KR20200114365A - A method and apparatus for transmitting message in state transition of a terminal in wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5^th generation (5G) communication system with an Internet of things (IoT) technology to support a higher data transmission rate than that of a 4^th generation (4G) system and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. According to the present invention, disclosed is an operation of a terminal and a base which transmits and receives a message when the terminal transitions. According to the present invention, a control signal processing method in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the first control signal received; and transmitting a second control signal generated based on the processing to the base station.

Description

[A method and apparatus for transmitting message in state transition of a terminal in wireless communication system}

The present disclosure relates to an operation of a terminal and a base station that transmits and receives a message when a terminal transitions in a wireless communication system.

More specifically, when the terminal transitions from the radio resource control inactive (RRC_INACTIVE) state to the radio resource control connected (RRC_CONNECTED) state to support vehicle communication in the next-generation mobile communication system, the side of the terminal It relates to a method and apparatus for transmitting and receiving a link terminal information (SidelinkUEInformation) message.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, 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 array multiple input/output (MIMO), and full dimensional multiple input/output (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 (D1d), 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, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered network in which humans create and consume information, to an IoT (Internet of Things, Internet of Things) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technological 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 values 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. There is. The application of a cloud radio access network (cloud RAN) as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

In the next-generation mobile communication system, an RRC inactive mode (RRC_INACTIVE) can be newly defined.When the RRC inactive mode terminal tries to reconnect to the network, there is a method that can access faster and transmit and receive data with less signaling procedures. Is required.

The present disclosure proposes an RRC connection resumption procedure in which a terminal can transition from an RRC inactive mode to an RRC connected mode in a wireless communication system.

The present disclosure proposes an RRC connection resumption procedure in which a terminal attempts to access a network in an RRC deactivation mode in a wireless communication system, accesses faster with a smaller signaling procedure and transmits and receives data.

The present disclosure proposes a method and apparatus for transmitting sidelink terminal information when a terminal transitions from an RRC deactivation mode to an RRC connected mode in a wireless communication system.

The present invention provides a control signal processing method in a wireless communication system, the method comprising: receiving a first control signal transmitted from a network entity; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the network entity.

In the message transmission/reception method according to the present disclosure, when a terminal performs a state transition from an RRC deactivation mode to an RRC connection mode in a wireless communication system, it is possible to access a network faster and transmit and receive data with a smaller signaling procedure.

1 is a diagram illustrating a structure of an LTE system according to various embodiments of the present disclosure.
2 is a diagram illustrating a radio protocol structure in an LTE system according to various embodiments of the present disclosure.
3 is a diagram illustrating a structure of a next-generation mobile communication system according to various embodiments of the present disclosure.
4 is a diagram illustrating a radio protocol structure of a next generation mobile communication system according to various embodiments of the present disclosure.
5 is a diagram illustrating V2X communication in a next-generation mobile communication system according to various embodiments of the present disclosure.
6 is a procedure in which the base station releases the connection of the terminal and the terminal switches from the RRC connection mode (RRC_CONNECTED) to the RRC idle mode (RRC_IDLE), and the terminal establishes a connection with the base station according to various embodiments of the present disclosure. A diagram for explaining a procedure for switching from an idle mode (RRC_IDLE) to an RRC connection mode (RRC_CONNECTED).
7 is a procedure in which the base station releases the connection of the terminal so that the terminal switches from the RRC connection mode (RRC_CONNECTED) to the RRC inactive mode (RRC_INACTIVE), and the terminal resumes connection with the base station according to various embodiments of the present disclosure. This is a diagram for explaining a procedure for switching from an inactive mode (RRC_INACTIVE) to an RRC connection mode (RRC_CONNECTED).
FIG. 8 is a diagram illustrating a terminal operation for a terminal transitioning from an RRC idle mode to an RRC connected mode to transmit a SidelinkUEInformation message to a base station according to various embodiments of the present disclosure.
9 is a diagram illustrating a terminal operation for a terminal transitioning from an RRC idle mode to an RRC connected mode to transmit a SidelinkUEInformation message to a base station according to various embodiments of the present disclosure.
10A is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.
10B is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.
11A is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.
FIG. 11B is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.
12 illustrates a structure of a terminal according to various embodiments of the present disclosure.
13 illustrates a structure of a base station according to various embodiments of the present disclosure.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present disclosure complete, and common knowledge in the technical field to which the disclosure belongs. It is provided to completely inform the scope of the invention to those who have it, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

In this case, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for instructions to perform processing equipment to provide steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, functions mentioned in blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order depending on the corresponding function.

In this case, the term'~ unit' used in this embodiment refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and'~ unit' performs certain roles. do. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Thus, as an example,'~ unit' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, and procedures. , Subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, database, data structures, tables, arrays, and variables. The components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further divided into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. Also, in an embodiment, the'~ unit' may include one or more processors.

Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

For convenience of description below, this disclosure uses terms and names defined in the 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) standard. However, the present disclosure is not limited by the terms and names, and may be equally applied to systems conforming to other standards.

A term for identifying an access node used in the following description, a term for network entities, a term for messages, a term for an interface between network objects, a term for various identification information And the like are illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described later, and other terms referring to objects having an equivalent technical meaning may be used. For example, in the following description, a terminal may refer to a MAC entity in a terminal that exists for each master cell group (MCG) and a secondary cell group (SCG) to be described later.

Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, it is not limited to the above example.

In particular, the present disclosure can be applied to 3GPP NR (5th generation mobile communication standard). In addition, the present disclosure is based on 5G communication technology and IoT-related technology, intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety related services Etc.). In the present invention, the eNB may be used interchangeably with gNB for convenience of description. That is, a base station described as an eNB may represent a gNB. In addition, the term terminal may refer to mobile phones, NB-IoT devices, sensors as well as other wireless communication devices.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced. (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is developing into a communication system.

As a representative example of a broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme for downlink (DL) and Single Carrier Frequency Division Multiplexing (SC-FDMA) for uplink (UL) in the LTE system. ) Method is adopted. Uplink refers to a radio link through which a terminal (UE; User Equipment or MS; Mobile Station) transmits data or control signals to a base station (eNode B or BS; Base Station), and downlink refers to a base station for data or control to the terminal. It means a radio link that transmits a signal. The multiple access method as described above divides the data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap each other, that is, orthogonality is established. .

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, services that simultaneously satisfy various requirements must be supported. Services considered for the 5G communication system include Enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). There is this.

According to some embodiments, the eMBB may aim to provide a more improved data transmission rate than the data transmission rate supported by the existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a maximum transmission rate of 20 Gbps in downlink and 10 Gbps in uplink from the viewpoint of one base station. In addition, the 5G communication system may be required to provide a maximum transmission rate and at the same time provide an increased user perceived data rate of the terminal. In order to satisfy such a requirement, in a 5G communication system, it may be required to improve various transmission/reception technologies including a more advanced multi-antenna (MIMO) transmission technology. In addition, signals are transmitted using a maximum 20MHz transmission bandwidth in the current 2GHz band used by LTE, whereas the 5G communication system uses a wider frequency bandwidth than 20MHz in a frequency band of 3~6GHz or 6GHz or higher. It can satisfy the data transmission speed.

At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC may require large-scale terminal access support within a cell, improved terminal coverage, improved battery time, and reduced terminal cost. The IoT is attached to various sensors and various devices to provide a communication function, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. In addition, because the terminal supporting mMTC is highly likely to be located in a shadow area not covered by the cell, such as the basement of a building due to the characteristics of the service, a wider coverage may be required compared to other services provided by the 5G communication system. A terminal supporting mMTC should be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, as a cellular-based wireless communication service used for a specific purpose (mission-critical), remote control for robots or machinery, industrial automation, and It can be used for services such as unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC may have to provide very low latency (ultra low latency) and very high reliability (ultra reliability). For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time may have a requirement of a packet error rate of 10-5 or less. Therefore, for a service that supports URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is designed to allocate a wide resource in the frequency band to secure the reliability of the communication link. Requirements may be required.

Three services considered in the aforementioned 5G communication system, namely eMBB, URLLC, and mMTC, may be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service. However, the aforementioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described example.

In addition, the embodiments of the present invention are described below as an example of an LTE, LTE-A, LTE Pro or 5G (or NR, next-generation mobile communication) system, but the present invention is also applied to other communication systems having a similar technical background or channel type. An embodiment of can be applied. In addition, the embodiments of the present invention may be applied to other communication systems through some modifications without significantly departing from the scope of the present invention, as determined by a person having skilled technical knowledge.

1 is a diagram illustrating a structure of an LTE system according to various embodiments of the present disclosure.

As shown in Figure 1, the radio access network of the LTE system is a next-generation base station (Evolved Node B, hereinafter ENB, Node B or base station) (1a-05, 1a-10, 1a-15, 1a-20) and MME ( 1a-25, Mobility Management Entity) and S-GW (1a-30, Serving-Gateway). User Equipment (hereinafter, UE or terminal) 1a-35 accesses an external network through ENBs 1a-05 to 1a-20 and S-GW 1a-30.

In FIG. 1, ENBs 1a-05 to 1a-20 correspond to an existing Node B of a Universal Mobile Telecommunication System (UMTS) system. The ENB is connected to the UEs 1a-35 through a radio channel and performs a more complex role than the existing Node B. In the LTE system, all user traffic including real-time services such as VoIP (Voice over IP) through the Internet protocol are serviced through a shared channel, so status information such as buffer status, available transmission power status, and channel status of UEs A device for collecting and scheduling may be required, and ENBs 1a-05 to 1a-20 may be in charge of this. One ENB typically controls a plurality of cells. For example, in order to implement a transmission rate of 100 Mbps, the LTE system may use orthogonal frequency division multiplexing (OFDM) in a 20 MHz bandwidth as a radio access technology. Of course, it is not limited to the above example. In addition, ENBs 1a-05 to 1a-20 are also referred to as Adaptive Modulation & Coding (AMC) for determining a modulation scheme and a channel coding rate according to the channel state of the terminal. ) Method can be applied. The S-GW (Serving GateWay) 1a-30 is a device that provides a data bearer, and creates or removes a data bearer under the control of the Mobility Management Entity (MME) 1a-25. The MME is a device in charge of various control functions as well as mobility management functions for a terminal, and is connected to a plurality of base stations.

2 is a diagram illustrating a radio protocol structure in an LTE system according to various embodiments of the present disclosure.

2, the radio protocol of the LTE system is PDCP (Packet Data Convergence Protocol 1b-05, 1b-40), RLC (Radio Link Control 1b-10, 1b-35), MAC (Medium Access Control 1b-15, 1b-30). PDCP (Packet Data Convergence Protocol) (1b-05, 1b-40) can perform operations such as IP header compression/restore. The main functions of PDCP are summarized as follows. Of course, it is not limited to the following examples.

- 헤더 압축 및 압축 해제 기능(Header compression and decompression: ROHC only)

-Header compression and decompression (ROHC only)

- 사용자 데이터 전송 기능 (Transfer of user data)

-Transfer of user data

- 순차적 전달 기능(In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM)

-In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

- 순서 재정렬 기능(For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

-Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

- 중복 탐지 기능(Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM)

-Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM

- 재전송 기능(Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

-Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM

- 암호화 및 복호화 기능(Ciphering and deciphering)

-Encryption and decryption function (Ciphering and deciphering)

- 타이머 기반 SDU 삭제 기능(Timer-based SDU discard in uplink.)

-Timer-based SDU discard in uplink.

Radio Link Control (hereinafter referred to as RLC) (1b-10, 1b-35) may perform an ARQ operation by reconfiguring a PDCP packet data unit (PDU) to an appropriate size. The main functions of RLC are summarized as follows. Of course, it is not limited to the following examples.

- 데이터 전송 기능(Transfer of upper layer PDUs)

-Data transfer function (Transfer of upper layer PDUs)

- ARQ 기능(Error Correction through ARQ (only for AM data transfer))

-ARQ function (Error Correction through ARQ (only for AM data transfer))

- 접합, 분할, 재조립 기능(Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer))

-Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

- 재분할 기능(Re-segmentation of RLC data PDUs (only for AM data transfer))

-Re-segmentation of RLC data PDUs (only for AM data transfer)

- 순서 재정렬 기능(Reordering of RLC data PDUs (only for UM and AM data transfer)

-Reordering of RLC data PDUs (only for UM and AM data transfer)

- 중복 탐지 기능(Duplicate detection (only for UM and AM data transfer))

-Duplicate detection (only for UM and AM data transfer)

- 오류 탐지 기능(Protocol error detection (only for AM data transfer))

-Error detection function (Protocol error detection (only for AM data transfer))

- RLC SDU 삭제 기능(RLC SDU discard (only for UM and AM data transfer))

-RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

- RLC 재수립 기능(RLC re-establishment)

-RLC re-establishment

The MACs 1b-15 and 1b-30 are connected to several RLC layer devices configured in one terminal, and may perform an operation of multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows. Of course, it is not limited to the following examples.

- 맵핑 기능(Mapping between logical channels and transport channels)

-Mapping between logical channels and transport channels

- 다중화 및 역다중화 기능(Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels)

-Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels

- 스케쥴링 정보 보고 기능(Scheduling information reporting)

-Scheduling information reporting function

- HARQ 기능(Error correction through HARQ)

-HARQ function (Error correction through HARQ)

- 로지컬 채널 간 우선 순위 조절 기능(Priority handling between logical channels of one UE)

-Priority handling between logical channels of one UE

- 단말간 우선 순위 조절 기능(Priority handling between UEs by means of dynamic scheduling)

-Priority handling between UEs by means of dynamic scheduling

- MBMS 서비스 확인 기능(MBMS service identification)

-MBMS service identification

- 전송 포맷 선택 기능(Transport format selection)

-Transport format selection

- 패딩 기능(Padding)

-Padding function

The physical layer (1b-20, 1b-25) channel-codes and modulates upper layer data, converts it into OFDM symbols, and transmits it to the radio channel, or demodulates OFDM symbols received through the radio channel and decodes the channel and delivers it to the upper layer. Do the action. Of course, it is not limited to the above example.

3 is a diagram illustrating a structure of a next-generation mobile communication system according to various embodiments of the present disclosure.

As shown in Figure 3, the radio access network of the next-generation mobile communication system (hereinafter NR or 2g) is a next-generation base station (New Radio Node B, hereinafter NR gNB or NR base station) (1c-10) and NR CN (1c-05). , New Radio Core Network). The user terminal (New Radio User Equipment, hereinafter referred to as NR UE or terminal) 1c-15 accesses the external network through the NR gNB 1c-10 and NR CN 1c-05.

