Apparatus and method for configuring radio link control layer parameters for direct communication in a wireless communication system

Abstract

The present disclosure relates to a communication method and system for integrating a fifth-generation (5G) communication system that supports higher data rates beyond the fourth-generation (4G) system with Internet of Things (IoT) technology. The present disclosure can be applied to intelligent services based on 5G communication technology and IoT-related technologies, such as smart home, smart building, smart city, smart car, connected car, healthcare, digital education, smart retail, security and safety services. A method for operating a user equipment UE in a wireless communication system is disclosed, which includes: determining a data transmission rate requirement for a vehicle-to-everything (V2X) application and obtaining data rate information according to the required data transmission rate; transmitting the data rate information to a base station and obtaining side-link radio link control (RLC) function configuration parameters; and transmitting the obtained side-link RLC function configuration parameters to other UEs.

Description

Technical Field

[0001] The present disclosure generally relates to a wireless communication system, and more particularly, to an apparatus and method for supporting configuration of side link radio link control (RLC) layer parameters required for data transmission by a direct communication bearer in a wireless communication system. Background Art

[0002] In order to meet the ever-increasing demand for wireless data traffic since the deployment of the fourth-generation (4G) communication systems, efforts have been made to develop improved fifth-generation (5G) or pre-5G communication systems, which are also referred to as "beyond 4G networks" or post-long term evolution (LTE) systems.

[0003] The 5G communication system is considered to be implemented in a millimeter wave (mmWave) band of a relatively high frequency (e.g., 60 GHz band) to achieve a higher data rate. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and large antenna technologies are discussed in the 5G communication system.

[0004] In addition, the development of system network improvements in the 5G communication system is being carried out based on, for example, advanced small cells, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, and coordinated multi-point (CoMP), and receiver-side interference cancellation.

[0005] In the 5G system, hybrid frequency shift keying (FSK), quadrature amplitude modulation (QAM), and sliding window superimposed coding (SWSC) as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies have also been developed.

[0006] Compared with conventional 4G systems, the 5G system is considering supporting more different services. For example, the most representative services may include ultra-wideband mobile communication services (enhanced mobile broadband (eMBB)), ultra-high reliable / low latency communication services (ultra-reliable and low latency communication (URLLC)), large-scale device-to-device communication services (massive machine type communication (mMTC)), and next-generation broadcast services (evolved multimedia broadcast / multicast service (eMBMS)). A system providing URLLC services may be referred to as a URLLC system, and a system providing eMBB services may be referred to as an eMBB system. The terms "service" and "system" may be used interchangeably.

[0007] Among these services, in contrast to existing 4G systems, the URLLC service, which is a new service considered in 5G systems, requires ultra-high reliability (such as a packet error rate of about 10%) and low latency (such as about 0.5 milliseconds (msec)) compared to other services. To meet these stringent conditions, the URLLC service may need to apply a shorter transmission time interval (TTI) than the eMBB service, and various operation schemes for this service are currently being considered.

[0008] The Internet is now evolving into the Internet of Things (IoT), where distributed entities (such as items) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which is a combination of IoT technology and big data processing technology through connection to cloud servers. Since IoT implementation requires technical components such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology", sensor networks, machine-to-machine (M2M) communication, and machine type communication (MTC) have been recently studied.

[0009] Such IoT environments can provide intelligent Internet technology services, which create new value for human life by collecting and analyzing data generated between interconnected things. IoT can be applied to multiple fields including smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart appliances, and advanced medical services through the integration and combination of existing information technology and various industrial applications. Summary of the Invention

[0010] Technical Problem

[0011] Accordingly, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be implemented through beamforming, MIMO, and array antennas. Cloud RAN, as an application of the above big data processing technology, can also be considered an example of the integration of 5G and IoT.

[0012] In 5G systems, wireless interface schemes for providing services that meet various quality of service (QoS) levels are being studied. For example, a direct communication scheme for vehicle-to-everything (V2X) user equipment (UE) has been proposed. V2X refers to all types of communication schemes that can be applied to road vehicles, and through the integration with recently developed wireless communication technologies, various additional services have become possible in addition to the initial safety applications. However, in this field, there is a need to further reduce communication time, increase reliability, and more effectively support direct communication between UEs.

[0013] Problem Solution

[0014] According to one aspect of the present disclosure, a method performed by a first user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station (BS), a first message including radio link control (RLC) function configuration parameter information; and performing sidelink communication with a second UE based on the received RLC function configuration parameter information.

[0015] In one embodiment, the above method further comprises transmitting, to the BS, a SidelinkUEInformation message including data rate information for sidelink transmission when the first UE is in the RRC_Connected state, wherein the first message is a radio resource control (RRC) message, and wherein the RLC function configuration parameter information is configured based on the data rate information included in the SidelinkUEInformation message.

[0016] In one embodiment, when the first UE is in the RRC_Inactive state or the RRC_Idle state, the first message is a system information block (SIB) message.

[0017] In one embodiment, when the first UE is in an out-of-coverage state, the RLC function configuration parameter information is pre-configured.

[0018] In one embodiment, performing the sidelink communication comprises: determining whether a condition for configuring a new sidelink radio bearer (SLRB) is met; transmitting a second RRC message to the second UE when the condition is met; receiving, from the second UE, a third RRC message in response to the second RRC message; and performing sidelink communication with the second UE.

[0019] According to another aspect of the present disclosure, a method performed by a base station (BS) in a wireless communication system, the method comprising transmitting, to a first user equipment (UE), a first message including radio link control (RLC) function configuration parameter information, wherein sidelink communication between the first UE and a second UE is performed based on the transmitted RLC function configuration parameter information.

[0020] According to another aspect of the present disclosure, a method performed by a second user equipment (UE) in a wireless communication system, the method comprising: receiving, from the first UE, a second radio resource control (RRC) message; transmitting, in response to the second RRC message, a third RRC message to the first UE; and performing sidelink communication with the first UE, wherein the second RRC message is received when a condition for configuring a new sidelink radio bearer (SLRB) is met.

[0021] According to another aspect of the present disclosure, a first user equipment (UE) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to receive a first message including radio link control (RLC) function configuration parameter information from a base station (BS), and perform sidelink communication with a second UE based on the received RLC function configuration parameter information.

[0022] According to another aspect of the present disclosure, a base station (BS) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to transmit a first message including radio link control (RLC) function configuration parameter information to a first user equipment (UE), and perform sidelink communication between the first UE and a second UE based on the transmitted RLC function configuration parameter information.

[0023] According to another aspect of the present disclosure, a second user equipment (UE) includes: a transceiver configured to transmit and receive at least one signal; and a controller connected to the transceiver, wherein the controller is configured to receive a second radio resource control (RRC) message from the first UE, transmit a third RRC message to the first UE in response to the second RRC message, and perform sidelink communication with the first UE, and receive the second RRC message when conditions for configuring a new sidelink radio bearer (SLRB) are met.

[0024] Advantageous Effects of the Invention

[0025] Aspects of the present disclosure are intended to solve at least the above problems and / or disadvantages, and provide at least the following advantages.

[0026] Accordingly, one aspect of the present disclosure provides an apparatus and method for supporting vehicle communication services and data transmission, which achieve required high reliability and low latency values by providing a method for performing communication between UEs in a vehicle communication system through a direct communication scheme.

[0027] Another aspect of the present disclosure provides a method for supporting vehicle communication services requiring various quality of service (QoS) levels through direct communication between UEs, and a method for configuring RLC function parameters for direct communication between UEs in a vehicle communication system, thereby achieving required high speed, high reliability, and low latency values. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] From the following description taken in conjunction with the drawings, the above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent, in which:

[0029] Figure 1Shows a wireless communication system according to an embodiment;

[0030] Figure 2 Shows the configuration of a BS in a wireless communication system according to an embodiment;

[0031] Figure 3 Shows the configuration of a UE in a wireless communication system according to an embodiment;

[0032] Figure 4A Shows the configuration of a communication unit in a wireless communication system according to an embodiment;

[0033] Figure 4B Shows an example according to an embodiment, in which the analog beamforming unit of the communication unit uses an independent antenna array for each transmission path in the wireless communication system;

[0034] Figure 4C Shows an example according to an embodiment, in which the analog beamforming unit of the communication unit shares an antenna array for the transmission paths in the wireless communication system;

[0035] Figure 5A Shows the direct communication between UEs via sidelink radio access technology (RAT) according to the first embodiment; Figure 5B Shows the direct communication between UEs via sidelink RAT according to the second embodiment;

[0036] Figure 5C Shows the direct communication between UEs via sidelink RAT according to the third embodiment;

[0037] Figure 5D Shows the direct communication between UEs via sidelink RAT according to the fourth embodiment;

