Patent Description:
To meet the demand for wireless data traffic having increased since deployment of 4th generation (<NUM>) communication systems, efforts have been made to develop an improved 5th generation (<NUM>) or pre-<NUM> communication system. Therefore, the <NUM> or pre-<NUM> communication system is also called a 'Beyond <NUM> Network' or a 'Post Long Term Evolution (LTE) System'.

In the <NUM> system, Hybrid frequency shift keying (FSK) and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.

In the <NUM> system, radio interface methods for providing services of various quality of service (QoS) requirements are discussed. For example, a direct communication scheme for a vehicle to everything (V2X) terminal is suggested. Further, various discussions are under way to shorten communication time, enhance reliability, and more efficiently support direct communication between terminals.

Documents of the prior art to be mentioned are document <NPL>, document <NPL>, document "<NPL>, document "<NPL>, document "<NPL>, and document "<NPL>.

To address the above-discussed deficiencies of the prior art, it is a primary aspect of the disclosure to provide apparatuses and methods for supporting vehicle communication service and data transmission which achieve high reliability and low-latency requirement by providing a direct communication scheme between terminals in a vehicle communication system.

According to various aspects of the disclosure, a method performed by a first user equipment, UE, as according to claim <NUM> is provided.

According to various aspects of the disclosure, a first UE as according to claim <NUM> is provided.

According to various aspects of the disclosure, a method performed by a base station, BS, as according to claim <NUM> is provided.

According to various aspects of the disclosure, a base station as according to claim <NUM> is provided.

Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures.

The embodiment disclosed with respect to <FIG> is covered by the claimed invention. The further embodiments are not or only partly encompassed by the wording of the claims but are considered as useful for understanding the invention.

In various embodiments of the disclosure to be described below, a hardware approach will be described as an example. However, since the various embodiments of the disclosure include a technology using both hardware and software, the various embodiments of the disclosure do not exclude a software-based approach.

Hereafter, the disclosure relates to an apparatus and a method for acquiring a configuration parameter of a sidelink radio bearer corresponding to quality of service (QoS) requirements of vehicle to everything (V2X) communication in a wireless communication system. Specifically, the disclosure provides a technique for satisfying a required QoS level for various V2X services based on the sidelink radio bearer configuration parameter acquisition method for sidelink direct communication between V2X terminals in the wireless communication system.

Terms indicating signals, terms indicating channels, terms indicating control information, terms indicating network entities, and terms indicating components of an apparatus, which are used in the following descriptions, are for the sake of explanations. Accordingly, the disclosure is not limited to the terms to be described, and may use other terms having technically identical meaning.

The disclosure describes various embodiments by using terms used in some communication standards (e.g., <NUM>rd generation partnership project (3GPP)), which is merely an example for the explanations. Various embodiments of the disclosure may be easily modified and applied in other communication systems.

<FIG> illustrates a wireless communication system. <FIG> depicts a base station <NUM>, a terminal <NUM>, and a terminal <NUM>, as some of nodes which use radio channels in the wireless communication system. While <FIG> depicts the single base station, other base station identical to or similar to the base station <NUM> may be further included. While <FIG> depicts only the two terminals, other terminal identical to or similar to the terminal <NUM> and the terminal <NUM> may be further included.

The base station <NUM> is a network infrastructure which provides radio access to the terminals <NUM> and <NUM>. The base station <NUM> has coverage defined as a geographical area, based on a signal transmission distance. The base station <NUM> may be referred to as an access point (AP), an eNodeB (eNB), a 5th generation node (<NUM> node), a <NUM> gNodeB (gNB), a wireless point, a transmission/reception point (TRP), or other term having a technically equivalent meaning.

The terminal <NUM> and the terminal <NUM> each are a device used by a user, and communicate with the base station <NUM> over the radio channel. In some cases, at least one of the terminal <NUM> and the terminal <NUM> may operate without user's involvement. That is, at least one of the terminal <NUM> and the terminal <NUM> performs machine type communication (MTC) and may not be carried by the user. The terminal <NUM> and the terminal <NUM> each may be referred to as a user equipment (UE), a mobile station, a subscriber station, a remote terminal, a wireless terminal, a user device, or other term having a technically equivalent meaning.

The base station <NUM>, the terminal <NUM>, and the terminal <NUM> may transmit and receive radio signals in a millimeter wave (mmWave) band (e.g., <NUM>, <NUM>, <NUM>, <NUM>). To improve a channel gain, the base station <NUM>, the terminal <NUM>, and the terminal <NUM> may conduct beamforming. Herein, the beamforming may include transmit beamforming and receive beamforming. That is, the base station <NUM>, the terminal <NUM>, and the terminal <NUM> may apply directivity to a transmit signal or a receive signal. For doing so, the base station <NUM> and the terminals <NUM> and <NUM> may select serving beams <NUM>, <NUM>, <NUM>, and <NUM> through beam search or beam management. After the serving beams <NUM>, <NUM>, <NUM>, and <NUM> are selected, communications may be performed using resources which are quasi co-located (QCL) with resources which carry the serving beams <NUM>, <NUM>, <NUM>, and <NUM>.

If large-scale properties of a channel which carries a symbol on a first antenna port may be inferred from a channel which carries a symbol on a second antenna port, the first antenna port and the second antenna port may be said to be QCL. For example, the large-scale properties may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial receiver parameter.

<FIG> illustrates a configuration of a base station in a wireless communication system. The configuration of <FIG> may be understood as the configuration of the base station <NUM>. A term such as 'portion' or '~ er' indicates a unit for processing at least one function or operation, and may be implemented using hardware, software, or a combination of hardware and software.

Referring to <FIG>, the base station includes a wireless communication unit <NUM>, a backhaul communication unit <NUM>, a storage unit <NUM>, and a control unit <NUM>.

The wireless communication unit <NUM> may transmit and receive signals over a radio channel. For example, the wireless communication unit <NUM> performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, in data transmission, the wireless communication unit <NUM> generates complex symbols by encoding and modulating a transmit bit string. Also, in data reception, the wireless communication unit <NUM> restores a receive bit string by demodulating and decoding a baseband signal.

