KR20200101294A - Method and apparatus for user equipment identification to transfer messages in telecommunication system - Google Patents

Abstract

The present disclosure relates to a method and a device for identifying a terminal for message transmission in a mobile communication system. According to an embodiment of the present disclosure, a method for operating a terminal in a mobile communication system comprises the steps of: receiving policy information for V2X communication over direct communication between UEs, from a policy control function (PCF); providing an application message to be transmitted through V2X communication in an application layer and a message type of the application message; mapping the message type to an address of an application server on the basis of the policy information when the application message is transmitted by V2X communication over network; and transmitting the application message to the address of the application server.

Description

Terminal identification method and apparatus for message transmission in a mobile communication system {METHOD AND APPARATUS FOR USER EQUIPMENT IDENTIFICATION TO TRANSFER MESSAGES IN TELECOMMUNICATION SYSTEM}

The present disclosure relates to a terminal identification method and apparatus for message transmission in a mobile communication system.

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, such as the 60 Giga (60 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

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

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) 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, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied.

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

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

V2X (Vehicle to Everything) is a general term that refers to all types of communication methods applicable to road vehicles, and in combination with the development of wireless communication technology, various additional services in addition to the initial safety use cases are becoming possible.

As a V2X service providing technology, WAVE (Wireless Access in Vehicular Environments) standards based on IEEE 802.11p and IEEE P1609 have been standardized. However, WAVE, which is a type of Dedicated Short Range Communication (DSRC) technology, has a limitation in that the distance of communication between the vehicle and the vehicle is limited.

To overcome this limitation, a cellular-based V2X technology standard is in progress in 3GPP. In Release 14/Release 15, the LTE system-based EPS (Evolved Packet System) V2X standard was completed, and in Release 16, the NR system-based 5GS (5th Generation System) V2X standard is in progress.

According to an embodiment of the present disclosure, a method and apparatus for identifying a terminal for message transmission in a mobile communication system may be provided.

A method of operating a terminal in a mobile communication system according to an embodiment of the present disclosure includes receiving policy information for V2X communication over direct communication between UEs from a Policy Control Function (PCF), an application layer ) Providing an application message to be transmitted through V2X communication and a message type of the application message, and when transmitting the application message through V2X communication over network, the message type based on the policy information And mapping the address of the application server to the application server, and transmitting the application message to the address of the application server.

In one embodiment, the policy information includes a mapping relationship between the message type and a destination address for transmitting the application message, and the destination address for transmitting the application message may include the address of the application server. have.

In one embodiment, the address of the application server may include a uniform resource locator (URL) of the application server.

In one embodiment, when the application layer provides an indicator indicating broadcast, further comprising the step of setting a destination address for transmitting the application message as L2 ID (layer2 identification), based on the policy information The mapping of the message type and the address of the application server may include changing the destination address to the address of the application server according to the message type based on the policy information.

In one embodiment, when the application layer provides an indicator indicating unicast or group cast, converting an application identifier of a destination terminal for transmitting the application message into an L2 ID, and transmitting the application message The step of setting a destination address to the L2 ID, and mapping the message type and the address of the application server based on the policy information may include: the destination address according to the message type, based on the policy information. It may include the step of changing to the address of the application server.

In one embodiment, the application message includes a message determined to be transmitted by the application layer through V2X communication using direct communication between terminals, and transmitting the application message through V2X communication through the network according to a preset criterion. It may further include determining that it is.

In an embodiment, it may further include requesting the policy information through an access and mobility management function (AMF) and receiving updated policy information from the AMF.

A terminal of a mobile communication system according to an embodiment of the present disclosure includes a communication unit, at least one memory including an instruction, and V2X communication from a Policy Control Function (PCF) by executing the instruction. Receives policy information for, provides an application message to be transmitted through V2X communication in an application layer and a message type of the application message, and transmits the application message through V2X communication over network In this case, it may include at least one processor that maps the message type and the address of the application server based on the policy information, and controls to transmit the application message to the address of the application server.

In one embodiment, the policy information includes a mapping relationship between the message type and a destination address for transmitting the application message, and the destination address for transmitting the application message may include the address of the application server. have.

In one embodiment, the address of the application server may include a uniform resource locator (URL) of the application server.