[0038] Figure 6A Shows a method according to an embodiment, by which the BS configures the RLC function configuration parameters required for configuring the PC5 RRC connection between UEs;

[0039] Figure 6B Shows a method according to an embodiment, by which the UE configures the RLC function configuration parameters required for configuring the PC5 RRC connection;

[0040] Figure 7 Shows a signal process according to an embodiment for operating the RLC function configuration parameters to be applied to sidelink data;

[0041] Figure 8A Shows a method for a UE to measure and report sidelink resource congestion according to an embodiment;

[0042] Figure 8B illustrates a method for a UE to measure and report sidelink resource congestion according to an embodiment;

[0043] Figure 9 illustrates a signaling procedure for configuring a sidelink resource allocation mode according to an embodiment;

[0044] Figure 10A illustrates a signaling flow for configuring a new PC5 RRC unicast connection between UEs according to an embodiment;

[0045] Figure 10B illustrates a signaling flow for transmitting and receiving V2X packets through preconfigured PC5 RRC unicast connection information according to an embodiment;

[0046] Figure 10C illustrates a signaling flow for configuring a new PC5 unicast-based SLRB according to an embodiment;

[0047] Figure 11A illustrates a method for a UE to handle source identifier update of a sidelink according to an embodiment;

[0048] Figure 11B illustrates a method for a UE to handle source identifier update of a sidelink according to an embodiment; and

[0049] Figure 12 illustrates a signaling procedure for handling source identifier update of a sidelink according to an embodiment. Detailed Description

[0050] Hereinafter, embodiments of the present disclosure may be described with reference to the accompanying drawings. Accordingly, those of ordinary skill in the art will recognize that various modifications, equivalent representations, and / or alternative representations can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Regarding the description of the drawings, similar components may be labeled with similar reference numerals. For the sake of clarity and conciseness, descriptions of well-known functions and / or configurations will be omitted.

[0051] The terms used in this disclosure are only for describing specific embodiments and are not intended to limit this disclosure. Singular expressions may include plural expressions unless they are different in context. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. These terms defined in commonly used dictionaries may be interpreted as having the same meaning as their context in the relevant technical field, and unless explicitly defined in this disclosure, they cannot be interpreted as having an ideal or overly formal meaning. In some cases, even the terms defined in this disclosure should not be interpreted as excluding embodiments of this disclosure.

[0052] In the following, embodiments will be described based on hardware. However, embodiments include techniques using both hardware and software and can therefore also include software.

[0053] This disclosure relates to an apparatus and method for configuring RLC function parameters through a direct communication protocol between UEs in a wireless communication system to support V2X services. Specifically, this disclosure describes a technique for meeting the QoS levels required for various V2X services based on a method of a UE for configuring RLC parameters required to support high-speed data transmission and high reliability, which is required for sidelink direct communication between V2X UEs in a wireless communication system.

[0054] The terms related to signals, terms related to channels, terms related to control information, terms related to network entities, and terms related to device elements used in the following description are only for convenience of description. Therefore, this disclosure is not limited to such terms, and other terms with the same technical meaning can be used.

[0055] This disclosure uses terms from communication standards (such as the Third Generation Partnership Project (3GPP)) to describe embodiments, but only as examples. Embodiments herein can be modified and applied to other communication systems.

[0056] A method of operating a UE in a wireless communication system may include: determining data rate information required for a V2X application; notifying a BS of the required data rate information; obtaining RLC function configuration parameters corresponding to the data rate information from the BS; notifying other UEs of the obtained RLC function configuration parameters; and performing data transmission and reception based on direct communication based on the obtained RLC function configuration parameters.

[0057] A UE device in a wireless communication system may include a transceiver and at least one processor functionally connected to the transceiver. The at least one processor may determine data rate information for a V2X application through which the UE transmits and receives data in direct communication mode, the at least one processor may notify the BS of the required data rate information, and receive RLC function configuration parameters corresponding to the required data rate information from the BS. When the UE obtains the RLC function configuration parameters corresponding to the data rate information, the at least one processor may notify other UEs of the RLC function configuration parameters.

[0058] Figure 1 FIG. shows a wireless communication system according to one embodiment.

[0059] Figure 1 FIG. shows BS 110, UE#1 120, and UE#2 130 as some of the nodes using a radio channel in a wireless communication system. Although Figure 1 only one BS is shown, other BSs identical or similar to BS 110 may be further included. Although Figure 1 only two UEs are shown, other UEs identical or similar to UE#1 120 and UE#2 130 may be further included.

[0060] BS 110 is a network infrastructure element that provides radio access to UEs 120 and 130. BS 110 has a coverage area defined in a predetermined geographical region based on the range within which signals can be transmitted and received. BS 110 may be referred to as an "access point (AP)", "eNodeB (eNB)", "fifth generation (5G) node", "5G nodeB (NB)", "radio point", or "transmit / receive point (TRP)", or other terms with an equivalent technical meaning.

[0061] Each of UE#1 120 and UE#2 130 is used by a user and communicates with BS 110 through a radio channel. Depending on the situation, at least one of UE#1 120 and UE#2 130 may operate without user participation. That is, at least one of UE#1 120 and UE#2 130 performs MTC and may not be carried by a user. Each of UE#1 120 and UE#2 130 may be referred to as a "user equipment", "mobile station", "subscriber station", "remote terminal", "wireless terminal", or "user device", or other terms with the same meaning, as well as a "terminal".

[0062] BS 110, UE#1 120, and UE#2 130 can transmit and receive wireless signals in sub - bands of the 6 gigahertz (GHz) and millimeter - wave frequency bands (e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz). To increase the channel gain, BS 110, UE#1 120, and UE#2 130 can perform beamforming, which can include transmit beamforming and receive beamforming. That is, BS 110, UE#1 120, and UE#2 130 can assign directionality to transmitted or received signals. Therefore, BS 110, UE 120, and UE 130 can select serving beams 112, 113, 121, and 131 through a beam search process or a beam management process. After the serving beams 112, 113, 121, and 131 are selected, communication can be performed through resources that have a quasi - co - location (QCL) relationship with the resources of the transmit serving beams 112, 113, 121, and 131.

[0063] If the large - scale characteristics of the channel used to transmit symbols through a first antenna port can be inferred from the channel used to transmit symbols through a second antenna port, then a QCL relationship can be evaluated between the first antenna port and the second antenna port. For example, the large - scale characteristics can include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial receiver parameters.

[0064] Figure 2 The configuration of a BS in a wireless communication system according to an embodiment is shown.

[0065] Figure 2 The configuration shown can be the configuration of BS 110. The term "…… unit" or a word ending such as "……er" or "……or" can indicate a unit that processes at least one function or operation, and can be implemented by hardware, software, or a combination of hardware and software.

[0066] Reference Figure 2 , the BS includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a controller 240.

[0067] The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. In data transmission, the wireless communication unit 210 can encode and modulate the transmitted bit stream to generate complex symbols. In data reception, the wireless communication unit 210 reconstructs the received bit stream by demodulating and decoding the baseband signal.

[0068] In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal transmitted through the antenna, and down-converts the RF band signal received through the antenna into a baseband signal. Therefore, the wireless communication unit 210 may include, for example, a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), and an analog-to-digital converter (ADC). The wireless communication unit 210 may include a plurality of transmit / receive paths and at least one antenna array including a plurality of antenna elements.

[0069] In terms of hardware, the wireless communication unit 210 may include a digital unit and an analog unit. Depending on the operating power, operating frequency, etc., the analog unit may include a plurality of sub-units. The digital unit may be implemented by at least one processor such as a digital signal processor (DSP).

[0070] The wireless communication unit 210 transmits and receives signals as described above. Therefore, all or part of the wireless communication unit 210 may be referred to as a "transmitter", "receiver", or "transceiver". In the following description, the transmission and reception performed through the wireless channel may include the above processing of the wireless communication unit 210.

[0071] The backhaul communication unit 220 provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit 220 converts the bit stream transmitted from the BS to other access nodes, other BSs, higher nodes, or the core network into a physical signal, and converts the physical signal received from the nodes into a bit stream.

[0072] The storage unit 230 may store data such as basic programs, application programs, and configuration information for the operation of the BS. The storage unit 230 may include at least one of a volatile memory and a non-volatile memory. The storage unit 230 provides the stored data in response to a request from the controller 240.

[0073] The controller 240 may control the overall operation of the BS. For example, the controller 240 transmits and receives signals through the wireless communication unit 210 or the backhaul communication unit 220. The controller 240 records and reads data in the storage unit 230. The controller 240 may execute the functions of the protocol stack required by the communication standard. According to other embodiments, the protocol stack may be included in the wireless communication unit 210. Therefore, the controller 240 may include at least one processor.

