for TV broadcasts with 4K (6K, 8K and higher) resolution or higher, as well as virtual reality (VR) and AR. VR and AR applications mainly include immersive sports games. Special network configurations may be required for specific applications. For example, for VR games, game companies may have to integrate core servers with network operators' edge network servers to minimize latency.

[0009] The automotive industry is expected to be a very important new driver of 5G, with many use cases in mobile communications for vehicles. For example, providing entertainment to passengers requires mobile broadband with both high capacity and high mobility, as future users will expect to continue to maintain high-quality connections regardless of location and speed. Other use cases in the automotive industry are AR dashboards. These AR dashboards display superimposed information on top of what the driver sees through the front window, identify objects in the dark, and inform the driver about the distance and movement of objects. In the future, wireless modules will enable communication between the vehicles themselves, between the vehicle and the supporting infrastructure, and between the vehicle and other connected devices (e.g., devices carried by pedestrians). Safety systems can guide drivers to take other courses of action to make them drive more safely and reduce the risk of accidents. The next stage will be remotely controlled or autonomous vehicles. These require very reliable and very fast communication between different autonomous vehicles and between vehicles and infrastructure. In the future, autonomous vehicles will perform all driving actions, while drivers will focus on elusive traffic anomalies in the vehicle itself. The technical requirements of autonomous vehicles call for ultra-low latency and ultra-high reliability, improving traffic safety to a level that humans cannot achieve.

[0010] Smart cities and smart homes (often referred to as smart societies) will be embedded with dense wireless sensor networks. Distributed intelligent sensor networks will identify conditions for cost-effective and energy-efficient maintenance of a city or home. A similar setup can be done for each home, with temperature sensors, window and heating controls, burglar alarms, and home appliances all connected wirelessly. Many of these sensors are typically characterized by low data rates, low power consumption, and low cost, but real-time high-definition (HD) video may be required in some types of monitoring installations, for example.

[0011] Energy consumption and distribution, including heat or gas, is becoming highly decentralized, which requires automated control of very decentralized sensor networks. Smart grids interconnect such sensors using digital information and communication technologies to collect and act upon information. This information can include information about the behavior of suppliers and consumers, allowing smart grids to improve the efficiency, reliability, economy, and sustainability of the production and distribution of fuels such as electricity in an automated manner. Smart grids can be seen as another sensor network with low latency.

[0012] The health sector has many applications that can benefit from mobile communications. Communication systems enable telemedicine, which provides healthcare services over long distances. It helps eliminate distance barriers and can improve access to medical services that are often not consistently available in remote rural communities. It can also be used to save lives in critical care and emergency situations. Wireless sensor networks based on mobile communications can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0013] Wireless and mobile communications are becoming increasingly important for industrial applications. Cables are expensive to install and maintain, and the possibility of replacing them with reconfigurable wireless links is an attractive opportunity for many industries. However, to achieve this, wireless connections need to have similar latency, reliability, and capacity as cables, and be easier to manage. Low latency and very low error rates are new requirements that 5G needs to address.

[0014] Finally, logistics and freight tracking are important use cases for mobile communications, which enable tracking of inventory and packages regardless of where they are by using location-based information systems. Logistics and freight tracking use cases typically require lower data rates but require wide coverage and reliable location information.

[0015] A wireless communication system is a multiple-access system that supports communication for multiple users by sharing available system resources (bandwidth, transmit power, etc.) Examples of multiple-access systems include CDMA systems, FDMA systems, TDMA systems, OFDMA systems, SC-FDMA systems, and MC-FDMA systems.

[0016] Sidelink (SL) refers to a communication scheme in which a direct link is established between user equipments (UEs) and the UEs directly exchange voice or data without intervention of a base station (BS). SL is considered a solution to relieve BS constraints on rapidly growing data traffic.

[0017] Vehicle-to-everything (V2X) is a communication technology in which a vehicle exchanges information with another vehicle, pedestrians, and infrastructure through wired / wireless communication. V2X can be classified into four types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication can be provided via a PC5 interface and / or a Uu interface.

[0018] As more and more communication devices require greater communication capacity, enhanced mobile broadband communication relative to existing RATs is needed. Therefore, communication systems that take into account services or UEs that are sensitive to reliability and latency are being discussed. The next generation RAT in which eMBB, MTC, and URLLC are considered is called new RAT or NR. In NR, V2X communication can also be supported.

[0019] Figure 1 This is a diagram illustrating a comparison between V2X communication based on a pre-NR RAT and V2X communication based on NR.

[0020] For V2X communication, the technology of providing safety services based on V2X messages such as Basic Safety Message (BSM), Collaborative Awareness Message (CAM) and Decentralized Environment Notification Message (DENM) is mainly discussed in the RAT before NR. V2X messages may include location information, dynamic information and attribute information. For example, a UE may send a CAM of a periodic message type and / or a DENM of an event-triggered type to another UE.

[0021] For example, the CAM may include basic vehicle information, including dynamic state information such as direction and speed, vehicle static data such as size, external lighting status, path details, etc. For example, the UE may broadcast a CAM that may have a latency of less than 100 ms. For example, when an unexpected event occurs, such as damage or an accident to a vehicle, the UE may generate a DENM and send the DENM to another UE. For example, all vehicles within the transmission range of the UE may receive the CAM and / or the DENM. In this case, the DENM may have a higher priority than the CAM.

[0022] Regarding V2X communication, various V2X scenarios are presented in NR. For example, V2X scenarios include vehicle platooning, advanced driving, extended sensors, and remote driving.

[0023] For example, vehicles can be dynamically grouped and travel together based on vehicle queues. For example, in order to perform queueing operations based on vehicle queues, the vehicles of the group can receive periodic data from the lead vehicle. For example, the vehicles of the group can widen or narrow their gaps based on the periodic data.

[0024] For example, vehicles can be semi-autonomous or fully automated based on advanced driving. For example, each vehicle can adjust trajectory or maneuver based on data obtained from nearby vehicles and / or nearby logical entities. For example, each vehicle can also share driving intent with nearby vehicles.

[0025] Based on the extended sensors, raw or processed data or live video data, for example, obtained by local sensors, can be exchanged between vehicles, logical entities, pedestrian terminals and / or V2X application servers. Thus, the vehicle can perceive a high-level environment relative to the environment perceivable by its sensors.

[0026] Based on remote driving, for example, a remote driver or V2X application can operate or control a remote vehicle on behalf of a person who cannot drive or in a dangerous environment. For example, when the path can be predicted to be in public transportation, cloud-based driving can be used to operate or control the remote vehicle. For example, access to a cloud-based backend service platform can also be used for remote driving.

[0027] Discussions are ongoing in NR-based V2X communications to specify service requirements for various V2X scenarios including vehicle platooning, advanced driving, extended sensors, and remote driving. Summary of the invention

[0028] Technical issues

[0029] Various embodiments of the present disclosure may provide a method of transmitting and receiving a signal in a wireless communication system and a device for supporting the method.

[0030] In detail, various embodiments of the present disclosure may provide a method for transmitting data having a high priority in an aggregated time slot in a wireless communication system and a device for supporting the method.

[0031] Those skilled in the art will recognize that the objectives that can be achieved by the present disclosure are not limited to the contents specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0032] Technical Solution

[0033] Various embodiments of the present disclosure may provide a method of transmitting and receiving a signal in a wireless communication system and a device for supporting the method.

[0034] According to one aspect of the present disclosure, a method for a user equipment (UE) in a wireless communication system includes: sending a side link control signal on an aggregated time slot, the aggregated time slot including a plurality of time slots; and sending a first side link data signal and a second side link data signal on the aggregated time slot based on the side link control signal, wherein a priority set for the second side link data signal is higher than a priority set for the first side link data signal, and a second time slot for sending the second side link data signal among the plurality of time slots is selected based on sensing information for selecting a first time slot for sending the first side link data signal among the plurality of time slots.

[0035] The sensing information may include at least one of a reference signal received power (RSRP), a channel busy rate (CBR), or a quality of service (QoS) measured in at least one time slot related to the first time slot.

[0036] At least one time slot may precede the first time slot in the time domain.

[0037] The first sidelink data signal scheduled on the second time slot may be dropped.

[0038] The sidelink control signal may be sent in each of the plurality of time slots.

[0039] Based on the fact that the transmission of the side link control signal in each of the multiple time slots is skipped, whether to schedule the second side link data signal can be based on the demodulation reference signal (DMRS) information of the physical side link shared channel (PSSCH) transmitted in the remaining time slots among the multiple time slots except the second time slot.

[0040] According to another aspect of the present disclosure, a device for a user equipment (UE) in a wireless communication system includes: at least one processor; and at least one memory, which is operably connected to the at least one processor and configured to store at least one instruction for allowing the at least one processor to perform operations, the operations including: sending a side link control signal on an aggregated time slot, the aggregated time slot including a plurality of time slots; and sending a first side link data signal and a second side link data signal on the aggregated time slot based on the side link control signal, wherein the priority set for the second side link data signal is higher than the priority set for the first side link data signal, and a second time slot for sending the second side link data signal among the plurality of time slots is selected based on sensing information for selecting a first time slot for sending the first side link data signal among the plurality of time slots.

[0041] The sensing information may include at least one of a reference signal received power (RSRP), a channel busy rate (CBR), or a quality of service (QoS) measured in at least one time slot related to the first time slot.

[0042] At least one time slot may precede the first time slot in the time domain.

[0043] The first sidelink data signal scheduled on the second time slot may be dropped.

[0044] Based on the fact that the transmission of the side link control signal in each of the multiple time slots is skipped, whether to schedule the second side link data signal can be based on the demodulation reference signal (DMRS) information of the physical side link shared channel (PSSCH) transmitted in the remaining time slots among the multiple time slots except the second time slot.

[0045] The UE may be an autonomous vehicle or be included in an autonomous vehicle.

[0046] Another aspect of the present disclosure provides a processor for performing operations of a user equipment (UE) in a wireless communication system, the operations including: sending a side link control signal on an aggregated time slot, the aggregated time slot including a plurality of time slots; and sending a first side link data signal and a second side link data signal on the aggregated time slot based on the side link control signal, wherein a priority set for the second side link data signal is higher than a priority set for the first side link data signal, and a second time slot among the plurality of time slots for sending the second side link data signal is selected based on sensing information for selecting a first time slot among the plurality of time slots for sending the first side link data signal.

[0047] Another aspect of the present disclosure provides a computer-readable recording medium for storing at least one computer program, the computer program including at least one instruction for allowing the at least one processor to perform operations of a user equipment (UE) when executed by the at least one processor, the operations including: sending a side link control signal on an aggregated time slot, the aggregated time slot including a plurality of time slots; and sending a first side link data signal and a second side link data signal on the aggregated time slot based on the side link control signal, wherein a priority set for the second side link data signal is higher than a priority set for the first side link data signal, and a second time slot for sending the second side link data signal among the plurality of time slots is selected based on sensing information for selecting a first time slot for sending the first side link data signal among the plurality of time slots.

[0048] The various examples of the present disclosure described above are only some of the exemplary examples of the present disclosure, and a person of ordinary skill in the art can derive and understand various examples to which technical features of various examples of the present disclosure are applied based on the detailed description.

[0049] Beneficial effects

[0050] Various embodiments of the present disclosure may have the following effects.

