CN113632568A

CN113632568A - Apparatus and method for sidelink resource configuration and allocation to facilitate direct communication in a wireless communication system

Info

Publication number: CN113632568A
Application number: CN202080024078.0A
Authority: CN
Inventors: 姜贤贞; A.阿吉瓦尔
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2019-03-26
Filing date: 2020-03-26
Publication date: 2021-11-09
Also published as: KR20200115100A

Abstract

The present disclosure relates to a communication method and system for merging a fifth generation (5G) communication system supporting higher data rates beyond fourth generation (4G) systems with internet of things (IoT) technology. The present disclosure may be applied to intelligent services based on 5G communication technologies and IoT related technologies, such as smart homes, smart buildings, smart cities, smart cars, networked cars, healthcare, digital education, smart retail, security and security services. A method of operating a terminal in a wireless communication system may include activating a sidelink mode-2 (d) and obtaining sidelink radio resource configuration information of other terminals, and transmitting the obtained sidelink radio resource configuration information to a target terminal. A method of operation of a terminal in a wireless communication system may include activating a sidelink mode-2 (d) and receiving sidelink radio resource configuration information from other terminals, and allocating a sidelink radio resource to a base station or the terminal itself using the received sidelink radio resource configuration information.

Description

Apparatus and method for sidelink resource configuration and allocation to facilitate direct communication in a wireless communication system

Technical Field

The present disclosure relates generally to wireless communication systems, and more particularly, to an apparatus and method for resource allocation required to support data transmission of a direct communication bearer in a wireless communication system.

Background

In order to meet the increasing demand for wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Accordingly, the 5G or pre-5G communication system is also referred to as a "super 4G network" or a "post-LTE system". The 5G communication system is considered to be implemented in a frequency band of higher frequencies (millimeter waves), for example, a 60GHz band, in order to achieve a higher data rate. In order to reduce propagation loss of radio waves and increase transmission distance, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, massive antenna techniques are discussed in the 5G communication system. Further, in the 5G communication system, development of system network improvement is being performed based on advanced small cells, cloud Radio Access Network (RAN), ultra dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multipoint (CoMP), reception-side interference cancellation, and the like. In 5G systems, hybrid FSK and QAM modulation (FQAM) and Sliding Window Superposition Coding (SWSC) have been developed 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 techniques.

The internet, which is a human-centric connected network in which humans generate and consume information, is now evolving towards the internet of things (IoT) in which distributed entities, such as things, exchange and process information without human intervention. Internet of everything (IoE) has emerged as a combination of IoT technology and big data processing technology through connection with a cloud server. As IoT implementations require technical elements such as "sensing technology," "wired/wireless communication and network infrastructure," "service interface technology," and "security technology," sensor networks, machine-to-machine (M2M) communication, Machine Type Communication (MTC), and the like have recently been studied.

Such an IoT environment can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between internet things. IoT can be applied in various fields including smart homes, smart buildings, smart cities, smart cars or networked cars, smart grids, healthcare, smart homes, and advanced medical services through the fusion and combination between existing Information Technology (IT) and various industrial applications.

In line with this, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, Machine Type Communication (MTC), and machine-to-machine (M2M) communication may be implemented through beamforming, MIMO, and array antennas. The application of cloud Radio Access Network (RAN) as the big data processing technology described above can also be considered as an example of the convergence of 5G technology and IoT technology.

In the 5G system, a radio interface scheme for providing a service having various quality of service (QoS) requirements has been discussed. For example, a vehicle-to-all (V2X) terminal direct communication scheme has been provided. In addition, various discussions are being made to shorten a communication time, increase reliability, and more efficiently support direct communication between terminals. Vehicle-to-all (V2X) is a generic term referring to all forms of communication that can be applied to road vehicles, and by combining with wireless communication technology, it is becoming available for a variety of additional services beyond the original safe-use scenario.

The above information is provided as background information only to aid in understanding the present disclosure. No determination is made as to whether any of the above is applicable as prior art with respect to the present disclosure, nor is an assertion made.

Disclosure of Invention

Technical problem

Based on the discussion as described above, the present disclosure provides a method for performing communication in a vehicle communication system in a direct communication system between terminals, and provides an apparatus and method for supporting vehicle communication service and data transmission that achieve high reliability and low latency requirements.

Technical subjects pursued in the present disclosure are not limited to the foregoing technical subjects, and other technical subjects not mentioned can be clearly understood by those skilled in the art to which the present disclosure pertains from the following description.

Solution to the problem

According to an embodiment of the present disclosure for solving the above problems, a method of a terminal in a wireless communication system may include: determining whether mode-2 (d) sidelink (sidelink) wireless communication has been configured based on at least one predetermined condition; determining whether a secondary terminal function has been activated if mode-2 (d) sidelink wireless communication has been configured; identifying at least one target terminal if the secondary terminal function has been activated; and receiving information regarding mode-2 (d) sidelink wireless communications from the identified target terminal.

Meanwhile, according to another embodiment of the present disclosure, a terminal in a wireless communication system may include a transceiver and a controller for controlling the transceiver to: determining whether mode-2 (d) sidelink wireless communication has been configured based on the transceiver and at least one predetermined condition; determining whether a secondary terminal function has been activated if mode 2- (d) sidelink wireless communication has been configured; identifying at least one target terminal if the secondary terminal function has been activated; and receiving information regarding mode-2 (d) sidelink wireless communications from the identified target terminal.

Advantageous effects of the invention

Apparatuses and methods according to various embodiments of the present disclosure provide a method capable of supporting a vehicle communication service requiring various qualities of service (QoS) using direct communication between terminals in a vehicle communication system, and provide a method of reducing a delay until direct communication resource acquisition and reducing uplink and downlink signaling by reducing uplink and downlink signaling required to acquire direct communication resources between a plurality of terminals and a base station, so that reliability and low latency requirements in vehicle communication can be achieved.

The effects obtained in the present disclosure are not limited to the above-described effects, and other effects not mentioned above can be clearly understood by those skilled in the art from the following description.

Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "associated with" and derivatives thereof can mean to include, be included within, interconnect with, contain, be contained within, connect to or connect with, couple to or couple with, communicate with, cooperate with, interleave, merge, approach, bind to or with, have properties of, etc.; and the term "controller" refers to any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

Further, the various functions described below may be implemented or supported by one or more computer programs, each computer program formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in suitable computer-readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as Read Only Memory (ROM), Random Access Memory (RAM), a hard disk drive, a Compact Disc (CD), a Digital Video Disc (DVD), or any other type of memory. A "non-transitory" computer-readable medium does not include a wired, wireless, optical, or other communication link that transmits transitory electrical or other signals. Non-transitory computer readable media include media in which data can be permanently stored and media in which data can be stored and later rewritten, such as rewritable optical disks or erasable memory devices.

Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numbers represent like parts:

fig. 1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure;

fig. 2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure;

fig. 3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure;

fig. 4A illustrates a configuration of a communicator in a wireless communication system, in accordance with various embodiments of the present disclosure;

fig. 4B illustrates a configuration of a communicator in a wireless communication system, in accordance with various embodiments of the present disclosure;

fig. 4C illustrates a configuration of a communicator in a wireless communication system, in accordance with various embodiments of the present disclosure;

fig. 5A illustrates a case in which direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure;

Fig. 5B illustrates a case in which direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure;

fig. 5C illustrates a case in which direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure;

fig. 5D illustrates a case where direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure;

fig. 6A illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, in accordance with various embodiments of the present disclosure;

fig. 6B illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, in accordance with various embodiments of the present disclosure;

fig. 6C illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, in accordance with various embodiments of the present disclosure;

fig. 7A illustrates the operation of a terminal triggering sidelink mode-2 (d) in accordance with various embodiments of the present disclosure;

fig. 7B illustrates the operation of a terminal triggering sidelink mode-2 (d) in accordance with various embodiments of the present disclosure;

fig. 8A illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d) according to various embodiments of the present disclosure;

Fig. 8B illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d) according to various embodiments of the present disclosure;

fig. 8C illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d), according to various embodiments of the present disclosure;

fig. 9A illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure;

fig. 9B illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure;

fig. 9C illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure;

fig. 9D illustrates a signaling process for obtaining information required for sidelink resource allocation in accordance with various embodiments of the present disclosure;

fig. 9E illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure;

fig. 10A illustrates a signaling process for configuring sidelink resource allocation information in accordance with various embodiments of the present disclosure; and is

Fig. 10B illustrates a signaling procedure for configuring sidelink resource allocation information, in accordance with various embodiments of the present disclosure.

Detailed Description

Fig. 1 through 10B, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Singular expressions may include plural expressions unless the terms are clearly different in context. Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. These terms, which are defined in commonly used dictionaries, can be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. In some cases, even terms defined in the present disclosure should not be construed to exclude embodiments of the present disclosure.

Hereinafter, various embodiments of the present disclosure will be described based on a hardware method. However, various embodiments of the present disclosure include techniques using both hardware and software, and thus, do not preclude a software perspective.

Hereinafter, the present disclosure relates to an apparatus and method for allocating and/or acquiring sidelink radio resources to support a vehicle-to-all (V2X) service in a wireless communication system using a direct communication protocol between terminals. In particular, the present disclosure explains a technique capable of satisfying QoS levels required for various V2X services based on an operation procedure of a terminal that assists in configuring a sidelink radio resource for sidelink direct communication between V2X terminals in a wireless communication system.

In the following description, terms related to signals, terms related to channels, terms related to control information, terms related to network entities, terms related to device elements, and the like are illustratively used for convenience. Accordingly, the present disclosure is not limited by the terms used below, and other terms related to the subject matter having an equivalent technical meaning may be used.

