KR20200115100A - Apparatus and method for assisting sidelink resource configuration and allocation for direct communication in wireless communication system - Google Patents

Abstract

The present disclosure relates to a 5^th generation (5G) or pre-5G communication system to support a higher data transmission rate than that of 4^th generation (4G) communication system such as a long term evolution (LTE). According to an embodiment of the present disclosure, an operation method of a terminal in a wireless communication system may comprise the processes of: activating sidelink mode-2(d) and obtaining sidelink radio resource setting information of another terminal; and delivering the obtained sidelink radio resource setting information to a target terminal. According to an embodiment of the present disclosure, an operation method of a terminal in a wireless communication system may comprise the processes of: activating sidelink mode-2(d) and receiving sidelink radio resource setting information from another terminal; and allocating a sidelink radio resource by the base station or the terminal itself by using the transmitted sidelink radio resource setting information.

Description

Device and method to assist sidelink resource allocation in terminal direct communication system {APPARATUS AND METHOD FOR ASSISTING SIDELINK RESOURCE CONFIGURATION AND ALLOCATION FOR DIRECT COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM}

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

Efforts have been made to develop an improved 5G (5th generation) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G (4th generation) communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a Beyond 4G Network communication system or a Long Term Evolution (LTE) system (Post LTE) system.

In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (for example, the 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed.

In addition, in the 5G system, the advanced coding modulation (Advanced Coding Modulation, ACM) method of FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding), and advanced access technology, FBMC (Filter Bank Multi Carrier) ), NOMA (Non Orthogonal Multiple Access), and SCMA (Sparse Code Multiple Access) are being developed.

The 5G system is considering supporting various services compared to the existing 4G system. For example, the most representative services are mobile ultra-wide band communication service (eMBB: enhanced mobile broad band), ultra-reliable and low latency communication service (URLLC: ultra-reliable and low latency communication), and large-scale device-to-device communication service (mMTC: massive machine type communication), evolved multimedia broadcast/multicast service (eMBMS), and the like. In addition, a system that provides the URLLC service may be referred to as a URLLC system, and a system that provides an eMBB service may be referred to as an eMBB system. In addition, the terms service and system may be used interchangeably.

Among them, URLLC service is a service newly considered in 5G system, unlike existing 4G system, and ultra-high reliability (for example, packet error rate about 10-5) and low latency (for example, compared to other services) About 0.5msec). In order to satisfy such strict requirements, the URLLC service may need to apply a transmission time interval (TTI) shorter than that of the eMBB service, and various operation methods utilizing this may be considered.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied.

In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. will be. As the big data processing technology described above, a cloud radio access network (cloud RAN) is applied as an example of the convergence of 5G technology and IoT technology.

In 5G systems, air interface schemes for providing services having various quality of service (QoS) requirements are being discussed. For example, a direct communication method for a vehicle to everything (V2X) terminal has been proposed. Furthermore, various discussions are underway to reduce communication time, increase reliability, and support direct communication between terminals more efficiently. V2X (Vehicle to Everything) is a general term that refers to all types of communication methods applicable to road vehicles, and in combination with the development of wireless communication technology, various additional services in addition to the initial safety use cases are becoming possible.

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

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

The present invention for solving the above problem is a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

An apparatus and method according to various embodiments of the present disclosure provides a method for supporting a vehicle communication service that requires various quality of service (QoS) by using direct communication between terminals in a vehicle communication system, and Reliability and low latency in vehicle communication are provided by providing a method to reduce the delay time until direct communication resource acquisition by reducing uplink and downlink signaling required to acquire direct communication resources between base stations, and by reducing uplink/downlink signaling. Make it possible to achieve the required value.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the technical field to which the present disclosure belongs from the following description. will be.

1 illustrates a wireless communication system according to various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4A to 4C illustrate a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.
5 illustrates a situation in which direct communication between terminals is performed using a sidelink radio access technology (RAT) according to various embodiments of the present disclosure.
6 illustrates a scenario of operating mode 2(d) among sidelink resource allocation schemes according to various embodiments of the present disclosure.
7 illustrates an operation of a terminal triggering a sidelink mode 2(d) according to various embodiments of the present disclosure.
8 illustrates a signaling procedure for notifying capability information of a terminal supporting sidelink mode 2(d) according to various embodiments of the present disclosure.
9 illustrates a signaling procedure for obtaining information necessary for sidelink resource allocation according to various embodiments of the present disclosure.
10 illustrates a signaling procedure for setting sidelink resource allocation information according to various embodiments of the present disclosure.

Terms used in the present disclosure are used only to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the technical field described in the present disclosure. Among the terms used in the present disclosure, terms defined in a general dictionary may be interpreted as having the same or similar meaning as the meaning in the context of the related technology, and unless explicitly defined in the present disclosure, an ideal or excessively formal meaning Is not interpreted as. In some cases, even terms defined in the present disclosure cannot be interpreted to exclude embodiments of the present disclosure.

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

Hereinafter, the present disclosure relates to an apparatus and method for allocating and/or obtaining a sidelink radio resource in order to support a vehicle to everything communication (V2X) service in a wireless communication system using a direct communication protocol between terminals. Specifically, the present disclosure satisfies the QoS level required for various V2X services based on an operation procedure of a terminal that assists in setting sidelink radio resources for sidelink direct communication between V2X (vehicle to everything) terminals in a wireless communication system. Describe the skills you can do.

In the following description, a term referring to a signal, a term referring to a channel, a term referring to control information, a term referring to network entities, a term referring to a component of a device, etc. are for convenience of description. It is illustrated. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

In addition, the present disclosure describes various embodiments using terms used in some communication standards (eg, 3rd Generation Partnership Project (3GPP)), but this is only an example for description. Various embodiments of the present disclosure may be easily modified and applied to other communication systems.

According to various embodiments of the present disclosure, a method of operating a terminal in a wireless communication system is a process of determining service information requesting direct sidelink communication based on mode 2(d), and assisting direct sidelink communication based on mode 2(d). The process of determining the capable terminal capability, the process of notifying the base station or other terminals of the secondary terminal capability of the mode 2(d)-based sidelink direct communication, and a terminal supporting the mode 2(d)-based sidelink direct communication Searching process, mode 2(d)-based sidelink direct communication, secondary terminal information acquisition, mode 2(d)-based sidelink direct communication, surrounding terminal information required, mode 2(d) The process of transmitting information of the terminal requiring direct sidelink communication to the base station, the process of acquiring the resource information required for the mode 2(d)-based sidelink direct communication from the base station, and the mode 2(d)-based sidelink direct communication The process of delivering the resource information necessary for the peripheral terminal to the neighboring terminal, the process of acquiring the resource information required for the mode 2(d)-based sidelink direct communication from the auxiliary terminal, the resource information required for the acquired mode 2(d)-based sidelink direct communication A process of requesting resource allocation from a base station from, and a process of obtaining a resource from among resource information required for the acquired mode 2(d)-based sidelink direct communication.

