METHOD FOR OPERATION OF RELAY UE IN SIDE LINK IN WIRELESS COMMUNICATION SYSTEM - Patent application

Abstract

One embodiment of the present invention is a method of sidelink-related operation of a relay UE in a communication system, the method including: the relay UE receiving a first message from a remote UE including a first cause value; the relay UE setting a second cause value based on the first cause value; and the relay UE attempting an RRC connection to a base station by sending a second message including the second cause value, the first message being related to triggering the RRC connection attempt; and whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on a type of the first cause value.

Description

Technical Field

[0001] The present invention relates to a wireless communication system, and more specifically, to a method and apparatus for a relay UE's RRC connection request in response to a request received from a remote UE in a sidelink.

Background Art

[0002] Wireless connection systems are widely deployed to provide various communication services such as voice and data. In general, a wireless connection system is a multiple access system that can support communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include CDMA (code division multiple access) systems, FDMA (frequency division multiple access) systems, TDMA (time division multiple access) systems, OFDMA (orthogonal frequency division multiple access) systems, SC-FDMA (single carrier frequency division multiple access) systems, MC-FDMA (multi carrier frequency division multiple access) systems, and the like.

[0003] In wireless communication systems, various RATs (Radio Access Technologies) such as LTE, LTE-A, and WiFi (registered trademark) are used, and 5G is also included here. The three main requirement areas of 5G include (1) the enhanced mobile broadband (eMBB) area, (2) the massive machine type communication (mMTC) area, and (3) the ultra-reliable and low latency communications (URLLC) area. In some use cases, multiple areas are required for optimization, while in other use cases, it is also possible to focus only on one key performance indicator (KPI). 5G is to support such various use cases in a flexible and reliable manner.

[0004] eMBB goes beyond basic mobile Internet access to cover rich two-way operations, media and entertainment applications in cloud or extended reality. Data is one of the core drivers of 5G, and for the first time in the 5G era, dedicated voice services may not be seen. In 5G, voice is expected to be processed as an application simply using the data connection provided by the communication system. The main reasons for the increased traffic volume are the increase in content size and the increase in the number of applications that require high data transmission rates. Streaming services (audio and video), conversational video, and mobile Internet connections are more widely used as more devices are connected to the Internet. Such numerous applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are growing rapidly on mobile communication platforms, which are applicable to all aspects of business and entertainment. Cloud storage is also a special use case that drives the growth of uplink data transmission rates. 5G is also used for cloud-based remote operations and requires very low end-to-end latency to maintain an excellent user experience when a tactile interface is used. Entertainment, such as cloud gaming and video streaming, is another core element that increases the requirements for mobile broadband capabilities. Entertainment is essential on smartphones and tablets everywhere, including high-mobility environments such as cars, vehicles, and airplanes. Further use cases include extended reality for entertainment and information search. Here, extended reality requires very low latency and instantaneous data volume.

[0005] Another much anticipated use case of 5G is the function of enabling seamless connection of embedded sensors in all fields, namely mMTC. It is predicted that the number of potential IoT devices will reach 20.4 billion by 2020. Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture, and security infrastructure.

[0006] URLLC includes new services that transform industries through remote control of critical infrastructure and ultra-reliable / low-latency links such as self-driving vehicles. The levels of reliability and latency are essential for smart grid control, industrial automation, robotics, drone control, and regulation.

[0007] Next, more specific descriptions will be given for a number of use cases.

[0008] 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) by means of providing streams that are evaluated from hundreds of megabytes per second to gigabytes per second. Such high speeds are required not only for virtual reality and augmented reality but also for transmitting TV at resolutions above 4K (6K, 8K, and beyond). VR (Virtual Reality) and AR (Augmented Reality) applications include nearly immersive sports competitions. Special network settings can be required for specific applications. For example, in the case of VR games, integration between the core server and the edge network server of the network operator is necessary for the game company to minimize latency.

[0009] Automobiles, with their many use cases for mobile communication with vehicles, are expected to be an important new driver in 5G. For example, entertainment for passengers requires high simultaneous capacity and high-mobility mobile broadband. This is because future users will expect high-quality connectivity regardless of their location and speed. Another use case in the automotive field is the augmented reality dashboard. This superimposes and displays information on the front windshield that the driver is looking at, identifying objects in the dark and informing the driver of the distance and movement of the objects. Future wireless modules will enable information exchange between vehicles, between vehicles and the supporting infrastructure, and between automobiles and other connected devices (e.g., devices accompanied by pedestrians). Safety systems can guide alternative courses of action, such as reducing the risk of accidents, for safer driving by the driver. The next step is remote control or self-driven vehicles. This requires very high reliability and very fast communication between different self-driven vehicles and between the vehicle and the infrastructure. In the future, self-driven vehicles will perform all driving activities, and drivers will only focus on traffic anomalies that the vehicle itself cannot identify. The technical requirements for self-driven vehicles call for ultra-low latency and ultra-high-speed reliability so that traffic safety increases to a level that humans cannot achieve.

[0010] Smart cities and smart homes, referred to as the smart society, are embedded in high-density wireless sensor networks. The distributed network of intelligent sensors identifies conditions related to the cost and energy-efficient maintenance of the city or home. Similar settings are made for each household. Temperature sensors, window and heating controls, burglary alarms, and household appliances are all wirelessly connected. Most of these sensors typically have low data transmission speeds, low power consumption, and low cost. However, for example, real-time HD video is required by certain types of devices for surveillance.

[0011] The consumption and distribution of energy containing heat or gas are highly decentralized, and automated control of distributed sensor networks is required. A smart grid collects information and interconnects such sensors using digital information and communication technologies to operate thereby. Since this information includes the behavior of suppliers and consumers, the smart grid can improve the efficiency, reliability, economy, sustainability of production, and the distribution of fuels such as electricity in an automated manner. The smart grid also appears to be other sensor networks with low latency.

[0012] The health segment has many applications that benefit from mobile communications. The communication system supports telemedicine that provides clinical diagnosis at a distance. This can overcome the barrier of distance and improve access to medical services that are not continuously available in remote rural areas. It is also used to save lives in critical medical and emergency situations. The wireless sensor network of the mobile communication infrastructure can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

[0013] Wireless and mobile communications are becoming important in industrial application areas. Wiring is expensive to install and maintain. Therefore, the possibility of alternation to wireless links that reconfigure cables is an attractive opportunity in many industrial fields. However, achieving this requires that the wireless connection operates with the same latency, reliability, and capacity as cables, and that its management is simplified. Low latency and a very low error rate are new requirements that need to be connected to 5G.

[0014] Logistics and freight tracking are important use cases for mobile communications that enable inventory and package tracking anywhere using location-based information systems. Use cases for logistics and freight tracking typically require low data speeds but wide coverage and reliable location information.

[0015] A wireless communication system is a multiple access system that shares available system resources (such as bandwidth, transmission power, etc.) to support communication with multiple users. Examples of multiple access systems include CDMA (code division multiple access) systems, FDMA (frequency division multiple access) systems, TDMA (time division multiple access) systems, OFDMA (orthogonal frequency division multiple access) systems, SC-FDMA (Single carrier frequency division multiple access) systems, MC-FDMA (multi carrier frequency division multiple access) systems, etc.

[0016] Sidelink (SL) refers to a communication method in which a direct link is established between terminals (User Equipment, UE) to directly exchange voice or data, etc. between terminals without going through a base station (Base Station, BS). SL is one solution to solve the burden on the base station caused by the rapidly increasing data traffic.

[0017] V2X (vehicle-to-everything) means a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-built things, etc. through wired or wireless communication. V2X is classified into four types such as V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication is provided by the PC5 interface and / or the Uu interface.

[0018] As more communication devices demand greater communication capacity, the need for enhanced mobile broadband communication, which is an improvement over existing radio access technologies, is on the rise. Accordingly, the design of communication systems that take into account services or terminals sensitive to reliability and latency is being discussed. Next-generation radio access technologies that consider enhanced mobile broadband communication, massive MTC, URLLC (Ultra-Reliable and Low Latency Communication), etc. are called new RAT (new radio access technology) or NR (new radio). V2X (vehicle-to-everything) communication can also be supported in NR.

[0019] FIG. 1 is a diagram for explaining a comparison between V2X communication based on a RAT prior to NR and V2X communication based on NR.