[0051] Various embodiments of the present disclosure may provide a method for transmitting data having a high priority in an aggregated time slot in a wireless communication system and a device for supporting the method.

[0052] Those skilled in the art will appreciate that the effects that can be achieved using the present disclosure are not limited to the effects that have been specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings are included to provide a further understanding of the present disclosure, and the accompanying drawings together with the detailed description provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings. The features disclosed in each of the accompanying drawings are combined with each other to form new embodiments. The reference numerals in each of the accompanying drawings correspond to structural elements.

[0054] Figure 1 is a diagram illustrating a comparison between vehicle-to-everything (V2X) communication based on a RAT before new radio access technology (NR) and V2X communication based on NR.

[0055] Figure 2 is a diagram illustrating a structure of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure.

[0056] Figure 3 is a diagram illustrating a user plane and a control plane radio protocol architecture according to an embodiment of the present disclosure.

[0057] Figure 4 is a diagram illustrating the structure of an NR system according to an embodiment of the present disclosure.

[0058] Figure 5 is a diagram illustrating the functional division between a next generation radio access network (NG-RAN) and a fifth generation core network (5GC) according to an embodiment of the present disclosure.

[0059] Figure 6 is a diagram illustrating a structure of an NR radio frame to which an embodiment of the present disclosure can be applied.

[0060] Figure 7 is a diagram illustrating a time slot structure in an NR frame according to an embodiment of the present disclosure.

[0061] Figure 8 is a diagram illustrating a radio protocol architecture for side link (SL) communication according to an embodiment of the present disclosure.

[0062] Fig. 9 is a diagram illustrating a radio protocol architecture for SL communication according to an embodiment of the present disclosure.

[0063] Fig.10is a diagram illustrating a structure of a secondary synchronization signal block (S-SSB) in a normal cyclic prefix (NCP) case according to an embodiment of the present disclosure.

[0064] Fig.11 is a diagram illustrating the structure of an S-SSB in the case of an extended cyclic prefix (ECP) according to an embodiment of the present disclosure.

[0065] Fig.12 is a diagram illustrating user equipment (UE) performing V2X communication or SL communication therebetween according to an embodiment of the present disclosure.

[0066] Fig.13 is a diagram illustrating a resource unit for V2X or SL communication according to an embodiment of the present disclosure.

[0067] Fig.14 is a diagram illustrating a signal flow of a V2X or SL communication process of a UE according to a transmission mode according to an embodiment of the present disclosure.

[0068] Fig.15 A plurality of BWPs according to embodiments of the present disclosure are illustrated.

[0069] Fig.16 A BWP according to an embodiment of the present disclosure is illustrated.

[0070] Fig.17 A resource unit for measuring a CRB according to an embodiment of the present disclosure is illustrated.

[0071] Fig.18 An example of a case where the PSCCH and the PSSCH are multiplexed is illustrated.

[0072] Fig.19 It is a diagram for explaining time slot aggregation.

[0073] Figure 20 to Figure 21 It is a diagram for explaining priority-based data transmission in time slot aggregation.

[0074] Fig. 22 is a flowchart of a method of transmitting a side link signal according to an example of the present disclosure.

[0075] Figure 23 to Figure 29 It is a block diagram illustrating various devices applicable to the embodiments of the present disclosure. DETAILED DESCRIPTION

[0076] In various embodiments of the present disclosure, " / " and "," should be interpreted as "and / or". For example, "A / B" may mean "A and / or B". In addition, "A, B" may mean "A and / or B". In addition, "A / B / C" may mean "at least one of A, B and / or C". In addition, "A, B, C" may mean "at least one of A, B and / or C".

[0077] In various embodiments of the present disclosure, "or" should be interpreted as "and / or". For example, "A or B" may include "only A", "only B" and / or "both A and B". In other words, "or" should be interpreted as "additionally or alternatively".

[0078] The technology described herein can be used for various wireless access 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 as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolution of IEEE802.16e, providing backward compatibility with systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) LTE is a part of Evolved UMTS (E-UMTS) using Evolved UTRA (E-UTRA). 3GPP LTE adopts OFDMA for downlink (DL) and SC-FDMA for uplink (UL). LTE-Advanced (LTE-A) is an evolution of 3GPP LTE.

[0079] As the successor to LTE-A, the fifth generation (5G) new radio access technology (NR) is a new clean-state mobile communication system characterized by high performance, low latency, and high availability. 5G NR can use all available spectrum resources including low frequency bands below 1 GHz, mid-frequency bands between 1 GHz and 10 GHz, and high (millimeter) frequency bands of 24 GHz or above.

[0080] Although the following description is mainly given in the context of LTE-A or 5G NR for clarity of description, the technical ideas of the embodiments of the present disclosure are not limited thereto.

[0081] Figure 2 The structure of the LTE system according to the embodiment of the present disclosure is illustrated. This may also be referred to as an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) or an LTE / LTE-A system.

[0082] Reference Figure 2 , E-UTRAN includes an evolved Node B (eNB) 20, which provides a control plane and a user plane to the UE 10. The UE may be fixed or mobile, and may also be referred to as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), or a wireless device. The eNB 20 is a fixed station that communicates with the UE, and may also be referred to as a base station (BS), a base transceiver system (BTS), or an access point.

[0083] The eNBs 20 may be connected to each other via an X2 interface. The eNBs 20 are connected to an Evolved Packet Core (EPC) 39 via an S1 interface. More specifically, the eNBs 20 are connected to a Mobility Management Entity (MME) via an S1-MME interface, and to a Serving Gateway (S-GW) via an S1-U interface.

[0084] The EPC 30 includes an MME, an S-GW, and a packet data gateway (P-GW). The MME has access information or capability information about the UE, which is mainly used for mobility management of the UE. The S-GW is a gateway having an E-UTRAN as an endpoint, and the P-GW is a gateway having a packet data network (PDN) as an endpoint.

[0085] Based on the lowest three layers of the open system interconnection (OSI) reference model known in communication systems, the radio protocol stack between the UE and the network can be divided into layer 1 (L1), layer 2 (L2), and layer 3 (L3). These layers are defined in pairs between the UE and the evolved UTRAN (E-UTRAN) for data transmission via the Uu interface. The physical (PHY) layer at L1 provides information transfer services on physical channels. The radio resource control (RRC) layer at L3 is used to control radio resources between the UE and the network. For this purpose, the RRC layer exchanges RRC messages between the UE and the eNB.

[0086] Figure 3 (a) illustrates a user plane radio protocol architecture according to an embodiment of the present disclosure.

[0087] Figure 3(b) illustrates a control plane radio protocol architecture according to an embodiment of the present disclosure. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

[0088] Reference Figure 3 (a) and Figure 3 (b) The PHY layer provides information transfer services to its upper layer on the physical channel. The PHY layer is connected to the medium access control (MAC) layer through a transport channel, and data is transferred between the MAC layer and the PHY layer on the transport channel. The transport channel is divided according to the characteristics of the data transmitted via the radio interface.

[0089] Data is transmitted on a physical channel between different PHY layers (ie, the PHY layers of a transmitter and a receiver). The physical channel may be modulated by Orthogonal Frequency Division Multiplexing (OFDM) and use time and frequency as radio resources.

[0090] The MAC layer provides services to the higher layer, Radio Link Control (RLC), on logical channels. The MAC layer provides the function of mapping from multiple logical channels to multiple transport channels. In addition, the MAC layer provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transmission services on logical channels.

[0091] The RLC layer performs concatenation, segmentation, and reassembly of RLC service data units (SDUs). In order to guarantee various quality of service (QoS) requirements for each radio bearer (RB), the RLC layer provides three operation modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

[0092] The RRC layer is defined only in the control plane and controls logical channels, transport channels, and physical channels related to the configuration, reconfiguration, and release of RBs. RBs refer to logical paths for data between UEs and networks provided by L1 (PHY layer) and L2 (MAC layer, RLC layer, and Packet Data Convergence Protocol (PDCP) layer).

[0093] The user plane functions of the PDCP layer include user data transmission, header compression and encryption. The control plane functions of the PDCP layer include control plane data transmission and encryption / integrity protection.

[0094] RB establishment is equivalent to the process of defining radio protocol layers and channel characteristics and configuring specific parameters and operation methods in order to provide specific services. RBs can be classified into two types: signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs are used as a path for sending RRC messages on the control plane, while DRBs are used as a path for sending user data on the user plane.

[0095] Once an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is placed in the RRC_CONNECTED state, otherwise, the UE is placed in the RRC_IDLE state. In NR, the RRC_INACTIVE state is additionally defined. A UE in the RRC_INACTIVE state can maintain a connection to the core network while releasing a connection with the eNB.

[0096] The DL transport channels that carry data from the network to the UE include a broadcast channel (BCH) on which system information is sent and a DL shared channel (DL SCH) on which user traffic or control messages are sent. Traffic or control messages for DL ​​multicast or broadcast services may be sent on a DL-SCH or a DL multicast channel (DL MCH). The UL transport channels that carry data from the UE to the network include a random access channel (RACH) on which initial control messages are sent and a UL shared channel (UL SCH) on which user traffic or control messages are sent.

[0097] The above-mentioned logical channels mapped to the transport channels include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH) and a multicast traffic channel (MTCH).

[0098] A physical channel includes multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A subframe includes multiple OFDM symbols in the time domain. An RB is a resource allocation unit defined by multiple OFDM symbols and multiple subcarriers. In addition, each subframe may use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) in a corresponding subframe for a physical DL control channel (PDCCH) (i.e., L1 / L2 control channel). A transmission time interval (TTI) is a unit time for subframe transmission.

[0099] Figure 4 The structure of the NR system according to an embodiment of the present disclosure is illustrated.

[0100] Reference Figure 4 , the next generation radio access network (NG-RAN) may include next generation Node Bs (gNBs) and / or eNBs, which provide user plane and control plane protocol terminations to the UE. Figure 4In the embodiment, it is shown by way of example that NG-RAN includes only gNB. gNB and eNB are connected to each other via Xn interface. gNB and eNB are connected to 5G core network (5GC) via NG interface. More specifically, gNB and eNB are connected to access and mobility management function (AMF) via NG-C interface and to user plane function (UPF) via NG-U interface.

[0101] Figure 5 The functional division between NG-RAN and 5GC according to an embodiment of the present disclosure is illustrated.

[0102] Reference Figure 5 , gNB can provide functions including inter-cell radio resource management (RRM), radio admission control, measurement configuration and provision, and dynamic resource allocation. AMF can provide functions such as non-access stratum (NAS) security and idle state mobility processing. UPF can provide functions including mobility anchoring and protocol data unit (PDU) processing. Session management function (SMF) can provide functions including UE Internet Protocol (IP) address allocation and PDU session control.

[0103] Figure 6 The radio frame structure in NR to which the embodiments of the present disclosure can be applied is illustrated.

[0104] Reference Figure 6 , a radio frame can be used for UL transmission and DL transmission in NR. A radio frame is 10ms in length and can be defined by two 5-ms half-frames. HF may include five 1-ms subframes. A subframe may be divided into one or more slots, and the number of slots in a SF may be determined according to a subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP).