According to various embodiments of the present disclosure, in a wireless communication system, a terminal device includes a transceiver and at least one processor functionally coupled to the transceiver. The at least one processor, when it is determined that the terminal is a secondary terminal for mode 2(d)-based sidelink direct communication, the terminal is It is possible to obtain information and request resource information necessary for direct sidelink communication of other terminals from the base station, and obtain resource information necessary for direct sidelink communication of other terminals from the base station. In the at least one process, when it is determined that the terminal requires mode 2(d)-based sidelink direct communication and is not an auxiliary terminal of the mode 2(d)-based sidelink direct communication, mode 2(d) ) To obtain the auxiliary terminal information of the direct sidelink communication based on the mode 2(d) and transmit the information necessary for the direct sidelink communication to the auxiliary terminal of the direct sidelink communication based on the mode 2(d), and the sidelink direct communication through the auxiliary terminal. You can acquire necessary resource information.

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

1 illustrates a wireless communication system according to various embodiments of the present disclosure.

1 illustrates a base station 110, a terminal 1 120, and a terminal 2 130 as some of nodes using a radio channel in a wireless communication system. 1 shows only one base station, but another base station that is the same or similar to the base station 110 may be further included. FIG. 1 shows only two terminals, but other terminals identical or similar to terminal 1 120 and terminal 2 130 may be further included.

The base station 110 is a network infrastructure that provides wireless access to the terminals 120 and 130. The base station 110 has coverage defined as a certain geographic area based on a distance at which a signal can be transmitted. In addition to the base station, the base station 110 includes'access point (AP)','eNodeB, eNB', '5G node', and '5G nodeB (gNodeB, gNB). )','wireless point','transmission/reception point (TRP)', or other terms having an equivalent technical meaning.

Each of the terminal 1 120 and the terminal 2 130 is a device used by a user and performs communication with the base station 110 through a wireless channel. In some cases, at least one of the terminal 1 120 and the terminal 2 130 may be operated without user involvement. That is, at least one of the terminal 1 120 and the terminal 2 130 is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the terminal 1 120 and the terminal 2 130 is a terminal other than'user equipment (UE)','mobile station','subscriber station', and'remote terminal ( remote terminal)','wireless terminal', or'user device', or another term having an equivalent technical meaning.

The base station 110, the terminal 1 120, and the terminal 2 130 may transmit and receive radio signals in a sub 6 GHz band and a millimeter wave (mmWave) band (eg, 28 GHz, 30 GHz, 38 GHz, 60 GHz). In this case, in order to improve the channel gain, the base station 110, the terminal 1 120, and the terminal 130 may perform beamforming. Here, beamforming may include transmission beamforming and reception beamforming. That is, the base station 110, the terminal 1 120, and the terminal 2 130 may impart directivity to a transmitted signal or a received signal. To this end, the base station 110 and the terminals 120 and 130 may select the serving beams 112, 113, 121, and 131 through a beam search or beam management procedure. . After the serving beams 112, 113, 121, 131 are selected, subsequent communication may be performed through a resource having a quasi-co-located (QCL) relationship with the resource transmitting the serving beams 112, 113, 121, 131. have.

If large-scale characteristics of the channel carrying the symbol on the first antenna port can be inferred from the channel carrying the symbol on the second antenna port, the first antenna port and the second antenna port are in a QCL relationship. Can be evaluated. For example, a wide range of characteristics include delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial receiver parameter. It may include at least one of.

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

The configuration illustrated in FIG. 2 can be understood as the configuration of the base station 110. Terms such as'... unit' and'... group' used below refer to units that process at least one function or operation, which can be implemented by hardware or software, or a combination of hardware and software. have.

Referring to FIG. 2, the base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a control unit 240.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the wireless communication unit 210 restores the received bit stream through demodulation and decoding of the baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal and then transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), and the like. In addition, the wireless communication unit 210 may include a plurality of transmission/reception paths. Further, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, etc. It can be composed of. The digital unit may be implemented with at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a'transmitter', a'receiver', or a'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used to mean that the above-described processing is performed by the wireless communication unit 210.

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts the bit stream transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, and converts a physical signal received from another node. Convert to bit string.

The storage unit 230 stores data such as a basic program, an application program, and setting information for the operation of the base station. The storage unit 230 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 230 provides stored data according to the request of the control unit 240.

The controller 240 controls overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. In addition, the control unit 240 writes and reads data in the storage unit 230. In addition, the control unit 240 may perform functions of a protocol stack required by a communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210. To this end, the control unit 240 may include at least one processor.

According to various embodiments, the control unit 240 may transmit radio resource control (RRC) configuration information to the terminals 120 and 130. The controller 240 may transmit 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 to be described later.

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

The configuration illustrated in FIG. 3 may be understood as the configuration of the terminal 1 120 or the terminal 2 130. Terms such as'... unit' and'... group' used below refer to units that process at least one function or operation, which can be implemented by hardware or software, or a combination of hardware and software. have.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the system. For example, when transmitting data, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the communication unit 310 restores the received bit stream through demodulation and decoding of the baseband signal. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal and transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In addition, the communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the communication unit 310 may be composed of a digital circuit and an analog circuit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital circuit and the analog circuit may be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Furthermore, the communication unit 310 may perform beamforming.

In addition, the communication unit 310 may include different communication modules to process signals of different frequency bands. Furthermore, the communication unit 310 may include a plurality of communication modules to support a plurality of different wireless access technologies. For example, different wireless access technologies include Bluetooth low energy (BLE), Wireless Fidelity (Wi-Fi), WiFi Gigabyte (WiGig), and cellular networks (e.g., Long Term Evolution (LTE)). In addition, different frequency bands may include a super high frequency (SHF) (eg 2.5GHz, 3.5 GHz, 5GHz) band, and a millimeter wave (eg 60GHz) band.

The communication unit 310 transmits and receives signals as described above. Accordingly, all or part of the communication unit 310 may be referred to as a'transmitting unit', a'receiving unit', or a'transmitting/receiving unit'. In addition, in the following description, transmission and reception performed through a wireless channel are used in a sense including the processing as described above by the communication unit 310.

The storage unit 320 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 320 may be formed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. In addition, the storage unit 320 provides stored data according to the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. In addition, the control unit 330 writes and reads data in the storage unit 320. In addition, the control unit 330 may perform functions of a protocol stack required by a communication standard. To this end, the control unit 330 may include at least one processor or a micro processor, or may be a part of a processor. In addition, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP).

According to various embodiments, the control unit 330 determines that the terminals 120 and 130 activate a function that assists setting radio resources for performing sidelink direct communication of other terminals, and other terminals and base stations ( A process of notifying 110) of the support capability for a function of assisting radio resource setting, and a process of acquiring information of another terminal to obtain sidelink radio resource information by using the radio resource setting assist function of the terminals 120 and 130 And providing the obtained information to the base station 110, receiving sidelink radio resource information of another terminal from the base station 110, and transmitting the received sidelink radio resource information to the other terminal. The process can be carried out. For example, the controller 330 may control the terminal to perform operations according to various embodiments to be described later.

4A to 4C illustrate a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure.

4A to 4C show an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3. Specifically, FIGS. 4A to 4C are parts of the wireless communication unit 210 of FIG. 2 or the communication unit 310 of FIG. 3, and illustrate components for performing beamforming.

4A, the wireless communication unit 210 or the communication unit 310 includes an encoding and modulating unit 402, a digital beamforming unit 404, a plurality of transmission paths 406-1 to 406-N, and an analog beam. It includes a forming part 408.

The encoding and modulating unit 402 performs channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoding and modulating unit 402 generates modulation symbols by performing constellation mapping.