Also, the wireless communication unit <NUM> up-converts the baseband signal to a radio frequency (RF) band signal, transmits it via an antenna, and down-converts an RF band signal received via an antenna to a baseband signal. For doing so, the wireless communication unit <NUM> may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. In addition, the wireless communication unit <NUM> may include a plurality of transmit and receive paths. Further, the wireless communication unit <NUM> may include at least one antenna array including a plurality of antenna elements.

In view of hardware, the wireless communication unit <NUM> may include a digital unit and an analog unit, and the analog unit may include a plurality of sub-units according to an operating power and an operating frequency. The digital unit may include at least one processor (e.g., a digital signal processor (DSP)).

As such, the wireless communication unit <NUM> transmits and receives the signals. Hence, whole or part of the wireless communication unit <NUM> may be referred to as a transmitter, a receiver, or a transceiver. In the following, the transmission and the reception over the radio channel embrace the above-stated processing of the wireless communication unit <NUM>.

The backhaul communication unit <NUM> provides an interface for communicating with other nodes in the network. That is, the backhaul communication unit <NUM> converts a bit string transmitted from the base station to another node, for example, to another access node, another base station, an upper node, or a core network, to a physical signal, and converts a physical signal received from the other node to a bit string.

The storage unit <NUM> stores a basic program for operating the base station, an application program, and data such as setting information. The storage unit <NUM> may include a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The storage unit <NUM> provides the stored data in response to a request of the control unit <NUM>.

The control unit <NUM> controls general operations of the base station. For example, the control unit <NUM> transmits and receives signals through the wireless communication unit <NUM> or the backhaul communication unit <NUM>. Also, the control unit <NUM> records and reads data in and from the storage unit <NUM>. The control unit <NUM> may execute functions of a protocol stack requested by a communication standard. According to other embodiment, the protocol stack may be included in the wireless communication unit <NUM>. For doing so, the control unit <NUM> may include at least one processor.

According to various embodiments, the control unit <NUM> may transmit radio resource control (RRC) configuration information to the terminal <NUM>. The control unit <NUM> may transmit sidelink configuration information to the terminal <NUM>. For example, the control unit <NUM> may control the base station to carry out operations to be explained according to various embodiments.

<FIG> illustrates a configuration of a terminal in a wireless communication system. The configuration of <FIG> may be understood as the configuration of the terminal <NUM> or the terminal <NUM>. A term such as 'portion' or '~ er' indicates a unit for processing at least one function or operation, and may be implemented using hardware, software, or a combination of hardware and software.

Referring to <FIG>, the terminal includes a communication unit <NUM>, a storage unit <NUM>, and a control unit <NUM>.

The communication unit <NUM> may transmit and receive signals over a radio channel. For example, the communication unit <NUM> performs a conversion function between a baseband signal and a bit string according to a physical layer standard of the system. For example, in data transmission, the communication unit <NUM> generates complex symbols by encoding and modulating a transmit bit string. Also, in data reception, the communication unit <NUM> restores a receive bit string by demodulating and decoding a baseband signal. Also, the communication unit <NUM> up-converts the baseband signal to an RF band signal, transmits it via an antenna, and down-converts an RF band signal received via the antenna to a baseband signal. For example, the communication unit <NUM> may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

Also, the communication unit <NUM> may include a plurality of transmit and receive paths. Further, the communication unit <NUM> may include at least one antenna array including a plurality of antenna elements. In view of the hardware, the communication unit <NUM> may include a digital circuit and an analog circuit (e.g., an RF integrated circuit (RFIC)). Herein, the digital circuit and the analog circuit may be implemented as a single package. Also, the communication unit <NUM> may include a plurality of RF chains. Further, the communication unit <NUM> may perform the beamforming.

The communication unit <NUM> may include different communication modules for processing signals of different frequency bands. Further, the communication unit <NUM> may include a plurality of communication modules for supporting different radio access technologies. For example, different radio access technologies may include Bluetooth low energy (BLE), wireless fidelity (Wi-Fi), WiFi Gigabyte (WiGig), and a cellular network (e.g., Long Term Evolution (LTE)). Different frequency bands may include a super high frequency (SHF) (e.g., <NUM>, <NUM>) band and a millimeter weave (e.g., <NUM>, <NUM>) band.

As such, the communication unit <NUM> transmits and receives the signals. Hence, whole or part of the communication unit <NUM> may be referred to as a transmitter, a receiver, or a transceiver. Hereafter, the transmission and the reception over the radio channel embrace the above-stated processing of the communication unit <NUM>.

The storage unit <NUM> stores a basic program for operating the terminal, an application program, and data such as setting information. The storage unit <NUM> may include a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. The storage unit <NUM> provides the stored data according to a request of the control unit <NUM>.

The control unit <NUM> controls general operations of the terminal. For example, the control unit <NUM> transmits and receives signals through the communication unit <NUM>. Also, the control unit <NUM> records and reads data in and from the storage unit <NUM>. The control unit <NUM> may execute functions of a protocol stack required by a communication standard. For doing so, the control unit <NUM> may include at least one processor or microprocessor, or may be part of a processor. Part of the communication unit <NUM> and the control unit <NUM> may be referred to as a communication processor (CP).

According to various embodiments, if the terminal <NUM> performs sidelink direct communication with other terminal, the control unit <NUM> may perform determining at the terminal <NUM> service information required by a V2X application, determining a V2X transmission mode (unicast, groupcast, broadcast), determining QoS information of the V2X service, obtaining sidelink radio bearer configuration information corresponding to the QoS information from the base station, and transmitting and receiving V2X packets of the direct communication using the obtained sidelink radio bearer configuration information. For example, the control unit <NUM> may control the terminal to carry out operations, to be explained, according to various embodiments.

<FIG>, <FIG>, and <FIG> illustrate a configuration of a communication unit in a wireless communication system. <FIG>, <FIG>, and <FIG> depict a detailed configuration of the wireless communication unit <NUM> of <FIG> or the communication unit <NUM> of <FIG>. More specifically, <FIG>, <FIG>, and <FIG> depict components for performing the beamforming, as part of the wireless communication unit <NUM> of <FIG> or the communication unit <NUM> of <FIG>.

Referring to <FIG>, the wireless communication unit <NUM> or the communication unit <NUM> includes an encoder and modulator <NUM>, a digital beamformer <NUM>, a plurality of transmit paths <NUM>-<NUM> through <NUM>-N, and an analog beamformer <NUM>.