In one embodiment, the at least one processor, when the application layer provides an indicator indicating broadcast, sets the destination address for transmitting the application message as L2 ID (layer2 identification), and the policy information Based on the message type, the destination address may be controlled to be changed to the address of the application server.

In one embodiment, the at least one processor, when the application layer provides an indicator indicating unicast or group cast, converts the application identifier of the destination terminal for transmitting the application message to an L2 ID, and the A destination address for transmitting an application message may be set as the L2 ID, and control may be performed to change the destination address to an address of the application server according to the message type based on the policy information.

In an embodiment, the application message includes a message determined to be transmitted by the application layer through V2X communication using direct communication between terminals, and the at least one processor transmits the application message to the network according to a preset criterion. It can be determined to transmit through V2X communication through.

In an embodiment, the at least one processor may request the policy information through an access and mobility management function (AMF) and control to receive updated policy information from the AMF.

According to an embodiment of the present disclosure, a method and apparatus for identifying a terminal for message transmission in a mobile communication system may be provided.

1 illustrates a configuration of a vehicle communication system according to an embodiment of the present disclosure.
2 is a mobile communication system architecture according to an embodiment of the present disclosure and
It is a block diagram showing a connection relationship between a mobile communication system and a terminal.
3 illustrates a protocol stack of a terminal according to an embodiment of the present disclosure.
4 illustrates a procedure for transmitting data from a terminal to an application server according to an embodiment of the present disclosure.
5 illustrates a network-based terminal provisioning procedure according to an embodiment of the present disclosure.
6 illustrates a terminal-based terminal provisioning procedure according to an embodiment of the present disclosure.
7 illustrates a procedure for a terminal to obtain communication information from a base station according to an embodiment of the present disclosure.
8 is a diagram illustrating a configuration of a terminal according to an embodiment of the present disclosure.
9 is a diagram illustrating a configuration of a network entity according to an embodiment of the present disclosure.

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. 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 the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to the embodiments described below 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 present disclosure complete, and those skilled in the art to which the present disclosure pertains. It is provided to fully inform the scope of the invention to the person, 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.

At this time, 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 the present embodiment refers to software or hardware components such as FPGA or ASIC, and'~ unit' performs certain roles. 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.

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 convenience of description below, the present disclosure uses terms and names defined in standards for 5G, New Radio (NR), and Long Term Evolution (LTE) systems. However, the present disclosure is not limited by the terms and names, and may be equally applied to systems conforming to other standards.

In describing the embodiments of the present disclosure in detail, the communication standard defined by the 3GPP will be the main target, but the main subject of the present disclosure is not significantly departing from the scope of the present disclosure to other communication systems having a similar technical background. It can be applied with slight modifications in the range of, and this will be possible at the judgment of a person skilled in the technical field of the present disclosure.

In describing the embodiments of the present disclosure in detail, the vehicle communication service will be the main target, but the main subject of the present disclosure is that the scope of the present disclosure is not significantly departed from other services provided in 5G, NR, or LTE networks. It can be applied with slight modifications in the range, and this will be possible at the judgment of a person skilled in the technical field of the present disclosure.

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

Among them, URLLC service is a service newly considered by 5G or NR system, unlike the existing 4G system, and has ultra-high reliability (e.g., packet error rate about 10-5) and low latency (e.g. For example, about 0.5msec) condition is required. In order to satisfy such strict requirements, the URLLC service may need to apply a transmission time interval (TTI) shorter than that of the eMBB service, and various operation methods utilizing this may be considered.

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) 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, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied.

1 shows a configuration of a vehicle communication system according to an embodiment of the present disclosure.

Referring to FIG. 1, a terminal (UE, 110), for example, a vehicle terminal, communicates directly with another terminal 120, for example, another vehicle terminal (e.g., Device-to-Device, D2D, ProSe, PC5, Sidelink communication, 140) may be used, or network communication 150 and 160 through the mobile communication system 130 may be used. In the case of direct communication, message transmission and reception between the terminal 110 and the other terminal 120 may be performed through the PC5 link. In the case of network communication, a message sent from the transmitting vehicle terminal to the receiving vehicle terminal may be transmitted to the network through a Uu link and then transmitted to the receiving vehicle terminal through the Uu link.

2 is a block diagram illustrating a mobile communication system architecture and a connection relationship between the mobile communication system and a terminal according to an embodiment of the present disclosure.

