Methods and apparatus for L2-based UE-to-network relay operation in wireless communication networks

Abstract

This disclosure relates to 5G or 6G communication systems for supporting higher data transmission rates. Methods and apparatus for Layer 2 (L2) sidelink (SL) user equipment (UE) to network relay operations in a wireless communication network are also included. A method for operating a first UE includes receiving from a second UE a message including auxiliary information for relay operations between the first and second UEs, and receiving a short message from a base station (BS). The method further includes acquiring a first system information block, including an Earthquake and Tsunami Warning System / Commercial Mobile Alert Service (ETWS / CMAS) notification, or a second system information block of the second UE, based on information in the short message, and transmitting the acquired first system information block or the acquired second system information block to the second UE via a sidelink channel.

Description

Technical Field

[0001] This disclosure generally relates to wireless communication systems, and more specifically, to a Layer 2 (L2) sidelink (SL)-based user equipment (UE) to network relay operation in a wireless communication network. Background Technology

[0002] 5G mobile communication technology defines a wide frequency band, enabling high transmission rates and new services. It can be implemented not only in "sub-6GHz" bands such as 3.5GHz, but also in "above 6GHz" bands, including 28GHz and 39GHz, known as mmWave. Furthermore, 6G mobile communication technology (referred to as "super 5G systems") is being considered in terahertz bands (e.g., the 95GHz to 3THz band) to achieve transmission rates fifty times faster than 5G and ultra-low latency one-tenth that of 5G.

[0003] At the outset of 5G mobile communication technology development, standardization was underway regarding beamforming and massive MIMO to support services and meet performance requirements associated with enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC). This included measures to mitigate radio wave path loss in millimeter waves and increase transmission distance; digitalization to support dynamic operation of millimeter wave resources and time slot formats (e.g., operating multiple subcarrier spacings); initial access technologies to support multi-beam transmission and broadband; the definition and operation of bandwidth portion (BWP); new channel coding methods such as LDPC (low-density parity-check) codes for large-volume data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] Currently, given the services supported by 5G mobile communication technology, discussions are underway regarding improvements and performance enhancements to the initial 5G mobile communication technology. Physical layer standardization for technologies such as V2X (Vehicle-to-Everything) is also in place. This standardization is used to assist autonomous vehicle driving decisions based on information about the vehicle's location and status transmitted by the vehicle, and to enhance user convenience. NR-U (New Radio Unlicensed) is designed to comply with various regulatory requirements related to system operation in unlicensed frequency bands. NR UE power saving and non-terrestrial networks (NTN) are UE-satellite direct communication used to provide coverage and positioning in areas where communication with terrestrial networks is unavailable.

[0005] Furthermore, standardization is ongoing in air interface architectures / protocols for technologies such as the Industrial Internet of Things (IIoT) to support new services through interoperability and convergence with other industries, IAB (Integrated Access and Backhaul) for nodes to provide network service area extension by supporting wireless backhaul and access links in an integrated manner, mobility enhancements including conditional handover and DAPS (Dual Active Stack) handover, and two-step random access (two-step RACH for NR) to simplify the random access process. Standardization is also underway for 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as system architectures / services for Mobile Edge Computing (MEC) based on UE location reception services.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will be connected to the communication network, thus necessitating enhanced functionality and performance of 5G mobile communication systems, as well as integrated operation of connected devices. To this end, new research related to extended reality (XR) has been initiated to effectively support AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality), etc., by leveraging artificial intelligence (AI) and machine learning (ML), AI service support, metaspace service support, and drone communication to improve 5G performance and reduce complexity.

[0007] Furthermore, this development of 5G mobile communication systems will not only serve as the foundation for developing new waveforms for providing terahertz band coverage in 6G mobile communication technologies, such as full-dimensional MIMO (FD-MIMO), multi-antenna transmission technologies like array antennas and massive MIMO, metamaterial-based lenses and antennas for improving terahertz band signal coverage, high-dimensional spatial multiplexing technologies using OAM (orbital angular momentum) and RIS (reconfigurable smart surfaces), and full-duplex technologies for improving the frequency efficiency of 6G mobile communication technologies and enhancing system networks, but also for AI-based communication technologies to achieve system optimization by leveraging satellites and AI (artificial intelligence) from the design phase and internalizing end-to-end AI support capabilities, and next-generation distributed computing technologies to achieve services with complexity levels exceeding UE operational capability limits by utilizing ultra-high-performance communication and computing resources. Summary of the Invention

[0008] Solution to the problem

[0009] In one embodiment, a first user equipment (UE) is provided in a wireless communication system. The first UE includes a transceiver configured to receive messages from a second UE including auxiliary information for relay operations between the first and second UEs, and to receive short messages from a base station (BS). The first UE also includes a processor operatively coupled to the transceiver. The processor is configured to acquire, based on information in the short message, a first system information block including an Earthquake and Tsunami Warning System / Commercial Mobile Alert Service (ETWS / CMAS) notification or a second system information block of the second UE. The transceiver is further configured to transmit the acquired first system information block or the acquired second system information block to the second UE via a sidelink channel.