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

The plurality of transmission paths 406-1 to 406-N convert digital beamformed digital signals into analog signals. To this end, each of the plurality of transmission paths 406-1 to 406-N may include an inverse fast fourier transform (IFFT) operation unit, a cyclic prefix (CP) insertion unit, a DAC, and an up-conversion unit. The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) scheme, and may be excluded when another physical layer scheme (eg, filter bank multi-carrier (FBMC)) is applied. That is, the plurality of transmission paths 406-1 to 406-N provide an independent signal processing process for a plurality of streams generated through digital beamforming. However, depending on the implementation method, some of the components of the plurality of transmission paths 406-1 to 406-N may be used in common.

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

Referring to FIG. 4B, signals input to the analog beamforming unit 408 are transmitted through antennas through phase/magnitude conversion and amplification operations. In this case, the signals of each path are transmitted through different antenna sets, that is, antenna arrays. Looking at the processing of the signal input through the first path, the signal is converted into signal sequences having different or the same phase/magnitude by the phase/magnitude converters 412-1-1 to 412-1-M, and amplifiers After being amplified by (414-1-1 to 414-1-M), it is transmitted through antennas.

Referring to FIG. 4C, signals input to the analog beamforming unit 408 are transmitted through antennas through phase/magnitude conversion and amplification operations. In this case, the signals of each path are transmitted through the same antenna set, that is, an antenna array. Looking at the processing of the signal input through the first path, the signal is converted into signal sequences having different or the same phase/magnitude by the phase/magnitude converters 412-1-1 to 412-1-M, and amplifiers (414-1-1 to 414-1-M). Then, the amplified signals are summed by the summing units 416-1-1 to 416-1-M based on the antenna element so as to be transmitted through one antenna array, and then transmitted through the antennas.

FIG. 4B illustrates an example in which an independent antenna array for each transmission path is used, and FIG. 4C illustrates an example in which transmission paths share one antenna array. However, according to another embodiment, some transmission paths may use an independent antenna array, and other transmission paths may share one antenna array. Furthermore, according to another embodiment, a structure capable of adaptively changing according to a situation may be used by applying a structure that is switchable between transmission paths and antenna arrays.

V2X service can be divided into basic safety service and advanced service. Basic safety services may include detailed services such as vehicle notification (CAM or BSM) service, left turn notification service, front vehicle collision warning service, emergency vehicle approach notification service, forward obstacle warning service, and intersection signal information service. V2X information can be transmitted and received using a cast or groupcast transmission method. Advanced service not only strengthens QoS requirements than basic safety service, but also V2X using unicast and groupcast transmission methods in addition to broadcast so that V2X information can be transmitted and received within a specific vehicle group or V2X information between two vehicles. Request a way to transmit and receive information. Advanced services may include detailed services such as platoon driving service, autonomous driving service, remote driving service, and extended sensor-based V2X service.

For V2X service, the UE in ng-RAN (gNB) connected to the 5G core network or E-UTRAN (ng-eNB) connected to the 5G core network is V2X through ng-RAN or E-UTRAN. Service can be performed. As another embodiment, when a base station (ng-RAN or ng-eNB) is connected to an evolved packet core network (EPC), a V2X service may be performed through the base station. As another embodiment, when a base station (eNB) is connected to an evolved packet core network (EPC), a V2X service may be performed through the base station. At this time, the V2X wireless interface communication method that can be used for direct communication between terminals is at least one of unicast, groupcast, and broadcast, and wireless communication parameters suitable for the QoS requirements of V2X services when performing V2X transmission and reception in each communication method. Should provide a way to manage and set it up.

A system that performs direct communication between terminals based on LTE wireless communication defines that the transmitting terminal selects and operates parameters necessary for transmission by itself. In the LTE wireless communication base, V2X service messages for basic safety are transmitted in a direct communication method between terminals.The QoS requirements of basic safety V2X services are not strict, and even if basic safety services are diverse, QoS requirements between services are not diverse. The differentiation between the liver is not great. Therefore, even in a mode in which the base station schedules radio resources to be used for direct communication between terminals based on LTE wireless communication, the base station does not need to obtain detailed QoS requirements information for the V2X service, and schedules radio resources. It is operated at the level of managing and setting parameters arbitrarily.

Advanced V2X service has various QoS requirements, and there is a large difference in QoS level required for each V2X service. In the case of a specific advanced V2X service, a radio resource and radio parameter for direct communication must be set to satisfy the strict QoS requirements of the service so that the service can be operated. Therefore, a system based on direct communication between terminals for supporting Advanced V2X service should provide a method of guaranteeing QoS of a service compared to a conventional system.

In the present invention, a method of acquiring sidelink radio resource information for performing a vehicle-to-vehicle direct communication method required by a basic safety service or an advanced service according to various embodiments will be described.

5 shows a situation in which direct communication between terminals is performed using a sidelink RAT according to various embodiments of the present disclosure.

5(a) shows a scenario in which terminals in gNB coverage perform direct communication. In Figure 5 (a), the resource allocation setting parameter information of the sidelink radio bearer to be used for unicast, broadcast, or groupcast-based V2X packet transmission and reception between terminals is determined through the system information message to the RRC dedicated message of the gNB 110. , 130), or may be preset in the terminals 120 and 130. The terminals 120 and 130 performing direct communication may transmit sidelink resource allocation request information necessary for V2X service packet transmission to the gNB 110 and obtain sidelink resource allocation and/or configuration information from the gNB 110. have. The sidelink resource allocation request information or sidelink resource allocation and/or configuration information may be transmitted through a terminal assisting radio resource configuration.

5(b) shows a scenario in which terminals 120 and 130 in ng-eNB coverage perform direct communication. In Figure 5(b), the configuration parameter information of the sidelink radio bearer to be used for unicast, groupcast, or broadcast-based V2X packet transmission/reception between terminals is provided by the terminal 120 through a system information message or an RRC dedicated message of the ng-eNB 110. , 130), or may be preset in the terminals 120 and 130. The terminals 120 and 130 performing direct communication transmit sidelink resource allocation request information required for V2X service packet transmission to the ng-eNB 110 and sidelink resource allocation and/or configuration information from the ng-eNB 110 Can be obtained. The sidelink resource allocation request information or sidelink resource allocation and/or configuration information may be transmitted through a terminal assisting radio resource configuration.

FIG. 5C shows a scenario in which the terminal 120 in gNB coverage and the terminal 130 in eNB coverage perform direct communication. The configuration parameter information of the sidelink radio bearer to be used for transmitting and receiving unicast, groupcast, or broadcast-based V2X packets between the terminals is transmitted to the terminals 120 and 130 through the system information message or the RRC dedicated message of the gNB 110 or It may be preset to (120, 130). The terminals 120 and 130 performing direct communication may transmit sidelink resource allocation request information necessary for V2X service packet transmission to the gNB 110 and obtain sidelink resource allocation and/or configuration information from the gNB 110. have. The sidelink resource allocation request information or sidelink resource allocation and/or configuration information may be transmitted through a terminal assisting radio resource configuration.

FIG. 5(d) shows a scenario in which terminals 120 and 130 in eNB coverage perform direct communication. The configuration parameter information of the sidelink radio bearer to be used for V2X packet transmission and reception used for unicast, groupcast, or broadcast-based V2X packet transmission and reception between the terminals is transmitted through the System information message or RRC dedicated message of the eNB 110 or is preset. There may be. The terminals 120 and 130 performing direct communication may transmit sidelink resource allocation request information required for V2X service packet transmission to the eNB 110 and obtain sidelink resource allocation and/or configuration information from the eNB 110. have. The sidelink resource allocation request information or sidelink resource allocation and/or configuration information may be transmitted through a terminal assisting radio resource configuration.