[0020] In relation to V2X communication, in a RAT prior to NR, a scheme for providing safety services based on V2X messages such as BSM (Basic Safety Message), CAM (Cooperative Awareness Message), and DENM (Decentralized Environmental Notification Message) has been discussed. V2X messages include location information, dynamic information, attribute information, etc. For example, a terminal can transmit a CAM of the periodic message type and / or a DENM of the event triggered message type to other terminals.

[0021] For example, CAM includes basic vehicle information such as dynamic state information of the vehicle like direction and speed, static vehicle data like dimensions, external lighting state, route details, etc. For example, the terminal can broadcast CAM, and the delay of CAM must not be greater than 100 ms. For example, when sudden situations such as vehicle failures or accidents occur, the terminal can generate DENM and send it to other terminals. For example, all vehicles within the transmission range of the terminal can receive CAM and / or DENM. In this case, DENM has a higher priority than CAM.

[0022] Subsequently, in relation to V2X communication, various V2X scenarios are defined in NR. For example, various V2X scenarios include vehicle platooning, enhanced driving, extended sensors, remote driving, etc.

[0023] For example, based on vehicle platooning, vehicles dynamically form a group and move together. For example, in order to perform platoon operations based on vehicle platooning, the vehicles belonging to the above group receive periodic data from the leading vehicle. For example, the vehicles belonging to the above group can use the periodic data to reduce or increase the inter-vehicle distance.

[0024] For example, based on enhanced driving, the vehicle is semi-automated or fully automated. Each vehicle can adjust its trajectories or maneuvers based on data obtained from local sensors of neighboring vehicles and / or neighboring logical entities. For example, each vehicle can share its driving intention with neighboring vehicles.

[0025] For example, based on extended sensors, raw data, processed data, or live video data obtained by local sensors can be exchanged between vehicles, logic elements, pedestrian terminals, and / or V2X application servers. Therefore, for example, a vehicle can recognize an environment that is better than the environment that can be sensed using its own sensors.

[0026] For example, based on remote driving, for a person who cannot drive or a remote vehicle located in a dangerous environment, a remote driver or a V2X application can operate or control the remote vehicle. For example, when the route can be predicted, such as in public transportation, cloud computing-based driving is used for the operation or control of the remote vehicle. For example, a connection to a cloud-based back-end service platform is considered for remote driving.

[0027] On the other hand, solutions for specifying service requirements for various V2X scenarios such as platooning vehicles, enhanced driving, extended sensors, and remote driving are being discussed in V2X communication based on NR.

Summary of the Invention

Problems to be Solved by the Invention

[0028] Embodiments have technical problems such as a method related to an RRC connection request of a relay UE that has received a cause value from a remote UE.

Means for Solving the Problems

[0029] One embodiment is a method for an operation related to a sidelink of a relay UE in a communication system, the method including: the relay UE receiving a first message including a first cause value from a remote UE; the relay UE setting a second cause value based on the first cause value; and the relay UE attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value, wherein the first message is related to a trigger for the attempt to establish the RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value.

[0030] One embodiment is a relay UE in a wireless communication system, including at least one processor and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, the operations including: receiving a first message including a first cause value from a remote UE; setting a second cause value based on the first cause value; and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value, wherein the first message is related to a trigger for the attempt to establish the RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value.

[0031] One embodiment is a processor for causing operations for a relay UE in a wireless communication system, the operations including: receiving a first message including a first cause value from a remote UE; setting a second cause value based on the first cause value; and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value, wherein the first message is related to a trigger for the attempt to establish the RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value.

[0032] One embodiment is a non-volatile computer-readable storage medium storing at least one computer program that, when executed by at least one processor, causes the at least one processor to perform operations for a relay UE, the operations including receiving, from a remote UE, a first message including a first cause value, setting a second cause value based on the first cause value, and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value, wherein the first message is related to a trigger for the attempt to establish the RRC connection, and whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value.

[0033] One embodiment is a method of operations related to side-link relay of a base station in a wireless communication system, the method including the base station receiving, from a relay UE, a second message including a second cause value and related to an attempt to establish an RRC connection, and the base station determining whether to establish the RRC connection of the relay UE based on the second cause value, wherein the second cause value is set based on a first cause value included in a first message received by the relay UE from a remote UE, the first message is related to a trigger for the attempt to establish the RRC connection, and whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value.

[0034] In a wireless communication system, a base station includes at least one processor and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations include the base station receiving a second message from a relay UE that includes a second cause value and is related to an attempt to establish an RRC connection, and the base station determining whether to establish an RRC connection for the relay UE based on the second cause value. The second cause value is set based on a first cause value included in a first message received by the relay UE from a remote UE, the first message being related to a trigger for the attempt to establish the RRC connection. Whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value. The base station is as described above.

[0035] Based on the first cause value being a cause value related to emergency, the relay UE sets the second cause value in the same manner as the first cause value.

[0036] Based on the first cause value being a cause value other than the cause value related to emergency, the relay UE sets the second cause value regardless of the first cause value.

[0037] The cause values other than the cause value related to emergency are included in one or more groups.

[0038] A predetermined cause value is assigned to the one or more groups.

[0039] The predetermined cause value is used as the second cause value.

[0040] The relay UE is in the RRC IDLE / INACTIVE state.

[0041] The first message triggers a transition of the relay UE to the RRC connected state.

[0042] The first message is either an RRC establishment or an RRC resume message.

[0043] The first cause value is included in the ResumeCause information element related to the RRC Resume request.

Advantages of the Invention

[0044] According to one embodiment, a relay UE in the RRC IDLE / INACTIVE state can switch to the RRC connected state for a remote UE in an emergency or a situation with a similar level of importance, and effectively assist the remote UE.

Brief Description of the Drawings

[0045] The accompanying drawings are for helping to understand the embodiments, showing various embodiments, and explaining the principles together with the description in the specification.

[0046]

Figure 1

[0047]

Figure 2

[0048]

Figure 3

[0049]

Figure 4

[0050]

Figure 5

[0051]

Figure 6

[0052]

Figure 7

[0053]

Figure 8

[0054]

Figure 9

[0055]

Figure 10

[0056]

Figure 11

[0057]

Figures 12 - 18

DETAILED DESCRIPTION OF THE INVENTION

[0058] In various embodiments of the present invention, " / " and "," indicate "and / or". For example, "A / B" means "A and / or B". Also, "A, B" also means "A and / or B". "A / B / C" means "any one of A, B and / or C". Also, "A, B, C" also means "any one of A, B and / or C".

[0059] In various embodiments of the present invention, "or" indicates "and / or". For example, "A or B" includes "only A", "only B", and / or "both A and B". In other words, "or" can be interpreted as "further or alternatively".

[0060] The following technologies can be used in various wireless connection systems such as CDMA (Code Division Multiple Access), FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single Carrier Frequency Division Multiple Access), etc. CDMA can be implemented by wireless technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA can be implemented by wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by wireless technologies such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX (registered trademark)), IEEE802-20, E-UTRA (Evolved UTRA), etc. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, adopts OFDMA in the downlink, and adopts SC-FDMA in the uplink. LTE-A (Advanced) is an evolution of 3GPP LTE.

[0061] 5G NR is a technology following LTE-A and is a new clean-slate mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, such as the low-frequency band below 1 GHz, the intermediate-frequency band from 1 GHz to 10 GHz, and the high-frequency (millimeter-wave) band above 24 GHz.

[0062] For clearer explanation, the description will be centered around LTE-A or 5G NR, but the technical idea according to an embodiment of the present invention is not limited thereto.

[0063] FIG. 2 shows the structure of an LTE system according to an embodiment of the present invention. This is also called E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network), or an LTE (Long Term Evolution) / LTE-A system.

[0064] Referring to FIG. 2, E-UTRAN includes a base station 20 that provides a control plane and a user plane to a terminal 10. The terminal 10 can be fixed or mobile and is also called by terms such as MS (mobile station), UT (user terminal), SS (Subscriber station), MT (mobile terminal), and wireless device. Generally, the base station 20 is a fixed station that communicates with the terminal 10 and is also called by terms such as eNB (evolved NodE-B), BTS (base transceiver system), and AP (access point).