[0010] Advantages of the invention

[0011] According to embodiments of this disclosure, a method and apparatus for L2-based SL UE-to-network relay operation in a wireless communication network are provided. Attached Figure Description

[0012] To gain a more complete understanding of this disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals denote like parts:

[0013] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0014] Figure 2 An example gNB according to an embodiment of this disclosure is shown;

[0015] Figure 3 An example UE according to an embodiment of the present disclosure is shown;

[0016] Figure 4 and Figure 5 An example wireless transmission and reception path according to this disclosure is shown;

[0017] Figure 6 An example V2X communication on a side link according to an embodiment of this disclosure is illustrated;

[0018] Figure 7 An example of an L2-based SL UE-to-network relay scenario according to an embodiment of the present disclosure is shown;

[0019] Figure 8A An example L2-based SL UE-to-network relay user plane protocol architecture according to an embodiment of the present disclosure is shown;

[0020] Figure 8B An example L2-based SL UE-to-network relay control plane protocol architecture according to an embodiment of the present disclosure is shown;

[0021] Figure 9 The signaling flow for SL-based UE-to-network relay operation is illustrated according to an embodiment of the present disclosure;

[0022] Figure 10 Another signaling flow for SL-based UE-to-network relay operation is shown according to an embodiment of this disclosure;

[0023] Figure 11 An example block diagram of a base station configuration according to an embodiment of the present disclosure is shown; and

[0024] Figure 12 An example block diagram illustrating the structure of a terminal according to an embodiment of the present disclosure is shown. Detailed Implementation

[0025] This disclosure relates to wireless communication systems, and more specifically, to an L2-based UE-to-network relay operation in a wireless communication network.

[0026] In one embodiment, a first user equipment (UE) is provided in a wireless communication system. The first UE includes a transceiver configured to receive messages from a second UE including auxiliary information for relay operations between the first and second UEs, and to receive short messages from a base station (BS). The first UE also includes a processor operatively coupled to the transceiver. The processor is configured to acquire, based on information in the short message, a first system information block including an Earthquake and Tsunami Warning System / Commercial Mobile Alert Service (ETWS / CMAS) notification or a second system information block of the second UE. The transceiver is further configured to transmit the acquired first system information block or the acquired second system information block to the second UE via a sidelink channel.

[0027] In another embodiment, a second UE is provided in a wireless communication system. The second UE includes a processor and a transceiver operatively connected to the processor. The transceiver is configured to transmit messages including auxiliary information for relay operations between the first UE and the second UE to a first UE via a sidelink channel, and to receive from the first UE a first system information block including ETWS / CMAS notification or a second system information block from the second UE. The first system information block or the second system information block is received from a base station via the first UE.

[0028] In yet another embodiment, a method for operating a first UE in a wireless communication system is provided. The method includes receiving a message from a second UE including auxiliary information for relay operations between the first UE and the second UE, and receiving a short message from a BS. The method further includes acquiring a first system information block including an ETWS / CMAS notification or a second system information block of the second UE based on information in the short message, and transmitting the acquired first system information block or the acquired second system information block to the second UE via a sidelink channel.

[0029] Invention Model

[0030] Other technical features will be apparent to those skilled in the art from the following figures, description and claims.

[0031] Before proceeding with the following description, it may be advantageous to define certain words and phrases used throughout this patent document. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether these elements are physically in contact with each other. The terms “transmit,” “receive,” and “communicate,” and their derivatives encompass both direct and indirect communication. The terms “comprise” and “include,” and their derivatives mean inclusion without limitation. The term “or” is inclusive, meaning and / or. The phrase “associated with,” and its derivatives mean including, being included within, interconnected with, containing, being contained within, connected or connected to, coupled or coupled with, capable of communicating with, cooperating with, intertwined, parallel, proximate, combined or combined with, having, possessing the nature of, related to, or relating to, etc. The term “controller” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware, or a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, either local or remote. When used with a list of items, the phrase "at least one of..." means that different combinations of one or more of the listed items can be used, and only one item in the list may be required. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0032] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media in which data can be permanently stored and media in which data can be stored and subsequently overwritten, such as rewritable optical discs or erasable memory devices.

[0033] Definitions of certain other words and phrases are provided throughout this patent document. Those skilled in the art will understand that, in many instances (if not most), such definitions apply to both prior and future use of such defined words and phrases.

[0034] The following discussion in this patent document Figures 1 to 12 The various embodiments used to describe the principles of this disclosure are for illustrative purposes only and should not be construed as limiting the scope of this disclosure in any way. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitable system or apparatus.

[0035] The following documents are incorporated herein by reference, as if fully set forth herein: 3GPP TS38.321v16.3.0, “Medium Access Control (MAC) protocol specification”; 3GPP TS38.331v.16.3.0, “Radio Resource Control (RRC) protocol specification”; and 3GPPTR 38.885v.16.0.0, “Study on NR Vehicle-to-Everything (V2X)”; 3GPP TR 36.746:v.15.1.1, “Study on further enhancements to LTE Device-to-Device (D2D), User Equipment (UE) to network relays for Internet of Things (IoT) and wearables”; 3GPPTR 38.836v.0.1.0, “Study on NR sidelink relay”; 3GPP TS 38.304v.16.3.0 "UserEquipment(UE) procedures in idle mode and RRC inactive state"; and 3GPP TS38.212v.16.4.0 "Multiplexing and channel coding".

[0036] The following Figures 1-3 Various embodiments are described in wireless communication systems and implementations using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication technologies. Figures 1-3 The description does not imply any physical or architectural limitation on the ways in which different embodiments may be implemented. Different embodiments of this disclosure can be implemented in any suitable communication system.

[0037] Figure 1 An example wireless network according to an embodiment of this disclosure is shown. Figure 1 The embodiments of the wireless network shown are for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0038] like Figure 1As shown, the wireless network includes gNB 101 (e.g., a base station, BS), gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0039] gNB 102 provides wireless broadband access to network 130 to a first plurality of UEs within its coverage area 120. The first plurality of UEs includes UE 111, which may be located in a small business; UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M) such as a cellular phone, wireless laptop, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 to a second plurality of UEs within its coverage area 125. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of gNBs 101-gNB 103 may communicate with each other and with UEs 111-UE 116 using 5G / NR, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0040] Depending on the network type, the term "base station" or "BS" can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmitting point (TP), a transmitting-receiving point (TRP), an enhanced base station (eNodeB or eNB), a 5G / NR base station (gNB), a macro cell, a femtocell, a WiFi access point (AP), or other wireless enabling devices. A base station can provide wireless access according to one or more wireless communication protocols, such as 5G / NR 3rd Generation Partnership Project (3GPP) NR, Long Term Evolution (LTE), Advanced LTE (LTE-A), High Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "user equipment" or "UE" can refer to any component such as a "mobile station," "subscriber station," "remote terminal," "wireless terminal," "receiving point," or "user device." For convenience, the terms “user equipment” and “UE” are used in this patent document to refer to a remote wireless device that wirelessly accesses a base station, whether the UE is a mobile device (such as a mobile phone or smartphone) or a device that is generally considered to be stationary (such as a desktop computer or vending machine).