[0105] In the case of normal CP (NCP), each time slot may include 14 symbols, and in the case of extended CP (ECP), each time slot may include 12 symbols. In this article, the symbol may be an OFDM symbol (or CP-OFDM symbol) or an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0106] Table 1 below lists the number of symbols per time slot (N) according to the SCS configuration (μ) in the case of NCP. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0107] [Table 1]

[0108] <![CDATA[SCS(15*2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot <!-- 8 -->]]> 15KHz(μ=0) 14 10 1 30kHz(μ=1) 14 20 2 60kHz(μ=2) 14 40 4 120kHz(μ=3) 14 80 8 240kHz(μ=4) 14 160 16

[0109] Table 2 shows the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS in the case of ECP.

[0110] [Table 2]

[0111] SCS(15*2^u) <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 60KHz(μ=2) 12 40 4

[0112] In the NR system, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) may be configured for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (collectively referred to as a time unit (TU) for convenience) comprising the same number of symbols (e.g., subframes, time slots, or TTIs) may be configured to be different for the aggregated cells.

[0113] In NR, various parameter sets or SCS can be supported to support various 5G services. For example, for SCS of 15kHz, a wide range in the traditional cellular band can be supported, while for SCS of 30kHz / 60kHz, dense urban areas, lower latency and wide carrier bandwidth can be supported. For SCS of 60kHz or higher, bandwidth greater than 24.25GHz can be supported to overcome phase noise.

[0114] The NR frequency band can be defined by two types of frequency ranges FR1 and FR2. The numerical value in each frequency range can be changed. For example, two types of frequency ranges can be given in [Table 3]. In the NR system, FR1 can be a "lower than 6 GHz range", and FR2 can be a "higher than 6 GHz range" called millimeter wave (mmW).

[0115] [Table 3]

[0116] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0117] As described above, the numerical value of the frequency range in the NR system can be changed. For example, as listed in [Table 4], FR1 can be in the range of 410 MHz to 7125 MHz. That is, FR1 can include frequency bands of 6 GHz (or 5850, 5900, and 5925 MHz) or above. For example, frequency bands of 6 GHz (or 5850, 5900, and 5925 MHz) or above can include unlicensed frequency bands. Unlicensed frequency bands can be used for various purposes, for example, vehicle communications (e.g., autonomous driving).

[0118] [Table 4]

[0119] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0120] Figure 7 The time slot structure in the NR frame according to an embodiment of the present disclosure is illustrated.

[0121] Reference Figure 7 , a time slot includes multiple symbols in the time domain. For example, a time slot may include 14 symbols in the NCP case and 12 symbols in the ECP case. Alternatively, a time slot may include 7 symbols in the NCP case and 6 symbols in the ECP case.

[0122] A carrier includes multiple subcarriers in the frequency domain. An RB may be defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) may be defined by multiple consecutive (physical) RBs ((P)RBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication may be performed in an activated BWP. Each element may be referred to as a resource element (RE) in a resource grid, and a complex symbol may be mapped to the resource element.

[0123] The radio interface between UEs or the radio interface between UE and the network may include L1, L2 and L3. In various embodiments of the present disclosure, L1 may refer to a PHY layer. For example, L2 may refer to at least one of a MAC layer, an RLC layer, a PDCP layer or an SDAP layer. For example, L3 may refer to an RRC layer.

[0124] Now, a description will be given of side link (SL) communication.

[0125] Figure 8 The radio protocol architecture for SL communication according to an embodiment of the present disclosure is illustrated. Specifically, Figure 8 (a) illustrates a user plane protocol stack in LTE, and Figure 8 (b) illustrates the control plane protocol stack in LTE.

[0126] Fig. 9 The radio protocol architecture for SL communication according to an embodiment of the present disclosure is illustrated. Specifically, Fig. 9 (a) illustrates the user plane protocol stack in NR, and Fig. 9 (b) illustrates the control plane protocol stack in NR.

[0127] The side link synchronization signal (SLSS) and synchronization information will be described below.

[0128] The SLSS as a SL specific sequence may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS). The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a gold sequence of length 127 may be used for the S-SSS. For example, the UE may detect an initial signal and acquire synchronization through the S-PSS. For example, the UE may acquire fine synchronization and detect a synchronization signal ID through the S-PSS and the S-SSS.

[0129] The physical side link broadcast channel (PSBCH) can be a (broadcast) channel that carries basic (system) information that the UE needs to know first before sending and receiving SL signals. For example, the basic information may include information related to SLSS, duplex mode (DM) information, time division duplex (TDD) UL / DL (UL / DL) configuration information, resource pool related information, information about the type of application related to SLSS, subframe offset information, broadcast information, etc. For example, the payload size of the PSBCH can be 56 bits, which includes a 24-bit cyclic redundancy check (CRC) for evaluating the PSBCH performance in NR V2X.

[0130] S-PSS, S-SSS and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SL SS) / PSBCH block, hereinafter referred to as sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth of the S-SSB can be within the (pre) configured SL BWP. For example, the bandwidth of the S-SSB can be 11 RBs. For example, the PSBCH can span 11 RBs. The frequency position of the S-SSB can be (pre-) set. Therefore, the UE does not need to perform hypothetical detection on frequency to discover the S-SSB in the carrier.

[0131] In the NR SL system, multiple parameter sets including different SCS and / or CP lengths can be supported. As the SCS increases, the length of the UE's time resources for S-SSB transmission can be shortened. Therefore, in order to ensure the coverage of the S-SSB, the sending UE can send one or more S-SSBs to the receiving terminal within one S-SSB transmission period according to the SCS. For example, the number of S-SSBs sent by the transmitting terminal to the receiving terminal within one S-SSB transmission period can be pre-configured or configured for the sending UE. For example, the S-SSB transmission period can be 160ms. For example, for all SCSs, an S-SSB transmission period of 160ms can be supported.

[0132] For example, when the SCS in FR1 is 15kHz, the transmitting UE can send one or two S-SSBs to the receiving UE in one S-SSB transmission period. For example, when the SCS in FR1 is 30kHz, the transmitting UE can send one or two S-SSBs to the receiving UE in one S-SSB transmission period. For example, when the SCS in FR1 is 60kHz, the transmitting UE can send one, two, or four S-SSBs to the receiving UE in one S-SSB transmission period.

[0133] For example, when the SCS in FR2 is 60kHz, the transmitting UE can send 1, 2, 4, 8, 16 or 32 S-SSBs to the receiving UE in one S-SSB transmission period. For example, when the SCS in FR2 is 120kHz, the transmitting UE can send 1, 2, 4, 8, 16, 32 or 64 S-SSBs to the receiving UE in one S-SSB transmission period.

[0134] When the SCS is 60kHz, two types of CP can be supported. In addition, the structure of the S-SSB sent by the transmitting UE to the receiving UE may be different according to the CP type. For example, the CP type may be NCP or ECP. Specifically, for example, when the CP type is NCP, the number of symbols mapped to the PSBCH in the S-SSB sent by the transmitting UE may be 9 or 8. On the other hand, for example, when the CP type is ECP, the number of symbols mapped to the PSBCH in the S-SSB sent by the transmitting UE may be 7 or 6. For example, the PSBCH may be mapped to the first symbol in the S-SSB sent by the transmitting UE. For example, after receiving the S-SSB, the receiving UE may perform an automatic gain control (AGC) operation in the first symbol period of the S-SSB.

[0135] Fig.10 The structure of S-SSB in the case of NCP according to an embodiment of the present disclosure is illustrated.

[0136] For example, when the CP type is NCP, the structure of the S-SSB (i.e., the order of symbols to which the S-PSS, S-SSS, and PSBCH in the S-SSB transmitted by the transmitting UE are mapped) may refer to Fig.10 .

[0137] Fig.11 The structure of S-SSB in the case of ECP according to an embodiment of the present disclosure is illustrated.

[0138] In the ECP case, for example, with Fig.10 Differently, the number of symbols to which the PSBCH is mapped after the S-SSS in the S-SSB may be 6. Therefore, the coverage of the S-SSB may be different depending on whether the CP type is NCP or ECP.

[0139] Each SLSS may have a sidelink synchronization identifier (SLSSID).

[0140] For example, in LTE SL or LTE V2X, the value of SLSSID may be defined based on a combination of two different S-PSS sequences and 168 different S-SSS sequences. For example, the number of SLSSIDs may be 336. For example, the value of SLSSID may be any one of 0 to 335.

[0141] For example, in NR SL or NR V2X, the value of SLSSID can be defined based on a combination of two different S-PSS sequences and 336 different S-SSS sequences. For example, the number of SLSSIDs can be 672. For example, the value of SLSSID can be any one of 0 to 671. For example, one of two different S-PSSs can be associated with in-coverage and the other S-PSS can be associated with out-of-coverage. For example, SLSS IDs from 0 to 335 can be used for in-coverage, and SLSSIDs from 336 to 671 can be used for out-of-coverage.

[0142] In order to improve the S-SSB reception performance of the receiving UE, the transmitting UE needs to optimize the transmission power according to the characteristics of each signal included in the S-SSB. For example, the transmitting UE can determine the maximum power reduction (MPR) value for each signal included in the S-SSB according to the peak-to-average power ratio (PAPR) of the signal. For example, when the PAPR values ​​between the S-PSS and the S-SSS in the S-SSB are different, the transmitting UE can apply the optimal MPR value to each of the S-PSS and the S-SSS to improve the S-SSB reception performance of the receiving UE. For example, a transition period can also be applied so that the transmitting UE performs an amplification operation on each signal. The transition period can reserve the time required for the transmitting end amplifier of the transmitting UE to perform normal operation at the boundary where the transmit power of the transmitting UE changes. For example, the transition period can be 10us in FR1 and 5us in FR2. For example, the search window for the receiving UE to detect the S-PSS can be 80ms and / or 160ms.

[0143] Fig.12 UEs performing V2X communication or SL communication therebetween according to an embodiment of the present disclosure are illustrated.

[0144] Reference Fig.12 , the term "UE" in V2X or SL communication may mainly refer to a user's terminal. However, when a network device such as a BS transmits and receives signals according to a UE-to-UE communication scheme, the BS may also be considered as a type of UE. For example, a first UE (UE1) may be a first device 100, and a second UE (UE2) may be a second device 200.

[0145] For example, UE1 may select a resource unit corresponding to a specific resource in a resource pool as a set of resources. UE1 may then send an SL signal in the resource unit. For example, UE2 as a receiving UE may be configured with a resource pool in which UE1 may send a signal, and detect a signal from UE1 in the resource pool.

[0146] When UE1 is within the coverage of the BS, the BS may indicate the resource pool to UE1. On the contrary, when UE1 is out of the coverage of the BS, another UE may indicate the resource pool to UE1, or UE1 may use a predetermined resource pool.

[0147] Generally, a resource pool may include a plurality of resource units, and each UE may select one or more resource units and transmit a SL signal in the selected resource units.

[0148] Fig.13 A resource unit for V2X or SL communication according to an embodiment of the present disclosure is illustrated.

[0149] Reference Fig.13 , the total frequency resources of the resource pool can be divided into NF frequency resources, and the total time resources of the resource pool can be divided into NT time resources. Therefore, a total of NF*NT resource units can be defined in the resource pool. Fig.13 An example is illustrated in which the resource pool is repeated with a period of NT subframes.

[0150] like Fig.13 As shown, a resource unit (e.g., unit #0) may be repeated periodically. Alternatively, in order to achieve a diversity effect in the time domain or frequency domain, the index of the physical resource unit to which a logical resource unit is mapped may vary over time in a predetermined pattern. In the resource unit structure, a resource pool may refer to a collection of resource units that a UE can use to transmit SL signals.