Referring to FIG. 2, an EPS (Evolved Packet System)-based mobile communication system may include an Evolved Packet Core (EPC) core network 210 and a Long Term Evolution (LTE) base station 220 and 223. A 5th Generation System (5GS)-based mobile communication system may include a 5th Generation Core (5GC) core network 215 and a New Radio (NR) base station 223 and 226. The 5G core network 215 may be composed of one or more network entities. Network entities constituting the 5G core network are Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), User Data Management (UDM), Policy Control Function (PCF), and NEF defined by 3GPP. (Network Exposure Function), AF (Application Functions), etc. may be included. Hereinafter, a base station and a radio access network (RAN) may be mixed and used. Hereinafter, the LTE base station, the 4G base station, and the eNB may be mixed and used. Hereinafter, the NR base station, the 5G base station, and the gNB may be used interchangeably. Hereinafter, an application server and an application function (AF) may be mixed and used.

The terminals 230 and 233 may access the EPC core network 210 through the LTE base stations 220 and 223 to receive a service from the application server 240. The terminals 233 and 236 may access the 5G core network 215 through the NR base stations 223 and 226 to receive a service from the application server 240.

The terminals 230, 233, and 236 can perform direct communication (Device-to-Device, D2D, ProSe, PC5, Sidelink communication, etc.) between the terminal and the terminal without going through the mobile communication systems 210 and 215.

3 illustrates a protocol stack of a terminal according to an embodiment of the present disclosure.

Referring to Figure 3, the terminal 310 is an application layer (Application layer, 320), SE layer (Service Enabling layer, 330), AS layer (Access Stratum layer, 353, 363), PHY layer (PHYsical layer, 356, 366). The SE layer is an intermediate layer for performing the operation of the application layer, and can provide specialized functions for each application or service. One SE layer can support multiple application layers. Alternatively, a specialized SE layer for each application layer can be defined. For example, for the V2X application layer (V2X application layer) operation for V2X service provision, the SE layer may be defined as a V2X layer (V2X layer). The communication modem can be composed of an AS layer and a PHY layer. The terminal 310 according to an embodiment of the present disclosure may include an LTE modem 350 and an NR modem 360. The LTE modem 350 may be composed of an AS layer 353 and a PHY layer 356 for LTE communication. The NR modem 360 may include an AS layer 363 and a PHY layer 366 for NR communication.

The terminal 310 according to an embodiment of the present disclosure may manage an application identifier used in an application program operating in the application layer 320. The terminal 310 may drive a plurality of application programs and manage a plurality of application identifiers. The terminal 310 may manage the terminal's own L2 ID (Layer 2 Identification) used in direct communication. The terminal 310 may manage a plurality of terminal L2 IDs. The terminal may manage the L2 ID mapped for each application identifier. [Table 1] shows an example of L2 ID information mapped to an application identifier managed by the terminal 310. The application identifier and L2 ID of [Table 1] may include information used as an ID indicating the terminal itself.

[Table 1] Example of terminal application identifier and L2 ID information

The terminal may provide mapping information between the application identifier and the L2 ID of the terminal managed by the terminal shown in [Table 1] to the application server.

4 illustrates a procedure for transmitting data from a terminal to an application server according to an embodiment of the present disclosure.

Referring to FIG. 4, the terminal 410 may provide the application server 440 with the mapping information shown in [Table 1]. The terminal 410 that has completed the registration procedure by accessing the mobile communication network may start a PDU session (step 1). The terminal 410 may transmit uplink data including the mapping information shown in [Table 1] (Step 2). The uplink data transmitted from the terminal 410 may be transmitted to the application server 440 (step 3). The application server 440 may store the application identifier and L2 ID information of the terminal received from the terminal 410.

The terminal 410 may change the L2 ID mapped to the application identifier. The terminal 410 may change the application identifier used in the application program. When the application identifier of the terminal and the L2 ID mapping information are changed in this way, the terminal 410 may perform the procedure of FIG. 4 to update the changed information to the application server 440.

The application server 440 may receive an application identifier and L2 ID mapping information of a terminal managed by each terminal from a plurality of terminals according to the procedure shown in FIG. 4. The application server 440 may store and manage the application identifier and L2 ID information of the terminal received from each terminal. [Table 5] described below shows an example of L2 ID information for each application identifier of the terminal managed by the application server 440.