[0041] The dashed lines show the approximate extent of coverage areas 120 and 125, which are shown as generally circular for illustrative and explanatory purposes only. It should be clearly understood that, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles, the coverage areas associated with the gNB (such as coverage areas 120 and 125) may have other shapes, including irregular shapes.

[0042] As described in more detail below, one or more of UEs 111-UE 116 include circuitry, programming, or a combination thereof for SL network-assisted inter-UE coordination in a wireless communication system. In some embodiments, one or more of gNBs 101-gNBs 103 include circuitry, programming, or a combination thereof for SL network-assisted inter-UE coordination in a wireless communication system.

[0043] As discussed in more detail below, wireless network 100 may have communication facilitated via one or more devices (e.g., SB 111A to 111C) that may have SL communication with SB 111. SB 111 may communicate directly with SB 111A to 111C via a set of SLs (e.g., SL interfaces) to provide sideline communication, for example, in cases where SB 111A to 111C are remotely located or otherwise require facilitating network access connections beyond traditional fronthaul and / or backhaul connections / interfaces or other than traditional fronthaul and / or backhaul connections / interfaces (e.g., BS 102). In one example, SB 111 may have direct communication with SB 111A to 111C via SL communication with or without BS 102 support. Various UEs (e.g., as depicted as UEs 112 to 116) may be able to communicate with one or more of their other UEs (such as UEs 111A to 111C for SB 111).

[0044] although Figure 1 An example of a wireless network is shown, but more can be found on... Figure 1 Various modifications can be made. For example, the wireless network can include any number of gNBs and any number of UEs in any suitable arrangement. Furthermore, gNB 101 can communicate directly with any number of UEs and provide these UEs with wireless broadband access to network 130. Similarly, each gNB 102-gNB 103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Additionally, gNB 101, gNB 102, and / or gNB 103 can provide access to other or additional external networks (such as external telephone networks or other types of data networks).

[0045] Figure 2 An example gNB 102 according to an embodiment of this disclosure is shown. Figure 2 The embodiment of gNB 102 shown is for illustrative purposes only, and Figure 1 The gNB 101 and gNB 103 can have the same or similar configurations. However, gNBs have a wide variety of configurations, and Figure 2 This disclosure is not intended to limit the scope of any particular implementation of gNB.

[0046] like Figure 2 As shown, gNB 102 includes multiple antennas 205a-205n, multiple RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0047] RF transceivers 210a-210n receive incoming RF signals from antennas 205a-205n, such as signals transmitted by a UE in network 100 or other UEs on a sidelink. RF transceivers 210a-210n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are transmitted to RX processing circuitry 220, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 220 sends the processed baseband signals to controller / processor 225 for further processing.

[0048] The TX processing circuit 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuit 215 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 210a-210n receive the outgoing processed baseband or IF signal from the TX processing circuit 215 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 205a-205n.

[0049] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the RF transceivers 210a-210n, the RX processing circuitry 220, and the TX processing circuitry 215 to receive uplink channel signals and transmit downlink channel signals, based on known principles. The controller / processor 225 may also support additional functions, such as more advanced wireless communication capabilities. For example, the controller / processor 225 may support beamforming or directional routing operations in which outgoing / incoming signals from / to multiple antennas 205a-205n are weighted differently to effectively direct outgoing signals in a desired direction. Any of a wide variety of other functions may be supported by the controller / processor 225 within the gNB 102.

[0050] The controller / processor 225 is also capable of executing programs and other processes, such as an operating system, residing in the memory 230. The controller / processor 225 can move data into or out of the memory 230 as needed for the execution process.

[0051] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or over a network. Interface 235 can support communication via any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as a system supporting 5G / NR, LTE, or LTE-A), interface 235 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, interface 235 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). Interface 235 includes any suitable architecture supporting communication via wired or wireless connections, such as Ethernet or RF transceivers.

[0052] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

[0053] although Figure 2 An example of gNB 102 is shown, but it is possible to compare it with other models. Figure 2 Various changes can be made. For example, gNB 102 can include any number of Figure 2Each component is shown. As a specific example, an access point may include multiple interfaces 235, and a controller / processor 225 may support enhanced resource allocation. As another specific example, although shown as a single instance including TX processing circuitry 215 and a single instance including RX processing circuitry 220, gNB 102 may include multiple instances of each (such as one per RF transceiver). Furthermore, components may be combined, further subdivided, or omitted. Figure 2 It includes various components and allows for the addition of additional components as needed.

[0054] Figure 3 An example UE 116 according to an embodiment of this disclosure is shown. Figure 3 The embodiment of UE 116 shown is for illustrative purposes only. Figure 1 UEs 111-UE 115 can have the same or similar configurations. However, UEs have a wide variety of configurations, and Figure 3 This disclosure is not intended to limit the scope of any particular implementation of the UE.

[0055] like Figure 3 As shown, UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a TX processing circuit 315, a microphone 320, and a receive (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, a touchscreen 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0056] RF transceiver 310 receives incoming RF signals transmitted by a gNB of network 100 from antenna 305. RF transceiver 310 down-converts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (e.g., for voice data) or processor 340 for further processing (e.g., for web browsing data).

[0057] The TX processing circuit 315 receives analog or digital voice data from the microphone 320 or other outgoing baseband data (such as network data, email, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.