[0151] Resource pools can be divided into several types. For example, each resource pool can be classified as follows based on the content of the SL signal sent in the resource pool.

[0152] (1) Scheduling Assignment (SA) may be a signal including information about the location of resources for transmitting the SL data channel, modulation and coding scheme (MCS) or multiple-input multiple-output (MIMO) transmission scheme required for UE transmission data channel demodulation, timing advance (TA), etc. SA may be multiplexed with SL data in the same resource unit. In this case, the SA resource pool may refer to a resource pool in which SA is multiplexed with SL data for transmission. SA may be referred to as an SL control channel.

[0153] (2) The SL data channel (PSSCH) can be a resource pool used for sending user data from a sending UE. When SA and SL data are multiplexed in the same resource unit, only the SL data channel other than the SA information can be sent in the resource pool used for the SL data channel. In other words, the RE used to send SA information in a single resource unit in the SA resource pool can still be used to send SL data in the resource pool of the SL data channel. For example, the sending UE can send the PSSCH by mapping the PSSCH to consecutive PRBs.

[0154] (3) The discovery channel may be a resource pool for a transmitting UE to transmit information such as its ID. The transmitting UE may enable neighboring UEs to discover itself on the discovery channel.

[0155] Even when the SL signal has the same content as described above, different resource pools may be used according to the transmission / reception properties of the SL signal. For example, although the SL data channel or discovery message is the same, different resource pools may be used for the SL signal according to the transmission timing determination scheme of the SL signal (for example, whether the SL signal is transmitted at the reception time of the synchronization reference signal (RS) or at the time obtained by applying the predetermined TA to the reception time), the resource allocation scheme of the SL signal (for example, whether the BS allocates transmission resources of separate signals to separate transmitting UEs or whether a single transmitting UE selects its own single signal transmission resource in the resource pool), the signal format of the SL signal (for example, the number of symbols occupied by each SL signal in one subframe, or the number of subframes used to transmit one SL signal), the strength of the signal from the BS, the transmission power of the SL UE, etc.

[0156] Resource allocation in SL will be described below.

[0157] Fig.14 The process of performing V2X or SL communication according to the transmission mode in the UE according to the embodiment of the present disclosure is illustrated. In various embodiments of the present disclosure, the transmission mode may also be referred to as a mode or a resource allocation mode. For ease of description, the transmission mode in LTE may be referred to as the LTE transmission mode, and the transmission mode in NR may be referred to as the NR resource allocation mode.

[0158] For example, Fig.14 (a) illustrates UE operation related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Fig.14 (a) illustrates UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0159] For example, Fig.14 (b) illustrates UE operation related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Fig.14 (b) illustrates UE operations associated with NR resource allocation mode 2.

[0160] Reference Fig.14(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the BS can schedule SL resources for SL transmission of the UE. For example, the BS can perform resource scheduling for UE1 through PDCCH (more specifically, DL control information (DCI)), and UE1 can perform V2X or SL communication with UE2 according to the resource scheduling. For example, UE1 can send side link control information (SCI) to UE2 on PSCCH, and then send data to UE2 based on SCI on PSSCH.

[0161] For example, in NR resource allocation mode 1, resources for one or more SL transmissions of one transport block (TB) can be provided or allocated to the UE through a dynamic grant from the BS. For example, the BS can provide the UE with resources for transmitting PSCCH and / or PSSCH through a dynamic grant. For example, the transmitting UE can report to the BS the SL hybrid automatic repeat request (SL HARQ) feedback received from the receiving UE. In this case, the timing and PUCCH resources for reporting the SL HARQ feedback to the BS can be determined based on the indication in the PDCCH, and the BS allocates resources for SL transmission through it.

[0162] For example, the DCI may indicate a time slot offset between DCI reception and the first SL transmission scheduled by the DCI.For example, the minimum gap between the DCI scheduling SL transmission resources and the resources of the first scheduled SL transmission may not be less than the processing time of the UE.

[0163] For example, in NR resource allocation mode 1, the UE may be periodically provided or allocated a resource set for multiple SL transmissions through a configured grant from the BS. For example, the grant to be configured may include a configured grant type 1 or a configured grant type 2. For example, the UE may determine a TB to be sent in each opportunity indicated by a given configured grant.

[0164] For example, the BS may allocate SL resources to the UE in the same carrier or in different carriers.

[0165] For example, the NR gNB may control LTE-based SL communication. For example, the NR gNB may send NR DCI to the UE to schedule LTE SL resources. In this case, for example, a new RNTI may be defined to scramble the NR DCI. For example, the UE may include an NR SL module and an LTE SL module.

[0166] For example, after a UE including an NR SL module and an LTE SL module receives an NR SL DCI from a gNB, the NR SL module may convert the NR SL DCI to an LTE DCI type 5A and send the LTE DCI type 5A to the LTE SL module every X ms. For example, after the LTE SL module receives the LTE DCI format 5A from the NR SL module, the LTE SL module may activate and / or release the first LTE subframe after Z ms. For example, X may be dynamically indicated by a field of the DCI. For example, the minimum value of X may be different depending on the UE capabilities. For example, the UE may report a single value based on its UE capabilities. For example, X may be a positive number.

[0167] Reference Fig.14 (b), in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources from the SL resources pre-configured or configured by the BS / network. For example, the pre-configured or configured SL resources can be a resource pool. For example, the UE can autonomously select or schedule SL transmission resources. For example, the UE can select resources in the configured resource pool by itself, and perform SL communication in the selected resources. For example, the UE can select resources within the selection window by itself through a sensing and resource (re)selection process. For example, sensing can be performed on a sub-channel basis. UE1, which has autonomously selected resources in the resource pool, can send SCI to UE2 on PSCCH, and then send data to UE2 based on SCI on PSSCH.

[0168] For example, a UE may assist another UE in SL resource selection. For example, in NR resource allocation mode 2, a UE may be configured with a grant for SL transmission configuration. For example, in NR resource allocation mode 2, a UE may schedule SL transmission for another UE. For example, in NR resource allocation mode 2, a UE may reserve SL resources for blind retransmission.

[0169] For example, in NR resource allocation mode 2, UE1 may indicate the priority of SL transmission to UE2 via SCI. For example, UE2 may decode SCI and perform sensing and / or resource (re)selection based on priority. For example, the resource (re)selection process may include identifying candidate resources by UE2 in a resource selection window and selecting resources for (re)transmission by UE2 from the identified candidate resources. For example, the resource selection window may be a time interval during which the UE selects resources for SL transmission. For example, after UE2 triggers resource (re)selection, the resource selection window may start at T1≥0 and may be limited to the remaining packet delay budget of UE2. For example, when the SCI received by the second UE from UE1 indicates a specific resource and the L1 SL reference signal received power (RSRP) measurement of the specific resource exceeds the SL RSRP threshold in the step of UE2 identifying the candidate resource in the resource selection window, UE2 may not determine the specific resource as a candidate resource. For example, the SL RSRP threshold may be determined based on the priority of SL transmission indicated by the SCI received by UE2 from UE1 and the priority of SL transmission in the resource selected by UE2.

[0170] For example, the L1 SL RSRP may be measured based on the SL demodulation reference signal (DMRS). For example, one or more PSSCH DMRS patterns may be configured or pre-configured for each resource pool in the time domain. For example, PDSCH DMRS configuration type 1 and / or type 2 may be the same or similar to the PSSCH DMRS pattern in the frequency domain. For example, the exact DMRS pattern may be indicated by the SCI. For example, in NR resource allocation mode 2, the transmitting UE may select a specific DMRS pattern from the DMRS patterns configured or pre-configured for the resource pool.

[0171] For example, in NR resource allocation mode 2, the transmitting UE may perform initial transmission of a TB without reservation based on the sensing and resource (re)selection process. For example, the transmitting UE may reserve SL resources for initial transmission of a second TB using the SCI associated with the first TB based on the sensing and resource (re)selection process.

[0172] For example, in NR resource allocation mode 2, the UE may reserve resources for feedback-based PSSCH retransmissions through signaling associated with a previous transmission of the same TB. For example, the maximum number of SL resources reserved for a transmission including the current transmission may be 2, 3, or 4. For example, the maximum number of SL resources may be the same regardless of whether HARQ feedback is enabled. For example, the maximum number of HARQ (re)transmissions for a TB may be limited by configuration or pre-configuration. For example, the maximum number of HARQ (re)transmissions may be up to 32. For example, if there is no configuration or pre-configuration, the maximum number of HARQ (re)transmissions may be unspecified. For example, the configuration or pre-configuration may be used to send the UE. For example, in NR resource allocation mode 2, HARQ feedback for releasing resources not used by the UE may be supported.

[0173] For example, in NR resource allocation mode 2, the UE may indicate to another UE via SCI one or more subchannels and / or time slots used by the UE. For example, the UE may indicate to another UE via SCI one or more subchannels and / or time slots reserved by the UE for PSSCH (re)transmission. For example, the minimum allocation unit of SL resources may be a time slot. For example, the size of the subchannel may be configured or preconfigured for the UE.

[0174] SCI will be described below.

[0175] While control information sent from a BS to a UE on a PDCCH is referred to as DCI, control information sent from one UE to another UE on a PSCCH may be referred to as SCI. For example, the UE may know the starting symbol of the PSCCH and / or the number of symbols in the PSCCH before decoding the PSCCH. For example, the SCI may include SL scheduling information. For example, a UE may send at least one SCI to another UE to schedule a PSSCH. For example, one or more SCI formats may be defined.

[0176] For example, a transmitting UE may send an SCI on a PSCCH to a receiving UE. A receiving UE may decode an SCI to receive a PSSCH from the transmitting UE.

[0177] For example, a transmitting UE may send two consecutive SCIs (e.g., 2-stage SCIs) to a receiving UE on a PSCCH and / or a PSSCH. A receiving UE may decode two consecutive SCIs (e.g., 2-stage SCIs) to receive a PSSCH from a transmitting UE. For example, when the SCI configuration field is divided into two groups in consideration of a (relatively) large SCI payload size, an SCI including a first SCI configuration field group is referred to as a first SCI. An SCI including a second SCI configuration field group may be referred to as a second SCI. For example, a transmitting UE may send a first SCI to a receiving UE on a PSCCH. For example, a transmitting UE may send a second SCI to a receiving UE on a PSCCH and / or a PSSCH. For example, a second SCI may be sent to a receiving UE on a (standalone) PSCCH or on a PSSCH where the second SCI is piggybacked to data. For example, two consecutive SCIs may be applied to different transmissions (e.g., unicast, broadcast, or multicast).

[0178] For example, the sending UE may send all or part of the following information to the receiving UE via the SCI. For example, the sending UE may send all or part of the following information to the receiving UE via the first SCI and / or the second SCI.