The encoder and modulator <NUM> performs channel encoding. For the channel encoding, at least one of low density parity check (LDPC) code, convolution code, and polar code may be used. The encoder and modulator <NUM> generates modulation symbols through constellation mapping.

The digital beamformer <NUM> beamforms a digital signal (e.g., the modulation symbols). For doing so, the digital beamformer <NUM> multiplies the modulation symbols by beamforming weights. Herein, the beamforming weights are used to change an amplitude and a phase of the signal, and may be referred to as a precoding matrix or a precoder. The digital beamformer <NUM> outputs the digital-beamformed modulation symbols to the transmit paths <NUM>-<NUM> through <NUM>-N. In so doing, according to multiple input multiple output (MIMO) transmission, the modulation symbols may be multiplexed or the same modulation symbols may be fed to the transmit paths <NUM>-<NUM> through <NUM>-N.

The transmit paths <NUM>-<NUM> through <NUM>-N convert the digital-beamformed digital signals to analog signals. For doing, the transmit paths <NUM>-<NUM> through <NUM>-N each may include an inverse fast fourier transform (IFFT) operator, a cyclic prefix (CP) adder, a DAC, and an up-converter. The CP adder is used for orthogonal frequency division multiplexing (OFDM) and may be excluded if another physical layer scheme (e.g., filter bank multi-carrier (FBMC)) is applied. That is, the transmit paths <NUM>-<NUM> through <NUM>-N provide an independent signal process for a plurality of streams generated through the digital beamforming. Notably, depending on the implementation, some of the components of the transmit paths <NUM>-<NUM> through <NUM>-N may be used in common.

The analog beamformer <NUM> beamforms the analog signals. For doing so, the digital beamformer <NUM> multiplies the analog signals by the beamforming weights. Herein, the beamforming weights are used to change the amplitude and the phase of the signal. More specifically, the analog beamformer <NUM> may be configured as shown in <FIG> or <FIG>, according to a connection structure between the transmit paths <NUM>-<NUM> through <NUM>-N and the antennas.

Referring to <FIG>, signals inputted to the analog beamformer <NUM> are converted in phase/amplitude, amplified, and then transmitted via the antennas. In so doing, signals of each path are transmitted via different antenna sets, that is, antenna arrays. Signals inputted in a first path are converted by phase/amplitude converters <NUM>-<NUM>-<NUM> through <NUM>-<NUM>-M to signal strings having different or the same phase/amplitude, amplified by amplifiers <NUM>-<NUM>-<NUM> through <NUM>-<NUM>-M, and then transmitted via the antennas.

Referring to <FIG>, signals inputted to the analog beamformer <NUM> are converted in phase/amplitude, amplified, and then transmitted via antennas. In so doing, signals of each path are transmitted via the same antenna set, that is, the same antenna array. Signals inputted in the first path are converted by the phase/magnitude converters <NUM>-<NUM>-<NUM> through <NUM>-<NUM>-M to signal strings having different or the same phase/amplitude, and amplified by the amplifiers <NUM>-<NUM>-<NUM> through <NUM>-<NUM>-M. To transmit via a single antenna array, the amplified signals are summed by adders <NUM>-<NUM>-<NUM> through <NUM>-<NUM>-M based on the antenna element and then transmitted via the antennas.

The independent antenna array is used per transmit path in <FIG>, and the transmit paths share the single antenna array in <FIG>. However, according to another embodiment, some transmit paths may use the independent antenna array, and the rest transmit paths may share one antenna array. Further, according to yet another embodiment, by applying a switchable structure between the transmit paths and the antenna arrays, a structure which adaptively changes according to a situation may be used.

The V2X service may be divided into a basic safety service and an advanced service. The basic safety service may correspond to a vehicle notification service (cooperative awareness message (CAM) or basic safety message (BSM)) and specific services such as a left-turn notification service, a forward collision warning service, an emergency vehicle approaching notification service, a frontal obstacle warning service, an intersection signal information service, and may transmit and receive V2X information using the broadcast, unicast, or groupcast transmission. The advanced service not only strengthens QoS requirements more than the basic safety service but also requires a method for transmitting and receiving V2X information using the unicast and groupcast transmission besides the broadcast transmission so as to transmit and receive the V2X information in a specific vehicle group or transmit and receive the V2X information between two vehicles. The advanced service may correspond to specific services such as a platooning service, an autonomous driving service, a remote driving service, an extended sensor-based V2X service.

For the V2X service, a UE in a ng-radio access network (RAN) (gNB) connected to a <NUM> core network or an evolved universal terrestrial radio access network (E-UTRAN) (ng-eNB) connected to the <NUM> core network may perform the V2X service via the ng-RAN or the E-UTRAN. In other embodiment, if the base station (ng-RAN or ng-eNB) is connected to an evolved packet core (EPC) network, the V2X service may be performed via the base station. In other embodiment, if the base station (eNB) is connected to the EPC network, the V2X service may be performed via the base station. In so doing, a V2X radio interface communication scheme available for direct communication between UEs is at least one of the unicast, the groupcast, and the broadcast, and each communication scheme needs to provide a method for managing and configuring a radio communication parameter appropriate for QoS requirements of the V2X service in the V2X transmission and reception.

A direct communication system between UEs based on LTE wireless communication defines that a TX UE selects and manages a parameter required for the transmission. The LTE wireless communication transmits a V2X service message for the basic safety in the direct communication not strict and, though the basic safety service is various, the QoS requirements between the services are not various and are not differentiated notably. Hence, in a mode for scheduling radio resources for the direct communication between UEs based on the LTE wireless communication, the base station schedules the radio resources without having to acquire specific QoS requirement information of the V2X service and the UE arbitrarily manages and configures the parameter.

The advanced V2X service has various QoS requirements and a required QoS level differs per V2X service. A particular advanced V2X service may be provided by configuring the radio resources and the radio parameter for the direct communication so as to satisfy the strict QoS requirements of the service. Thus, the direct communication system between UEs for supporting the advanced V2X service needs to provide a method for guaranteeing the QoS of the service, compared to a conventional system. In a mode in which the base station schedules the radio resources for the direct communication, the base station needs to perform an appropriate scheduling for a required level by acquiring detailed QoS information of the V2X service of the UE.