According to various embodiments of the present invention, the sidelink radio resource delivered by a terminal assisting in setting a sidelink radio resource for direct communication between terminals is a unicast type V2X message transmission/reception, a broadcast type V2X message transmission/reception, a groupcast method. It can be used to transmit and receive V2X messages.

Next, a scenario of operating sidelink mode 2(d) among sidelink resource allocation methods required for direct communication between terminals will be described with reference to FIG. 6.

6 illustrates a scenario of operating mode 2(d) among sidelink resource allocation schemes according to various embodiments of the present disclosure.

Various embodiments of the present invention describe a case where the UE is located within the coverage of a base station and the UE is in the RRC connected mode, but can also be applied when the UE is in the RRC idle mode or the RRC connection disable mode or out-of-coverage. .

Sidelink mode 2(d) corresponds to a resource allocation method that can acquire sidelink resource information of terminal A supporting direct communication between terminals through terminal B supporting direct communication between terminals. The resource information may correspond to a resource pool or resource allocation setting information required for the terminal A to request a sidelink resource from the base station, and the resource information to be allocated from the base station. The resource information may correspond to a resource pool or resource allocation setting information required for the terminal A to directly select a sidelink resource. The resource information may correspond to sidelink resources allocated by the base station. Upon receiving the resource pool or resource allocation setting information, terminal A can perform a procedure for receiving allocation of a sidelink resource to be actually used from the base station, and terminal A performs direct communication with other terminals based on the allocated resources. can do. Upon receiving the resource pool or resource allocation configuration information, terminal A may select a resource by itself (eg, sensing-based or random selection) and perform direct communication with another terminal from the selected resource. Information indicating whether the terminal A uses a mode in which a sidelink resource is allocated from a base station or a mode in which a sidelink resource is allocated by itself is used may be included in the resource pool or resource allocation setting information transmitted through the terminal B. have. Terminal B may correspond to an auxiliary terminal that performs an operation of obtaining resource information from a base station for terminal A.

Referring to FIG. 6A, an embodiment of platooning (cluster driving) is shown. The platooning may be an example of static group communication. According to various embodiments of the present disclosure, in flapping, vehicle terminals form a group to perform direct communication between terminals. The group may be composed of a leader terminal 600 and a member terminal 610. When the group leader terminal 600 and the member terminal 610 are within the coverage of the base station 620, they may obtain sidelink radio configuration information for performing direct communication between the terminals in the group from the base station 620. According to an embodiment of the present invention, the group leader terminal 600 may serve as an auxiliary terminal that obtains sidelink resource information from the base station 620 for the member terminal 610. The member terminal 610 transmits/receives data using the sidelink radio resource allocated by the base station 620 based on the sidelink resource information transmitted through the group leader terminal 600, or communicates with the base station 620. Data may be transmitted/received through the allocated resource by performing a procedure for receiving the sidelink radio resource allocation, or data may be transmitted and received through the allocated resource by selecting a sidelink radio resource by itself. The base station 620 may perform a configuration information exchange procedure with the group leader terminal 600 to set sidelink radio resource information to be used by the member terminal 610.

Referring to FIG. 6B, an embodiment in which a vehicle, an infrastructure, a pedestrian terminal, etc. performs group communication in an intersection area is illustrated. The 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 terminals. The group may be composed of a leader terminal 640 and a member terminal 650. In an embodiment of the present invention, an infrastructure terminal installed at an intersection may be a group leader terminal 640, and a vehicle terminal and a pedestrian terminal located at an intersection may be the member terminal 650. When the group leader terminal 640 and the member terminal 650 are within the coverage of the base station 620, they may obtain sidelink radio configuration information for performing direct communication between the terminals in the group from the base station 620. According to an embodiment of the present invention, the group leader terminal 640 may perform the role of an auxiliary terminal for obtaining sidelink resource information from the base station 620 for the member terminal 650. The member terminal 650 transmits and receives data using the sidelink radio resource allocated by the base station 620 based on the sidelink resource information transmitted through the group leader terminal 640 or communicates with the base station 620. Data may be transmitted/received through the allocated resource by performing a procedure for receiving the sidelink radio resource allocation, or data may be transmitted and received through the allocated resource by selecting a sidelink radio resource by itself. The base station 620 may perform a configuration information exchange procedure with the group leader terminal 640 to set sidelink radio resource information to be used by the member terminal 650.

6C, a configuration for acquiring sidelink radio resource information between a base station 620, UE1 660, and UE2 670 according to various embodiments of the present invention is shown. The base station 620 and the UE1 660 and UE2 670 may exchange control signals and data through Uu interfaces 682 and 684, respectively. UE1 660 and UE2 670 may exchange control signals and data through the sidelink interface 680. According to an embodiment of the present invention, UE1 660 may perform a function of assisting UE2 670 to configure sidelink radio resources. UE1 660 requests sidelink radio resource configuration information of UE2 670 from the base station 620 and obtains sidelink radio resource configuration information of UE2 670 from the base station 620, and the UE2 ( 670).

A terminal supporting the sidelink radio resource setting auxiliary terminal function according to various embodiments of the present disclosure (hereinafter, referred to as an auxiliary terminal) may be pre-designated by a V2X server or a V2X administrator. For example, the platooning reader terminal 600 of FIG. 6A or the infrastructure terminal 640 installed at the intersection of FIG. 6B may be configured to have a function of an auxiliary terminal. An embodiment of a condition in which the auxiliary terminal function is activated may be always activated while the V2X function is activated. Another embodiment of the condition in which the auxiliary terminal function is activated is (1) when it is located in a mode-2 (d) enabling zone (2) when a mode-2 (d) interested V2X application is executed (3) (1) and At least one of the cases in which all conditions of (2) are satisfied may be included. The mode-2(d) enabling zone information may be indicated by at least one of information preset in a V2X server, a base station, and a terminal.

According to an embodiment of the present invention, the Enabling zone configuration information may be delivered to the terminal through NW configured (RRC dedicated or system information), pre-configuration.

As another embodiment, the Enabling zone may be set to be activated for SL bearer or SL flow or SL application.

In the case of a specific SL bearer, the enabling zone can be operated. In addition, enabling zone setting information may be included in the SL bearer configuration information.

In the operation of the terminal processing SL bearer configuration and enabling zone setting, when the setting is obtained, the terminal activates the auxiliary terminal function for the corresponding SL bearer, for example, when the setting is obtained, the terminal is It is possible to activate the mode 2 (d) function for the SL bearer.

Meanwhile, an enabling zone may be operated for a specific SL flow. For example, enabling zone setting information may be included in SL flow setting information. In the operation of the terminal processing SL configuration and enabling zone setting, when the setting is obtained, the terminal activates the auxiliary terminal function for the corresponding SL flow. For example, when the setting is obtained, the terminal is the corresponding SL You can activate the mode 2(d) function for flow.

Alternatively, an enabling zone can be operated for a specific application.