[0179] -PSSCH-related and / or PSCCH-related resource allocation information, such as the location / number of time / frequency resources, resource reservation information (e.g. period), and / or

[0180] -SL channel state information (CSI) report request indicator or SL (L1) RSRP (and / or SL (L1) reference signal received quality (RSRQ) and / or SL (L1) received signal strength indicator (RSSI)) report request indicator, and / or

[0181] -SL CSI transmission indicator (on PSSCH) (or SL (L1) RSRP (and / or SL (L1) RSRQ and / or SL (L1) RSSI) information transmission indicator), and / or

[0182] -MCS information, and / or

[0183] - transmit power information, and / or

[0184] - L1 destination ID information and / or L1 source ID information, and / or

[0185] -SL HARQ process ID information, and / or

[0186] - New Data Indicator (NDI) information, and / or

[0187] - Redundancy Version (RV) information, and / or

[0188] - QoS information (related to the transport service / packet), e.g. priority information, and / or

[0189] - SL CSI-RS transmission indicator or information about the number of SL CSI-RS antenna ports (to be transmitted);

[0190] - location information about the sending UE or location (or distance zone) information about the target receiving UE (requested to send SL HARQ feedback), and / or

[0191] - RS (e.g., DMRS, etc.) information related to decoding and / or channel estimation of data transmitted on the PSSCH, for example, information related to the pattern of (time-frequency) mapping resources of the DMRS, rank information, and antenna port index information.

[0192] For example, the first SCI may include information related to channel sensing. For example, the receiving UE may decode the second SCI using PSSCH DMRS. The polarization code used for PDCCH may be applied to the second SCI. For example, for unicast, groupcast, and broadcast in a resource pool, the payload size of the first SCI may be equal. After decoding the first SCI, the receiving UE does not need to perform blind decoding on the second SCI. For example, the first SCI may include scheduling information about the second SCI.

[0193] In various embodiments of the present disclosure, since the transmitting UE can send at least one of the SCI, the first SCI, or the second SCI to the receiving UE on the PSCCH, the PSCCH can be replaced with at least one of the SCI, the first SCI, or the second SCI. Additionally or alternatively, for example, the SCI can be replaced with at least one of the PSCCH, the first SCI, or the second SCI. Additionally or alternatively, for example, since the transmitting UE can send the second SCI to the receiving UE on the PSSCH, the PSSCH can be replaced with the second SCI.

[0194] Now, a description will be given of CAM and DENM.

[0195] In V2V communication, CAM of periodic message type and DENM of event-triggered message type can be sent. CAM may include basic vehicle information such as dynamic information about the vehicle (such as direction and speed), vehicle static data (such as size), external lighting conditions, route details, etc. The length of CAM can be 50 to 300 bytes. CAM is broadcast and has a latency requirement of less than 100ms. DENM can be a message generated in an emergency situation (such as vehicle damage or an accident). DENM can be shorter than 3000 bytes and can be received on any vehicle within the transmission range. DENM can have a higher priority than CAM.

[0196] Carrier reselection will be described below.

[0197] In V2X or SL communication, the UE may perform carrier reselection based on the channel busy rate (CBR) of the configured carrier and / or the PPPP of the V2X message to be sent. For example, carrier reselection may be performed at the MAC layer of the UE. In various embodiments of the present disclosure, PPPP and ProSe per-packet reliability (PPPR) may be used interchangeably with each other. For example, as the PPPP value is smaller, this may mean a higher priority, and as the PPPP value is larger, this may mean a lower priority. For example, as the PPPR value is smaller, this may mean a higher reliability, and as the PPPR value is larger, this may mean a lower reliability. For example, a PPPP value associated with a service, packet, or message having a higher priority may be less than a PPPP value associated with a service, packet, or message having a lower priority. For example, a PPPR value associated with a service, packet, or message having a higher reliability may be less than a PPPR value associated with a service, packet, or message having a lower reliability.

[0198] CBR may refer to the portion of the subchannels in the resource pool where the sidelink received signal strength indicator (S-RSSI) measured by the UE is sensed to exceed a predetermined threshold. There may be a PPPP associated with each logical channel, and the configuration of the PPPP value should reflect the latency requirements of both the UE and the BS. During carrier reselection, the UE may select one or more of the candidate carriers in ascending order from the lowest CBR.

[0199] SL measurement and reporting are described below.

[0200] For the purpose of QoS prediction, initial transmission parameter setting, link adaptation, link management, admission control, etc., SL measurements and reports between UEs (e.g., measurement and reporting of RSRP or RSRQ) may be considered in SL. For example, the RX-UE may receive RS from the TX-UE and measure the channel state of the TX-UE based on the RS. In addition, the RX-UE may report CSI to the TX-UE. SL measurements and reports may include measurement and reporting of CBR and reporting of location information. Examples of CSI for V2X may include channel quality indicator (CQI), precoding matrix index (PMI), rank indicator (RI), RSRP, RSRQ, path gain / path loss, SRS resource indicator (SRI), CSI-RS resource indicator (CRI), interference conditions, vehicle motion, etc. For unicast communication, based on the assumption of four or fewer antenna ports, CQI, RI and PMI or some of them may be supported in non-subband-based aperiodic CSI reports. The CSI process may not rely on an independent RS. CSI reporting may be activated and deactivated based on configuration.

[0201] For example, the TX-UE may send a channel state information-reference signal (CSI-RS) to the RX-UE, and the RX-UE may use the CSI-RS to measure CQI or RI. For example, the CSI-RS may be referred to as SL CSI-RS. For example, the CSI-RS may be restricted to PSSCH transmission. For example, the TX-UE may send the CSI-RS to the RX-UE in the PSSCH resource.

[0202] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0203] Error compensation schemes for ensuring communication reliability may include forward error correction (FEC) schemes and automatic repeat request (ARQ) schemes. In the FEC scheme, errors at the receiving end can be corrected by adding additional error correction codes to information bits. The FEC scheme has the advantages of low time delay and does not require information to be sent and received separately between the transmitting end and the receiving end, but has the disadvantage of degrading system efficiency in a good channel environment. The ARQ scheme has high transmission reliability, but has the disadvantage of causing time delays and degrading system efficiency in a poor channel environment.

[0204] A hybrid automatic repeat request (HARQ) scheme is obtained by combining FEC and ARQ, in which case performance can be improved by checking whether data received by the physical layer contains an undecodable error and requesting retransmission when an error occurs.

[0205] In the case of SL unicast and multicast, HARQ feedback and HARQ combining at the physical layer can be supported. For example, when the receiving UE operates in resource allocation mode 1 or 2, the receiving UE can receive PSSCH from the transmitting UE, and the receiving UE can send HARQ feedback relative to PSSCH using the sidelink feedback control information (SFCI) format through the physical sidelink feedback channel (PSFCH).

[0206] For example, SL HARQ feedback may be enabled for unicast. In this case, in non-code block group (non-CBG) operation, the receiving UE may decode the PSCCH with the receiving UE as the target, and when the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may generate a HARQ-ACK. The receiving UE may send a HARQ-ACK to the transmitting UE. Conversely, when the receiving UE decodes the PSCCH with the receiving UE as the target and then fails to successfully decode the transport block associated with the PSCCH, the receiving UE may generate a HARQ-NACK. The receiving UE may send a HARQ-NACK to the transmitting UE.

[0207] For example, SL HARQ feedback may be enabled for multicast. For example, in non-CBG operation, multicast may support two HARQ feedback options.

[0208] (1) Multicast Option 1: When a receiving UE decodes the PSCCH targeted at a receiving UE and then fails to decode a transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE on the PSFCH. Conversely, when a receiving UE decodes the PSCCH targeted at a receiving UE and successfully decodes a transport block associated with the PSCCH, the receiving UE may not send a HARQ-ACK to the transmitting UE.

[0209] (2) Multicast Option 2: When a receiving UE decodes the PSCCH targeted at the receiving UE and then fails to decode a transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK on the PSFCH to the transmitting UE. When a receiving UE decodes the PSCCH targeted at the receiving UE and successfully decodes a transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK on the PSFCH to the transmitting UE.

[0210] For example, when multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication can share PSFCH resources. For example, UEs belonging to the same group can use the same PSFCH resources to send HARQ feedback.

[0211] For example, when multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication may use different PSFCH resources to send HARQ feedback. For example, UEs belonging to the same group may use different PSFCH resources to send HARQ feedback.

[0212] For example, when SL HARQ feedback is enabled for multicast, the receiving UE may determine whether to send HARQ feedback to the transmitting UE based on transmit-receive (TX-RX) distance and / or RSRP.

[0213] For example, in the case of HARQ feedback based on TX-RX distance in multicast option 1, when TX-RX is less than or equal to the communication range requirement, the receiving UE may send HARQ feedback relative to PSSCH to the transmitting UE. Conversely, when the TX-RX distance is greater than the communication range requirement, the receiving UE may not send HARQ feedback relative to PSSCH to the transmitting UE. For example, the transmitting UE may notify the receiving UE of the location of the transmitting UE via the SCI associated with the PSSCH. For example, the SCI associated with the PSSCH may be a second SCI. For example, the receiving UE may estimate or obtain the TX-RX distance based on the location of the receiving UE and the location of the transmitting UE. For example, the receiving UE may decode the SCI associated with the PSSCH to understand the communication range requirement used in the PSSCH.

[0214] For example, in the case of resource allocation mode 1, the time between PSFCH and PSSCH can be configured or pre-configured. In the case of unicast and multicast, when retransmission is performed on the SL, this can be indicated to the eNB by the UE in the coverage area using PUCCH. The sending UE can also send an indication to the serving eNB of the sending UE in the form of a scheduling request (SR) / buffer status report (BSR) that is not in the form of HARQ ACK / NACK. Even if the eNB does not receive the indication, the eNB can schedule SL retransmission resources to the UE. For example, in the case of resource allocation mode 2, the time between PSFCH and PSSCH can be configured or pre-configured. In the case of unicast and multicast, when retransmission is performed on the SL, this can be indicated to the eNB using PUCCH by the UE in the coverage area. The sending UE can also send an indication to the serving eNB of the sending UE in the form of a scheduling request (SR) / buffer status report (BSR) that is not in the form of HARQ ACK / NACK. Even if the eNB does not receive the indication, the eNB can schedule SL retransmission resources to the UE.

[0215] For example, from the perspective of UE transmission in the carrier, TDM between PSCCH / PSSCH and PSFCH may be allowed for the PSFCH format of the SL in the time slot. For example, a sequence-based PSFCH format with one symbol may be supported. Here, one symbol may not be an AGC period. For example, a sequence-based PSFCH format may be applied to unicast and multicast.

[0216] For example, in a time slot associated with a resource pool, PSFCH resources may be periodically configured or pre-set in N time slot periods. For example, N may be configured as one or more values ​​equal to or greater than 1. For example, N may be 1, 2, or 4. For example, HARQ feedback with respect to transmissions in a specific resource pool may be sent only on the PSFCH on the specific resource pool.

[0217] For example, when a transmitting UE sends a PSSCH to a receiving UE on time slots #X to #N, the receiving UE may send HARQ feedback with respect to the PSSCH to the transmitting UE in time slot #(N+A). For example, time slot #(N+A) may include PSFCH resources. Here, for example, A may be a minimum integer equal to or greater than K. For example, K may be the number of logical time slots. In this case, K may be the number of time slots in a resource pool. For example, K may be the number of physical time slots. In this case, K may be the number inside and outside the resource pool.

[0218] For example, when a receiving UE sends HARQ feedback on a PSFCH resource in response to a PSSCH sent by a transmitting UE to a receiving UE, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on an implicit mechanism within an established resource pool. For example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of a timeslot index associated with the PSCCH / PSSCH / PSFCH, a subchannel associated with the PSCCH / PSSCH, and / or an identifier for identifying each receiving UE in a group from HARQ feedback based on multicast option 2. Additionally / alternatively, for example, the receiving UE may determine the frequency domain and / or code domain of the PSFCH resource based on at least one of SLRSRP, SINR, L1 source ID, and / or location information.