The disclosure provides a method for determining QoS information corresponding to a sidelink radio access bearer for vehicle-to-vehicle direct communication required in the basic safety service and the advanced service, and acquiring a configuration parameter corresponding to the QoS information according to various embodiments.

<FIG> illustrates a situation of direct communication between UEs using sidelink RAT.

<FIG> illustrates a scenario in which UEs performs the direct communication in gNB coverage. In <FIG>, sidelink radio bearer configuration parameter information to be used for V2X packet transmission and reception based the unicast, the broadcast, or the groupcast between the UEs may be transmitted or pre-configured through a system information message or an RRC dedicated message of the gNB. The UE which performs the direct communication may transmit QoS information corresponding to the V2X service to the base station and acquire the sidelink radio bearer configuration parameter information from the base station. The UE which performs the direct communication may determine QoS information corresponding to the V2X service, arbitrarily configure some configuration parameter of the sidelink radio bearer and acquire some configuration parameter from the pre-configured information.

<FIG> illustrates a scenario in which UEs in ng-eNB coverage performs the direct communication. In <FIG>, sidelink radio bearer configuration parameter information to be used for V2X packet transmission and reception based the unicast, the broadcast, or the groupcast between the UEs may be transmitted through a system information message or an RRC dedicated message of the ng-eNB or pre-configured. The UE which performs the direct communication may transmit QoS information corresponding to the V2X service to the ng-eNB and acquire the sidelink radio bearer configuration parameter information from the base station. The UE which performs the direct communication may determine QoS information corresponding to the V2X service, arbitrarily configure some configuration parameter of the sidelink radio bearer and acquire some configuration parameter from the pre-configured information.

<FIG> illustrates a scenario in which a UE <NUM> in gNB coverage and a UE <NUM> in eNB coverage perform the direct communication. Sidelink radio bearer configuration parameter information to be used for the V2X packet transmission and reception based the unicast, the broadcast, or the groupcast between the UEs may be transmitted through the system information message or the RRC dedicated message of the gNB or pre-configured. The UE which performs the direct communication may transmit QoS information corresponding to the V2X service to the gNB and acquire the sidelink radio bearer configuration parameter information from the base station. The UE which performs the direct communication may determine QoS information corresponding to the V2X service, arbitrarily configure some configuration parameter of the sidelink radio bearer and acquire some configuration parameter from the pre-configured information. In the unicast or groupcast direct communication, the UE in the gNB coverage may transmit the QoS information corresponding to the V2X service to the gNB, instead of the UE in the eNB coverage, and acquire the sidelink radio bearer configuration parameter information from the base station. The UEs of the direct communication, even in the base station coverage, may determine the QoS information corresponding to the V2X service from information arbitrarily selected by the UE or the pre-configured information and acquire the sidelink radio bearer configuration parameter.

<FIG> illustrates a scenario in which UEs in eNB coverage performs the direct communication. Sidelink radio bearer configuration parameter information to be used for the V2X packet transmission and reception based the unicast, the broadcast, or the groupcast between the UEs may be pre-configured. The UE which performs the direct communication may determine QoS information corresponding to the V2X service, arbitrarily set some configuration parameter of the sidelink radio bearer and acquire some configuration parameter from the pre-configured information.

The method for acquiring the sidelink QoS information and acquiring the sidelink radio bearer configuration parameter corresponding to the QoS in the direct communication between UEs may be used in the unicast V2X message transmission and reception, the broadcast V2X message transmission and reception, and the groupcast V2X message transmission and reception according to various embodiments of the disclosure. The sidelink radio bearer configuration parameter in the direct communication between UEs according to various embodiments of the disclosure may include at least one of a method for acquiring the parameter from the base station, a method for acquiring pre-configured information at the UE, and a method for arbitrarily configuring the parameter at the UE.

The QoS requirements of the V2X service according to the claimed invention are marked as a standardized 5QI value defined in 5GPP standard as shown in Table <NUM>. The UE and the base station in the direct communication system between UEs acquire the required QoS level of the V2X service based on the 5QI value.

The QoS parameter of the V2X service may include at least one of parameters of Table <NUM> in addition to the standardized 5QI of Table <NUM>.

According to various embodiments of the disclosure, the QoS information corresponding to each V2X service may be the standardized 5QI of Table <NUM> or add at least one parameter defined in Table <NUM> to the standardized 5QI. According to the claimed invention the QoS information includes the 5QI and range information indicating a minimum communication range. The QoS parameters of Table <NUM> and Table <NUM> are exchanged through Uu signaling between the base station and the UE and through sidelink signaling between the UEs.

In the disclosure, the QoS information corresponding to each V2X service is described as a V2X QoS index (VQI). The VQI in the disclosure may be set as follows.

In the embodiment of Table <NUM>, the VQI may be set identically to the 5QI value. The 5QI of Table <NUM> marks the parameters for the V2X with the standardized QoS index based on Table <NUM> and Table <NUM>.

In the embodiment of Table <NUM>, the VQI may be set independently from the standardized 5QI value. The 5QI of Table <NUM> marks the parameters for the V2X with the standardized QoS index based on Table <NUM> and Table <NUM>.

According to an embodiment of the disclosure, configuration information acquired by the UE for sidelink radio bearer (SLRB) configuration includes at least one of parameters of Table <NUM>. According to the claimed invention it includes information on a discard timer and information on a packet data convergence protocol, PDCP, sequence number, SN, size.

The parameters of Table <NUM> correspond to parameters configured by only a TX UE using the SLRB in the direct communication between UEs, parameters configured by a TX UE and a RX UE using the SLRB, and parameters configured by only a RX UE using the SLRB.

The parameters of Table <NUM> include a parameter for configuring the SLRB using the Uu signaling between the base station and the UE in the direct communication between UEs.

The parameters of Table <NUM> include a parameter for pre-configuring the SLRB in the UE in the direct communication between UEs.

The parameters of Table <NUM> include a parameter for configuring the SLRB using the sidelink signaling between the UEs in the direct communication between UEs.

The parameters of Table <NUM> include a parameter for configuring the SLRB using the Uu signaling between the base station and the UE to support a mode in which the base station directly schedules sidelink resources in the direct communication between UEs.

The parameters of Table <NUM> include a parameter for configuring the SLRB to support a mode in which the UE directly acquires sidelink resources in the direct communication between UEs.