[0074] The controller 240 may transmit RRC configuration information to the UEs 120 and 130. The controller 240 may transmit sidelink configuration information to the UEs 120 and 130. For example, the controller 240 may control the BS to perform operations according to the embodiments described below.

[0075] Figure 3 Shows the configuration of a UE in a wireless communication system according to an embodiment.

[0076] Figure 3 The configuration shown may be the configuration of UE#1 120 or UE#2 130. Refer to Figure 3 , the UE includes a communication unit 310, a storage unit 320, and a controller 330.

[0077] The communication unit 310 performs functions for transmitting and receiving signals through a radio channel. For example, the communication unit 310 performs a conversion function between a baseband signal and a bit stream according to the physical layer standard of the system. In data transmission, the communication unit 310 encodes and modulates the transmitted bit stream to generate complex symbols. In data reception, the communication unit 310 reconstructs the received bit stream by demodulating and decoding the baseband signal. The communication unit 310 up-converts the baseband signal to an RF band signal, transmits the RF band signal through an antenna, and then down-converts the RF band signal received through the antenna to a baseband signal. The communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

[0078] The communication unit 310 may include multiple transmit / receive paths. The communication unit 310 may include at least one antenna array, and the antenna array includes multiple antenna elements. In terms of hardware, the communication unit 310 may include digital circuits and analog circuits, such as a radio frequency integrated circuit (RFIC). The digital circuit and the analog circuit may be implemented as a single package. The communication unit 310 may include multiple RF chains and may perform beamforming.

[0079] The communication unit 310 may include different communication modules for processing signals in different frequency bands. The communication unit 310 may include multiple communication modules to support multiple different radio access technologies. For example, different radio access technologies may include Bluetooth TM Low Energy (BLE), Wireless Fidelity (Wi-Fi), Wi-Fi Gigabyte, and cellular networks, such as LTE. Different frequency bands may include super high frequency (SHF) (e.g., 2.5 GHz, 3.5 GHz, and 5 GHz) bands and millimeter wave (e.g., 60 GHz) bands.

[0080] The communication unit 310 transmits and receives signals and may thus be referred to as a "transmitter", "receiver", or "transceiver". The transmission and reception performed through the radio channel may indicate that the communication unit 310 performs the above processing.

[0081] The storage unit 320 stores data such as a basic program, an application program, and configuration information for UE operation. The storage unit 320 may include at least one of a volatile memory and a non-volatile memory. The storage unit 320 provides the stored data in response to a request from the controller 330.

[0082] The controller 330 controls the overall operation of the UE. For example, the controller 330 transmits and receives signals through the communication unit 310. The controller 330 records and reads data in the storage unit 320. The controller 330 may perform functions of a protocol stack required by a communication standard. Accordingly, the controller 330 may include at least one processor or microprocessor, or may be part of a processor. A part of the communication unit 310 or the controller 330 may be referred to as a communication processor (CP).

[0083] The controller 330 may perform the following processes: determining data transmission requirements of V2X applications for performing sidelink direct communication between the UEs 120 and 130 and other UEs, notifying the BS 110 of the required data transmission information, receiving RLC function configuration parameters corresponding to the required data transmission information from the BS, providing RLC function configuration parameter information to other UEs, and processing data to be transmitted to other UEs according to the RLC function configuration parameter information. For example, the controller 330 may control the UE to perform operations according to embodiments described below.

[0084] Figure 4A The configuration of a communication unit in a wireless communication system according to an embodiment is shown.

[0085] Referring to Figure 4A , the wireless communication unit 210 or the communication unit 310 includes an encoding and modulation unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beamforming unit 408.

[0086] The encoding and modulation unit 402 performs channel encoding, and for this, at least one of a low density parity check (LDPC) code, a convolutional code, and a polar code may be used. The encoding and modulation unit 402 generates modulation symbols by performing constellation mapping.

[0087] The digital beamforming unit 404 performs beamforming on digital signals (e.g., modulation symbols). Thus, the digital beamforming unit 404 multiplies the beamforming weights by the modulation symbols. The beamforming weight values can be used to change the magnitude and phase of the signal and can be referred to as a "precoding matrix" or a "precoder". The digital beamforming unit 404 outputs the digitally beamformed modulation symbols through a plurality of transmission paths 406-1 to 406-N. According to the MIMO transmission scheme, the modulation symbols can be multiplexed, or the same modulation symbols can be provided to the plurality of transmission paths 406-1 to 406-N.

[0088] The plurality of transmission paths 406-1 to 406-N convert the digitally beamformed digital signals into analog signals. Thus, each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast Fourier transform (IFFT) calculator, a cyclic prefix (CP) inserter, a DAC, and an upconverter. The CP inserter is used for the orthogonal frequency division multiplexing (OFDM) scheme and can be omitted when other physical layer schemes (e.g., filter bank multicarrier (FBMC) scheme) are applied. That is, the plurality of transmission paths 406-1 to 406-N provide an independent signal processing process for the plurality of streams generated by digital beamforming. However, depending on the implementation, some elements of the plurality of transmission paths 406-1 to 406-N may be used in common.

[0089] The analog beamforming unit 408 performs beamforming on the analog signals. Thus, the digital beamforming unit 404 multiplies the beamforming weights by the analog signals. The beamforming weights are used to change the magnitude and phase of the signal. More specifically, the analog beamforming unit 408 may be configured as shown in Figure 4B or Figure 4C according to the connection structure between the plurality of transmission paths 406-1 to 406-N and the antennas.

[0090] Figure 4B The configuration of a communication unit in a wireless communication system according to an embodiment is shown. Referring to Figure 4B , the signals input to the analog beamforming unit 408 can be transmitted through the antennas via phase / magnitude conversion and amplification operations. The signals in each path are transmitted through different antenna arrays (or sets). When processing the signals input through the first path, the signals are converted into a signal sequence with the same or different phases / magnitudes by the phase / magnitude conversion units 412-1-1 to 412-1-M, amplified by the amplifiers 414-1-1 to 414-1-M, and transmitted through the antennas.

[0091] Figure 4C The configuration of a communication unit in a wireless communication system according to an embodiment is shown.

[0092] Referring toFigure 4C , the signal input to the analog beamforming unit 408 is transmitted through the antenna via phase / magnitude conversion and amplification operations. The signals in each path are transmitted through the same antenna array. When processing the signal input through the first path, the signal is converted by the phase / magnitude conversion units 412-1-1 to 412-1-M into a signal sequence with the same or different phases / magnitudes, and amplified by the amplifiers 414-1-1 to 414-1-M. The amplified signals to be transmitted through one antenna are summed by the summing units 416-1 to 416-M based on the antenna elements, and then transmitted through the antenna.

[0093] Figure 4B Examples are shown where independent antenna arrays are used for each transmission path, and Figure 4C Examples are shown where the transmission paths share one antenna array. However, some transmission paths can use independent antenna arrays while the remaining transmission paths can share one antenna array. In addition, by applying a switchable structure between the transmission paths and the antenna array, a structure that can adaptively change according to the situation can be used.

[0094] V2X services can be divided into basic safety services and advanced services. The basic safety services can correspond to detailed services such as vehicle notification (cooperative awareness message (CAM) or basic safety message (BSM)) services, left turn notification services, forward collision warning services, approaching emergency vehicle notification services, forward obstacle warning services, and intersection signal information services, and can transmit and receive V2X information through broadcast, unicast, or multicast transmission schemes.

[0095] Advanced services have more stringent QoS requirements compared to basic safety services and require a scheme to transmit and receive V2X information through unicast and broadcast transmission schemes instead of just the broadcast transmission scheme in order to transmit and receive V2X information within a specific vehicle group or between two vehicles. Advanced services can correspond to detailed services such as queuing services, autonomous driving services, remote driving services, and extended sensor-based V2X services.

[0096] For V2X services, the UE can perform V2X services through the ng-RAN or E-UTRAN in the ng-RAN (gNB) connected to the 5G core network or the E-UTRAN (ng-eNB) connected to the 5G core network. When the BS (ng-RAN or ng-eNB) is connected to the evolved packet core (EPC) network, the V2X services can be performed through the BS. When the BS is connected to the evolved packet core (EPC) network, the V2X services can be performed through the BS. The V2X radio interface communication scheme that can be used for direct communication between UEs can be at least one of the unicast, multicast, and broadcast schemes, and when performing V2X transmission / reception in each communication scheme, a method for managing and configuring radio communication parameters suitable for the QoS requirements of V2X services should be provided.