Also, for convenience of description, various embodiments of the present disclosure will be described using terms defined in a specific communication standard, for example, the third generation partnership project (3 GPP). However, the various embodiments are merely examples to explain the present disclosure, and the present disclosure may be easily modified and applied to other systems.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system may include: determining service information required for sidelink direct communication based on the mode-2 (d), determining a terminal capability capable of assisting sidelink direct communication based on the mode-2 (d), notifying a base station or another terminal of a capability of an auxiliary terminal for sidelink direct communication based on the mode-2 (d), searching for a terminal for assisting sidelink direct communication based on the mode-2 (d), obtaining auxiliary terminal information for sidelink direct communication based on the mode-2 (d), obtaining peripheral terminal information required for sidelink direct communication based on the mode-2 (d), transmitting information of the terminal required for sidelink direct communication based on the mode-2 (d) to the base station, obtaining resource information required for sidelink direct communication based on the mode-2 (d) from the base station, transmitting resource information required for sidelink direct communication based on the mode-2 (d) to an adjacent terminal, obtaining resource information required for the mode-2 (d) -based sidelink direct communication from the secondary terminal, requesting resource allocation from the base station from the obtained resource information required for the mode-2 (d) -based sidelink direct communication, and obtaining resources from the obtained resource information required for the mode-2 (d) -based sidelink direct communication.

According to various embodiments of the present disclosure, a terminal device in a wireless communication system may include a transceiver, and at least one processor functionally coupled with the transceiver. When it is determined that the terminal is the secondary terminal for the sidelink direct communication based on the mode-2 (d), the at least one processor may acquire information of another terminal that requires the sidelink direct communication based on the mode-2 (d), request resource information required for the sidelink direct communication of the another terminal from the base station, and acquire the resource information for the sidelink direct communication of the another terminal from the base station. When the terminal requires a sidelink direct communication based on the mode-2 (d) and is not an auxiliary terminal for the sidelink direct communication based on the mode-2 (d), the at least one processor may obtain auxiliary terminal information for the sidelink direct communication based on the mode-2 (d), transmit information required for the sidelink direct communication to the auxiliary terminal for the sidelink direct communication based on the mode-2 (d), and obtain resource information required for the sidelink direct communication through the auxiliary terminal.

A secondary terminal (secondary UE) may be used interchangeably with terms such as coordinating UE, scheduling UE, mode-2 (d) UE, relaying UE, and the like.

Hereinafter, various embodiments of the present disclosure will be described in detail.

Fig. 1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure.

Fig. 1 shows a base station 110, a terminal 1120, and a terminal 2130 as part of a node that uses a wireless channel in a wireless communication system. Although only one base station is shown in fig. 1, another base station that is the same as or similar to base station 110 may also be included. Although fig. 1 shows only two terminals, another terminal that is the same as or similar to terminal 1120 and terminal 2130 may also be included.

Base station 110 is the network infrastructure used to provide radio access to

terminals

120 and 130. Base station 110 has a coverage area defined as a particular geographic area based on the distance over which signals can be transmitted. The base station 110 may be referred to as an "Access Point (AP)", "enodeb (enb)", "fifth generation node (5G node)", "5 gnodeb (gnnb)", "wireless point", "transmission/reception point (TRP)", or another term having an equivalent technical meaning except for the base station.

Each of the terminal 1120 and the terminal 2130 is a device used by a user and performs communication with the base station 110 via a wireless channel. In some embodiments, at least one of terminal 1120 and terminal 2130 can operate without user involvement. That is, at least one of the terminal 1120 and the terminal 2130 is a device for performing Machine Type Communication (MTC) and may not be carried by a user. Each of the terminal 1120 and the terminal 2130 may be referred to as a "User Equipment (UE)", a "mobile station", a "subscriber station", a "remote terminal", a "wireless terminal" or a "user equipment" or another term with an equivalent technical meaning other than terminal.

Base station 110, terminal 1120, and terminal 2130 may transmit and receive wireless signals in a sub-6 MHz bandwidth and a millimeter wave (mmWave) bandwidth (e.g., 28GHz, 30GHz, 38GHz, 60 GHz). In this case, in order to improve channel gain, base station 110, terminal 1120, and terminal 2130 may perform beamforming. Here, the beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the terminal 1120, and the terminal 2130 may give directivity to transmit signals or receive signals. To this end, the base station 110, the terminal 1120, and the terminal 2130 may select the serving

beams

112, 113, 121, and 131 via a process of beam search or beam management. After the service beams 112, 113, 121, and 131 are selected, subsequent communications may be performed via resources in a quasi co-located (QCL) relationship with the resources transmitting the service beams 112, 113, 121, and 131.

The first antenna port and the second antenna port may be evaluated as being in a QCL relationship if the generalized characteristics (broadcharacteristics) of the channel carrying symbols on the first antenna port can be inferred from the channel carrying symbols on the second antenna port. For example, the generalized characteristics may include at least one of delay spread, doppler shift, average gain, average delay, and spatial receiver parameters.

Fig. 2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.

The configuration shown in fig. 2 can be understood as the configuration of the base station 110. The terms "component," "unit," and the like, as used herein, refer to a unit that processes at least one function or operation, and may be implemented in hardware or software or a combination of hardware and software.

Referring to fig. 2, the base station includes a wireless communicator 210, a backhaul communicator 220, a storage 230, and a controller 240.

The wireless communicator 210 performs a function for transmitting and receiving signals via a wireless channel. For example, the wireless communicator 210 performs conversion between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the wireless communicator 210 generates complex symbols by encoding and modulating a transmission bit stream. Further, when receiving data, the wireless communicator 210 restores a received bit stream by demodulating and decoding a baseband signal.

The wireless communicator 210 up-converts a baseband signal into a Radio Frequency (RF) band signal to transmit a signal through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal. To this end, the wireless communicator 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. The wireless communicator 210 may include a plurality of transmit and receive paths. Further, the wireless communicator 210 may include at least one antenna array comprised of a plurality of antenna elements.

In terms of hardware, the wireless communicator 210 may be composed of a digital unit and an analog unit, and the analog unit may include a plurality of sub-units according to an operation power, an operation frequency, and the like. The digital unit may be implemented as at least one processor, such as a Digital Signal Processor (DSP).

The wireless communicator 210 transmits and receives signals as described above. Accordingly, all or a portion of the wireless communicator 210 may be referred to as a "transmitter," receiver, "or" transceiver. Further, in the following description, transmission and reception performed via a wireless channel are used to mean that the process described above is performed by the wireless communicator 210.

Backhaul communicator 220 provides an interface for performing communications with other nodes in the network. That is, the backhaul communicator 220 converts a bitstream transmitted from a base station to other nodes (e.g., another access node, another base station, an upper node, a core network, etc.) into a physical signal and converts a physical signal received from the other nodes into a bitstream.

The storage 230 stores data such as basic programs, application programs, configuration information for the operation of the base station. The storage 230 may be comprised of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. The storage device 230 provides stored data according to a request of the controller 240.

The controller 240 controls the overall operation of the base station. For example, the controller 240 sends and receives signals through the wireless communicator 210 or through the backhaul communicator 220. Further, the controller 240 records data in the storage device 230 and reads out the data. The controller 240 may perform the functions of a protocol stack required by a communication standard. According to another embodiment, the protocol stack may be included in the wireless communicator 210. To this end, the controller 240 may include at least one processor.

According to various embodiments, the controller 240 may transmit radio resource control configuration information to the

terminals

120 and 130. The controller 240 may transmit the sidelink configuration information to the

terminals

120 and 130. For example, the controller 240 may control the base station to perform operations according to various embodiments described below.

Fig. 3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.

The configuration shown in fig. 3 may be understood as a configuration of the terminal 1120 or the terminal 2130. The terms "component," "unit," and the like, as used herein, refer to a unit that processes at least one function or operation, and may be implemented in hardware or software or a combination of hardware and software.

Referring to fig. 3, the terminal includes a communicator 310, a storage 320, and a controller 330.

The communicator 310 performs a function for transmitting and receiving a signal via a wireless channel. For example, the communicator 310 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the communicator 310 generates complex symbols by encoding and modulating a transmission bit stream. Further, when receiving data, the communicator 310 restores a received bit stream by demodulating and decoding a baseband signal. The communicator 310 up-converts a baseband signal into an RF band signal to transmit a signal through an antenna, and down-converts an RF band signal received through the antenna into a baseband signal. For example, communicator 310 may include transmit filters, receive filters, amplifiers, mixers, oscillators, DACs, ADCs, and the like.

Communicator 310 may include multiple transmit and receive paths. Further, the communicator 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, communicator 310 may be comprised of digital circuitry and analog circuitry (e.g., a Radio Frequency Integrated Circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. Further, communicator 310 may include multiple RF chains. Further, the communicator 310 may perform beamforming.

Communicator 310 may include different communication modules to process signals of different frequency bands. Further, the communicator 310 may include a plurality of communication modules to support a plurality of different radio access technologies. For example, the different radio access technologies may include Bluetooth Low Energy (BLE), wireless fidelity (Wi-Fi), Wi-Fi gigabytes (WiGig), cellular networks (e.g., Long Term Evolution (LTE)), and so on. Further, the different frequency bands may include an ultra high frequency (SHF) (e.g., 2.5GHz, 3.5GHz, 5GHz) band and a millimeter (mm) wave (e.g., 60GHz) band.

Communicator 310 transmits and receives signals as described above. Accordingly, all or a portion of the communicator 310 may be referred to as a "transmitter," receiver, "or" transceiver. Further, in the following description, transmission and reception performed via a wireless channel are used to indicate that the above-described processing is performed by the communicator 310.