[0065] The base stations 20 are connected to each other through an X2 interface. The base station 20 is connected to an EPC (evolved Packet core, 30) through an S1 interface, more specifically, to an MME (mobility management entity) through an S1-MME and to an S-GW (Serving gateway) through an S1-U.

[0066] The EPC30 is composed of an MME, an S-GW, and a P-GW (Packet data network-gateway). The MME has connection information of the terminal and information regarding the capabilities of the terminal, and such information is mainly used for the mobility management of the terminal. The S-GW is a gateway with the E-UTRAN as an endpoint, and the P-GW is a gateway with the PDN (Packet Date Network) as an endpoint.

[0067] The radio interface protocol layer between the terminal and the network is classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the well-known Open System Interconnection (OSI) reference model in a communication system. Among them, the physical layer belonging to the first layer provides an information transmission service using physical channels, and the RRC (Radio Resource Control) layer belonging to the third layer controls radio resources between the terminal and the network. For this purpose, the RRC layer exchanges RRC messages between the terminal and the base station.

[0068] Figure 3(a) shows a radio protocol architecture for a user plane according to an embodiment of the present invention.

[0069] Figure 3(b) shows a radio protocol architecture for a control plane according to an embodiment of the present invention. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

[0070] Referring to (a) and A3 of FIG. 3, the physical layer provides an information transmission service to the upper layer using a physical channel. The physical layer is connected to the upper layer MAC (Medium Access Control) layer via a transport channel. Data moves between the MAC layer and the physical layer via the transport channel. The transport channel is classified according to how the data is transmitted and what features it has by means of a radio interface.

[0071] Between different physical layers, that is, between the physical layers of the transmitter and the receiver, data moves via a physical channel. The physical channel is modulated by the OFDM (Orthogonal Frequency Division Multiplexing) method and utilizes time and frequency as radio resources.

[0072] The MAC layer provides a service to the upper layer RLC (radio link control) layer via a logical channel. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. Also, the MAC layer provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC layer provides a data transmission service on the logical channel.

[0073] The RLC layer performs concatenation, segmentation, and reassembly of RLC SDU (Serving Data Unit). To ensure various QoS (Quality of Service) required by a Radio Bearer (RB), the RLC layer provides three operating modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction by means of ARQ (automatic repeat request).

[0074] The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels, and physical channels in relation to the configuration, re-configuration, and release of radio bearers. An RB means a logical path provided by the first layer (physical layer or PHY layer) and the second layer (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer) for data transmission between the terminal and the network.

[0075] The functions of the PDCP layer in the user plane include the transmission of user data, header compression, and ciphering. The functions of the PDCP layer in the control plane include the transmission and ciphering / integrity protection of control plane data.

[0076] When an RB is configured, it means the process of defining the characteristics of radio protocol layers and channels to provide a specific service and setting each specific parameter and operation method. An RB is further divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

[0077] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the E-UTRAN, the terminal enters the RRC_CONNECTED state; otherwise, it enters the RRC_IDLE state. In the case of NR, the RRC_INACTIVE state is further defined. A terminal in the RRC_INACTIVE state can maintain the connection with the core network while releasing the connection with the base station.

[0078] As a downlink transmission channel for transmitting data to a terminal in a network, there are a BCH (Broadcast Channel) for transmitting system information and a downlink SCH (Shared Channel) for transmitting user traffic and control messages other than that. In the case of downlink multicast or block service traffic or control messages, they are transmitted via the downlink SCH or via another downlink MCH (Multicast Channel). On the other hand, as an uplink transmission channel for transmitting data from a terminal to a network, there are a RACH (Random Access Channel) for transmitting an initial control message and an uplink SCH (Shared Channel) for transmitting user traffic and control messages other than that.

[0079] Above the transmission channel, logical channels (Logical Channel) mapped to the transmission channel include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic Channel), etc.

[0080] The physical channel (Physical Channel) is composed of a plurality of OFDM symbols in the time domain and a plurality of subcarriers in the frequency domain. One subframe is composed of a plurality of OFDM symbols in the time domain. A resource block is a resource allocation unit and is composed of a plurality of OFDM symbols and a plurality of subcarriers. Also, each subframe can use specific subcarriers of a specific OFDM symbol (for example, the first OFDM symbol) of the corresponding subframe for the PDCCH (Physical Downlink Control Channel), that is, the L1 / L2 control channel. The TTI (Transmission Time Interval) is the unit time of subframe transmission.

[0081] Figure 4 shows the structure of the NR system according to an embodiment of the present invention.

[0082] Referring to Figure 4, the NG-RAN (Next Generation - Radio Access Network) includes a gNB (next generation - Node B cell) and / or an eNB that provides user plane and control plane protocol termination to the terminal. The case including only the gNB is illustrated in Figure 4. The gNB and the eNB are connected to each other by an Xn interface. The gNB and the eNB are connected to the 5th generation core network (5G Core Network: 5GC) by an NG interface. More specifically, it is connected to the AMF (access and mobility management function) by an NG-C interface and to the UPF (user plane function) by an NG-U interface.

[0083] Figure 5 shows the functional split between the NG-RAN and the 5GC according to an embodiment of the present invention.

[0084] Referring to FIG. 5, the gNB provides functions such as Inter Cell RRM, Radio Bearer control, Connection Mobility Control, Radio Admission Control, Measurement configuration & Provision, and dynamic resource allocation. The AMF provides functions such as NAS security and idle state mobility handling. The UPF provides functions such as Mobility Anchoring and PDU (Protocol Data Unit) processing. The SMF (Session Management Function) provides functions such as terminal IP (Internet Protocol) address allocation and PDU session control.

[0085] FIG. 6 shows the structure of the NR radio frame to which the embodiment of the present invention is applicable.

[0086] Referring to FIG. 6, in NR, radio frames are used for uplink and downlink transmissions. The radio frame has a length of 10 ms and is defined by two 5-ms half-frames (HF). The half-frame contains five 1-ms subframes (SF). The subframe is divided into one or more slots, and the number of slots in the subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols by means of a CP (cyclic prefix).

[0087] When the general CP is used, each slot contains 14 symbols. When the extended CP is used, each slot contains 12 symbols. Here, the symbol includes an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0088] Table 1 illustrates the number of symbols per slot (N slot symbol ), the number of slots per frame (N frame,u slot ), and the number of slots per subframe (N subframe,u slot ) according to the SCS setting (μ) when general CP is used.

[0089]

Table 1

[0090] Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to the SCS when extended CP is used.

[0091]

Table 2

[0092] In the NR system, the OFDM numerology (e.g., SCS, CP length, etc.) can be set differently between a plurality of cells merged into one terminal. Thereby, the (absolute time) intervals of time resources (e.g., subframes, slots, or TTIs) (for convenience, commonly referred to as TUs (Time Unit)) composed of the same number of symbols are set differently between the merged cells.

[0093] In NR, a number of new numerologies or SCSs are supported to assist various 5G services. For example, when the SCS is 15 kHz, a wide area in traditional cellular bands is supported. When the SCS is 30 kHz / 60 kHz, dense-urban areas, lower latency, and wider carrier bandwidth are supported. When the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.

[0094] The NR frequency band is defined by two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The numerical values of the frequency ranges are changeable. For example, the two types of frequency ranges are as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 means "sub 6GHz range", and FR2 means "above 6GHz range", which is also called millimeter wave (mmW).

[0095]

Table 3

[0096] As described above, the numerical values of the frequency ranges in the NR system are changeable. For example, FR1 includes a band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 includes a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included within FR1 includes an unlicensed band. The unlicensed band is used for various purposes, for example, for communication for vehicles (e.g., autonomous driving).

[0097]

Table 4

[0098] FIG. 7 is a diagram showing the slot structure of an NR frame according to an embodiment of the present invention.

[0099] Referring to FIG. 7, a slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one slot includes 14 symbols, while in the case of extended CP, one slot includes 12 symbols. Or in the case of normal CP, one slot includes 7 symbols, while in the case of extended CP, one slot includes 6 symbols.

[0100] A carrier wave includes a plurality of subcarriers in the frequency domain. An RB (Resource Block) is defined as a plurality (e.g., 12) of consecutive subcarriers in the frequency domain. A BWP is defined as a plurality of consecutive PRBs (Physical RBs) in the frequency domain and corresponds to one numerology (e.g., SCS, CP length, etc.). A carrier wave includes a maximum of N (e.g., 5) BWPs. Data communication is performed on the activated BWP. Each element is referred to as a resource element (RE) in the resource grid, and one complex symbol can be mapped.