[0097] A system for performing direct communication between UEs based on LTE radio communication is defined, such that the transmitting UE selects and operates the parameters required for its transmission. In the case of LTE radio communication, V2X service messages for basic security are transmitted between UEs through the direct communication scheme. The QoS requirements for basic security V2X services are not strict, and even if there are multiple basic security services, the diversity of QoS requirements between services is low, and the differences between services are small. Therefore, even in the mode where the BS schedules radio resources for direct communication between UEs based on LTE radio communication, the BS simply schedules radio resources without the need to obtain detailed QoS requirement information for V2X services, and the UE manages and configures the parameters.

[0098] Advanced V2X services have a variety of QoS requirements, and the QoS levels of each V2X service may vary greatly. A specific advanced V2X service can only be performed when the radio resources and radio parameters for direct communication are configured to meet the strict QoS requirements of the service. Therefore, a system that supports advanced V2X services based on direct communication between UEs should provide a better method for guaranteeing QoS than conventional systems.

[0099] Figure 5A Shows direct communication between UEs through the side-link RAT according to the first embodiment. In Figure 5AAmong them, UEs within the coverage of the gNB perform direct communication. The resource allocation configuration parameter information of the sidelink radio bearer to be used for transmitting and receiving V2X packets based on unicast, broadcast, or multicast between UEs can be transmitted to UEs 120 and 130 through the system information message or RRC dedicated message of gNB 110, or can be pre-configured in UEs 120 and 130. UEs 120 and 130 that perform direct communication through NR V2X SL can transmit the data rate information required for V2X service packets to gNB 110, and obtain the sidelink resource allocation and / or RLC function configuration parameter information from gNB 110. The sidelink RLC function configuration parameter information can be transmitted to other UEs.

[0100] Figure 5B FIG. shows direct communication between UEs via a sidelink RAT according to a second embodiment. In Figure 5B Among them, UEs 120 and 130 within the coverage of the ng-eNB perform direct communication. The resource allocation configuration parameter information of the sidelink radio bearer to be used for transmitting and receiving V2X packets based on unicast, broadcast, or multicast between UEs can be transmitted to UEs 120 and 130 through the system information message or RRC dedicated message of ng-eNB 110, or can be pre-configured in UEs 120 and 130. UEs 120 and 130 that perform direct communication through NR V2X SL can transmit the data rate information required for V2X service packets to ng-eNB 110, and obtain the sidelink resource allocation and / or RLC function configuration parameter information from ng-eNB 110. The sidelink RLC function configuration parameter information can be transmitted to other UEs.

[0101] Figure 5C FIG. shows direct communication between UEs via a sidelink RAT according to a third embodiment. In Figure 5C Among them, UEs 120 within the coverage of the gNB and UEs 130 within the coverage of the gNB perform direct communication. The resource allocation configuration parameter information of the sidelink radio bearer to be used for transmitting and receiving V2X packets based on unicast, broadcast, or multicast between UEs can be transmitted to UEs 120 and 130 through the system information message or RRC dedicated message of gNB 110, or can be pre-configured in UEs 120 and 130. UEs 120 and 130 that perform direct communication through NR V2X SL can transmit the data rate information required for V2X service packets to gNB 110, and obtain the sidelink resource allocation and / or RLC function configuration parameter information from gNB 110. The sidelink RLC function configuration parameter information can be transmitted to other UEs.

[0102] Figure 5D shows the direct communication between UEs via the sidelink RAT according to the fourth embodiment. In Figure 5D , the UEs 120 and 130 within the coverage of the eNB perform direct communication. The resource allocation configuration parameter information of the sidelink radio bearer to be used for transmitting and receiving V2X packets based on unicast, broadcast, or multicast between UEs can be transmitted to the UEs 120 and 130 through the system information message or RRC dedicated message of the eNB 110, or can be pre-configured in the UEs 120 and 130. The UEs 120 and 130 that perform direct communication through NR V2X SL can transmit the data rate information required for V2X service packets to the eNB 110, and obtain the sidelink resource allocation and / or RLC function configuration parameter information from the eNB 110. The sidelink RLC function configuration parameter information can be transmitted to other UEs.

[0103] The sidelink RLC function configuration parameters for performing direct communication between UEs can be used to perform PC5 RRC signaling transmission / reception in unicast mode, transmit / receive V2X messages in unicast mode, transmit / receive V2X messages in broadcast mode, and transmit / receive V2X messages in multicast mode.

[0104] The sidelink direct communication can be used to perform PC5 RRC signaling transmission / reception for configuring and managing unicast connections between UEs, and transmit / receive V2X data that can be exchanged between UEs in unicast, multicast, and broadcast modes. The configuration information required for performing PC5 RRC signaling transmission / reception can include function configuration parameters for each layer, such as packet data convergence protocol (PDCP), radio link control (RLC), media access control (MAC), or physical (PHY). The configuration information required for transmitting / receiving V2X data can include function configuration parameters for each layer, such as PDCP, RLC, MAC, or PHY. This disclosure describes a method of operating the sequence number (SN) size and ARQ configuration parameters among the RLC layer functions applied to PC5 RRC signaling and V2X data. The RLC layer function configuration parameters can be configured according to at least one of a determination method implemented by the UE, a pre-configuration method, a method configured by the BS (RRC dedicated signaling or V2X SIB signaling), and a method configured by the UE (PC5 RRC dedicated signaling, PC5MIB, or PC5 SIB).

[0105] Figure 6A shows a signaling process for operating RLC function configuration parameters to be applied to sidelink RRC according to one embodiment. Figure 6AA method is shown by which the BS configures the RLC function configuration parameters required for configuring a PC5 RRC connection between UEs and notifies the UE thereof. The BS may indicate the configuration of the RLC function configuration parameters required for configuring the PC5 RRC connection and / or update the parameters to new values.

[0106] Reference Figure 6A , in step 601, UE#1 600 may determine a PC5 RRC connection required for a sidelink unicast connection with UE#2 670 and initiate a PC5 RRC configuration process. In step 602, UE#1 600 may transmit a SidelinkUEInformation message to notify the BS 690 of the PC5 RRC connection configuration. In step 603, the BS 690 may configure the information received from UE#1 600 based on the PC5 RRC connection configuration notification, that is, the sidelink radio resources and configuration information required for the PC5 RRC connection configuration. In step 604, the BS 690 may transmit an RRCReconfiguration message or an RRCConnectionReconfiguration message including the information configured in step 603 to UE#1 600. The message in step 604 may include the RLC function configuration parameter information required for the PC5 RRC connection. An embodiment of the RLC function configuration parameter information may include Table 6 as shown below.

[0107] In step 605, UE#1 600 may determine the RLC function configuration parameter information for the PC5 RRC connection with UE#2 670 based on the RLC function configuration parameter information received in step 604. UE#1 600 may notify UE#2 670 of the RLC function configuration parameter information. In step 606, UE#1 600 and UE#2 670 may perform a PC5 RRC connection configuration process based on the RLC function configuration parameter information. A detailed description of the PC5 RRC connection configuration process is omitted. When the RLC function configuration parameter information is not received in step 604, UE#1 600 and UE#2 670 may perform a PC5 RRC connection configuration process based on the RLC function configuration parameter information set in the default configuration. An example of the default configuration is shown in Table 1 as below.

[0108]

Table 1

[0109]

[0110] When transmitting and receiving PC5 RRC connection configuration signaling according to the default configuration or a preset configuration, UE#600 or UE#2670 can receive an RRCReconfiguration message, an RRCConnectionReconfiguration message, or a V2X SIB, where the V2X SIB includes RLC function configuration parameter information for PC5 RRC. This process can correspond to step 604, and an embodiment of the RLC function configuration parameter information can include Table 6, as shown below. UE#1 600 and UE#2 670 can transmit and receive PC5 RRC connection configuration signaling according to the new RLC function configuration parameters for PC5 RRC. UE#1 600 and UE#2 670 that obtain the new RLC function configuration parameters for PC5RRC can notify the other UE (UE#1 or UE#2) of the new RLC function configuration parameters. The PC5 RRC signaling including the new RLC function configuration parameters for PC5 RRC can be transmitted and received by applying the pre-used RLC function configuration parameters (or default configuration). The new RLC function configuration parameters for PC5 RRC can be applied after the PC5 RRC completion signaling corresponding to the PC5 RRC signaling. For example, the PC5 RRC signaling can include an AS configuration and an AS configuration completion. This process can correspond to step 606.

[0111] Figure 6B A signaling process for operating RLC function configuration parameters to be applied to sidelink RRC according to an embodiment is shown.

[0112] Figure 6B A method is shown by which a UE configures RLC function configuration parameters required for configuring a PC5 RRC connection and notifies the other UE of the parameters. The UE can indicate the configuration of the RLC function configuration parameters required for configuring a PC5 RRC connection and / or update the parameters to new values.