The application layer 320 of the terminals 110 and 310 to transmit the message may generate an application message (hereinafter, referred to as “message”) and provide it to the SE layer 330. In this case, the application layer 320 may provide the SE layer 330 with various information related to message transmission along with the application message. Such various information may include a'message type' value indicating the type of message. In the case of vehicle communication, the message type may be PSID, ITS-AID, or the like. Various information may include a message transmission method indication (eg, broadcast, groupcast, unicast, etc.). When groupcast or unicast is included as the message transmission method indicator, the application identifier of the destination terminal to which the message is to be transmitted may be included.

The SE layer 330 may determine a transmission path of a message delivered from the application layer 320. For example, the SE layer 330 of the terminals 110 and 310 may send a message to the counterpart terminal 120 using the direct communication 140. Alternatively, the SE layer 330 of the terminals 110 and 310 may send a message to the counterpart terminal 120 using network communication 150 and 160. There may be various methods for the SE layer 330 to determine a message transmission path.

The SE layer 330 may receive a report on whether direct communication is currently possible from the AS layers 353 and 363. For example, the AS layer 353 may report to the SE layer 330 whether the current LTE direct communication is possible. The AS layer 363 may report to the SE layer 330 whether the current NR direct communication is possible. The SE layer 330 may determine a transmission path based on whether direct communication is currently possible. If LTE direct communication is currently not possible and NR direct communication is possible, the SE layer 330 may determine to transmit a message through NR direct communication. Alternatively, if LTE direct communication is currently possible and NR direct communication is not possible, the SE layer 330 may determine to transmit a message through LTE direct communication. Alternatively, if the current LTE direct communication and NR direct communication are not possible, the SE layer 330 may determine to transmit a message through network communication. It will be described with reference to FIG. 7.

7 illustrates a procedure for a terminal to obtain communication information from a base station according to an embodiment of the present disclosure.

Referring to FIG. 7, the terminal 710 may obtain information on whether broadcast or multicast communication is possible through a network (Uu) in an area where the terminal is currently located from the base station 720 (730 ). The SE layer 330 of the terminal 710 may determine a transmission path of the message transmitted from the application layer 320 based on the information received from the base station (740). For example, when broadcast or multicast communication over a network (Uu) in the current area is not possible, the SE layer 330 may determine to transmit a message through LTE direct communication or NR direct communication. Alternatively, if broadcast or multicast communication through a network (Uu) is possible in the current area, the SE layer 330 may determine to transmit a message through network communication.

The SE layer 330 may store and manage direct communication radio access technology (RAT) information to transmit messages for each message type. [Table 2] below shows an example of direct communication radio access technology information to transmit messages for each message type managed by the SE layer 330.

[Table 2] Examples of direct communication radio access technology (RAT type) information to transmit messages by message type

The SE layer 330 may determine the RAT type to transmit the message using the information in [Table 2] according to the message type received from the application layer 320. For example, if the message type received from the application layer 320 is PSID 1, the SE layer 330 may determine to transmit the message through LTE direct communication using [Table 2]. When the message type received from the application layer 320 is PSID 2, the SE layer 330 may determine to transmit the message through NR direct communication using [Table 2]. When the message type received from the application layer 320 is ITS-AID 1, the SE layer 330 may determine to transmit the message by overlapping LTE direct communication and NR direct communication using Table 2.

The SE layer 330 of the terminals 110 and 310 may determine the transmission path of the message in consideration of the distance to the counterpart terminal 120 to receive the message. When the application layer 320 generates an application message (hereinafter referred to as'message') and provides the application message and message type to the SE layer 330, the communication range value of the corresponding message is provided together. can do. The SE layer 330 may determine to transmit a message through LTE or NR direct communication when the communication range received from the application layer 320 is available through direct communication. The SE layer 330 may determine to transmit a message through network communication when the communication range received from the application layer 320 is farther than the direct communication range.

The SE layer 330 according to an embodiment of the present disclosure may finally determine a message transmission method (eg, LTE direct communication, NR direct communication, WiFi direct communication, network communication, etc.) by a combination of the above-described various methods. .

The SE layer 330 may store and manage destination information to transmit messages for each message type. [Table 3] below shows an example of destination information to be transmitted for each message type managed by the SE layer 330.