[0058] Processor 340 may include one or more processors or other processing devices and executes OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor 340 may control the RF transceiver 310, RX processing circuitry 325, and TX processing circuitry 315 to receive downlink and / or sidelink channel signals and transmit uplink and / or sidelink channel signals according to known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

[0059] Processor 340 is also capable of executing other processes and programs residing in memory 360, such as processes for enhancing resource allocation. Processor 340 can move data into or out of memory 360 as needed for the execution process. In some embodiments, processor 340 is configured to execute application 362 based on OS 361 or in response to signals received from gNB or operator. Processor 340 is also coupled to I / O interface 345, which provides UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.

[0060] The processor 340 is also coupled to the touchscreen 350 and the display 355. The operator of the UE 116 can use the touchscreen 350 to input data into the UE 116. The display 355 may be a liquid crystal display, a light-emitting diode display, or other display capable of displaying text (such as from a website) and / or at least limited graphics.

[0061] The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).

[0062] although Figure 3 An example of UE 116 is shown, but it is possible to modify it. Figure 3 Make various changes. For example, you can combine, further subdivide, or omit. Figure 3The processor 340 can be divided into various components, and additional components can be added as needed. As a specific example, the processor 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although... Figure 3 The UE 116 is shown configured as a mobile phone or smartphone, but the UE can be configured to operate as other types of mobile or stationary devices.

[0063] To meet the increased demand for wireless data traffic since the deployment of fourth-generation (4G) communication systems and to enable various vertical applications, 5G / NR communication systems have been developed and are currently being deployed. The implementation of 5G / NR communication systems in higher frequency (mmWave) bands (e.g., 28 GHz or 60 GHz bands) is considered for higher data rates, or in lower frequency bands (such as 6 GHz) for robust coverage and mobility support. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G / NR communication systems.

[0064] In addition, in 5G / NR communication systems, development is underway to improve the system network based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and receiver interference cancellation.

[0065] The discussion of 5G systems and associated frequency bands is provided for reference, as certain embodiments of this disclosure can be implemented in 5G systems. However, this disclosure is not limited to 5G systems or associated frequency bands, and embodiments of this disclosure can be utilized in conjunction with any frequency band. For example, aspects of this disclosure can also be applied to 5G communication systems, 6G, or even higher versions that may use terahertz (THz) frequency bands.

[0066] The communication system includes downlink (DL) which refers to the transmission from a base station or one or more transmitting points to a UE, uplink (UL) which refers to the transmission from a UE to a base station or one or more receiving points, and sidelink (SL) which refers to the transmission from one or more UEs to one or more UEs.

[0067] The time unit used for DL ​​signaling or UL signaling on a cell is called a time slot, and it may include one or more symbols. Symbols can also serve as additional time units. Frequency (or bandwidth (BW)) units are called resource blocks (RBs). An RB includes multiple subcarriers (SCs). For example, a time slot may have a duration of 0.5 milliseconds or 1 millisecond, include 14 symbols, and an RB may include 12 SCs with an inter-SC spacing of 15 kHz or 30 kHz, and so on.

[0068] DL signals include data signals that transmit information content, control signals that transmit DL control information (DCI), and reference signals (RS), also known as pilot signals. The gNB transmits data information or DCI via the corresponding Physical DL Shared Channel (PDSCH) or Physical DL Control Channel (PDCCH). PDSCH or PDCCH can be transmitted on a variable number of time slot symbols, each comprising one time slot symbol. For simplicity, the DCI format used to schedule PDSCH reception by the UE is referred to as the DL DCI format, and the DCI format used to schedule transmission from the UE's Physical Uplink Shared Channel (PUSCH) is referred to as the UL DCI format.

[0069] The gNB transmits one or more types of RS, including Channel State Information RS (CSI-RS) and Demodulation RS (DMRS). CSI-RS is primarily intended for the UE to perform measurements and provide CSI to the gNB. For channel measurements, the Non-Zero Power CSI-RS (NZP CSI-RS) resource is used. For Interference Measurement Reporting (IMR), the CSI Interference Measurement (CSI-IM) resource associated with the Zero Power CSI-RS (ZP CSI-RS) configuration is used. The CSI process includes both NZP CSI-RS and CSI-IM resources.

[0070] The UE can determine the CSI-RS transmission parameters via DL control signaling or higher-level signaling (such as Radio Resource Control (RRC) signaling) from the gNB. The transmission instance of CSI-RS can be indicated by DL control signaling or configured by higher-level signaling. DMRS is transmitted only in the BW of the corresponding PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0071] Figure 4 and Figure 5Example wireless transmit and receive paths according to this disclosure are illustrated. In the following description, transmit path 400 may be described as being implemented in a gNB (such as gNB 102), and receive path 500 may be described as being implemented in a UE (such as UE 116). However, it is understood that receive path 500 may be implemented in a gNB, and transmit path 400 may be implemented in a UE. It is also understood that receive path 500 may be implemented in a first UE, and transmit path 400 may be implemented in a second UE to support SL communication. In some embodiments, receive path 500 is configured to support sidelink measurements in V2X communication, as described in embodiments of this disclosure.

[0072] like Figure 4 The transmission path 400 shown includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, an N-size inverse fast Fourier transform (IFFT) block 415, a parallel-to-serial (P-to-S) block 420, a cyclic prefix addition block 425, and an up-converter (UC) 430. For example... Figure 5 The receiver path 500 shown includes a downconverter (DC) 555, a cyclic prefix removal block 560, a serial-to-parallel (S-to-P) block 565, a fast Fourier transform (FFT) block of size N, a parallel-to-serial (P-to-S) block 575, and a channel decoding and demodulation block 580.

[0073] As shown in Figure 400, the channel coding and modulation block 405 receives a set of information bits, applies coding (such as low-density parity-check (LDPC) coding), and modulates the input bits (such as using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a frequency domain modulation symbol sequence.