The parameters of Table <NUM> include a configuration parameter for the SLRB which unicasts the direct communication between UEs.

The parameters of Table <NUM> include a configuration parameter for the SLRB which groupcasts the direct communication between UEs.

The parameters of Table <NUM> include a configuration parameter for the SLRB which broadcasts the direct communication between UEs.

According to an embodiment, mapping between the VQI of Table <NUM> and Table <NUM> and the SLRB configuration parameters of Table <NUM> is shown in Table <NUM>, Table <NUM>, and Table <NUM>.

Table <NUM> shows the SLRB configuration parameter values corresponding to the vQI index. The SLRB configuration parameter values of Table <NUM> are exemplary and may include at least one of the parameters of Table <NUM>.

Table <NUM> shows that the SLRB configuration including at least one of the SLRB configuration parameters of Table <NUM> with the index. The information of Table <NUM> may be pre-configured at the UE or received over the air (OTA) or via the base station. The information of Table <NUM> may be managed by the base station or a V2X server.

Table <NUM> is the embodiment in which the SLRB configuration parameters corresponding to the VQI index is marked with the index of Table <NUM>.

According to an embodiment of the disclosure, the QoS parameter for the V2X service not marked with the standardized QoS index for the QoS information of Table <NUM> through Table <NUM> may be acquired through the Uu signaling between the base station and the UE or through the sidelink signaling between the UEs.

Now, a method for setting the SLRB configuration based on the QoS information in the direct communication between UEs is explained by referring to <FIG>. The disclosure suggests two methods for the SLRB configuration based on the QoS information as follows.

Configuration method <NUM> (covered by the claimed invention): configured by the base station.

This method may be used if the UE is operated in RRC_Connected, RRC_Idle, or RRC_Inactive. The base station sets SLRB configuration information corresponding to the QoS information of the V2X service using RRC dedicated signaling (e.g., RRC connection reconfiguration) or a V2X SIB message to the terminal. This method is applicable if the direct communication between UEs is unicast, groupcast, or broadcast.

Configuration method <NUM> (not according to the claimed invention): configured by the UE.

This method may be used if the UE is operated in RRC_Connected, RRC_Inactive, or out of coverage. Default SLRB configuration corresponding to the QoS information of the V2X service may be set. Alternatively, the UE may arbitrarily set the SLRB configuration to correspond to the QoS information of the V2X service. Some SLRB configuration parameters require synchronization between the TX UE and the RX UE, and such parameters may be set to use default configuration. According to another embodiment, the SLRB configuration parameter requiring the synchronization between the TX UE and the RX UE may be set through signaling between the TX UE and the RX UE. This method is applicable if the direct communication between UEs is unicast, groupcast, or broadcast.

The second method may be also used in a system without the base station. However, as the advanced V2X use case is adopted and guaranteed SL resource allocation or guaranteed SL configuration is received from the base station with respect to a service which should guarantee a better communication service quality, it may be advantageous to use the first method.

The disclosure provides an SLRB configuration method corresponding to the QoS information according to the direct communication between UEs as follows.

If the base station sets the SLRB configuration, the base station may transmit the SLRB configuration to the TX UE.

According to an embodiment, the base station may transmit the SLRB configuration requiring the synchronization with the RX UE, to the RX UE through the Uu signaling. In so doing, the RX UE may transmit an SLRB configuration request (including at least one of unicast ID or QoS information/VQI) to the base station and receive the SLRB configuration from the base station. According to another embodiment, without a request of the RX UE, the base station may transmit the SLRB configuration for the RX UE.

According to yet another embodiment, the base station may transmit the SLRB configuration requiring the synchronization with the RX UE, to the RX UE via the TX UE. In so doing, the base station may indicate which parameter should be forwarded to the RX UE, to the TX UE. SLRB configuration signaling from the TX UE to the RX UE is a sidelink RRC message or a sidelink SIB message.

If the terminal sets the SLRB configuration, the TX UE may transmit the parameter requiring the synchronization to the RX UE according to an embodiment. The SLRB configuration signaling from the TX UE to the RX UE is a sidelink RRC message or a sidelink SIB message. According to another embodiment, the parameter requiring the synchronization between the TX UE and the RX UE may be set as the default configuration.

As for the SLRB configuration requiring the synchronization with the RX UE, the base station may transmit V2X SBI and thus notify the SLRB configuration corresponding to the VQI to be synchronized with the RX UE according to an embodiment. According to another embodiment, the TX UE may transmit a sidelink SIB message and thus notify the SLRB configuration corresponding to the VQI to be synchronized with the RX UE.

If the UE sets the SLRB configuration, the TX UE and the RX UE may use the default SLRB configuration corresponding to the VQI according to an embodiment. According to another embodiment, the TX UE may transmit a sidelink SIB message and thus notify the SLRB configuration corresponding to the VQI to be synchronized with the RX UE. A parameter not to be synchronized with the RX UE may be arbitrarily set and used by the TX UE.

At least one of (<NUM>) the unicast method or (<NUM>) the broadcast method may be used. Signaling the SLRB configuration from a group leader UE to a group member UE is a sidelink RRC message or a sidelink SIB message.