[Table 3] Example of destination information for sending messages by message type

When the application layer 320 indicates broadcast as a message transmission method indicator, the SE layer 330 uses the information in [Table 3] according to the message type received from the application layer 320 to transmit the message to the destination address. Can be determined. For example, when the message type received from the application layer 320 is PSID 2, the SE layer 330 uses the information in Table 3 to determine the L2 header (eg, L2 header, ProSe message header) of the message. Can be set. The L2 header of the message may consist of the L2 source address and the L2 destination address of the message. The SE layer 330 of the terminals 110 and 310 sets their own L2 address as the L2 source address of the message, and the L2 destination address of the message is shown in Table 3. It can be set to L2ID_2 using information.

When the application layer 320 indicates unicast or groupcast as a message transmission method indicator, the SE layer 330 is the application identifier of the destination terminal to which the message received from the application layer 320 is to be delivered (for example, USER_APP_Id 6) can be converted into an L2 ID (eg, L2ID_e). The SE layer 330 of the terminals 110 and 310 sets their own L2 address as the L2 source address of the message, and L2 converted to the L2 destination address of the message. It can be set by ID (for example, L2ID_e).

When it is determined to send the above-described message through LTE direct communication, the SE layer 330 transmits the message received from the application layer 320 and the message type and the L2 header set by the SE layer through the direct communication interface of the LTE modem. It can be delivered to the layer 353. When it is decided to send the message through NR direct communication, the SE layer 330 transmits the message received from the application layer 320, the message type, and the L2 header set by the SE layer through the direct communication interface of the NR modem. (363) can be delivered.

When it is determined to send the above-described message through network communication, the SE layer 330 may set AS_URL_2 as the destination address of the application server of the message using the information in [Table 3]. The information in [Table 3] may include a cast type. That is, the terminal can manage the information in [Table 3] for each cast type. In this case, the destination address of the application server may be set to a different address according to the cast type (eg, unicast, groupcast, broadcast, etc.). The SE layer 330 transmits the message received from the application layer 320, the L2 header set by the SE layer, and the application server destination address of the message through the network communication (Uu) interface of an LTE modem or an NR modem. 363).

According to another embodiment, the terminal may determine a transmission path for each cast type. For example, the terminal may use direct communication in the case of a broadcast message, and may use network communication in the case of a unicast message. Of course, it is not limited to the above example.

Referring to FIG. 4, the message is an application server via a terminal (110, 410), a base station 420, and a UPF of a 5G core network (e.g., 430 when a message is transmitted through NR network communication). It may be delivered to the application server 440 indicated by the destination address AS_URL_2. The uplink data transmitted by the terminals 110 and 410 include a message, an L2 header of the message (including the L2 source address and L2 destination address), and the current location of the transmitting terminals 110 and 410 (e.g., latitude/longitude, cell Information (Cell Id, a list of Cell Ids), Registration Area, a list of Registration Area, PLMN ID, a list of PLMN IDs, etc.), the application identifier of the transmitting terminal (110, 410), the terminal to receive the message It may include an application identifier.

The application server that has received the message from the terminal can process the received message.

The application server may determine whether the receiving host of the message is the application server itself or another terminal by looking at the application server destination address of the received message. For example, the same application server may use different application server destination addresses to distinguish between a destination address in which a destination host is the application server itself and a destination address in another terminal.

When the destination address of the received message is a different terminal, the application server may determine the terminal that sent the message and the terminal that should receive the message by looking at the L2 header of the received message. [Table 4] and [Table 5] below show examples of L2 ID information for each message type managed by an application server and L2 ID information for each application identifier of a terminal.

[Table 4] Example of L2 ID information by message type

[Table 5] Example of L2 ID information for each application identifier of the terminal

Various methods can be used to determine the sending terminal of the message received by the application server.

The application server can compare the L2 source address in the L2 header of the received message with the information in [Table 5]. For example, when the L2 source address is L2ID_a, the application server may determine that the terminal transmitting the received message is UE 1 and the application identifier of the terminal is USER_APP_Id 1.

The application server may compare the application identifier of the source terminal included in the received message with the information in [Table 5]. For example, if USER_APP_Id 1 is included as the application identifier, the application server may determine that the terminal transmitting the received message is UE 1.

Various methods can be used to determine the terminal to which the application server is to deliver the received message.