The storage 320 stores data such as basic programs, application programs, configuration information for the operation of the terminal. The storage 320 may be comprised of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. The storage device 320 provides stored data according to a request of the controller 330.

The controller 330 controls the overall operation of the terminal. For example, the controller 330 transmits and receives signals through the communicator 310. Further, the controller 330 records data in the storage device 320 and reads out the data. The controller 330 may perform the functions of a protocol stack required by a communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be part of a processor. Further, the communicator 310 and a portion of the controller 330 may be referred to as a Communication Processor (CP).

According to various embodiments, the controller 330 may perform a process of determining that the

terminals

120 and 130 activate a function for assisting the radio resource configuration of the other terminal for performing the sidelink direct communication, a process of notifying the other terminal and the base station 110 of a support capability for the function for assisting the radio resource configuration, a process of acquiring information of the other terminal to acquire the sidelink radio resource information using the radio resource configuration support function of the

terminals

120 and 130, a process of providing the acquired information to the base station 110, a process of receiving the sidelink radio resource information of the other terminal from the base station 110, and a process of transmitting the received sidelink radio resource information to the other terminal. For example, the controller 330 may control the terminal to perform operations according to various embodiments described below.

Fig. 4A illustrates a configuration of a communicator in a wireless communication system according to various embodiments of the present disclosure, fig. 4B illustrates a configuration of a communicator in a wireless communication system according to various embodiments, and fig. 4C illustrates a configuration of a communicator in a wireless communication system according to various embodiments.

Fig. 4A to 4C show examples of detailed configurations of the wireless communicator 210 of fig. 2 or the communicator 310 of fig. 3. In particular, fig. 4A-4C illustrate components for performing beamforming as part of the wireless communicator 210 of fig. 2 or the communicator 310 of fig. 3.

Referring to fig. 4A, wireless communicator 210 or communicator 310 includes a coding and modulation unit 402, a digital beamforming unit 404, a plurality of transmit paths 406-1 to 406-N, and an analog beamforming unit 408.

The coding and modulation unit 402 performs channel coding. For channel coding, at least one of a Low Density Parity Check (LDPC) code, a convolutional code, and a polar code. The coding and modulation unit 402 generates modulation symbols by performing constellation mapping.

The digital beamforming unit 404 performs beamforming on the digital signal (e.g., modulation symbol). To this end, the digital beamforming unit 404 multiplies the modulation symbols by beamforming weights. Here, the beamforming weights are used to change the amplitude and phase of the signals, and may be referred to as a "precoding matrix", "precoder", or the like. Digital beamforming unit 404 outputs digitally beamformed modulation symbols via a plurality of transmit paths 406-1 through 406-N. In this embodiment, modulation symbols may be multiplexed or the same modulation symbol may be provided to multiple transmit paths 406-1 to 406-N according to a multiple-input multiple-output (MIMO) transmission scheme.

The multiple transmit paths 406-1 to 406-N convert the digital beamformed digital signals to analog signals. To this end, each of the plurality of transmit paths 406-1 through 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 an Orthogonal Frequency Division Multiplexing (OFDM) scheme and may be excluded when another physical layer scheme (e.g., filter bank multi-carrier (FBMC)) is applied. That is, the multiple transmit paths 406-1 to 406-N provide independent signal processing for multiple streams generated via digital beamforming. However, depending on the implementation, some of the components of the multiple transmit paths 406-1 through 406-N may be used in common.

The analog beamforming unit 408 performs beamforming on the analog signal. To this end, the digital beamforming unit 404 multiplies the analog signal by beamforming weights. Here, the beamforming weights are used to change the amplitude and phase of the signal. Specifically, the analog beamforming unit 408 may be configured as shown in fig. 4B or 4C according to a connection structure between the plurality of transmission paths 406-1 to 406-N and the antenna.

Referring to fig. 4B, a signal input to the analog beamforming unit 408 is transmitted through an antenna through a phase/amplitude conversion and amplification operation. At this time, the signals of each path are transmitted through different antenna sets (i.e., antenna arrays). Observing the processing of the signal input via the first path, the signal is converted into a signal sequence having different or the same phase/amplitude by the phase/amplitude converters 412-1 to 412-1-M, amplified by the amplifiers 414-1 to 414-1-M, and then transmitted through the antenna.

Referring to fig. 4C, a signal input to the analog beamforming unit 408 is transmitted through an antenna through a phase/amplitude conversion and amplification operation. At this time, the signals of each path are transmitted through the same antenna set (i.e., antenna array). Observing the processing of the signal input through the first path, the signal is converted into a sequence of signals having different or the same phase/amplitude by the phase/amplitude converters 412-1-1 to 412-1-M and amplified by the amplifiers 414-1-1 to 414-1-M. The amplified signals are then summed by summing units 416-1-1 to 416-1-M based on the antenna elements to be transmitted through an antenna array and then transmitted through the antennas.

Fig. 4B shows an example of using separate antenna arrays for each transmit path, and fig. 4C shows an example of sharing one antenna array for the transmit paths. However, according to another embodiment, some transmit paths may use separate antenna arrays and other transmit paths may share one antenna array. Further, according to another embodiment, by applying a switchable structure between a transmission path and an antenna array, a structure that can be adaptively changed according to circumstances may be used.

The V2X service can be divided into a basic security service and a high-level service. The basic safety service may include detailed services such as a vehicle notification (CAM or BSM) service, a left turn notification service, a preceding vehicle collision warning service, an emergency vehicle entrance notification service, a preceding obstacle warning service, an intersection signal information service, and the like, and may transmit and receive the V2X information using a broadcast or unicast or multicast transmission method. Not only does the advanced service have an enhanced QoS requirement than the basic security service, but the advanced service also requires a method of transmitting and receiving V2X information by using a unicast and multicast transmission method in addition to a broadcast transmission method to transmit and receive V2X information within a specific vehicle group or V2X information between two vehicles. Advanced services may be detailed services such as cluster driving services, automated driving services, remote driving services, and extended sensor-based V2X services.

For V2X service, a terminal (UE) in ng-RAN (gnb) connected to a 5G core network or E-UTRAN (ng-eNB) connected to a 5G core network may perform V2X service via the ng-RAN or E-UTRAN. As another example, V2X service may be performed by a base station (ng-RAN or ng-eNB) when the base station is connected to an Evolved Packet Core (EPC). As another embodiment, when the base station is connected to the evolved packet core network, the V2X service may be performed by the base station. At this time, the V2X wireless interface communication method available for direct communication between terminals is at least one of unicast, multicast, and broadcast, and when V2X transmission and reception are performed in each communication method, a way of managing and configuring wireless communication parameters suitable for QoS requirements of the V2X service can be provided.

A system for performing direct communication between terminals based on LTE wireless communication defines parameters required for a transmitting terminal itself to select and operate transmission. On the basis of LTE wireless communication, V2X service messages for basic security are transmitted through a direct communication method between terminals. The QoS requirements of the basic security V2X service are not strict, and even if the basic security services are diverse, the QoS requirements between services do not change, and the differentiation between services is not large. Therefore, even in a mode in which the base station schedules radio resources for direct communication between terminals, the base station does not need to acquire QoS requirement information of the V2X service in detail and schedules the radio resources and operates at a level at which the terminals arbitrarily manage and configure parameters, based on LTE wireless communication.

Advanced V2X services have various QoS requirements, and the level of QoS required for each V2X service varies widely. In embodiments of a particular advanced V2X service, the radio resources and radio parameters used for direct communication may be configured to meet the strict QoS requirements of the service before the service can operate. Accordingly, the system based on direct communication between terminals supporting the advanced V2X service can provide a method of guaranteeing QoS of the service, compared to the conventional system.

According to various embodiments of the present disclosure, a method of obtaining sidelink radio resource information for direct communication between vehicles required to perform basic safety services or advanced services will be described.

Fig. 5A illustrates a case in which direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure. Fig. 5B illustrates a case where direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments, and fig. 5C illustrates a case where direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure. Fig. 5D illustrates a case in which direct communication between terminals is performed by using a side link Radio Access Technology (RAT) according to various embodiments of the present disclosure.

Fig. 5A illustrates a scenario in which a terminal under the coverage of the gbb performs direct communication. In fig. 5A, resource allocation configuration parameter information to be used for transmitting and receiving side-link radio bearers of unicast, broadcast or multicast-based V2X packets between terminals may be transmitted to the

terminals

120 and 130 via a system information message or an RRC dedicated message of the gNB 110, or may be pre-configured in the

terminals

120 and 130.

Terminals

120 and 130 performing direct communication may send sidelink resource allocation request information required for V2X service packet transmission to the gNB 110 and obtain sidelink resource allocation and/or configuration information from the gNB 110. Side link resource allocation request information for side link resource allocation and/or configuration information may be transmitted via a terminal for secondary radio resource configuration.

Fig. 5B shows a scenario where

terminals

120 and 130 under the coverage of ng-eNB perform direct communication. In fig. 5B, configuration parameter information to be used for a sidelink radio bearer for transmitting and receiving a unicast, multicast or broadcast-based V2X packet between terminals may be transmitted to the

terminals

120 and 130 via a system information message or an RRC dedicated message of the ng-eNB 110, or may be pre-configured in the

terminals

120 and 130.

Terminals

120 and 130 performing direct communication may send sidelink resource allocation request information required for V2X service packet transmission to ng-eNB 110 and obtain sidelink resource allocation and/or configuration information from ng-eNB 110. Side link resource allocation request information for side link resource allocation and/or configuration information may be transmitted via a terminal for secondary radio resource configuration.