<FIG> illustrate signal flows of SLRB configuration for direct communication between UEs which are in RRC_CONNECTED according to various embodiments of the disclosure, and, in the case of <FIG>, of the claimed invention. In the embodiment of <FIG>, a UE1 may be assumed to be a TX UE, and a UE2 may be assumed to be a RX UE. The embodiment of <FIG> may be applied if a source terminal and a destination terminal are fixed in the unicast direct communication. The embodiment of <FIG> may be applied if a source terminal and a destination terminal of a group are fixed in the groupcast direct communication.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include VQI according to an embodiment of the disclosure. The UE1 transmits the VQI information of Table <NUM> through Table <NUM> to a base station and requests to set SLRB configuration via the base station in operation <NUM>. The UE1 transmits the VQI (according to the invention) or the unicast ID to the base station. The base station configures and transmits the SLRB configuration information of Table <NUM> through Table <NUM> to the UE1 for the sidelink unicast requested by the UE1 in operation <NUM>. In operation <NUM>, the base station may transmit sidelink resource allocation information (first mode setting or second mode setting) besides the SLRB configuration information used in the sidelink unicast. In operation <NUM>, the UE1 transmits the QoS information and the SLRB configuration information to use in the unicast corresponding to the unicast ID, to the UE1 corresponding to the destination terminal. In operation <NUM>, the UE1 and the UE2 perform V2X packet transmission and reception by applying SLRB configuration parameters to the unicast corresponding to the unicast ID.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include VQI according to an embodiment of the disclosure. The UE1 may transmit the VQI information of Table <NUM> through Table <NUM> to the base station and requests to set SLRB configuration via the base station in operation <NUM>. The UE1 may transmit the VQI or the unicast ID to the base station. The UE1 may transmit information indicating the source terminal to the base station. The base station may configure and transmit the SLRB configuration information of Table <NUM> through Table <NUM> to the UE1 for the sidelink unicast requested by the UE1 in operation <NUM>. In operation <NUM>, the base station may transmit sidelink resource allocation information (first mode setting or second mode setting) besides the SLRB configuration information used in the sidelink unicast. The UE2 corresponding to the destination terminal may transmit the VQI information of Table <NUM> through Table <NUM> and request to set the SLRB configuration via the base station in operation <NUM>. The UE2 may transmit the VQI or the unicast ID to the base station. The UE2 may transmit information indicating the destination terminal to the base station. In operation <NUM>, the base station may configure and transmit to the UE2 the SLRB configuration information of Table <NUM> through Table <NUM> for the sidelink unicast requested by the UE2. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters to the unicast corresponding to the unicast ID.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include the VQI according to an embodiment of the disclosure. The UE1 may transmit the VQI information of Table <NUM> through Table <NUM> to the base station and requests to set SLRB configuration via the base station in operation <NUM>. The UE1 may transmit the VQI or the unicast ID to the base station. The UE1 may transmit information indicating the source terminal to the base station. The base station may configure and transmit to the UE1 the SLRB configuration information of Table <NUM> through Table <NUM> for the sidelink unicast requested by the UE1 in operation <NUM>. In operation <NUM>, the base station may transmit sidelink resource allocation information (first mode setting or second mode setting) besides the SLRB configuration information used in the sidelink unicast. In operation <NUM>, the base station may transmit the SLRB configuration information to use in the sidelink unicast through a V2X SIB message. Information included in the V2X SIB message is the SLRB configuration information mapped to the VQI. The V2X SIB message of operation <NUM> is transmitted by the base station on a periodic basis or on an event basis, or on demand at a request of the UE separately from operation <NUM> and operation <NUM>. The UE2 corresponding to the destination terminal may acquire the SLRB configuration through the V2X SIB message transmitted from the base station in operation <NUM>. In so doing, the UE2 has the VQI information or the unicast ID to apply to the unicast, and may acquire the SLRB configuration information corresponding to the VQI from the V2X SIB message. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters to the unicast corresponding to the unicast ID.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include the VQI according to an embodiment of the disclosure. In operation <NUM>, the UE1 may set SLRB configuration corresponding to the QoS information of the unicast session. In operation <NUM>, the UE1 may determine SLRB configuration information which the destination terminal UE2 of the unicast session should know besides the configuration parameters which may be arbitrary selected and applied by the UE1. In operation <NUM>, the UE1 may transmit the SLRB configuration information for the UE2. For example, if determining the RLC mode of the configuration parameters of Table <NUM> through Table <NUM> to RLC AM, the RLC mode may be informed to the UE2. In operation <NUM>, the UE2 may set SLRB configuration corresponding to the QoS information of the unicast session. In operation <NUM>, the UE2 may determine the SLRB configuration information which the source terminal UE1 of the unicast session should know besides the configuration parameters which may be arbitrary selected and applied by the UE2. In operation <NUM>, the UE2 may transmit the SLRB configuration information for the UE1. For example, the UE2 may determine PDCP t-Reordering value from the configuration parameters of Table <NUM> through Table <NUM> and notify the PDCP t-Reordering value to the UE1. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying the SLRB configuration parameters to the unicast corresponding to the unicast ID.

It is noted that the embodiment of <FIG> is applied to the UE1 and the UE2 which are RRC_IDLE, RRC_INACTIVE, or out of coverage.

<FIG> illustrates signal flows of SLRB configuration for direct communication between UEs which are RRC_IDLE according to various embodiments not covered by the claimed invention.

The embodiment of <FIG> may be applied to the UE1 which is RRC_INACTIVE. In the embodiment of <FIG>, it may be assumed that the UE1 is the TX UE and the UE2 is the RX UE.

The embodiment of <FIG> may be applied to a case in which the source terminal and the destination terminal are fixed in the unicast direct communication. The embodiment of <FIG> may be applied to a case in which the source terminal and the destination terminal of a group are fixed in the groupcast direct communication.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include the VQI according to an embodiment of the disclosure and corresponds to Table <NUM> through Table <NUM>. The base station may transmit SLRB configuration information corresponding to the VQI to the UE1 and the UE2 using V2X SIB messages in operation <NUM> and operation <NUM>. The SLRB configuration information corresponds to Table <NUM> through Table <NUM>. In operations <NUM> and <NUM>, the UE1 and the UE2 may determine VQI corresponding to the unicast ID and acquire the SLRB configuration information corresponding to the VQI.

In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters to the unicast corresponding to the unicast ID.

<FIG> illustrates signal flows of SLRB configuration for direct communication between UEs which are out of coverage according to various embodiments not covered by the claimed invention. In the embodiment of <FIG>, it may be assumed that the UE1 is the TX UE and the UE2 is the RX UE.

Referring to <FIG>, the UE1 and the UE2 may set a unicast session for the direct communication between UEs. If setting the unicast session, the UE1 and the UE2 may exchange a unicast ID and QoS information of the corresponding unicast session. The QoS information may include the VQI according to an embodiment of the disclosure. In operations <NUM> and <NUM>, the UE1 and the UE2 may determine VQI corresponding to the unicast ID and acquire the SLRB configuration information corresponding to the VQI. In the embodiment of <FIG>, the UE1 and the UE2 may acquire the SLRB configuration information corresponding to the VQI from pre-configured configuration.

<FIG> illustrate signal flows of SLRB configuration for direct communication between UEs according to various embodiments of the disclosure, wherein, however, only parts of these embodiments conform to the claimed invention.