[0113] Reference Figure 6B, in step 621, UE#1 600 may determine the PC5 RRC connection required for the sidelink unicast connection with UE#2 670 and initiate the PC5 RRC configuration process. In step 622, UE#1 600 may transmit a SidelinkUEInformation message to notify BS 690 of the PC5 RRC connection configuration. In step 623, BS 690 may configure the information received from UE#1 600 based on the PC5 RRC connection configuration notification, i.e., the sidelink radio resources and configuration information required for the PC5 RRC connection. In step 624, BS 690 may transmit an RRCReconfiguration message and an RRCConnectionReconfiguration message including the information configured in step 623 to UE#1 600. In step 625, UE#1 600 may determine the RLC function configuration parameter information for the PC5 RRC with UE#2 670, as well as the sidelink radio resources and configuration information received in step 624. UE#1 600 may notify UE#2 670 of the RLC function configuration parameter information.

[0114] An embodiment of the RLC function configuration parameter information may include Table 6 as shown below. In step 626, UE#1 600 and UE#2 670 may perform the PC5 RRC connection configuration process based on the RLC function configuration parameter information for the PC5 RRC. The detailed process of the PC5 RRC connection configuration is omitted.

[0115] In step 625, UE#1 600 may determine to use the default configuration in Table 1 as the RLC function configuration parameter for the PC5 RRC with UE#2 670. At this time, UE#1 600 and UE#2 670 may perform the PC5 RRC connection configuration process based on the RLC function configuration parameter information set in the default configuration of Table 1.

[0116] Alternatively, UE #1 and UE #2 may determine changes in the RLC function configuration parameters when transmitting and receiving PC5 RRC connection configuration signaling according to a default configuration or a preset configuration, which may correspond to step 625. UE #1 and UE #2 may transmit PC5 RRC signaling including new RLC function configuration parameter information to the other UE, and the signaling also includes Table 6. The PC5 RRC signaling including new RLC function configuration parameters for PC5 RRC may be transmitted and received by applying pre-used RLC function configuration parameters (or default configuration). The new RLC function configuration parameters for PC5 RRC may be applied after the PC5 RRC completion signaling corresponding to the PC5 RRC signaling. For example, the PC5 RRC signaling may include an AS configuration and an AS configuration completion, which may correspond to step 626.

[0117] The RLC function configuration parameters that can be applied to the transmission / reception of PC5 signaling (e.g., signaling SLRB) may include at least one piece of information in Tables 2, 3, 4, 5, and 6, as follows.

[0118]

Table 2

[0119] RLC mode RLC UM mode RLC AM mode SN size 6 bits 12 bits 12 bits 18 bits

[0120] The RLC function configuration parameters that can be applied to the transmission / reception of V2X data (e.g., data SLRB) may include at least one piece of information in Tables 3, 4, 5, and 6, as follows.

[0121]

Table 3

[0122] RLC mode RLC UM mode RLC AM mode SN size 6 bits 12 bits 12 bits 18 bits ARQ parameter PollByte value PollPDU value

[0123] The RLC function configuration parameters according to Table 3 above may be applied to each unicast-based sidelink SLRB, each broadcast-based sidelink SLRB, or each multicast-based sidelink SLRB. The RLC function configuration parameters may be configured by following at least one of a method implemented by the UE, a preset method, a method configured by the BS, and a method configured by the UE.

[0124] Figure 7 A signaling process for operating RLC function configuration parameters to be applied to sidelink data according to an embodiment is shown.

[0125] Reference Figure 7, in step, UE #1 700 may determine unicast-based sidelink V2X data transmission with UE #2 770. In step 702, UE #1 700 may transmit a SidelinkUEInformation message to notify BS 790 of the unicast-based sidelink V2X data transmission. The information provided by the SidelinkUEInformation message may include the required data rate.

[0126] The information provided by the SidelinkUEInformation message may include at least one parameter in Table 4 and Table 5 shown below, at least one piece of information regarding unicast, multicast, and broadcast, and at least one of a destination identifier, a ProSe QoS indicator (PQI), a QoS flow identifier (QFI), required reliability information, and required latency information. BS 790 may configure the information received from UE #1 700 based on the notification of the unicast-based sidelink V2X data transmission, that is, the sidelink radio resources and configuration information required for unicast-based sidelink data transmission / reception. BS 790 may configure the RLC function configuration parameters with reference to at least one of the broadcast type, destination identifier, PQI, QFI, required reliability information, required latency information, and required data rate provided by the UE. Examples of the RLC function configuration parameters may include at least one parameter in Table 3 shown above and Table 6 shown below.

[0127] In step 704, BS 790 may transmit an RRCReconfiguration message or an RRCConnectionReconfiguration message including the information configured in step 703 to UE #1 700. The message in step 704 may include the RLC function configuration parameter information required for unicast-based sidelink data transmission / reception. In step 705, UE #1 700 may determine the RLC function configuration parameter information for unicast-based sidelink data transmission / reception with UE #2 770 based on the RLC function configuration parameter information received in step 704. The RLC function configuration parameter information may include Table 3, Table 4, Table 5, and Table 6, shown below. In step 706, UE #1 700 and UE #2 770 may perform parameter configuration for sidelink unicast data transmission, which includes the RLC function configuration parameters for unicast-based sidelink data transmission / reception.

[0128] The information by which the UE notifies the BS of the data rate information required for the V2X application (i.e., the V2X data to be transmitted / received in the sidelink) may include at least one piece of information shown in Table 4, shown below.

[0129]

Table 4

[0130]

[0131] In Table 4, the data rate information can be indicated by a data rate index or a data rate value.

[0132] The data rate value can be the value of the data rate required for each V2X application.

[0133] The data rate index can be the index of the data rate required for each V2X application. Considering V2X applications, all available data rates are divided into predetermined portions of data rates, and an index is assigned to each portion. The data rate index can be configured as shown in Table 5 below.

[0134]

Table 5

[0135]

[0136] The SN size in Table 3 and / or the ARQ parameter (e.g., PollPDU or PollByte) in the RLC function configuration parameters can be determined with reference to the data rate information.

[0137] The RLC function configuration parameters can include at least one piece of information in Table 6 as follows.

[0138] RX-AM-RLC can correspond to the RLC function configuration parameters for the receiving UE to use in the RLC AM mode, TX-AM-RLC can correspond to the transmission RLC function configuration parameters for the transmitting UE to use in the RLC AM (acknowledged mode), RX-UM-RLC can correspond to the receiving RLC function configuration parameters for the receiving UE to use in the RLC UM (unacknowledged mode), and TX-UM-RLC can correspond to the RLC function configuration parameters for the transmitting UE to use in the RLC UM mode.

[0139]

Table 6

[0140]

[0141]

[0142] Alternatively, the configured RLC function configuration parameters can be changed, which can be determined by the BS or the UE (UE#1 or UE#2). The RLC function configuration parameters that need to be changed can be transmitted to the other UE (UE#1 or UE#2).

[0143] The BS can manage the mapping information between the data rate information and the information required to configure the RLC function configuration parameters based on the data rate information required by the UE. The parameters such as the SN size in the RLC AM mode, the SN size in the RLC UM mode, and the ARQ parameter configuration (e.g., PollByte or PollPDU). The mapping information can be provided by the V2X server to the BS.

[0144] Figure 7 Embodiments showing that when the UE is in the RRC_Connected state, the UE is in the RRC_Idle state or the RRC_Inactive state and / or the UE is out of the coverage area may include at least one of the following cases.

[0145] (1) The RLC function configuration parameter information may be included in the V2X SIB message transmitted by the BS. The RLC function configuration parameter information included in the V2X SIB message may include at least one parameter in Tables 7 and 8, as follows. The dataRateIndex included in Tables 7 and 8 may refer to Table 5.

[0146]

Table 7

[0147]

[0148]

[0149]

Table 8

[0150]

[0151] (2) The RLC function configuration parameter information may be pre-configured and may include at least one parameter in Tables 9 and 10, as follows. The dataRateIndex included in Tables 9 and 10 may refer to Table 5.

[0152]

Table 9

[0153]

[0154]

Table 10

[0155]

[0156]

[0157] A UE in the RRC_INACTIVE state or a UE in the RRC_IDLE state can receive V2X SIB messages including Table 7 and Table 8 from the BS and obtain RLC function configuration parameter information. A UE in the RRC_INACTIVE state or a UE in the RRC_IDLE state can obtain pre-configured RLC function configuration parameter information in Table 9 and Table 10. A UE beyond the coverage area can obtain pre-configured RLC function configuration parameter information in Table 9 and Table 10.