[0101] On the other hand, the wireless interface between terminals or the wireless interface between a terminal and a network is composed of L1 layer, L2 layer, and L3 layer. In various embodiments of the present invention, the L1 layer means the physical layer. The L2 layer means any one of, for example, the MAC layer, RLC layer, PDCP layer, and SDAP layer. The L3 layer means, for example, the RRC layer.

[0102] Hereinafter, V2X or SL (Sidelink) communication will be described.

[0103] FIG. 8 shows a radio protocol architecture for SL communication according to an embodiment of the present invention. More specifically, FIG. 8(a) shows the user plane protocol stack of LTE, and FIG. 8(b) shows the control plane protocol stack of LTE.

[0104] FIG. 9 shows a radio protocol architecture for SL communication according to an embodiment of the present invention. More specifically, FIG. 9(a) shows the user plane protocol stack of NR, and FIG. 9(b) shows the control plane protocol stack of NR.

[0105] FIG. 10 shows a procedure for a terminal to perform V2X or SL communication in a transmission mode according to an embodiment of the present invention. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure. In various embodiments of the present invention, the transmission mode is also referred to as a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode is also referred to as the LTE transmission mode, and in NR, the transmission mode is also referred to as the NR resource allocation mode.

[0106] For example, FIG. 10(a) shows the terminal operations related to LTE transmission mode 1 or LTE transmission mode 3. For example, FIG. 10(a) shows the terminal 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.

[0107] For example, FIG. 10(b) shows the terminal operations related to LTE transmission mode 2 or LTE transmission mode 4. Or for example, FIG. 10(b) shows the terminal operations related to NR resource allocation mode 2.

[0108] Referring to Fig. 10(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station schedules the SL resources used by the terminal for SL transmission. For example, in step S8000, the base station transmits information related to the SL resources and / or information related to the UL resources to the first terminal. For example, the UL resources include PUCCH resources and / or PUSCH resources. For example, the UL resources are resources for reporting SL HARQ feedback to the base station.

[0109] For example, the first terminal receives information related to the DG (dynamic grant) resources and / or information related to the CG (configured grant) resources from the base station. For example, the CG resources include CG type 1 resources or CG type 2 resources. In this specification, the DG resources are resources that the base station sets / allocates to the first terminal via DCI (downlink control information). In this specification, the CG resources are (periodic) resources that the base station sets / allocates to the first terminal via DCI and / or RRC messages. For example, in the case of CG type 1 resources, the base station transmits an RRC message including information related to the CG resources to the first terminal. For example, in the case of CG type 2 resources, the base station transmits an RRC message including information related to the CG resources to the first terminal, and the base station transmits DCI related to the activation or release of the CG resources to the first terminal.

[0110] In step S8010, the first terminal transmits a PSCCH (e.g., SCI (Sidelink Control Information) or 1st-stage SCI) to the second terminal based on resource scheduling. In step S8020, the first terminal transmits a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second terminal. In step S8030, the first terminal receives a PSFCH related to the PSCCH / PSSCH from the second terminal. For example, HARQ feedback information (e.g., NACK information or ACK information) is received from the second terminal via the PSFCH. In step S8040, the first terminal transmits / reports the HARQ feedback information to the base station via the PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station is information generated based on the HARQ feedback information received by the first terminal from the second terminal. For example, the HARQ feedback information reported to the base station is information generated by the first terminal based on a preset rule. For example, the DCI is DCI for SL scheduling. For example, the format of the DCI is DCI format 3_0 or DCI format 3_1. Table 5 shows an example of DCI for SL scheduling.

[0111]

Table 5

[0112] Referring to FIG. 10(b), in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal determines the SL transmission resource within the SL resource set by the base station / network or the preset SL resource. For example, the set SL resource or the preset SL resource is a resource pool. For example, the terminal autonomously selects or schedules the resources for SL transmission. For example, the terminal selects the resources by itself within the set resource pool to perform SL communication. For example, the terminal performs the procedures of sensing and (re)selecting resources, and selects the resources by itself within the selection window. For example, this sensing is performed on a subchannel basis. For example, in step S8010, the first terminal that has selected the resources by itself within the resource pool uses this resource to transmit the PSCCH (e.g., SCI (Sidelink Control Information) or 1st-stage SCI) to the second terminal. In step S8020, the first terminal transmits the PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) related to the PSCCH to the second terminal. In step S8030, the first terminal receives the PSFCH related to the PSCCH / PSSCH from the second terminal.

[0113] Referring to FIG. 10(a) or (b), for example, the first terminal transmits an SCI to the second terminal on the PSCCH. Or, for example, the first terminal transmits two consecutive SCIs (e.g., 2-stage SCI) to the second terminal on the PSCCH and / or PSSCH. In this case, the second terminal decodes two consecutive SCIs (e.g., 2-stage SCI) to receive the PSSCH from the first terminal. In this specification, the SCI transmitted on the PSCCH is referred to as 1st SCI, First SCI, 1st-stage SCI, or 1st-stage SCI format, and the SCI transmitted on the PSSCH is referred to as 2nd SCI, Second SCI, 2nd-stage SCI, or 2nd-stage SCI format. For example, the 1st-stage SCI format includes SCI format 1-A, and the 2nd-stage SCI format includes SCI format 2-A and / or SCI format 2-B. Table 6 shows an example of the 1st-stage SCI format.

[0114] [Table 6]

[0115] Table 7 shows an example of the 2nd-stage SCI format.

[0116] [Table 7]

[0117] Referring to FIG. 10(a) or (b), in step S8030, the first terminal receives the PSFCH based on Table 8. For example, the first terminal and the second terminal determine the PSFCH resource based on Table 8, and the second terminal transmits HARQ feedback to the first terminal using the PSFCH resource.

[0118] [Table 8]

[0119] Referring to FIG. 10(a), in step S8040, the first terminal transmits SL HARQ feedback to the base station via PUCCH and / or PUSCH based on Table 9.

[0120] [Table 9]

[0121] Side link DRX (Discontinuous Reception)

[0122] The MAC entity is configured by the RRC as a DRX function that controls the UE's PDCCH monitoring activity for the MAC entity's C-RNTI, CI-RNTI, CS-RNTI, INT-RNTI, SFI-RNTI, SP-CSI-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI, AI-RNTI, SL-RNTI, SLCS-RNTI, and SL Semi-Persistent Scheduling V-RNTI. When using the DRX operation, the MAC entity needs to monitor up to the PDCCH according to a predetermined requirement. When DRX is configured in RRC_CONNECTED, the MAC entity monitors the PDCCH discontinuously for all activated serving cells.

[0123] The RRC controls the DRX operation by configuring the following parameters.

[0124] - drx-onDurationTimer: The duration at the start of the DRX cycle,

[0125] - drx-SlotOffset: The delay before the start of drx-onDurationTimer,

[0126] - drx-InactivityTimer: The subsequent duration when the PDCCH is a PDCCH indicating a new UL or DL transmission to the MAC entity.

[0127] - drx-RetransmissionTimerDL (per DL HARQ process except for the broadcast process): The maximum duration until a DL retransmission is received.

[0128] - drx-RetransmissionTimerUL (per UL HARQ process): The maximum period until an approval for a UL retransmission is received.

[0129] - drx-LongCycleStartOffset: Defines the subframe at which the Long and Short DRX cycles start, based on the Long DRX cycle and drx-StartOffset.

[0130] - drx-ShortCycle (optional): The short DRX cycle.

[0131] - drx-ShortCycleTimer (optional): The period during which the UE follows the short DRX cycle.

[0132] - drx-HARQ-RTT-TimerDL (per DL HARQ process except for the broadcast process): The minimum duration before a DL allocation for a HARQ retransmission is expected by the MAC entity.

[0133] - drx-HARQ-RTT-TimerUL (per UL HARQ process): The minimum duration before a UL HARQ retransmission approval is expected by the MAC entity.

[0134] - drx-RetransmissionTimerSL (per HARQ process): The maximum period until an approval for SL retransmission is received.

[0135] - drx-HARQ-RTT-TimerSL (per HARQ process): The minimum duration before an SL retransmission approval is predicted by the MAC entity.