In FIG. 3, the NR gNB 1c-10 corresponds to an evolved node B (eNB) of an existing LTE system. The NR gNB is connected to the NR UE 1c-15 through a radio channel and can provide a service superior to that of the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device that collects and schedules status information such as buffer status, available transmission power status, and channel status of UEs may be required. NB(1c-10) is in charge. One NR gNB typically controls multiple cells. According to an embodiment of the present disclosure, in a next-generation mobile communication system, in order to implement ultra-high-speed data transmission compared to current LTE, it may have more than an existing maximum bandwidth, and an orthogonal frequency division multiplexing scheme (hereinafter referred to as OFDM) is used. Beamforming technology can be additionally used as a wireless access technology. In addition, according to an embodiment of the present disclosure, the NR gNB (1c-10) determines a modulation scheme and a channel coding rate according to the channel state of the terminal. , Hereinafter referred to as AMC) method can be applied. The NR CN 1c-05 may perform functions such as mobility support, bearer configuration, and QoS configuration. The NR CN (1c-05) is a device responsible for various control functions as well as a mobility management function for a terminal, and may be connected to a plurality of base stations. In addition, the next-generation mobile communication system can be linked to an existing LTE system, and the NR CN (1c-05) is connected to the MME (1c-25) through a network interface. The MME may be connected to the eNB 1c-30, which is an existing base station.

4 is a diagram illustrating a radio protocol structure of a next-generation mobile communication system according to an embodiment of the present disclosure.

4, the radio protocol of the next-generation mobile communication system is NR SDAP (1d-01, 1d-45), NR PDCP (1d-05, 1d-40), NR RLC (1d-10) in the terminal and NR base station, respectively. , 1d-35), and NR MAC (1d-15, 1d-30).

According to an embodiment of the present disclosure, the main functions of the NR SDAPs 1d-01 and 1d-45 may include some of the following functions. Of course, it is not limited to the following examples.

- 사용자 데이터의 전달 기능(transfer of user plane data)

-Transfer of user plane data

- 상향 링크와 하향 링크에 대해서 QoS flow와 데이터 베어러의 맵핑 기능(mapping between a QoS flow and a DRB for both DL and UL)

-Mapping between a QoS flow and a DRB for both DL and UL for uplink and downlink

- 상향 링크와 하향 링크에 대해서 QoS flow ID를 마킹 기능(marking QoS flow ID in both DL and UL packets)

-Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

- 상향 링크 SDAP PDU들에 대해서 relective QoS flow를 데이터 베어러에 맵핑시키는 기능 (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

-A function of mapping a relective QoS flow to a data bearer for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

For SDAP layer devices, the terminal uses a radio resource control (RRC) message, whether to use the header of the SDAP layer device or whether to use the function of the SDAP layer device for each PDCP layer device, for each bearer, or for each logical channel. Can be set. When the SDAP header is set, the UE uses the NAS QoS reflective configuration 1-bit indicator (NAS reflective QoS) and AS QoS reflective configuration 1-bit indicator (AS reflective QoS) in the SDAP header to enable the UE to provide uplink and downlink QoS flow and data bearer. It can be instructed to update or reset the mapping information for. The SDAP header may include QoS flow ID information indicating QoS. In addition, according to an embodiment of the present disclosure, QoS information may be used as data processing priority, scheduling information, and the like for supporting smooth service.

According to an embodiment of the present disclosure, the main functions of the NR PDCP (1d-05, 1d-40) may include some of the following functions. Of course, it is not limited to the following examples.

Header compression and decompression (ROHC only)

- 사용자 데이터 전송 기능 (Transfer of user data)

-Transfer of user data

- 순차적 전달 기능(In-sequence delivery of upper layer PDUs)

-In-sequence delivery of upper layer PDUs

- 비순차적 전달 기능 (Out-of-sequence delivery of upper layer PDUs)

-Out-of-sequence delivery of upper layer PDUs

- 순서 재정렬 기능(PDCP PDU reordering for reception)

-Order reordering function (PDCP PDU reordering for reception)

- 중복 탐지 기능(Duplicate detection of lower layer SDUs)

-Duplicate detection of lower layer SDUs

- 재전송 기능(Retransmission of PDCP SDUs)

-Retransmission of PDCP SDUs

- 암호화 및 복호화 기능(Ciphering and deciphering)

-Encryption and decryption function (Ciphering and deciphering)

- 타이머 기반 SDU 삭제 기능(Timer-based SDU discard in uplink.)

-Timer-based SDU discard in uplink.

According to an embodiment of the present disclosure, the reordering function of the NR PDCP device may mean a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN). The order rearrangement function of the NR PDCP device is the function of delivering data to the upper layer in the order in which they are rearranged, the function to directly deliver the data without considering the order, the function to record the lost PDCP PDUs by rearranging the order, and the lost PDCP PDUs It may include at least one of a function of sending a status report to the transmission side and a function of requesting retransmission of lost PDCP PDUs.

According to an embodiment of the present disclosure, the main functions of the NR RLCs 1d-10 and 1d-35 may include some of the following functions. However, it is not limited to the following examples.

- 데이터 전송 기능(Transfer of upper layer PDUs)

-Data transfer function (Transfer of upper layer PDUs)

- 순차적 전달 기능(In-sequence delivery of upper layer PDUs)

-In-sequence delivery of upper layer PDUs

- 비순차적 전달 기능(Out-of-sequence delivery of upper layer PDUs)

-Out-of-sequence delivery of upper layer PDUs

- ARQ 기능(Error Correction through ARQ)

-ARQ function (Error Correction through ARQ)

- 접합, 분할, 재조립 기능(Concatenation, segmentation and reassembly of RLC SDUs)

-Concatenation, segmentation and reassembly of RLC SDUs

- 재분할 기능(Re-segmentation of RLC data PDUs)

-Re-segmentation of RLC data PDUs

- 순서 재정렬 기능(Reordering of RLC data PDUs)

-Reordering of RLC data PDUs

- 중복 탐지 기능(Duplicate detection)

-Duplicate detection

- 오류 탐지 기능(Protocol error detection)

-Protocol error detection

- RLC SDU 삭제 기능(RLC SDU discard)

-RLC SDU discard function (RLC SDU discard)

- RLC 재수립 기능(RLC re-establishment)

-RLC re-establishment

According to an embodiment of the present disclosure, in-sequence delivery of an NR RLC device may mean a function of sequentially delivering RLC SDUs received from a lower layer to a higher layer. When one RLC SDU is originally divided into multiple RLC SDUs and received, a function to reassemble and deliver them, and a function to rearrange the received RLC PDUs based on an RLC sequence number (SN) or a PDCP sequence number (SN). , The function of reordering the order to record the lost RLC PDUs, the function of reporting the status of the lost RLC PDUs to the sender, the function of requesting retransmission of the lost RLC PDUs, when there is a lost RLC SDU , The function of delivering only RLC SDUs before the lost RLC SDU to the upper layer in order, and if a predetermined timer expires even if there is a lost RLC SDU, all RLC SDUs received before the timer starts are delivered to the upper layer in order And a function of transmitting all RLC SDUs received so far to an upper layer in order if a predetermined timer expires even if there is a lost RLC SDU.

In addition, according to an embodiment of the present disclosure, the NR RLC device processes RLC PDUs in the order in which they are received (regardless of the order of serial numbers and sequence numbers, in the order of arrival), and sends them to the PDCP device regardless of the order (Out- of sequence delivery), and in the case of a segment, segments stored in a buffer or to be received at a later time may be received, reconstructed into one complete RLC PDU, processed, and delivered to the PDCP device.

In addition, according to an embodiment of the present disclosure, the NR RLC layer may not include a concatenation function and may be performed in the NR MAC layer or may be replaced with a multiplexing function of the NR MAC layer.

In addition, according to an embodiment of the present disclosure, the out-of-sequence delivery function of the NR RLC device refers to a function of directly delivering RLC SDUs received from a lower layer to a higher layer regardless of the order. When one RLC SDU is divided into multiple RLC SDUs and received, the function to reassemble and deliver them, the function to store the RLC SN or PDCP SN of the received RLC PDUs and arrange the order to record the lost RLC PDUs It may include at least one of.

According to an embodiment of the present disclosure, the NR MAC (1d-15, 1d-30) may be connected to several NR RLC layer devices configured in one terminal, and the main functions of the NR MAC include some of the following functions. can do. Of course, it is not limited to the following examples.

- 맵핑 기능(Mapping between logical channels and transport channels)

-Mapping between logical channels and transport channels

- 다중화 및 역다중화 기능(Multiplexing/demultiplexing of MAC SDUs)

-Multiplexing and demultiplexing function (Multiplexing/demultiplexing of MAC SDUs)

- 스케쥴링 정보 보고 기능(Scheduling information reporting)

-Scheduling information reporting function

- HARQ 기능(Error correction through HARQ)

-HARQ function (Error correction through HARQ)

- 로지컬 채널 간 우선 순위 조절 기능(Priority handling between logical channels of one UE)

-Priority handling between logical channels of one UE

- 단말간 우선 순위 조절 기능(Priority handling between UEs by means of dynamic scheduling)

-Priority handling between UEs by means of dynamic scheduling

- MBMS 서비스 확인 기능(MBMS service identification)

-MBMS service identification

- 전송 포맷 선택 기능(Transport format selection)

-Transport format selection

- 패딩 기능(Padding)

-Padding function

According to an embodiment of the present disclosure, the NR PHY layer (1d-20, 1d-25) channel-codes and modulates upper layer data, makes OFDM symbols, and transmits them through a wireless channel, or OFDM symbols received through a wireless channel. It is possible to perform an operation of demodulating, channel decoding, and transmitting the data to an upper layer. Of course, it is not limited to the above example.

5 is a diagram illustrating V2X communication in a next-generation mobile communication system according to various embodiments of the present disclosure.

V2X (vehicle-to-everything) according to an embodiment of the present disclosure collectively refers to a communication technology through a vehicle and all interfaces, and according to the form and communication components, V2V (vehicle-to-vehicle) , V2I (vehicle-to-intrastructure), V2P (vehicle-to-pedestrian), V2N (vehicle-to-network), and the like.

5, a base station 1e-01 includes at least one vehicle terminal 1e-05, 1e-10, a pedestrian portable terminal 1e-15, and V2X located in a cell 1e-02 supporting V2X. Cellular communication can be performed. At this time, V2X can be supported through the Uu interface and/or the PC5 interface. When supporting V2X through the Uu interface, as an example, the vehicle terminals 1e-05 and 1e-10 have an uplink (UL)/Downlink (DL) between the base station 1e-01 and the vehicle terminal-base station, 1e-30, 1e-35) to perform V2X cellular communication, or the pedestrian mobile terminal (1e-15) uses V2X cellular communication using the up-down link (UL/DL, 1e-40) between the pedestrian terminal and the base station. Can be done. When V2X is supported through the PC5 interface, V2X sidelink (SL) communication can be performed using a terminal-to-terminal link (Sidelink (SL), 1e-20, 1e-25). For example, the vehicle terminal 1e-05 present in the coverage of the base station (in coverage of E-UTRA/NR) is other vehicle terminals 1e-10 and 1e-45 and/or the pedestrian portable terminal 1e-15, 1e-55) and sidelinks (SL, 1e-20, 1e-50, 1e-25, 1e-60), which are transport channels, can transmit and receive V2X packets. The V2X packets may be transmitted and received in a broadcast transmission type and/or a unicast and/or groupcast transmission type.

A terminal supporting V2X sidelink communication may transmit and receive V2X packets through a resource allocation mode (scheduled resource allocation or UE autnomous resource selection). Scheduled resource allocation (mode 1 and/or mode 3) is a mode in which the base station allocates resources used for sidelink transmission to the RRC connected mode terminal in a dedicated scheduling scheme. This mode can be efficient for interference management and/or resource pool management (dynamic allocation, semi-persistence transmission) because the base station can manage sidelink resources. When there is data to be transmitted to other terminal(s), the RRC connected mode terminal may inform the base station of the existence of data to be transmitted to the other terminal(s) using an RRC message or a MAC control element (CE). As an example, the RRC message may be a sidelink terminal information (SidelinkUEInformation) message or a terminal support information (UEAssistanceInformation) message, and the like, and the MAC CE may be used to report a buffer status of a new format, such as MAC CE. For example, the buffer status report MAC CE may include at least an indicator indicating that the buffer status report is for V2X communication and information on the size of data buffered for sidelink communication. In UE autonomous resource selection (mode 2 and/or mode 4), the base station provides sidelink resource information/pool as system information and/or RRC message to the terminal supporting V2X sidelink communication, and the terminal is determined. In this mode, resources are selected according to rules. As an example, the base station may provide sidelink resource information to the terminal by signaling SIBx to be newly defined for the SIB21, SIB26, or NR V2X terminal.

In addition, the base station may provide sidelink resource information to the terminal by signaling an RRC message to the terminal. For example, the base station may provide sidelink resource information by signaling an RRC connection reconfiguration message (RRCReconfiguration message) and/or a connection resumption message (RRCResume message) to the terminal to the terminal. In addition, UE autonomous resource selection helps the terminal to select the resource used for the sidelink through PC5-RRC message and/or MAC CE to other terminal(s), or direct or indirectly to the sidelink transmission through scheduling. You can also allocate the resources used. That is, the UE autonomous resource selection mode may refer to one or more of the following.

- UE autonomously selects sidelink resource for transmission

-UE autonomously selects sidelink resource for transmission

- UE assists sidelink resource selection for other UEs

-UE assists sidelink resource selection for other UEs

- UE is configured with NR configured grant for sidelink transmission

-UE is configured with NR configured grant for sidelink transmission

- UE schedules sidelink transmission of other UEs

-UE schedules sidelink transmission of other UEs

The UE's resource selection method may include zone mapping, sensing-based resource selection, random selection, and configured grant-based resource selection.