[0074] Serial-to-parallel block 410 converts (e.g., demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in gNB 102 and UE 116. IFFT block 415 of size N performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. Parallel-to-serial block 420 converts (e.g., multiplexes) the parallel time-domain output symbols from IFFT block 415 of size N to generate a serial time-domain signal. Cyclic prefix addition block 425 inserts a cyclic prefix into the time-domain signal. Upconverter 430 modulates (e.g., upconverts) the output of cyclic prefix addition block 425 to an RF frequency for transmission via a wireless channel. The signal may also be filtered in baseband before conversion to the RF frequency.

[0075] The transmitted RF signal from gNB 102 reaches UE 116 after passing through the wireless channel, and the operation opposite to that at gNB 102 is performed at UE 116.

[0076] like Figure 5 As shown, downconverter 555 downconverts the received signal to the baseband frequency, and cyclic prefix removal block 560 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 565 converts the time-domain baseband signal into a parallel time-domain signal. FFT block 570 of size N performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 575 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 580 demodulates and decodes the modulated symbols to recover the original input data stream.

[0077] Each of gNB 101-103 can be implemented as follows Figure 4 The transmission path 400 shown is similar to transmitting to UEs 111-116 in the downlink, and can be implemented as follows: Figure 5 The receive path 500 shown is similar to receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmit path 400 for transmitting to gNBs 101-103 in the uplink and / or to another UE in the sidelink, and may implement a receive path 500 for receiving from gNBs 101-103 in the downlink and / or from another UE in the sidelink.

[0078] Figure 4 and Figure 5 Each component can be implemented using only hardware or a combination of hardware and software / firmware. As a specific example, Figure 4 and Figure 5 At least some components can be implemented in software, while others can be implemented in configurable hardware or a hybrid of software and configurable hardware. For example, FFT block 570 and IFFT block 515 can be implemented as configurable software algorithms, where the value of size N can be modified depending on the implementation method.

[0079] Furthermore, although described as using FFT and IFFT, this is for illustrative purposes only and should not be construed as limiting the scope of this disclosure. Other types of transforms, such as the Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions, can be used. It will be understood that for the DFT and IDFT functions, the value of variable N can be any integer (such as 1, 2, 3, 4, etc.), while for the FFT and IFFT functions, the value of variable N can be any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0080] although Figure 4 and Figure 5 An example of a wireless transmit and receive path is shown, but it is possible to modify it further. Figure 4 and Figure 5 Make various changes. For example, Figure 4 and Figure 5 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. Furthermore, Figure 4 and Figure 5 This section aims to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0081] In the 3GPP wireless standards, NR has been discussed as a 5G wireless communication technology. One of the features of NR under discussion is V2X.

[0082] Figure 6 An example V2X communication over a side link 600 according to an embodiment of this disclosure is shown. Figure 6 The example of V2X communication on the side link 600 shown is for illustrative purposes only.

[0083] In the 3GPP wireless communication system standards, New Radio Access Technology (NR) has been designated as 5G wireless communication. One of the characteristics of NR is SL communication, which enables UE-to-UE direct communication without network involvement. A typical example service using SL communication is Vehicle-to-Everything (V2X).

[0084] Figure 6 An example of a vehicle-to-vehicle communication scenario is shown. Two or more vehicles can send and receive data / control signals via a direct link / interface between the vehicles. The direct link / interface between UEs is designated SL or PC5 interface in 3GPP, therefore "SL communication" is often used in conjunction with "V2X communication." Note that... Figure 6 The description covers a scenario where vehicles can still communicate with the gNB to obtain SL resources, SL radio bearer configurations, etc.; however, even without interaction with the gNB, vehicles can still communicate with each other via SL. In this case, SL resources, SL radio bearer configurations, etc., are pre-configured (e.g., via a V2X server or any other core network entity).

[0085] In 3GPP Rel-16, basic SL communication functions are supported. For Rel-17, more enhanced features are planned to be introduced into SL. One of the Rel-17 features is support for Layer 2 (L2) SL-based UE-to-network relay operations. Note that UE-to-network relay is also referred to here as UE2NW relay. In an L2-SL-based UE2NW relay, the UE receives packets destined for the SL remote UE from the gNB in ​​the DL (corresponding to RX (receive) in the DL diagram) and relays them to the SL remote UE in the SL (corresponding to TX (transmit) in the SL diagram). Furthermore, the L2-SL-based UE2NW relay UE receives packets destined for the gNB from the SL remote UE in the SL (corresponding to RX in the SL) and relays them to the gNB in ​​the UL (corresponding to TX in the UL diagram). Using the L2-SL-based UE2NW relay UE, the SL remote UE can communicate well with the gNB even when the direct radio conditions between the SL remote UE and the gNB are poor. Note that the SL remote UE can also be located outside the cell's coverage area.

[0086] Figure 7 An example of an L2-based SL UE-to-network relay scenario 700 according to an embodiment of the present disclosure is shown. Figure 7 The embodiment of L2-based SL UE to network relay scenario 700 shown is for illustrative purposes only.

[0087] For L2 UE to network relay, the adaptation layer is placed on the Radio Link Control (RLC) sublayer of both CP and UP at the Uu interface between the relay UE and gNB. Uu Service Data Adaptation Protocol / Packet Data Convergence Protocol (SDAP / PDCP) and Radio Resource Control (RRC) terminate between the remote UE and gNB, while RLC, MAC, and PHY terminate on each link (i.e., the link between the remote UE and the UE to the network relay UE, and the link between the UE to the network relay UE and gNB). In the 3GPP standardization, whether to also support the adaptation layer at the PC5 interface between the remote UE and the relay UE is left to the work item phase (assuming a downward selection is performed first before delving into the detailed PC5 adaptation layer functionality).