The embodiment of <FIG> may be applied to a UE which performs broadcast direct communication. The embodiment of <FIG> may be applied to a UE which performs groupcast direct communication.

Referring to <FIG>, the UE1 may transmit a SidelinkUEInformation message including QoS information to the base station. The QoS information may include the VQI according to an embodiment of the disclosure and corresponds to Table <NUM> through Table <NUM>. The base station may transmit a RRC Connection Reconfiguration message including SLRB configuration corresponding to the QoS information to the UE1 in operation <NUM>. In operation <NUM>, the UE1 may acquire the SLRB configuration corresponding to the QoS information from the RRC Connection Reconfiguration message received from the base station. In operation <NUM>, the base station may transmit the SLRB configuration corresponding to the QoS information using a V2X SIB message. In operation <NUM>, the UE2 may receive the V2X SIB message from the base station and acquire the SLRB configuration information corresponding to the QoS information. The SLRB configuration information transmitted by the base station in operations <NUM> and <NUM> corresponds to Table <NUM> through Table <NUM>. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters corresponding to the QoS information.

Referring to <FIG>, the UE1 may transmit a SidelinkUEInformation message including QoS information to the base station in operation <NUM>. The QoS information may include the VQI according to an embodiment of the disclosure and corresponds to Table <NUM> through Table <NUM>. The base station may transmit a RRC Connection Reconfiguration message including SLRB configuration corresponding to the QoS information to the UE1 in operation <NUM>. In operation <NUM>, the UE1 may acquire the SLRB configuration corresponding to the QoS information received from the base station. In operation <NUM>, the UE2 may acquire SLRB configuration according to pre-configured QoS information. The SLRB configuration in operations <NUM> through <NUM> corresponds to Table <NUM> through Table <NUM>. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters corresponding to the QoS information.

Referring to <FIG>, the UE1 and the UE2 may acquire SLRB configuration corresponding to pre-configured QoS information in operation <NUM> and operation <NUM>. The SLRB configuration corresponds to Table <NUM> through Table <NUM>. The QoS information may include the VQI according to an embodiment of the disclosure. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters corresponding to the QoS information.

Referring to <FIG>, the base station may transmit SLRB configuration information corresponding to QoS information through V2X SIB messages in operations <NUM> and <NUM>. The QoS information may include the VQI according to an embodiment of the disclosure and corresponds to Table <NUM> through Table <NUM>. The SLRB configuration information transmitted by the base station in operations <NUM> and <NUM> corresponds to Table <NUM> through Table <NUM>. The UE1 and the UE2 may receive the V2X SIB message from the base station and acquire the SLRB configuration corresponding to the QoS information in operation <NUM> and operation <NUM>. In operation <NUM>, the UE1 and the UE2 may perform V2X packet transmission and reception by applying SLRB configuration parameters corresponding to the QoS information.

<FIG>, and <FIG> illustrate signal flows of admission control for direct communication between UEs according to various embodiments not covered by the claimed invention.

A V2X system may provide the UE with V2X service information available in a corresponding system or information of whether a corresponding system may provide a particular V2X service. The corresponding system may not provide the V2X service because a protocol version supported by the V2X system and a protocol version supported by the UE are different, and the corresponding system may not provide the V2X service because sidelink radio resources or Uu link radio resources lack. The embodiment of the disclosure provides a method for notifying the UE of information indicating whether required SLRB configuration is provided to satisfy QoS information required by the V2X service of the UE. The UE may operate in RRC_CONNECTED, RRC_IDLE, or RRC_INACTIVE. If receiving the SLRB configuration for satisfying the QoS information required by the corresponding V2X service, the UE may receive the V2X service via the corresponding system. If not receiving the SLRB configuration for satisfying the QoS information required by the corresponding V2X service, the UE may not receive the V2X service via the corresponding system. Herein, the system may include a base station. In the latter case, the UE out of coverage may receive the corresponding V2X service by using pre-configured SLRB configuration or by directly setting the SLRB configuration.

The indication information for the system to notify the UE that the SLRB configuration for satisfying the QoS information required by the particular V2X service is available may be transmitted in a V2X SIB message according to an embodiment of the disclosure. The SLRB configuration availability indication information may be marked as follows.

Service availability indication (SLRB configuration indication, SLRB admission control indication).

The embodiment of <FIG> provides a method for managing the SLRB configuration according to the admission control.

Referring to <FIG>, the UE1 may receive a V2X SIB message including service availability indication from the base station in operation <NUM>. If the UE determines that the QoS information of the V2X service to be provided via the base station is supported according to the service availability indication of operation <NUM>, the UE1 may transmit a SidelinkUEInformation to the base station in operation <NUM>. The QoS information may include at least VQI and corresponds to Table <NUM> through Table <NUM>. The UE1 may receive SLRB configuration corresponding to the QoS information from the base station in operation <NUM>. The SLRB configuration corresponds to Table <NUM> through Table <NUM>.

If determining that the QoS information of the V2X service is not supported based on information of the V2X SIB message transmitted by the base station, the UE1 may use pre-configured SLRB configuration corresponding to the QoS information.

Referring to <FIG>, the UE in RRC_INACTIVE or RRC_IDLE may receive a V2X SIB message from the base station in operation <NUM>. The V2X SIB message may include service availability indication. If determining that the QoS information of the V2X service to be provided via the base station is supported according to the service availability indication of operation <NUM>, the UE1 may apply the SLRB configuration corresponding to the QoS information of the V2X SIB message. If determining that the QoS information of the V2X service is not supported based on the information of the V2X SIB message transmitted by the base station, the UE1 may use pre-configured SLRB configuration corresponding to the QoS information.

Referring to <FIG>, the UE may acquire QoS information provided by the system in operation <NUM>. In operation <NUM>, the UE may determine whether the system provides an intended V2X service, based on the information acquired in operation <NUM>. According to an embodiment of the disclosure, whether the system provides the intended V2X service corresponds to whether the system is able to set the SLRB configuration satisfying QoS requirements of the V2X service. If the V2X service is available from the system according to the determination of operation <NUM>, the UE acquires SLRB configuration from the system and receives the V2X service by applying the SLRB configuration in operation <NUM>. If the V2X service is not available from the system according to the determination of operation <NUM>, the UE acquires pre-configured SLRB configuration and receives the V2X service by applying the SLRB configuration in operation <NUM>.