A terminal supporting V2X sidelink communication may transmit and receive V2X packets based on a preset resource pool (Preconfiguration resource) included in SL-V2X-Preconfiguration, which is an information element (IE). For example, even if the terminal exists in the coverage of the base station, if the V2X sidelink communication cannot be performed based on the scheduled resource allocation and/or the UE autonomous resource selection mode for a predetermined reason, the terminal is preconfigurated to the IE, SL-V2X-Preconfiguration. V2X sidelink communication can be performed through a preconfigured sidelink transmission/reception resource pool. In addition, the vehicle terminal 1e-45 out of the coverage of the base station (out-of-coverage of E-UTRA/NR) is a side that is a transmission channel with another vehicle terminal 1e-65 or a pedestrian portable terminal 1e-55. V2X sidelink communication may be performed based on the above-described sidelink preconfiguration resource through links (SL, 1e-70, 1e-75).

LTE V2X SL communication was designed with the main goal of basic safety service. That is, a terminal supporting LTE V2X SL communication is designed to provide basic safety services to all neighboring terminals supporting LTE V2X SL communication through a broadcast transmission type. Accordingly, there is no need for the UE to perform a process of establishing a session separately from another specific UE or to perform a sidelink connection establishment procedure.

However, within the next-generation mobile communication (NR), V2X SL communication can be designed to provide not only basic safety services but also various and improved services (eg, autonomous driving service, platnooning service, remote driving service, in-vehicle infotainment). Therefore, in the case of NR V2X SL communication, it may be designed to support not only a broadcast transmission type but also a unicast and/or groupcast transmission type.

6 is a procedure in which the base station releases the connection of the terminal and the terminal switches from the RRC connected mode (RRC_CONNECTED) to the RRC idle mode (RRC_IDLE) according to various embodiments of the present disclosure, and the terminal establishes a connection with the base station. This is a diagram for explaining a procedure for switching from the RRC idle mode (RRC_IDLE) to the RRC connected mode (RRC_CONNECTED).

Referring to FIG. 6, the terminal 1f-01 may be in the RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station 1f-02. The base station sends an RRC connection release message (RRCRelease message) that does not contain reservation configuration information (suspendConfig or rrc-InactiveConfig) to the terminal when the terminal transmitting and receiving data in the RRC connected mode does not transmit or receive data for a predetermined reason or for a predetermined period of time. By transmitting (1f-05), the terminal can be made to transition to the RRC idle mode (RRC_IDLE).

The UE (1f-01) that has transitioned to the RRC idle mode may perform a cell selection procedure or a cell reselection procedure to find a suitable cell and camp-on (1f-10). The terminal may camp-on to an LTE cell or may camp-on to an NR cell. The terminal may receive system information broadcast from the cell in order to perform a cell selection procedure or a cell reselection procedure. For example, the system information may include at least one or more of MIB, SIB1, SIB2, SIB3, SIB4, SIB5, or SIB24.

Or, if the terminal in the RRC idle mode in step 1f-10 can perform V2X sidelink communication, the terminal receives system information including V2X sidelink communication configuration information (V2X sideilnk communication configuration) from the serving cell can do. For example, system information may include at least one or more of SIB21, SIB26, or SIBx to be newly defined in the case of LTE, and may include one or a plurality of new SIBx to be newly defined in the case of NR.

For example, the V2X sidelink communication configuration information includes a V2X sidelink communication reception resource pool (e.g., v2x-CommRxPool), a V2X sidelink communication transmission resource pool (e.g., v2x-CommTxPoolNormalCommon), to be used in exceptional circumstances. At least one or more of a V2X sidelink communication transmission resource pool (e.g., v2x-CommTxPoolExceptional) or an adjacent frequency resource information list (v2x-InterfreqInfoList) for performing V2X sidelink communication may be included. In addition, system information including the V2X sidelink communication configuration information may be broadcast for each radio access technology (Radio Access Technology, hereinafter RAT). For example, system information including LTE V2X sidelink configuration information and system information including NR V2X sidelink configuration information may be respectively broadcast. Alternatively, system information including V2X sidelink communication setting information for a plurality of wireless access technologies may be broadcast. For example, system information including both LTE V2X sidelink configuration information and NR V2X sidelink configuration information may be broadcast. For the ASN.1 structure for SIB21 or SIB26 described above, refer to "36.331: Radio Resource Control (RRC)" which is a 3GPP standard document. Table 1 is an example of the ASN.1 structure of the above-described new system information (SIBx).

[Table 1]

SIBy according to an embodiment of the present disclosure may refer to at least one of SIB21, SIB26, or SIBx to be newly defined. SIBx may mean one or more system information to be newly defined by including V2X sidelink configuration information.

In step 1f-15, if the UE in the RRC idle mode can perform V2X sidelink communication, it may be configured to perform V2X sidelink communication from an upper layer device (upper layers). In this case, it may be set to perform V2X sidelink communication in at least one of the following three cases.

● 제 1 경우: 상위 계층(upper layers)으로부터 특정 주파수에서 LTE V2X 사이드링크 통신을 수행하라고 설정되는 경우

● Case 1: When it is set to perform LTE V2X sidelink communication at a specific frequency from the upper layers

● 제 2 경우: 상위 계층(upper layers)으로부터 특정 주파수에서 NR V2X 사이드링크 통신을 수행하라고 설정되는 경우

● Second case: When it is set to perform NR V2X sidelink communication at a specific frequency from the upper layers

● 제 3 경우: 상위 계층(upper layers)으로부터 특정 주파수 또는 특정 주파수들에서 LTE V2X 사이드링크 통신과 NR V2X 사이드링크 통신을 동시에 수행하라고 설정되는 경우

● Case 3: When it is set to simultaneously perform LTE V2X sidelink communication and NR V2X sidelink communication at a specific frequency or specific frequencies from the upper layers

Or, in step 1f-15, meaning that the terminal in the RRC idle mode is set to perform the V2X sidelink communication, V2X sidelink communication that is not related to the communication between the vehicle terminal and the pedestrian portable terminal is transmitted (trasmit non-P2X related V2X sidelink communication and related data) or may mean to transmit V2X sidelink communication between the vehicle terminal and the pedestrian portable terminal (transmit P2X related V2X sidelink communication and related data).

The terminal in the RRC idle mode in step 1f-20 is the V2X side that is not related to communication between the vehicle terminal and the pedestrian portable terminal at a specific frequency(s) by at least one of the three cases described in step 1f-15. When it is set to transmit link communication, the specific frequency is included in the SIBy received in step 1f-20, but the V2X sidelink communication transmission resource pool for the specific frequency is not included (the concerned frequency is included in SIBx without Tx Pool), the terminal may perform an RRC connection establishment procedure with a base station. Specifically, the terminal may determine the case that the V2X sidelink communication transmission resource pool is not included as follows.

● 1f-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 주파수(Camped frequency)이고, 상기 단말이 캠프-온 한 셀에서 SIBy를 방송하고, 유효한 버전의 SIBy에서 sl-V2X-ConfigCommon을 포함하고 있으나, sl-V2X-ConfigCommon에 Tx Pool (일례로, v2x-CommTxPoolNormalCommon)이 포함되어 있지 않은 경우(if the frequency on which the UE is configured to transmit non-P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon does not include v2x-CommTxPoolNormalCommon)

● In step 1f-15, the frequency set to perform V2X sidelink communication from the upper layer device is the frequency at which the UE camped on (Camped frequency), and the UE broadcasts SIBy in one cell camped on, and a valid version SIBy includes sl-V2X-ConfigCommon, but sl-V2X-ConfigCommon does not contain Tx Pool (for example, v2x-CommTxPoolNormalCommon) (if the frequency on which the UE is configured to transmit non-P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon does not include v2x-CommTxPoolNormalCommon)

● 또는 1f-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 셀에서 방송하는 SIBy에 시그널링된 v2x-InterFreqInfoList에 포함되어 있고, 유효한 버전의 SIBy에서 Tx Pool (일례로, v2x-CommTxPoolNormal)이 포함되어 있지 않은 경우(if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include v2x-CommTxPoolNormal for the concerned frequency)

● Alternatively, the frequency set to perform V2X sidelink communication from the upper layer device in step 1f-15 is included in the v2x-InterFreqInfoList signaled to SIBy broadcasted in one cell camped by the UE, and Tx in the valid version of SIBy Pool (for example, v2x-CommTxPoolNormal) is not included (if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include v2x-CommTxPoolNormal for the concerned frequency)

Alternatively, the terminal in the RRC idle mode in step 1f-20 transmits V2X sidelink communication between the vehicle terminal and the pedestrian portable terminal at a specific frequency(s) by at least one of the three cases described in step 1f-15. When set to do, the specific frequency is included in the SIBy received in step 1f-20, but the V2X sidelink communication transmission resource pool for the specific frequency is not included (the concerned frequency is included in SIBy without Tx Pool) ), the terminal may perform an RRC connection establishment procedure with a base station. Specifically, the terminal may determine the case that the V2X sidelink communication transmission resource pool is not included as follows.

● 1f-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 주파수(Camped frequency)이고, 상기 단말이 캠프-온 한 셀에서 SIBy를 방송하고, 유효한 버전의 SIBy에서 sl-V2X-ConfigCommon을 포함하고 있으나, sl-V2X-ConfigCommon에 Tx Pool (일례로, p2x-CommTxPoolNormalCommon)이 포함되어 있지 않은 경우(if the frequency on which the UE is configured to transmit P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon does not include p2x-CommTxPoolNormalCommon)

● In step 1f-15, the frequency set to perform V2X sidelink communication from the upper layer device is the frequency at which the UE camped on (Camped frequency), and the UE broadcasts SIBy in one cell camped on, and a valid version SIBy includes sl-V2X-ConfigCommon, but sl-V2X-ConfigCommon does not contain Tx Pool (for example, p2x-CommTxPoolNormalCommon) (if the frequency on which the UE is configured to transmit P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon does not include p2x-CommTxPoolNormalCommon)

● 또는 1f-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 셀에서 방송하는 SIBy에 시그널링된 v2x-InterFreqInfoList에 포함되어 있고, 유효한 버전의 SIBy에서 Tx Pool (일례로, p2x-CommTxPoolNormal)이 포함되어 있지 않은 경우(if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include p2x-CommTxPoolNormal for the concerned frequency)

● Alternatively, the frequency set to perform V2X sidelink communication from the upper layer device in step 1f-15 is included in the v2x-InterFreqInfoList signaled to SIBy broadcasted in one cell camped by the UE, and Tx in the valid version of SIBy Pool (for example, p2x-CommTxPoolNormal) is not included (if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include p2x-CommTxPoolNormal for the concerned frequency)

In step 1f-25, the UE (1f-01) in the RRC idle mode includes the specific frequency(s) set to perform the V2X sidelink communication described above in step 1f-20 in SIBy, but the specific frequency(s) If the V2X sidelink communication transmission resource pool for) is not included, the base station (1f-02) and RRC connection establishment (RRC connection establishment) procedure can be performed. The UE may establish reverse transmission synchronization with the base station through a random access process and transmit an RRC connection request message (RRCSetupRequest message) to the base station (1f-25). The message may include a terminal identifier (ue-Identity) and a reason for establishing a connection (establishmentCause).

The base station may transmit an RRC connection setup message to the terminal so that the terminal establishes an RRC connection (1f-30). The message may include RRC connection configuration information. For example, the RRC connection configuration information may mean radio bearer configuration information (radioBearerConfig) and master cell group configuration information (masterCellGroup). Specifically, the radio bearer configuration information and the master cell group configuration information include SRB1 (Signaling Radio Bearer1) connection information, RLC bearer configuration information for SRB1, MAC cell group configuration information (mac-CellGroupConfig), and physical cell group configuration information. (physicalCellGroupConfig), etc. may be included. That is, RRC connection setup may involve SRB1 connection, and may not involve radio bearer connection other than SRB1 (for example, UE and base station transmit and receive SRB2 or data for transmitting and receiving NAS messages. For DRB (Data Radio Bearer) connection is not involved). After setting up the RRC connection, the terminal may transmit the RRC connection setup completion message (RRCSetupComplete message) to the base station after transitioning to the RRC connection mode (RRC_CONNECTED) (1f-31) (1f-35). The message may include a service request message (Service Request message) requesting the terminal to set up a bearer for a predetermined service to the AMF (1f-03). The base station transmits an initial terminal message in which the service request message contained in the RRC connection establishment completion message is received to the AMF (1f-40), and the AMF may determine whether to provide the service requested by the terminal. As a result of the determination, if the terminal can provide the requested service, the AMF may transmit an initial terminal context setup request message (Initial UE Context Setup Request message) to the base station (1f-45). The message may include QoS (Quality of Service) information to be applied when setting up the DRB, and supplementary information to be applied to the DRB (eg, Security Key, Security Algorithm).

When the RRC connection establishment procedure is successfully performed, the base station 1f-02 sends a security mode command message to activate AS security with the terminal 1f-01 in the RRC connection mode. It can be transmitted to the terminal (1f-50). When receiving the security mode command message, the terminal may transmit a security mode complete message to the base station (1f-55).

The base station 1f-02 performs an RRC connection reconfiguration (RRC reconfiguration) procedure with the terminal 1f-01 when transmitting the security command message or after the security mode command message is transmitted or after the security mode completion message is received. Can be done. First, the base station may transmit an RRC connection reconfiguration message to the terminal (1f-60). The message may include configuration information of DRB to which user data is to be processed or SRB2 to which NAS message is to be transmitted. Alternatively, the message may include V2X sidelink configuration information (eg, sl-V2X-ConfigDedicated). The terminal may apply the configuration information included in the RRC connection reconfiguration message and transmit an RRC connection reconfiguration complete message to the base station (1f-65). After completing the DRB setup with the UE, the base station transmits an initial UE Context Setup Response message to the AMF (1f-70), and the AMF receiving it transmits the UPF (1f-04) and the session management procedure. A PDU session can be established by performing (Session Management Procedure) (1f-76). As such, the general data transmission process can be largely composed of three steps: RRC connection setup, security setup, and DRB setup.

As described above, a lot of signaling procedures are required in order for the UE to set the RRC connection and switch from the RRC idle mode to the RRC connected mode. Therefore, in the next-generation mobile communication system, the RRC inactive mode (RRC_INACTIVE) can be newly defined, and in the new mode as described above, the UE and the base station store the context of the UE and, if necessary, maintain the S1 bearer. When the inactive mode terminal attempts to reconnect to the network, the RRC connection resumption procedure proposed below can access faster and transmit and receive data with a smaller signaling procedure.

7 is a procedure in which the base station releases the connection of the terminal and the terminal switches from the RRC connected mode (RRC_CONNECTED) to the RRC inactive mode (RRC_INACTIVE) according to various embodiments of the present disclosure, and the terminal resumes connection with the base station. This is a diagram for explaining a procedure of switching from the RRC inactive mode (RRC_INACTIVE) to the RRC connected mode (RRC_CONNECTED).