[0088] Figure 8A An example L2-based SL UE-to-network relay user plane protocol architecture 800 is shown according to an embodiment of the present disclosure. Figure 8A The embodiment of the L2-based SL UE-to-network relay user plane protocol architecture 800 shown is for illustrative purposes only.

[0089] Figure 8B An example L2-based SL UE-to-network relay control plane protocol architecture 850 is shown according to an embodiment of the present disclosure. Figure 8BThe embodiment of the L2-based SL UE-to-network relay control plane protocol architecture 850 shown is for illustrative purposes only.

[0090] Figure 8A and Figure 8B An example of the L2-based SL-based UE2NW trunk user plane and control plane protocol architecture is shown. Note that this description is based on the assumption that an adaptation layer is also supported at the PC5 interface. Figure 8A and Figure 8B However, the adapter layer at the PC5 interface may not exist and depends on the 3GPP standardization process.

[0091] For L2 UE to network relay, in the uplink: (1) the Uu adaptation layer at the relay UE supports UL bearer mapping between the ingress PC5 RLC channel used for relay and the egress Uu RLC channel on the relay UE Uu path. For uplink relay services, different end-to-end RBs (SRB, DRB) of the same remote UE and / or different remote UEs can undergo N:1 mapping and data multiplexing on a single Uu RLC channel; and (2) the Uu adaptation layer is used to support the remote UE identifier for UL services (multiplexing data from multiple remote UEs). The remote UE Uu radio bearer and the remote UE's identity information are included in the Uu adaptation layer at the UL so that the gNB correlates the received data packets of the specific PDCP entity associated with the correct remote UE Uu radio bearer of the remote UE.

[0092] For L2 UE to network relay, for the downlink: (1) The Uu adaptation layer can be used to support DL bearer mapping at the gNB to map the end-to-end radio bearers (SRB, DRB) of the remote UE to the Uu RLC channel on the relay UE Uu path. The Uu adaptation layer can be used to support DL N:1 bearer mapping and data multiplexing between the remote UE and / or multiple end-to-end radio bearers (SRB, DRB) of different remote UEs and a Uu RLC channel on the relay UE Uu path; (2) The Uu adaptation layer needs to support the remote UE identifier for downlink services. The identity information of the remote UE Uu radio bearer and the identity information of the remote UE need to be put into the Uu adaptation layer by the gNB at the DL so that the relay UE can map the data packets received from the remote UE Uu radio bearer to its associated PC5RLC channel.

[0093] For paging operations, the L2-based SL UE2NW relay UE listens for the PF and PO of the SL remote UE, in addition to its own paging frame (PF) and paging opportunity (PO). This is similar to Option 2 for FeD2D paging in the 3GPP standard specification. Note that the formulas for PF and PO are specified in the 3GPP standard specification. If the L2-based SL UE2NW relay UE receives a paging message during the paging opportunity of the SL remote UE, the L2-based SL UE2NW relay UE relays the paging message to the SL remote UE. Note that the PF is a frame containing the PO, and the PO is the time slot in the frame where the paging signal is transmitted.

[0094] L2-based SL UE2NW relay UEs can receive short messages in their own PO or in the PO of an SL remote UE. Short messages are sent on the PDCCH using a Paging-Radio Network Temporary Identifier (P-RNTI), with or without an associated paging message using the short message field in Downlink Control Information (DCI) format 1_0. Table 1 shows the short messages. In Table 1, bit 1 is the most significant bit.

[0095] Table 1. Short Messages

[0096]

[0097] Because short messages are sent on the PDCCH, and the PDCCH and the Physical Side Link Control Channel (PSCCH), which is the physical control channel in the SL, have very different formats and are not compatible, the L2-based SL UE2NW relay UE cannot forward the received short messages to the SL remote UE as is in the SL.

[0098] Figure 9 The signaling flow for SL-based UE-to-network relay operation 900 according to an embodiment of the present disclosure is illustrated. For example, the SL-based UE-to-network relay operation 900 can be performed by a UE (e.g., such as...) Figure 1 As shown in 111-116) and BS (e.g., as Figure 1 Execute as shown in 101-103). Figure 9 The embodiment of SL-based UE-to-network relay operation 900 shown is for illustrative purposes only. Figure 9 One or more components shown may be implemented in a dedicated circuit configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function.

[0099] Figure 9An example of an embodiment is shown. The SL-based UE-to-network relay operation 900 is performed by the SL remote UE (901), the L2 SL-based UE2NW relay UE (903), and the serving gNB (905). Once the SL remote UE and the L2 SL-based UE2NW relay UE have established an SL-RRC (or PC5-RRC) connection, in step 911, the SL remote UE notifies the L2 SL-based UE2NW relay UE of auxiliary information via an SL-RRC (e.g., PC5-RRC) message. This auxiliary information includes information on the list of System Information Blocks (SIBs) of interest and information for the L2 SL-based UE2NW relay UE to calculate the PO of the SL remote UE.

[0100] The auxiliary information for the PO used for SL remote UEs includes the UE's Discontinuous Reception (DRX) cycle, UE ID, and index i_s. The UE's DRX cycle is determined by the shortest DRX value among UE-specific DRX values ​​(if the DRX cycle is configured by RRC and / or upper layers) and a default DRX value broadcast in the system information. In RRC idle state, if the upper layer has not configured a UE-specific DRX, the default value is applied. The UE ID is determined by {5G-S-TMSI mod 1024}, and the index i_s is determined by {floor(UE id / N) mod Ns}, where N is the total number of paging frames in the UE's DRX cycle, and Ns is the number of paging opportunities for the PF.

[0101] The L2-based SL UE2NW relay UE calculates the PF and PO of the SL remote UE using the auxiliary information received in step 911 and the specified formula. Then, in step 921, the L2-based SL UE2NW relay UE listens for its own PF and PO as well as the PF and PO of the SL remote UE to receive short messages and paging messages. If, in step 931, the L2-based SL UE2NW relay UE receives a short message in its own PF and PO or in the PF and PO of the SL remote UE, then in step 941, the L2-based SL UE2NW relay UE performs the following action.