In the upper layer of the terminal (V2X layer or upper layer), application and enabling zone setting mapping information may be delivered to the AS layer. The auxiliary terminal function activation for the application is the same as the example in [Table 1], and the auxiliary terminal function activation setting information based on [Table 1] may be transmitted to the AS layer. In the operation of the terminal processing the SL configuration and enabling zone setting, when the setting is obtained, the terminal activates the auxiliary terminal function for the corresponding SL application.For example, when the setting is obtained, the terminal is the corresponding SL You can activate the mode 2(d) function for an application. An example of 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.

Meanwhile, the mode-2(d) enabling zone may be exemplified by the platooning of FIG. 6(a) or the intersection of FIG. 6(b). The mode-2(d) enabling zone can be operated while platooning is being carried out (eg from departure to arrival). Mode-2(d) enabling zones can be operated for intersections in specific areas. When the auxiliary terminal is located in the mode-2(d) enabling zone, the auxiliary terminal function may be activated.

The mode-2(d) interested V2X application may be indicated by the V2X server or may be preset in the terminal. (Example Table 1)

[Table 1]

Mode-2(d) The determination of the interested V2X application may be performed in the upper layer of the auxiliary terminal. According to the example of [Table 1], the terminal may determine that it is not necessary to support mode-2(d) for the packet of App_A and may not activate the auxiliary terminal function. The terminal determines that it can support mode-2(d) for packets of App_B to App_C, and can activate the auxiliary terminal function.

A terminal (hereinafter, referred to as a target terminal) supporting a function of receiving sidelink radio resource configuration according to various embodiments of the present disclosure may be previously designated by a V2X server or a V2X administrator. For example, the platooning member terminal 610 of FIG. 6A or the vehicle terminal or the pedestrian terminal 650 located at the intersection of FIG. 6B may be set to have a function of a target terminal. According to an embodiment of the present invention, the target terminal function may be activated together while the V2X function is activated. Another embodiment of the condition in which the target terminal function is activated is (1) when it is located in a mode-2 (d) enabling zone (2) when a mode-2 (d) interested V2X application is executed (3) (1) and At least one of the cases in which all conditions of (2) are satisfied may be included. The mode-2(d) enabling zone may be exemplified by the platooning of FIG. 6(a) or the intersection of FIG. 6(b). When the target terminal is located in the mode-2(d) enabling zone, the target terminal function may be activated. The mode-2(d) interested V2X application for activating the target terminal function may be indicated by the V2X server as shown in [Table 1] or may be preset in the terminal. The upper layer of the target terminal may determine whether or not a Mode-2(d) interested V2X application with reference to Table 1 above.

The method of determining that the auxiliary terminal or the target terminal is located in the mode-2(d) enabling zone is (1) mode-2 (d) enabling zone information instructed by the base station or set in the terminal, and of the terminal based on GNSS or GPS. It may be determined by comparing the location coordinates (2) mode-2 (d) enabling zone indicator transmitted from the base station (3) mode-2 (d) enabling zone indicator transmitted from the secondary terminal, or a combination thereof.

Zone setting information that can be used by the auxiliary terminal or the target terminal to determine the mode-2(d) enabling zone may include the following as shown in Table 4 below.

[Table 4]

The auxiliary terminal or the target terminal may calculate its own zone ID as shown in Table 5 below based on the zone setting information.

[Table 5]

For example, the secondary terminal may determine whether the mode-2 (d) enabling zone is included by determining whether the zone ID of the terminal is included in the mode-2 (d) zone ID list transmitted by the base station.

For example, the target terminal may determine whether the mode-2 (d) enabling zone is included by determining whether the zone ID of the target terminal is included in the mode-2(d) zone ID list transmitted by the base station or the auxiliary terminal.

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

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

As another embodiment, the secondary terminal may determine whether the mode-2(d) enabling zone is enabled or disabled by determining whether the mode-2(d) enabling zone indicator is set to enabled or disabled in signaling transmitted by the base station.

As another embodiment, the target terminal may determine whether the mode-2(d) enabling zone is enabled or disabled by determining whether the mode-2(d) enabling zone indicator is set to enabled or disabled in signaling transmitted by the base station or the auxiliary terminal.

According to various embodiments of the present invention, when the mode-2(d) function is activated, the auxiliary terminal 660 may transmit capability information for the mode-2(d) function to the base station 620 through the Uu interface 682. have. If the base station 620 is not transmitting the mode-2 (d) enabling zone indicator, when determining the presence of the secondary terminal 660 having the capability for the mode-2 (d) function mode-2 (d) Can transmit enabling zone indicator. When the mode-2 (d) function is activated, the auxiliary terminal 660 transmits mode-2 (d) function indication information and/or mode-2 (d) enabling zone indicator to the target terminal 670 through the sidelink interface 680. ). An embodiment of the mode-2(d) function indication information and/or mode-2(d) enabling zone indicator transmission/reception procedure through the sidelink interface 680 will be described with reference to FIGS. 8(c) to 8(d) I will do it. When the mode-2(d) function is activated, the auxiliary terminal 660 can determine whether to establish a PC5 RRC unicast connection with the target terminal 670, and if the PC5 RRC unicast connection is not established, the PC5 RRC unicast connection setup procedure is performed. can do.

According to various embodiments of the present invention, when the mode-2(d) function is activated, the target terminal 670 may transmit capability information for the mode-2(d) function to the base station 620 through the Uu interface 684. have. The upper layer (eg, V2X layer, application layer) of the target terminal 670 may instruct the AS layer to activate the mode-2(d) function. When the mode-2(d) function is activated, the target terminal 670 can determine whether to establish a PC5 RRC unicast connection with the auxiliary terminal 660, and if the PC5 RRC unicast connection is not established, the PC5 RRC unicast connection setup procedure is performed. can do.

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

Referring to FIG. 7A, in step 701, the terminal may determine whether the auxiliary terminal function is activated. The auxiliary terminal function activation may be performed when at least one or a combination of the following [Table 2] is satisfied.

[Table 2]

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

The terminal may transmit mode-2(d) function indication information in step 703. The mode-2(d) indicator in step 703 may include a mode-2(d) enabling zone indicator.

In step 704, the terminal may search whether there is a target terminal of mode-2(d). The discovery procedure of the target terminal may correspond to a discovery procedure using a PC5-S signaling message. In the discovery procedure, the PC5-S signaling message transmitted by the terminal corresponds to, for example, a discovery message, and at least one of the destination identifier of the target terminal, an indicator asking whether the target terminal exists, and when the target terminal corresponds to a specific group, It can contain one. 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 including the information. The search response message may include at least one of an identifier of the terminal, an identifier of a target terminal, and a group identifier when the target terminal corresponds to a specific group.

In step 704, if the target terminal of mode-2(d) is searched and there is no PC5 RRC unicast connection establishment with the target terminal, a procedure for establishing a PC5 RRC unicast connection with the target terminal may be performed.

The terminal may collect mode-2(d) information from the target terminal in step 705. The mode-2(d) information collection in step 705 may be performed through the PC5 RRC unicast connection. The mode-2(d) information is information of the V2X application for allocating/setting sidelink radio resources to the target terminal (interest transmission frequency list, interest reception frequency list, unicast destination ID, groupcast destination ID, At least one of QFI, PQI, traffic pattern information, and buffer status information) may be included.

If the auxiliary terminal function is not activated according to the determination in step 701, the terminal may activate the target terminal function. Activation of the target terminal function may be performed when at least one or a combination of the following [Table 3] is satisfied.