Fig. 5C shows a scenario in which the terminal 120 under the coverage of the gNB and the terminal 130 under the coverage of the eNB perform direct communication. In fig. 5C, configuration parameter information to be used for transmitting and receiving side-link radio bearers of unicast, multicast or broadcast-based V2X packets between terminals may be transmitted to the

terminals

120 and 130 via a system information message or RRC dedicated message of the gNB 110, or may be pre-configured in the

terminals

120 and 130.

Terminals

Fig. 5D shows a scenario in which

terminals

120 and 130 under the coverage of the eNB perform direct communication. Configuration parameter information to be used for a sidelink radio bearer for transmitting and receiving a unicast, multicast or broadcast-based V2X packet between terminals may be transmitted to the

terminals

120 and 130 via a system information message or an RRC dedicated message of the eNB 110, or may be pre-configured in the

terminals

120 and 130.

Terminals

120 and 130 performing direct communication may send sidelink resource allocation request information required for V2X service packet transmission to eNB 110 and obtain sidelink resource allocation and/or configuration information from eNB 110. Side link resource allocation request information for side link resource allocation and/or configuration information may be transmitted via a terminal for secondary radio resource configuration.

According to various embodiments of the present disclosure, a sidelink radio resource transmitted by a terminal that assists a sidelink radio resource configured for direct communication between terminals may be used to transmit/receive a V2X message of a unicast method, a V2X message of a transmission/reception broadcast method, or a V2X message of a transmission/reception multicast method.

Next, a scenario in which the sidelink pattern 2(d) is operated in the sidelink resource allocation method required for the direct communication between the terminals will be described with reference to fig. 6A to 6C.

Fig. 6A illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, according to various embodiments of the present disclosure. Fig. 6B illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, according to various embodiments of the present disclosure. Fig. 6C illustrates a scenario of mode 2(d) of an operational side link resource allocation scheme, according to various embodiments of the present disclosure.

For example, various embodiments of the present disclosure are described in the context of a terminal being within the coverage of a base station and the terminal being in an RRC connected mode, but may also be applied when the terminal is in an RRC idle mode or an RRC connection deactivated mode or out of coverage.

The sidelink pattern-2 (d) corresponds to a resource allocation method which can obtain sidelink resource information of the terminal a supporting direct communication between terminals through the terminal B supporting direct communication between terminals. The resource information may correspond to a resource pool or resource allocation configuration information required for the terminal a to request the sidelink resource from the base station, and the resource information is allocated from the base station. The resource information may correspond to resource pool or resource allocation configuration information required for the terminal a to directly select the sidelink resource. The resource information may correspond to sidelink resources allocated by the base station.

Upon receiving the resource pool or the resource allocation configuration information, terminal a may perform a procedure for receiving a sidelink resource to be actually used by the base station, and terminal a may perform direct communication with another terminal based on the allocated resource. Upon receiving the resource pool or resource allocation configuration information, terminal a may select a resource by itself (e.g., based on sensing or random selection) and perform direct communication with another terminal on the selected resource. Information indicating whether terminal a uses a mode of allocating sidelink resources from the base station or uses a mode of allocating sidelink resources by itself may be included in the resource pool or resource allocation configuration information received by terminal B. Terminal B may correspond to a secondary terminal performing an operation for obtaining resource information from a base station for terminal a. Terminal a may be referred to as a target terminal.

Fig. 6A illustrates an embodiment of a fleet of vehicles. A fleet may be an embodiment of the static group communication of the present disclosure. A fleet of vehicles according to various embodiments of the present disclosure may be performed by vehicle terminals by forming groups to perform direct communication between the terminals. The group may include a leader terminal 600 and member terminals 610. When the group leader terminal 600 and the member terminals 610 are within the coverage of the base station 620, the group leader terminal 600 and the member terminals 610 may obtain side link radio configuration information for performing direct communication between the terminals in the group from the base station 620.

According to embodiments of the disclosure, the group leader terminal 600 may act as a secondary terminal for acquiring side link resource information for the member terminals 610 from the base station 620. The member terminal 610 may transmit and receive data using the sidelink radio resource allocated by the base station 620 based on the sidelink resource information received through the group leader terminal 600, transmit and receive data through the allocated resource by performing a procedure of allocating the sidelink radio resource with the base station 620, or transmit and receive data through the allocated resource by selecting the sidelink radio resource by itself. The base station 620 may perform a configuration information exchange procedure with the group leader terminal 600 to configure the side link radio resource information to be used by the member terminals 610.

Referring to fig. 6B, an embodiment in which a vehicle, infrastructure, pedestrian terminal, or the like performs group communication in an intersection area is illustrated. Intersection group communication may be an embodiment of dynamic group communication. According to various embodiments of the present disclosure, a vehicle terminal, a pedestrian terminal, and an infrastructure terminal may form a group to perform direct communication between the terminals. The group may include a leader terminal 640 and member terminals 650. In the embodiment of the present disclosure, the infrastructure terminal installed at the intersection may be the group leader terminal 640, and the vehicle terminal and the pedestrian terminal located at the intersection may be the member terminals 650. When the group leader terminal 640 and the member terminals 650 are within the coverage of the base station 620, the group leader terminal 640 and the member terminals 650 may obtain side link radio configuration information from the base station 620 for performing direct communication between the terminals in the group.

According to an embodiment of the disclosure, the group leader terminal 640 may act as a secondary terminal for the member terminals 650 to obtain side link resource information from the base station 620. The member terminal 650 may transmit and receive data using the sidelink radio resource allocated by the base station 620 based on the sidelink resource information received through the group leader terminal 640, transmit and receive data through the allocated resource by performing a procedure of allocating the sidelink radio resource with the base station 620, or transmit and receive data through the allocated resource by selecting the sidelink radio resource by itself. The base station 620 may perform a configuration information exchange procedure with the group leader terminal 640 to configure the side link radio resource information to be used by the member terminal 650.

Referring to fig. 6C, a configuration for obtaining sidelink radio resource information between a base station 620, a UE 1660, and a UE 2670 is shown, in accordance with various embodiments of the present disclosure. The base station 620, UE 1660, and UE 2670 may exchange control signals and data over the Uu interfaces 682 and 684, respectively. The UE 1660 and the UE 2670 may exchange control signals and data via the sidelink interface 680. According to embodiments of the present disclosure, the UE 1660 may perform functions that assist the sidelink radio resource configuration of the UE 2670. The UE 1660 may request the sidelink radio resource configuration information of the UE 2670 from the base station 620 and obtain the sidelink radio resource configuration information of the UE 2670 from the base station 620 to send to the UE 2670.

According to various embodiments of the present disclosure, a terminal (hereinafter, referred to as a secondary terminal) supporting a sidelink radio resource configuration secondary terminal function may be designated in advance by a V2X server or a V2X administrator. For example, the fleet leader terminal 600 of fig. 6A or the infrastructure terminal 640 installed at the intersection of fig. 6B may be configured to have the function of an auxiliary terminal.

According to an embodiment of the present disclosure, the terminal may determine whether mode-2 (d) sidelink wireless communication is configured. For example, the terminal may determine that mode-2 (d) sidelink wireless communication is established in at least one of the following cases: wherein if the terminal is located in a mode-2 (d) enabled zone (associating zone), if an application related to the mode-2 (d) sidelink wireless communication is operated, if resource information of the mode-2 (d) sidelink wireless communication is received from the base station.

An example of a condition for activating the secondary terminal function may be that the V2X function is always activated when activated. For example, by satisfying the above condition, it is determined that the mode-2 (d) side link wireless communication is configured for the terminal. Accordingly, when the V2X function is activated, the auxiliary terminal function of the terminal may be activated.

Other embodiments of the condition for activating the secondary terminal function may include at least one of: (1) when located in the mode-2 (d) enabled region; (2) when the V2X application of interest for mode-2 (d) is run; and (3) when both of the conditions (1) and (2) are satisfied. The mode-2 (d) enabled area information may be indicated by at least one of information previously configured in the V2X server, the base station, and the terminal.

According to an embodiment, the enabled area configuration information may be transferred to the terminal and preconfigured via NW configured (RRC dedicated or system information).

As another example, the enabled region may be configured to be activated for SL bearers, SL streams, or SL applications.

In case of a specific SL bearer, the enabled region may be operated. Further, the enabling area configuration information may be included in the SL bearer configuration information.

In an operation in which the terminal handles the SL bearer configuration and the enable area configuration, when the configuration is obtained, the terminal activates the secondary terminal function for the corresponding SL bearer, for example, when the configuration is obtained, the terminal may activate the mode-2 (d) function for the corresponding SL bearer.

Meanwhile, the enable region may be operated for a specific SL stream. For example, the enable area configuration information may be included in the SL stream configuration information. In the operation in which the terminal handles the SL configuration and the enable region configuration, the terminal activates the auxiliary terminal function for the corresponding SL stream when the configuration is obtained, for example, the terminal may activate the mode-2 (d) function for the corresponding SL stream when the configuration is obtained.

Alternatively, the enabled area may operate for a specific application.

The application and enabling area configuration mapping information may be transferred to an AS layer in an upper layer (V2X layer or upper layer) of the terminal. The secondary terminal function activation for the application is AS shown in the example of table 1, and the secondary terminal function activation configuration information based on table 1 may be transferred to the AS layer. In the operation in which the terminal processes the SL configuration and the enable area configuration, the terminal activates the secondary terminal function for the corresponding SL application when the configuration is obtained, for example, the terminal activates the mode-2 (d) function for the corresponding SL application when the configuration is obtained. Examples of the information indicating the SL application in the AS layer may include at least one of a destination identifier or a source identifier corresponding to the SL application.

The mode-2 (d) enabled area may be, for example, the fleet of fig. 6A or the intersection of fig. 6B. Mode-2 (d) enabled areas may operate while the fleet is running (e.g., from departure to arrival). Mode-2 (d) the enabled area can be operated for intersections of a specific area. The secondary terminal may activate the secondary terminal function when the secondary terminal is located in the mode-2 (d) enabled area.