[0102] In one example of Case 1, if the short message indicates systemInfoModification (if the most significant bit is set to 1), the L2-SL-based UE2NW relay UE acquires (updated / modified) the system information block, and if it is included in the list of SIBs of interest to the SL remote UE and / or has been updated / modified, relays the acquired (updated / modified) system information block to the SL remote UE via SL. Otherwise, no specific action is required from the L2-SL-based UE2NW relay UE.

[0103] In one example of Case 2, if the short message indicates etwsAndCmasIndication (if the second most significant bit is set to 1), the L2-SL-based UE2NW relay UE receives Earthquake and Tsunami Warning System (ETWS) / Commercial Mobile Alert Service (CMAS) notifications, and if the corresponding SIB (e.g., SIB 6 / SIB7 for ETWS, SIB8 for CMAS) is included in the list of SIBs of interest to the SL remote UE, the ETWS / CMAS notification is relayed to the remote UE via SL. Note that an alternative is that the L2-SL-based UE2NW relay UE can relay ETWS / CMAS notifications to the remote UE via SL, regardless of the remote UE's interest.

[0104] In one example of case 3, if the short message indicates stopPagingMonitoring (if the third most significant bit is set to 1), the L2-based SL UE2NW relay UE stops listening for the PDCCH timing used for paging in that PO.

[0105] Note that an alternative is that the SL-RRC (PC5-RRC) message in step 911 may not include the list of SIBs of interest to the SL remote UE, and in this case, the L2-based SL UE2NW relay UE always relays the acquired (updated / changed) system information block to the SL remote UE via SL, regardless of which SIB has been updated / changed in case 1) and the ETWS / CMAS notification in case 2).

[0106] Figure 10 Another signaling flow for SL-based UE-to-network relay operation 1000 according to an embodiment of this disclosure is shown. For example, SL-based UE-to-network relay operation 1000 can be performed by a UE (e.g., such as...) Figure 1 As shown in 111-116) and BS (e.g., as Figure 1 Execute as shown in 101-103). Figure 10 The illustrated embodiment of SL-based UE-to-network relay operation 1000 is for illustrative purposes only. Figure 10 One or more components shown may be implemented in a dedicated circuit configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function.

[0107] Figure 10 Another example of the embodiment is shown. For example... Figure 10As shown, the SL remote UE (1001), the L2-SL based UE2NW relay UE (1003), and the serving gNB (1005) perform operations. Once the SL remote UE and the L2-SL based UE2NW relay UE have established an SL-RRC (or PC5-RRC) connection, in step 1011, the SL remote UE notifies the L2-SL based UE2NW relay UE of auxiliary information for calculating the PO (Paging Opportunity) of the SL remote UE via an SL-RRC (PC5-RRC) message. The auxiliary information for the PO of the SL remote UE includes the UE's DRX period, UE ID, and index i_s. The UE's DRX period is determined by the shortest DRX value among the UE-specific DRX values ​​(if configured by RRC and / or upper layers) and the default DRX value broadcast in the system information.

[0108] In RRC idle state, if the UE-specific DRX is not configured by the upper layer, the default value is applied. The UE ID is determined by {5G-S-TMSI mod 1024}, and the index i_s is determined by {floor(UE id / N) mod Ns}, where N is the total number of paging frames in the UE's DRX cycle, and Ns is the number of paging opportunities for the PF.

[0109] The L2-SL-based UE2NW relay UE calculates the PF and PO of the SL remote UE using the auxiliary information received in step 1011 and the formula specified in the 3GPP standard specification. Then, in step 1021, the L2-SL-based UE2NW relay UE listens for its own PF and PO as well as the PF and PO of the SL remote UE. If, in step 1031, the L2-SL-based UE2NW relay UE receives a short message in its own PF and PO or in the PF and PO of the SL remote UE, then in steps 1041 and 1051, the L2-SL-based UE2NW relay UE can use the following alternative to notify the SL remote UE of the information in the received short message.

[0110] In one embodiment of Alternative 1, the L2-based SL-based UE2NW relay UE includes received information (systemInfoModification and / or etwsAndCmasIndication and / or stopPagingMonitoring) in the PSCCH and transmits the PSCCH to the SL remote UE via the SL. This information can be included in the Rel-16 PSCCH using unused / reserved code points (e.g., if unused / reserved code points exist in the Rel-16 PSCCH, the first unused / reserved code point indicates systemInfoModification, the second unused / reserved code point indicates etwsAndCmasIndication, and so on) or as newly defined physical control information in the Rel-17 PSCCH.

[0111] In one embodiment of Alternative 2, the L2-based SL-based UE2NW relay UE generates a new SL MAC CE including the received information (systemInfoModification and / or etwsAndCmasIndication and / or stopPagingMonitoring) and transmits it to the SL remote UE via SL.

[0112] In one embodiment of Alternative 3, the L2-based SL-based UE2NW relay UE includes received information (systemInfoModification and / or etwsAndCmasIndication and / or stopPagingMonitoring) in the SL-RRC (PC5-RRC) message and transmits the SL-RRC (PC5-RRC) message to the SL remote UE via SL.

[0113] The methods described in the embodiments according to the claims or specific implementations of this disclosure can be implemented in hardware, software, or a combination of hardware and software.

[0114] When electrical structures and methods are implemented in software, a computer-readable recording medium on which one or more programs (software modules) are recorded can be provided. The one or more programs recorded on the computer-readable recording medium are configured to be executable by one or more processors in an electronic device. The one or more programs include instructions for performing the methods of embodiments described in the specific embodiments of this disclosure.

[0115] Programs (e.g., software modules or software) can be stored in random access memory (RAM), non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), disk storage devices, optical disc-ROM (CD-ROM), digital versatile optical disc (DVD), another type of optical storage device, or magnetic tape cassette. Alternatively, programs can be stored in a memory system that includes some or all of the above-described memory devices. Furthermore, multiple memory devices may be included.