[0158] When the dataRateIndex is included in Table 7, Table 8, Table 9, and Table 10, the RLC function configuration parameters corresponding to the dataRateIndex for the required data rate can be applied.

[0159] When the dataRate is included in Table 7, Table 8, Table 9, and Table 10, the RLC function configuration parameters corresponding to the dataRate for the required data rate can be applied.

[0160] When the thresDataRate is included in Table 7, Table 8, Table 9, and Table 10, the RLC function configuration parameters can be applied only when the required data rate is less than the thresDataRate. Alternatively, when the thresDataRate is included in Table 7, Table 8, Table 9, and Table 10, the RLC function configuration parameters can be applied only when the required data rate is greater than the thresDataRate.

[0161] The RLC function configuration parameters can be configured as a set of parameters as shown in Table 11 below, and the parameters included in each set can include at least one parameter from Table 6, Table 7, Table 8, Table 9, and Table 10.

[0162]

Table 11

[0163]

[0164]

[0165] When the BS performs configuration in the UE, the index of the RLC function configuration parameter set can be indicated. When the UE notifies the peer UE of the pre-configured or self-selected RLC function configuration parameters, the index of the RLC function configuration parameter set can be indicated. The RLC function configuration parameter set in Table 11 can be indicated and / or configured to be linked to the data rate information. For example, the RLC function configuration parameter set corresponding to data rate A can be indicated and / or configured. The RLC function configuration parameter set corresponding to data rate index B can be indicated and / or configured. For example, the RLC function configuration parameter set corresponding to data rate C can be indicated and / or configured.

[0166] When configuring RLC function configuration parameter information according to the UE implementation, the UE can manage the information in Tables 4 to 11 and configure RLC function configuration parameters such as SN size and / or ARQ parameters based on the data rate information required for V2X data.

[0167] When configuring RLC function configuration parameters for transmitting and receiving broadcast-based sidelink V2X data and / or configuring RLC functions for transmitting and receiving multicast-based sidelink V2X data, the configuration methods of RRC signaling by the BS, the pre-configuration method, the configuration method by PC5 signaling of the UE, and the configuration method by UE implementation can be applied, as Figure 7 shown. Tables 4 to 11 can also be applied.

[0168] Figure 8A A method for a UE to measure and report sidelink resource congestion according to an embodiment is shown. To determine the usage status of sidelink resources (e.g., sidelink resource congestion status), the BS can request the UE to measure and report the congestion of the sidelink resource pool. The UE can be in the RRC_Connected state. The BS can indicate to the UE to configure the measurement and reporting of congestion through an RRCReconfiguration message or an RRCConnectionReconfiguration message. The configuration of the measurement and reporting of congestion can include at least one of event-based reporting and periodic reporting, and at least one piece of sidelink resource pool information to be measured and reported.

[0169] When the BS supports the configuration and allocation of LTE sidelink resources and / or the configuration and allocation of NR sidelink resources, the BS can instruct the UE to measure and report the congestion of the LTE sidelink resource pool and / or the NR sidelink resource pool. The BS can instruct the UE to measure and report the congestion of the sidelink resource pool of the secondary RAT. When the UE is instructed to measure and report the congestion of the sidelink resource pool of the secondary RAT, the UE can measure the congestion through the congestion measurement scheme of the secondary RAT and report the congestion according to the configured reporting scheme. Since the LTE-based channel occupancy rate (CBR) measurement and reporting scheme and the NR-based CBR measurement and reporting scheme can be defined differently, the UE needs to know the indication information indicating whether to follow the LTE scheme or the NR scheme.

[0170] Reference Figure 8A, in step 801, the UE can receive the configuration of SL measurement and reporting of the congestion of the sidelink resource pool from the BS. In step 802, the UE can determine whether the configuration includes the configuration of measurement and reporting of the congestion of the LTE sidelink resource pool. When, based on the determination in step 802, the configuration includes the configuration of measurement and reporting of the congestion of the LTE sidelink resource pool, in step 803, the UE can measure the congestion of the LTE sidelink resource pool and report the congestion according to the reporting configuration. The process of measuring and reporting the congestion of the LTE sidelink resource pool can correspond to the CBR measurement and reporting process defined in LTE-V2X.

[0171] In step 804, the UE can determine whether the configuration in step 801 includes the configuration of measurement and reporting of the congestion of the NR sidelink resource pool. When, based on the determination in step 804, it is found that the configuration includes the configuration of measurement and reporting of the congestion of the NR sidelink resource pool, in step 805, the UE can measure the congestion of the NR sidelink resource pool and report the congestion according to the reporting configuration. The process of measuring and reporting the congestion of the NR sidelink resource pool can correspond to the CBR measurement and reporting process defined in NR-V2X.

[0172] The CBR measurement and reporting process defined in NR-V2X can include the operational processes for determining the NR sidelink frame structure, resource structure, reference signal (RS), and resource pool congestion, and can be different from the process defined in LTE-V2X. When, based on the determination in step 802, the configuration does not include the configuration of measurement and reporting of the congestion of the LTE sidelink resource pool, the UE can proceed to step 804. When, based on the determination in step 804, it is found that the configuration does not include the configuration of measurement and reporting of the congestion of the NR sidelink resource pool, the UE can end the process.

[0173] Figure 8B A method for a UE to measure and report sidelink resource congestion according to an embodiment is shown.

[0174] Reference Figure 8B , in step 821, the UE can receive the configuration of SL measurement and reporting of the congestion of the sidelink resource pool from the BS. In step 822, the UE can determine whether the configuration includes the configuration of measurement and reporting of the congestion of the LTE sidelink resource pool. When, based on the determination in step 822, the configuration includes the configuration of measurement and reporting of the congestion of the LTE sidelink resource pool, in step 823, the UE can measure the congestion of the LTE sidelink resource pool and report the congestion according to the reporting configuration. The process of measuring and reporting the congestion of the LTE sidelink resource pool can correspond to the CBR measurement and reporting process defined in LTE-V2X.

[0175] In step 821, the UE may determine whether the configuration in step 822 includes the configuration for measuring and reporting the congestion of the NR sidelink resource pool. When, based on the determination in step 822, the configuration includes the configuration for measuring and reporting the congestion of the NR sidelink resource pool, in step 824, the UE may measure the congestion of the NR sidelink resource pool and report the congestion according to the reporting configuration. The process of measuring and reporting the congestion of the NR sidelink resource pool may correspond to the CBR measurement and reporting process defined in NR-V2X, which may include the operational procedures for determining the NR sidelink frame structure, resource structure, reference signal (RS), and resource pool congestion, and may be different from the process defined in LTE-V2X.

[0176] The information indicating the configuration for measuring and reporting the congestion of the LTE resource pool and the NR resource pool transmitted by the BS to the UE in step 801 and step 821 may include at least one parameter in Tables 12, 13, and 14, as follows.

[0177] (1) Sidelink resource pool, for which congestion is measured and for which reporting may be configured for each of LTE and NR (see Table 12)

[0178] (2) RAT identifier, which indicates whether there may be a sidelink resource pool for which congestion is measured and for which reporting is configured for LTE or NR (see Table 13)

[0179] (3) Congestion measurement and reporting configuration IE that may be configured for each of LTE and NR (see Table 14)

[0180] The UE may determine the LTE configuration or the NR configuration according to (1), (2), or (3), and may perform LTE-based CBR measurement and reporting for the corresponding sidelink resource pool, or perform NR-based CBR measurement and reporting for the corresponding sidelink resource pool. Table 12 is as follows.

[0181]

Table 12

[0182]

[0183]

[0184] As shown in Table 12, it may include the configurations of the LTE sidelink resource pool and the NR sidelink resource pool, for which CBR measurement and reporting are applied. Table 13 is as follows.

[0185]

Table 13

[0186]

[0187] As shown in Table 13, it may include RAT type information for differentiating between the LTE sidelink resource pool and the NR sidelink resource pool, where CBR measurement and reporting are applied to the resource pool. Table 14 is as follows.

[0188]

Table 14

[0189]

[0190]

[0191] As shown in Table 14, the CBR measurement report configuration information may include separate CBR measurement and reporting configuration IEs for each of LTE and NR.

[0192] Figure 9 A signaling procedure for configuring the sidelink resource allocation mode according to an embodiment is shown.

[0193] When the UE notifies the BS of sidelink information, the SidelinkUEInformation message and / or the UEAssistanceInformation message transmitted may include at least one of the sidelink resource allocation modes (BS scheduling mode 1 and UE scheduling mode 2) that the UE is interested in and the sidelink RAT information (LTE RAT, NR RAT, LTE and NR RAT) that the UE is interested in.