[0136] - ps-Wakeup (optional): A configuration to start the connected drx-onDurationTimer when the DCP is monitored but not sensed.

[0137] - ps-TransmitOtherPeriodicCSI (optional): A configuration to report periodic CSI other than L1-RSRP on PUCCH during the duration indicated by the drx-onDurationTimer when the DCP is configured but the connected drx-onDurationTimer has not been started.

[0138] - ps-TransmitPeriodicL1-RSRP (optional): A configuration to transmit periodic CSI that is L1-RSRP on PUCCH during the time indicated by the drx-onDurationTimer when the DCP is configured but the connected drx-onDurationTimer has not been started.

[0139] The serving cell of the MAC entity is configured by RRC in two DRX groups with separate DRX parameters. If RRC does not configure the Secondary DRX group, there is only one DRX group, and all serving cells belong to that one DRX group. When two DRX groups are configured, each serving cell is uniquely assigned to each of the two groups. The DRX parameters set separately for each DRX group are drx-onDurationTimer and drx-InactivityTimer. The DRX parameters common to the DRX groups are as follows.

[0140] drx-onDurationTimer, drx-InactivityTimer.

[0141] The DRX parameters common to the DRX groups are as follows.

[0142] drx-SlotOffset, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycleStartOffset, drx-ShortCycle (optional), drx-ShortCycleTimer (optional), drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerUL.

[0143] Also, in the Uu DRX operation of the prior art, drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL are defined. When the UE performs HARQ retransmission, it is ensured that it can transition to the sleep mode during the RTT timer (drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerUL) or maintain the active state during the Retransmission Timer (drx-RetransmissionTimerDL, drx-RetransmissionTimerUL).

[0144] In addition, for the detailed content regarding SL DRX, the content regarding SL DRX in TS 38.321, R2-2111419 can be referred to as the prior art.

[0145] On the other hand, when the relay UE is in the IDLE / INACTIVE state and receives an RRC establishment / resume message from the remote UE, the relay UE attempts to connect to the base station. At this time, the relay UE attempting to connect can transmit including a cause value, and the value to be used as the cause value of the relay UE is being discussed in the standardization meeting. At this time, the cause value transmitted to the base station is used when the base station determines access control (admission control, barring approval or disapproval).

[0146] When the relay UE attempts to connect to the base station, it transmits an RRCResumeRequest IE, which contains information as shown in Table 10 below.

[0147]

Table 10

[0148] This resumeCause, which is the cause value transmitted to the base station during the current RRC establishment or resume, includes emergency, highPriorityAccess, mt-Access, mo-Signalling, mo-Data, mo-VoiceCall, mo-VideoCall, mo-SMS, rna-Update, mps-PriorityAccess, mcs-PriorityAccess, etc. (Refer to 3GPP TS 38.331).

[0149] Emergency indicates an emergency situation, highPriorityAccess indicates high access priority, mt-access indicates Mobile Terminating access, mo (Mobile Originating)-Signaling indicates access for the terminal's outgoing access, mo-data indicates access for data transmitted by the terminal, mo-VoiceCall indicates access for a VoiceCall, mo-VideoCall indicates access for a videocall, mo-SMS indicates access for SMS, rna-Update indicates access for the RAN-based Notification Area (RNA), mps-PriorityAccess indicates access related to MPS that allows an authorized user with qualifications to obtain priority access to the next available radio channel according to the priority order over other PLMN users, and mcs-PriorityAccess indicates access related to Mission Critical Service.

[0150] Regarding the above content, as a method for determining the cause value of the relay UE, there is a discussion on whether to use the conventional cause value as it is or define a new cause value for the relay, and the relevant content is shown in Table 11. When using the conventional cause value as it is, there is a method in which the relay UE uses the cause value received from the remote UE.

[0151]

Table 11

[0152] In connection with the foregoing description, hereinafter, when a relay UE attempts to establish an RRC connection after receiving a cause value from a remote UE in this disclosure, a method for determining the cause value will be described.

[0153] A relay UE according to this disclosure receives a first message including a first cause value from a remote UE (S1101 in FIG. 11). The relay UE sets / determines a second cause value based on the first cause value (S1102). Thereafter, the relay UE attempts to establish an RRC connection with the base station by transmitting a second message including the second cause value.

[0154] Here, the first message is related to the trigger for the attempt to establish an RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value. Specifically, based on the fact that the first cause value is a cause value related to emergency, the relay UE sets the second cause value in the same way as the first cause value. Also, based on the fact that the first cause value is a cause value other than the cause value related to emergency, the relay UE sets the second cause value regardless of the first cause value.

[0155] That is, among the cause values received from the remote UE, some of the upper important cause values are directly mapped to the cause values of the relay UE, and the cause values with low importance set the second cause value regardless of the first cause value. As an example of setting the second cause value regardless of the first cause value, the cause values can be grouped and mapped to values having relatively high ( / low) priority within the group, which will be described later.

[0156] Also, the cause value related to emergency may be a cause value with "emergency", or a cause value having the same priority / urgency / importance as emergency.

[0157] For example, when the cause value received by the relay UE from the remote UE is "emergency", the relay UE sets the second cause value to "emergency". When the cause value received by the relay UE from the remote UE is "mt-Access", "mo-Signalling", "mo-Data", "mo-VoiceCall", "mo-VideoCall", "mo-SMS", "rna-Update", etc., it can be set without being restricted by the received cause value.

[0158] As another example, cause values such as "emergency", "highPriorityAccess", "mt-Access", and "mo-Signalling" of the remote UE are directly mapped to the cause values of "emergency", "highPriorityAccess", "mt-Access", and "mo-Signalling" of the relay UE. Other cause values of the remote UE, such as "mo-data" and "mo-VoiceCall", are grouped and used as representative values for the cause values of the relay UE.

[0159] The relay UE may be in the RRC IDLE / INACTIVE state. Also, the first message triggers the switching of the relay UE to the RRC connected state. That is, in the RRC IDLE / INACTIVE state, based on the request of the remote UE, the UE requests the base station to switch to the RRC connected state for the remote UE.

[0160] The first message is either an RRC establishment or an RRC resume message. Also, the second message is either an RRC establishment or an RRC resume message. The first cause value is included in the ResumeCause information element related to the RRC Resume request.

[0161] By configuring as described above, the relay UE in the RRC IDLE / INACTIVE state can switch to the RRC connected state to effectively assist the remote UE for an emergency or a situation with a similar level of importance. This is clearly different from the conventional RRC establishment or RRC resume because the relay UE determines its own cause value based on the situation of the remote UE rather than its own situation.

[0162] Subsequently, cause values other than the cause values related to the aforementioned emergency may be included in one or more groups, and predetermined cause values are assigned to one or more groups. Also, the predetermined cause values are used as the second cause values. That is, the cause values received from the remote UE may be grouped, and the cause value of the relay UE may be used as the value representing the group. That is, the highest value or the lowest value of the group is used as the representative value for the cause value of the relay UE.

[0163] For example, cause values such as "emergency", "highPriorityAccess", "mt-Access", "mo-Signalling" are processed as one group, and the cause value of the remote UE is mapped to the "emergency" value, which has a relatively high priority within the group. That is, when the cause value of the remote UE is any one of "emergency", "highPriorityAccess", "mt-Access", "mo-Signalling", the cause value of the relay UE is set as the "emergency" value. This reflects the intention to handle these priorities more highly because the remote UE is trying to relay using its own power.

[0164] Alternatively, rules may be set so as to be mapped to "mo-Signalling" having a relatively low priority within the group. This is to give a higher priority when barring a UE present within the actual coverage in the expansion of coverage, a relatively low priority to the UE connected to the relay UE, and an even higher priority to the UE present within the actual coverage at the time of barring.

[0165] This operation, that is, the operation in which the base station maps the cause value of the remote UE to the cause value of the relay UE, may be such that the relay UE decodes the RRC establishment / resume message received from the remote UE and uses the message (after decoding) as the cause value of the relay UE as it is, or it may be the one that sets the method for the base station to map the cause value of the remote UE to the cause value of the relay UE.

[0166] In the former case, since there is no security problem with the RRC establishment / resume message received from the remote UE, the relay UE can decode it. Alternatively, instead of the relay UE decoding the RRC message of the remote UE, the remote UE can separately notify its own cause value. For example, the remote UE adds its own cause value to the adaptation layer (header). That is, when the remote UE transmits an RRC establishment or resume message, the cause value can also be added to the adaptation layer header. The relay UE that receives this can also extract the cause value from the adaptation layer.