[0219] For example, when the HARQ feedback transmission on the PSFCH of the UE and the HARQ feedback reception on the PSFCH overlap each other, the UE may select any one of the HARQ feedback transmission on the PSFCH or the HARQ feedback reception on the PSFCH based on a priority rule. For example, the priority rule may be based on the minimum priority indication of the relevant PSCCH / PSSCH.

[0220] For example, when HARQ feedback transmissions of a UE to multiple UEs on PSFCH overlap, the UE may select a specific HARQ feedback transmission based on a priority rule. For example, the priority rule may be based on the minimum priority indication of the related PSCCH / PSSCH.

[0221] Fig.15 A plurality of BWPs according to embodiments of the present disclosure are illustrated.

[0222] Reference Fig.15 , BWP1, BWP2 and BWP3 can be configured, BWP1 has a bandwidth of 40MHz and an SCS of 15kHz, BWP2 has a bandwidth of 10MHz and an SCS of 15kHz, and BWP3 has a bandwidth of 20MHz and an SCS of 60kHz.

[0223] Fig.16 exemplifies a BWP according to an embodiment of the present disclosure. Fig.16 In the implementation manner of FIG. 5 , it is assumed that there are three BWPs.

[0224] Reference Fig.16 , a common resource block (CRB) may be a carrier RB numbered from one end of the carrier frequency band to the other end of the carrier frequency band. A PRB may be an RB numbered within each BWP. Point A may indicate a common reference point for the resource block grid.

[0225] The BWP may be configured by a point A, an offset NstartBWP from point A, and a bandwidth NsizeBWP. For example, point A may be an external reference point of the PRBs of a carrier, where subcarrier 0 is aligned for all parameter sets (e.g., all parameter sets in a carrier supported by the network). For example, the offset may be the PRB spacing between the lowest subcarrier of a given parameter set and point A. For example, the bandwidth may be the number of PRBs for a given parameter set.

[0226] A BWP may be defined for SL. The same SL BWP may be used for both transmission and reception. For example, a transmitting UE may send a SL channel or SL signal in a specific BWP, and a receiving UE may receive a SL channel or SL signal in a specific BWP. In an authorized carrier, the SL BWP may be defined separately from the Uu BWP and have separate configuration signaling from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS / network. The SL BWP may be (pre-)configured in a carrier for out-of-coverage NR V2X UEs and RRC_IDLEUEs. For a UE in RRC_CONNECTED mode, at least one SLBWP may be activated in a carrier.

[0227] A resource pool may be a set of time-frequency resources that may be used for SL transmission and / or SL reception. From the perspective of the UE, the time domain resources of the resource pool may not be continuous. Multiple resource pools may be (pre-)configured for a UE in one carrier. From the perspective of the PHY layer, the UE may perform unicast, multicast, and broadcast communications using configured or pre-configured resource pools.

[0228] Hereinafter, side link (SL) congestion control will be described.

[0229] When the UE autonomously determines the SL transmission resources, the UE can also determine the size and frequency of the resources used by the UE. Needless to say, the use of resource size or frequency exceeding a predetermined level may be restricted due to constraints from the network, etc. However, when there are many UEs concentrated in a specific area at a specific time, when all UEs use a relatively large amount of resources, the overall performance may be greatly reduced due to mutual interference.

[0230] Therefore, the UE needs to monitor the channel status. When it is determined that too many resources are being consumed, the UE can reduce its use of resources. In this specification, this can be defined as congestion control (CR). For example, the UE can determine whether the energy measured in the unit time / frequency resource is equal to or greater than a predetermined level, and can adjust the quantity and frequency of its transmission resources according to the ratio of the unit time / frequency resources in which the energy is equal to or greater than the predetermined level. In the present disclosure, the ratio of time / frequency resources in which energy at a predetermined level or greater is observed can be defined as a channel busy rate (CBR). The UE can measure the channel / frequency. In addition, the UE can send the measured CBR to the network / eNB.

[0231] Fig.17 A resource unit for measuring a CRB according to an embodiment of the present disclosure is illustrated.

[0232] Reference Fig.17 , when the UE measures the received signal strength indicator (RSSI) on a subchannel basis for a specific time period (e.g., 100 ms), the CBR may represent the number of subchannels having RSSI measurements equal to or greater than a predetermined threshold. Alternatively, the CBR may represent the ratio of subchannels having values ​​equal to or greater than a predetermined threshold during a specific time period. For example, Fig.17 In the embodiment, assuming that a shadow subchannel is a subchannel having a value greater than or equal to a predetermined threshold, the CBR may represent a ratio of the shadow subchannel during a time period of 100 ms. In addition, the UE may report the CBR to the eNB.

[0233] For example, Fig.18 As shown, when PSCCH and PSSCH are multiplexed, the UE can measure one CBR for one resource pool. Here, when PSFCH resources are configured or pre-configured, the PSFCH resources can be excluded from the measurement of CBR.

[0234] In addition, congestion control that takes into account the priority of a service (e.g., a packet) may be required. To this end, for example, the UE may measure a channel occupancy rate (CR). In detail, the UE may measure the CBR and may determine the maximum value CRlimitk of the channel occupancy rate k (CRk) of the channel occupied by the service corresponding to each priority (e.g., k) based on the CBR measurement. For example, the UE may derive the maximum value CRlimitk of the channel occupancy of the priority of each service based on a predetermined table for CBR measurement values. For example, in the case of a service with a relatively high priority, the UE may derive a maximum value for a relatively large channel occupancy rate. The UE may then perform congestion control by limiting the sum of the channel occupancies of services with a priority k lower than that of services i to a predetermined value or less. When using this method, a stronger channel occupancy limit may be applied to services with a relatively low priority.

[0235] In addition, the UE can perform SL congestion control using methods such as adjustment of transmission power level, packet discard, determination as to whether to retransmit, and adjustment of transmission RB size (MCS adjustment).

[0236] In NR SL, when a slot format with flexible SCS and FR is used, the length of one OFDM symbol can be changed according to the SCS and FR. Specifically, in the case of FR2, the length of one OFDM symbol can be reduced, and the number of OFDM symbols required for AGC operation in one slot can be increased. For example, in the case of FR2, when the time required for AGC operation is 70us, even in an SCS of 120kHz, the AGC operation needs to always use 1 slot or more, and the overhead may increase excessively.

[0237] According to the present disclosure, in order to reduce the above-mentioned overhead, the UE in the NR SL can group multiple time slots according to FR and / or SCS, and can schedule / sense the grouped time slots.

[0238] For example, in FR2, the UE may always group two time slots in one unit and may schedule / sense the time slots so as to increase the number of OFDM symbols present in a transmission unit (eg, at least one time slot or at least one subframe).

[0239] Hereinafter, in the present disclosure, transmitting at least two time slots in one unit is referred to as time slot aggregation. In addition, the aggregated time slots may be referred to as aggregated time slots or aggregated sets. The time slot aggregation operation may be used in a case where a longer transmission time is required or data with a relatively large payload size is transmitted, so as to collect a sufficient amount of energy in the case of a relatively far target coverage as a target service, and thus the time slots may be scheduled / sensed in units of time slot aggregation.

[0240] Fig.19 It is a diagram for explaining time slot aggregation.

[0241] Reference Fig.19 , time slot aggregation can be a scheduling and transmission unit formed by aggregating at least two time slots. For example, 4 time slots (N to N+3 time slots) can be aggregated.

[0242] Aggregate data transmission starting from time slot N of the TX UE may be completed in time slot N+3, but transmission of high priority data may be required during transmission of aggregate data of the corresponding TX UE. In this case, there may be a problem in the method of transmitting the corresponding high priority data.

[0243] Hereinafter, the present disclosure discloses various examples of a method of overcoming problems in transmitting high priority data in time slot aggregation and a device supporting the method.

[0244] Figure 20 to Figure 21 This is a diagram for explaining data transmission based on priority in time slot aggregation.

[0245] Reference Fig. 20 , when high priority data in time slot N+2 needs to be transmitted during aggregate data transmission (i.e., data transmission in time slots N to N+3), the time slot (e.g., N+2) in which the corresponding data (having a relatively high priority) needs to be transmitted may be any of the time slots (e.g., time slots N to N+3) reserved in advance for transmission of relatively low priority resources. Therefore, the time slot (e.g., N+2) required for the corresponding data transmission is likely to be a time slot having relatively high interference.

[0246] According to the present disclosure, when high priority data needs to be transmitted in an aggregated time slot, a sensing operation for transmission of the corresponding data (ie, high priority data) may be newly performed to improve transmission reliability. The sensing operation may refer to a sensing operation performed for (re)selection in the aforementioned SL.

[0247] When a sensing operation needs to be newly performed, the UE may additionally discard one (or more) low priority time slots (e.g., time slot N+1 or its previous time slot) to ensure the time of the sensing operation. That is, the UE may reorder the sensing operation for the aggregated time slot so as to select a time slot (i.e., resource) for sending high priority data among multiple time slots in the aggregated time slot, and when any time slot is determined by the sensing operation, the low priority data may be discarded, and the high priority data may be sent in the corresponding time slot.

[0248] According to the present disclosure, in order to reduce the overhead of resources discarded for transmission of high priority data in an aggregated time slot, the UE may use a sensing result performed for transmission of previous low priority data instead of newly performing a sensing operation.

[0249] In other words, a second time slot for sending a side link data signal with a high priority may be selected from among multiple time slots in an aggregated time slot based on sensing information for selecting a first time slot for sending a side link data signal with a low priority from among multiple time slots. For example, the sensing information may include at least one of a reference signal received power (RSRP), a channel busy rate (CBR), or a quality of service (QoS) measured in at least one time slot associated with the first time slot. Here, at least one time slot may be located before the first time slot in the time domain. A side link data signal with a low priority scheduled on the second time slot may be discarded.

[0250] For example, when the difference between the relative priorities of low priority and high priority is equal to or less than a predetermined (preconfigured or predefined) threshold and / or the absolute priority of the low priority is equal to or greater than a predetermined (preconfigured or predefined) threshold, the UE may use the resources reserved for low priority transmission as is.

[0251] In this case, a predetermined (preconfigured or predefined) threshold may be configured from the eNB.

[0252] According to the present disclosure, when high priority data is sent in any time slot of the aggregated time slots in which low priority data is sent, the TX UE can indicate to the RX UE, based on the delay budget, any time slot after the aggregated time slot to send the low priority data discarded in the corresponding time slot (i.e., the time slot in which the high priority data is sent (e.g., time slot N+2)).

[0253] For example, as in Fig. 20 When the delay budget (e.g., 3 time slots) of the corresponding data (i.e., low priority data) is sufficient, the TX UE may dynamically indicate a time slot (e.g., time slot N+5) within the delay budget for sending the corresponding data. Here, sufficient delay budget may mean that the number of time slots in the delay budget is equal to or greater than the preset number of time slots.

[0254] The aforementioned examples of the present disclosure may be implemented in various ways according to the transmission frequency of the PSCCH within the aggregated time slot. For example, when the PSCCH is transmitted per time slot, that is, when the PSCCH is transmitted at each of the multiple time slots in the aggregated time slot, the RX UE may be able to identify whether the high priority data is preempted based on the PSCCH decoding result, and thus may transmit or discard the high / low priority data according to the aforementioned examples of the present disclosure.