[0194] As follows, Table 15 shows the SidelinkUEInformation message including the sidelink resource allocation mode information and the sidelink RAT information that the UE is interested in. The sidelink resource allocation mode information and / or the sidelink RAT information that the UE is interested in may also be included in the UEAssistanceInformation message.

[0195]

Table 15

[0196]

[0197]

[0198] The BS that receives the sidelink resource allocation mode information and / or the sidelink RAT information that the UE is interested in may refer to the information that the UE is interested in and indicate the sidelink resource allocation and configuration to the UE through the RRCReconfiguration message or the RRCConnectionReconfiguration message.

[0199] Table 16 shows the configuration information of the BS, which includes at least one of the sidelink resource allocation mode information (mode 1, mode 2, or mode 1 and mode 2) indicated to the UE, the destination ID list (unicast, multicast, and broadcast destination IDs), the broadcast type indicator that can be included when it is difficult to identify the broadcast type only by the destination ID, the SLRB ID list (unicast, multicast, and broadcast SLRB IDs), and the RAT type (LTE RAT, NR RAT, LTE and NR RAT). Table 16 is shown below.

[0200]

Table 16

[0201]

[0202]

[0203] Reference Figure 9 , in step 901, UE#1 900 can determine whether to generate a packet in the V2X application, and can determine at least one of the broadcast type, RAT type, and sidelink resource allocation mode corresponding to the packet of the V2X application. The broadcast type can correspond to unicast, multicast, or broadcast. The RAT type can correspond to at least one of LTE and NR. The sidelink resource allocation mode can correspond to at least one of mode 1 and mode 2.

[0204] In step 902, UE#1 900 can notify the BS 990 of at least one of the broadcast type, RAT type, and sidelink resource allocation mode that the UE is interested in, as shown in Table 15 above. The message transmitted by UE#1 900 to the BS 990 in step 902 can include at least one of the SidelinkUEInformation message or the UEAssistanceInformation message. In step 903, the BS 990 can configure the sidelink resource allocation and configuration information of the UE based on the information that the UE is interested in.

[0205] In step 904, the BS 990 can transmit the sidelink resource allocation and configuration information to the UE, as shown in Table 16. The message transmitted by the BS 990 to UE#1 900 in step 904 can include at least one of the RRCReconfiguration message or the RRCConnectionReconfiguration message. In step 905, UE#1 900 can perform the V2X packet transmission / reception process according to the received configuration information.

[0206] A method of operating an SLRB configuration based on PQL, QFI, and QoS requirements for V2X applications will now be described with reference to FIG. 10. When the PQI, QFI, and QoS requirements are the same or compatible for V2X packets generated in one or more V2X applications, V2X application packet transmission / reception can be performed in the same SLRB. When the PQI, QFI, and QoS requirements are different for V2X packets generated in one or more V2X applications, the SLRB corresponding to each PQI or QFI can be configured separately, and V2X application packet transmission / reception can be performed.

[0207] Figure 10A A signaling procedure for operating a sidelink bearer according to an embodiment is shown. Figure 10A A signal flow for configuring a new PC5 RRC unicast connection between UEs is shown.

[0208] Referring to Figure 10A , in step 1001, UE#1 1000 may determine the generation of V2X packets corresponding to a V2X application and determine the broadcast type of the V2X packets. When the broadcast type of the V2X packets is unicast, in step 1002, UE#1 1000 may identify whether a preset sidelink PC5 RRC configuration can be used. When it is determined in step 1003 that a new sidelink PC5 RRC configuration is required for the V2X packets, in step 1004, UE#1 1000 may perform a PC5 RRC connection configuration and an SLRB configuration procedure with UE#2 1090. In step 1005, UE#1 1000 may determine to transmit the V2X packets to the configured SLRB, and in step 1006, the V2X packets may be transmitted to UE#2 1090 through the configured SLRB.

[0209] Figure 10B A signaling procedure for operating a sidelink bearer according to an embodiment is shown, that is, a signal flow for transmitting and receiving V2X packets through preset PC5 RRC unicast connection configuration information when V2X packets for the same V2X application are generated between UEs.

[0210] Referring to Figure 10B, in step 1021, UE#1 1000 and UE#2 1090 may have PC5 RRC configuration and SLRB configuration. In step 1022, UE#1 1000 may determine the generation of V2X packets corresponding to the V2X application and determine the broadcast type of the V2X packets. When the broadcast type of the V2X packets is unicast, in step 1023, UE#1 1000 may determine whether the V2X packets belong to the SLRB of the preset sidelink PC5 RRC. When it is determined in step 1024 that the V2X packets can be transmitted through the preset SLRB, in step 1025, UE#1 1000 may transmit the V2X packets to UE#2 1090 through the configured SLRB.

[0211] Figure 10C Fig. shows a signaling procedure for operating a sidelink bearer, that is, shows a signal flow for configuring a new unicast-based PC5 SLRB when generating V2X packets for a new V2X application between UEs.

[0212] Reference Figure 10C , in step 1041, UE#1 1000 and UE#2 1090 may have PC5 RRC configuration and SLRB configuration. In step 1042, UE#1 1000 may determine the generation of V2X packets corresponding to the V2X application and determine the broadcast type of the V2X packets. When the broadcast type of the V2X packets is unicast, in step 1043, UE#1 1000 may determine whether the V2X packets belong to the SLRB of the preset sidelink PC5 RRC. When it is determined in step 1044 that the V2X packets cannot be transmitted through the preset SLRB, UE#1 1000 may determine the necessity of a new SLRB configuration for transmitting the V2X packets. In step 1045, UE#1 1000 and UE#2 1090 may perform a sidelink PC5 RRC configuration procedure for the new SLRB configuration. In step 1046, UE#1 1000 may transmit the V2X packets to UE#2 1090 through the configured SLRB.

[0213] Although Figure 10A 、 Figure 10B and Figure 10C only shows the signal flow between two UEs for performing the PC5 RRC connection configuration procedure and the SLRB configuration procedure using the PC5 RRC connection, but when receiving the PC5 RRC connection configuration and SLRB configuration information from the BS, the signal flow with the BS can be defined.

[0214] Figure 11AA method for a UE to handle source identifier update for sidelink according to an embodiment is shown. For example, on the peer UE side for performing sidelink unicast, the destination identifier (DST ID) and the source identifier (SRC ID) may be the same.

[0215] SRC ID of UE#1 = DST ID of UE#2

[0216] SRC ID of UE#2 = DST ID of UE#2

[0217] The V2X system based on sidelink should be able to change the SRC ID to prevent the problem of tracking the source UE. In the case of sidelink unicast, since the SRC ID of the UE may correspond to the DST ID of the peer UE, there may be a problem of changing the DST ID. Since the change of the SRC ID and the change of the DST ID can be interpreted as an indication of a new PC5 RRC connection, the two UEs connected by unicast should be able to distinguish when the SRC ID and the DST ID need to be changed and when a new PC5 RRC connection or a new PC5 SLRB configuration is needed. When the SRC ID and the DST ID change, the regular PC5 RRC connection can be maintained. When the SRC ID and the DST ID change, the regular PC5 SLRB configuration can be maintained.

[0218] The UE with the changed SRC ID can provide a notification of the SRC ID change from the upper layer of the UE to the RRC layer, and can notify the peer UE that the DST ID needs to be changed. The UE that needs a new PC5 RRC connection can provide a notification of the necessity of a new PC5 RRC connection from the upper layer of the UE to the RRC layer. The UE can notify the peer UE that a new PC5 RRC connection is needed. Alternatively, the UE with a new PC5 SLRB configuration can provide a notification of the necessity of a new PC5 SLRB configuration from the upper layer of the UE to the RRC layer. The UE can notify the peer UE that a new PC5 configuration is needed. The UE with a sidelink unicast connection can manage the SLRBID, SRC ID, and DST ID mapping information. The UE with a sidelink unicast connection can manage the list of SLRBIDs mapped to the PC5 RRC. The UE with a sidelink unicast connection can manage the SRC ID and DST ID information mapped to the PC5 RRC.

[0219] Reference Figure 11A, in step 1102, the UE can determine whether to indicate a new PC5 RRC connection configuration while maintaining the PC5 RRC connection in step 1101. When a new PC5 RRC connection configuration is indicated according to the determination in step 1102, in step 1104, the UE can perform a new PC5 RRC connection configuration procedure. When a change in the SRC ID (source ID) is indicated according to the determination in step 1103, in step 1105, the UE can perform an SRC ID change procedure for the regular PC5 RRC connection. Steps 1102 and 1103 can involve information indicated from an upper layer of one UE to the RRC layer, and this information can be indicated through the PC5 RRC connection between two UEs.