Referring to FIG. 7, the terminal 1g-01 may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station 1g-02. The base station transmits an RRC connection release message (RRCRelease message) including reservation configuration information (suspendConfig or rrc-InactiveConfig) to the terminal when the terminal transmitting and receiving data in the RRC connected mode does not transmit or receive data for a predetermined reason or for a predetermined time. Thus (1g-05), the terminal can be made to transition to the RRC inactive mode (RRC_INACTIVE).

In the above, when the terminal receives the RRC connection release message including reservation configuration information from the base station, a series of operations of the proposed terminal are as follows.

● 단말은 수신한 유보 설정 정보를 적용할 수 있다(apply the received suspendConfig).

● The terminal may apply the received reservation configuration information (apply the received suspendConfig).

■ 완전한 단말 연결 재개 식별자(fullI-RNTI): 상기 단말은 셀 선택/재선택 과정을 통해, 추후 연결을 재개하고자 하는 셀에서 방송하는 SIB1에 useFullResumeID가 시그널링 되면, 해당 셀로 RRCResumeRequest1 메시지를 전송할 수 있다. 즉, 단말은 resumeIdentity를 I-RNTI value로 설정하여 상기 셀로 RRCResumeRequest1 메시지를 전송할 수 있다. The reservation setting information may include at least one of the following parameters.

■ Complete UE Connection Resume Identifier (fullI-RNTI): When useFullResumeID is signaled to SIB1 broadcast by a cell to resume connection later through a cell selection/reselection process, the UE may transmit an RRCResumeRequest1 message to the cell. That is, the UE may transmit the RRCResumeRequest1 message to the cell by setting resumeIdentity to the I-RNTI value.

■ 짧은 단말 연결 재개 식별자(ShortI-RNTI): 상기 단말은 셀 선택/재선택 과정을 통해, 추후 연결을 재개하고자 하는 셀에서 방송하는 SIB1에 useFullResumeID가 시그널링 되지 않을 경우, 해당 셀로 RRCResumeRequest 메시지를 전송할 수 있다. 즉, 단말은 resumeIdentity를 ShortI-RNTI value로 설정하여 상기 셀로 RRCResumeRequest 메시지를 전송할 수 있다.

■ Short terminal connection resumption identifier (ShortI-RNTI): The terminal can transmit an RRCResumeRequest message to the cell through a cell selection/reselection process, when useFullResumeID is not signaled to SIB1 broadcast from a cell to resume connection at a later time. have. That is, the UE may transmit an RRCResumeRequest message to the cell by setting resumeIdentity to a ShortI-RNTI value.

■ 랜 페이징 사이클(ran-PagingCyle): RRC 비활성화 모드에 있는 단말은 ran-PagingCycle 필드에 포함되어 있는 PagingCylce을 적용하여 RAN-initiated paging을 모니터링 할 수 있다. RAN-initiated paging 수신 시, 상기 단말은 기지국과 RRC 연결 재개 절차를 수행할 수 있다.

■ LAN-Paging Cycle (ran-PagingCyle): A terminal in the RRC deactivation mode can monitor RAN-initiated paging by applying PagingCylce included in the ran-PagingCycle field. Upon receiving RAN-initiated paging, the terminal may perform an RRC connection resumption procedure with the base station.

■ 랜 기반 알림 영역 정보(ran-NotificationAreaInfo): RRC 비활성화 모드에 있는 단말은 SIB1 수신 후 랜 기반 알림 영역(RAN-based Notification Area, RNA)에 벗어난 경우, 해당 셀 또는 기지국과 랜 기반 알림 영역 업데이트(RNA update, RNAU) 절차를 수행할 수 있다.

■ LAN-based notification area information (ran-NotificationAreaInfo): When the terminal in the RRC inactive mode is out of the LAN-based notification area (RNA) after receiving SIB1, the corresponding cell or base station and the LAN-based notification area are updated ( RNA update, RNAU) procedure can be performed.

■ t380: RRC 비활성화 모드에 있는 단말이 주기적으로 RNAU 절차를 수행하기 위한 PeridocRNAU-TimerValue가 포함되어 있을 수 있다. 상기 값이 포함되어 있는 경우, 상기 단말은 상기 값으로 설정하여 T380 타이머를 구동할 수 있다. 그리고, 상기 단말은 상기 타이머 만료 시, 기지국과 RNAU 절차를 수행할 수 있다.

■ t380: PeridocRNAU-TimerValue for a terminal in RRC inactivation mode to periodically perform an RNAU procedure may be included. If the value is included, the terminal may drive the T380 timer by setting it to the value. And, when the timer expires, the terminal may perform an RNAU procedure with a base station.

■ nextHopChaingCount: RRC 비활성화 모드에 있는 단말이 NextHopChainingCount를 이용하여 보안 키(KgNB key)와 이와 관련된 파라미터들을 업데이트할 수 있다.

■ nextHopChaingCount: A terminal in RRC deactivation mode can update a security key (KgNB key) and related parameters using NextHopChainingCount.

● 단말은 MAC 계층 장치를 리셋(reset)할 수 있다. 이는 HARQ 버퍼에 저장되어 있는 데이터들이 다시 연결을 재개했을 때 불필요한 재전송을 수행하지 않도록 하기 위해서이다.

● The terminal can reset the MAC layer device. This is to prevent unnecessary retransmission when data stored in the HARQ buffer resumes connection.

● 단말은 SRB1에 대해서 RLC 계층 장치들을 재수립(re-establish)할 수 있다. 이는 RLC 버퍼에 저장되어 있는 데이터들이 다시 연결을 재개했을 때 불필요한 재전송을 수행하지 않도록 하기 위해서, 그리고 추후 사용을 위한 변수들을 초기화하기 위해서이다.

● The UE may re-establish RLC layer devices for SRB1. This is to prevent unnecessary retransmission when data stored in the RLC buffer is reconnected again, and to initialize variables for later use.

● 단말은 단말 비활성화 AS 컨텍스트(UE Inactive AS Context)를 저장할 수 있다. 상기 UE Inactive AS Context는 설정된 유보 설정 정보, 현재 보완 키(KgNB 키 및/또는 KRRCint 키), ROHC 상태, 소스 셀(source PCell)에서 사용하였던 단말 셀 식별자(C-RNTI), 소스 셀의 셀 식별자(cellIdentity)와 물리적 셀 식별자(physical cell identity), ReconfigurationWithSync를 제외한 설정된 다른 파라미터들(all other parameters configured except ReconfigurationWithSync)을 의미할 수 있다.

● The terminal may store the UE Inactive AS Context. The UE Inactive AS Context is configured reservation configuration information, a current supplement key (KgNB key and/or KRRCint key), ROHC state, a terminal cell identifier (C-RNTI) used in a source cell (source PCell), and a cell identifier of the source cell. It may mean (cellIdentity), physical cell identity (physical cell identity), and other parameters configured except ReconfigurationWithSync (all other parameters configured except ReconfigurationWithSync).

● 단말은 SRB0를 제외한 모든 SRB들과 DRB들을 중지(suspend)할 수 있다.

● The UE can suspend all SRBs and DRBs except SRB0.

● 단말은 모든 DRB들에 대해 하위 계층 장치들에게 PDCP 중지를 지시(indicate)할 수 있다.

● The UE may indicate to lower layer devices to stop PDCP for all DRBs.

● 만약 수신한 유보 설정 정보에 t380 이 포함되어 있다면, t380 으로 타이머 값을 설정하여 T380 타이머를 구동할 수 있다.

● If t380 is included in the received reservation setting information, the timer T380 can be driven by setting the timer value to t380.

● 만약 RRC 연결 해제 메시지에 waitTime이 포함되어 있다면, waitTime 으로 타이머 값을 설정하여 T320 타이머를 구동할 수 있다. 그리고 접속 범주(access category)인 '0'과 '2'를 제외하고, 모든 접속 범주들에 대해 접속 금지(access barring)가 적용된다고(applicable) 상위 계층 장치에게 알려줄 수 있다.

● If waitTime is included in the RRC connection release message, the T320 timer can be driven by setting the timer value as waitTime. In addition, it is possible to inform the upper layer device that access barring is applicable to all access categories except for '0' and '2', which are access categories.

● 단말은 RRC 비활성화 모드(RRC_INACTIVE)로 천이(1g-06)하고 셀 선택 절차를 수행할 수 있다.

● The UE may transition to the RRC inactive mode (RRC_INACTIVE) (1g-06) and perform a cell selection procedure.

The terminal 1g-01, which has transitioned to the RRC deactivation mode, may perform a cell selection procedure or a cell reselection procedure to find a suitable cell and camp-on (1g-10). The terminal may maintain the RRC deactivation mode when establishing an RRC connection with the NR base station before transitioning to the RRC deactivation mode, camping on the NR cell, and the like. However, when the terminal camps on the LTE cell, it may transition to the RRC idle mode. On the other hand, when the terminal establishes an RRC connection with an LTE base station before transitioning to the RRC deactivation mode, when camping on an LTE cell, the RRC deactivation mode can be maintained. However, when the terminal camps on the NR cell, it may transition to the RRC idle mode. In order to perform a cell selection procedure or a cell reselection procedure, the terminal may receive system information broadcast from the cell. For example, the system information is MIB, SIB1, SIB2, SIB3, SIB4, SIB5, or SIB24. It may include at least one of information.

Alternatively, if the terminal in the RRC deactivation mode in step 1g-10 can perform V2X sidelink communication, the terminal receives system information including V2X sidelink communication configuration information from the serving cell. I can.

For example, system information may include at least one or more of SIB21, SIB26, or SIBx to be newly defined in the case of LTE, and may include one or a plurality of new SIBx to be newly defined in the case of NR.

For example, the V2X sidelink communication configuration information includes a V2X sidelink communication reception resource pool (e.g., v2x-CommRxPool), a V2X sidelink communication transmission resource pool (e.g., v2x-CommTxPoolNormalCommon), to be used in exceptional circumstances. At least one or more of a V2X sidelink communication transmission resource pool (e.g., v2x-CommTxPoolExceptional) or an adjacent frequency resource information list (v2x-InterfreqInfoList) for performing V2X sidelink communication may be included. In addition, system information including the V2X sidelink communication configuration information may be broadcast for each radio access technology (Radio Access Technology, hereinafter RAT). For example, system information including LTE V2X sidelink configuration information and system information including NR V2X sidelink configuration information may be respectively broadcast. Alternatively, system information including V2X sidelink communication setting information for a plurality of wireless access technologies may be broadcast. For example, system information including both LTE V2X sidelink configuration information and NR V2X sidelink configuration information may be broadcast. For the ASN.1 structure for SIB21 or SIB26 described above, refer to "36.331: Radio Resource Control (RRC)" which is a 3GPP standard document. Table 2 is an example of the ASN.1 structure of the above-described new system information (SIBx).

[Table 2]

SIBy according to an embodiment of the present disclosure may refer to at least one of SIB21, SIB26, or SIBx to be newly defined. SIBx may mean one or more system information to be newly defined by including V2X sidelink configuration information.

In step 1g-15, when the UE in the RRC deactivation mode can perform V2X sidelink communication, it may be configured to perform V2X sidelink communication from an upper layer device (upper layers). In this case, it may be set to perform V2X sidelink communication in at least one of the following three cases.

● 제 1 경우: 상위 계층(upper layers)으로부터 특정 주파수에서 LTE V2X 사이드링크 통신을 수행하라고 설정되는 경우

● Case 1: When it is set to perform LTE V2X sidelink communication at a specific frequency from the upper layers

● 제 2 경우: 상위 계층(upper layers)으로부터 특정 주파수에서 NR V2X 사이드링크 통신을 수행하라고 설정되는 경우

● Second case: When it is set to perform NR V2X sidelink communication at a specific frequency from the upper layers

● 제 3 경우: 상위 계층(upper layers)으로부터 특정 주파수 또는 특정 주파수들에서 LTE V2X 사이드링크 통신과 NR V2X 사이드링크 통신을 동시에 수행하라고 설정되는 경우

● Case 3: When it is set to simultaneously perform LTE V2X sidelink communication and NR V2X sidelink communication at a specific frequency or specific frequencies from the upper layers

Or, in step 1g-15, the meaning that the terminal in the RRC deactivation mode is set to perform the V2X sidelink communication means that V2X sidelink communication that is not related to the communication between the vehicle terminal and the pedestrian portable terminal is transmitted (trasmit non-P2X related V2X sidelink communication and related data) or may mean to transmit V2X sidelink communication between the vehicle terminal and the pedestrian portable terminal (transmit P2X related V2X sidelink communication and related data).

The terminal in the RRC deactivation mode in step 1g-20 is the V2X side that is not related to communication between the vehicle terminal and the pedestrian portable terminal at a specific frequency(s) by at least one of the three cases described in step 1g-15. When it is set to transmit link communication, the specific frequency is included in the SIBy received in step 1g-20, but the V2X sidelink communication transmission resource pool for the specific frequency is not included (the concerned frequency is included in SIBx without Tx Pool), the terminal may perform an RRC connection resume procedure with the base station. Specifically, the terminal may determine the case that the V2X sidelink communication transmission resource pool is not included as follows.