[0167] The foregoing examples are an example of the cause value mapping method that can be set by the base station, and the specific method of mapping, the combination of cause values belonging to the group, etc. can be modified / changed and used within the range obvious to those of ordinary skill in the art according to the foregoing disclosure.

[0168] In the foregoing description, the relay UE includes at least one processor and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations. The operations include receiving a first message including a first cause value from a remote UE, setting a second cause value based on the first cause value, and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value. The first message is related to a trigger for the attempt to establish the RRC connection. Whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value. This is the relay UE.

[0169] Also, a processor for causing a relay UE to perform operations, the operations including receiving a first message including a first cause value from a remote UE, setting a second cause value based on the first cause value, and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value. The first message is related to a trigger for the attempt to establish the RRC connection. Whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value. This is the processor.

[0170] Also, a non-volatile computer-readable storage medium storing at least one computer program including instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a relay UE. The operations include receiving a first message including a first cause value from a remote UE, setting a second cause value based on the first cause value, and attempting to establish an RRC connection with a base station by transmitting a second message including the second cause value. The first message is related to a trigger for the attempt to establish the RRC connection. Whether the setting of the second cause value of the relay UE is dependent on the first cause value is determined based on the type of the first cause value. This is the storage medium.

[0171] On one hand, in a wireless communication system, a method for an operation related to side link relay of a base station, the method includes: the base station receives a second message related to an attempt of RRC connection, including a second cause value from a relay UE, and the base station determines whether to perform RRC connection of the relay UE based on the second cause value, where the second cause value is set based on the first cause value included in a first message received by the relay UE from a remote UE, the first message is related to a trigger of the attempt of RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value.

[0172] Further, the base station includes at least one processor and at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, where the operations include: the base station receives a second message related to an attempt of RRC connection, including a second cause value from a relay UE, and the base station determines whether to perform RRC connection of the relay UE based on the second cause value, where the second cause value is set based on the first cause value included in a first message received by the relay UE from a remote UE, the first message is related to a trigger of the attempt of RRC connection, and whether the setting of the second cause value of the relay UE is subordinate to the first cause value is determined based on the type of the first cause value.

[0173] Example of a communication system to which the present invention is applied

[0174] Without limitation, the various descriptions, functions, procedures, proposals, methods and / or flowcharts of the present invention disclosed in this specification can be applied to various fields that require wireless communication / connection between devices (e.g., 5G).

[0175] The following will describe in more detail with reference to the drawings. In the following figures / descriptions, the same reference numerals exemplify the same or corresponding hardware blocks, software blocks, or functional blocks unless otherwise specifically mentioned.

[0176] FIG. 12 illustrates a communication system 1 to which the present invention is applied.

[0177] Referring to FIG. 12, the communication system 1 to which the present invention is applied includes a wireless device, a base station, and a network. Here, the wireless device means a device that communicates using a wireless connection technology (e.g., 5G NR, LTE), and is also referred to as a communication / wireless / 5G device. Without being limited thereto, the wireless devices include a robot 100a, vehicles 100b-1, 100b-2, XR (Extended Reality) devices 100c, a hand-held device 100d, home appliances 100e, IoT (Internet of Thing) devices 100f, and an AI device / server 400. For example, the vehicles include vehicles equipped with a wireless communication function, autonomous driving vehicles, vehicles capable of vehicle-to-vehicle communication, etc. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). The XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and are embodied in the form of an HMD (Head-Mounted Device), a HUD (Head-Up Display) provided in a vehicle, a TV, a smartphone, a computer, a wearable device, a home appliance, a digital signboard, a vehicle, a robot, etc. The hand-held devices include smartphones, smart pads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., notebook computers, etc.). The home appliances include TVs, refrigerators, washing machines, etc. The IoT devices include sensors, smart meters, etc. For example, the base station and the network are also embodied in the wireless device, and a specific wireless device 200a can also operate as a base station / network node for other wireless devices.

[0178] Wireless devices 100a to 100f are connected to network 300 via base station 200. AI (Artificial Intelligence) technology is applied to wireless devices 100a to 100f, and wireless devices 100a to 100f are connected to AI server 400 via network 300. Network 300 is configured using a 3G network, 4G (e.g., LTE) network, or 5G (e.g., NR) network, etc. Wireless devices 100a to 100f can communicate with each other via base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0179] Wireless communications / connections 150a, 150b, and 150c are performed between wireless devices 100a to 100f / base station 200 and between base stations 200 / 200. Here, the wireless communications / connections are uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and inter-base station communication 150c (e.g., performed by various wireless connection technologies such as relay, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through wireless communications / connections 150a, 150b, and 150c, wireless devices and base stations / wireless devices, and base stations and base stations can send / receive wireless signals to / from each other. For example, wireless communications / connections 150a, 150b, and 150c can send / receive signals via various physical channels. For this purpose, based on various proposals of the present invention, any one of the setting process of various configuration information for sending / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation process is performed.

[0180] Example of a wireless device to which the present invention is applied

[0181] FIG. 12 illustrates a wireless device to which the present invention is applied.

[0182] Referring to FIG. 12, the first wireless device 100 and the second wireless device 200 transmit and receive wireless signals by various wireless connection technologies (e.g., LTE, NR). Here, {the first wireless device 100, the second wireless device 200} corresponds to {the wireless device 100x, the base station 200} and / or {the wireless device 100x, the wireless device 100x} in FIG. 12.

[0183] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 controls the memory 104 and / or the transceiver 106, and is configured to implement the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. For example, after the processor 102 processes the information in the memory 104 to generate a first information / signal, the transceiver 106 transmits a wireless signal including the first information / signal. Also, after the processor 102 receives a wireless signal including a second information / signal by the transceiver 106, the information obtained from the signal processing of the second information / signal is stored in the memory 104. The memory 104 is connected to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing part or all of the processes controlled by the processor 102, or for performing the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. Here, the processor 102 and the memory 104 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 106 is connected to the processor 102 and transmits and / or receives wireless signals through one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 can also be used interchangeably with an RF (radio Frequency) unit. In the present invention, the wireless device can also mean a communication modem / circuit / chip.

[0184] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 controls the memory 204 and / or the transceiver 206, and is configured to implement the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. For example, after the processor 202 processes the information in the memory 204 to generate third information / signals, the transceiver 206 transmits a wireless signal including the third information / signals. Also, after the processor 202 receives a wireless signal including fourth information / signals by the transceiver 206, the information obtained from the signal processing of the fourth information / signals is stored in the memory 204. The memory 204 is connected to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. Here, the processor 202 and the memory 204 are part of a communication modem / circuit / chip designed to implement wireless communication technologies (e.g., LTE, NR). The transceiver 206 is connected to the processor 202 and transmits and / or receives wireless signals through one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 can also be used interchangeably with an RF unit. In the present invention, the wireless device can also mean a communication modem / circuit / chip.

[0185] Hereinafter, the hardware elements of the wireless devices 100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers are implemented by one or more processors 102 and 202. For example, one or more processors 102 and 202 implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors 102 and 202 generate one or more PDUs (Protocol Data Units) and / or one or more SDUs (Service Data Units) according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. One or more processors 102 and 202 generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification. One or more processors 102 and 202 generate a signal (e.g., a baseband signal) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this specification, and provide it to one or more transceivers 106 and 206. One or more processors 102 and 202 receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206, and can obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification.

[0186] The one or more processors 102, 202 are also referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The one or more processors 102, 202 are implemented by hardware, firmware, software, or a combination thereof. As an example, the one or more processors 102, 202 include one or more ASICs (Application Specific Integrated Circuits), one or more DSPs (Digital Signal Processors), one or more DSPDs (Digital Signal Processing Devices), one or more PLDs (Programmable Logic Devices), or one or more FPGAs (Field Programmable Gate Arrays). The descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification are implemented using firmware or software, and the firmware or software is implemented to include modules, procedures, functions, and the like. The firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification is included in the one or more processors 102, 202 or stored in the one or more memories 104, 204 and driven by the one or more processors 102, 202. The descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification are implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0187] One or more memories 104, 204 are connected to one or more processors 102, 202 and store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories 104, 204 are composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. The one or more memories 104, 204 are located inside and / or outside the one or more processors 102, 202. Also, the one or more memories 104, 204 are connected to the one or more processors 102, 202 by various technologies such as wired or wireless connections.