Mode-2 (d) the V2X application of interest may be indicated by the V2X server or pre-configured in the terminal. Table 1 shows a list of applications corresponding to mode-2 (d) interests.

[ Table 1] application List and Pattern-2 (d) interest

The determination of the application of V2X interested in mode-2 (d) may be performed in an upper layer of the secondary terminal. According to the example of table 1, the terminal may determine that it is not necessary to support mode-2 (d) for the grouping of App _ a and may not activate the secondary terminal function. The terminal may determine that the grouping of App _ B through App _ C may support mode-2 (d) and activate secondary terminal functions.

According to various embodiments of the present disclosure, a terminal (hereinafter, referred to as a target terminal) supporting a function of a reception-side link radio resource configuration may be previously designated by a V2X server or a V2X administrator. For example, the fleet member terminal 610 of fig. 6A or the vehicle terminal or pedestrian terminal 650 located at the intersection of fig. 6B may be configured to have the functionality of a target terminal. According to an embodiment of the present disclosure, when the V2X function is activated, the target terminal functions may be activated together. Other embodiments of the condition that the target terminal function is activated may include at least one of: (1) when located in the mode-2 (d) enabled region; (2) when the V2X application of interest for mode-2 (d) is run; and (3) when both of the conditions (1) and (2) are satisfied. The mode-2 (d) enabled area may be, for example, the fleet of fig. 6A or the intersection of fig. 6B. The target terminal may activate the target terminal function when located in the mode-2 (d) enabled area. Mode for activating target terminal function-2 (d) V2X application of interest may be indicated by the V2X server or pre-configured in the terminal, as shown in table 1. The upper layers of the target terminal may refer to table 1 to determine the V2X application of interest for mode-2 (d).

The method for determining whether the secondary terminal or the target terminal is located in the mode-2 (d) enabled area may include at least one of the following or a combination of the following: (1) determined by comparing location coordinates of the terminal based on GNSS or GPS mode-2 (d) enabled area information indicated by or set in the terminal by the base station; (2) mode-2 (d) enabled region indicator transmitted by a base station; and (3) a mode-2 (d) enabled region indicator transmitted by the secondary terminal.

The zone configuration information that the secondary terminal or the target terminal may use to determine the mode-2 (d) enabled zone may include contents as shown in table 2 below. For example, the terminal may receive the area configuration information as shown in table 2 below from the base station.

[ TABLE 2] area configuration information

The secondary terminal or the target terminal may calculate the area ID as follows based on the area configuration information as shown in table 3 below.

[ Table 3] region ID

As an example, the target terminal may determine whether the zone ID of the terminal is included in a mode-2 (d) zone ID list transmitted by the base station to determine whether a mode-2 (d) -enabled zone exists.

As an example, the target terminal may determine whether the area ID is the mode-2 (d) enabled area by determining whether the area ID of the target terminal is included in a mode-2 (d) area ID list transmitted by the base station or the secondary terminal.

As another embodiment, the secondary terminal may determine whether the zone ID is a mode-2 (d) enabled zone by determining whether a mode-2 (d) enabled zone indicator is included in signaling transmitted by the base station.

As another embodiment, the target terminal may determine whether the zone ID is a mode-2 (d) enabled zone by determining whether a mode-2 (d) enabled zone indicator is included in signaling transmitted by the base station or the secondary terminal.

As another embodiment, the secondary terminal may determine whether the area ID is a mode-2 (d) enabled area by determining whether a mode-2 (d) enabled area indicator is configured to be enabled or disabled in signaling transmitted by the base station.

As another embodiment, the target terminal may determine whether the area ID is a mode-2 (d) enabled area by determining whether a mode-2 (d) enabled area indicator is configured to be enabled or disabled in signaling transmitted by the base station or the secondary terminal.

According to various embodiments, when the mode-2 (d) function is activated, the secondary terminal 660 may transmit capability information regarding the mode-2 (d) function to the base station 620 through the Uu interface 682.

When the base station 620 does not transmit the mode-2 (d) enabled area indicator, the base station 620 may transmit the mode-2 (d) enabled area indicator when the base station 620 determines that the secondary terminal 660 having the capability of the mode-2 (d) function exists. When the mode-2 (d) function is activated, the secondary terminal 660 may transmit mode-2 (d) function indication information and/or a mode-2 (d) enabled area indicator to the target terminal 670 via the sidelink interface 680. An embodiment of a process of transmitting and receiving the mode-2 (d) function indication information and/or the mode-2 (d) enable area indicator through the sidelink interface 680 will be described with reference to fig. 8A to 8C. When the mode-2 (d) function is activated, the secondary terminal 660 may determine whether to establish the PC5 RRC unicast connection with the target terminal 670, and if the target terminal 670 and the PC5 RRC unicast connection are not established, the secondary terminal 660 may perform the PC5 RRC unicast connection configuration procedure.

According to various embodiments of the present disclosure, when the mode-2 (d) function is activated, the target terminal 670 may transmit capability information regarding the mode-2 (d) function to the base station 620 through the Uu interface 684. The upper layers (e.g., V2X layer, application layer) of the target terminal 670 may instruct the AS layer to activate mode-2 (d) functionality. When the mode-2 (d) function is activated, the target terminal 670 may determine whether to establish a PC5 RRC unicast connection with the secondary terminal 660, and when the secondary terminal 660 and the PC5 RRC unicast connection are not established, the target terminal 670 may perform a PC5 RRC unicast connection configuration procedure.

Fig. 7A illustrates the operation of a terminal triggering sidelink mode-2 (d) according to various embodiments of the present disclosure. Fig. 7B illustrates the operation of a terminal triggering sidelink mode-2 (d) according to various embodiments of the present disclosure.

Referring to fig. 7A, the terminal may determine whether a secondary terminal function is activated in operation 701. The secondary terminal function activation may be performed when at least one or a combination of the following table 4 is satisfied.

[ TABLE 4] auxiliary terminal function

Meanwhile, according to an embodiment of the present disclosure, the terminal may determine whether to configure mode-2 (d) sidelink wireless communication based on at least one predetermined condition before determining whether to activate the secondary terminal function.

If the secondary terminal function is activated by the determination in operation 701, the terminal may inform the base station of the mode-2 (d) support capability and/or the mode-2 (d) secondary terminal function capability in operation 702. Operation 702 may be omitted when the base station does not need to know mode-2 (d) secondary terminal function capabilities and/or when the terminal is not in an RRC connection active state with the base station.

In operation 703, the terminal may transmit mode-2 (d) function indication information to the base station. The mode-2 (d) indicator of operation 703 may include a mode-2 (d) enabled region indicator.

In operation 704, the terminal may search for the presence of a target terminal of mode-2 (d). The search process for the target terminal may correspond to a search process using the PC5-S signaling message. The PC5-S signaling message transmitted by the terminal during the search corresponds to, for example, a search message, and may include at least one of a destination identifier of the target terminal, an indicator inquiring whether the target terminal exists, and a group identifier when the target terminal corresponds to a specific group. The terminal may receive a PC5-S signaling message (search response message) from one or more target terminals as a response to the PC5-S signaling that includes the information. The search response message may include at least one of an identifier of the terminal, an identifier of the target terminal, and a group identifier when the target terminal corresponds to a specific group.

In operation 704, the terminal may search for the presence of a target terminal of mode-2 (d). In operation 704, if the target terminal of the mode-2 (d) is found and there is no PC5 RRC unicast connection configuration with the target terminal, a PC5 RRC unicast connection configuration procedure with the target terminal may be performed.

In operation 705, the terminal may collect mode-2 (d) information from the target terminal. Mode-2 (d) information collection in operation 705 may be performed by the PC5 RRC unicast connection. The mode-2 (d) information may include information (at least one of interest transmission frequency list, interest reception frequency list, unicast destination ID, multicast destination ID, QFI, PQI, traffic mode information, and buffer status information) on the V2X application for allocating/configuring the sidelink radio resource to the target terminal.

If the secondary terminal function is not activated as determined in operation 701, the terminal may activate the target terminal function. The target terminal function activation may be performed when at least one of the following table 5 or a combination thereof is satisfied.

[ TABLE 5] target terminal function activation

On the other hand, the search of the secondary terminal may use the search procedure of the PC5-S signaling message using the above-described operation 704. As another embodiment, as a search procedure using the PC5-S signaling message, the terminal may transmit a PC5-S signaling message for search, and the signaling may include at least one of a destination identifier of the target terminal, an indicator inquiring whether the target terminal exists, an indicator indicating whether the target terminal exists, and a group identifier when the target terminal corresponds to a specific group. The terminal may receive a PC5-S signaling message corresponding to the secondary terminal search response message from one or more secondary terminals, and the secondary terminal search response message may include at least one of an identifier of the terminal, an identifier of the target terminal, and a group identifier when the target terminal corresponds to a specific group.

In operation 706, the terminal may inform the base station of mode-2 (d) support capability and/or mode-2 (d) target terminal function capability. Operation 706 may be omitted when the base station does not need to know mode-2 (d) target terminal function capabilities and/or when the terminal is not in an RRC connection active state with the base station.

In operation 707, the terminal may search for a secondary terminal. The presence or absence of the secondary terminal may be determined by receiving mode-2 (d) function indication information and/or a mode-2 (d) enabled area indicator transmitted from the secondary terminal. If the PC5 RRC unicast connection is not established with the secondary terminal, the terminal may perform a PC5 RRC unicast connection establishment procedure with the secondary terminal.