[Table 3]

Meanwhile, a discovery procedure using the PC5-S signaling message of step 704 described above may be used for the discovery of the auxiliary terminal. In another embodiment, as a discovery procedure using a PC5-S signaling message, the terminal may transmit a PC5-S signaling message to search for an auxiliary terminal, and the signaling is a destination identifier of the auxiliary terminal, an indicator asking whether there is an auxiliary terminal. , An indicator indicating whether the target terminal exists, and when the target terminal corresponds to a specific group, at least one of a group identifier may be included. The terminal may receive a PC5-S signaling message corresponding to an auxiliary terminal discovery response message from one or more auxiliary terminals, and the auxiliary terminal discovery response message includes at least a target terminal identifier, an auxiliary terminal identifier, and a group identifier to which the target terminal belongs. It can contain one.

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

The terminal may search for an auxiliary terminal in step 707. The presence or absence of the auxiliary terminal may be determined by receiving mode-2(d) function indication information and/or mode-2(d) enabling zone indicator transmitted from the auxiliary terminal.

According to an embodiment, when more than one auxiliary terminal is found, the terminal may select one auxiliary terminal. For example, the terminal may associate PC5 RRC with all discovered auxiliary terminals. For another example, the terminal may connect the PC5 RRC by randomly selecting one auxiliary terminal from among all the found auxiliary terminals. For another example, the terminal selects an auxiliary terminal having the best signal strength (eg, SL RSRP), or selects an auxiliary terminal having the best signal strength (eg, Uu RSRP + SL RSRP), or An auxiliary terminal with the best level (eg, remaining battery capacity) can be selected.

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

The terminal may transmit mode-2(d) support information to the auxiliary terminal in step 708. The mode-2(d) support information may include at least one of a frequency list for transmission of interest, a frequency list for reception of interest, a unicast destination ID, a groupcast destination ID, QFI, PQI, traffic pattern information, and buffer status information. have.

Referring to FIG. 7B, in step 711, the terminal may determine whether the auxiliary terminal function is activated. The auxiliary terminal function activation may be performed when at least one or a combination of [Table 2] is satisfied.

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

The terminal may transmit mode-2(d) function indication information in step 713. The mode-2(d) function indication information in step 713 may include a mode-2(d) enabling zone indicator.

In step 714, the terminal may search for the presence of the target terminal of mode-2(d). The discovery procedure of the target terminal may correspond to a discovery procedure using a PC5-S signaling message. In the discovery procedure, the PC5-S signaling message transmitted by the terminal corresponds to, for example, a discovery message, and at least one of the destination identifier of the target terminal, an indicator asking whether the target terminal exists, and when the target terminal corresponds to a specific group, It can contain one. 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 including the information. The search response message may include at least one of an identifier of the terminal, an identifier of a target terminal, and a group identifier when the target terminal corresponds to a specific group.

In step 714, if the target terminal of mode-2(d) is searched and there is no PC5 RRC unicast connection setup with the target terminal, a PC5 RRC unicast connection setup procedure with the target terminal may be performed.

The terminal may collect mode-2(d) information from the target terminal in step 715. The mode-2(d) information collection in step 715 may be performed through the PC5 RRC unicast connection. The mode-2(d) information is information of the V2X application for allocating/setting sidelink radio resources to the target terminal (interest transmission frequency list, interest reception frequency list, unicast destination ID, groupcast destination ID, At least one of QFI, PQI, traffic pattern information, and buffer status information) may be included.

If the auxiliary terminal function is not activated by the determination in step 711, the terminal may determine whether the target terminal function is activated. Activation of the target terminal function may be performed when at least one or a combination of [Table 3] is satisfied.

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

The terminal may search for an auxiliary terminal in step 718. The presence or absence of the auxiliary terminal may be determined by receiving a mode-2(d) indicator and/or a mode-2(d) enabling zone indicator transmitted by the auxiliary terminal. Meanwhile, a discovery procedure using the above-described PC5-S signaling message in step 714 may be used to search for an auxiliary terminal. In another embodiment, as a discovery procedure using a PC5-S signaling message, the terminal may transmit a PC5-S signaling message to search for an auxiliary terminal, and the signaling is a destination identifier of the auxiliary terminal, an indicator asking whether there is an auxiliary terminal. , An indicator indicating whether the target terminal exists, and when the target terminal corresponds to a specific group, at least one of a group identifier may be included. The terminal may receive a PC5-S signaling message corresponding to an auxiliary terminal discovery response message from one or more auxiliary terminals, and the auxiliary terminal discovery response message includes at least a target terminal identifier, an auxiliary terminal identifier, and a group identifier to which the target terminal belongs. It can contain one. If there is no PC5 RRC unicast connection setup with the secondary terminal, the terminal may perform a PC5 RRC unicast connection setup procedure with the secondary terminal.

The terminal may transmit mode-2(d) support information to the auxiliary terminal in step 719. The mode-2(d) support information may include at least one of a frequency list for transmission of interest, a frequency list for reception of interest, a unicast destination ID, a groupcast destination ID, QFI, PQI, traffic pattern information, and buffer status information. have. According to an embodiment, when more than one auxiliary terminal is found, the terminal may select one auxiliary terminal. For example, the terminal may associate PC5 RRC with all discovered auxiliary terminals. For another example, the terminal may connect the PC5 RRC by randomly selecting one auxiliary terminal from among all the found auxiliary terminals. For another example, the terminal selects an auxiliary terminal having the best signal strength (eg, SL RSRP), or selects an auxiliary terminal having the best signal strength (eg, Uu RSRP + SL RSRP), or An auxiliary terminal with the best level (eg, remaining battery capacity) can be selected.

According to another embodiment of the present invention, when the terminal satisfies (1) support for the auxiliary terminal function among the conditions of [Table 2] in the process of performing steps 701 to 711 of FIG. 7A to 7B, When it is determined that the terminal supporting the function is nearby, the terminal may proceed to steps 706 of FIG. 7A to 716 of FIG. 7B without activating the auxiliary terminal function. The method of determining that the terminal that already supports the auxiliary terminal function is nearby, the terminal is already assisted through the mode-2 (d) indicator and/or the mode-2 (d) enabling zone indicator received from the auxiliary terminal. It may include determining that a terminal supporting the terminal function is nearby.

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

Referring to FIG. 8A, when the terminal 800 has an RRC connection setup with the base station 810, when the terminal 800 receives the UE capability request message of step 801 from the base station 810, the terminal 800 is The link mode-2(d) function support capability may be transmitted to the base station 810 through a UE capability information message in step 802. Sidelink mode-2 (d) function support capability information included in the UE capability information message is mode-2 (d) function indication information, mode-2 (d) auxiliary terminal information, mode-2 (d) target terminal information It may include at least one of.