[0188] One or more transceivers 106, 206 can transmit user data, control information, radio signals / channels, etc. mentioned in this specification, such as in a method and / or flowchart, to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, radio signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification from one or more other devices. For example, one or more transceivers 106, 206 are connected to one or more processors 102, 202 and transmit and receive radio signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106, 206 are connected to one or more antennas 108, 208, and one or more transceivers 106, 206 are configured to transmit and receive user data, control information, radio signals / channels, etc. mentioned in the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this specification via one or more antennas 108, 208. In this specification, one or more antennas are multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 convert received radio signals / channels, etc. from RF band signals to baseband signals (Convert) in order to process the received user data, control information, radio signals / channels, etc. using one or more processors 102, 202. One or more transceivers 106, 206 convert user data, control information, radio signals / channels, etc. processed using one or more processors 102, 202 from baseband signals to RF band signals. For this purpose, one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0189] Example of a vehicle or autonomous vehicle to which the present invention is applied

[0190] FIG. 12 illustrates a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle is embodied as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, or the like.

[0191] Referring to FIG. 12, the vehicle or the autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is part of the communication unit 110.

[0192] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls the elements of the vehicle or the autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The vehicle or the autonomous vehicle 100 travels on the ground by the driving unit 140a. The driving unit 140a includes an engine, a motor, a power train, wheels, brakes, a steering device, and the like. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100 and includes a wired / wireless charging circuit, a battery, and the like. The sensor unit 140c can obtain vehicle state, surrounding environment information, user information, and the like. The sensor unit 140c includes an IMU (Inertial Measurement Unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensing 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 illuminance sensor, a pedal position sensor, and the like. The autonomous driving unit 140d embodies technologies such as maintaining the lane during driving, automatically adjusting the speed like an adaptive cruise control, automatically driving along a predetermined route, and automatically setting and driving along a route when a destination is set.

[0193] As an example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a drive plan based on the obtained data. The control unit 120 controls the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan (for example, speed / direction adjustment). The communication unit 110 periodically obtains the latest traffic information data from the external server during autonomous driving and also obtains the surrounding traffic information data from the surrounding vehicles. Further, the sensor unit 140c obtains the vehicle state and the surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and the drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to the external server. The external server can predict the traffic information data in advance using AI technology, etc. based on the information collected from the vehicle or the autonomous driving vehicle and provide the predicted traffic information data to the vehicle or the autonomous driving vehicle.

[0194] Examples of AR / VR and vehicles to which the present invention is applied

[0195] FIG. 12 illustrates a vehicle to which the present invention is applied. The vehicle can also be embodied in a transportation means, a train, an aircraft, a ship, etc.

[0196] Referring to FIG. 12, the vehicle 100 includes a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, and a position measurement unit 140b.

[0197] The communication unit 110 transmits and receives signals (such as data, control signals, etc.) with external devices such as other vehicles or base stations. The control unit 120 can control the components of the vehicle 100 to perform various operations. The memory unit 130 stores data / parameters / programs / codes / instructions that support various functions of the vehicle 100. The input / output unit 140a outputs AR / VR objects based on the information in the memory unit 130. The input / output unit 140a includes a HUD. The position measurement unit 140b can obtain the position information of the vehicle 100. The position information includes the absolute position information of the vehicle 100, the position information within the driving lane, acceleration information, the position information with surrounding vehicles, etc. The position measurement unit 140b includes GPS and various sensors.

[0198] As an example, the communication unit 110 of the vehicle 100 receives map information, traffic information, etc. from an external server and stores them in the memory unit 130. The position measurement unit 140b obtains vehicle position information by means of GPS and various sensors and stores it in the memory unit 130. The control unit 120 generates a virtual object based on the map information, traffic information, vehicle position information, etc., and the input / output unit 140a displays the generated virtual object on the window inside the vehicle (1410, 140a). Also, the control unit 120 determines whether the vehicle 100 is operating correctly within the driving lane based on the vehicle position information. When the vehicle 100 abnormally deviates from the driving lane, the control unit 120 causes the input / output unit 140a to display a warning on the window inside the vehicle. Also, the control unit 120 broadcasts a warning message regarding abnormal driving to the surrounding vehicles through the communication unit 110. Depending on the situation, the control unit 120 can also transmit the vehicle's position information and information regarding driving / vehicle abnormalities to the relevant authorities through the communication unit 110.

[0199] Example of an XR device to which the present invention is applied

[0200] FIG. 12 illustrates an XR device to which the present invention is applied. The XR device is embodied in forms such as an HMD, a HUD (Head-Up Display) installed in a vehicle, a TV, a smartphone, a computer, a wearable device, a home appliance, a digital signboard, a vehicle, a robot, etc.

[0201] Referring to FIG. 12, the XR device 100a includes a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, a sensor unit 140b, and a power supply unit 140c.

[0202] The communication unit 110 can transmit and receive signals (such as media data, control signals, etc.) with external devices such as other wireless devices, mobile devices, or media servers. The media data includes video, images, sounds, etc. The control unit 120 controls the components of the XR device 100a to perform various operations. For example, the control unit 120 is configured to control and / or perform procedures such as video / image acquisition, (video / image) encoding, metadata generation and processing. The memory unit 130 stores data / parameters / programs / codes / instructions necessary for the driving of the XR device 100a / generation of XR objects. The input / output unit 140a obtains control information, data, etc. from the outside and outputs the generated XR objects. The input / output unit 140a includes a camera, a microphone, a user input unit, a display unit, a speaker, and / or a haptic module, etc. The sensor unit 140b obtains XR device status, surrounding environment information, user information, etc. The sensor unit 140b includes a proximity sensor, an illuminance 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, an optical sensor, a microphone, and / or a radar, etc. The power supply unit 140c supplies power to the XR device 100a and includes a wired / wireless charging circuit, a battery, etc.

[0203] As an example, the memory unit 130 of the XR device 100a contains information (such as data, etc.) necessary for the generation of XR objects (for example, AR / VR / MR objects). The input / output unit 140a can obtain instructions for operating the XR device 100a from the user, and the control unit 120 drives the XR device 100a according to the user's driving instructions. For example, when the user views a movie, news, etc. using the XR device 100a, the control unit 120 can transmit content request information to other devices (such as the mobile device 100b) or a media server through the communication unit 130. The communication unit 130 can download / stream content such as movies and news from other devices (such as the mobile device 100b) or a media server to the memory unit 130. The control unit 120 controls and / or performs procedures such as video / image acquisition, (video / image) encoding, and metadata generation / processing on the content, and generates / outputs XR objects based on information about the surrounding space or real objects obtained by the input / output unit 140a / sensor unit 140b.

[0204] The XR device 100a is wirelessly connected to the mobile device 100b by the communication unit 110, and the operation of the XR device 100a is controlled by the mobile device 100b. For example, the mobile device 100b operates as a controller for the XR device 100a. For this purpose, after obtaining the three-dimensional position information of the mobile device 100b, the XR device 100a can generate and output an XR entity corresponding to the mobile device 100b.

[0205] Example of a robot to which the present invention is applied

[0206] FIG. 12 illustrates a robot to which the present invention is applied. Robots can be classified into industrial, medical, household, military, etc. according to their usage purposes and fields.

[0207] Referring to FIG. 12, the robot 100 includes a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, a sensor unit 140b, and a driving unit 140c.

[0208] The communication unit 110 transmits and receives signals (e.g., driving information, control signals, etc.) to and from external devices such as other wireless devices, other robots, or control servers. The control unit 120 can control the components of the robot 100 to perform various operations. The memory unit 130 stores data / parameters / programs / codes / instructions that support various functions of the robot 100. The input / output unit 140a obtains information from outside the robot 100 and outputs information to the outside of the robot 100. The input / output unit 140a includes a camera, a microphone, a user input unit, a display unit, a speaker, and / or a haptics module, etc. The sensor unit 140b obtains internal information of the robot 100, surrounding environment information, user information, etc. The sensor unit 140b includes a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, a radar, etc. The driving unit 140c performs various physical operations such as moving the robot joints. Also, the driving unit 140c can make the robot 100 travel on the ground or fly in the air. The driving unit 140c includes an actuator, a motor, wheels, brakes, a propeller, etc.