[0116] The program can also be stored in an attachable storage device accessible via a communication network such as the Internet, intranet, local area network (LAN), wireless LAN (WLAN), or storage area network (SAN), or a combination thereof. According to embodiments of this disclosure, the storage device can be connected to the device via an external port. Another storage device on the communication network can also be connected to the device executing embodiments of this disclosure.

[0117] In the foregoing embodiments of this disclosure, the elements included in this disclosure are represented in singular or plural form according to the embodiments. However, for ease of explanation, singular or plural forms are suitably chosen, and this disclosure is not limited thereto. Thus, elements expressed in plural form may also be configured as a single element, and elements expressed in singular form may also be configured as multiple elements.

[0118] The signaling flowcharts described above illustrate example methods that can be implemented according to the principles of this disclosure, and various modifications can be made to the methods shown in the signaling flowcharts herein. For example, although shown as a series of steps, the various steps in each diagram can overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps can be omitted or replaced by other steps.

[0119] Although this disclosure has been described with reference to exemplary embodiments, various changes and modifications will occur to those skilled in the art. This disclosure is intended to cover such changes and modifications that fall within the scope of the appended claims. None of the descriptions in this application should be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined by the claims.

Claims

1. A method performed by a first user equipment (UE) in a wireless communication system, the method comprising: Receive a message from the second UE via a sidelink channel, which includes a list of system information blocks (SIBs) requested by the second UE. Short messages are received from the base station via the Physical Downlink Control Channel (PDCCH); Based on the short message and the list of SIBs requested in the message, one or more SIBs from the at least one requested SIBs are obtained from the base station, the one or more SIBs including at least one first SIB related to the Earthquake and Tsunami Warning System / Commercial Mobile Alert Service (CMAS) and / or at least one second SIB related to the ETWS / CMAS in addition to the at least one first SIB; as well as The one or more SIBs are transmitted to the second UE via the side link channel.

2. The method according to claim 1, wherein, At least one first SIB associated with the ETWS / CMAS includes at least one ETWS notification and / or at least one CMAS notification.

3. The method according to claim 2, wherein, At least one first SIB associated with the ETWS / CMAS includes SIB6 and / or SIB7 for the ETWS notification and SIB8 for the CMAS notification.

4. The method according to claim 1, wherein, When the short message includes an indication of an ETWS / CMAS notification, at least one first SIB is acquired, and When the short message includes an instruction to modify system information other than SIB6, SIB7, and SIB8, at least one second SIB is obtained.

5. The method according to claim 1, wherein, The first UE is a UE-to-network relay UE, and the second UE is a UE-to-network remote UE.

6. A first user equipment (UE) in a wireless communication system, the first UE comprising: transceiver; as well as A controller, coupled to the transceiver, is configured to: Receive a message from the second UE via a sidelink channel containing a list of system information blocks (SIBs) requested by the second UE. Short messages are received from the base station via the Physical Downlink Control Channel (PDCCH). Based on the short message and the list of at least one requested SIBs in the message, one or more SIBs from the at least one requested SIBs are obtained from the base station, the one or more SIBs including at least one first SIB related to the Earthquake and Tsunami Warning System / Commercial Mobile Alert Service (CMAS) and / or at least one second SIB related to the ETWS / CMAS in addition to the at least one first SIB, and The one or more SIBs are transmitted to the second UE via the side link channel.

7. The first UE according to claim 6, wherein, At least one first SIB associated with the ETWS / CMAS includes at least one ETWS notification and / or at least one CMAS notification.

8. The first UE according to claim 7, wherein, At least one first SIB associated with the ETWS / CMAS includes SIB6 and / or SIB7 for the ETWS notification and SIB8 for the CMAS notification.

9. The first UE according to claim 6, wherein, When the short message includes an indication of an ETWS / CMAS notification, at least one first SIB is acquired, and When the short message includes an instruction to modify system information other than SIB6, SIB7, and SIB8, at least one second SIB is obtained.

10. The first UE according to claim 6, wherein, The first UE is a UE-to-network relay UE, and the second UE is a UE-to-network remote UE.

11. A wireless communication system, comprising: First UE; as well as Second UE, The first UE is configured as follows: Receive a message from the second UE via a sidelink channel, including a list of at least one System Information Blocks (SIBs) requested by the second UE. Short messages are received from the base station via the Physical Downlink Control Channel (PDCCH). Based on the short message and the list of at least one requested SIBs in the message, one or more SIBs from the at least one requested SIBs are obtained from the base station, and The one or more SIBs are transmitted to the second UE via the sidelink channel, wherein the second UE is configured to: A message containing a list of SIBs requested by at least one of the second UEs is sent to the first UE via the side link channel, and Receive one or more SIBs from the first UE via the side link channel, of the at least one requested SIB. The one or more SIBs include at least one first SIB associated with the Earthquake and Tsunami Warning System (ETWS) / Commercial Mobile Alert Service (CMAS) and / or at least one second SIB associated with the ETWS / CMAS in addition to the at least one first SIB.

12. The system according to claim 11, wherein, At least one first SIB associated with the ETWS / CMAS includes at least one ETWS notification and / or at least one CMAS notification.

13. The system according to claim 12, wherein, At least one first SIB associated with the ETWS / CMAS includes SIB6 and / or SIB7 for the ETWS notification and SIB8 for the CMAS notification.

14. The system according to claim 11, wherein, When the short message includes an indication of an ETWS / CMAS notification, at least one first SIB is acquired, and When the short message includes an instruction to modify system information other than SIB6, SIB7, and SIB8, at least one second SIB is obtained.

15. The system according to claim 11, wherein, The first UE is a UE-to-network relay UE, and the second UE is a UE-to-network remote UE.

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