● 1g-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 주파수(Camped frequency)이고, 상기 단말이 캠프-온 한 셀에서 SIBy를 방송하고, 유효한 버전의 SIBy에서 sl-V2X-ConfigCommon을 포함하고 있으나, sl-V2X-ConfigCommon에 Tx Pool (일례로, v2x-CommTxPoolNormalCommon)이 포함되어 있지 않은 경우(if the frequency on which the UE is configured to transmit non-P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon do(es) not include v2x-CommTxPoolNormalCommon)

● In step 1g-15, the frequency set to perform V2X sidelink communication from the upper layer device is the frequency at which the UE camped on (Camped frequency), and the UE broadcasts SIBy in one cell camped on, and a valid version SIBy includes sl-V2X-ConfigCommon, but sl-V2X-ConfigCommon does not contain Tx Pool (for example, v2x-CommTxPoolNormalCommon) (if the frequency on which the UE is configured to transmit non-P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon do (es) not include v2x-CommTxPoolNormalCommon)

● 또는 1g-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 셀에서 방송하는 SIBy에 시그널링된 v2x-InterFreqInfoList에 포함되어 있고, 유효한 버전의 SIBy에서 Tx Pool (일례로, v2x-CommTxPoolNormal)이 포함되어 있지 않은 경우(if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include v2x-CommTxPoolNormal for the concerned frequency)

● Alternatively, the frequency set to perform V2X sidelink communication from the upper layer device in step 1g-15 is included in the v2x-InterFreqInfoList signaled to SIBy broadcast in one cell camped by the UE, and Tx in the valid version of SIBy Pool (for example, v2x-CommTxPoolNormal) is not included (if the frequency(ies) on which the UE is configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include v2x-CommTxPoolNormal for the concerned frequency)

Alternatively, the terminal in the RRC deactivation mode in step 1g-20 transmits V2X sidelink communication between the vehicle terminal and the pedestrian portable terminal at a specific frequency(s) in at least one of the three cases described in step 1g-15. When set to do, the specific frequency(s) are included in the SIBy received in step 1g-20, but the V2X sidelink communication transmission resource pool for the specific frequency is not included (the concerned frequency is included in SIBx) without Tx Pool), the terminal may perform an RRC connection resume procedure with the base station. Specifically, the terminal may determine the case that the V2X sidelink communication transmission resource pool is not included as follows.

● 1g-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 주파수(Camped frequency)이고, 상기 단말이 캠프-온 한 셀에서 SIBx를 방송하고, 유효한 버전의 SIBy에서 sl-V2X-ConfigCommon을 포함하고 있으나, sl-V2X-ConfigCommon에 Tx Pool (일례로, p2x-CommTxPoolNormalCommon)이 포함되어 있지 않은 경우(if the frequency on which the UE is configured to transmit P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon do(es) not include p2x-CommTxPoolNormalCommon)

● In step 1g-15, the frequency set to perform V2X sidelink communication from the upper layer device is the frequency at which the UE camped on (Camped frequency), and the UE broadcasts SIBx in one cell camped on, and a valid version SIBy includes sl-V2X-ConfigCommon, but sl-V2X-ConfigCommon does not contain Tx Pool (for example, p2x-CommTxPoolNormalCommon) (if the frequency on which the UE is configured to transmit P2X related V2X sidelink communication concerns the camped frequency; and if SystemInformationBlockTypey is(are) broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey include(s) sl-V2X-ConfigCommon; and sl-V2X-ConfigCommon do(es ) not include p2x-CommTxPoolNormalCommon)

● 또는 1g-15 단계에서 상위 계층 장치로부터 V2X 사이드링크 통신을 수행하라고 설정된 주파수가 상기 단말이 캠프-온 한 셀에서 방송하는 SIBy에 시그널링된 v2x-InterFreqInfoList에 포함되어 있고, 유효한 버전의 SIBy에서 Tx Pool (일례로, p2x-CommTxPoolNormal)이 포함되어 있지 않은 경우(if the frequency(ies) on which the UE is(are) configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include p2x-CommTxPoolNormal for the concerned frequency)

● Alternatively, the frequency set to perform V2X sidelink communication from the upper layer device in step 1g-15 is included in the v2x-InterFreqInfoList signaled to SIBy broadcast in one cell camped by the UE, and Tx in the valid version of SIBy Pool (for example, p2x-CommTxPoolNormal) is not included (if the frequency(ies) on which the UE is(are) configured to transmit non-P2X related V2X sidelink communication is(are) included in v2x-InterFreqInfoList within SystemInformationBlockTypey broadcast by the cell on which the UE camps; and if the valid version of SystemInformationBlockTypey do(es) not include p2x-CommTxPoolNormal for the concerned frequency)

When the UE in the RRC deactivation mode in step 1g-25 determines that the V2X sidelink communication transmission resource pool is not included in step 1g-20, the base station 1g-02 to resume the RRC connection and the RRC connection resumption procedure ( RRC connection resume procedure) can be performed. A terminal according to various embodiments of the present disclosure may perform an RRC connection resumption procedure capable of transitioning to an RRC connection mode. When the terminal performs a random access procedure with the base station and transmits an RRC message to the base station, the proposed terminal operation is as follows (1g-25).

One. When the useFullResumeID field is signaled in the system information (SIB1), the terminal may select a message to be transmitted to the base station as RRCResumeRequest1. The UE may prepare to transmit by including the resumeIdentity as a stored fullI-RNTI value in the RRCResumeRequest1 message. Otherwise, the terminal may select a message to be transmitted to the base station as an RRCResumeRequest. The terminal may prepare to transmit by including the shortResumeIdentity in the RRCResumeRequest message as a stored segmented terminal connection resume identifier value (shortI-RNTI value).

2. The terminal may select one of the following values listed in Table 3 for the reason for resuming connection (resumeCause). In this case, it is suggested to set it to a value other than'rna-Update'. For example, you can set resumeCause to'mo-Signalling'. In the case of setting to'rna-Update', this is because the UE cannot request a Tx Pool from the base station or cannot receive a Tx Pool because the UE cannot transition to the RRC connection mode. For example, when resueCause is set to'rna-Update', the terminal may maintain the RRC deactivation mode by receiving an RRC connection release message including reservation setting information from the base station.

[Table 3]

3. RRC configuration information and security context information can be recovered from the UE Inactive AS Context stored except for the cell group configuration information (cellGroupConfig).

4. The UE can prepare for transmission by calculating MAC-I and including the last 16 bits in the resumeMAC-I field of the selected message.

5. The UE updates the new KgNB security key based on the current KgNB security key and NH (NextHop) value and the stored NCC value.

6. Then, the UE derives new security keys (K_RRCenc, K_RRC_int, K_UPint, K_UPenc) to be used in the integrity protection and verification procedure and the encryption and decryption procedure using the newly updated KgNB security key.

7. And the UE resumes the integrity protection and verification procedure by applying the updated security keys and previously set algorithm to all bearers except SRB0, and applies integrity verification and protection to data transmitted and received thereafter. do. This is to increase reliability and security of data transmitted and received from SRB1 or DRBs later.

8. Then, the UE resumes the encryption and decryption procedure by applying the updated security keys and previously set algorithm to all bearers except SRB0, and applies encryption and decryption to data transmitted and received thereafter. This is to increase reliability and security of data transmitted and received from SRB1 or DRBs later.

9. The UE may recover the PDCP state and re-establish PDCP entities for SRB1.

10. The UE resumes SRB1. This is because the RRCResume message will be received by SRB1 in response to the RRCResumeRequset message or RRCResumeRequest1 message to be transmitted.

11. The terminal constructs the message selected above, that is, an RRCResumeRequset message or an RRCResumeRequest1 message for transmission to the base station and transmits it to the lower layer devices.

12. The terminal drives the timer T319 when transmitting the RRCResumeRequest message or the RRCResumeRequest1 message to the base station.

When the UE in the RRC deactivation mode receives an RRC connection resume message (RRCResume message) in step 1g-30, the proposed UE operation is as follows.

- 단말은 RRCResumeRequest 메시지 또는 RRCResumeRequest1 메시지를 기지국으로 전송 시 구동한 타이머 T319를 멈춘다.

-The terminal stops the timer T319 driven when transmitting the RRCResumeRequest message or the RRCResumeRequest1 message to the base station.

- 만약 RRCResume 메시지에 완전한 설정 정보(fullConfig)를 포함하고 있다면, 단말은 완전한 설정 절차(full configuration procedure)를 수행한다. 그렇지 않을 경우, 단말은 상기 메시지를 수신하면 PDCP 상태를 복원하고, SRB2와 모든 DRB들을 위해 COUNT 값을 리셋한다. 그리고 단말은 저장해두었던 단말 컨텍스트로부터 셀그룹 설정 정보(cellGroupConfig)를 복원한다. 그리고 단말은 하위 계층 장치들에게 이를 지시한다.

-If the RRCResume message includes complete configuration information (fullConfig), the terminal performs a full configuration procedure (full configuration procedure). Otherwise, upon receiving the message, the UE restores the PDCP state and resets the COUNT value for SRB2 and all DRBs. In addition, the terminal restores the cell group configuration information (cellGroupConfig) from the stored terminal context. And the terminal instructs the lower layer devices to this.

- 단말은 완전한 단말 연결 재개 식별자(FullI-RNTI), 분할된 단말 연결 재개 식별자(ShortI-RNTI), 저장해두었던 단말 컨텍스트를 해제한다. 이 때 랜 지시 영역 정보(ran-NotificatioAreaInfo)는 해제하지 않는다.

-The terminal releases the complete terminal connection resumption identifier (FullI-RNTI), the divided terminal connection resumption identifier (ShortI-RNTI), and the stored terminal context. At this time, the LAN indication area information (ran-NotificatioAreaInfo) is not released.

- 만약 RRCResume 메시지에서 마스터 셀그룹(masterCellgroup) 설정 정보를 포함하고 있다면, 설정 정보에 따라서 셀 그룹 설정 절차를 수행할 수 있다.

-If the RRCResume message includes master cell group configuration information, a cell group configuration procedure may be performed according to the configuration information.

- 만약 상기 메시지에서 베어러 설정 정보(radioBearerConfig)를 포함하고 있다면, 설정 정보에 따라서 베어러를 설정할 수 있다.

-If the message includes bearer configuration information (radioBearerConfig), the bearer can be configured according to the configuration information.

- 단말은 SRB2와 모든 DRB들을 재개(resume)한다.

-The UE resumes SRB2 and all DRBs.

- 단말은 저장해두었던 셀 재선택 우선순위 정보가 있으면 폐기한다. 상기 정보는 RRCRelease 메시지에 수납될 수 있는 CellReselectionPriorities로부터 저장되었거나 다른 RAT으로부터 이어받은 셀 재선택 우선 순위 정보일 수 있다.

-The terminal discards any stored cell reselection priority information. The information may be cell reselection priority information stored from CellReselectionPriorities that may be contained in the RRCRelease message or inherited from another RAT.

- 단말은 타이머 T320이 구동되고 있으면 멈출 수 있다.

-The terminal can be stopped when the timer T320 is running.

- 만약 RRCResume 메시지에서 주파수 측정 설정 정보(measConfig)를 포함하고 있다면, 설정 정보에 따라서 주파수 측정을 수행할 수 있다.

-If the RRCResume message includes the frequency measurement configuration information (measConfig), frequency measurement can be performed according to the configuration information.

- 만약 RRC 연결이 중단(suspend)되었을 경우, 주파수 측정을 재개할 수 있다.

-If the RRC connection is suspended, frequency measurement can be resumed.

- 만약 RRCResume 메시지에 V2X 사이드링크 설정 정보(예를 들어, sl-V2X-ConfigDedicated)를 포함하고 있다면, 상기 설정 정보를 적용할 수 있다.

-If the RRCResume message includes V2X sidelink configuration information (eg, sl-V2X-ConfigDedicated), the configuration information can be applied.

- 단말은 RRC 연결 모드로 천이한다(1g-31).

-The terminal transitions to the RRC connected mode (1g-31).

- 단말은 상위 계층 장치들에게 중지되었던 RRC 연결이 재개되었다고 지시한다.

-The terminal instructs the upper layer devices that the RRC connection that was stopped has been resumed.

- 단말은 셀 재선택 절차를 멈출 수 있다.

-The terminal may stop the cell reselection procedure.

- 단말은 현재 접속한 셀을 프라이머리 셀(Primary Cell, PCell)으로 간주한다.

-The UE considers the currently accessed cell as a Primary Cell (PCell).

- 그리고 하위 계층 장치들로 전송을 위해서 RRC 연결 재개 완료 메시지(RRCResumeComplete 메시지)를 다음과 같이 구성하고 전달한다(1g-35).

And, for transmission to lower layer devices, an RRC connection resumption completion message (RRCResumeComplete message) is configured and delivered as follows (1g-35).

A. 만약 상위 계층 장치들에서 NAS PDU를 제공하였다면, dedicatedNAS-Message에 이를 포함할 수 있다.

A. If higher layer devices provide NAS PDUs, they may be included in the dedicatedNAS-Message.

B. 만약 상위 계층 장치들에서 혹은 NAS 계층에서 PLMN을 제공하였다면, SIB1에 포함된 plmn-IdentityList로부터 상위 계층 장치들에서 혹은 NAS 계층에서 선택한 PLMN을 selectedPLMN-Identity로 설정할 수 있다.

B. If the PLMN is provided by the upper layer devices or the NAS layer, the PLMN selected by the upper layer devices or the NAS layer from the plmn-IdentityList included in SIB1 can be set as selectedPLMN-Identity.

FIG. 8 is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station by a terminal transitioning from an RRC idle mode to an RRC connected mode, according to various embodiments of the present disclosure.

The UE in the RRC connected mode can transmit a SidelinkUEInformation message to the base station when it wants to receive V2X sidelink communication or when it wants to no longer receive V2X sidelink communication (The purpose of transmitting SidelinkUEInformation is to inform E-UTRAN or NR that the UE in RRC_CONNECTED is interested or no longer interested to receive V2X sidelink communication).

Referring to FIG. 8, a terminal supporting vehicle communication in step 1h-01 may be in an RRC idle mode (RRC_IDLE).

In steps 1h-05, a terminal supporting vehicle communication may be in an RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with a base station.

In step 1h-10, the terminal checks whether the system information is valid if sl-V2X-ConfigCommon is included in the system information broadcast from the PCell (for example, SIBy including the V2X sidelink communication configuration information). I can. Alternatively, in step 1h-10, the terminal may check whether the system information broadcast by the PCell (for example, one or more SIBy including V2X sidelink communication configuration information) is valid.

In step 1h-15, the terminal may determine whether a primary frequency or one or more frequencies set to receive V2X sidelink communication from an upper layer is included in the v2x-InterFreqInfoList included in the system information. If included, the terminal may determine whether at least one of the following conditions is satisfied in step 1h-20.