The application server may compare the information in Table 4 with the L2 destination address in the L2 header of the received message. If the L2 destination address of the received message is included in the Destination L2 ID of Table 4, the application server may determine that the received message is a device-to-device (D2D) broadcast message. The application server may transmit a message received through Uu broadcast network communication to a corresponding region using the location information of the terminal that transmitted the message. For example, when the L2 destination address is L2ID_1, the application server may know that the received message is a message for a PSID 1 message type service. The application server may transmit the received message including the L2 header to an area where the terminal transmitting the message is located through broadcast network communication. The terminal receiving the message through broadcast network communication can see the destination address of the L2 header of the received message and know that the received message is a message for a PSID 1 message type service.

The application server can compare the L2 destination address in the L2 header of the received message with the information in [Table 5]. If the L2 destination address of the received message is included in the Destination L2 ID of Table 4, the application server may determine that the received message is a device-to-device (D2D) unicast message. The application server may transmit a message received through unicast network communication using the application identifier of the terminal corresponding to the Destination L2 ID as a destination. For example, if the L2 destination address is L2ID_e, the application server may determine that the terminal to which the received message is to be delivered is UE 2 and the application identifier of the terminal is USER_APP_Id 6. The application server can deliver the received message with USER_APP_Id 6 as a destination through Uu unicast network communication.

The terminals 110 and 120 according to an embodiment of the present disclosure may obtain the configuration information shown in [Table 2] and [Table 3] from the network 130.

5 illustrates a network-based terminal provisioning procedure according to an embodiment of the present disclosure.

Referring to FIG. 5, the terminal 510 according to an embodiment, for example, a vehicle terminal, may send a registration request message (step 1). The terminal may include capability information (eg, V2X capability) of the terminal in the registration request message. Upon receiving the registration request message, the base station 520 may select an AMF to transmit the registration request message (step 2). The base station 520 may transmit the registration request message received from the terminal 510 to the AMF (step 3). Upon receiving the registration request message, the AMF 530 may select the UDM 550 (step 4). The AMF 530 may acquire subscription information of the terminal from the selected UDM 550 (Step 5, Step 6). The AMF 530 may do an event subscription to the selected UDM 550 (Step 7). The AMF 530 can select the PCF 540 (step 8). When the AMF 530 selects the PCF 540, capability information of the terminal included in the registration request message may be used. For example, when the terminal 510 transmits the V2X capability, the AMF 530 may select a PCF supporting the V2X function. The AMF 530 may perform a policy association establishment with the selected PCF 540 (steps 9 and 11). The AMF 530 may request the PCF 540 for V2X policy information of the terminal (step 9). The PCF 540 may fetch the terminal's V2X policy information stored in the UDR 560 from the Unified Data Repository (UDR) 560 (step 10). The PCF 540 may provide the V2X policy information obtained from the UDR 560 to the AMF 530 (step 11). If, in the PCF 540, if the V2X policy information of the terminal has already been stored, step 10 may be omitted. V2X policy information stored in the UDR 560 or PCF 540 may include the information shown in [Table 2] and [Table 3]. The AMF 530 may return a registration response message to the registration request message received in step 3 to the terminal 510 (step 12). The registration request message may include V2X policy information returned by the AMF 530 from the PCF 540 and may be transmitted to the terminal 510. The terminal can store and use the received V2X policy information in the terminal.

The AMF 530 may deliver the V2X policy information to the terminal 510 having completed the registration procedure at any time (step 15, step 16). The DL NAS transport message transmitted by the AMF 530 to the terminal 510 may include V2X policy information (step 15). As a method for the AMF 530 to determine whether to transmit the V2X policy information to the terminal, step 15 may be performed when the valid period of the V2X policy information previously sent by the AMF has expired. Alternatively, step 15 may be performed when the version of the V2X policy information previously sent by the AMF is expired. Alternatively, when there is V2X policy information applicable to the current location (Registration Area) of the terminal, step 15 may be performed. Alternatively, when the updated V2X policy information is received from the PCF (step 14), step 15 may be performed. The PCF may receive V2X policy information update notification from the UDR and transmit the updated V2X information to the PCF (step 14).

Terminals (510, 610) that have completed the registration process may request V2X policy information at any time.

6 illustrates a terminal-based terminal provisioning procedure according to an embodiment of the present disclosure.