[0220] Figure 11B FIG. shows a method for updating a source identifier for handling a sidelink of a UE according to an embodiment.

[0221] Reference Figure 11B , in step 1122, the UE can determine whether to indicate a new PC5 SLRB configuration while maintaining the PC5 RRC connection in step 1121. When a new SLRB configuration is indicated according to the determination in step 1122, in step 1124, the UE can perform a new SLRB configuration procedure. When a change in the SRC ID is indicated according to the determination in step 1123, in step 1125, the UE can perform an SRC ID change procedure for the regular SLRB. When the determination in step 1123 does not indicate a change in the SRC ID, step 1121 is repeated. Steps 1122 and 1123 can correspond to an internal procedure of one UE, which is a new SLRB configuration indication and an RRC ID change indication from the upper layer to the RRC layer, and can be a new SLRB configuration indication and an SRC ID change indication configured through the PC5 RRC connection between two UEs via the PC5 RRC unicast connection.

[0222] Figure 11A and Figure 11B can be performed by two UEs connected by a sidelink unicast connection.

[0223] Figure 12 FIG. shows a signaling procedure for updating a source identifier for handling a sidelink according to an embodiment.

[0224] Reference Figure 12, in step 1201, UE#1 1200 and UE#2 1270 may have a PC5 RRC unicast connection. The SLRB configured through the PC5 RRC unicast connection may correspond to SLRB = 1. On the UE#1 1200 side, SRC ID = 10 and DST ID = 20, and on the UE#2 1270 side, SRC ID = 20 and DST ID = 10. In step 1202, UE#1 1200 may determine the necessity for a new PC5 RRC unicast connection or a new SLRB configuration. In steps 1203 and 1204, UE#1 1200 and UE#2 1270 may perform PC5 RRC unicast connection configuration and new SLRB configuration. Through the processes in steps 1203 and 1204, in step 1205, UE#1 1200 and UE#2 1270 may have SLRB 2.

[0225] In step 1206, UE#2 1270 may determine the necessity to change its own SRC ID for SLRB 1, where the SRC ID is the DST ID of UE#1 1200. In steps 1207 and 1208, UE#2 1270 and UE#1 1200 may perform a process to change the DST ID of UE 1 (i.e., the SRC ID of UE#2) for SLRB 1. After steps 1207 and 1208, in step 1209, UE#1 1200 and UE#2 1270 may configure SRC ID = 10 and DST ID = 30 on the UE#1 side, and configure SRC ID = 30 and DST ID = 10 on the UE#2 side according to SLRB 1.

[0226] A method for operating sidelink logical channel priority (LCP) may include at least one of the following methods.

[0227] Method 1: The priority information of the sidelink logical channel corresponding to the V2X packet or V2X flow may use the default priority values of the 5 QIs of the V2X packet or V2X flow. Examples of the 5 QIs are shown in Table 17 below. The PQI that can be applied to the V2X sidelink may be derived based on the 5 QIs, and the priority of the PQI may be configured to follow the default priority values. Alternatively, the priority of the PQI may be configured based on the default priority values.

[0228] The AS layer of the UE can determine the priority value of the logical channel corresponding to the V2X flow or V2X packet according to the priority of the PQI of the V2X flow or V2X packet, and perform LCP according to the priority. For example, assume that the higher the priority value, the lower the priority. The logical channel corresponding to the V2X flow or V2X packet with a high priority (low priority value) can be preferentially scheduled. PC5 RRC can have a higher priority than the V2X packet. Table 17 is as follows.

[0229]

Table 17

[0230]

[0231]

[0232] Method 2: The V2X layer can configure the priority value that can be applied to the V2X packet or V2X flow. The operation of assigning the priority value to the V2X packet or V2X flow can follow the rules of the upper layer. The AS layer of the UE can determine the priority of the logical channel corresponding to the V2X flow or V2X packet based on the priority value of the V2X flow or V2X packet, and can perform LCP according to the priority.

[0233] For example, assume that the higher the priority value, the lower the priority. The logical channel corresponding to the V2X flow or V2X packet with a high priority (low priority value) can be preferentially scheduled. PC5 RRC can have a higher priority than the V2X packet.

[0234] A method for selecting a sidelink resource pool for direct link setup between higher layer UEs and / or PC5 RRC connection setup between UEs can include at least one of the following methods.

[0235] (1) Use the broadcast pool until the PC5 RRC connection establishment is completed, and then use the unicast pool for V2X data traffic.

[0236] (2) Use the unicast pool for the entire direct link setup process, which includes PC5 RRC connection establishment.

[0237] (3) Use the broadcast pool before the PC5 RRC connection establishment signaling.

[0238] (4) Use the broadcast pool before the PC5 RRC connection establishment signaling that requires HARQ feedback.

[0239] The method disclosed according to the embodiments described herein can be implemented by hardware, software, or a combination of hardware and software.

[0240] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) can be provided. One or more programs stored in the computer-readable storage medium can be configured to be executed by one or more processors within the electronic device. The at least one program can include instructions that cause the electronic device to execute the method according to an embodiment of the present disclosure.

[0241] The program (software module or software) can be stored in non-volatile memory, which includes random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compact disc ROM (CD-ROM), digital versatile disc (DVD), or other types of optical storage devices, or magnetic tapes. Alternatively, any combination of some or all of these memories can form the memory for storing the program. Multiple such memories can be included in the electronic device.

[0242] In addition, the program can be stored in an attachable storage device, which can access the electronic device through a communication network such as the Internet, intranet, local area network (LAN), wide area LAN (WLAN), and storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device via an external port. An independent storage device on the communication network can access the portable electronic device.

[0243] Although the present disclosure has been specifically shown and described with reference to certain embodiments of the present disclosure, those of ordinary skill in the art will understand that various changes in form and detail can be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a first user equipment (UE) in a wireless communication system, the method comprising: Send a SidelinkUEInformation message to a base station BS, where the SidelinkUEInformation message includes information related to sidelink transmission, and the information includes a broadcast type, a destination identifier, a quality of service QoS flow identifier, and data rate information; Receive, from the BS, a radio resource control RRC reconfiguration message including a radio link control RLC function configuration, where the RLC function configuration is configured based on the data rate information included in the SidelinkUEInformation message; and Perform sidelink communication with a second UE based on the received RLC function configuration.

2. The method according to claim 1, wherein performing the sidelink communication comprises: Determine whether conditions for configuring a sidelink radio bearer SLRB are met; Transmit, when the conditions are met, a first RRC message associated with the sidelink communication to the second UE; Receive, from the second UE, a second RRC message associated with the sidelink communication; And Perform the sidelink communication with the second UE.

3. A method performed by a base station (BS) in a wireless communication system, the method comprising: Receive a SidelinkUEInformation message from a first user equipment UE, where the SidelinkUEInformation message includes information related to sidelink transmission, and the information includes a broadcast type, a destination identifier, a quality of service QoS flow identifier, and data rate information; Configure a radio link control RLC function configuration based on the data rate information included in the SidelinkUEInformation message; and And Transmit a radio resource control RRC reconfiguration message including the RLC function configuration to the first UE, where the transmitted RLC function configuration corresponds to the communication between the first UE and the second UE.

4. A first user equipment (UE), comprising: A transceiver configured to transmit and receive at least one signal; And A controller connected to the transceiver, where the controller is configured to: Send a SidelinkUEInformation message to a base station BS, where the SidelinkUEInformation message includes information related to sidelink transmission, and the information includes a broadcast type, a destination identifier, a quality of service QoS flow identifier, and data rate information, Receive, from the BS, a radio resource control RRC reconfiguration message including a radio link control RLC function configuration, where the RLC function configuration is configured based on the data rate information included in the SidelinkUEInformation message, and Perform sidelink communication with a second UE based on the received RLC function configuration.

5. The first UE according to claim 4, wherein the controller is further configured to: determine whether conditions for configuring a sidelink radio bearer (SLRB) are met, transmit a first RRC message associated with the sidelink communication to the second UE when the conditions are met, receive a second RRC message associated with the sidelink communication from the second UE, and perform the sidelink communication with the second UE.

6. A base station (BS), comprising: A transceiver configured to transmit and receive at least one signal; And A controller connected to the transceiver, where the controller is configured to: Receive a Sidelink UE Information message from a first user equipment (UE), the Sidelink UE Information message including information related to sidelink transmission, wherein the information includes a broadcast type, a destination identifier, a quality of service (QoS) flow identifier, and data rate information; Configure a radio link control (RLC) function configuration based on the data rate information included in the Sidelink UE Information message; And Transmit a radio resource control (RRC) reconfiguration message including the RLC function configuration to the first UE, and wherein the transmitted RLC function configuration corresponds to communication between the first UE and a second UE.

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