According to an embodiment, when one or more secondary terminals are searched, the terminal may select one secondary terminal. For example, the terminal may establish the PC5 RRC with all the searched secondary terminals. As another example, the terminal may arbitrarily select one secondary terminal from among all the searched secondary terminals and connect to the PC5 RRC. In another example, the terminal may select the secondary terminal with the best signal strength (e.g., SL RSRP), may select the secondary terminal with the best signal strength (e.g., Uu RSRP + SL RSRP), or may select the secondary terminal with the best battery level (e.g., battery remaining).

If there is no PC5 RRC unicast connection configuration with the secondary terminal, the terminal may perform a PC5 RRC unicast connection configuration procedure with the secondary terminal.

In operation 708, the terminal may transmit mode-2 (d) assistance information to the secondary terminal. The mode-2 (d) assistance information may include at least one of an interest transmission frequency list, an interest reception frequency list, a unicast destination ID, a multicast destination ID, QFI, PQI, traffic mode information, and buffer status information.

Referring to fig. 7B, in operation 711, the terminal may determine whether the secondary terminal function is activated. The secondary terminal function activation may be performed when at least one of the above table 2 or a combination thereof is satisfied.

If the secondary terminal function is activated by the determination of operation 711, the terminal may inform the base station of the mode-2 (d) support capability and/or the mode-2 (d) secondary terminal function capability in operation 712. Operation 712 may be omitted when the base station does not need to know mode-2 (d) secondary terminal function capabilities and/or when the terminal is not in an RRC connection active state with the base station.

In operation 713, the terminal may transmit mode-2 (d) function indication information to the base station. The mode-2 (d) function indication information of operation 713 may include a mode-2 (d) enable area indicator.

In operation 714, the terminal may search for the presence of a target terminal of mode-2 (d). The search process for the target terminal may correspond to a search process using the PC5-S signaling message. The PC5-S signaling message transmitted by the terminal during the search corresponds to, for example, a search message, and may include at least one of a destination identifier of the target terminal, an indicator inquiring whether the target terminal exists, and a group identifier when the target terminal corresponds to a specific group. The terminal may receive a PC5-S signaling message (search response message) from one or more target terminals as a response to the PC5-S signaling that includes the information. The search response message may include at least one of an identifier of the terminal, an identifier of the target terminal, and a group identifier when the target terminal corresponds to a specific group.

In operation 714, the terminal may search for the presence of a target terminal of mode-2 (d). In operation 714, if the target terminal of the mode-2 (d) is found and there is no PC5 RRC unicast connection configuration with the target terminal, the terminal may perform a PC5 RRC unicast connection configuration procedure with the target terminal.

In operation 715, the terminal may collect mode-2 (d) information from the target terminal. Mode-2 (d) information collection in operation 715 may be performed by the PC5 RRC unicast connection. The mode-2 (d) information may include information (at least one of interest transmission frequency list, interest reception frequency list, unicast destination ID, multicast destination ID, QFI, PQI, traffic mode information, and buffer status information) on the V2X application for allocating/setting the sidelink radio resource to the target terminal.

If the secondary terminal function is not activated through the determination of operation 711, the terminal may determine whether the target terminal function is activated. The target terminal function activation may be performed when at least one of the above table 5 or a combination thereof is satisfied.

In operation 717, the terminal may inform the base station of mode-2 (d) support capability and/or mode-2 (d) target terminal function capability. Operation 717 may be omitted when the base station does not need to know mode-2 (d) target terminal functional capabilities and/or when the terminal is not in an RRC connection active state with the base station.

In operation 718, the terminal may search for a secondary terminal. The presence or absence of the secondary terminal may be determined by receiving a mode-2 (d) indicator and/or a mode-2 (d) enabled area indicator transmitted by the secondary terminal. Meanwhile, the search for the secondary terminal may use the search procedure using the PC5-S signaling message of operation 714 described above. In another embodiment, as a search procedure using the PC5-S signaling message, the terminal may transmit a PC5-S signaling message for searching for a secondary terminal, and the signaling may include at least one of a destination identifier of the secondary terminal, an indicator inquiring whether the secondary terminal exists, an indicator indicating whether a target terminal exists, or a group identifier when the target terminal corresponds to a specific group.

The terminal may receive a PC5-S signaling message corresponding to the secondary terminal search response message from one or more secondary terminals, and the secondary terminal search response message may include at least one of a target terminal identifier, a secondary terminal identifier, and a group identifier to which the target terminal belongs. If there is no PC5RRC unicast connection configuration with the secondary terminal, the terminal may perform a PC5RRC unicast connection configuration procedure with the secondary terminal.

In operation 719, the terminal may transmit mode-2 (d) assistance information to the secondary terminal. The mode-2 (d) assistance information may include at least one of an interest transmission frequency list, an interest reception frequency list, a unicast destination ID, a multicast destination ID, QFI, PQI, traffic mode information, and buffer status information. According to an embodiment, when one or more secondary terminals are searched, the terminal may select one secondary terminal. For example, the terminal may establish the PC5RRC with all the searched secondary terminals. As another example, the terminal may arbitrarily select one secondary terminal from among all searched secondary terminals and connect the PC5 RRC. For another example, the terminal may select the secondary terminal with the best signal strength (e.g., SL RSRP), may select the secondary terminal with the best signal strength (e.g., Uu RSRP + SL RSRP), or may select the secondary terminal with the best battery level (e.g., battery remaining).

In performing operations 701 through 711 of fig. 7A through 7B according to another embodiment of the present disclosure, if it is determined that a terminal supporting a secondary terminal function is already nearby in the case of supporting the secondary terminal function among the conditions of table 4 described above, the terminal may proceed to operations 706 through 716 of fig. 7A through 7B without activating the secondary terminal function. The method for determining that a terminal supporting a secondary terminal function has been nearby may include determining, by the terminal, that a terminal supporting a secondary terminal function already exists through a mode-2 (d) indicator and/or a mode-2 (d) enabled area indicator received from the secondary terminal.

Fig. 8A illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d) according to various embodiments, fig. 8B illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d) according to various embodiments, and fig. 8C illustrates a signaling procedure for notifying capability information of a terminal supporting the sidelink mode-2 (d) according to various embodiments.

Referring to fig. 8A, if the terminal 800 receives the UE capability query message of operation 801 from the base station 810, the terminal 800 has an RRC connection configuration with the base station 810. In operation 802, the terminal 800 may transmit a sidelink mode-2 (d) function support capability to the base station 810 through a UE capability information message. The sidelink mode-2 (d) capability support capability information included in the UE capability information message may include at least one of mode-2 (d) capability indication information, mode-2 (d) secondary terminal information, and mode-2 (d) target terminal information.

According to another embodiment of the present disclosure, the UE capability information message including the sidelink mode-2 (d) capability support capability information may be transmitted without receiving the UE capability query message of operation 801.

Referring to fig. 8B, when the terminal 800 has an RRC connection configuration with the base station 810, the terminal 800 may transmit a sidelink mode-2 (d) function support capability to the base station 810 via at least one of a sidelink ue information message, a ueassisinstance information message, or an SLMode2 assistance information message in operation 811. The sidelink mode-2 (d) function support capability information may include at least one of mode-2 (d) function indication information, mode-2 (d) auxiliary terminal information, mode-2 (d) target terminal information, and mode-2 (d) auxiliary information. The mode-2 (d) assistance information may be included when the secondary terminal transmits the sidelink mode-2 (d) function support capability information to the base station, and the mode-2 (d) assistance information may not be included when the target terminal transmits the sidelink mode-2 (d) function support capability information to the base station.

The mode-2 (d) assistance information may include at least one of a list of transmission frequencies of interest, a list of reception frequencies of interest, a unicast destination ID, a multicast destination ID, QFI, PQI, traffic mode information, and buffer status information. The terminal 800 may transmit only mode-2 (d) assistance information to the base station 810 in at least one of a sildelinkueinformation message, a ueassassistanceinformation message, or a SLMode2das assistance information message, and when the base station 810 receives the mode-2 (d) assistance information, the base station 810 may recognize that the terminal 800 is an auxiliary terminal having a mode-2 (d) function capability.

The processes of fig. 8A-8B may correspond to operations 702 of fig. 7A-712 of fig. 7B for exchanging capability information between the secondary terminal and the base station. The processes of fig. 8A-8B may correspond to operations 706 of fig. 7A-717 of fig. 7B for exchanging capability information between the target terminal and the base station.

Referring to fig. 8C, when the UE 1800 activates the secondary terminal function, the UE 1800 may transmit mode-2 (d) function indication information and/or mode-2 (d) enabled area indicator information to the UE 2860 in operation 821. The information of operation 821 may be transmitted via at least one of a PC5-RRC unicast control signal, a PC5-RRC multicast control signal, and a PC5-RRC broadcast control signal. The control signal may be transmitted via at least one of an AS configuration message, a UE capability message, a SL V2X MIB, a SL V2X SIB, a PSCCH SCI, and a PC5 MAC CE. As another embodiment of the present disclosure, the information of operation 821 may be included in the V2X application message to be transmitted. The UE 2860, which received the information transmitted by the UE 1800 in operation 821, may identify the mode-2 (d) enabled area and/or identify that the UE 1800 is a secondary terminal supporting the mode-2 (d) function in operation 822.

A procedure in which the UE 1800 performs the role of a secondary terminal for supporting the mode-2 (d) function of the UE 2860 will be described with reference to fig. 9A to 9E. Further, when the UE 2860 activates the mode-2 (d) function in operation 822, the UE 2860 may notify the UE 1800 that the mode-2 (d) function supports notification and/or the mode-2 (d) function interest. This process will be described with reference to fig. 9B to 9E.