The terminal having completed the processes of steps 1 to 12 of FIG. 5 may request V2X policy information through the procedure shown in FIG. 6. The terminal 610 may transmit a UE policy provisioning request message to the AMF 630 (step 1). The policy information request message may include the type of policy information requested by the terminal (eg, V2X policy). The AMF 630 may request the PCF to update the policy information (Step 2). The PCF 640 may return a policy information update response message including the policy information to the AMF (Step 3). The policy information included in the PCF policy information update response message may include V2X policy information of the terminal. The AMF 630 may send a DL NAS transport message to the terminal 610 (step 4). The DL NAS transport message may include V2X policy information received from the PCF 640. The terminal can store and use the received V2X policy information in the terminal.

There may be various methods for the terminal 610 to determine a request for V2X policy information to the AMF 630 (ie, a condition in which step 1 of FIG. 6 starts). For example, when the valid period of the V2X policy information previously transmitted and stored by the terminal has expired, step 1 of FIG. 6 may be performed. Alternatively, step 1 of FIG. 6 may be performed when the version of the V2X policy information previously transmitted and stored by the terminal is expired. Alternatively, step 1 of FIG. 6 may be performed when there is no V2X policy information applicable to the current location (Registration Area) of the terminal. For example, a message of a message received from the application layer 320 corresponding to the current location of the terminal 310 in the process of the SE layer 330 of the terminal 310 processing a message transmitted from the application layer 320 If information corresponding to the type (eg, PSID or ITS-AID, etc.) does not exist in [Table 2] or [Table 3], the terminal 310 determines that there is no V2X policy information applicable at the current location and , In order to obtain the latest V2X policy information, step 1 of FIG. 6 may be performed.

8 is a diagram illustrating a configuration of a terminal according to an embodiment of the present disclosure.

As shown in FIG. 8, the terminal of the present disclosure may include a transceiver 810, a memory 820, and a processor 830. The processor 830, the transceiver 810, and the memory 820 of the terminal may operate according to the above-described communication method of the terminal. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the processor 830, the transceiver 810, and the memory 820 may be implemented in the form of a single chip. Also, the processor 830 may include at least one or more processors.

The transceiving unit 810 refers to a receiving unit of a terminal and a transmitting unit of a terminal, and may transmit and receive signals with a base station. Signals transmitted and received with the base station may include control information and data. To this end, the transceiver 810 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 810, and components of the transmission/reception unit 810 are not limited to the RF transmitter and the RF receiver.

In addition, the transmission/reception unit 810 may receive a signal through a wireless channel, output it to the processor 830, and transmit a signal output from the processor 830 through a wireless channel.

The memory 820 may store programs and data necessary for the operation of the terminal. In addition, the memory 820 may store control information or data included in a signal obtained from the terminal. The memory 820 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media.

The processor 830 may control a series of processes so that the terminal can operate according to the above-described embodiment of the present disclosure. For example, the processor 830 may receive a control signal and a data signal through the transceiver 810 and process the received control signal and data signal. In addition, the processor 830 The signal may be transmitted through the transceiver 810.

9 is a diagram illustrating a configuration of a network entity according to an embodiment of the present disclosure.

As shown in FIG. 9, the network entity of the present disclosure may include a transceiver 910, a memory 920, and a processor 930. The processor 930, the transceiver 910, and the memory 920 of the network entity may operate according to the aforementioned communication method of the network entity. However, the elements of the network entity are not limited to the above-described example. For example, the network entity may include more or fewer components than the above-described components. In addition, the processor 930, the transceiver 910, and the memory 920 may be implemented in a single chip form. Also, the processor 930 may include at least one or more processors.

The transmission/reception unit 910 refers to a reception unit of a network entity and a transmission unit of a network entity, and may transmit and receive signals with a base station. Signals transmitted and received with the base station may include control information and data. To this end, the transceiver 910 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 910, and components of the transmission/reception unit 910 are not limited to the RF transmitter and the RF receiver.

In addition, the transmission/reception unit 910 may receive a signal through a wireless channel, output it to the processor 930, and transmit a signal output from the processor 930 through a wireless channel.

The memory 920 may store programs and data required for operation of the network entity. In addition, the memory 920 may store control information or data included in a signal obtained from a network entity. The memory 920 may be formed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media.