- 가장 최근에 RRC 연결 모드로 천이한 후, 기지국에게 SidelinkUEInformation 메시지를 전송하지 않은 경우(if the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state)

-If the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state after the most recent transition to the RRC connection mode, the base station has not transmitted a SidelinkUEInformation message

- SidelinkUEInformation 메시지를 마지막에 전송한 이후, 상기 단말이 연결한 PCell에서 sl-V2X-ConfigCommon을 포함하는 시스템 정보를 방송하지 않을 경우(if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

-After the last transmission of the SidelinkUEInformation message, if the PCell connected by the UE does not broadcast system information including sl-V2X-ConfigCommon (if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

- 마지막에 전송한 SidelinkUEInformation 메시지에 V2X 사이드링크 통신을 수신하고자 하는 주파수 리스트(일례로, v2x-CommRxInterestedFreqList)를 포함하지 않은 경우 또는 마지막에 SidelinkUEInformation 메시지를 전송한 후에 상위 계층 장치로부터 V2X 사이드링크 통신을 수신하라고 설정된 하나 또는 복수 개의 주파수가 변경되었을 경우(if the last transmission of the SidelinkUEInformation message did not include v2x-CommRxInterestedFreqList; or if the frequency(ies) configured by upper layers to receive V2X sidelink communication on has changed since the last transmission of the SidelinkUEInformation message)

-When the lastly transmitted SidelinkUEInformation message does not include a frequency list to receive V2X sidelink communication (for example, v2x-CommRxInterestedFreqList), or receives a V2X sidelink communication from a higher layer device after transmitting a SidelinkUEInformation message at the end If the last transmission of the SidelinkUEInformation message did not include v2x-CommRxInterestedFreqList; or if the frequency(ies) configured by upper layers to receive V2X sidelink communication on has changed since the last transmission of the SidelinkUEInformation message)

In step 1h-25, if any of the above-described conditions in step 1h-20 is satisfied, the UE sends an indicator for one frequency of interest or indicators for a plurality of frequencies to the v2x-CommRxInterestedFreqList for V2X sidelink communication reception. Including the SidelinkUEInformation message can be transmitted to the base station. Specifically, v2x-CommRxInterestedFreqList may be configured in the following form.

- 0의 값은 PCell의 주파수를 의미할 수 있다(The value 0 corresponds the PCell's frequency)

-A value of 0 may mean the frequency of the PCell (The value 0 corresponds to the PCell's frequency)

- 1의 값은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 첫번째 엔트리에 있는 주파수를 의미할 수 있다(The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). 동일한 원리로, k의 값(k>1)은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 k번재 엔트리에 있는 주파수를 의미할 수 있다(The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

-A value of 1 may mean a frequency in the first entry in v2x-InterFreqInfoList included in SIBx (The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). According to the same principle, the value k (k>1) may mean a frequency in the kth entry in the v2x-InterFreqInfoList included in the SIBx (The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

The terminal according to an embodiment of the present disclosure transmits a SidelinkUEInformation message including an indicator or information element (IE) indicating which radio access technology (RAT) the one or more frequencies are applied to. It is proposed to transmit to the base station.

- v2x-CommRxInterestedFreqList에 포함되어 있는 0의 값이 LTE V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 수신하기 위한 주파수이면서 NR V2X 사이드링크 통신을 수신할 수 있는 주파수인 지를 나타내는 지시자를 포함할 수 있다. 일례로, 2 상기 주파수가 LTE를 위한 것인 지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 건지 구별할 수 있는 2 bit를 도입할 수 있다.

-Whether the value of 0 included in v2x-CommRxInterestedFreqList is a frequency for receiving LTE V2X sidelink communication or a frequency for receiving NR V2X sidelink communication or a frequency for receiving LTE V2X sidelink communication while NR It may include an indicator indicating whether it is a frequency capable of receiving the V2X sidelink communication. As an example, 2 may introduce 2 bits capable of distinguishing whether the frequency is for LTE or for NR, or for both LTE and NR.

- 만약 LTE V2X 사이드링크 통신 설정 정보가 담긴 시스템 정보와 NR V2X 사이드링크 통신 설정 정보가 담긴 시스템 정보가 구별되어 기지국으로부터 방송될 경우, 상기 단말은 v2x-CommRxInterestedFreqList에 포함되어 있는 k(k>=1)의 값이 LTE V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 수신하기 위한 주파수이면서 NR V2X 사이드링크 통신을 수신할 수 있는 주파수인 지를 나타내는 지시자를 포함할 수 있다. 일례로, k의 값이 나타내는 주파수가 LTE를 위한 것인지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 것인지 구별할 수 있는 2 bit를 도입할 수 있다.

-If system information containing LTE V2X sidelink communication configuration information and system information containing NR V2X sidelink communication configuration information are distinguished and broadcast from the base station, the terminal k (k>=1 included in v2x-CommRxInterestedFreqList) ) Is a frequency for receiving LTE V2X sidelink communication or a frequency for receiving NR V2X sidelink communication, or is a frequency for receiving LTE V2X sidelink communication while receiving NR V2X sidelink communication. It may include an indicator indicating whether the frequency is present. As an example, 2 bits can be introduced to distinguish whether the frequency indicated by the value of k is for LTE or NR, or for both LTE and NR.

If the above-described conditional expression is not satisfied in step 1h-15, the terminal may determine whether v2x-CommRxInterestedFreqList is included in the last or most recently sent SidelinkUEInformation message in step 1h-30. If included, in steps 1h-35, the terminal may transmit a SidelinkUEInformation message to the base station without including an indicator for one frequency or indicators for a plurality of frequencies that are no longer interested in receiving V2X sidelink communication in the v2x-CommRxInterestedFreqList. have. For example, a frequency that is no longer of interest may mean a frequency that is no longer set to receive V2X sidelink communication from an upper layer device. In this case, a SidelinkUEInformation message may be transmitted to the base station by including an indicator or information element indicating which radio access technology the one or more frequencies are for according to the above description.

In step 1h-40, the terminal may receive an RRC connection reconfiguration message from the base station. The message may include V2X sidelink configuration information. As an example, the information element SL-V2X-ConfigDedicated may be included. Through this, the terminal can be provided with resource allocation mode determination and resource information, and thus can perform V2X sidelink communication with other vehicle terminals.

9 is a diagram illustrating a terminal operation for a terminal transitioning from an RRC idle mode to an RRC connected mode to transmit a SidelinkUEInformation message to a base station according to various embodiments of the present disclosure.

The UE in the RRC connected mode may transmit a SidelinkUEInformation message to the base station when requesting transmission resources from the base station for V2X sidelink communication or releasing transmission resources (The purpose of transmitting SidelinkUEInformation is to inform E-UTRAN or NR that the UE in RRC_CONNECTED is to request assignment or release of transmission resources for V2X sidelink communication).

Referring to FIG. 9, a terminal supporting vehicle communication in step 1i-01 may be in an RRC idle mode (RRC_IDLE).

In steps 1i-05, the terminal supporting vehicle communication may be in the RRC connection mode (RRC_CONNECTED) by establishing an RRC connection with the base station.

In step 1i-10, the terminal checks whether the system information is valid if sl-V2X-ConfigCommon is included in the system information broadcast from the PCell (e.g., SIBx that includes V2X sidelink communication configuration information). I can. Alternatively, in step 1i-10, the terminal may check whether the system information broadcast by the PCell (for example, one or more SIBx including V2X sidelink communication configuration information) is valid.

In step 1i-15, the terminal may determine whether a primary frequency or one or more frequencies set to transmit V2X sidelink communication from an upper layer are included in the v2x-InterFreqInfoList included in the system information. If included, the terminal may determine whether at least one of the following conditions is satisfied in step 1i-20.

- 가장 최근에 RRC 연결 모드로 천이한 후, 기지국에게 SidelinkUEInformation 메시지를 전송하지 않은 경우(if the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state)

-If the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state after the most recent transition to the RRC connection mode, the base station has not transmitted a SidelinkUEInformation message

- SidelinkUEInformation 메시지를 마지막으로 전송한 후에, 상기 단말이 연결한 PCell에서 sl-V2X-ConfigCommon을 포함하는 시스템 정보를 방송하지 않을 경우(if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting systm information including sl-V2X-ConfigCommon)

-After the last transmission of the SidelinkUEInformation message, if the PCell connected by the UE does not broadcast system information including sl-V2X-ConfigCommon (if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting systm information including sl-V2X-ConfigCommon)

- 가장 최근에 보낸 SidelinkUEInformation 메시지에 v2x-CommTxResourceReq를 포함하지 않은 경우 또는 가장 최근에 SidelinkUEInformation 메시지를 전송한 후에 v2x-CommTxResourceReq에 포함되어 있는 정보가 변경된 경우(if the last transmission of the SidelinkUEInformation message did not include v2x-CommTxResourceReq; or if the information carried by the v2x-CommTxResourceReq on has changed since the last transmission of the SidelinkUEInformation message)

-If v2x-CommTxResourceReq is not included in the most recently sent SidelinkUEInformation message, or if the information included in v2x-CommTxResourceReq has changed after the most recently sent SidelinkUEInformation message (if the last transmission of the SidelinkUEInformation message did not include v2x -CommTxResourceReq; or if the information carried by the v2x-CommTxResourceReq on has changed since the last transmission of the SidelinkUEInformation message)

In step 1i-25, the terminal may transmit a SidelinkUEInformation message to the base station in order to indicate a V2X sidelink communication transmission resource required for the terminal when any one of the conditions described in step 1i-20 is satisfied. Specifically, the terminal may transmit a SidelinkUEInformation message to the base station through the following series of processes.

- 만약 상위 계층 장치로부터 P2X와 관련된 V2X 사이드링크 통신을 전송하라고 설정된 경우, p2x-CommTxType을 TRUE로 설정하여 SidelinkUEInformation 메시지에 포함할 수 있다.

-If a higher layer device is configured to transmit V2X sidelink communication related to P2X, p2x-CommTxType may be set to TRUE and included in the SidelinkUEInformation message.

- v2x-CommTxResourceReq를 SidelinkUEInformation 메시지에 포함할 수 있다. v2x-CommTxResourceReq의 필드들은 단말이 상위 계층으로부터 V2X 사이드링크 통신 전송하라고 설정된 각 주파수에 대해 다음의 방법으로 설정할 수 있다.

-v2x-CommTxResourceReq can be included in the SidelinkUEInformation message. The fields of v2x-CommTxResourceReq can be set in the following manner for each frequency set for the UE to transmit V2X sidelink communication from an upper layer.

■ carrierFreqCommTx에 V2X 사이드링크 통신 전송을 위한 주파수를 지시할 수 있다(set carrierFreqCommTx to indicate the frequency for V2X sidelink communication transmission). 구체적으로, carrierFreqCommTx는 다음의 형태로 구성될 수 있다.

■ CarrierFreqCommTx can indicate the frequency for V2X sidelink communication transmission (set carrierFreqCommTx to indicate the frequency for V2X sidelink communication transmission). Specifically, carrierFreqCommTx may be configured in the following form.

◆ 0 의 값은 PCell의 주파수를 의미할 수 있다(The value 0 corresponds the PCell's frequency).

◆ A value of 0 may mean the frequency of the PCell (The value 0 corresponds to the PCell's frequency).

◆ 1의 값은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 첫번째 엔트리에 있는 주파수를 의미할 수 있다(The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). 동일한 원리로, k의 값(k>1)은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 k번재 엔트리에 있는 주파수를 의미할 수 있다(The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

◆ A value of 1 may mean a frequency in the first entry in v2x-InterFreqInfoList included in SIBx (The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). According to the same principle, the value k (k>1) may mean the frequency in the kth entry in the v2x-InterFreqInfoList included in the SIBx SIBx).

■ v2x-TypeTxSync에 V2X 사이드링크 통신 전송을 위해 carrierFreqCommTx에 연관된 현재 동기 기준 타입을 설정할 수 있다(set v2x-TypeTxSync to the current synchronization reference type used on the associated carrierFreqCommTx for V2X sidelink communication transmission)

■ A current synchronization reference type associated with carrierFreqCommTx can be set for V2X sidelink communication transmission to v2x-TypeTxSync (set v2x-TypeTxSync to the current synchronization reference type used on the associated carrierFreqCommTx for V2X sidelink communication transmission)

■ 기지국에게 dedicated 자원을 할당받기 위해 V2X 사이드링크 통신 송신 Destination information을 포함할 수 있다. 일례로, 상기 destination information에는 Destination Layer 2 ID 또는 Destination Layer 2 ID에 사용되는 전송 타입(unicast, groupcast, or broadcast)가 포함될 수 있다.

■ V2X sidelink communication transmission destination information may be included in order to receive dedicated resources to the base station. For example, the destination information may include a destination layer 2 ID or a transport type (unicast, groupcast, or broadcast) used for the destination layer 2 ID.

■ carrierFreqCommTx에 지시한 주파수가 LTE V2X 사이드링크 통신을 전송하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 전송하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 전송하기 위한 주파수이면서 NR V2X 사이드링크 통신을 전송할 수 있는 주파수인 지를 나타내는 지시자 또는 정보 요소(Information Element)를 포함할 수 있다. 일례로, 2 상기 주파수가 LTE를 위한 것인 지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 건지 구별할 수 있는 2 bit를 도입할 수 있다.

■ Whether the frequency indicated in carrierFreqCommTx is a frequency for transmitting LTE V2X sidelink communication or a frequency for transmitting NR V2X sidelink communication, or is a frequency for transmitting LTE V2X sidelink communication and NR V2X sidelink communication. It may include an indicator or an information element indicating whether the frequency can be transmitted. As an example, 2 may introduce 2 bits capable of distinguishing whether the frequency is for LTE or for NR, or for both LTE and NR.

If the above-described conditional expression is not satisfied in step 1i-15, the terminal may determine whether v2x-CommTxResourceReq is included in the last or most recently sent SidelinkUEInformation message in step 1i-30. If included, in steps 1i-35, the UE does not include an indicator for the frequency(s) in v2x-CommTxResourceReq for one frequency or a plurality of frequencies that are no longer interested in V2X sidelink communication transmission SidelinkUEInformation message Can be transmitted to the base station. A frequency that is not of interest anymore may mean a frequency that is not set to transmit V2X sidelink communication from an upper layer device. In this case, according to the above description, a SidelinkUEInformation message including an indicator or information element indicating which radio access technology the one or more frequencies is for a radio access technology may be transmitted to the base station.

In step 1i-40, the terminal may receive an RRC connection reconfiguration message from the base station. The message may include V2X sidelink configuration information. As an example, the information element SL-V2X-ConfigDedicated may be included. Through this, the terminal can be provided with resource allocation mode determination and resource information, and thus can perform V2X sidelink communication with other vehicle terminals.

10A is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.