[0255] For example, when PSCCH is not transmitted in every time slot, when PSCCH is transmitted in at least one time slot of multiple time slots in the aggregated time slot, the UE can transmit high priority data after completing the transmission of the PSSCH time slot associated with the corresponding PSCCH. That is, when PSCCH is not transmitted at each of the multiple time slots in the aggregated time slot, the UE can transmit high priority data after transmitting the PSSCH associated with the PSCCH.

[0256] The TX UE can use the DMRS sequence information of the PSSCH of one (or more) time slots before and / or after the time slot for sending the high priority data to indicate whether the high priority data is preempted. Specifically, based on the fact that the PSCCH (i.e., the side link control signal) is not sent in each of the multiple time slots within the aggregated time slot, it can be indicated based on the DMRS information of the PSSCH sent in the remaining time slots except the second time slot among the multiple time slots whether the side link data signal with high priority is scheduled.

[0257] For example, the TX UE may use the initialization sequence c corresponding to the PSSCH DMRS sequence. init The associated information indicates whether the high priority data is preempted. init The associated information may be, for example, a CRC value of a PSCCH associated with a PSSCH.

[0258] For example, the TX UE may indicate whether high priority data is preempted based on the position of the PSCCH DMRS symbol.

[0259] When the TX UE indicates whether the high priority data is preempted, the RX UE can recognize whether the high priority data is preempted without decoding the information of the PSCCH.

[0260] In the above examples of the present disclosure, there may be exceptions in terms of system interference. Specifically, the UE may determine the transmission time of the high priority data based on the number of time slots in the aggregation set and determine the transmission time of the high priority data in consideration of the system interference.

[0261] Reference Fig.21 , when the number of time slots included in the aggregation set is A and the arrival point of the high priority data is B, if B<A, the aggregation set data is sent from time slot N to time slot N+A, and the high priority data is sent in the (N+B)th time slot. The UE can send the high priority data after completely sending the aggregation set data based on the number of time slots A included in the aggregation set and the arrival point B of the high priority.

[0262] For example, when AB or (AB) / A is equal to or less than a predetermined threshold, the UE may transmit the high priority data after completely transmitting the aggregate set data (i.e., after the time slot N+A), instead of transmitting the high priority data in the time slot N+B. In other words, even if the high priority data needs to be transmitted in the N+B time slot, when AB or (AB) / A is equal to or less than a predetermined threshold, the UE may postpone the transmission of the high priority data in the N+B time slot until after the transmission of the aggregate set data is completed.

[0263] In the above examples of the present disclosure, the high priority data that needs to be sent to the TX UE may be data requested from the eNB (e.g., NR transmission mode 1 data or LTE transmission mode 3 data).

[0264] Fig. 22 is a flowchart of a method of transmitting a side link signal according to an example of the present disclosure.

[0265] Reference Fig. 22 In S1201, the UE may send a side link control signal on an aggregated timeslot. Here, the aggregated timeslot may include multiple timeslots.

[0266] In S1203, the UE may send a first side link data signal and a second side link data signal on the aggregated timeslot based on the side link control signal. In this case, the priority set for the second side link data signal may be higher than the priority set for the first side link data signal.

[0267] In this case, a second time slot in which the second side link data signal is transmitted among the plurality of time slots may be selected based on the sensing information used to select the first time slot in which the first side link data signal is transmitted among the plurality of time slots.

[0268] For example, the sensing information may include at least one of a reference signal received power (RSRP), a channel busy rate (CBR), or a quality of service (QoS) measured in at least one time slot related to the first time slot.

[0269] For example, at least one time slot may precede the first time slot in the time domain.

[0270] When there is a first sidelink data signal scheduled on the second time slot, the UE may discard the first sidelink data signal.

[0271] For example, the sidelink control signal may be sent in each of a plurality of time slots.

[0272] Alternatively, the side link control signal may not be transmitted in each of the plurality of time slots. In this case, based on the fact that the side link control signal is not transmitted in each of the plurality of time slots, it may be indicated whether the second side link data signal is scheduled based on demodulation reference signal (DMRS) information of a physical side link shared channel (PSSCH) transmitted in the remaining time slots except the second time slot among the plurality of time slots.

[0273] According to various examples of the present disclosure described above, a UE / eNB may overcome problems in transmission operations of high priority data that occur when slot aggregation is applied.

[0274] Obviously, each example of the proposed method may also be included as one of the various embodiments of the present disclosure, so each example may be regarded as a proposed method. Although the proposed method may be implemented independently, some of the proposed methods may be combined (or merged) and implemented. For the convenience of description, the method proposed in the present disclosure has been described in the context of the 3GPP NR system, and the scope of the system to which the proposed method is applied may be extended to other systems besides the 3GPP NR system. For example, the proposed method of the present disclosure may be extended and applied to D2D communication. Here, D2D communication refers to direct communication between UEs through a radio channel. Although UE refers to a user terminal, if a network device such as a BS sends and receives signals according to a UE-to-UE communication scheme, the network device may also be regarded as a UE. In addition, the proposed method of the present disclosure may be limitedly applied to mode 3 V2X operation (and / or mode 4 V2X operation). For example, the proposed method of the present disclosure may be limitedly applied to the transmission of a pre-configured (and / or signaled) (specific) V2X channel (and / or signal) (e.g., PSSCH (and / or (related) PSCCH and / or PSBCH)). For example, when the PSSCH and (related to it) PSCCH are transmitted so that they are positioned adjacent (and / or non-adjacent) (in the frequency domain) (and / or when transmission is performed based on a pre-configured (and / or signaled) MCS (code rate and / or RB) value (and / or range), the proposed method of the present disclosure may be limitedly applied. For example, the proposed method of the present disclosure may be limitedly applied to a Mode 3 (and / or Mode 4) V2X carrier (Mode 4 (and / or 3) SL (and / or UL) SPS carrier and / or Mode 4 (and / or 3) dynamic scheduling carrier). In addition, when the position and / or number of synchronization signal (transmission (and / or reception)) resources (and / or the position and / or number of subframes in the V2X resource pool (and / or the size and number of subchannels)) are the same (and / or (partially) different) between carriers, the proposed method of the present disclosure can be limitedly applied. For example, the proposed method of the present disclosure can be extended and applied to (V2X) communication between a BS and a UE. For example, the proposed method of the present disclosure can be limitedly applied to unicast (SL) communication (and / or multicast (or groupcast) (SL) communication and / or broadcast (SL) communication).

[0275] Example of a communication system to which the present disclosure is applied

[0276] The various descriptions, functions, processes, proposals, methods and / or operational flowcharts of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0277] In the following, a more detailed description will be given with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may refer to the same or corresponding hardware blocks, software blocks or functional blocks.

[0278] Fig.23 A communication system 1 applied to the present disclosure is illustrated.

[0279] Reference Fig.23 , the communication system 1 applied to the present disclosure includes a wireless device, a base station (BS) and a network. In this article, the wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)) and can be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. In this article, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. Handheld devices may include smart phones, smart tablets, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0280] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0281] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. In this article, wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping) and at least a part of the resource allocation process can be performed based on various proposals of the present disclosure.

[0282] Examples of wireless devices to which the present disclosure is applied

[0283] Fig.24 A wireless device suitable for use with the present disclosure is illustrated.

[0284] Reference Fig.24 , the first wireless device 100 and the second wireless device 200 may transmit radio signals through various RATs (e.g., LTE and NR). In this document, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.23 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in.

[0285] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flow charts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including commands for executing part or all of the processes controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document. In this document, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each of the transceivers 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0286] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then send a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 106, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing part or all of the processes controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. In this document, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0287] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flows disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. According to the description, functions, procedures, proposals, methods, and / or operational flows disclosed in this document, one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206, and obtain the PDU, SDU, message, control information, data, or information.

[0288] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. 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 one or more processors 102 and 202. Firmware or software may be used to implement the description, function, process, proposal, method, and / or operation flow disclosed in this document, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to perform the description, function, process, proposal, method, and / or operation flow disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 so as to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document may be implemented using firmware or software in the form of codes, commands and / or command sets.

[0289] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0290] One or more transceivers 106 and 206 can send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow of this document to one or more other devices. One or more transceivers 106 and 206 can receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 can be connected to one or more processors 102 and 202, and send and receive radio signals. For example, one or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods, and / or operation flows disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals into baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals into RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0291] Here, the wireless communication technology implemented in the wireless devices 100 and 200 in the present disclosure may include narrowband Internet of Things for low power communication as well as LTE, NR and 6G. In this case, for example, NB-IoT technology may be an example of low power wide area network (LPWAN) technology, and may be implemented in standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. In addition or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 may be performed based on LTE-M technology. In this case, for example, LTE-M technology may be an example of LPWAN technology and may be referred to as various terms such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented as at least one of various standards such as 1) LTE CAT (LTE Category) 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 may not be limited to the above terms. Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the wireless devices 100 and 200 according to the present disclosure may include at least one of ZigBee, Bluetooth, or a low power wide area network (LPWAN) and is not limited to the above terms. For example, ZigBee technology may generate a personal area network (PAN) associated with small / low power digital communication based on various standards such as IEEE 802.15.4, and may be referred to as various terms.

[0292] Examples of vehicles or autonomous driving vehicles to which the present disclosure is applied

[0293] Fig.25 The vehicle or autonomous driving vehicle applied to the present disclosure is illustrated. The vehicle or autonomous driving vehicle can be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0294] Reference Fig.25 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig.23 Block 110 / 130 / 140.

[0295] The communication unit 110 can send and receive signals (e.g., data and control signals) with external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or autonomous driving vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a can enable the vehicle or autonomous driving vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b can supply power to the vehicle or autonomous driving vehicle 100 and include a wired / wireless charging circuit, a battery, 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, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane on which the vehicle is traveling, a technology for automatically adjusting a speed such as an adaptive cruise control, a technology for autonomous driving along a determined path, a technology for traveling by automatically setting a path when a destination is set, and the like.

[0296] For example, the communication unit 110 may receive map data, business information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically obtain the most recent traffic information data from an external server, and may obtain surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data based on information collected from the vehicle or autonomous driving vehicle, using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0297] Examples of vehicles and AR / VR using the present disclosure

[0298] Fig.26The vehicle applied to the present disclosure is exemplified. The vehicle may be implemented as a transportation device, an aircraft, a ship, and the like.

[0299] Reference Fig.26 , the vehicle 100 may include a communication unit 110, a control unit 120, a memory unit 130, an I / O unit 140a, and a positioning unit 140b.

[0300] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the vehicle 100. The memory unit 130 may store data / parameters / programs / codes / commands for supporting various functions of the vehicle 100. The I / O unit 140a may output AR / VR objects based on the information in the memory unit 130. The I / O unit 140a may include a HUD. The positioning unit 140b may acquire information about the location of the vehicle 100. The location information may include information about the absolute position of the vehicle 100, information about the position of the vehicle 100 within the driving lane, acceleration information, and information about the position of the vehicle 100 from adjacent vehicles. The positioning unit 140b may include a GPS and various sensors.