[0209] Example of an AI device to which the present invention is applied

[0210] FIG. 12 illustrates an AI device to which the present invention is applied. The AI device is embodied in fixed devices or movable devices such as a TV, a projector, a smartphone, a PC, a notebook computer, a digital broadcast terminal, a tablet PC, a wearable device, a set-top box (STB), a radio, a washing machine, a refrigerator, a digital signage, a robot, a vehicle, etc.

[0211] Referring to FIG. 12, the AI device 100 includes a communication unit 110, a control unit 120, a memory unit 130, input / output units 140a / 140b, a running processor unit 140c, and a sensor unit 140d.

[0212] The communication unit 110 transmits and receives wired / wireless signals (such as sensor information, user input, learning models, control signals, etc.) to / from external devices such as other AI devices (e.g., 100x, 200, 400 in FIG. 12) and AI servers (e.g., 400 in FIG. 12) using wired / wireless communication technologies. For this purpose, the communication unit 110 transmits the information in the memory unit 130 to an external device, or transmits the signal received from an external device to the memory unit 130.

[0213] Based on the information determined or generated using data analysis algorithms or machine learning algorithms, the control unit 120 determines one executable operation of the AI device 100. Also, the control unit 120 can control the components of the AI device 100 to perform the determined operation. For example, the control unit 120 can request, search, receive, or utilize the data of the running processor unit 140c or the memory unit 130, and control the components of the AI device 100 to execute the predicted operation or the operation determined to be desirable among the executable operations. Further, the control unit 120 can collect the history information including the operation content of the AI device 100 and the user feedback on the operation, and store it in the memory unit 130 or the running processor unit 140c, or transmit it to an external device such as an AI server (FIG. 12, 400). The collected history information is used when updating the learning model.

[0214] The memory unit 130 stores data that supports various functions of the AI device 100. For example, the memory unit 130 stores the data obtained from the input unit 140a, the data obtained from the communication unit 110, the output data of the running processor unit 140c, and the data obtained from the sensing unit 140. Also, the memory unit 130 stores the control information and / or software code necessary for the operation / execution of the control unit 120.

[0215] The input unit 140a obtains various types of data from outside the AI device 100. For example, the input unit 140a obtains training data for model learning, input data to which the learned model is applied, and the like. The input unit 140a includes a camera, a microphone, and / or a user input unit, etc. The output unit 140b generates outputs related to vision, hearing, touch, etc. The output unit 140b includes a display unit, a speaker, and / or a haptics module, etc. The sensing unit 140 obtains any one of the internal information of the AI device 100, the surrounding environment information of the AI device 100, and user information using various sensors. The sensing unit 140 includes a proximity sensor, an illuminance 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, etc.

[0216] The running processor unit 140c learns a model composed of an artificial neural network using training data. The running processor unit 140c performs AI processing together with the running processor unit of the AI server (FIG. 12, 400). The running processor unit 140c processes the information received from an external device by the communication unit 110 and / or the information stored in the memory unit 130. Also, the output value of the running processor unit 140c is transmitted to an external device by the communication unit 110 or stored in the memory unit 130.

Industrial Applicability

[0217] The above embodiment can be applied to various mobile communication systems.

Claims

1. A method for providing a relay user equipment (UE) receiving a first message from a remote UE, the first message including a first cause value among a plurality of first cause values; the relay UE setting a second cause value based on the first cause value; and the relay UE attempts to connect to a base station (BS) by transmitting a second message including the second cause value; the second cause value is the same as the received first cause value based on the received first cause value being one of a particular subset of at least one first cause value among the plurality of first cause values; a number of first cause values ​​in the particular subset is less than the plurality of first cause values; The method of claim 1, wherein the received first cause value is included in a cause value group and the second cause value is set as a representative cause value of the cause value group based on the received first cause value having a priority lower than a predetermined priority.

2. The method described in claim 1, wherein the received first cause value is related to an emergency and belongs to the specific subset of first cause values.

3. The method of claim 1 , wherein the relay UE sets the second cause value independently of the first cause value based on the first cause value not being related to an emergency.

4. The method described in claim 3, wherein the relay UE sets the second cause value to a predetermined cause value based on the first cause value being not related to an emergency.

5. The method of claim 1 , wherein the relay UE is in an RRC IDLE / INACTIVE state.

6. The method of claim 1 , wherein the first message triggers a switch of an RRC connection state of the relay UE.

7. The method of claim 6 , wherein the first message is one of an RRC establishment or an RRC resumption message.

8. The method of claim 1 , wherein the first cause value is included in a ResumeCause information element associated with an RRC Resume request.

9. At least one processor; at least one computer memory operatively coupled to said at least one processor and configured to store instructions that, when executed, cause said at least one processor to perform operations; The operation includes: receiving a first message from a remote user equipment (UE), the first message including a first cause value among a plurality of first cause values; setting a second cause value based on the received first cause value; and attempting to associate with a base station (BS) by transmitting a second message including the second cause value; the second cause value is the same as the received first cause value based on the received first cause value being one of a particular subset of at least one first cause value among the plurality of first cause values; a number of first cause values ​​in the particular subset is less than the plurality of first cause values; A relay UE, wherein based on the received first cause value having a priority lower than a predetermined priority, the received first cause value is included in a cause value group, and the second cause value is set as a cause value representing the cause value group.

10. A processor for performing operations for a relay user equipment (UE), comprising: The operation includes: receiving a first message from a remote UE, the first message including a first cause value among a plurality of first cause values; setting a second cause value based on the received first cause value; and attempting to connect to a base station (BS) by transmitting a second message including the second cause value; the second cause value is the same as the received first cause value based on the received first cause value being one of a particular subset of at least one first cause value among the plurality of first cause values; a number of first cause values ​​in the particular subset is less than the plurality of first cause values; A processor, based on the received first cause value having a priority lower than a predetermined priority, the received first cause value is included in a cause value group and the second cause value is set as a representative cause value of the cause value group.

11. A non-volatile computer-readable storage medium for storing at least one computer program comprising instructions, when executed by at least one processor, for causing the at least one processor to perform an operation for a relay user equipment (UE), The operation includes: receiving a first message from a remote UE, the first message including a first cause value among a plurality of first cause values; setting a second cause value based on the first cause value; and attempting to connect to a base station (BS) by transmitting a second message including the second cause value; the second cause value is the same as the received first cause value based on the received first cause value being one of a particular subset of at least one first cause value among the plurality of first cause values; a number of first cause values ​​in the particular subset is less than the plurality of first cause values; A storage medium, wherein based on the received first cause value having a priority lower than a predetermined priority, the received first cause value is included in a cause value group and the second cause value is set as a cause value representing the cause value group.

12. 1. A method of operation relating to a sidelink relay in a base station (BS) in a wireless communication system, comprising: receiving a second message from a relay user equipment (UE) including a second cause value; determining whether to perform a connection of the relay UE based on the second cause value; the second cause value is set by the relay UE based on a first cause value included in a first message received by the relay UE from a remote UE; the second cause value is the same as the first cause value based on the first cause value being one of a particular subset of at least one first cause value among a plurality of first cause values; and a number of first cause values ​​in the particular subset is less than the plurality of first cause values; The method of claim 1, wherein the received first cause value is included in a cause value group and the second cause value is set as a representative cause value of the cause value group based on the received first cause value having a priority lower than a predetermined priority.

13. A base station (BS) in a wireless communication system, At least one processor; at least one computer memory operatively coupled to said at least one processor and configured to store instructions that, when executed, cause said at least one processor to perform operations; The operation includes: receiving a second message from a relay user equipment (UE) including a second cause value; determining whether to perform a connection of the relay UE based on the second cause value; the second cause value is set by the relay UE based on a first cause value included in a first message received from a remote UE; the second cause value is the same as the first cause value based on the first cause value being one of a particular subset of at least one first cause value among a plurality of first cause values; a number of first cause values ​​in the particular subset is less than the plurality of first cause values; A BS, based on the received first cause value having a priority lower than a predetermined priority, the received first cause value is included in a cause value group, and the second cause value is set as a cause value representing the cause value group.

Images