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

Referring to FIG. 8B, when the terminal 800 has an RRC connection setup with the base station 810, the terminal 800 provides a sidelink mode-2(d) function support capability to the base station 810 with a SidelinkUEInformation message in step 811 Alternatively, it may be transmitted through at least one of a UEAssistanceInformation message or a SLMode2dAssistanceInformation message. The sidelink mode-2 (d) function support capability information includes mode-2 (d) function indication information, mode-2 (d) auxiliary terminal information, mode-2 (d) target terminal information, mode-2 (d) It may include at least one of support information. Mode-2 (d) support information may be included when the secondary terminal transmits the sidelink mode-2 (d) function support capability information to the base station, and the target terminal is the sidelink mode-2 (d) function support capability It may not be included when information is transmitted to the base station. Mode-2(d) support information may include at least one of a frequency list for transmission of interest, a frequency list for reception of interest, a unicast destination ID, a groupcast destination ID, QFI, PQI, traffic pattern information, and buffer status information. . The terminal 800 may transmit to the base station 810 only mode-2 (d) support information in at least one of the SidelinkUEInformation message, the UEAssistanceInformation message, or the SLMode2dAssistanceInformation message, and the base station 810 supports the mode-2 (d). Upon receiving the information, the base station 810 may recognize that the terminal 800 is an auxiliary terminal having mode-2(d) function capability.

The procedures of FIGS. 8A to 8B may correspond to steps 702 in FIG. 7A to steps 712 in FIG. 7B for exchanging capability information between an auxiliary terminal and a base station. The procedures of FIGS. 8A to 8B may correspond to steps 706 in FIG. 7A to steps 717 in FIG. 7B for exchanging capability information between a target terminal and a base station.

Referring to Figure 8c, when the UE1 (800) activates the auxiliary terminal function, the UE1 (800) to the UE2 (860) mode-2 (d) function indication information and / or mode-2 (d) enabling zone indicator Information can be transmitted in step 821. The information in step 821 may be transmitted through at least one of a PC5-RRC unicast control signal, a PC5-RRC groupcast control signal, and a PC5-RRC broadcast control signal. The control signal may be transmitted through at least one of an AS configuration message, UE capability message, SL V2X MIB, SL V2X SIB, PSCCH SCI, and PC5 MAC CE. As another embodiment of the present invention, the information of step 821 may be included in the V2X application message and transmitted. The UE2 860, which has received the information transmitted by the UE1 800 in step 821, recognizes that it is a mode-2(d) enabling zone in step 822, and/or the UE1 800 performs the mode-2(d) function. It can be recognized that it is a supporting auxiliary terminal.

A procedure in which the UE1 800 performs the role of an auxiliary terminal for supporting the mode-2(d) function of the UE2 860 will be described with reference to FIG. 9. In addition, when the UE2 (860) activates the mode-2 (d) function in step 822, the mode-2 (d) function support notification and/or the mode-2 (d) function interest may be notified to the UE1 (800). The procedure will be described with reference to FIGS. 9B to 9E.

9 illustrates a signaling procedure for obtaining information necessary for sidelink resource allocation according to various embodiments of the present disclosure.

Referring to FIG. 9A, when UE2 900 activates the mode-2 (d) function, UE2 900 informs UE1 960 of mode-2 (d) function support and/or mode-2 (d) Functional interest can be communicated in step 901. The operation of step 901 is to receive a mode-2 (d) function support notification and/or mode-2 (d) function interest notification from the UE1 960 according to at least one procedure of FIGS. 9B to 9E, and the UE1 960 ) May be performed when it is determined that it performs the role of a terminal supporting sidelink radio resource allocation and/or configuration. The SL mode2d information message transmitted in step 901 may be transmitted through a PC5 RRC unicast connection between the UE1 960 and the UE2 900. Information included in the SL mode2d information message may include at least one of the following.

● Destination ID (DST ID) corresponding to the application

● Cast type indicator when DST ID is not classified by cast type

● Interested frequency info corresponding to DST ID

● PQI info

● Traffic pattern information (packet transmission period, packet size, priority information, packet transmission offset) when sidelink radio resource allocation of the configured grant type is required

● Terminal identifier (eg, V2X-RNTI)

● Serving cell info (when it is necessary to distinguish a terminal receiving service from another base station)

An example of the ASN.1 structure in the case of including a cast type indicator for distinguishing a cast type corresponding to a DST ID according to various embodiments of the present disclosure is as follows.

Upon receiving the information in step 901, UE1 960 may configure mode-2(d) support information based on information included in the SL mode2d information message and transmit it to the base station 990. The mode-2(d) support information may include information on one or more target terminals for which the UE1 960 supports mode-2(d) function support in addition to the UE2 900.

The Mode-2(d) support information transmitted in step 902 is at least one of a frequency list for transmission of interest, a frequency list for reception of interest, unicast destination ID, groupcast destination ID, QFI, PQI, traffic pattern information, and buffer status information. It can contain one. The UE1 960 may transmit the mode-2(d) support information to the base station 990 by including in at least one of a SidelinkUEInformation message, a UEAssistanceInformation message, or an SLMode2dAssistanceInformation message.

Referring to FIG. 9B, UE1 960 may transmit an AS configuration message including mode-2(d) function indication information and/or mode-2(d) enabling zone indicator to UE2 900 in step 911. . The UE2 900 may transmit a SL mode2d Information message including mode-2 (d) function support notification and/or mode-2 (d) function interest information to the UE1 960 in step 912.

Referring to FIG. 9C, UE1 960 may transmit a UE capability message including mode-2(d) function indication information and/or mode-2(d) enabling zone indicator to UE2 900 in step 921. . UE2 900 may transmit a SL mode2d Information message including mode-2 (d) function support notification and/or mode-2 (d) function interest information to UE1 960 in step 922.

Referring to FIG. 9D, UE1 960 sends a MIB-SL-V2X message including mode-2 (d) function indication information and/or mode-2 (d) enabling zone indicator to UE2 900 in step 931. Can be transmitted. The UE2 900 may transmit an SL mode2d Information message including mode-2 (d) function support notification and/or mode-2 (d) function interest information to the UE1 960 in step 932.

Referring to FIG. 9E, UE1 960 may transmit a V2X application message including mode-2 (d) function indication information and/or mode-2 (d) enabling zone indicator to UE2 900 in step 941. . The UE2 900 may transmit an SL mode2d Information message including mode-2 (d) function support notification and/or mode-2 (d) function interest information to the UE1 960 in step 942.

10 illustrates a signaling procedure for setting sidelink resource allocation information according to various embodiments of the present disclosure.

Referring to FIG. 10A, the base station 1080 is based on the mode-2(d) support information of one or more target terminals 1060 collected through the auxiliary terminal 1000, the side of one or more target terminals 1060. Link radio resource allocation and/or setting may be configured (1001). The mode-2(d) support information collected through the auxiliary terminal 1000 may include information transmitted in step 902 of FIG. 9A.

The base station 1080 may provide sidelink radio resource allocation and/or configuration information of the configured one or more target terminals 1060 to one or more target terminals 1060 through the auxiliary terminal 1000 (1002). . The sidelink radio resource allocation and/or setting information is a sidelink radio resource allocated to the target terminal 1060 or resource setting information used by the target terminal 1060 to request a sidelink radio resource from the base station 1080 Or, the target terminal 1060 may include at least one of resource setting information to be used to directly allocate sidelink radio resources. The detailed procedure of FIG. 10A will be described with reference to FIG. 10B.