The processor 930 may control a series of processes so that the network entity can operate according to the above-described embodiment of the present disclosure. For example, the processor 930 may receive a control signal and a data signal through the transceiver 910 and process the received control signal and data signal. In addition, the processor 930 may process the processed control signal and data. The signal may be transmitted through the transmission/reception unit 910.

The methods according to the embodiments described in the claims or 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 or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium or a computer program product 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 can be accessed through a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a communication network composed of a combination thereof. It may be stored in an (access) attachable storage device. Such a storage device may access 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, components included in the present disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

On the other hand, the embodiments disclosed in the specification and drawings are only provided specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is apparent to those of ordinary skill in the technical field to which the present disclosure belongs that other modifications are possible based on the technical idea of the present disclosure. In addition, each of the embodiments can be combined and operated as necessary. For example, portions of one embodiment of the present disclosure and another embodiment may be combined with each other. In addition, the embodiments may be implemented in other systems, for example, LTE system, 5G or NR system, and other modifications based on the technical idea of the above-described embodiment.

Claims (14)

In the method of operating a terminal in a mobile communication system,
Receiving policy information for V2X communication (V2X communication over direct communication between UEs) from a Policy Control Function (PCF);
Providing an application message to be transmitted through V2X communication and a message type of the application message in an application layer;
Mapping the message type and the address of the application server based on the policy information when transmitting the application message through V2X communication over a network; And
And transmitting the application message to the address of the application server.
The method of claim 1,
The above policy information,
Including a mapping relationship between the message type and a destination address for transmitting the application message,
The destination address for transmitting the application message,
Comprising the address of the application server.
The method of claim 2,
The address of the application server is,
A method comprising the URL (uniform resource locator) of the application server.
The method of claim 1,
When the application layer provides an indicator indicating broadcast, further comprising the step of setting a destination address for transmitting the application message as L2 ID (layer2 identification),
Mapping the message type and the address of the application server based on the policy information,
And changing the destination address to the address of the application server according to the message type, based on the policy information.
The method of claim 1,
Converting an application identifier of a destination terminal for transmitting the application message into an L2 ID when the application layer provides an indicator indicating unicast or group cast; And
Further comprising the step of setting a destination address for transmitting the application message as the L2 ID,
Mapping the message type and the address of the application server based on the policy information,
And changing the destination address to the address of the application server according to the message type, based on the policy information.
The method of claim 1,
The application message,
Includes a message determined to be transmitted through V2X communication using direct communication between terminals in the application layer,
The method further comprising the step of determining to transmit the application message through V2X communication through the network according to a preset criterion.
The method of claim 1,
Requesting the policy information through an access and mobility management function (AMF); And
The method further comprising receiving updated policy information from the AMF.
In the terminal of the mobile communication system,
Communication department;
At least one memory containing instructions; And
By executing the instruction, the policy information for V2X communication (V2X communication over direct communication between UEs) is received from the PCF (Policy Control Function), and the application message and the application message to be transmitted through V2X communication in the application layer If the message type of is provided and the application message is transmitted through V2X communication over network, the message type and the address of the application server are mapped based on the policy information, and the address of the application server And at least one processor for controlling to transmit the application message to the terminal.
The method of claim 8,
The above policy information,
Including a mapping relationship between the message type and a destination address for transmitting the application message,
The destination address for transmitting the application message,
Terminal comprising the address of the application server.
The method of claim 9,
The address of the application server is,
Terminal containing the URL (uniform resource locator) of the application server.
The method of claim 8,
The at least one or more processors,
When the application layer provides an indicator indicating broadcast, a destination address for transmitting the application message is set as L2 ID (layer2 identification), and the destination address is set according to the message type based on the policy information. Controlling to change to the address of the application server, the terminal.
The method of claim 8,
The at least one or more processors,
When the application layer provides an indicator indicating unicast or group cast, the application identifier of the destination terminal for transmitting the application message is converted into an L2 ID, and the destination address for transmitting the application message is the L2 ID. And controlling to change the destination address to the address of the application server according to the message type based on the policy information.
The method of claim 8,
The application message,
Includes a message determined to be transmitted through V2X communication using direct communication between terminals in the application layer,
The at least one or more processors,
According to a preset criterion, the terminal determines to transmit the application message through V2X communication through the network.
The method of claim 8,
The at least one or more processors,
Requesting the policy information through an access and mobility management function (AMF), and controlling to receive updated policy information from the AMF.

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