[0301] As an example, the communication unit 110 of the vehicle 100 may receive map information and traffic information from an external server and store the received information in the memory unit 130. The positioning unit 140b may obtain vehicle position information through GPS and various sensors and store the obtained information in the memory unit 130. The control unit 120 may generate a virtual object based on the map information, traffic information, and vehicle position information, and the I / O unit 140a may display the generated virtual object in a window (1410 and 1420) in the vehicle. The control unit 120 may determine whether the vehicle 100 is driving normally in the driving lane based on the vehicle position information. If the vehicle 100 exits abnormally from the driving lane, the control unit 120 may display a warning on the window of the vehicle through the I / O unit 140a. In addition, the control unit 120 may broadcast a warning message about driving abnormality to adjacent vehicles through the communication unit 110. Depending on the situation, the control unit 120 may send vehicle position information and information about driving / vehicle abnormality to relevant agencies.

[0302] Examples of XR Devices Using the Present Disclosure

[0303] Fig. 27 The XR device applied to the present disclosure is illustrated. The XR device can be implemented by an HMD, a HUD installed in a vehicle, a TV, a smart phone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, etc.

[0304] Reference Fig. 27 , the XR device 100a may include a communication unit 110, a control unit 120, a memory unit 130, an I / O unit 140a, a sensor unit 140b, and a power supply unit 140c.

[0305] The communication unit 110 may send / receive signals (e.g., media data and control signals) to / from external devices such as other wireless devices, handheld devices, or media servers. The media data may include video, images, and sound. The control unit 120 may perform various operations by controlling the constituent elements of the XR device 100a. For example, the control unit 120 may be configured to control and / or perform processes such as video / image acquisition, (video / image) encoding, and metadata generation and processing. The memory unit 130 may store data / parameters / programs / codes / commands required to drive the XR device 100a / generate an XR object. The I / O unit 140a may obtain control information and data from the outside and output the generated XR object. The I / O unit 140a may include a camera, a microphone, a user input unit, a display unit, a speaker, and / or a tactile module. The sensor unit 140b may obtain the XR device status, surrounding environment information, user information, and the like. The sensor unit 140b may include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar. The power supply unit 140c may supply power to the XR device 100a and include a wired / wireless charging circuit, a battery, and the like.

[0306] For example, the memory unit 130 of the XR device 100a may include information (e.g., data) required to generate an XR object (e.g., an AR / VR / MR object). The I / O unit 140a may receive a command for manipulating the XR device 100a from a user, and the control unit 120 may drive the XR device 100a according to the user's drive command. For example, when a user desires to watch a movie or news through the XR device 100a, the control unit 120 sends content request information to another device (e.g., a handheld device 100b) or a media server through the communication unit 110. The communication unit 110 may download / stream content such as a movie or news from another device (e.g., a handheld device 100b) or a media server to the memory unit 130. The control unit 120 may control and / or perform processes such as video / image acquisition, (video / image) encoding, and metadata generation / processing regarding content, and generate / output an XR object based on information about the surrounding space or real objects obtained through the I / O unit 140a / sensor unit 140b.

[0307] The XR device 100a may be wirelessly connected to the handheld device 100b through the communication unit 110, and the operation of the XR device 100a may be controlled by the handheld device 100b. For example, the handheld device 100b may operate as a controller of the XR device 100a. To this end, the XR device 100a may obtain information about the 3D position of the handheld device 100b, and generate and output an XR object corresponding to the handheld device 100b.

[0308] Examples of robots to which the present disclosure is applied

[0309] Fig.28 The robot applied to the present disclosure is exemplified. According to the purpose or field of use, the robot can be classified into an industrial robot, a medical robot, a household robot, a military robot, etc.

[0310] Reference Fig.28 , the robot 100 may include a communication unit 110, a control unit 120, a memory unit 130, an I / O unit 140a, a sensor unit 140b, and a driving unit 140c.

[0311] The communication unit 110 may send / receive signals (e.g., drive information and control signals) to / from external devices such as other wireless devices, other robots, or control servers. The control unit 120 may perform various operations by controlling the constituent elements of the robot 100. The memory unit 130 may store data / parameters / programs / codes / commands for supporting various functions of the robot 100. The I / O unit 140a may obtain information from the outside of the robot 100 and output information to the outside of the robot 100. The I / O unit 140a may include a camera, a microphone, a user input unit, a display unit, a speaker, and / or a tactile module. The sensor unit 140b may obtain internal information, surrounding environment information, user information, etc. of the robot 100. The sensor unit 140b may include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyroscope sensor, an inertial sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, a radar, etc. The drive unit 140c may perform various physical operations, such as movement of robot joints. In addition, the driving unit 140c may enable the robot 100 to travel or fly on a road. The driving unit 140c may include an actuator, a motor, a wheel, a brake, a propeller, and the like.

[0312] Examples of AI devices to which the present disclosure is applied

[0313] Fig.29The AI ​​device applied to the present disclosure is illustrated. The AI ​​device can be implemented by a fixed device or a mobile device such as a TV, a projector, a smart phone, a PC, a notebook, a digital broadcast terminal, a tablet PC, a wearable device, a set-top box (STB), a radio device, a washing machine, a refrigerator, a digital signage, a robot, a vehicle, etc.

[0314] Reference Fig.29 , the AI ​​device 100 may include a communication unit 110, a control unit 120, a memory unit 130, an I / O unit 140a / 140b, a learning processor unit 140c, and a sensor unit 140d.

[0315] The communication unit 110 can use wired / wireless communication technology to send wired / radio signals (e.g., sensor information, user input, learning model, or control signal) to other AI devices (e.g., Fig.23 100x, 200, or 400) or AI servers (e.g. Fig.23 400) and from external devices such as other AI devices (e.g., Fig.23 100x, 200, or 400) or AI servers (e.g. Fig.23 400) or the like. To this end, the communication unit 110 may transmit information in the memory unit 130 to the external device, and transmit a signal received from the external device to the memory unit 130.

[0316] The control unit 120 may determine at least one feasible operation of the AI ​​device 100 based on information determined or generated using a data algorithm or a machine learning algorithm. The control unit 120 may perform an operation determined by controlling the constituent elements of the AI ​​device 100. For example, the control unit 120 may request, search, receive, or use data of the learning processor unit 140c or the memory unit 130, and control the constituent elements of the AI ​​device 100 to perform an operation determined to be preferred or predicted among at least one feasible operation. The control unit 120 may collect historical information including the operation content of the AI ​​device 100 and the operation feedback of the user, and store the collected information in the memory unit 130 or the learning processor unit 140c, or send the collected information to a server such as an AI server ( Fig.23 The collected historical information can be used to update the learning model.

[0317] The memory unit 130 may store data for supporting various functions of the AI ​​device 100. For example, the memory unit 130 may store data obtained from the input unit 140a, data obtained from the communication unit 110, output data of the learning processor unit 140c, and data obtained from the sensor unit 140d. The memory unit 130 may store control information and / or software codes required to operate / drive the control unit 120.

[0318] The input unit 140a may acquire various types of data from outside the AI ​​device 100. For example, the input unit 140a may acquire learning data for model learning, and input data to be applied to the learning model. The input unit 140a may include a camera, a microphone, and / or a user input unit. The output unit 140b may generate output related to visual, auditory, or tactile perception. The output unit 140b may include a display unit, a speaker, and / or a tactile module. The sensor unit 140d may use various sensors to obtain at least one of the internal information of the AI ​​device 100, the surrounding environment information of the AI ​​device 100, and the user information. The sensor unit 140d may include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, a light sensor, a microphone, and / or a radar.

[0319] The learning processor unit 140c can use the learning data to learn a model composed of an artificial neural network. The learning processor unit 140c can communicate with the AI ​​server ( Fig.23 The learning processor unit 140c may perform AI processing together with the learning processor unit 400 of FIG. 400. The learning processor unit 140c may process information received from an external device through the communication unit 110 and / or information stored in the memory unit 130. In addition, the output value of the learning processor unit 140c may be sent to an external device through the communication unit 110 and may be stored in the memory unit 130.

[0320] Industrial Applicability

[0321] The above-mentioned embodiments of the present disclosure are applicable to various mobile communication systems.

Claims

1. A method for a user equipment UE in a wireless communication system, the method comprising the following steps: transmitting a sidelink control signal in an aggregated time slot comprising a plurality of time slots; as well as transmitting a first sidelink data signal and a second sidelink data signal on the aggregated time slot based on the sidelink control signal, wherein the second side link data signal is configured with a higher priority than the first side link data signal, wherein the first side link data signal is sent in a first time slot, and the second side link data signal is sent in a second time slot, wherein the second time slot is selected based on sensing information used to select the first time slot, and Wherein, for the time slot in the aggregated time slot in which the side link control signal is not sent: Whether to schedule the second sidelink data signal having the higher priority is indicated based on physical sidelink shared channel PSSCH-demodulation reference signal DMRS information transmitted in the remaining time slots except the second time slot.

2. The method according to claim 1, wherein: The sensing information includes at least one of a reference signal received power RSRP, a channel busy rate CBR, or a quality of service QoS measured in at least one time slot related to the first time slot.

3. The method according to claim 2, wherein: The at least one time slot is located before the first time slot in the time domain.

4. The method according to claim 1, wherein: The first sidelink data signal scheduled on the second time slot is discarded.

5. A device for a user equipment UE in a wireless communication system, the device comprising: at least one processor; as well as at least one memory operatively connected to the at least one processor and configured to store at least one instruction for allowing the at least one processor to perform operations comprising: transmitting a sidelink control signal within an aggregated time slot comprising a plurality of time slots; and transmitting a first sidelink data signal and a second sidelink data signal on the aggregated time slot based on the sidelink control signal, wherein the second side link data signal is configured with a higher priority than the first side link data signal, wherein the first side link data signal is sent in a first time slot, and the second side link data signal is sent in a second time slot, wherein the second time slot is selected based on sensing information used to select the first time slot, and Wherein, for the time slot in the aggregated time slot in which the side link control signal is not sent: Whether to schedule the second sidelink data signal having the higher priority is indicated based on physical sidelink shared channel PSSCH-demodulation reference signal DMRS information transmitted in the remaining time slots except the second time slot.

6. The device according to claim 5, wherein: The sensing information includes at least one of a reference signal received power RSRP, a channel busy rate CBR, or a quality of service QoS measured in at least one time slot related to the first time slot.

7. The device according to claim 6, wherein: The at least one time slot is located before the first time slot in the time domain.

8. The device according to claim 5, wherein: The first sidelink data signal scheduled on the second time slot is discarded.

9. A computer-readable recording medium for storing at least one computer program comprising at least one instruction, wherein when executed by at least one processor, the at least one instruction allows the at least one processor to perform operations of a user equipment (UE), the operations comprising: transmitting a sidelink control signal in an aggregated time slot comprising a plurality of time slots; as well as transmitting a first sidelink data signal and a second sidelink data signal on the aggregated time slot based on the sidelink control signal, wherein the second side link data signal is configured with a higher priority than the first side link data signal, wherein the first side link data signal is sent in a first time slot, and the second side link data signal is sent in a second time slot, wherein the second time slot is selected based on sensing information used to select the first time slot, and Wherein, for the time slot in the aggregated time slot in which the side link control signal is not sent: Whether to schedule the second sidelink data signal having the higher priority is indicated based on physical sidelink shared channel PSSCH-demodulation reference signal DMRS information transmitted in the remaining time slots except the second time slot.

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