The UE in the RRC connected mode can transmit a SidelinkUEInformation message to the base station when it wants to receive V2X sidelink communication or when it wants to no longer receive V2X sidelink communication (The purpose of transmitting SidelinkUEInformation is to inform E-UTRAN or NR that the UE in RRC_CONNECTED is interested or no longer interested to receive V2X sidelink communication). When the terminal in the RRC connected mode transmits a SidelinkUEInformation message to the base station before transitioning to the RRC deactivation mode, the terminal according to various embodiments of the present disclosure transitions to the RRC deactivation mode and then transitions to the RRC connected mode again. It is proposed to transmit the SidelinkUEInformation message to the base station only when information contained in the previously sent SidelinkUEInformation message to the base station is changed or when modification is required. When the terminal transitions to the RRC deactivation mode, the parameters set from the base station are stored in the terminal deactivation AS context, so that the stored terminal deactivation AS context can be restored when transitioning from the RRC deactivation mode to the RRC connected mode. It is also possible to store the terminal deactivation AS context. Therefore, this is because the terminal does not need to unnecessarily transmit a SidelinkUEInformation message to the base station.

Referring to FIG. 10A, a terminal supporting vehicle communication in step 1j-01 may establish an RRC connection with a base station to be in an RRC connection mode (RRC_CONNECTED).

In step 1j-05, the terminal checks whether the system information is valid if sl-V2X-ConfigCommon is included in the system information broadcast from the PCell (for example, SIBy that includes V2X sidelink communication configuration information). I can. Alternatively, in steps 1j-05, the terminal may check whether system information broadcast by the PCell is valid. For example, the system information may include at least one or more of one or a plurality of SIBy including V2X sidelink communication configuration information.

In step 1j-10, the terminal may determine whether a primary frequency or one or more frequencies set to receive V2X sidelink communication from an upper layer are included in the v2x-InterFreqInfoList included in the system information. If included, the terminal may determine whether at least one of the following conditions is satisfied in step 1j-15.

- 가장 최근에 RRC 연결 모드로 천이한 후, 기지국에게 SidelinkUEInformation 메시지를 전송하지 않은 경우(if the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state)

-If the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state after the most recent transition to the RRC connection mode, the base station has not transmitted a SidelinkUEInformation message

- SidelinkUEInformation 메시지를 마지막에 전송한 이후, 상기 단말이 연결한 PCell에서 sl-V2X-ConfigCommon을 포함하는 시스템 정보를 방송하지 않을 경우(if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

-After the last transmission of the SidelinkUEInformation message, if the PCell connected by the UE does not broadcast system information including sl-V2X-ConfigCommon (if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

- 마지막에 전송한 SidelinkUEInformation 메시지에 V2X 사이드링크 통신을 수신하고자 하는 주파수 리스트(일례로, v2x-CommRxInterestedFreqList)를 포함하지 않은 경우 또는 마지막에 SidelinkUEInformation 메시지를 전송한 후에 상위 계층 장치로부터 V2X 사이드링크 통신을 수신하라고 설정된 하나 또는 복수 개의 주파수가 변경되었을 경우(if the last transmission of the SidelinkUEInformation message did not include v2x-CommRxInterestedFreqList; or if the frequency(ies) configured by upper layers to receive V2X sidelink communication on has changed since the last transmission of the SidelinkUEInformation message)

-When the lastly transmitted SidelinkUEInformation message does not include a frequency list to receive V2X sidelink communication (for example, v2x-CommRxInterestedFreqList), or receives a V2X sidelink communication from a higher layer device after transmitting a SidelinkUEInformation message at the end If the last transmission of the SidelinkUEInformation message did not include v2x-CommRxInterestedFreqList; or if the frequency(ies) configured by upper layers to receive V2X sidelink communication on has changed since the last transmission of the SidelinkUEInformation message)

In step 1j-20, when the terminal satisfies any of the above-described conditions in step 1j-15, an indicator for one frequency of interest or indicators for a plurality of frequencies of interest for V2X sidelink communication reception is stored in the v2x-CommRxInterestedFreqList. Including the SidelinkUEInformation message can be transmitted to the base station. Specifically, v2x-CommRxInterestedFreqList may be configured in the following form.

- 0의 값은 PCell의 주파수를 의미할 수 있다(The value 0 corresponds the PCell's frequency)

-A value of 0 may mean the frequency of the PCell (The value 0 corresponds to the PCell's frequency)

- 1의 값은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 첫번째 엔트리에 있는 주파수를 의미할 수 있다(The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). 동일한 원리로, k의 값(k>1)은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 k번재 엔트리에 있는 주파수를 의미할 수 있다(The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

-A value of 1 may mean a frequency in the first entry in v2x-InterFreqInfoList included in SIBx (The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). According to the same principle, the value k (k>1) may mean a frequency in the kth entry in the v2x-InterFreqInfoList included in the SIBx (The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

The terminal according to various embodiments of the present disclosure transmits a SidelinkUEInformation message including an indicator or information element (IE) indicating which radio access technology (RAT) the one or more frequencies are applied to. It is proposed to transmit to the base station.

- v2x-CommRxInterestedFreqList에 포함되어 있는 0의 값이 LTE V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 수신하기 위한 주파수이면서 NR V2X 사이드링크 통신을 수신할 수 있는 주파수인 지를 나타내는 지시자를 포함할 수 있다. 일례로, 2 상기 주파수가 LTE를 위한 것인 지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 건지 구별할 수 있는 2 bit를 도입할 수 있다.

-Whether the value of 0 included in v2x-CommRxInterestedFreqList is a frequency for receiving LTE V2X sidelink communication or a frequency for receiving NR V2X sidelink communication or a frequency for receiving LTE V2X sidelink communication while NR It may include an indicator indicating whether it is a frequency capable of receiving the V2X sidelink communication. As an example, 2 may introduce 2 bits capable of distinguishing whether the frequency is for LTE or for NR, or for both LTE and NR.

- 만약 LTE V2X 사이드링크 통신 설정 정보가 담긴 시스템 정보와 NR V2X 사이드링크 통신 설정 정보가 담긴 시스템 정보가 구별되어 기지국으로부터 방송될 경우, 상기 단말은 v2x-CommRxInterestedFreqList에 포함되어 있는 k(k>=1)의 값이 LTE V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 수신하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 수신하기 위한 주파수이면서 NR V2X 사이드링크 통신을 수신할 수 있는 주파수인 지를 나타내는 지시자를 포함할 수 있다. 일례로, k의 값이 나타내는 주파수가 LTE를 위한 것인지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 것인지 구별할 수 있는 2 bit를 도입할 수 있다.

-If system information containing LTE V2X sidelink communication configuration information and system information containing NR V2X sidelink communication configuration information are distinguished and broadcast from the base station, the terminal k (k>=1 included in v2x-CommRxInterestedFreqList) ) Is a frequency for receiving LTE V2X sidelink communication or a frequency for receiving NR V2X sidelink communication, or is a frequency for receiving LTE V2X sidelink communication while receiving NR V2X sidelink communication. It may include an indicator indicating whether the frequency is present. As an example, 2 bits can be introduced to distinguish whether the frequency indicated by the value of k is for LTE or NR, or for both LTE and NR.

If the above-described conditional expression is not satisfied in step 1j-10, in step 1j-25, the terminal may determine whether v2x-CommRxInterestedFreqList is included in the last or most recently sent SidelinkUEInformation message. In the case of including, in step 1j-30, the terminal may transmit a SidelinkUEInformation message to the base station without including an indicator for one frequency or indicators for a plurality of frequencies that are no longer interested in receiving V2X sidelink communication in v2x-CommRxInterestedFreqList. have. For example, a frequency that is no longer of interest may mean a frequency that is no longer set to receive V2X sidelink communication from an upper layer device. In this case, a SidelinkUEInformation message may be transmitted to the base station by including an indicator or information element indicating which radio access technology the one or more frequencies are for according to the above description. Thereafter, the terminal may perform steps 1j-35 shown in FIG. 10B.

10B is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.

In steps 1j-35, the terminal may receive an RRC connection reconfiguration message from the base station. The message may include V2X sidelink configuration information. As an example, the information element SL-V2X-ConfigDedicated may be included. Through this, the terminal can be provided with resource allocation mode determination and resource information, and thus can perform V2X sidelink communication with other vehicle terminals.

In step 1j-40, the terminal may transition to the RRC inactivation mode (RRC_INACTIVE) by receiving an RRC connection release message including reservation configuration information from the base station.

In steps 1j-45, the UE may transition to the RRC connection mode by performing an RRC connection resumption procedure with the base station.

In step 1j-50, if sl-V2X-ConfigCommon is included in the system information broadcast from the PCell (for example, SIBy including V2X sidelink communication configuration information), the terminal checks whether the system information is valid. I can. Alternatively, in step 1j-50, the terminal may check whether system information broadcast by the PCell (for example, one or more SIBys including V2X sidelink communication configuration information) is valid.

In steps 1j-55, the terminal may determine whether a primary frequency or one or more frequencies set to receive V2X sidelink communication from an upper layer are included in the v2x-InterFreqInfoList included in the system information. If included, in step 1j-60, the terminal may determine whether the v2x-CommRxInterestedFreqList included in the last SidelinkUEInformation message is different from the v2x-CommRxInterestedFreqList included in the current SidelinkUEInformation message (1j-60). In other cases, the terminal may transmit SidelinkUEInformation to the base station in steps 1j-65. The method for the UE to transmit the SidelinkUEInformation message to the base station is the same as the aforementioned method. In the same case, the terminal may not transmit a SidelinkUEInformation message to the base station (1j-70).

If the above-described conditional expression is not satisfied in steps 1j-55, the terminal may determine whether the v2x-CommRxInterestedFreqList is included in the last or most recently sent SidelinkUEInformation message (1j-75). And when the corresponding v2-CommRxInterestedFreqList is different from the v2x-CommRxInterestedFreqList that the current terminal is interested in (1j-75), the terminal may transmit a SidelinkUEInformation message to the base station in steps 1j-80. The method for the UE to transmit the SidelinkUEInformation message to the base station is the same as the aforementioned method. Otherwise, the terminal may not transmit a SidelinkUEInformation message to the base station (1j-85).

11A is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.

The UE in the RRC connected mode may transmit a SidelinkUEInformation message to the base station when requesting transmission resources from the base station for V2X sidelink communication or releasing transmission resources (The purpose of transmitting SidelinkUEInformation is to inform E-UTRAN or NR that the UE in RRC_CONNECTED is to request assignment or release of transmission resources for V2X sidelink communication). When the terminal in the RRC connected mode transmits a SidelinkUEInformation message to the base station before transitioning to the RRC deactivation mode, the terminal according to various embodiments of the present disclosure transitions to the RRC deactivation mode and then transitions to the RRC connected mode again. It is proposed to transmit the SidelinkUEInformation message to the base station only when information contained in the previously sent SidelinkUEInformation message to the base station is changed or when modification is required. When the terminal transitions to the RRC deactivation mode, the parameters set from the base station are stored in the terminal deactivation AS context, so that the stored terminal deactivation AS context can be restored when transitioning from the RRC deactivation mode to the RRC connected mode. It is also possible to store the terminal deactivation AS context. Therefore, this is because the terminal does not need to unnecessarily transmit a SidelinkUEInformation message to the base station.

Referring to FIG. 11A, a terminal supporting vehicle communication in step 1k-01 may establish an RRC connection with a base station to be in an RRC connection mode (RRC_CONNECTED).

In step 1k-05, the terminal checks whether the system information is valid if sl-V2X-ConfigCommon is included in the system information broadcasted from the PCell (for example, SIBy including V2X sidelink communication configuration information). I can. Alternatively, in steps 1k-05, the terminal may check whether the system information broadcast by the PCell (for example, one or more SIBy including V2X sidelink communication configuration information) is valid.

In step 1k-10, the UE may determine whether a primary frequency or one or more frequencies set to transmit V2X sidelink communication from an upper layer are included in the v2x-InterFreqInfoList included in the system information. If included, in step 1k-15, the terminal may determine whether at least one of the following conditions is satisfied.

- 가장 최근에 RRC 연결 모드로 천이한 후, 기지국에게 SidelinkUEInformation 메시지를 전송하지 않은 경우(if the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state)

-If the UE did not transmit a SidelinkUEInformation message since last entering RRC_CONNECTED state after the most recent transition to the RRC connection mode, the base station has not transmitted a SidelinkUEInformation message

- SidelinkUEInformation 메시지를 마지막에 전송한 이후, 상기 단말이 연결한 PCell에서 sl-V2X-ConfigCommon을 포함하는 시스템 정보를 방송하지 않을 경우(if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

-After the last transmission of the SidelinkUEInformation message, if the PCell connected by the UE does not broadcast system information including sl-V2X-ConfigCommon (if since the last time the UE transmitted a SidelinkUEInformation message the UE connected to a PCell not broadcasting system information including sl-V2X-ConfigCommon)

- 가장 최근에 보낸 SidelinkUEInformation 메시지에 v2x-CommTxResourceReq를 포함하지 않은 경우 또는 가장 최근에 SidelinkUEInformation 메시지를 전송한 후에 v2x-CommTxResourceReq에 포함되어 있는 정보가 변경된 경우(if the last transmission of the SidelinkUEInformation message did not include v2x-CommTxResourceReq; or if the information carried by the v2x-CommTxResourceReq on has changed since the last transmission of the SidelinkUEInformation message)

-If v2x-CommTxResourceReq is not included in the most recently sent SidelinkUEInformation message, or if the information included in v2x-CommTxResourceReq has changed after the most recently sent SidelinkUEInformation message (if the last transmission of the SidelinkUEInformation message did not include v2x -CommTxResourceReq; or if the information carried by the v2x-CommTxResourceReq on has changed since the last transmission of the SidelinkUEInformation message)

In step 1k-20, when the terminal satisfies any of the above-described conditions in step 1k-15, the terminal may transmit a SidelinkUEInformation message to the base station to indicate the required V2X sidelink communication transmission resource to the terminal.

Specifically, the terminal may transmit a SidelinkUEInformation message to the base station through the following series of processes.

- 만약 상위 계층 장치로부터 P2X와 관련된 V2X 사이드링크 통신을 전송하라고 설정된 경우, p2x-CommTxType을 TRUE로 설정하여 SidelinkUEInformation 메시지에 포함할 수 있다.

-If a higher layer device is configured to transmit V2X sidelink communication related to P2X, p2x-CommTxType may be set to TRUE and included in the SidelinkUEInformation message.