<FIG> illustrates a scenario of SLRB configuration for groupcast direct communication between UEs according to various embodiments not encompassed by the wording of the claims.

Referring to <FIG>, in the groupcast direct communication between UEs, a UE which is a group member may perform a one-to-one unicast sidelink connection establishment procedure with other UE of a corresponding group. A group leader UE <NUM> may have sidelink RRC connection establishments <NUM>, <NUM>, and <NUM> with group member UEs <NUM>, <NUM>, and <NUM>.

The sidelink RRC connection establishment and connection release procedures may be identical to the unicast sidelink connection establishment and connection release procedures. The group may include a group leader and a group member, and the sidelink RRC connection establishment and connection release may be performed between the group leader and the group member. The sidelink RRC connection establishment and connection release of the groupcast may be performed between members. Management of the sidelink RRC link in the groupcast may be identical to unicast sidelink management. If the sidelink RRC connection is configured between the group leader and the group member, the sidelink RRC connection may be managed using a keep alive message between the group leader and the group member. If the sidelink RRC connection is configured between members of the group, the sidelink RRC connection may be managed using the keep alive message between the members.

In so doing, the sidelink unicast and the sidelink groupcast may differ in the following information.

The sidelink RRC for the groupcast may be used to configure or reconfigure the SLRB configuration corresponding to the QoS information to be used by the UE of the group. According to an embodiment of the disclosure, the SLRB configuration may be performed on each member in the sidelink RRC connection establishment for the groupcast between the members, or may be performed on every group member all at once after the sidelink RRC connection establishment for the groupcast between the members. The former method may be used if the group is dynamically formed (e.g., dynamic group start application : the group includes traffic lights installed at an intersection and a vehicle moving at corresponding traffic lights), and the latter method may be used if the group is pre-formed (e.g., platooning application).

<FIG>, and <FIG> illustrate signal flows of SLRB configuration for groupcast direct communication between UEs according to various embodiments not encompassed by the wording of the claims.

Referring to <FIG>, UE1, UE2, and UE3 belong to the same group. The UE1 may perform sidelink RRC connection establishment with the UE2 in operation <NUM>, and the UE1 may perform sidelink RRC connection establishment with the UE3 in operation <NUM>. If the sidelink RRC connection establishment between the member UEs are completed, sidelink RRC SLRB configuration including SLRB configuration to be used by the member UEs may be performed in the sidelink groupcast in operation <NUM>. In operation <NUM>, a group leader UE may transmit RRC Connection (re)Configuration and a group member UE may transmit RRC Connection (re)Configuration complete.

Referring to <FIG>, the UE1, the UE2, and the UE3 belong to the same group. The UE1 may perform sidelink RRC connection establishment with the UE2 in operation <NUM>. In operation <NUM>, the UE1 may perform sidelink RRC connection configuration including the SLRB configuration to be used by the member UEs, with the UE2. The UE1 may perform sidelink RRC connection establishment with the UE3 in operation <NUM>. In operation <NUM>, the UE1 may perform sidelink RRC connection configuration including the SLRB configuration to be used by the member UEs, with the UE3. In operations <NUM> and <NUM>, the group leader UE may transmit RRC Connection (re)Configuration and the group member UE may transmit RRC Connection (re)Configuration complete.

Referring to <FIG>, the UE1, the UE2, and the UE3 belong to the same group. The UE1 may perform sidelink RRC connection establishment with the UE2 and the UE3 in operation <NUM>. In operation <NUM>, the UE1 may perform sidelink RRC connection configuration including SLRB configuration to be used by the member UEs, with the UE2 and the UE3. In operations <NUM> and <NUM>, sidelink RRC signaling may be transmitted using group information, for example, group destination ID acquired in grouping the UE1, the UE2, and the UE3. The groupcast sidelink RRC (setting, release, management, SLRB configuration, SLRB reconfiguration) signaling may be transmitted using the group information according to the embodiment of <FIG>.

The information used to form the groupcast group may include at least one of group destination ID, group source ID, and QoS Info (VQI), and the QoS information corresponds to Table <NUM> through Table <NUM>.

According to an embodiment of the disclosure, a method for differentiating sidelink resource acquisition for sidelink RRC signaling and sidelink resource acquisition for sidelink data transmission is provided.

In the SLRB configuration for the sidelink resource acquisition, SL configuration and SL BSR configuration may be set with different priorities between the sidelink RRC signaling and the sidelink data. The sidelink RRC signaling is set to a logical channel group <NUM> and may use the configuration of the logical channel group <NUM> in the SL configuration and the SL BSR configuration. The sidelink data is set to other value than the logical channel group <NUM> and may use other configuration than the logical channel group <NUM> in the SL configuration and the SL BSR configuration.

As set forth above, an apparatus and a method according to various embodiments of the disclosure support a vehicle communication service requiring various QoSs using direct communication between UEs in a vehicle communication system, to thus achieve reliability and low-latency requirement in vehicle communication.

The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

For the software implementation, a computer-readable storage medium which stores one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors of an electronic device. One or more programs may include instructions for enabling the electronic device to execute the methods according to the embodiments described in the claims or the specification of the present disclosure.

Such a program (software module, software) may be stored to a random access memory, a non-volatile memory including a flash memory, a read only memory (ROM), an electrically erasable ROM (EEPROM), a magnetic disc storage device, a compact disc (CD)-ROM, digital versatile discs (DVDs) or other optical storage devices, and a magnetic cassette. Alternatively, the programs may be stored to a memory combining part or all of them. Also, a plurality of memories may be included.

Claim 1:
A method performed by a first user equipment, UE, in a wireless communication system, the method comprising:
transmitting (<NUM>), to a base station, BS, a sidelink, SL, UE information message including quality of service, QoS, information for a SL communication;
obtaining (<NUM>), from the BS, sidelink radio bearer, SLRB, configuration information;
transmitting (<NUM>), to a second UE via a radio resource control, RRC, signaling, an SLRB configuration for the SL communication; and
performing the SL communication with the second UE based on the SLRB configuration information,
wherein the QoS information for the SL communication includes a <NUM> QoS identifier, 5QI, value and range information indicating a minimum communication range, and
wherein the SLRB configuration information includes information on a discard timer and information on a packet data convergence protocol, PDCP, sequence number, SN, size.