Fig. 9A illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure. Fig. 9B illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure. Fig. 9C illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure. Fig. 9D illustrates a signaling procedure for obtaining information required for sidelink resource allocation, in accordance with various embodiments of the present disclosure. Fig. 9E illustrates a signaling procedure for obtaining information needed for sidelink resource allocation, in accordance with various embodiments.

Referring to fig. 9A, when the UE 2900 activates the mode-2 (d) function, in operation 901, the UE 2900 may inform the UE 1960 that the mode-2 (d) function supports an announcement and/or a mode 2 function interest. The operations of operation 901 may be performed when the UE 2900 receives a mode-2 (d) function support notification and/or a mode-2 (d) function interest notification from the UE 1960 according to the process of at least one of fig. 9B through 9E, and determines a role of the terminal for which the UE 1960 performs secondary sidelink radio resource allocation and/or configuration. The SL mode-2 (d) information message sent in operation 901 may be sent via a PC5 RRC unicast connection between UE 1960 and UE 2900.

The information included in the SL mode-2 (d) information message may include at least one of: a destination id (dst id) corresponding to the application; a propagation type indicator when the DST ID is not classified by a propagation type (cast type); frequency information of interest corresponding to the DST ID; PQI information; traffic pattern information (packet transmission period, packet size, priority information, packet transmission offset) when a sidelink radio resource allocation of a grant (configured grant) type needs to be configured; a terminal identifier (e.g., V2X-RNTI); and serving cell information (when it is necessary to distinguish a terminal received from another base station).

An example of an asn.1 structure in the case of including a propagation type indicator for distinguishing a propagation type corresponding to a DST ID is shown in table 6 below, according to various embodiments of the present disclosure.

TABLE 6 ASN.1 structure for propagation type indicator

Upon receiving the information of operation 901, the UE 1960 may configure mode-2 (d) assistance information based on the information included in the SL mode 2d information message and send the information to the base station 990. Mode-2 (d) assistance information may include, in addition to UE 2900, information for one or more target terminals that UE 1960 assists with its assistance mode-2 (d) functions.

The mode-2 (d) assistance information transmitted in operation 902 may include at least one of an interest transmission frequency list, an interest reception frequency list, a unicast destination ID, a multicast destination ID, QFI, PQI, traffic mode information, and buffer status information. The UE 1960 may include mode-2 (d) assistance information in at least one of a SidelinkUEInformation message, a UEAssistanceInformation message, or a SLMode2das assssinceinformation message to the base station 990.

Referring to fig. 9B, in operation 911, a UE 1960 may transmit an AS configuration message including mode-2 (d) function indication information and/or a mode-2 (d) enabled area indicator to a UE 2900. In operation 912, the UE 2900 may send a SL mode2d information message including a mode-2 (d) function assistance notification and/or mode-2 (d) function interest information to the UE 1960.

Referring to fig. 9C, in operation 921, the UE 1960 may transmit a UE capability message including mode-2 (d) function indication information and/or a mode-2 (d) enabled area indicator to the UE 2900. In operation 922, the UE 2900 may send a SL mode2d information message including a mode-2 (d) function assistance notification and/or mode-2 (d) function interest information to the UE 1960.

Referring to fig. 9D, the UE 1960 may transmit an MIB-SLV2X message including mode-2 (D) function indication information and/or a mode-2 (D) enable region indicator to the UE 2900 in operation 931. In operation 932, UE 2900 may send a SL mode2d information message to UE 1960 that includes a mode-2 (d) function assistance notification and/or mode-2 (d) function interest information.

Referring to fig. 9E, in operation 941, the UE 1960 may transmit a V2X application message including mode-2 (d) function indication information and/or a mode-2 (d) enabled area indicator to the UE 2900. In operation 942, UE 2900 may send a SL mode 2d information message including a mode-2 (d) function assistance notification and/or mode-2 (d) function interest information to UE 1960.

Fig. 10A illustrates a signaling procedure for configuring sidelink resource allocation information, in accordance with various embodiments of the present disclosure. Fig. 10B illustrates a signaling procedure for configuring sidelink resource allocation information, in accordance with various embodiments of the present disclosure.

Referring to fig. 10A, in operation 1001, a base station 1080 may configure sidelink radio resource allocation and/or configuration of one or more target terminals 1060 based on mode-2 (d) assistance information of the target terminals 1060 collected by the assisting terminal 1000. The mode-2 (d) assistance information collected by the assistance terminal 1000 may include information transmitted in operation 902 of fig. 9A.

In operation 1002, a base station 1080 may provide configured sidelink radio resource allocation and/or configuration information of one or more target terminals 1060 to one or more target terminals 1060 through a helper terminal 1000. The sidelink radio resource allocation and/or configuration information is a sidelink radio resource allocated to the target terminal 1060 or resource configuration information to be used by the target terminal 1060 to request the sidelink radio resource from the base station 1080, and may include at least one of resource configuration information used by the target terminal 1060 to directly allocate the sidelink radio resource. The detailed process of fig. 10A will be described with reference to fig. 10B.

Referring to fig. 10B, in operation 1011, the base station 1080 may transmit an RRC reconfiguration message to the secondary terminal 1000 that includes sidelink radio resource allocation and/or configuration information for one or more target terminals 1060. The information transmitted in operation 1011 may include at least one of a destination ID list, sidelink radio resource pool information, sidelink radio resource allocation information, configuration information required for a sidelink radio resource request, mode 1 allocation and/or mode 2 allocation information, sidelink feedback transmission resource configuration information for providing radio resource allocation and/or configuration information for each target terminal 1060.

The mode 1 allocation information may include at least one of a configuration authorization type 1 to a configuration authorization type 2 to a dynamic authorization. The mode 2 allocation information may include at least one of sidelink radio resource pool and sidelink radio resource sensing configuration information. In response to the RRC configuration message, the secondary terminal 1000 may transmit an RRC configuration complete message to the base station 1080 in operation 1012. In operation 1013, the secondary terminal 1000 may transmit to the target terminal 1060 a SL mode 2d configuration message including the sidelink radio resource allocation and/or configuration information of the one or more target terminals 1060 received in the RRC configuration message. In response to the SL mode 2d configuration message, the one or more target terminals 1060 may transmit a SL mode 2d configuration complete message to the auxiliary terminal 1000 in operation 1014. The one or more target terminals 1060 may perform the sidelink radio resource allocation based on the sidelink radio resource allocation and/or the configuration information received in operation 1015.

When one or more target terminals 1060 allocate sidelink resources (which may include packet transmission resources and HARQ feedback resources) from the base station 1080, V2X packet transmission and reception may be performed using the obtained resources. When one or more target terminals 1060 receive mode 1 resource configuration information from the base station 1080, that is, if the resource configuration information corresponds to a case where an SR configuration or a configuration required for SL-BSR transmission is received, sidelink radio resources may be allocated to the target terminal 1060 based on the resource configuration information to perform V2X packet transmission and reception.

When one or more target terminals 1060 receives configuration information of configuration grant type 1 or configuration information of configuration grant type 2 of mode 1 resource configuration information from the base station 1080, sidelink radio resources may be allocated to the target terminal 1060 based on the configuration grant type 1 configuration information or the configuration grant type 2 configuration information to perform V2X packet transmission and reception. When one or more target terminals 1060 receive mode 2 resource configuration information, i.e., a sidelink radio resource pool or sensing configuration information, from the base station 1080, the target terminal 1060 may be allocated sidelink radio resources by itself based on the resource configuration information to perform V2X packet transmission and reception. In the fig. 10B embodiment, target terminal 1060 may or may not configure an RRC connection with base station 1080.

Next, a method of processing HARQ feedback in a system supporting mode-2 (d) according to various embodiments of the present disclosure will be described. There may be a case where the HARQ feedback transmission is specified for each V2X application required by each target terminal, and a case where the HARQ feedback transmission is not required is specified. For the case of designating transmission of HARQ feedback, the base station may allocate HARQ feedback transmission resources or configure configuration information on the HARQ feedback transmission resources. As an embodiment, the auxiliary terminal may include HARQ feedback enable/disable indication information regarding a service of each target terminal in mode-2 (d) auxiliary information of one or more target terminals to the base station. The base station may configure HARQ feedback transmission resource allocation and/or configuration information for the service of each target terminal based on HARQ feedback enable/disable indication information for the service of each target terminal.

As another embodiment, when mode-2 (d) assistance information of one or more target terminals is transmitted to the base station, the auxiliary terminal may not separately include HARQ feedback information of a service of each target terminal. The base station may configure sidelink resource allocation and/or configuration information for the service of each target terminal regardless of HARQ feedback. In this case, when the propagation type of the service corresponding to each target terminal is configured as unicast or multicast, the base station may feed back the HARQ feedback transmission resource allocation and/or the configuration information based on this. Each target terminal may determine HARQ feedback resources based on transmission resource allocation and/or configuration information configured by the base station.

For example, when the base station provides HARQ feedback transmission resource allocation and/or configuration information for unicast or multicast, the target terminal may be allocated HARQ feedback transmission resources based on this information. As another example, when the base station does not provide HARQ feedback transmission resource allocation and/or configuration information, the target terminal may allocate HARQ feedback transmission resources by itself. As another example, when the base station does not provide HARQ feedback transmission resource allocation and/or configuration information, the target terminal may allocate HARQ feedback transmission resources by applying the same packet transmission resource allocation and/or configuration information corresponding to the service. As another example, when the base station does not provide HARQ feedback transmission resource allocation and/or configuration information, the target terminal may be allocated HARQ feedback transmission resources based on predefined HARQ feedback transmission resources.