- v2x-CommTxResourceReq를 SidelinkUEInformation 메시지에 포함할 수 있다. v2x-CommTxResourceReq의 필드들은 단말이 상위 계층으로부터 V2X 사이드링크 통신 전송하라고 설정된 각 주파수에 대해 다음의 방법으로 설정할 수 있다.

-v2x-CommTxResourceReq can be included in the SidelinkUEInformation message. The fields of v2x-CommTxResourceReq can be set in the following manner for each frequency set for the UE to transmit V2X sidelink communication from an upper layer.

■ carrierFreqCommTx에 V2X 사이드링크 통신 전송을 위한 주파수를 지시할 수 있다(set carrierFreqCommTx to indicate the frequency for V2X sidelink communication transmission). 구체적으로, carrierFreqCommTx는 다음의 형태로 구성될 수 있다.

■ CarrierFreqCommTx can indicate the frequency for V2X sidelink communication transmission (set carrierFreqCommTx to indicate the frequency for V2X sidelink communication transmission). Specifically, carrierFreqCommTx may be configured in the following form.

◆ 0 의 값은 PCell의 주파수를 의미할 수 있다(The value 0 corresponds the PCell's frequency).

◆ A value of 0 may mean the frequency of the PCell (The value 0 corresponds to the PCell's frequency).

◆ 1의 값은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 첫번째 엔트리에 있는 주파수를 의미할 수 있다(The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). 동일한 원리로, k의 값(k>1)은 SIBx에 포함되어 있는 v2x-InterFreqInfoList에 k번재 엔트리에 있는 주파수를 의미할 수 있다(The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

◆ A value of 1 may mean a frequency in the first entry in v2x-InterFreqInfoList included in SIBx (The value 1 corresponds to the frequency of first entry in v2x-InterFreqInfoList broadcast in SIBx). According to the same principle, the value k (k>1) may mean a frequency in the kth entry in the v2x-InterFreqInfoList included in the SIBx (The value k corresponds to the frequency of kth entry in v2x-InterFreqInfoList broadcast in SIBx).

■ v2x-TypeTxSync에 V2X 사이드링크 통신 전송을 위해 carrierFreqCommTx에 연관된 현재 동기 기준 타입을 설정할 수 있다(set v2x-TypeTxSync to the current synchronization reference type used on the associated carrierFreqCommTx for V2X sidelink communication transmission)

■ A current synchronization reference type associated with carrierFreqCommTx can be set for V2X sidelink communication transmission to v2x-TypeTxSync (set v2x-TypeTxSync to the current synchronization reference type used on the associated carrierFreqCommTx for V2X sidelink communication transmission)

■ 기지국에게 dedicated 자원을 할당받기 위해 V2X 사이드링크 통신 송신 Destination information을 포함할 수 있다. 일례로, 상기 destination information에는 Destination Layer 2 ID 또는 Destination Layer 2 ID에 사용되는 전송 타입(unicast, groupcast, or broadcast)가 포함될 수 있다.

■ V2X sidelink communication transmission destination information may be included in order to receive dedicated resources to the base station. For example, the destination information may include a destination layer 2 ID or a transport type (unicast, groupcast, or broadcast) used for the destination layer 2 ID.

■ carrierFreqCommTx에 지시한 주파수가 LTE V2X 사이드링크 통신을 전송하기 위한 주파수인 지 또는 NR V2X 사이드링크 통신을 전송하기 위한 주파수인 지 또는 LTE V2X 사이드링크 통신을 전송하기 위한 주파수이면서 NR V2X 사이드링크 통신을 전송할 수 있는 주파수인 지를 나타내는 지시자 또는 정보 요소(Information Element)를 포함할 수 있다. 일례로, 2 상기 주파수가 LTE를 위한 것인 지 또는 NR을 위한 것인 지 또는 LTE와 NR 모두를 위한 건지 구별할 수 있는 2 bit를 도입할 수 있다.

■ Whether the frequency indicated in carrierFreqCommTx is a frequency for transmitting LTE V2X sidelink communication or a frequency for transmitting NR V2X sidelink communication, or is a frequency for transmitting LTE V2X sidelink communication and NR V2X sidelink communication. It may include an indicator or an information element indicating whether the frequency can be transmitted. As an example, 2 may introduce 2 bits capable of distinguishing whether the frequency is for LTE or for NR, or for both LTE and NR.

If the above-described conditional expression is not satisfied in step 1k-10, in step 1k-25, the terminal may determine whether v2x-CommTxResourceReq is included in the last or most recently sent SidelinkUEInformation message. If included, in step 1k-30, the terminal may transmit a SidelinkUEInformation message to the base station without including an indicator for one frequency or indicators for a plurality of frequencies that are no longer interested in V2X sidelink communication transmission in v2x-CommTxResourceReq. have. For example, a frequency that is no longer of interest may mean a frequency that is no longer set to transmit V2X sidelink communication from an upper layer device. In this case, a SidelinkUEInformation message may be transmitted to the base station by including an indicator or information element indicating which radio access technology the one or more frequencies are for according to the above description. Thereafter, the terminal may perform steps 1k-35 shown in FIG. 10B.

11B is a diagram illustrating a terminal operation for transmitting a SidelinkUEInformation message to a base station after a terminal transitioning from an RRC connected mode to an RRC inactive mode transitions back to an RRC connected mode according to various embodiments of the present disclosure.

In steps 1k-35, the terminal may receive an RRC connection reconfiguration message from the base station. The message may include V2X sidelink configuration information. As an example, the information element SL-V2X-ConfigDedicated may be included. Through this, the terminal can be provided with resource allocation mode determination and resource information, and thus can perform V2X sidelink communication with other vehicle terminals.

In step 1k-40, the terminal may transition to an RRC inactivation mode (RRC_INACTIVE) by receiving an RRC connection release message including reservation configuration information from the base station.

In steps 1k-45, the UE may transition to the RRC connection mode by performing an RRC connection resumption procedure with the base station.

In step 1k-50, the terminal checks whether the system information is valid if sl-V2X-ConfigCommon is included in the system information broadcast from the PCell (e.g., SIBy including V2X sidelink communication configuration information). I can. Alternatively, in step 1k-50, the terminal may check whether system information broadcast by the PCell (for example, one or more SIBys including V2X sidelink communication configuration information) is valid.

In steps 1k-55, the UE may determine whether a primary frequency or one or more frequencies set to transmit V2X sidelink communication from an upper layer are included in the v2x-InterFreqInfoList included in the system information. If included, in step 1k-60, the terminal may determine whether the v2x-CommTxResourceReq included in the last SidelinkUEInformation message is different from the v2x-CommTxResourceReq included in the current SidelinkUEInformation message (1k-60). If different (1k-60), in steps 1k-65, the terminal may transmit SidelinkUEInformation to the base station. The method for the UE to transmit the SidelinkUEInformation message to the base station is the same as the aforementioned method. In the same case (1k-60), the terminal may not transmit a SidelinkUEInformation message to the base station (1k-70).

If the above-described conditional expression is not satisfied in steps 1k-55, the terminal may determine whether v2x-CommTxResourceReq is included in the last or most recently sent SidelinkUEInformation message (1k-75). And if the corresponding v2x-CommTxResourceReq is different from the v2x-CommTxResourceReq that the current terminal is interested in (1k-75), the terminal may transmit a SidelinkUEInformation message to the base station in steps 1k-80. The method for the UE to transmit the SidelinkUEInformation message to the base station is the same as the aforementioned method. In the same case (1k-75), the terminal may not transmit a SidelinkUEInformation message to the base station (1k-85).

12 is a diagram illustrating a structure of a terminal according to various embodiments of the present disclosure.

Referring to FIG. 12, the terminal includes a radio frequency (RF) processing unit 1l-10, a baseband processing unit 1l-20, a storage unit 1l-30, and a control unit 1l-40. Can include.

The RF processing unit 1l-10 according to various embodiments of the present disclosure may perform a function of transmitting and receiving a signal through a wireless channel such as band conversion and amplification of a signal. That is, the RF processing unit 1l-10 up-converts the baseband signal provided from the baseband processing unit 1l-20 to an RF band signal, and then transmits it through the antenna, and transmits the RF band signal received through the antenna to the baseband signal. Can be down-converted to a signal. For example, the RF processing unit 1l-10 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. have.

In FIG. 12, only one antenna is shown, but the terminal may include a plurality of antennas.

In addition, the RF processing unit 1l-10 may include a plurality of RF chains. Further, the RF processing unit 1l-10 may perform beamforming. For beamforming, the RF processing unit 1l-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processing unit 11-10 may perform multiple-input multiple-output (MIMO), and may receive multiple layers when performing a MIMO operation. The RF processing unit 1l-10 performs reception beam sweeping by appropriately setting a plurality of antennas or antenna elements under the control of the control unit 1l-40, or the direction and beam of the reception beam so that the reception beam cooperates with the transmission beam. You can adjust the width.

The baseband processing unit 1l-20 may perform a function of converting between a baseband signal and a bit stream according to a physical layer standard of a system. For example, when transmitting data, the baseband processing unit 11-20 may generate complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit 1l-20 may restore a received bit stream through demodulation and decoding of the baseband signal provided from the RF processing unit 1l-10. For example, in the case of the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit 11-20 generates complex symbols by encoding and modulating a transmission bit stream, and mapping the complex symbols to subcarriers. Thereafter, OFDM symbols may be configured through an inverse fast Fourier transform (IFFT) operation and a cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit 11-20 divides the baseband signal provided from the RF processing unit 11-10 in units of OFDM symbols, and is mapped to subcarriers through a fast Fourier transform (FFT) operation. After restoring the signals, the received bit stream may be restored through demodulation and decoding.

The baseband processing unit 11-20 and the RF processing unit 11-10 may transmit and receive signals as described above. Accordingly, the baseband processing unit 11-20 and the RF processing unit 11-10 may be referred to as a transmission unit, a reception unit, a transmission/reception unit, or a communication unit. Further, at least one of the baseband processing unit 11-20 and the RF processing unit 11-10 may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processing unit 1l-20 and the RF processing unit 11-10 may include different communication modules to process signals of different frequency bands. For example, different radio access technologies may include an LTE network, an NR network, and the like. In addition, different frequency bands may include a super high frequency (SHF) (eg, 2.2gHz, 2ghz) band, and a millimeter wave (eg, 60GHz) band.

The storage unit 1l-30 may store data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 1l-30 may provide stored data at the request of the control unit 1l-40.

The controller 1l-40 may control overall operations of the terminal. For example, the control unit 1l-40 may transmit and receive signals through the baseband processing unit 1l-20 and the RF processing unit 1l-10. In addition, the control unit 1l-40 can write and read data in the storage unit 1l-40. To this end, the control unit 1l-40 may include at least one processor. For example, the control unit 1l-40 may include a communication processor (CP) that controls communication and an application processor (AP) that controls an upper layer such as an application program. For example, the controller 1l-40 may control a signal flow between blocks to perform an operation according to the above-described flowchart.

13 illustrates the structure of a base station according to various embodiments of the present disclosure.

A base station according to an embodiment of the present disclosure may include one or more transmission reception points (TRP).

13, a base station according to various embodiments of the present disclosure includes an RF processing unit (1m-10), a baseband processing unit (1m-20), a backhaul communication unit (1m-30), a storage unit (1m-40), and a control unit. (1m-50) may be included.

The RF processing unit 1m-10 may perform functions for transmitting and receiving signals through a wireless channel, such as band conversion and amplification of signals. That is, the RF processing unit (1m-10) up-converts the baseband signal provided from the baseband processing unit (1m-20) to an RF band signal and then transmits it through the antenna, and transmits the RF band signal received through the antenna to the baseband signal. Can be downconverted to a signal. For example, the RF processing unit 1m-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like.

In FIG. 13, only one antenna is shown, but the base station may include a plurality of antennas.

In addition, the RF processing unit 1m-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1m-10 may perform beamforming. For beamforming, the RF processing unit 1m-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit 1m-10 may perform a downlink MIMO operation by transmitting one or more layers.

The baseband processing unit 1m-20 may perform a function of converting between a baseband signal and a bit string according to a physical layer standard of the first wireless access technology. For example, when transmitting data, the baseband processing unit 1m-20 may generate complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processing unit 1m-20 may restore a received bit stream through demodulation and decoding of the baseband signal provided from the RF processing unit 1m-10. For example, in the case of the OFDM scheme, when transmitting data, the baseband processing unit 1m-20 generates complex symbols by encoding and modulating a transmission bit stream, mapping the complex symbols to subcarriers, and then calculating IFFT and OFDM symbols can be configured through CP insertion. In addition, when receiving data, the baseband processing unit 1m-20 divides the baseband signal provided from the RF processing unit 1m-10 in units of OFDM symbols, and restores the signals mapped to the subcarriers through FFT operation. , Demodulation and decoding, the received bit stream can be restored. The baseband processing unit 1m-20 and the RF processing unit 1m-10 may transmit and receive signals as described above.

Accordingly, the baseband processing unit 1m-20 and the RF processing unit 1m-10 may be referred to as a transmission unit, a reception unit, a transmission/reception unit, a communication unit, or a wireless communication unit.

The communication unit 1m-30 may provide an interface for performing communication with other nodes in the network. That is, the communication unit (1m-30) converts a bit stream transmitted from the main station to another node, for example, an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from another node into a bit stream. can do.

The storage unit 1m-40 may store data such as a basic program, an application program, and setting information for the operation of the main station. In particular, the storage unit 1m-40 may store information on bearers allocated to the connected terminal and measurement results reported from the connected terminal. In addition, the storage unit 1m-40 may store information that is a criterion for determining whether to provide multiple connections to the terminal or to stop. Also, the storage unit 1m-40 may provide stored data according to a request of the control unit 1m-50.

The controller 1m-50 may control overall operations of the main station. For example, the control unit 1m-50 may transmit and receive signals through the baseband processing unit 1m-20 and the RF processing unit 1m-10 or through the communication unit 1m-30. Also, the control unit 1m-50 may write and read data in the storage unit 1m-40. To this end, the control unit 1m-50 may include at least one processor. For example, the control unit 1m-50 may control a signal flow between blocks to perform an operation according to the flow chart described above.

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. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types 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 Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or 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 specific embodiments of the present disclosure described above, the constituent elements included in the invention are expressed in the singular or plural according to the presented specific embodiment. However, the singular or plural expression is selected appropriately for the situation presented for convenience of explanation, 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 defined, and should be determined by the scope of the claims and equivalents as well as the scope 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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