Referring to FIG. 10B, the base station 1080 may transmit an RRC Reconfiguration message including sidelink radio resource allocation and/or configuration information for one or more target terminals 1060 to the auxiliary terminal 1000 in step 1011. . The message may be a system information block (SIB) message. The information transmitted in step 1011 is a destination ID list that provides radio resource allocation and/or configuration information for each target terminal 1060, sidelink radio resource pool information, sidelink radio resource allocation information, and sidelink radio resource request. It may include at least one of configuration information required for, mode 1 allocation and/or mode 2 allocation information, and sidelink feedback transmission resource configuration information. The configuration information may include at least one of SL bearer information, SL logical channel group information, and SL logical channel ID. Mode 1 allocation information may include at least one of configured grant type 1 to configured grant type 2 to dynamic grant. The mode 2 allocation information may include at least one of a sidelink radio resource pool and sidelink radio resource sensing configuration information. The auxiliary terminal 1000 may transmit an RRC configuration complete message to the base station 1080 in step 1012 as a response to the RRC configuration message. The auxiliary terminal 1000 transmits an SL mode2d configuration message including sidelink radio resource allocation and/or configuration information for one or more target terminals 1060 received in the RRC configuration message in step 1013, and the target terminal 1060 Can be sent to One or more target terminals 1060 may transmit an SL mode2d configuration complete message to the auxiliary terminal 1000 in step 1014 as a response to the SL mode2d configuration message. The one or more target terminals 1060 may perform sidelink radio resource allocation based on the received sidelink radio resource allocation and/or configuration information in step 1015.

When the one or more target terminals 1060 are allocated sidelink resources from the base station 1080 (which may include packet transmission resources and HARQ feedback resources), V2X packet transmission/reception can be performed using the acquired resources. have. If the one or more target terminals 1060 receive mode 1 resource configuration information from the base station 1080, that is, the resource configuration information may correspond to the case that SR configuration or configuration required for SL-BSR transmission is received. , The target terminal 1060 may perform V2X packet transmission/reception by receiving a sidelink radio resource allocation based on the resource configuration information. When the one or more target terminals 1060 receive configuration information for configured grant type 1 or configured grant type 2 of mode 1 resource configuration information from the base station 1080, the target terminal 1060 is the It is possible to perform V2X packet transmission and reception by receiving sidelink radio resources based on the configured grant type 1 configuration information to the configured grant type 2 configuration information. When the one or more target terminals 1060 receive mode2 resource setting information from the base station 1080, that is, sidelink radio resource pool or sensing setting information, the target terminal 1060 may perform sidelink based on the resource setting information. It is possible to perform V2X packet transmission and reception by receiving radio resources by itself. In the embodiment of FIG. 10B, the target terminal 1060 may or may not establish an RRC connection with the 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 are cases where it is designated to transmit HARQ feedback for each V2X application required by each target terminal, and there are cases where it is designated that there is no need to transmit HARQ feedback. For a case designated to transmit HARQ feedback, the base station may allocate HARQ feedback transmission resources or configure configuration information for HARQ feedback transmission resources. As an embodiment, the auxiliary terminal may include HARQ feedback enabled/disabled indication information for the service of each target terminal in mode-2(d) support 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 the HARQ feedback enabled/disabled indication information for the service of each target terminal.

In another embodiment, when the secondary terminal transmits mode-2(d) support information of one or more target terminals to the base station, the HARQ feedback information may not be separately included for the 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. The configuration information may include at least one of SL bearer information, SL logical channel group information, and SL logical channel ID. In this case, when the cast type corresponding to the service of each target terminal is set to unicast or groupcast, the base station may configure HARQ feedback transmission resource allocation and/or configuration information based on this. Each target terminal may determine a HARQ feedback resource 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 groupcast, the target terminal may be allocated HARQ feedback transmission resource based on the information. For another example, if the base station does not provide HARQ feedback transmission resource allocation and/or configuration information, the target terminal may allocate HARQ feedback transmission resource by itself. For another example, if 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 by applying the same packet transmission resource allocation and/or configuration information corresponding to the service. . For another example, if the base station does not provide HARQ feedback transmission resource allocation and/or configuration information, the target terminal may be allocated HARQ feedback transmission resource based on a predefined HARQ feedback transmission resource.

A method for distinguishing a sidelink resource allocation request for transmitting a PC5 RRC control message and a sidelink resource allocation request for transmitting a PC5 data message according to various embodiments of the present invention will be described. For example, if the base station operates a mode in which sidelink radio resources are allocated according to the existing method, there is no way to distinguish between the resource request for PC5 RRC control message transmission and the resource request for PC5 data message transmission. It cannot support transmission differentiation of data messages, and there is no way to distinguish control messages or data messages that need to be transmitted first. The method for distinguishing between the PC5 RRC control message and the PC5 data message proposed in the present invention may be at least one or a combination of the following.

(1) PC5-RRC control message indicator / PC5 data message indicator defined separately

(2) Defined by dividing the PQI value corresponding to the PC5-RRC control message and the PQI value corresponding to the PC5 data message

(3) Defined by classifying the QFI value corresponding to the PC5-RRC control message and the QFI value corresponding to the PC5 data message

(4) Defined by separating priority value corresponding to PC5-RRC control message and priority value corresponding to PC5 data message

(5) Defined by distinguishing destination ID corresponding to PC5-RRC control message and destination ID corresponding to 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. (For example, if the SidelinkUEInformation message contains a DST ID, it is for a PC5 data message, and if the SidelinkUEInformation message does not contain a DST ID, it is for a PC5 RRC control message)

(7) Separately defined SR (scheduling request) configuration for PC5 RRC control message transmission and SR configuration for PC5 data message transmission

Various examples of ASN.1 structure for scheme (1)

Example of ASN.1 structure for Option (6)

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

(1) In case of operating the base station scheduling mode (mode 1)

When the terminal requests a sidelink radio resource required for transmission of a PC5 RRC control message or a PC5 data message, the terminal transmits a sidelink radio resource allocation request message to the base station using at least one or a combination of the above-described schemes (1) to (6). I can.

The base station receiving a sidelink radio resource request from the terminal at least one of the schemes (1) to (6) or a combination thereof, as in scheme (7), the SR configuration for the PC5 RRC control message and the SR configuration for the PC5 data message. Can be assigned separately. A base station that receives a sidelink radio resource request from the terminal in at least one of the schemes (1) to (6) or a combination is allocated by classifying the SL resource pool for the PC5 RRC control message and the SL resource pool for the PC5 data message. can do.

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

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

According to another embodiment of the present invention, the base station has a Uu SR configuration for message transmission that triggers a sidelink radio resource request for a PC5 RRC control message and a Uu SR configuration for message transmission that triggers a sidelink radio resource request for a PC5 data message. Can be assigned separately. For example, an SR configuration transmitting a SidelinkUEInformation message including information on a PC5 RRC control message and an SR configuration transmitting a SidelinkUEInformation message including information on a PC5 data message may be distinguished.

When the terminal has room in the sidelink radio resource allocated for transmission of the PC5 RRC control message, it can transmit the PC5 data message. On the contrary, if the terminal has enough sidelink radio resources allocated for transmission of PC5 data messages, it can transmit the PC5 RRC control message.

(2) In case of operating terminal direct allocation mode (mode 2)

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

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

According to another embodiment of the present invention, when there is no distinction 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 according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (electrically erasable programmable read only memory, EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs (DVDs) or other forms of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is through a communication network composed of a communication network such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or a storage area network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the above-described specific embodiments of the present disclosure, components included in the disclosure are expressed in the singular or plural according to the presented specific embodiments. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is limited to the described embodiments and should not be determined, and should be determined by the scope of the claims as well as the equivalents of the claims to be described later.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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