According to various embodiments of the present disclosure, a method for distinguishing between a sidelink resource allocation request for transmitting a PC5 RRC control message and a sidelink resource allocation request for transmitting a PC5 data message will be described. For example, when the base station operates a mode for allocating sidelink radio resources according to a conventional method, there is no way to distinguish between a resource request for PC5 RRC control message transmission and a resource request for PC5 data message transmission. Therefore, it is impossible to support transmission distinction of the control message and the data message, and there is no way to distinguish the control message or the data message that needs to be transmitted first.

The method for distinguishing the PC5 RRC control message and the PC5 data message provided by the present disclosure may be at least one of the following or a combination thereof: (1) respectively defining PC5-RRC control message indicator/PC 5 data message indicator; (2) defined by distinguishing the PQI value corresponding to the PC5-RRC control message from the PQI value corresponding to the PC5 data message; (3) defined by distinguishing the QFI value corresponding to the PC5-RRC control message from the QFI value corresponding to the PC5 data message; (4) defined by distinguishing the priority value corresponding to the PC5-RRC control message from the priority value corresponding to the PC5 data message; (5) defined by distinguishing the destination ID corresponding to the PC5-RRC control message from the destination ID corresponding to the PC5 data message; (6) the message including the sidelink radio resource allocation request corresponding to the PC5-RRC control message does not include the destination ID, and the message including the sidelink radio resource allocation request corresponding to the PC5 data message includes the destination ID (e.g., for the PC5 data message if the sildenkuueinformation message includes a DST ID, or for the PC5 RRC control message if the sildenkuueinformation message does not include a DST ID); and (7) by distinguishing an SR (scheduling request) configuration for PC5 RRC control message transmission and an SR configuration for PC5 data message transmission.

Table 7 shows various examples of asn.1 structures of scheme (1).

TABLE 7 ASN.1 Structure of scheme (1)

Table 8 shows an example of the asn.1 structure of scheme (6).

TABLE 8 ASN.1 Structure of scheme (6)

Operations of the terminal and the base station according to various embodiments of the present disclosure to process the sidelink radio resource allocation for the PC5 RRC control message and the PC5 data message will be described.

In one embodiment, a case (e.g., scenario 1) is provided where the base station scheduling mode (mode 1) is operated.

When the terminal requests a sidelink radio resource for transmitting the PC5 RRC control message or the PC5 data message, the terminal may transmit a sidelink radio resource allocation request message to the base station using at least one of the above-described methods (1) to (6) or a combination thereof.

The base station, which has received the sidelink radio resource request from the terminal in at least one of the methods (1) to (6) or a combination thereof, may respectively allocate the SR configuration for the PC5 RRC control message and the SR configuration for the PC5 data message as in the method (7). The base station having received the sidelink radio resource request from the terminal in at least one of the methods (1) to (6) or a combination thereof may allocate the SL resource pool for the PC5 RRC control message and the SL resource pool for the PC5 data message, respectively.

According to another embodiment of the present disclosure, the base station may pre-configure SR configuration for the PC5 RRC control message to a terminal supporting unicast of the PC5 without receiving a separate request from the terminal.

According to another embodiment of the present disclosure, the base station may allocate the SL resource pool for the PC5 RRC control message and the SL resource pool for the PC5 data message, respectively, without receiving separate requests from the terminal.

According to another embodiment of the present disclosure, the base station may respectively allocate a Uu SR configuration for triggering message transmission of a sidelink radio resource request for a PC5 RRC control message and a Uu SR configuration for triggering message transmission of a sidelink radio resource request for a PC5 data message. For example, it is possible to distinguish between an SR configuration transmitting a sidelinkue information message including information on a PC5 RRC control message and an SR configuration transmitting a sidelinkue information message including information on a PC5 data message.

The terminal may transmit a PC5 data message when the terminal has sufficient space in the sidelink radio resource allocated for PC5 RRC control message transmission. In contrast, when the terminal has sufficient space in the sidelink radio resource allocated for the PC5 data message transmission, the terminal can transmit the PC5 RRC control message.

In one embodiment, a case (e.g., scenario 2) is provided where the direct terminal assignment mode (mode 2) is operated.

According to an embodiment of the present disclosure, the sidelink radio resource pool for transmitting the PC5 RRC control message and the sidelink radio resource pool for transmitting the PC5 data message may be separately operated.

According to another embodiment of the present disclosure, if there is no division in the sidelink radio resource pool, the terminal may preferentially allocate a resource for transmitting the PC5 RRC control message.

According to another embodiment of the present disclosure, if there is no division in the sidelink radio resource pool, the terminal may preferentially allocate resources when the priority value of the PC5 data message is greater than or equal to the priority threshold.

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

When the methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within the electronic device. The at least one program may include instructions for causing the electronic device to perform methods in accordance with various embodiments of the present disclosure as defined by the appended claims and/or disclosed herein.

The program (software module or software) may be stored in non-volatile memory, including random access and flash memory, Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disk storage devices, compact disk-ROM (CD-ROM), Digital Versatile Disks (DVD), or other types of optical storage devices or magnetic tape. Alternatively, any combination of some or all of them may form a memory storing a program. Further, a plurality of such memories may be included in the electronic device.

Further, the program may be stored in an attachable storage device that can access the electronic device through a communication network such as the internet, an intranet, a Local Area Network (LAN), a wide LAN (wlan), and a Storage Area Network (SAN), or a combination thereof. Such a storage device may access the electronic device via an external port. In addition, a separate storage device on the communication network may access the portable electronic device.

In the above detailed embodiments of the present disclosure, elements included in the present disclosure are expressed in the singular or plural according to the presented detailed embodiments. However, the singular or plural forms are appropriately selected to the presented case for convenience of description, and the present disclosure is not limited by the elements expressed in the singular or plural forms. Thus, elements in the plural may also include a single element, or elements in the singular may also include a plurality of elements.

Although specific embodiments have been described in the detailed description of the disclosure, modifications and changes may be made thereto without departing from the scope of the disclosure. Therefore, the scope of the present disclosure should not be defined as limited to the embodiments, but should be defined by the appended claims and equivalents thereof.

While the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace these changes and modifications as fall within the scope of the appended claims.

Claims

1. A method of a terminal in a wireless communication system, the method comprising:

determining whether mode-2 (d) sidelink wireless communication is configured based on at least one predetermined condition;

determining whether a secondary terminal function is activated in a case where the mode-2 (d) side link wireless communication is configured;

identifying at least one target terminal in case the secondary terminal function is activated; and

information regarding mode-2 (d) sidelink wireless communications is received from the identified target terminal.

2. The method of claim 1, wherein the at least one predetermined condition comprises at least one of: a case where the terminal is located in a mode-2 (d) sidelink wireless communication enabled region, a case where an application related to the mode-2 (d) sidelink wireless communication is operated, or a case where information for the mode-2 (d) sidelink wireless communication is received from a base station.

3. The method of claim 1, wherein in a case where the terminal is a terminal supporting a secondary terminal function and in a case where the at least one predetermined condition is determined to be satisfied, it is determined that mode-2 (d) side link wireless communication is configured and the secondary terminal function is activated.

4. The method of claim 1, further comprising:

determining whether the target terminal function is activated in case that the auxiliary terminal function is not activated;

searching at least one auxiliary terminal under the condition that the function of the target terminal is activated;

selecting one of the secondary terminals based on at least one of the signal strength or the battery level information; and

if a plurality of searched auxiliary terminals are identified, mode-2 (d) side link wireless communication assistance information is transmitted to the selected auxiliary terminal.

5. The method of claim 4, further comprising transmitting at least one of mode-2 (d) sidelink wireless communication assistance capability or target terminal function capability for mode-2 (d) sidelink wireless communication to a base station if the target terminal function is activated.

6. The method of claim 1, further comprising transmitting at least one of mode-2 (d) sidelink wireless communication assistance capability or target terminal function capability for mode-2 (d) sidelink wireless communication to a base station if the secondary terminal function is activated.

7. The method of claim 1, further comprising:

transmitting information on mode-2 (d) sidelink wireless communication received from the target terminal to the base station in case that the secondary terminal function is activated;

receiving resource configuration information on mode-2 (d) sidelink wireless communication for a target terminal from a base station; and

transmitting the received resource configuration information for the target terminal regarding the mode-2 (d) sidelink wireless communication to the target terminal.

8. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

a controller configured to:

receiving information regarding mode-2 (d) sidelink wireless communications from the identified target terminal via the transceiver.

9. The terminal of claim 8, wherein the at least one predetermined condition comprises at least one of: a case where the terminal is located in a mode-2 (d) sidelink wireless communication enabled region, a case where an application related to the mode-2 (d) sidelink wireless communication is operated, or a case where information for the mode-2 (d) sidelink wireless communication is received from a base station.

10. The terminal of claim 8, wherein the controller determines that mode-2 (d) side link wireless communication is configured and controls activation of the secondary terminal function in a case where the terminal is a terminal supporting the secondary terminal function and predetermined at least one condition is determined to be satisfied.

11. The terminal of claim 8, wherein:

the controller is further configured to:

selecting one of the auxiliary terminals based on at least one of signal strength or battery level information in case that a plurality of searched auxiliary terminals are identified; and

transmitting mode-2 (d) sidelink wireless communication assistance information to the selected secondary terminal via the transceiver.

12. The terminal of claim 11, wherein the controller controls the transceiver to transmit at least one of a mode-2 (d) sidelink wireless communication assistance capability and a target terminal function capability for mode-2 (d) sidelink wireless communication to a base station in a case that a target terminal function is activated.

13. The terminal of claim 8, wherein the controller controls the transceiver to transmit at least one of a mode-2 (d) sidelink wireless communication assistance capability and a target terminal function capability for mode-2 (d) sidelink wireless communication to a base station in a case that a secondary terminal function is activated.

14. The terminal of claim 8, wherein the controller controls the transceiver to: